JP2003328147A - Painting pretreatment equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating pretreatment apparatus wherein the space is saved by the reduction of a treatment process, the productivity is improved and the equipment cost, the chemical cost, the management man-hour and the load of the waste water treatment are reduced. <P>SOLUTION: The coating pretreatment apparatus has a treatment vessel 1 in which a degreasing and chemical conversion liquid are filled, a 1st circulation line 11 for sucking a treating liquid in the treating vessel 1 and returning to the treatment vessel 1 and a pair of heat exchangers 501, 502 provided in parallel and selectively in the 1st circulation line and for exchanging the heat of the degreasing and chemical conversion liquid to be returned to the treatment vessel and a nitric acid pickling liquid is supplied from a nitric acid tank 519 to a flow passage 501b1 for the degreasing and chemical conversion liquid in each heat exchanger. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs pre-painting treatment from degreasing treatment to zinc phosphate chemical conversion treatment in the same step on a metal surface to which oil components such as rust preventive oil, press oil and cutting oil adhere. The present invention relates to a pretreatment device for coating used when performing.

[0002]

2. Description of the Related Art At present, zinc phosphate chemical conversion treatment is widely performed on metal surfaces plated with iron or zinc to impart rust prevention and paintability.

The general treatment steps of this type of zinc phosphate treatment are as follows: degreasing → washing → surface adjustment → chemical conversion treatment (zinc phosphate treatment) → washing → drying. The degreasing treatment, degreasing water washing, and surface adjustment are carried out in multiple steps if necessary.

By the way, in order for the zinc phosphate chemical conversion coating obtained in this chemical conversion treatment step to have excellent rust prevention and coating properties as a coating base, the coating weight is 2 to 5 g / m 2.
A uniform and dense crystal film of about ² is desirable. In order to realize such a crystal film, a degreasing process to remove oil adhering to the metal surface is essential for film deposition, and a titanium colloid-based treatment liquid is used for densifying film crystals. The surface adjustment process that was necessary was essential.

[0005]

However, when the above-mentioned zinc phosphate treatment is carried out, there are generally the following three problems.

The first problem is that the total processing steps are very long. This results in a large and large number of processing equipments, a large amount of space is required, which is expensive, and a considerable amount of time is required to pass through all the processing steps, resulting in low productivity.

The second problem is that there are many management items. For example, if the degreasing is alkaline degreasing, the alkalinity of degreasing (total alkalinity, free alkalinity) and the concentration of the surface conditioning solution (total alkalinity, titanium concentration) should be controlled when using titanium colloidal surface preparation. To
There are a wide variety of items to manage, which imposes a heavy operational burden. Moreover, since the medicine is consumed in each process, the cost burden is considerably large. The degreasing liquid is consumed by adhering to the object to be processed and carried out to the next step (water washing step), and is also consumed at the time of regular disposal and renewal. Further, the surface conditioning liquid is consumed when it is taken out or when it is renewed by discarding it. Further, since the durability of the treatment liquid is low, continuous partial renewal (auto drain) is often performed, and this is also consumed.

A third problem is that the amount of wash water discharged increases. Since a defect often occurs when the degreasing liquid is brought into the surface conditioning liquid or the zinc phosphate chemical conversion treatment liquid, a water washing process is always installed after the degreasing process.
Even after the zinc phosphate chemical conversion treatment, if the treatment liquid remains on the surface of the object to be treated, problems will occur regardless of whether it is used as a coating base or for rust prevention. Required. As described above, a large amount of wash water is discharged from the two systems after degreasing and after zinc phosphate conversion treatment, so that the burden on wastewater treatment is considerably large.

The present invention aims to provide a pretreatment apparatus for coating, which can save space, improve productivity, and significantly reduce facility costs, chemical costs, management man-hours, and wastewater treatment burden by shortening the treatment steps. To aim.

[0010]

[Means for Solving the Problems] (1) In order to achieve the above object, a treatment tank filled with a degreasing / chemical conversion treatment liquid and a degreasing / chemical conversion treatment liquid in the treatment tank are sucked into the treatment tank. A pair of heat exchangers for returning heat between the first circulation system for returning and a degreasing / chemical conversion treatment liquid which is provided in parallel and selectively in the first circulation system and is returned to the treatment tank; There is provided a coating pretreatment device including heat exchanger cleaning means for supplying a cleaning liquid to the degreasing / chemical conversion treatment liquid flow path of each heat exchanger (see claim 1).

In the above invention, the heat exchanger cleaning means is such that when one of the pair of heat exchangers is supplied with the degreasing / chemical conversion treatment liquid sucked from the processing tank, the other heat exchanger is subjected to degreasing / chemical conversion treatment. It is more preferable to supply the cleaning liquid to the liquid flow path (see claim 2).

In the present invention, a heat exchanger for adjusting the temperature of the degreasing / chemical conversion treatment liquid returned to the treatment tank to an appropriate temperature is provided in parallel and selectively in the first circulation system, so that one heat exchanger is used. It is possible to supply the cleaning liquid to the other heat exchanger while using, and clean the flow path of the degreasing / chemical conversion treatment liquid of the heat exchanger. As a result, even if the flow path of the degreasing / chemical conversion treatment liquid of the heat exchanger is set to be narrow in order to improve the heat exchange efficiency, it is possible to prevent the formation of sludge and oil components and improve the heat exchange efficiency. .

(2) In the invention according to claim 1 or 2,
Dust removing means for removing dust contained in the degreasing / chemical conversion treatment liquid; chemical conversion sludge removing means provided in the first circulation system for removing chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid; The oil removal means for removing the oil contained in the combined chemical conversion treatment liquid, and the liquid which has been provided in the first circulation system and which has passed through the dust removal means, the chemical conversion sludge removal means and the oil removal means to adjust the treatment. A treatment liquid replenishment tank for replenishing the tank can be further added (see claim 3).

In the present invention, the degreasing / chemical conversion treatment liquid in the treatment tank is sucked by the first circulation system and returned to the treatment tank, so that the treatment liquid can be closed and the material cost can be reduced to reduce the cost. Can be planned.

Further, since the treatment tank of the present invention is filled with the degreasing / chemical conversion treatment liquid, the degreasing treatment and the chemical conversion treatment of the object to be treated can be carried out in the minimum one step. As a result, the installation space of the device can be saved and the facility cost can be reduced. Moreover, since the process passage time is shortened, the productivity is improved.

Further, by using the degreasing / chemical conversion treatment liquid, the man-hours for managing the pretreatment conditions can be reduced. Also,
By using this degreasing / chemical conversion treatment liquid, the washing process can be significantly reduced, the amount of the cleaning liquid used can be drastically reduced, and the burden on the wastewater treatment process can be reduced.

