JP5372351B2 - How to determine the wavelength of light when curing a surfacer when repairing a body panel - Google Patents

Abstract

The invention relates to a method for repairing vehicle decorative plate, which includes a process for coating whole-face paint before top coat coating, drying and hardening the whole-face paint. In the process, after coating the whole-face paint containing volatilizing agent, a method for using ultraviolet ray or infrared ray to irradiate the whole-face paint to make the temperature of the paint more than 50 DEG C to accelerate the volatilization of the volatilizing agent can be employed to dry and harden the whole-face paint; when repairing time is unstinted, a way of natural drying is employed; when repairing time is urgent and coating surface of the whole-face paint is more than 4dm<2>, a infrared ray irradiator is employed; and when the coating surface of the whole-face paint is less than 4dm<2>, a ultraviolet ray irradiator is employed. The invention has advantages of providing selective repairing ways for the vehicle decorative plate, adjusting the hardening time of the whole-face paint, not bringing difference to grinding work after the whole-face paint hardening, and providing convenience for vehicle repairing.

Description

The present invention relates to a method for determining the wavelength of light when curing a surfacer in repairing damage caused on the panel surface of various vehicles such as automobiles and trains, and in particular, rapidly shortening the drying and curing time of the surfacer. The present invention relates to a method for determining the wavelength of light when curing a surfacer in repairing a vehicle body panel so that the work efficiency can be improved by improving the surfacer drying / curing method while allowing repair work to be performed.

  When repairing a damaged outer panel of a vehicle, the old paint film is usually peeled off at the damaged location and removed as much as possible by knocking it out, and then putty is put on the location with a spatula or the like. The primer surfacer (or surfacer) is then applied and dried, and then the top coat is applied.

  In particular, the surfacer used in the above repair work is used to erase the paper eyes and small burrows, improve the adhesion of the paint, and improve the finish of the paint by suppressing the suction of color. . If the surfacer is omitted, the painted paint will be sucked into the putty and cause it to slip away, so the surfacer application / curing work plays an extremely important role in a series of repairs. It is difficult to omit this.

  In addition, the process using putty treatment and primer surfacer (surfacer) requires time for curing, and after curing, it is necessary to polish the coated surface smoothly for each coating in order to obtain a good surface condition. For this reason, a great deal of time and labor are required in these processes.

  Conventionally, as such surfacers, there are provided one-component ones called lacquer surfacers and two-component ones that are cured using a curing agent. In particular, the one-pack type lacquer surfacer can adjust the viscosity at the time of use and the service life depending on the amount of the solvent, and it has an appropriate hardness that is easy to polish even when polishing with a polishing cloth or tool. Since it dries quickly, it is desirable in actual work. However, since the conventional two-component reactive surfacer requires time for curing, conventionally, a one-component ultraviolet curing type or visible light curing type surfacer is used for the purpose of shortening the curing time. It was proposed to do.

  For example, a repair method using an ultraviolet curable surfacer is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2000-70845). In this document, an ultraviolet polymerizable composition is used as a putty and a primer surfacer. It is described that the time required for repairing the painted surface of the vehicle can be shortened by curing it with ultraviolet rays.

Further, a repair method using a visible light curable surfacer is disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 2002-167526). This document includes a photopolymerization initiator having photosensitivity in the visible light region. Is used to reduce the work process time by irradiating and curing light having a light intensity of 20 mw / cm ² or more in a wavelength region of 380 to 450 nm. Yes.
JP 2000-70845 A JP 2002-167526 A

  As described above, a repair method using an ultraviolet curable surfacer or a visible light curable surfacer has been proposed. However, when these photo-curing surfacers are used, in order to cure them, a dedicated irradiator must be used, and the actual situation is that curing by natural light cannot be achieved. Certainly, if these photocuring surfacers are used, the time required for curing can be reduced, but if there is sufficient time, that is, if sufficient work time can be secured, For this reason, the irradiator must be operated, which is rather troublesome.

  Therefore, in the present invention, in order to increase the efficiency of work, an optimum work method according to the work time, more specifically, an energy ray such as ultraviolet rays or infrared rays is used as a curing method of the surfacer, or natural light is used. A first object is to provide a method for repairing a vehicle body panel that can be selected to be cured by (ie, sunlight).

