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Polyester resin for TGIC cured high-toughness powder coating and preparation method thereof

A technology of powder coating and polyester resin, which is applied in the field of polyester resin, can solve the problems of low surface hardness of the coating and difficulty in powder coating manufacturing, and achieve excellent mechanical properties, good weather resistance, excellent flexibility and impact resistance. Effect

Active Publication Date: 2014-04-23
GUANGZHOU KINTE IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 102627755 A discloses a polyester resin with an acid value of 30-50 mgKOH / g. The resin uses a large amount of aliphatic polyhydric alcohols such as hexanediol and aliphatic polybasic acids such as adipic acid. The resin has excellent flexibility However, the resin is a semi-crystalline polyester resin, which has the problem of difficulty in manufacturing powder coatings, and the surface hardness of the prepared coating is low, so it is difficult to be widely used in actual production at present.

Method used

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  • Polyester resin for TGIC cured high-toughness powder coating and preparation method thereof
  • Polyester resin for TGIC cured high-toughness powder coating and preparation method thereof

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Embodiment Construction

[0017] Some specific examples are enumerated below to illustrate the present invention. Table 1 is an example of polyester resin, and A-E are comparative examples F of different monomers and process combinations. In a 10-liter reactor, add neopentyl glycol, 2,2-dimethyl-3-hydroxypropionate neopentyl glycol, trimethylolpropane, 1,3, 5-tris(2-hydroxyethyl)cyanuric acid, heat up until the material melts; then add terephthalic acid and monobutyltin oxide, and continue to heat up the reaction with nitrogen gas, and esterification water begins to form and distill out at about 180°C, and then Gradually raise the temperature to 250°C, react for 5 to 10 hours until 95% of the esterified water is discharged, and the acid value reaches 10 to 20 mgKOH / g, add acidolysis agents such as isophthalic acid, adipic acid and dodecanedioic acid, After 2-4 hours of reaction, the acid value reaches 40-50 mgKOH / g, and the vacuum polycondensation takes about 2-4 hours, when the acid value reaches 31-3...

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Abstract

The invention discloses a polyester resin for a TGIC cured high-toughness powder coating. The polyester resin is obtained by a melting condensation polymerization reaction of the following raw materials in percentage by weight: 32-40% of a dihydric alcohol, 52-60% of an aromatic dibasic acid, 0.4-1.6% of a polyhydric alcohol, 2-8% of a fatty dibasic acid, and 0.01-0.15% of an esterification catalyst. The invention also discloses a preparation method of the polyester resin. The prepared polyester resin has an appropriate glass transition temperature, is suitable for a TGIC curing system; and a coating layer of the prepared powder coating has excellent flexibility, and also has excellent mechanical properties under conditions of the room temperature and the low temperature of about -10 DEG C.

Description

technical field [0001] The invention relates to a polyester resin, in particular to a polyester resin for TGIC curing high-toughness powder coating, and also relates to a preparation method of the polyester resin. Background technique [0002] Powder coating has the advantages of no solvent, high utilization rate and excellent comprehensive performance, and it is an important development field of environmentally friendly coatings. One of the basic functions of coatings is to protect the substrate, and keeping the coating function intact is the prerequisite for realizing the protection. [0003] The impact resistance of the coating obtained by powder coating spraying decreases as the temperature drops. When the ambient temperature is low, the impact resistance of the coating also decreases significantly due to the decline in the activity of the main component organic polymer. An obvious example is that some powder coatings have good impact resistance in summer, but in wi...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/685C08G63/85C09D167/02C09D5/03
Inventor 林锡恩何涛李勇顾宇昕刘亮陶志荣阮德亮
Owner GUANGZHOU KINTE IND
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