CN119799058A - Environmentally friendly online plasticizer and preparation method thereof - Google Patents
Environmentally friendly online plasticizer and preparation method thereof Download PDFInfo
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- CN119799058A CN119799058A CN202411878709.1A CN202411878709A CN119799058A CN 119799058 A CN119799058 A CN 119799058A CN 202411878709 A CN202411878709 A CN 202411878709A CN 119799058 A CN119799058 A CN 119799058A
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Abstract
本发明公开了一种环保在线脱塑剂，以重量百分比计，包括芳香烃化合物40‑89％，醇醚化合物10‑40％，表面活性剂0.1‑5％，碱性物质0.5‑15％，水0‑40％。本发明采用低毒高沸点的苯甲醇或苯甲醛作为主要的有效成分，可以实现快速的脱塑效果，比其他同类脱塑剂快至少4倍，满足＜3min的在线脱塑要求。在脱塑剂中需要加入少量的碱性成分，平衡pH，对随行挂具的变形量小，不影响材料结构强度，基材的腐蚀量小。脱塑剂中不含氯代烷烃类或苯酚类物质，对环境造成污染小，对人体健康损害小，对基材和操作者伤害小，可实现环保脱塑的效果。The invention discloses an environmentally friendly online plasticizer, which includes 40-89% aromatic hydrocarbon compounds, 10-40% alcohol ether compounds, 0.1-5% surfactants, 0.5-15% alkaline substances, and 0-40% water by weight percentage. The present invention adopts low-toxic high-boiling benzyl alcohol or benzaldehyde as the main effective ingredient, which can achieve a rapid plastic removal effect, which is at least 4 times faster than other similar plasticizers, and meets the online plastic removal requirement of <3min. A small amount of alkaline components need to be added to the plasticizer to balance pH, and the deformation of the accompanying hanger is small, the material structure strength is not affected, and the corrosion of the substrate is small. The plasticizer does not contain chlorinated alkanes or phenols, has little pollution to the environment, little damage to human health, little damage to the substrate and the operator, and can achieve the effect of environmentally friendly plastic removal.
Description
Technical Field
The invention relates to the field of remover of chemical paint or ink, in particular to an environment-friendly online plasticizer and a preparation method thereof.
Background
With the development of industrial automation, electrostatic spraying of powder on the surface of a metal product is usually realized by means of a follow-up hanger, and on-line plastic powder coating on the surface of the follow-up hanger is of great importance. The traditional stripping method comprises a strong acid and strong alkali method, a chloralkane stripping method and the like, and the strong acid and strong alkali stripping method has high corrosiveness on the following hanger and is dangerous to operate. The chloralkane plastic removing method has certain volatilization toxicity and can cause certain harm to the health of workers. And the strong acid and strong alkali method and the chloralkane plastic removing method are off-line plastic removing methods, which have long time consumption and high labor cost. Therefore, development of the online plastic removing agent which is short in plastic removing time, small in corrosion amount of the follow-up hanger, free of influencing the structural strength of materials and capable of being recycled is important.
The Chinese patent CN114672186B discloses a water paint remover and a preparation method thereof, wherein the water paint remover comprises benzyl alcohol, ethylene glycol monobutyl ether, N-methylpyrrolidone, gamma-butyrolactone, dimethyl sulfoxide, phenol, a surfactant, polyoxyethylene octyl phenol ether-10, ethanolamine, a corrosion inhibitor and water, does not contain strong acid and dichloromethane components, avoids the problems of pollution of concentrated acid in waste liquid and harm to human bodies, has low plastic removing efficiency, and is not suitable for online plastic removing. Chinese patent CN113105783a discloses a neutral paint remover, which uses phosphate as main component, but the waste liquid has hidden trouble of causing eutrophication of water body. The Chinese patent No. CN117924994A discloses a paint remover without phenol and halohydrocarbon and a preparation method thereof, and the components comprise benzyl alcohol, ethyl acetate, formic acid, methanol, acetic acid, hexadecyl trimethyl ammonium bromide, an emulsifier OP-10 and deionized water, but the pH of the paint remover is acidic between 2 and 3, has certain corrosiveness to a substrate, is easy to volatilize, and has poor product stability.