Incidentally, the dust removing means can be provided not only in the first circulation system, but also in other than the first circulation system, for example, inside or outside the treatment tank. When the dust removing means is provided in the first circulation system, the treatment liquid in the treatment tank is treated tank → dust removing means → sludge removing means →
It is circulated in the order of oil removal means → treatment liquid supply tank → heat exchanger → treatment tank. In the above invention, the order of the dust removing means, the sludge removing means, and the oil content removing means is not particularly limited, and may be an order other than the order described above.

(3) In the invention according to claim 1 or 2,
A rinse tank that is provided in the subsequent stage of the processing tank and is filled with a cleaning liquid, a second circulation system that sucks the degreasing / chemical conversion processing liquid in the processing tank and supplies it to the rinse tank, and the degreasing / chemical conversion processing liquid Dust removing means for removing dust contained in, and chemical conversion sludge removing means provided in the second circulation system for removing chemical sludge contained in the degreasing / chemical conversion treatment liquid,
An oil content removing means for removing oil contained in the degreasing / chemical conversion treatment liquid, and a water-polar organic substance provided in the second circulation system to separate a water component in the degreasing / chemical conversion treatment liquid from a polar organic solvent. Provided in the solvent separation means and the second circulation system,
It is also possible to add an ion removing means for removing an ionic component from the water component separated by the water-polar organic solvent separating means and returning the residual water to the rinse tank (see claim 6).

In the present invention, the degreasing / chemical conversion treatment liquid in the treatment tank is sucked by the second circulation system, the water component is extracted by the water-polar organic solvent separating means, and the water component is further deionized by the ion removing means. Since the ionic components are removed, pure water can be supplied to the rinse tank. As a result, the treatment liquid can be closed, the regeneration rate can be improved, the material cost can be reduced, and the cost can be reduced and the burden of the wastewater treatment process can be reduced.

Further, since the treatment tank of the present invention is filled with the degreasing / chemical conversion treatment liquid, the degreasing treatment and the chemical conversion treatment of the object to be treated can be carried out in the minimum one step. As a result, the installation space of the device can be saved and the facility cost can be reduced. Moreover, since the process passage time is shortened, the productivity is improved.

Further, by using the degreasing / chemical conversion treatment liquid, the man-hours for managing the pretreatment conditions can be reduced. Also,
By using this degreasing / chemical conversion treatment liquid, the washing process can be significantly reduced, the amount of the cleaning liquid used can be drastically reduced, and the burden on the wastewater treatment process can be reduced.

Incidentally, the dust removing means can be provided not only in the second circulation system, but also in a portion other than the second circulation system, for example, inside or outside the treatment tank. When the dust removing means is provided in the second circulation system, the treatment liquid in the treatment tank is treated tank → dust removing means → sludge removing means →
It is circulated in the order of oil removing means → water-polar organic solvent separating means → ion removing means → rinsing tank. In the above invention, the order of the dust removing means, the sludge removing means, and the oil content removing means is not particularly limited, and may be an order other than the order described above.

(4) In the invention according to claim 1 or 2,
A dust removing unit provided in the first circulation system for removing dust contained in the circulating liquid; and a chemical conversion sludge removing unit provided in the first circulation system for removing chemical sludge contained in the circulating liquid; An oil content removing means provided in the first circulation system for removing oil content contained in the flowing liquid, and a dust removal means, a chemical sludge removal means, and an oil content removal means provided in the first circulation system. A treatment liquid replenishing tank that adjusts the liquid and replenishes it to the treatment tank, a rinse tank that is provided at a subsequent stage of the processing tank and that is filled with a cleaning liquid, and suctions the liquid in the rinse tank to remove the dust. It is also possible to further add a third circulation system that leads to the most upstream means of the chemical sludge removing means and the oil content removing means (see claim 9).

According to the present invention, the treatment liquid in the treatment tank is circulated through the treatment tank → dust removing means → sludge removing means → oil removing means → treatment liquid replenishing tank → heat exchanger → treatment tank, while in the rinse tank. The liquid is circulated through a rinse tank, a dust removing means, a sludge removing means, an oil removing means, a processing liquid replenishing tank, a heat exchanger, and a processing tank.

According to the present invention, the following operational effects are obtained in addition to the operational effects of the invention described above. That is, in the present invention,
The degreasing / chemical conversion treatment liquid in the treatment tank is sucked by the first circulation system and returned to the treatment tank, while the liquid in the rinse tank is
It is sucked by the third circulation system and guided to the most upstream means of the dust removing means, the chemical sludge removing means and the oil content removing means.

Thus, dust, sludge and oil can be removed from the liquid in the rinse tank, and the polar organic solvent component contained in the liquid can be returned to the processing tank through the processing liquid supply means. That is, the liquid in the rinse tank can be closed in addition to the treatment liquid, and the cost can be reduced by reducing the material cost and the burden of the wastewater treatment process can be reduced.

In the above invention, the dust removing means,
The order of the sludge removing means and the oil content removing means is not particularly limited, and may be an order other than the order described above.

(5) In the invention according to claim 1 or 2,
A rinse tank that is provided in the subsequent stage of the processing tank and is filled with a cleaning liquid, a second circulation system that sucks the degreasing / chemical conversion treatment liquid in the processing tank and supplies it to the rinse tank, and the second circulation system And a dust removing means for removing dust contained in the degreasing / chemical conversion treatment liquid, and a chemical conversion sludge removing means provided in the second circulation system for removing chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid. And an oil content removing means provided in the second circulation system for removing an oil content contained in the degreasing / chemical conversion treatment liquid, and a water component in the degreasing / chemical conversion treatment liquid provided in the second circulation system. Water-polar organic solvent separation means for separating water and polar organic solvent, and ionic components are removed from the water component separated by the water-polar organic solvent separation means, and the residual water is provided. To return the ion to the rinse tank A stage and a third circulation system for sucking the liquid in the rinse tank and guiding it to the most upstream of the dust removing means, the chemical sludge removing means and the oil content removing means can be further added. (Refer to claim 13).

In the present invention, the treatment liquid in the treatment tank is circulated through the treatment tank → dust removing means → sludge removing means → oil removing means → water-polar organic solvent separating means → ion removing means → rinsing tank while The liquid in the rinse tank is circulated in the following manner: rinse tank → dust removing means → sludge removing means → oil removing means → water-polar organic solvent separating means → ion removing means → rinse tank.

According to the present invention, the following operational effects are obtained in addition to the operational effects of the above-described invention. That is, in the present invention,
The degreasing / chemical conversion treatment liquid in the treatment tank is sucked by the second circulation system and supplied to the rinse tank, while the liquid in the rinse tank is sucked by the third circulation system to remove dust, chemical conversion sludge. It is led to the most upstream means of the removing means and the oil removing means.

