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Polyester resin for mixed powder coating and preparation method thereof

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of poor solvent resistance of cured films and low curing rate at low temperatures

Active Publication Date: 2010-05-12
HUANGSHAN SHENJIAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the resin for thermal transfer powder is mainly polyester resin, while the curing temperature of the traditional polyester resin coating film is 180-200 ° C, and the low temperature curing rate is low, and the solvent resistance of the cured film is poor.

Method used

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  • Polyester resin for mixed powder coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. Esterification process: In the synthesis reaction vessel, the temperature of the kettle is raised to 100°C, and 10.81mol of ethylene glycol, 10.75mol of diethylene glycol, 10.78mol of 2-methyl-1,3-propanediol, 21.54 mol of neopentyl glycol, 44.28mol of terephthalic acid, 2.35mol of isophthalic acid, 2.33mol of adipic acid, and 0.07mol of monobutyltin oxide. Nitrogen is used for reaction protection, and the temperature of the material is gradually heated to 245°C, and the reaction is continued at this temperature until no distillate is formed. When the top temperature of the reactor drops to 75°C, sampling and analysis are performed. The linearity of the terminal hydroxyl group The acid value of the polyester resin prepolymer is 12.8mgKOH / g; the molar ratio of acid / alcohol in the reactant is 1 / 1.10;

[0030] b. Vacuum process: react the above reactants under negative pressure at a vacuum degree of about 50mmHg and a temperature of 240°C until the acid value is 3.5mgKO...

Embodiment 2

[0036] a. Esterification process: In the synthesis reaction vessel, the temperature of the kettle is raised to 100°C, and 8.06mol of ethylene glycol, 8.02mol of diethylene glycol, 21.67mol of 2-methyl-1,3-propanediol, 16.15 mol of neopentyl glycol, 44.28mol of terephthalic acid, 2.35mol of isophthalic acid, 2.33mol of adipic acid, and 0.06mol of monobutyltin oxide. Nitrogen is used for reaction protection, and the temperature of the material is gradually heated to 245°C, and the reaction is continued at this temperature until no distillate is formed. When the top temperature of the reactor drops to 75°C, sampling and analysis are performed. The linearity of the terminal hydroxyl group The acid value of the polyester resin prepolymer is 13.1mgKOH / g, and the molar ratio of acid / alcohol in the reactant is 1 / 1.10;

[0037] b. Vacuum process: react the above reactants under negative pressure at a vacuum degree of about 50mmHg and a temperature of 240°C until the acid value is 3.2mg...

Embodiment 3

[0043] (a) Esterification process: In the synthesis reaction vessel, the temperature of the kettle is raised to 100° C., and 15.38 mol of diethylene glycol, 46.06 mol of neopentyl glycol, 51.20 mol of terephthalic acid, and 0.07 mol of mono For butyl tin oxide, after feeding the materials, seal the kettle and raise the temperature, and at the same time fill it with nitrogen for reaction protection, gradually heat the temperature of the materials to 245°C, and keep the temperature at this temperature to continue the reaction until no distillate is produced. Sampling analysis was carried out when the tank top temperature dropped to 75°C. The acid value of the hydroxyl-terminated linear polyester resin prepolymer was 5.4mgKOH / g; the molar ratio of acid / alcohol in the reactant was 1 / 1.20;

[0044] (b) Vacuum process: react the above-mentioned reactant under negative pressure at a vacuum degree of about 50mmHg and a temperature of 230°C until the acid value is 1.0mgKOH / g;

[0045] ...

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Abstract

The invention relates to the field of powder coatings, in particular to a polyester resin for a mixed thermal transfer powder coating and a preparation method thereof. The polyester resin for the mixed thermal transfer powder coating comprises the following components and contents: 1 mole percent of acids, 1.05-1.20 mole percent of alcohols, 10-15wt% of trimellitic anhydride and 0.1-1.0wt% of recomposed onium salts, wherein the alcohols accounting for the total alcohol mol percent comprise 10-90 mol% of neopentyl glycol, 0-45 mol% of dimethyl-1,3-propanediol, 0-20 mol% of ethanediol, 10-25 mol% of diethylene glycol; and the acids accounting for the total acid mol percent comprise 80-100 mol% of terephthalic acid, 0-10 mol% of m-phthalic acid and 0-10 mol% of mol% of adipic acid. The functionality of the polyester resin is regulated according to the amount of the branched components of the trimellitic anhydride, thus the obtained cured film has better surface appearance, low temperature (160 DEG C) curing is realized, the curing percent of film coating at low temperature is high, the curing film has fine solvent resistance and the transfer-printed transfer printing film is clear, vivid and easy to tear.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a polyester resin for hybrid thermal transfer powder coatings and a preparation method thereof. Background technique [0002] With the improvement of people's awareness of environmental protection, the application of powder coating is more and more popular, especially the appearance of art texture powder coating and transfer printing technology, which is a milestone in the research history of art texture powder. Transfer printing is divided into two types: thermal transfer printing and water transfer printing. Water transfer printing is rarely used in the powder coating industry due to expensive equipment; thermal transfer printing is based on the sublimation of printing ink on transfer printing paper and transfers to the surface of the substrate coating film. In order to achieve the decorative effect of imitating wood or stone. Among them, the resin for thermal transfer powder is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/183C08G63/80C09D167/02C09D5/03
Inventor 汪志宏毛松林沈福祥叶治国洪健王颖王琼吴佳佳
Owner HUANGSHAN SHENJIAN NEW MATERIAL CO LTD
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