Disclosure of Invention
In order to develop the online plastic removing agent which is short in plastic removing time, small in corrosion amount on the following hanger, free of influencing the structural strength of materials and capable of being recycled, the first aspect of the invention provides the environment-friendly online plastic removing agent which comprises, by weight, 40-89% of aromatic compounds, 10-40% of alcohol ether compounds, 0.1-5% of surfactants, 0.5-15% of alkaline substances and 0-40% of water.
As a preferred embodiment, the aromatic hydrocarbon compound is at least one selected from benzyl alcohol, benzaldehyde, benzoic acid, and phenethyl alcohol.
As a preferred embodiment, the aromatic hydrocarbon compound is at least one selected from benzyl alcohol and benzaldehyde.
The inventor finds that the existing paint and plastic removing agent generally adopts chloralkane as a main active ingredient, has strong volatility and toxicity in the use process, is not suitable for online plastic removing, and can cause great physical injury to workers on site. The application adopts low-toxicity high-boiling benzyl alcohol or benzaldehyde as main active ingredients, can realize rapid plastic removal effect, and meets the online plastic removal requirement of <3min, wherein the reason is probably that the benzaldehyde or benzyl alcohol and fatty aldehyde or fatty alcohol have similar structures and can generate electrophilic substitution reaction with plastic materials to generate meta-position substitutes, so that the decomposition and removal of the plastic materials are realized, and the benzaldehyde or benzyl alcohol and the components of the plastic materials have certain compatibility, thereby being beneficial to the dissolution and removal after the decomposition of the plastic materials and realizing the plastic removal effect.
As a preferred embodiment, the alcohol ether compound is at least one selected from the group consisting of ethylene glycol dimethyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, triethylene glycol butyl ether, diethylene glycol methyl ether, diethylene glycol dibutyl ether, and ethylene glycol methyl ether.
As a preferred embodiment, the alcohol ether compound is at least one selected from ethylene glycol butyl ether, diethylene glycol butyl ether, and diethylene glycol methyl ether.
As a preferred embodiment, the weight ratio of the benzaldehyde to the ethylene glycol butyl ether is (15-20): 2-5. Preferably, the weight ratio of the benzaldehyde to the ethylene glycol butyl ether is 16:3.
As a preferred embodiment, the surfactant is selected from one or a combination of two of nonionic surfactant and anionic surfactant.
As a preferred embodiment, the nonionic surfactant is at least one selected from the group consisting of a polyhydric alcohol type surfactant, an alkylphenol ethoxylate type surfactant, a fatty alcohol ethoxylate, and a fatty acid polyoxyethylene ester.
As a preferred embodiment, the polyhydric alcohol type surfactant is polyethylene glycol, and the polymerization number of the polyethylene glycol is 200-600.
As a preferred embodiment, the alkyl group in the alkylphenol ethoxylate type surfactant has a carbon number of 9 to 14.
As a preferred embodiment, the nonionic surfactant is at least one selected from the group consisting of PEG 200, PEG 400, NP-9, OP-10, LF70, TERGITOL 15-S-5.
As a preferred embodiment, the nonionic surfactant is at least one selected from PEG 400, LF70, OP-10.
As a preferred embodiment, the alkaline substance includes an inorganic base and an organic base, and the organic base is at least one selected from sodium methoxide, potassium ethoxide, potassium tert-butoxide, monoethanolamine, diethanolamine, and triethanolamine.
As a preferred embodiment, the inorganic base is at least one selected from potassium hydroxide and sodium hydroxide.
As a preferred embodiment, the alkaline substance is at least one selected from potassium hydroxide, sodium hydroxide, potassium ethoxide, monoethanolamine.
The applicant further found that the addition of a small amount of alkaline component to the stripping agent is required to balance the pH, and if the addition of the alkaline component is excessive, corrosion of the stripping substrate is caused, especially for amphoteric metals such as zinc plates or aluminum plates, metal ions are also caused to be free into the stripping agent, which affects recycling of the stripping agent.
The second aspect of the invention provides a preparation method of an environment-friendly online plastic removing agent, which comprises the following steps:
S1, adding aromatic hydrocarbon compounds into a closed light-resistant container;
s2, adding an alcohol ether compound into an aromatic compound, and starting stirring;
s3, adding a surfactant in the stirring process until the mixture is uniformly stirred;
s4, adding alkaline substances in the stirring process until stirring and dissolving uniformly;
and S5, adding water, stirring and uniformly mixing to obtain the water-based paint.