  In addition, when the above-mentioned photo-curing type surfacer is used, it is completely cured in a short time, and after curing, it is hardened to the extent that the polishing operation is difficult (especially polishing workability). However, there was still room for improvement.

  Accordingly, a second object of the present invention is to provide a method for repairing a vehicle body panel that can perform polishing work without difficulty even after drying or curing.

  Furthermore, when a two-component reaction type surfacer generally used in the past is used, it takes a long time to cure the surfacer, which has been an obstacle to improving work efficiency.

  Accordingly, a third object of the present invention is to provide a vehicle body panel repairing method that can arbitrarily adjust the curing time by employing various curing methods.

  As a result of diligent research to solve the above problems, the present inventors used a surfacer (solvent volatilization type surfacer) that dries or hardens by volatilization of the solvent, and irradiated with energy rays such as ultraviolet rays and infrared rays. However, by heating to a certain temperature or higher, the curing time is accelerated, and the curing state is found to be comparable to conventional two-component reaction surfacers (such as urethane-based surfacers). Then, the present invention has been completed by adding a method of irradiating and curing energy rays as an option.

  That is, the present invention is a method for repairing a panel surface of a damaged vehicle body in order to solve at least one of the above-mentioned problems, and the repair method applies a surfacer and cures it before applying a paint. In this surfacer coating / curing process, a surfacer containing a volatile solvent is applied to the region where the paint is applied, and energy rays are applied to the applied surfacer as a method for drying / curing the surfacer. Provided is a method for repairing a vehicle body panel, which includes a method of volatilizing a solvent by heating to a certain temperature (desirably about 60 ° C. or higher) while irradiating, and drying and curing.

  As the surfacer used in the above method, a surfacer that contains a volatile solvent such as thinner and is cured by volatilization of the solvent, for example, a quick-drying type one-part surfacer based on an acrylic resin is used. The As a method for drying or curing (hereinafter referred to as “drying / curing”) of such a solvent volatile surfacer, a heating means such as a dryer has been conventionally used, but the inside of the coated or sprayed surfacer layer. Could not be heated. As a result, only the surface layer side is dried and cured first in a state where the solvent is not sufficiently volatilized inside the layer, and the release of the volatile solvent inside is prevented by the cured surface layer part, and the entire layer is dried.・ It took time to cure.

  Therefore, in the present invention, not only the surface layer portion but also the inside of the layer is quickly dried and cured, and energy rays such as ultraviolet rays or infrared rays are irradiated simultaneously with heating in order to shorten the curing time of the entire layer. According to this method, since the volatile solvent in the inside can be volatilized by the energy rays at the same time or before the curing in the surface layer portion, the curing of the entire surfacer layer can be accelerated.

  In the present invention, the surfacer is a paint applied or sprayed on an undercoat paint used to smooth the unevenness of the plating surface such as putty, and a conventional primer, surfacer, and It means to include primer surfacer.

  Further, in the repair method of the vehicle body panel, in the surfacer coating / curing step, natural drying, forced drying using an infrared irradiator depending on the time and / or the coating area that can be spent for curing the applied surfacer Or a method of selecting one or more of forced drying using an ultraviolet irradiator. For example, when sufficient time can be secured as the working time (more specifically, the curing time of the surfacer), by drying and curing by natural drying, the labor of irradiation with energy rays by an infrared ray or ultraviolet ray irradiator can be saved, On the other hand, when sufficient work time (similar to the surfacer curing time) cannot be ensured, energy rays are irradiated using an infrared ray or an ultraviolet ray irradiator to forcibly cure or dry quickly. In addition, when the surface of the surfacer is applied or sprayed over a wide range, the infrared ray irradiates a wide range of energy rays, and when the surface of the surfacer is applied or sprayed over a narrow range, an ultraviolet ray irradiator is used. It can be set as the method of irradiating an energy beam intensively. By adopting various curing methods in this way, it is possible to implement an optimal repair method according to the circumstances on the operator side or the repair requester side and the state of damage.