Thus, dust, sludge and oil can be removed from the liquid in the rinse tank, and the water contained in the liquid can be returned to the rinse tank. In other words, in addition to the treatment liquid, the liquid in the rinse tank can be closed.
It is possible to reduce the cost by reducing the material cost and reduce the burden of the wastewater treatment process.

In the above invention, the dust removing means,
The order of the sludge removing means and the oil content removing means is not particularly limited, and may be an order other than the order described above.

(6) In the invention according to claim 1 or 2,
A rinse tank provided in the latter stage of the treatment tank and filled with a cleaning liquid, a treatment liquid replenishment tank for replenishing the degreasing / chemical conversion treatment liquid to the treatment tank, and a liquid of the treatment tank and the rinse tank using a vacuum distillation method. A polar organic solvent, a vacuum distillation means for separating water and residual sludge, and the polar organic solvent separated by the vacuum distillation means is supplied to the treatment liquid replenishing tank and separated by the vacuum distillation means. The treated water may be configured to be supplied to the treatment liquid supply tank and the rinse tank (see claim 23).

In the present invention, the degreasing / chemical conversion treatment liquid in the treatment tank and the liquid in the rinse tank are separated into a polar organic solvent, water and residual sludge by the vacuum distillation means, and the polar organic solvent is replenished with the treatment liquid. Since the water is supplied to the tank and the water is supplied to the processing solution replenishment tank and the rinse tank, the processing solution can be closed,
The cost can be reduced by reducing the material cost.

In particular, compared with the above-mentioned invention, since the polar organic solvent, water and the residual sludge can be separated only by the vacuum distillation means, the system configuration can be simplified, and space saving and cost reduction can be expected.

By the way, as in the above-mentioned invention, since the degreasing / chemical conversion treatment liquid is filled in the treatment tank of the present invention, the degreasing treatment and the chemical conversion treatment of the object to be treated can be carried out in a minimum of one step. As a result, the installation space of the device can be saved and the facility cost can be reduced. Moreover, since the process passage time is shortened, the productivity is improved.

Further, by using the degreasing / chemical conversion treatment liquid, it is possible to reduce the man-hours for managing the pretreatment conditions. Further, by using this degreasing / chemical conversion treatment liquid, the washing process can be significantly reduced, and the amount of the cleaning liquid used can be drastically reduced, and at the same time, the burden on the wastewater treatment process can be reduced.

(7) In the above invention, although not particularly limited, the degreasing / chemical conversion treatment liquid includes alcohol, glycol ether or diethylene glycol ether type polar organic solvent, water, zinc ion, phosphate ion, and manganese. More preferably, at least ions, nickel ions, and sodium ions are included (see claim 25).

[0039]

According to the present invention, even if the flow path of the degreasing / chemical conversion treatment liquid of the heat exchanger is set to be narrow in order to improve the heat exchange efficiency, it is possible to prevent the formation of sludge and oil components, The heat exchange efficiency in the exchanger can be improved.

In addition to this, since the pretreatment liquid can be closed, the cost can be reduced by reducing the material cost.
The burden on the wastewater treatment process can be reduced.

Further, the degreasing treatment and the chemical conversion treatment can be carried out in the minimum one step, the space for installing the apparatus can be saved, and at the same time, the equipment cost can be reduced. Further, since the process passage time is shortened, productivity is improved.

Furthermore, by using the degreasing / chemical conversion treatment liquid, the man-hours for managing the pretreatment conditions can be reduced. Further, by using the degreasing / chemical conversion treatment liquid, the washing process can be significantly reduced, and the amount of the cleaning liquid used is reduced, so that the burden of the wastewater treatment process is reduced.

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a view showing an embodiment of a coating pretreatment apparatus of the present invention, FIG. 2 is a perspective view and a sectional view showing an embodiment of a dust removing means according to the present invention, and FIG. 3 is a dust according to the present invention. FIG. 4 is a perspective view showing another embodiment of the removing means, FIG. 4 is a sectional view showing yet another embodiment of the dust removing means according to the present invention, and FIG. 5 is an embodiment of the water-polar organic solvent separating means according to the present invention. FIG. 6 is a conceptual diagram showing an embodiment of the ion removing means according to the present invention, and FIG. 9 is a front view and a sectional view showing a heat exchanger according to the present embodiment.

FIG. 1 shows a pre-coating treatment step for performing degreasing treatment, surface conditioning and chemical conversion treatment on an object to be coated such as an automobile body. As shown in the figure, the vehicle body 9 is transported by the coating transport line 10 while being mounted on a hanger. In the present embodiment, two dipping tanks 1 and 8 are provided along the coating transfer line 10, and a processing tank 1 (hereinafter, degreasing processing) for performing degreasing treatment and chemical conversion treatment is provided on the upstream side in the conveying direction indicated by an arrow in the figure. It is also referred to as a chemical conversion treatment tank 1), and the downstream side is a rinse tank 8 for cleaning the treated body 9. The treatment tank 1 is filled with a degreasing / chemical conversion treatment liquid, and the rinse tank 8 is filled with pure water.

The degreasing / chemical conversion treatment liquid used in this example is a treatment liquid capable of performing three kinds of treatments such as degreasing treatment, surface conditioning and chemical conversion treatment in the same step. Examples of such a degreasing / chemical conversion treatment liquid include at least alcohol, glycol ether or diethylene glycol ether-based polar organic solvent, water, zinc ion, phosphate ion, manganese ion, nickel ion, and sodium ion. A treatment liquid containing it can be used. By using this treatment liquid, the degreasing process, the surface conditioning process, and the chemical conversion process can be performed simultaneously in one process, which greatly shortens the treatment process, simplifies the treatment equipment, saves space, and improves productivity. Improvement, reduction of drug cost,
It is possible to simplify drug management.

As shown in FIG. 1, in the degreasing chemical conversion treatment tank 1, a circulation system in which the processing liquid in the degreasing chemical conversion treatment tank 1 is sucked by a pump 14 and circulated so as to be returned to the degreasing chemical conversion treatment tank 1 again. 11 is provided, and the circulation system 11 is provided with a dust removing device 2, a chemical conversion sludge removing device 3, in order from the upstream side.
An oil removing device 4 is provided.

The dust removing device 2 removes dust particles such as iron powder contained in the treatment liquid in the degreasing chemical conversion treatment tank 1 and the cleaning liquid in the rinse tank 8. The removed dust particles are discarded and the dust particles are removed. The removed treatment liquid is sent to the next conversion sludge removing device 3. Specific devices that can be used as the dust removing device 2 of this example include a set ring tank, a centrifugal separator, and a magnet separator. Each will be described below.