As a preferred embodiment, the alkaline substance in the step S4 is dissolved in water in advance or put into a special dissolving net cover and then added, the dissolving temperature in the step S4 is 15-45 ℃, and the stirring speed is 30-100r/min.
As a preferred embodiment, the dissolution temperature in the step S4 is 20-40 ℃ and the stirring speed is 35-50r/min.
In the process of the plastic removing agent plastic removing treatment, the consumption, the belt consumption and the volatilization are carried out, the liquid level can be gradually reduced, the automatic dripping flow is required to be set according to the change condition of the liquid level, the liquid of the tank liquid is ensured to be unchanged, and the volatilized working liquid flows back into the plastic removing tank through condensation. The free base is periodically measured and maintained within a prescribed concentration range and is gradually added in portions, particularly when treating substrates such as aluminum and zinc alloys. The free alkali point inspection method comprises the steps of transferring 1.0mL of groove liquid to a 250mL conical flask by using a liquid transferring gun, adding 50mL of pure water, adding 2-3 drops of phenolphthalein wholesaler, then titrating by using 0.05mol/L (0.1N) sulfuric acid standard liquid, wherein the endpoint is the point when the color is changed from pink to colorless, and the point is the number of free alkalinity obtained by multiplying the milliliters of the consumed 0.1N sulfuric acid standard liquid by 10.
The plastic removing groove liquid is naturally settled, and the plastic powder slag can be settled through a high-level groove or can be filtered through a plate filter.
The concentrate should be discharged with aqueous water in a ratio of at least 1:5 dilution waste prior to waste treatment.
Compared with the prior art, the invention has the following beneficial effects:
(1) The environment-friendly online plastic removing agent disclosed by the invention adopts low-toxicity high-boiling benzyl alcohol or benzaldehyde as main active ingredients, can realize a rapid plastic removing effect, is at least 4 times faster than other similar plastic removing agents, and meets the online plastic removing requirement of <3 min.
(2) According to the environment-friendly online plastic removing agent, a small amount of alkaline components are needed to be added in the plastic removing agent, the pH value is balanced, the deformation amount of the follow-up hanger is small, the structural strength of a material is not affected, and the corrosion amount of a base material is small.
(3) The environment-friendly online plastic removing agent disclosed by the invention does not contain chlorinated alkane or phenol substances, has little pollution to the environment, has little damage to human health, has little damage to base materials and operators, and can realize the effect of environment-friendly plastic removing.
(4) The environment-friendly online plastic removing agent disclosed by the invention does not contain paraffin, contains hydrophilic surfactant, is easy to wash with water, does not leave an oil film after plastic removing, and does not influence secondary coating.
(5) The environment-friendly online plasticizer disclosed by the invention has no corrosiveness to the iron base material, has small corrosiveness to the amphoteric metal base material, and can remove the removed plasticizer powder in a natural sedimentation or filtration mode, so that the recycling of the plasticizer is realized, and the service life is long.
Drawings
FIG. 1 is a graph showing corrosion of various hanger templates in the stripping agent of example 1 over time;
FIG. 2 is a graph showing corrosion of various hanger templates in the stripping agent of example 2 over time;
FIG. 3 is a graph showing corrosion of various hanger templates in the stripping agent of example 3 over time;
FIG. 4 is a graph showing corrosion of various hanger templates in the stripping agent of example 4 over time;
FIG. 5 is a graph showing corrosion of various hanger templates in the stripping agent of example 5 over time;
FIG. 6 is a graph showing corrosion of various hanger templates in the stripping agent of example 6 over time.
In the figure, the steel plate is an iron plate, the galvanized plate, the aluminum plate, the plastic removing plate and the plastic removing plate are respectively arranged in the drawing, wherein the aluminum plate is arranged before the plastic removing step, the plastic removing step is carried out for 10min, and the plastic removing step is carried out for 60 min.
Detailed Description
Examples
The environment-friendly online plastic removing agent is prepared from the following raw materials in percentage by weight in particular in table 1.
TABLE 1
The PEG200, PEG400, NP-9, OP-10 were purchased from Nanjing Guta and the LF70 was purchased from Shanghai hard Yongda Co.
