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Method of preparing low temperature solidifying environment protection type cathode electrophoresis coating

A cathodic electrophoretic coating, an environmentally friendly technology, used in electrophoretic coatings, epoxy resin coatings, polyamide coatings, etc., can solve the problems of reduced flexibility and toxicity of coating films

Inactive Publication Date: 2007-10-17
佛山科富科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyamine makes the resin neutralize and form salt, and makes the resin soluble, but a single polyamine will reduce the flexibility of the coating film
In order to eliminate the influence of lead, some people use metal cobalt salts and tin salts as catalysts, but these catalysts do not significantly reduce the curing temperature of the coating, and they are still toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of curing agent and modification of main resin

[0021] Put 100g of toluene diisocyanate and 3g of methyl isobutyl ketone into a four-necked flask with a condenser, nitrogen protection and reflux device, and raise the temperature to 65°C; add 51g of methyl ethyl ketone oxime and isocyanate dropwise between 65°C and 75°C The acid value is controlled at 160±5; add 21g of trimethylolpropane, heat up to 120°C after adding, keep warm for 2 hours to make the isocyanate value control index 28±1, drop the temperature to 100°C, add 10g of methyl ethyl ketone oxime, and stir After 30 minutes, add 17g of methyl isobutyl ketone for dilution, control the isocyanate value below 1, and control the solid content of the curing agent to 90±2%.

[0022] Put 11g of isophorone diisocyanate and 0.2g of methyl isobutyl ketone into a four-necked flask with a condenser, nitrogen protection and reflux device, raise the temperature to 50°C, add 4.8g of methyl ethyl ketone oxime dr...

Embodiment 2

[0037] (1) Preparation of curing agent and modification of main resin

[0038] Put 104g of toluene diisocyanate and 3g of methyl isobutyl ketone into a four-necked flask with a condenser, nitrogen protection and reflux device, and raise the temperature to 65°C; add 50g of dimethylethanolamine dropwise between 65°C and 75°C, The isocyanic acid value is controlled at 160±5; add 21g of trimethylolpropane, heat up to 120°C after adding, keep warm for 2 hours, make the isocyanic acid value control index 28±1, drop the temperature to 100°C and add 9g of dimethyl base ethanolamine, after stirring for 30 minutes, add 10g of ethylene glycol butyl ether and 7g of methyl isobutyl ketone for dilution, control the isocyanate value below 1, and control the solid content of the curing agent to 90±2%.

[0039]Put 13g of toluene diisocyanate and 0.3g of methyl isobutyl ketone into a four-necked flask with a condenser, nitrogen protection and reflux device, raise the temperature to 50°C, add 6....

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Abstract

The invention discloses an environment-friendly cathode electrophoretic coating with a low heating loss and low solvent content which can be cold cured. The method includes following steps and craft conditions: (1) preparation of curing agent and modification of mainbody resin. The curing agent is prepared by reaction of isocyanate, ketoximes solvent and trimethylolpropane so as to produce multifunctional group for closing the isocyanate curing agent. The whole reaction of mainbody resin modification includes chain extension reaction of epoxide resin, ring-opening reaction of amine and polyamide to the epoxide resin, the preparation of semi enclosed isocyanate and grafting reaction steps; (2) preparation of the catalytic curing agent slurry; (3) preparation of cathode electrophoretic coating latex and color paste. The invention improves the epoxide resin stability, reduces the resin curing temperature, and declines the heating loss of the dope and the discharge of the solvent. It applies extracting method in the latex producing process to reduce the solvent content so as to produce a environment-friendly cathode electrophoretic coating which can be cold cured.

Description

technical field [0001] The invention relates to a preparation method of cathodic electrophoretic paint, in particular to a preparation method of an environment-friendly cathodic electrophoretic paint capable of curing at low temperature. technical background [0002] Ordinary cathodic electrophoretic coatings use water as the dispersion medium, a composition composed of amine-modified epoxy resin and separated blocked isocyanate, with functional additives and pigments added. During the baking process of the cathodic electrophoretic coating film, the hydroxyl group in the matrix resin and the isocyanate in the curing agent react to form a stable polyurethane structure, which makes the coating film have ideal properties. The deblocking temperature of traditional electrophoretic coating separation type blocked isocyanate is relatively high, and the curing temperature of the coating is about 170°C; the heating loss and solvent content of the coating are high (the national standa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/44C09D163/00C09D177/00
Inventor 袁兴钟萍谢悦红蒙文坚
Owner 佛山科富科技有限公司
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