As shown in FIG. 2, a set ring tank 21 as an example of the dust removing device 2 is provided with a partition plate 213 which meanders the flow path 212 in the tank 211, and enters from an inlet 214. The processing liquid is the partition plate 21.
3 meanders inside the tank and reaches the outlet 215. At this time, the rising speed of the treatment liquid is controlled to be lower than the sedimentation speed of dust particles such as iron powder, whereby dust particles such as iron powder are deposited on the bottom surface of the tank 211, and the treatment liquid can be cleaned. The settling tank 21 is inexpensive as a simple device and is effective for relatively heavy dust other than light dust floating in the treatment liquid.

As shown in FIG. 3, a centrifugal separator 22 as another example of the dust removing device 2 has a slit-shaped special separator provided in a tangential direction with the processing solution and iron dust or the like that have entered from an inlet 221. It is accelerated by passing it through the rotation mechanism 222, and solid matter (dust particles) heavier than the liquid is centrifugally moved along the inner wall to the lower collection chamber 22.
3, while the solid content is discharged from the solid content outlet 224, the processing liquid is raised from the inner pipe 225 to be discharged from the processing liquid outlet 226.
Discharge from. This is an apparatus for cleaning the processing liquid.

As shown in FIG. 4, a magnet type separator 23 as another example of the dust removing device 2 introduces a treatment liquid from an inlet 232 while rotating a drum 231 containing a magnet in a direction of an arrow in the figure. , This processing liquid is drum 23
This is a device for removing magnetic dust particles such as iron when passing through the flow path 233 in contact with 1. Drum 231
The dust particles adhered by the magnetic force are scraped off by the scraper 234, while the treatment liquid from which the dust particles have been removed is discharged from the outlet 235.

The above-mentioned dust removing devices 21, 22,
23 can be used alone or in combination, and in particular, a combination of the set ring tank 21 and the magnet type separator 23 has a high dust trash removal rate and is most preferable.

However, the dust removing means according to the present invention is not limited to the above-mentioned three forms, and includes other forms. Further, the dust removing device 2 of the present example is provided in the circulation system 11, but the dust removing means according to the present invention is provided in the circulation system 11 and also provided inside or outside the degreasing chemical conversion treatment tank 1 itself. is there.

Returning to FIG. 1, the conversion sludge removing device 3 is
The chemical conversion sludge contained in the treatment liquid that has passed through the dust removing device 2 is removed. The removed chemical conversion sludge is discarded, and the treatment liquid from which the chemical conversion sludge has been removed is sent to the next oil content removing device 4. . The chemical conversion sludge removing device 3 is not particularly limited as long as the sludge concentration of the treatment liquid in the degreasing chemical conversion treatment tank 1 shown in FIG. 1 is suppressed to within 150 ppm and does not contaminate the treatment liquid. It can be used without being used.

The oil removing device 4 removes the oil contained in the treatment liquid that has passed through the above-mentioned chemical sludge removing device 3. The removed oil is discarded and the treatment liquid from which the oil has been removed is treated. It is sent to the replenishment tank 6 and the water-polar organic solvent separator 5.

Examples of the oil removing device 4 that can be used in the present invention include a heating type oil removing device, a coalescer type oil removing device, and an ultrafiltration type oil removing device. Of these, the heating type oil removal device is preferably applied to an aqueous solution containing a nonionic surfactant as a degreasing component, and when it is heated to a specific temperature or higher, it becomes insoluble in water itself, It is an oil removal device that utilizes the characteristics of nonionic surfactants, such as oil-water separation into two phases, an oil phase composed of a nonionic surfactant and an aqueous phase.

Further, the coalescer type oil removing device enlarges the oil droplets by destroying the water-oil emulsion by passing the oil droplets dispersed in the aqueous solution in a size of several μm through the filter. It is an oil removal device that can be grown and floated and collected.

The ultrafiltration type oil removing device uses ultrafiltration, that is, a filter having a mesh of about 0.01 to 0.001 μm and a low pressure of about 0.5 to 5 × 10 ⁻⁵ Pa. It is an oil removal device using a filtration method in which colloidal particles are separated from a solvent by pressurization or suction filtration.

These oil removing devices 4 can be used alone or in combination, depending on the required degree of oil-water separation.

As shown in FIG. 1, the treatment liquid replenishing tank 6 and the heat exchanger 50 are provided on the downstream side of the oil removing device 4 of the circulation system 11.
1, 502, a water-polar organic solvent separator 5 and an ion remover 7 are provided.

The treatment liquid replenishing tank 6 passes through the dust removing device 2, the chemical conversion sludge removing device 3 and the oil content removing device 4 to temporarily store the degreasing chemical conversion treatment liquid from which dust particles, chemical conversion sludge and oil components have been removed. In addition to this, a polar organic solvent from which water has been removed by a water-polar organic solvent separator 5 to be described later and water from which ionic components have been removed by an ion remover 7 are supplied. Then, a new degreasing / chemical conversion treatment liquid is supplied and adjusted by the pump 16 from the processing liquid tank 15 containing the new degreasing / chemical conversion treatment liquid, and returned to the degreasing chemical conversion treatment tank 1 via the heat exchanger 501 or 502. Be done.

The heat exchangers 501 and 502 supply the degreasing / chemical conversion treatment liquid for replenishment, which is appropriately adjusted in the treatment liquid replenishment tank 6, to 50%.
It is heated up to a control temperature around 0 ° C. and replenished to the processing tank 1. In this example, two pipes 503 and 5 are provided in parallel with the pipes 111 and 112 that connect the treatment liquid replenishment tank 6 and the treatment tank 1.
04, and the heat exchangers 501 and 502 are provided in the respective pipes 503 and 504. When supplying the degreasing / treatment liquid for replenishment from the treatment liquid replenishment tank 6 to the treatment tank 1, either one of the heat exchangers 501 or 502 is used, so that heat of the pipes 503, 504 provided in parallel is used. Opening / closing valves 505, 506 and 507, 508 are provided before and after the exchangers 501, 502, and the heat exchanger 501 on the left side of FIG.
When using, the opening / closing valves 505 and 506 are opened and the opening / closing valves 507 and 508 are closed. Further, when using the heat exchanger 502 on the right side, the opening / closing valve 5
05, 506 and closing valves 507, 50
It is supposed to open 8.