The preparation method of the environment-friendly online plastic removing agent comprises the following steps:
S1, adding aromatic hydrocarbon compounds into a closed light-resistant container;
s2, adding an alcohol ether compound into an aromatic compound, and starting stirring;
s3, adding a surfactant in the stirring process until the mixture is uniformly stirred;
s4, adding alkaline substances in the stirring process until stirring and dissolving uniformly;
and S5, adding water, stirring and uniformly mixing to obtain the water-based paint.
In the step S4, the alkaline substance is dissolved in water in advance and then added, and if the alkaline substance does not contain water, the alkaline substance is put into a special dissolving net cover and then added.
In the step S4, the dissolution temperature is 30 ℃, and the stirring speed is 40r/min.
Comparative example 1
The plasticizer comprises, by weight, 19.5% benzyl alcohol, 15% ethylene glycol monobutyl ether, 10.5% N-methylpyrrolidone, 4% gamma-butyrolactone, 4% dimethyl sulfoxide, 10% phenol, 3.5% surfactant JFC-E,4% surfactant OP-10,7.5% monoethanolamine, 1.5% thiourea and 20.5% water.
A preparation method of the plasticizer comprises the following steps of uniformly mixing the preparation raw materials in a weight ratio.
Comparative example 2
The plasticizer comprises, by weight, 35% benzyl alcohol, 7.5% surfactant JFC-E,7.5% ethylene glycol monoethyl ether, 2% trisodium phosphate, 2% sodium pyrophosphate, 2% sodium tripolyphosphate, 2% sodium metasilicate pentahydrate, 2% sodium gluconate, 4% phosphoric acid and 36% water.
A preparation method of the plasticizer comprises the following steps of uniformly mixing the preparation raw materials in a weight ratio.
Comparative example 3
The plasticizer comprises, by weight, 26.5% benzyl alcohol, 18.5% ethyl acetate, 14% methanol, 19% formic acid, 5% acetic acid, 14.5% water, 1.3% hexadecyl trimethyl ammonium bromide, and 1.2% OP-10.
A preparation method of the plasticizer comprises the following steps of uniformly mixing the preparation raw materials in a weight ratio.
Performance testing
1. The plastic removing time is that plastic powder with thickness of 120nm and 220nm is removed, and the time for completely removing the plastic powder at the position of 50mm multiplied by 100mm in the middle of the Q235 cold-rolled steel plate is shorter, and the efficiency is higher. The results of the tests of the stripping agents of comparative examples 1-3 for removing 220nm of Ackesu black powder at different temperatures under ultrasonic conditions are shown in Table 1, and the results of the tests of the stripping agents of comparative examples 1-3 for removing 120nm of Ackesu black powder at different temperatures under ultrasonic conditions are shown in Table 2.
The stripping agents of examples 1-6 were used to remove coatings of varying thickness under ultrasonic conditions and the test results are shown in Table 5.
2. Efficiency of the removal of the molding Using the mold remover of example 7, comparative examples 1-3, the molding powder of 120nm,220nm thickness was removed from the center of the panel by 50mm X100 mm in area percent from the center of the panel. The greater the percentage, the higher the efficiency. The results of the test for removing 220nm of Ackesu black powder under 50 ℃ ultrasonic conditions are shown in Table 3, and the results of the test for removing 120nm of Ackesu black powder under 50 ℃ ultrasonic conditions are shown in Table 4.
3. Corrosion effects the iron plate, the galvanized plate and the aluminum plate are soaked by using the stripping agent of the examples 1-6, and the corrosion condition after 10min of stripping and 60min of stripping is observed by an electron microscope, and the test results are shown in the figures 1-6. In the figure, the steel plate is an iron plate, the galvanized plate, the aluminum plate, the plastic removing plate and the plastic removing plate are respectively arranged in the drawing, wherein the aluminum plate is arranged before the plastic removing step, the plastic removing step is carried out for 10min, and the plastic removing step is carried out for 60 min.
