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Pigment dispersion resin used for acrylic series cathode electrophoretic coating and pigment slurry thereof

A cathodic electrophoretic coating and acrylic resin technology, applied in the field of pigment dispersion resin and pigment paste, can solve the problems of failing to meet application requirements, rough paint film, poor compatibility, etc., and achieve excellent test results, good effects, and good weather resistance. Effect

Active Publication Date: 2014-02-05
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing quaternary ammonium salt dispersion resins are basically made by modifying bisphenol A type epoxy resin with quaternizing agent, and the compatibility between bisphenol A type epoxy resin and acrylic resin is poor. When the color paste is matched with acrylic emulsion, there are defects such as rough paint film and low gloss, which cannot meet the application requirements

Method used

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  • Pigment dispersion resin used for acrylic series cathode electrophoretic coating and pigment slurry thereof
  • Pigment dispersion resin used for acrylic series cathode electrophoretic coating and pigment slurry thereof
  • Pigment dispersion resin used for acrylic series cathode electrophoretic coating and pigment slurry thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of quaternizing agent A-1

[0021] The quaternizing agent of the present invention is the reaction product of a tertiary amine compound containing active hydrogen and a partially blocked polyisocyanate, which is neutralized with an organic acid. The molar ratio of -NCO group in polyisocyanate is 1.0~2.0:1, and its partially blocked polyisocyanate uses one or more of alcohols, alcohol ethers, alcohols and alcohol ether mixtures as blocking agents and at least It is formed by the reaction of a polyisocyanate compound containing two isocyanate groups. During the reaction, the molar ratio of the -OH group of the blocking agent to the -NCO group of the polyisocyanate compound is 0.5-0.8:1.

[0022] ①The chemical reaction formula involved in the preparation of quaternizing agent

[0023]

[0024]

[0025] ② The raw material formula is listed in Table 1

[0026] Table 1

[0027]

[0028] Note 1: The molar ratio of the -OH group of the active hydroge...

Embodiment 2

[0054] (1) Preparation of quaternizing agent A-2

[0055] 1. The chemical reaction formula involved in the preparation of the quaternizing agent is the same as in Example 1.

[0056] ② The raw material formula is listed in Table 4

[0057] Table 4

[0058]

[0059] Note 1: The molar ratio of the -OH group of the active hydrogen-containing tertiary amine compound to the NCO group in the partially blocked polyisocyanate is 1:1;

[0060] Note 2: The molar ratio of the -OH group of the blocking agent to the -NCO group of the polyisocyanate compound is 0.5:1.

[0061] ③ The preparation process was the same as in Example 1, and the quaternizing agent A-2 (active hydrogen equivalent 700) was prepared, which was stored for future use.

[0062] (2) Preparation of acrylic resin B-2 containing epoxy groups

[0063] 1. The chemical reaction formula for preparing the acrylic resin containing epoxy groups is the same as in Example 1.

[0064] ② The raw material formula is listed in ...

Embodiment 3

[0079] Embodiment 3 prepares cathodic electrophoretic coating pigment slurry

[0080] The pigment slurry of the present invention is prepared by mixing the pigment dispersion resin of the present invention, at least one pigment, a powder metal catalyst and deionized water uniformly, and then grinding and dispersing to a fineness of ≤15 μm with a sand mill. The pigment slurry The solid content of the product is 30-60wt%, calculated as solids, the weight ratio of the pigment to the pigment dispersion resin is 1-10:1, and the powder metal catalyst accounts for 0.5-3% in the total weight of the pigment paste solids.

[0081] (1) Preparation of black pigment paste

[0082] ① The raw material formula is listed in Table 7

[0083] Table 7

[0084]

[0085] ②Preparation process

[0086] After mixing the above raw materials evenly, use a sand mill to grind and disperse to a fineness of ≤15 μm to obtain a black pigment slurry with a solid content of 45wt%. In terms of solids, the ...

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Abstract

The invention relates to a pigment dispersion resin used for an acrylic series cathode electrophoretic coating and a pigment slurry thereof. The dispersion resin is a quaternary ammonium salt modified acrylic resin, and is prepared by subjecting a quaternizing agent and epoxy group-containing acrylic resin to a heating reaction in a solvent. Active hydrogen and an epoxy group are in a mole ratio of 0.8-1.5:1. The quaternizing agent is the reaction product of an active hydrogen-containing tertiary amine compound and partially closed polyisocyanate, and is neutralized by an organic acid, wherein the -OH and the -NCO are in a mole ratio of 1.0-2.0:1. The epoxy group-containing acrylic resin is formed by copolymerization of an epoxy group-containing vinyl monomer and a vinyl monomer containing hydroxyl and alkyl ester. The dispersion resin, at least one pigment, a powder metal catalyst and deionized water together constitute the pigment slurry. The pigment slurry obtained by the dispersion resin provided in the invention has a good mating effect with an acrylic series cathode electrophoretic coating emulsion. The coating film is smooth, and has high gloss and small color difference.

Description

technical field [0001] The invention relates to a pigment dispersing resin for acrylic cathodic electrophoretic paint and its pigment slurry. Background technique [0002] Since the appearance of cathodic electrophoretic coating in the 1970s, it has been rapidly applied in the field of automobile coating due to its excellent comprehensive performance of coating film, high coating utilization rate, and fully automatic coating. With the development of electrophoretic coating technology, electrophoretic coating has been widely used in transportation vehicles, light industry, agricultural machinery, household appliances, military industry, building materials and other industries. Cathodic electrophoretic coatings with acrylic resin as the main resin have excellent decorative properties, gloss retention and color retention, and are very suitable for primers, topcoats and bottom-in-one coatings for agricultural machinery, household appliances, furniture, outdoor building materials...

Claims

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Application Information

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IPC IPC(8): C08F220/32C08F220/28C08F220/14C08F220/18C08F8/44C09D17/00C09D5/44
Inventor 陈卫东顾丽萍陈兴兰周志成
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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