The heat exchangers 501 and 502 are, for example, as shown in FIG.
As shown in (A), tanks 501a provided at both ends,
501 c and a heat exchange section 501 b in which a treatment liquid flow channel 501 b 1 and a hot water flow channel 501 b 2 are alternately arranged therebetween, and although detailed illustration is omitted, both tanks 501 a, 5
01c is partitioned so that the treatment liquid and the warm water do not mix with each other. And the tank 50 divided into two
The treatment liquid and the hot water are guided from the respective regions of 1a to the respective channels of the heat exchange section 501b, and then flow down into the respective regions of the tank 501c partitioned into two and are taken out separately. As shown in FIG. 7B, the heat exchange section 501b
In the above, in the adjacent flow paths 501b1 and 501b2, the treatment liquid draws heat from the treatment liquid by flowing the treatment liquid and the warm water,
As a result, the treatment liquid is heated to the target temperature. In this example, the heat exchanger 501 raises the temperature of the treatment liquid to around 50 ° C.

Here, the hot water serving as a heat source for heating the treatment liquid is hot water boiler 50 having a burner shown in FIG.
While warming by 9, the hot water is sucked by the pump 511, and hot water pipes 510, 512, 5 shown by dotted lines in FIG.
It is circulated to one heat exchanger 501 by 18. Similarly, the hot water pipes 510, 515, 516 and 518 are circulated to the other heat exchanger 502. When using one of the heat exchangers 501, the hot water boiler 50
9 is circulated through the heat exchanger 501, and when the other heat exchanger 502 is used, the hot water heated by the hot water boiler 509 is used.
In order to circulate the hot water pipes 510 and 510 to the hot water pipes 510 and 515 after branching,
7 is provided.

In order to enhance the heat exchange efficiency in the heat exchangers 501 and 502, the treatment liquid flow path 50 shown in FIG. 9B is used.
It is desirable to reduce the channel width t of 1b1 to increase the amount of heat transfer from the hot water channel 501b2 per unit volume. However, when the channel width t of the treatment liquid channel 501b1 is reduced, it is included in the treatment liquid. Chemical sludge and oil content may adhere to the wall surface and reduce heat transfer efficiency.

However, in this example, the heat exchanger 50
In order to remove the chemical conversion sludge and oil components adhering to the wall surface by regularly cleaning the treatment liquid flow paths 501b1 of 1,502,
A cleaning solution such as nitric acid is supplied from the nitric acid tank 519. The cleaning liquid for cleaning the treatment liquid flow path 501b1 of the heat exchangers 501 and 502 is not limited to nitric acid, and other cleaning liquids may be used.

Therefore, the nitric acid tank 519 and the pipe 503 on the inlet side of the processing liquid flow path of the heat exchanger 501 on one side are connected by the cleaning liquid pipes 521 and 522, and the pipe 112 on the outlet side of the processing liquid flow path is connected to the nitric acid. The tank 519 is connected with a cleaning liquid pipe 526. Further, the pipe 504 on the inlet side of the treatment liquid flow path of the nitric acid tank 519 and the other heat exchanger 502.
Are connected with the cleaning liquid pipes 521 and 523, and the pipe 112 on the outlet side of the processing liquid flow path and the nitric acid tank 519 are connected with the cleaning liquid pipe 528. These cleaning liquid pipes 521, 522, 523, 526 and 528 are shown by a chain line in the figure. Then, a pump 520 is installed in the cleaning liquid pipe 521.
And a heat exchanger 50 for supplying nitric acid cleaning liquid
Cleaning liquid pipes 522, 5 for switching 1, 502
23 is provided with opening / closing valves 524 and 525, and the cleaning liquid pipe 5
On-off valves 527 and 529 are provided at 26 and 528.

In this example, during operation of the coating line, the treatment liquid from the treatment liquid replenishing tank 6 is supplied to either one of the heat exchangers 50.
1 or 502, and after heating to a predetermined temperature there, it is replenished to the treatment tank 1, but a nitric acid cleaning liquid is supplied from the nitric acid tank 519 to the heat exchanger 501 or 502 which is not in use, and this is circulated. Thus, the processing liquid flow path 501b
Wash 1. As a result, the treatment liquid flow path 501b1 of the heat exchangers 501 and 502 can be cleaned with the nitric acid cleaning liquid even when the lines are in operation, so that it is possible to prevent a decrease in heat exchange efficiency due to the formation of chemical conversion sludge and oil. Further, since the treatment liquid flow path 501b1 can be set narrow, the heat exchange efficiency itself can be improved.

The flow paths of the processing liquid for the heat exchangers 501 and 502 are switched, that is, the open / close valves 505 and 5
Opening / closing control of 06, 507, 508 and hot water boiler 50
The switching of hot water hot water piping from 9, that is, the opening / closing control of the opening / closing valves 514 and 517, and the switching of the cleaning liquid piping of the nitric acid cleaning solution from the nitric acid tank 519, that is, the opening / closing control of the opening / closing valves 524, 525, 527, 529,
Execute synchronously.

The water-polar organic solvent separating device 5 separates the water component and the polar organic solvent component from the treatment liquid that has passed through the oil removing device 4. The separated water component is supplied to the ion removing device 7. The separated polar organic solvent component is supplied to the treatment liquid supply tank 6.

The polar organic solvent contained in the degreasing / chemical conversion treatment liquid used in this example is an alcohol, glycol ether or diethylene glycol ether system as described above, and the water-polar organic solvent separator 5 of this example is used. As such, it is desirable to use a method capable of efficiently and inexpensively separating these polar organic solvents from water. Examples of such a separation method include a separation method called pervaporation. As shown in FIG. 5, a separation membrane 51 (non-porous membrane: a membrane having pores of 1 nm or less) 52 having selective permeability is provided on one side (supply side) 52 of a polar organic solvent to be separated and water. The mixed liquid is supplied as it is, and the other side (permeation side) 53 of the separation membrane 51 is evacuated or reduced. Then, using the pressure difference between the supply side 52 and the permeation side 53 as the driving force, the high pressure side (supply side) 52 to the low pressure side (permeation side) 5
When the mixed liquid is moved to 3, the polar organic solvent and the water are separated by interposing the separation membrane 51 having the selective permeability, which has a significantly different diffusion rate for each substance type.

As the above-mentioned separation membrane 51, "a composite membrane having a PVA membrane crosslinked with maleic acid on a support membrane (Japanese Patent Laid-Open No. 59-109204)", "treated with K salt,
Mixed film of 80% carboxymethyl cellulose and 20% polyacrylate (J. Memb. Sci., 32, 20)
7 (1987) "," PVA crosslinked on PNA support membrane "
Composite membrane on membrane (J. Memb. Sci., 36, 4
63 (1988) "," Chitosan derivative hollow fiber membrane (Nikkakai (1989)) "," Cobalt alginate membrane (JP-A-61-404) "," Chitosan sulfate membrane (International Membrane Society ( 1987)) "," Polyion complex composite film of polyacrylic acid obtained by hydrolyzing the surface of PNA-based film and ionene-type polycation (JP-A 1-2240).
No. 03) ”and the like.