The surface structure of the galvanized and aluminum surface structure of examples 1,3 and 6 is slightly discolored and darkened as seen from the electron microscope, and the surface structure of the galvanized and aluminum surface structure of examples 1,3 and 6 is slightly corroded, because the plasticizer is an alkaline plastic product, but the alkali content is low, and the surface corrosion of the amphoteric metals of zinc and aluminum is serious as seen from the electron microscope, and the surface corrosion of examples 2,4 and 5 is not suitable for the plastic removing process of precise instruments. In contrast, as a result of ICP data analysis from the plasticizer supernatant, it was found that a small amount of aluminum element and zinc element entered the plasticizer, while the iron element was not substantially increased.
TABLE 1
| 50°C | 60°C | 70°C | |
| Comparative example 1 | 110 | 30 | 25 |
| Comparative example 2 | 45 | 24 | 20 |
| Comparative example 3 | 38 | 16 | 13 |
| Example 7 | 4 | 3 | 2.5 |
TABLE 2
TABLE 3 Table 3
| Time of | 10min | 20min | 30min | 40min | 50min | 70min | 90min | 110min |
| Comparative example 1 | 0% | 0% | 2% | 5% | 10% | 30% | 80% | 100% |
| Comparative example 2 | 1% | 5% | 15% | 60% | 100% | |||
| Comparative example 3 | 2% | 5% | 70% | 100% | ||||
| Example 7 | 100% |
TABLE 4 Table 4
| Time of | 10min | 20min | 30min | 40min |
| Comparative example 1 | 5% | 10% | 90% | 100% |
| Comparative example 2 | 40% | 80% | 100% | |
| Comparative example 3 | 80% | 100% | ||
| Example 7 | 100% |
TABLE 5
Claims (10)
1. An environment-friendly online plastic removing agent is characterized by comprising, by weight, 40-89% of aromatic hydrocarbon compounds, 10-40% of alcohol ether compounds, 0.1-5% of surfactants, 0.5-15% of alkaline substances and 0-40% of water.
2. The environment-friendly online plasticizer according to claim 1, wherein the aromatic hydrocarbon compound is at least one selected from benzyl alcohol, benzaldehyde, benzoic acid and phenethyl alcohol.
3. The environment-friendly online plasticizer according to claim 1, wherein the alcohol ether compound is at least one selected from the group consisting of ethylene glycol dimethyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, triethylene glycol butyl ether, diethylene glycol methyl ether, diethylene glycol dibutyl ether, and ethylene glycol methyl ether.
4. The environment-friendly online plasticizer according to claim 1, wherein the surfactant is one or a combination of two of nonionic surfactant and anionic surfactant.
5. The environment-friendly online plasticizer according to claim 4, wherein the nonionic surfactant is at least one selected from the group consisting of a polyhydric alcohol type surfactant, an alkylphenol ethoxylate type surfactant, a fatty alcohol ethoxylate and a fatty acid polyoxyethylene ester.
6. The environment-friendly online plasticizer according to claim 5, wherein the polyol type surfactant is polyethylene glycol, and the polymerization number of the polyethylene glycol is 200-600.
7. The environment-friendly online plasticizer according to claim 5, wherein the alkyl group in the alkylphenol ethoxylate type surfactant has a carbon number of 9-14.
8. The environment-friendly online plasticizer according to claim 1, wherein the alkaline substance comprises an inorganic base and an organic base, and the organic base is at least one selected from sodium methoxide, potassium ethoxide, potassium tert-butoxide, monoethanolamine, diethanolamine and triethanolamine.
9. A method for preparing the environment-friendly online plasticizer according to any one of claims 1 to 8, comprising the following steps:
S1, adding aromatic hydrocarbon compounds into a closed light-resistant container;
s2, adding an alcohol ether compound into an aromatic compound, and starting stirring;
s3, adding a surfactant in the stirring process until the mixture is uniformly stirred;
s4, adding alkaline substances in the stirring process until stirring and dissolving uniformly;
and S5, adding water, stirring and uniformly mixing to obtain the water-based paint.
10. The method for preparing the environment-friendly online plasticizer according to claim 9, wherein the alkaline substances in the step S4 are dissolved in water in advance or put into a special dissolving net cover and then added, the dissolving temperature in the step S4 is 15-45 ℃, and the stirring speed is 30-100r/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202411878709.1A CN119799058A (en) | 2024-12-19 | 2024-12-19 | Environmentally friendly online plasticizer and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202411878709.1A CN119799058A (en) | 2024-12-19 | 2024-12-19 | Environmentally friendly online plasticizer and preparation method thereof |
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