In particular, when irradiating the surfacer applied in the surfacer coating / curing process with energy rays, as a criterion for determining whether to use ultraviolet rays or to irradiate infrared rays, the application area (or spray area) of the surfacer is 4 dm. Judgment can be made based on whether it is ² or more. More specifically, when the application area (or spray area) is less than 4 dm ² , a lamp having a maximum emission spectrum in a wavelength region of 100 to 450 nm, desirably 100 to 380 nm, particularly desirably 300 to 380 nm (ultraviolet irradiation) It is desirable to use a lamp (infrared light irradiation lamp) having a maximum emission spectrum in a wavelength range of 780 nm to 100 μm when the coating area is 4 dm ² or more. This is based on the premise that the solvent volatile surfacer is cured using an energy beam, and further trial and error is performed. The solvent volatilization condition in the surfacer, the average film thickness of the coating film, and the energy beam It was found after comprehensively considering the wavelength of the light.

  Further, when ultraviolet rays (that is, an ultraviolet irradiator) are used to cure the surfacer, the surfacer application / curing step has an irradiation output of 100 w / cm, preferably 120 w / cm or more, relative to the applied surfacer. It is desirable to cure by irradiating energy rays with an ultraviolet irradiator using a metal halide lamp having the following output as a light source. By using such an ultraviolet irradiator, the applied surfacer can be heated to 60 ° C. or more simultaneously with the irradiation of ultraviolet rays, and the working efficiency can be improved.

  Hereinafter, embodiments of a vehicle body panel repair method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a process diagram showing an example of a repair method according to the present invention. FIGS. 2 and 3 are diagrams of an ultraviolet irradiator 8 that can be suitably used for curing the surfacer 11 in the repair method according to the present embodiment. The spectral distribution is shown.

  This repair method will be described in detail with reference to FIG. 1. FIG. 1 (A) is a cross-sectional view of a recessed portion 2 of a vehicle body panel 1 that has been recessed due to damage. The state where the dent 2 is generated is shown. In order to repair the recess 2, first, pretreatment such as degreasing work of the old paint film 3 and removal work of the old paint film 3 is performed, and then work for removing the feather edge as shown in FIG. I do. The work of removing the feather edge can be performed with a sander 5 using paper of about # 120 to # 400. At that time, the angle of the feather edge (angle formed with the steel plate 4) is generally preferably adjusted to 27 to 54 degrees. After removing the feather edge, the removed portion of the old coating film 3 and its periphery are cleaned by air blow or the like, and degreased with a waste cloth soaked with silicon off or the like.

  Next, in order to make the dent 2 subjected to the above pretreatment as shallow as possible, a pit portion is used by using a panel drawer 6 (an instrument generally called a puller) as shown in FIG. Pull 2 out. Then, a putty 10 is embedded in the region as shown in FIG. As the putty 10 that can be used here, various conventionally provided putty materials can be used. For example, a two-component reaction type putty material in which a resin is cured using a curing agent, or ultraviolet polymerization. A photopolymerization type putty material containing an initiator or a visible light polymerization initiator can be used. As a method for curing the embedded putty 10, a method determined for each putty material is employed.

  As shown in FIG. 1 (E), the portion of the cured putty 10 that is raised from the old paint film 3 is a surface of the old paint film 3 by using a polishing tool such as a double action sander or orbital sander 7 and further by hand sharpening. And grind until the surface is flush with the surface to remove the recess 2 in the vehicle body panel 1.

  Next, after masking the periphery with masking paper or the like as necessary, as shown in FIG. 1 (F), the exposed surface of the putty 10 and the exposed surface of the putty 10 and the boundary peripheral portion of the old coating film 3, A solvent volatile type (one-component type) surfacer 11 that is cured by volatilization of the solvent is spray-coated, and then the applied surfacer 11 is cured as shown in FIG.

When curing the surfacer 11, as shown in FIG. 1 (G), the surfacer 11 is irradiated with energy rays such as ultraviolet rays or infrared rays to forcibly and rapidly cure, and is left to stand for curing by natural drying. You can also. That is, in the vehicle body panel repair method according to this embodiment, the surfacer curing method is appropriately selected from the three options of natural drying, forced drying by ultraviolet irradiation, and forced drying by infrared irradiation according to the convenience of the workplace. It is characterized in that it can be selected. As a selection criterion, natural drying is selected when sufficient work time (surfacer curing time) can be secured, and when it is necessary to cure relatively quickly (when sufficient curing time cannot be secured). Depending on the application area of the surfacer, forced drying by ultraviolet irradiation or infrared irradiation is selected. Specifically, when the surface area of the surfacer is less than 4 dm ² , forced drying by ultraviolet rays is selected, and when the surface area is 4 dm ² or more, forced drying by infrared rays is selected.