The ion removing device 7 removes the ionic component from the water component supplied from the water-polar organic solvent separating device 5. The removed ionic component is discarded, and the remaining water is the treatment liquid replenishing tank 6. And are supplied to the rinse tank 8. The ion removing device 7 used in this example is not a special one, and as shown in FIG. 6, a chelating resin capable of removing cation components contained in the degreasing / chemical conversion treatment liquid, such as zinc ions, nickel ions, and manganese ions. Type ion exchange column 71 filled with a cation exchange resin, and an ion exchange filled with a styrene-based strongly basic anion exchange resin capable of removing anion components contained in the degreasing / chemical conversion treatment liquid, such as phosphate radicals and nitrate radicals. An ion exchange column 73 that is equipped with a column 72 and is filled with H-type strongly acidic cation exchange resin, which is a pure water production apparatus that is usually used to increase the purity of water.
And a decarbonation tower 74 and an anion exchange tower 75 filled with an OH type styrene-based strongly basic anion exchange resin.

The pretreatment apparatus for coating of this example has the above-mentioned structure and is provided with the following five circulation systems. As shown in FIG. 1, first, in the first circulation system 11, the processing liquid in the degreasing chemical conversion treatment tank 1 is degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → processing It is a circulation system that circulates from the liquid replenishment tank 6 to the heat exchanger 501 or 502 to the degreasing chemical conversion treatment tank 1. This corresponds to the first circulation system according to claim 3.

In the second circulation system 12, the treatment liquid in the degreasing chemical conversion treatment tank 1 is degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → water-polar organic solvent separation It is a circulation system that circulates from the device 5 to the ion removal device 7 to the rinse tank 8. This corresponds to the second circulation system according to claim 6.

The third circulation system 13 guides the liquid in the rinse tank 8 to the dust removing device 2 by the pipe 17 and the pump 18, and thereafter, the dust removing device 2 → the chemical sludge removing device 3 → the oil removing device 4 It is a circulation system that circulates. This corresponds to the third circulation system according to claim 9.

In addition to this, the following circulation system is constructed. As the fourth circulation system 111, the first circulation system described above is used.
In the closed circuit of the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil removing device 4 → treatment liquid replenishing tank 6 → heat exchanger 501 or 502 → degreasing chemical conversion treatment tank 1. This is a circulation system in which a water-polar organic solvent separator 5 is added and the polar organic solvent separated by the water-polar organic solvent separator 5 is supplied to the treatment liquid supply tank 6. This corresponds to the circulatory system of claim 5.

As the fifth circulation system 121, the above-described second circulation system 12, that is, the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil removing device 4 → water-polar organic solvent separation Circulation in which the treatment liquid replenishing tank 6 is added to the closed circuit of the device 5 → ion removing device 7 → rinsing tank 8 and a part of the pure water from which the ions have been removed by the ion removing device 7 is supplied to the treatment liquid replenishing tank 6. It is a system. This corresponds to the circulatory system of claim 7.

As the sixth circulation system 131, the above-mentioned third circulation system 13, that is, the rinse tank 8 and the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil removing device 4 → treatment liquid Supply tank 6 → heat exchanger 501 or 50
2 → Circulation in which a water-polar organic solvent separation device 5 is added to the closed circuit of the degreasing chemical conversion treatment tank 1 and the polar organic solvent separated by the water-polar organic solvent separation device 5 is supplied to the treatment liquid supply tank 6. It is a system. This corresponds to the circulation system according to claim 10.

As the seventh circulation system 132, the above-mentioned sixth circulation system 131, that is, the rinse tank 8 and the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → water- Polar organic solvent separator 5-> treatment liquid supply tank 6-> heat exchanger 501 or 502-> degreasing chemical conversion treatment tank 1
Is a circulation system in which an ion removing device 7 is added to the closed circuit of 1, the ions are removed from the water separated by the water-polar organic solvent separating device 5, and the water from which the ions are removed is supplied to the rinse tank 8. This corresponds to the circulation system according to claim 11.

Further, as the eighth circulation system 133, the above-mentioned sixth circulation system 131, that is, the rinse tank 8 and the degreasing chemical conversion treatment tank 1 → dust removing device 2 → chemical conversion sludge removing device 3 → oil content removing device 4 → Water-polar organic solvent separation device 5-> treatment liquid replenishment tank 6-> heat exchanger 501 or 502-> degreasing chemical conversion treatment tank 1 is provided with an ion removing device 7 in the closed circuit and separated by the water-polar organic solvent separation device 5. It is a circulation system that removes ions from the water and supplies the water from which the ions have been removed to the treatment liquid supply tank 6. This corresponds to the circulatory system of claim 12.

As described above, the pretreatment apparatus of this embodiment is
It has three circulation systems, first to third when roughly classified, and eight circulation systems when further classified, so that the composition of the treatment liquid in the degreasing chemical conversion treatment tank 1 is stabilized, and there is no quality variation even in continuous treatment. Allows the formation of treated coatings.

Further, by having the third circulation system, the electric conductivity of the washing water in the rinse tank 8 is kept within the range of 20 μS / cm or less, and oil particles, the treatment liquid, dust particles such as iron are deposited on the surface of the treatment object. Adhesion can be prevented, and the carry-out to the next process can be reduced as much as possible.

Second Embodiment FIG. 7 is a view showing another embodiment of the coating pretreatment apparatus of the present invention, and FIG. 8 is a conceptual view showing a vacuum distillation apparatus according to this embodiment.

In the pretreatment device of this embodiment, the dust removing device 2, the chemical conversion sludge removing device 3, the oil removing device 4, the water-polar organic solvent separating device 5 and the ion removing device 7 of the first embodiment described above are replaced. A vacuum distillation apparatus 20 is provided. In addition, regarding the other configurations,
Since it is the same as the embodiment, its detailed description is omitted.

The treatment liquid in the degreasing chemical conversion treatment tank 1 and the liquid in the rinse tank 8 are sucked by the pump 14 and the pump 18, respectively, and are supplied to the vacuum distillation apparatus 20, where the polar organic solvent, water and other The substance is separated. The polar organic solvent separated by the vacuum distillation apparatus 20 is used as the processing liquid replenishment tank 6
Is supplied to the treatment liquid replenishing tank 6, and the remaining water is supplied to the rinse tank 8.

Substances other than the polar organic solvent and water separated by the vacuum distillation apparatus 20 are dust particles such as iron powder, chemical sludge and oil, and these sludges are vacuum distillation apparatus 2
Discarded from 0.

