Thick-film high-antiseptic cathode electrophoretic coating

A cathodic electrophoretic coating, thick film technology, applied in the direction of anti-corrosion coatings, electrophoretic coatings, epoxy resin coatings, etc., can solve the problems of coating film shrinkage, too thin coating film, corrosion resistance decline, etc., to improve anti-corrosion performance, improve Coverage, effect of improving anti-corrosion performance

Inactive Publication Date: 2013-09-25
HAOLISEN COATING SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, during the high-temperature baking and curing process of cathodic electrophoretic coatings, the fluidity of the coating film gradually increases. decrease in corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation of embodiment 1 host resin

[0019]

[0020] * Prepared by the reaction of diethylenetriamine and methyl isobutyl ketone according to the molar ratio of 1:2, the solid content of the final product is: 100%

[0021]In the reaction bottle equipped with thermometer, stirrer and reflux condenser, add the 201 epoxy resin, bisphenol A and the first part of methyl isobutyl ketone of formula quantity successively. After the feeding is completed, start stirring and raise the temperature of the reaction system to 120°C and keep it warm. After the raw materials are completely dissolved and mixed uniformly, add triphenylphosphine and raise the temperature to 150°C, and continue to react at this temperature for 2 hours. When the epoxy equivalent of the system reaches the theoretical value (EEW=1140), stop heating; when the system temperature drops below 90°C, add N-methylethanolamine and ketimine to the reaction system, raise the temperature to 120°C again, and T...

Embodiment 2

[0022] The preparation of embodiment 2 host resin

[0023]

[0024] * Prepared by the reaction of diethylenetriamine and methyl isobutyl ketone according to the molar ratio of 1:2, the solid content of the final product is: 100%

[0025] In the reaction bottle equipped with thermometer, stirrer and reflux condenser, add the 201 epoxy resin, bisphenol A and the first part of methyl isobutyl ketone of formula quantity successively. After the feeding is completed, start stirring and raise the temperature of the reaction system to 120°C and keep it warm. After the raw materials are completely dissolved and mixed evenly, add triphenylphosphine and raise the temperature to 150°C, and continue to react at this temperature for 3 hours. When the epoxy equivalent of the system reaches the theoretical value (EEW=1600), stop heating; when the system temperature drops below 90°C, add N-methylethanolamine and ketimine to the reaction system, raise the temperature to 120°C again, and The...

Embodiment 3

[0026] The preparation of embodiment 3 fully blocked isocyanate crosslinking agent

[0027]

[0028] Add the prescribed amount of toluene diisocyanate and dibutyltin oxide into the reaction flask equipped with a thermometer, agitator and reflux condenser, stir and heat up to 70°C and start to add methyl ethyl ketone oxime dropwise. During the dropwise addition, cool down with a water bath and control The temperature does not exceed 75°C. After the dropwise addition, continue to react at 70°C for 2 hours. Use the standard di-n-butylamine back titration method to analyze the remaining isocyanate content in the reaction system. When the remaining isocyanate content is less than 0.5%, Add methyl isobutyl ketone for dilution to obtain a fully blocked isocyanate crosslinking agent with a final solid content of 80%.

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Abstract

The invention relates to a thick-film high-antiseptic cathode electrophoretic coating which comprises an emulsion, the solid content of the emulsion is 30-35%, the PH value is 5.0-7.0, and the conductivity is 1000-2000 microseconds / cm; the solid content comprises the following components by mass percent for the total solid content: 30-70% of matrix resin, 20-40% of a curing agent, 0.1-10% of a filming auxiliary agent, 0.5-1.5% of a cosolvent, 20-50% of an antiseptic inhibitor, and the balance of an organic acid and deionized water; the matrix resin is an aminated modified epoxy resin capable of forming an ionic salt group with the organic acid; the filming auxiliary agent is a polyether at least containing three ether bonds on each molecule and does not contain any hydroxy after alkylation modification. After being coated with a film, the coating has a thickness within 35-40 micrometers, and has the advantages of large filming thickness and high edge coverage; the cation microgel with a high crosslinking density can greatly improve the phenomenon that edge shrinkage occurs in the coating curing process, thereby increasing the coating coverage of work piece edges, and especially improving the antiseptic performance of sharp edge parts of sharp workpieces.

Description

[technical field] [0001] The invention relates to a thick-film type highly anti-corrosion cathodic electrophoretic coating, in particular to an anti-corrosion cathodic electrophoretic coating with relatively high film thickness and good edge corrosion resistance. [Background technique] [0002] Since the 1970s, cathodic electrophoretic coatings have been more and more widely used in many industries, especially the automotive industry, due to their own advantages. As we all know, during the high-temperature baking and curing process of cathodic electrophoretic coatings, the fluidity of the coating film gradually increases. reduced corrosion resistance. Due to the particularity of automobile products, automobile manufacturers have put forward higher requirements for the anti-corrosion performance of automobile bodies and various components. In order to improve the anti-corrosion performance of electrophoretic coatings, many coating manufacturers focus on suppressing the shri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D5/44
Inventor 周贤张萌刘薇薇郭辉史动李书谱康佳
Owner HAOLISEN COATING SHANGHAI
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