In particular, when the area of the sprayed surfacer 11 is less than 4 dm ² , light from the ultraviolet irradiator 8 is applied to the surfacer in order to quickly cure the applied solvent volatile (one-component) surfacer 11. The solvent of the surfacer 11 is volatilized by irradiation and further heating to 50 ° C. or higher, desirably about 60 ° C. or higher.

  As such an irradiator 8, an ultraviolet irradiator 8 using a metal halide lamp having an output of 60 w / cm at idling and an output of 120 w / cm at irradiation is used, as shown in FIG. Relative spectral energy is shown relatively. In addition, it is a metal halide lamp in which a metal is added in the form of a halide in addition to mercury in an arc tube, and emits an ultraviolet spectrum having a wavelength of 200 to 400 nm with a main axis of 365 nm as shown in FIG. Whatever is possible can be used. Note that the solid line in FIG. 3 is a standard type, and the chain line is a halogen-less type.

On the other hand, when the area of the sprayed surfacer 11 is 4 dm ² or more, it is desirable to cure using an infrared irradiator used to cure the infrared curing type putty. This is because when infrared rays are used, the radiation area can be widened, and as a result, the surface area of the surfacer 11 can be irradiated with energy rays uniformly.

  In particular, when using an ultraviolet irradiator 8 of 120 w / cm output using a metal halide lamp, the light source of the ultraviolet irradiator is kept at a position 10 to 25 cm away from the surface of the surfacer 11, preferably 15 m ± 5 cm away. If the irradiation is performed, the surfacer can be heated to a certain temperature or higher (50 ° C. or higher, preferably 60 ° C. or higher) together with the light irradiation, so that no additional heat treatment is required.

  And the application | coating process of the surfacer 11 shown to the said FIG.1 (F), and the hardening process of the apply | coated surfacer 11 shown to FIG.1 (G) can be performed repeatedly until a required film thickness is obtained, Is repeated until a film thickness of about 30 μm to 80 μm is obtained.

  By performing the application / curing step of the surfacer 11 as shown in FIGS. 1 (F) and 1 (G), the surfacer 11 can be quickly cured, and the tackiness of the surface after curing can be eliminated. .

  Then, the surface of the hardened surfacer 11 is first polished with # 400 paper using a double action sander, orbital sander 7, etc., and then polished with # 600 to 800 paper, as shown in FIG. To do. In this polishing, the surfacer 11 layer formed by the above-described process can be cured to an appropriate hardness that is easy to polish by selecting a curing method and a curing time. After this polishing operation, it is also possible to confirm the presence or absence of distortion using a distortion removing spray. If distortion is found, the application / curing process of the surfacer 11 is repeated again to obtain distortion. If no is found, the distortion removing spray is wiped off and the process proceeds to the top coating process.

  In the top coating process, first, after washing and degreasing, the top coating 12 is performed by a general method as shown in FIG. 1 (I), and polishing is performed to finish the depression 2 generated in the vehicle body panel 1. Can be repaired.

  Below, in order to confirm the effect by the repair method shown in the said FIG. 1, the hardening time when a solvent volatilization type surfacer was used and the state after hardening were evaluated.

[Adjustment of solvent volatile surfacer]
Prior to this experiment, the following samples were prepared using a trade name “1K Multiplazaf” manufactured by Rock Paint Co., Ltd.

Sample 1: 20 parts of thinner was blended with 100 parts by weight of the solvent volatile surfacer.
Sample 2: 60 parts of thinner was blended with 100 parts by weight of the solvent volatile surfacer.

[Irradiation time and temperature change with UV irradiator]
Using an ultraviolet irradiator (model: DMC-12LC-3D1) manufactured by Nippon Battery Co., Ltd., the temperature change on the surface of the surfacer due to the irradiation time was examined. The distance between the surface of the surfacer and the light source of the ultraviolet irradiator was set to 20 cm ± 5 cm for verification. The results are shown in the following table. The verifications 1 to 9 are results obtained by performing the same conditions and operations a plurality of times in order to ensure verification reliability.

[Irradiation time and temperature change by infrared irradiator]
Using an infrared irradiator (model: SHU-106) manufactured by Andex Co., Ltd., the temperature change of the surface of the surfacer due to the irradiation time was examined. The experiment was performed with the distance between the surface of the surfacer and the light source of the infrared irradiator set to 70 cm ± 10 cm. The results are shown in the following table. In addition, verification 10-1 and 10-2 are the results of having performed the same conditions and operation in multiple times in order to ensure the reliability of verification.