FIG. 8 shows a conceptual diagram of the vacuum distillation apparatus 20.
Vacuum distillation is, for example, several tens to ten. ^-2About Torr
It is a method of distilling at a low pressure and lowering the boiling point. In this example
Want to separate the polar organic solvent and water separately from the treatment liquid
Therefore, as shown in FIG.
02 is provided. Both have the same structure, and the treatment liquid
The device main body 203 to be supplied has
Is depressurized by the vacuum pump 204. Also, the device book
Heater 20 for raising the temperature inside the body 203 to a predetermined temperature
5 is provided, which leads to the inside of the apparatus main body 203.
The processing liquid is heated under reduced pressure and its heating temperature
By setting the boiling point of the target substance to
Only the quality is evaporated and guided to the evaporation pipe 206, and the cooler 207
Liquefy by.

As described above, in this example, since it is desired to separate the polar organic solvent and the water separately from the treatment liquid, only the polar organic solvent is separated by the first-stage vacuum distillation apparatus 201 shown in FIG. It is supplied to the processing liquid replenishment tank 6 shown in FIG. In the next-stage vacuum distillation apparatus 202, only water is separated from the processing solution remaining in the previous vacuum distillation apparatus 201, and this is supplied to the processing solution replenishing tank 6 and the rinse tank 8 shown in FIG. 7. Then, the sludge such as dust, chemical sludge and oil remaining in the vacuum distillation apparatus 202 is discarded here.

Since the boiling point becomes lower in the reduced pressure state, the heat energy supplied to the heater 205 becomes smaller than that in the atmospheric distillation. Especially as the energy of the heater 205,
It is desirable to use waste heat from the paint drying oven.

According to the pretreatment apparatus of the present embodiment, the liquid in the treatment tank 1 and the rinse tank 8 can be recovered and regenerated only by the vacuum distillation apparatus 20, and the entire system can be simplified as compared with the first embodiment. The cost can be reduced.

The embodiments described above are described for facilitating the understanding of the present invention, and not for limiting the present invention. Therefore, each element disclosed in the above-described embodiment is intended to include all design changes and equivalents within the technical scope of the present invention.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a coating pretreatment apparatus of the present invention.

FIG. 2 is a perspective view and a cross-sectional view showing an embodiment of the dust removing device of FIG.

FIG. 3 is a perspective view showing another embodiment of the dust removing device of FIG.

FIG. 4 is a cross-sectional view showing still another embodiment of the dust removing device of FIG.

5 is a conceptual diagram showing an embodiment of the water-polar organic solvent separator of FIG.

FIG. 6 is a conceptual diagram showing an embodiment of the ion removing apparatus of FIG.

FIG. 7 is a diagram showing a second embodiment of the coating pretreatment apparatus of the present invention.

8 is a conceptual diagram showing an embodiment of the vacuum distillation apparatus of FIG.

FIG. 9 is a front view and an enlarged cross-sectional view showing an embodiment of the heat exchanger according to the present invention.

[Explanation of symbols]

1 ... Degreasing chemical conversion treatment tank (treatment tank) 2 ... Dust removal device (dust removal means) 3 ... Chemical conversion sludge removal device (chemical conversion sludge removal means) 4 ... Oil content removal device (oil content removal means) 5 ... Water-polar organic solvent separation Apparatus (water-polar organic solvent separating means) 6 ... Treatment liquid replenishment tank (treatment liquid replenishing means) 7 ... Ion removing device (ion removing means) 8 ... Rinse tank 501, 502 ... Heat exchanger 501b1 ... Treatment liquid flow path 519 ... Nitric acid tank (heat exchanger cleaning means) 520 ... Pump (heat exchanger cleaning means) 521, 522, 523, 526, 528 ... Cleaning liquid piping (heat exchanger cleaning means) 524, 525, 527, 529 ... Open / close valve (heat exchanger cleaning means) )

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 17/04 501 B01D 17/04 501D 4K053 503 503Z 21/02 21/02 P 61/14 500 61/14 500 61/36 61/36 B01J 41/14 B01J 41/14 B B03C 1/00 B03C 1/00 A 1/02 1/02 C 1/12 1/12 B05C 9/10 B05C 9/10 11/10 11 / 10 C02F 1/42 C02F 1/42 G C23C 22/18 C23C 22/18 22/86 22/86 C23G 5/02 C23G 5/02 (72) Inventor Masahiro Kobiga 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan In-Car Co., Ltd. (72) Inventor Hideaki Yaegashi 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. F-term (reference) 4D006 GA06 GA25 KA01 KA12 KA72 KB02 KB11 KB13 KB17 KB18 KB2 0 MA06 MC33 PA02 PA04 PB08 PB15 PB65 PC24 4D025 AA09 AB11 AB15 AB21 AB22 AB23 BA08 BA11 BA16 BA17 BB02 BB09 DA01 DA05 DA07 4D076 AA12 AA22 BB13 BB23 DA10 DA28 FA02 FA19 FA02 FA19 FA20 FA06 4F042 AACB18CB22 CC26 CC30 DA01 DA02 DA03 4K026 AA02 AA11 AA25 BA03 BB06 BB08 EA08 4K053 PA02 PA08 PA18 QA04 RA05 RA25 RA40 RA41 SA06 TA12 TA17 TA20 XA03 XA24 YA06 YA07 YA10 YA13

Claims (25)

