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Method for preparing high-charge-density cathode electrophoretic paint

A cathodic electrophoretic coating and charge density technology, which is applied in electrophoretic coatings, epoxy resin coatings, coatings, etc., can solve the problems of affecting the anti-corrosion performance of workpieces and uneven coating thickness, so as to increase the average charge density and excellent anti-corrosion performance , good adhesion effect

Active Publication Date: 2015-04-29
HAOLISEN COATING SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In automobile painting, electrophoretic coatings are required to have a high coating ability on the inner cavity of the automobile, because although the electrophoretic coating process can form a layer of coating film on the surface of complex workpieces, due to the shielding effect that is likely to occur during the electrophoretic process, making it The thickness of the coating film on the inner and outer surfaces of the painted workpiece is uneven, especially the thin coating film on the inner surface, which affects the anti-corrosion performance of the entire workpiece

Method used

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  • Method for preparing high-charge-density cathode electrophoretic paint
  • Method for preparing high-charge-density cathode electrophoretic paint
  • Method for preparing high-charge-density cathode electrophoretic paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Preparation of carboxyl-terminated cationic polyurethane resin

[0028]

[0029] *R 1 and R 4 is methyl, R 2 is hydroxyethyl, R 3 2-hydroxypropyl

[0030] **NCO / OH=5:1, hydrophilic group content: 4.34%

[0031] In the reaction flask equipped with a thermometer, agitator and reflux condenser, add the formulated amount of toluene diisocyanate and polyether diol in sequence, and react for 30 minutes after raising the temperature to 70°C; then add ethylene glycol, and continue the reaction at the same temperature 30min; then add hydrophilic chain extender, continue to react at the same temperature for 40min, then analyze the isocyanate group content in the prepolymer by standard di-n-butylamine back titration method, when the isocyanate group content reaches the theoretical value of 17.38% , adding mercaptopropionic acid for capping to obtain a carboxyl-terminated cationic polyurethane resin with an acid value of 232 mgKOH / g.

[0032] 2. Preparation of aminated ...

Embodiment 2

[0051] 1. Preparation of carboxyl-terminated cationic polyurethane resin

[0052]

[0053] *R 1 is butyl, R 4 is ethyl, R 2 and R 3 2-hydroxypropyl

[0054] **NCO / OH=3:1, hydrophilic group content: 9.14%

[0055] In a reaction flask equipped with a thermometer, a stirrer and a reflux condenser, sequentially add the formulated amount of isophorone diisocyanate and two polyether diols with different molecular weights, and react for 50 minutes after heating up to 80°C; then add butyl Diol, continue to react at the same temperature for 30 minutes; then add hydrophilic chain extender, continue to react at the same temperature for 35 minutes, and use standard di-n-butylamine back titration to analyze the content of isocyanate groups in the prepolymer. When the base content reaches the theoretical value of 15.62%, 6-aminocaproic acid is added for capping to obtain a carboxyl-terminated cationic polyurethane resin with an acid value of 140 mgKOH / g.

[0056] 2. Preparation of ...

Embodiment 3

[0067] 1. Preparation of carboxyl-terminated cationic polyurethane resin

[0068]

[0069]

[0070] *R 1 is ethyl, R 2 is hydroxyethyl, R 3 is 3-propoxy-2-hydroxypropyl, R 4 for butyl

[0071] **NCO / OH=2:1, hydrophilic group content: 3.84%

[0072] In a reaction flask equipped with a thermometer, a stirrer and a reflux condenser, sequentially add the prescribed amount of diphenylmethane diisocyanate and polyester diol, and react for 30 minutes after heating up to 60°C; then add hexanediol, and heat up to After 70°C, continue to react for 30 minutes; then add a hydrophilic chain extender, continue to react at the same temperature for 35 minutes, and then use the standard di-n-butylamine back titration method to analyze the isocyanate group content in the prepolymer. When the isocyanate group content reaches When the theoretical value was 7.60%, 2-mercaptobutyric acid was added for capping to obtain a carboxyl-terminated cationic polyurethane resin with an acid value ...

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Abstract

The invention relates to a method for preparing high-charge-density cathode electrophoretic paint. The method comprises the following steps: by using epoxy resin, carboxyl sealing cation polyurethane resin, a chain extender and an organic amine compound as raw materials, carrying out stepwise polymerization and ring-opening reaction to obtain aminated cation polyurethane modified epoxy resin; blending the resin with a totally-enclosed isocyanate crosslinking agent, and adding organic acid for neutralization after completely blending; and finally emulsifying and dispersing in an aqueous medium to obtain the high-charge-density cathode electrophoretic paint. Two ends of cation resin and a main chain of the epoxy electrophoretic paint have ion groups, and therefore the average charge density of each resin molecular chain is increased, and the throwing power of the paint is increased. The modified epoxy resin molecules contain a lot of carbamic acid ester chains, ester bonds, ether bonds, biuret bonds, allophanate bonds and the like, so that an electrophoretic paint film has good adhesive force, toughness, abrasive resistance and elasticity, high glossiness and good antiseptic property.

Description

[technical field] [0001] The invention relates to a preparation method of a cathodic electrophoretic paint with high charge density, in particular a preparation method of a cathodic electrophoretic paint which has a relatively high throwing power and can satisfy the surface coating of complex-structured workpieces, wherein the two ends of the cationic resin Both have ionic groups on the main chain. [Background technique] [0002] Since the 1970s, cathodic electrophoretic coatings have been used more and more in many industries, especially the automotive industry, due to their own advantages, such as the uniform coating of various parts of workpieces with complex shapes. Has been widely used. In automobile painting, electrophoretic coatings are required to have a high coating ability on the inner cavity of the automobile, because although the electrophoretic coating process can form a layer of coating film on the surface of complex workpieces, due to the shielding effect tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D5/44C08G59/58C08G18/66C08G18/48C08G18/42
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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