<Discussion>
In the above experiment, when the applied surfacer was forcibly dried using an ultraviolet irradiator, when the surface temperature of the saff exceeded 90 ° C, there was a pinhole in the surfacer during drying (heating). A malfunction occurred. And since film pressure control by application of surfacer and temperature control by ultraviolet irradiator are very difficult to work, when using an ultraviolet irradiator, adjust the irradiation time according to the surface area of the surfacer. It turned out to be optimal to dry.

Namely article 1, 60 seconds for coating area 1 dm ^2, 90 seconds for coating area 2 dm ^2, when the coating area 4 dm ² is dried at 120 seconds, is optimal for curing. As for the article 2, 120 seconds for coating area 1 dm ^2, 0.99 seconds for coating area 2 dm ^2, when the coating area 4 dm ² has been found that drying at 180 seconds, is to cure the optimal .

In addition, when the surface area of the surfacer is 4 dm ² or more, in order to dry and cure the surfacer, there is little difference in the drying time between the case of using ultraviolet rays and the case of using infrared rays, and the irradiation time is also relatively long. Therefore, temperature control is difficult, and the probability of pinholes in the surfacer during drying (heating) is high, so it is dried and cured at 60 ° C. while irradiating with infrared rays for 2 minutes, or dried by natural drying.・ Curing. In particular, when drying / curing is performed by natural drying (20 ° C.), it is desirable to leave it for 30 minutes or more in order to perform a polishing operation after drying, and to leave it for 60 minutes or more in order to perform top coating. I found it desirable.

  Note that the vehicle body panel repair method of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

Process drawing showing repair method according to the present embodiment The spectral energy distribution figure about the irradiation light of the ultraviolet irradiation device used in this Embodiment. The spectral energy distribution figure about the irradiation light of another ultraviolet irradiation device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body panel 2 Indentation part 3 Old coating film 4 Steel plate 5 Polishing tools, such as a sander 6 Panel drawer tool 7 Orbital sander 8 Ultraviolet irradiation machine 10 Putty 11 Surfacer 12 Coating

Claims (4)

Hit the repairing panel surface of a damaged vehicle body, prior to application of the paint, with surfacer coating and curing step of drying and curing this by applying a surfacer, a wavelength determination method of the light when curing the surfacer,
In the surfacer application / curing step, a surfacer containing a volatile solvent is applied to the region where the paint is applied, and the surfacer drying / curing method is 90 ° C or higher at 60 ° C or higher while irradiating the applied surfacer with energy rays. It is a method of volatilizing the solvent by heating so that it does not exceed and drying and curing,
In order to irradiate the surfacer coated with the surfacer coating / curing process with energy rays, if the coating area is less than 4 dm ² , a lamp having a maximum emission spectrum in the wavelength region of 100 to 450 nm is used, and the coating area is 4 dm ^2. In the above, a lamp having the maximum emission spectrum in the wavelength region of 780 nm to 100 μm is used, and the volatile solvent in the inside is volatilized by the irradiated energy rays at the same or earlier than the curing in the surface layer portion of the applied surfacer. and wherein the speed the cure of the entire surfacer layer Te, when repairing a vehicle body panel, the wavelength determination method of the light at the time of curing the surfacer.
In the surfacer coating / curing step, either forced drying using an infrared irradiator or forced drying using an ultraviolet irradiator depending on the time and / or coating area that can be spent curing the applied surfacer. The method for determining the wavelength of light when curing a surfacer in repairing a vehicle body panel according to claim 1, wherein one or more are selected.
In order to irradiate the surfacer coated with the surfacer coating / curing step with energy rays, a lamp having a maximum emission spectrum in a wavelength region of 100 to 450 nm is used when the coating area is less than 4 dm ² , and the surface temperature of the surfacer is The method for determining the wavelength of light when curing a surfacer in repairing a vehicle body panel according to claim 1, wherein the irradiation time is adjusted in accordance with the surface area of the surfacer so as not to exceed 90 ° C.
The surfacer is cured when repairing the vehicle body panel according to claim 1, wherein the surfacer is a surfacer based on an acrylic resin that contains a volatile solvent such as thinner and is cured by volatilization of the solvent. How to determine the wavelength of light .