[Claims] 1. A treatment tank filled with a degreasing / chemical conversion treatment liquid, a first circulation system for sucking the degreasing / chemical conversion treatment liquid in the treatment tank and returning it to the treatment tank, and a first circulation system. A pair of heat exchangers that are provided in parallel and selectively and exchange heat with the degreasing / chemical conversion treatment liquid returned to the processing tank, and the flow paths of the degreasing / chemical conversion treatment liquid of each heat exchanger. And a heat exchanger cleaning means for supplying a cleaning liquid to each of the cleaning solutions. 2. When the degreasing / chemical conversion treatment liquid sucked from the processing tank is supplied to one of the pair of heat exchangers, the heat exchanger cleaning means removes the degreasing / chemical conversion treatment liquid from the other heat exchanger. The coating pretreatment apparatus according to claim 1, wherein the cleaning liquid is supplied to the flow path. 3. Dust removing means for removing dust contained in the degreasing / chemical conversion treatment liquid, and chemical conversion sludge removal provided in the first circulation system for removing chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid. Means, an oil content removing means for removing oil content contained in the degreasing / chemical conversion treatment liquid, and a liquid which is provided in the first circulation system and which has passed through the dust removing means, the chemical conversion sludge removing means and the oil content removing means The pre-coating treatment apparatus according to claim 1 or 2, further comprising: a treatment liquid replenishing tank for replenishing the treatment tank. 4. The coating pretreatment apparatus according to claim 3, wherein the dust removing means and the oil removing means are provided in the first circulation system. 5. A water-polarity which separates a water component of the liquid passed through the dust removing means, the chemical sludge removing means and the oil content removing means from a polar organic solvent and supplies the polar organic solvent component to the treatment liquid replenishing tank. The coating pretreatment apparatus according to claim 3 or 4, further comprising an organic solvent separating means. 6. A rinse tank, which is provided in the latter stage of the processing tank and is filled with a cleaning liquid, and a second circulation system which sucks the degreasing / chemical conversion processing liquid in the processing tank and supplies it to the rinse tank, Dust removing means for removing dust contained in the degreasing / chemical conversion treatment liquid; chemical conversion sludge removing means provided in the second circulation system for removing chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid; Oil content removing means for removing oil contained in the chemical conversion treatment liquid, and water-polar organic solvent separation means provided in the second circulation system for separating a water component in the degreasing / chemical conversion treatment liquid from a polar organic solvent And an ion removing unit provided in the second circulation system for removing an ionic component from the water component separated by the water-polar organic solvent separating unit and returning the residual water to the rinse tank.
The coating pretreatment apparatus according to claim 1 or 2, further comprising: 7. A treatment liquid replenishing tank for replenishing the degreasing / chemical conversion treatment liquid to the treatment tank, wherein at least a part of the water obtained by the ion removing means is supplied to the treatment liquid replenishing tank. Pretreatment equipment described. 8. The dust removing means and the oil content removing means are provided in the second circulation system.
Pretreatment equipment described. 9. A dust removing means provided in the first circulation system for removing dust contained in the circulating liquid, and a chemical conversion unit provided in the first circulation system for removing the chemical conversion sludge contained in the circulating liquid. Sludge removing means, an oil content removing means provided in the first circulation system for removing oil content contained in the flowing liquid, and a dust removing means, a chemical conversion sludge removing means and an oil content provided in the first circulation system. A treatment liquid replenishing tank for adjusting the liquid that has passed through the removing means to replenish the treatment tank, a rinse tank provided in a subsequent stage of the processing tank and filled with a cleaning liquid, and a liquid in the rinse tank is sucked. 3. The coating pretreatment apparatus according to claim 1 or 2, further comprising: a third circulation system for leading to the most upstream means of the dust removing means, the chemical sludge removing means, and the oil content removing means. 10. A water-polarity which separates a water component of a liquid passed through the dust removing means, a chemical conversion sludge removing means and an oil removing means from a polar organic solvent and supplies the polar organic solvent component to the treatment liquid replenishing tank. The coating pretreatment apparatus according to claim 9, further comprising an organic solvent separating unit. 11. The pre-coating treatment according to claim 10, further comprising an ion removing unit for removing an ionic component from the water component separated by the water-polar organic solvent separating unit and returning the remaining water to the rinse tank. apparatus. 12. The treatment liquid replenishing tank is supplied with at least a part of the water obtained by the ion removing means.
The coating pretreatment apparatus according to 1. 13. A rinse tank which is provided at a subsequent stage of the processing tank and is filled with a cleaning liquid, and a second circulation system which sucks the degreasing / chemical conversion processing liquid in the processing tank and supplies it to the rinse tank. Dust removing means provided in a second circulation system for removing dust contained in the degreasing / chemical conversion treatment liquid; and chemical conversion sludge contained in the degreasing / chemical conversion treatment liquid provided in the second circulation system. Chemical conversion sludge removing means for removing the oil contained in the degreasing / chemical conversion treatment liquid provided in the second circulation system, and the degreasing / chemical conversion treatment provided in the second circulation system. Water-polar organic solvent separation means for separating a water component and a polar organic solvent in the liquid, and an ionic component from the water component provided in the second circulation system and separated by the water-polar organic solvent separation means. Rinse the remaining water after removing And a third circulation system for sucking the liquid in the rinse tank and guiding it to the most upstream of the dust removing means, the chemical sludge removing means, and the oil content removing means. The coating pretreatment apparatus according to claim 1 or 2. 14. The pretreatment apparatus for coating according to claim 13, further comprising a treatment liquid replenishing tank for adjusting the liquid that has passed through the dust removing means, the chemical conversion sludge removing means and the oil content removing means to replenish the treatment tank. . 15. The coating pretreatment apparatus according to claim 14, wherein the polar organic solvent separated by the water-polar organic solvent separating means is supplied to the treatment liquid replenishing tank. 16. At least a part of the water obtained by the ion removing means is supplied to the treatment liquid replenishing tank.
The pretreatment device for coating according to 4 or 15. 17. The coating pretreatment apparatus according to claim 3, wherein the dust removing means comprises a settling tank, a centrifugal separator, and a magnet separator alone or in combination. 18. The chemical conversion sludge removing means adjusts the sludge concentration of the degreasing / chemical conversion treatment liquid in the treatment tank to 150 ppm.
The following 3 to 4 having a controllable full-volume filtration filter.
17. The pretreatment device for coating according to any one of 17. 19. The oil removing device according to claim 3, wherein the oil removing device comprises a heating type oil removing device, a coalescer type oil removing device and an ultrafiltration type oil removing device. Pretreatment equipment for painting. 20. The coating pretreatment apparatus according to claim 5, wherein the water-polar organic solvent separating means separates the water component and the polar organic solvent by a pervaporation method. 21. The ion removing means comprises a cation exchange column filled with a cation exchange resin a, an anion exchange column filled with an anion exchange resin b, and a cation exchange resin c.
The coating pretreatment apparatus according to any one of claims 6 to 8 and 11 to 20, which comprises an ion exchange tower filled with the above, and a decarbonation tower. 22. The cation exchange resin a is a chelate type cation exchange resin, the anion exchange resin b is a styrene type strong basic anion exchange resin, and the cation exchange resin c is a styrene type strong acid. 22. The pretreatment apparatus for coating according to claim 21, which is a cationic cation exchange resin. 23. A rinse tank which is provided at a subsequent stage of the processing tank and is filled with a cleaning liquid; a processing solution replenishing tank for replenishing the degreasing / chemical conversion processing solution to the processing tank; A vacuum distillation method for separating a polar organic solvent, water and residual sludge using a vacuum distillation method, and supplying the polar organic solvent to the treatment liquid replenishment tank, the water is the treatment liquid replenishment tank and the The coating pretreatment apparatus according to claim 1 or 2, wherein the pretreatment apparatus supplies the rinse tank. 24. The coating pretreatment apparatus according to claim 23, wherein waste heat of a coating drying furnace is used as a heat source of the vacuum distillation means. 25. The degreasing / chemical conversion treatment liquid is alcohol,
The coating according to any one of claims 1 to 24, which contains at least a glycol ether or diethylene glycol ether-based polar organic solvent, water, zinc ions, phosphate ions, manganese ions, nickel ions, and sodium ions. Pretreatment equipment.