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Pure polyester resin for TGIC cured high temperature resistant powder coatings, and preparation method thereof

A technology of polyester resin and powder coating, applied in the field of polyester resin, can solve the problems of reduced flexibility, decreased adhesion, loss of coating, etc., and achieve high gloss retention, excellent heat resistance and mechanical properties, good The effect of boiling resistance

Active Publication Date: 2015-01-21
GUANGZHOU KINTE IND
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of coating can be used for a long time under the condition of lower than 150 ℃, but in the environment higher than 200 ℃, the coating shows obvious loss of gloss, decreased adhesion, coating embrittlement, obvious yellowing, Damage phenomena such as reduced flexibility and pulverization make the coating lose its protective effect on the substrate
At present, there are few reports on polyester resin products with outstanding heat resistance in the domestic market, and there are even fewer outdoor products suitable for TGIC curing systems

Method used

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  • Pure polyester resin for TGIC cured high temperature resistant powder coatings, and preparation method thereof
  • Pure polyester resin for TGIC cured high temperature resistant powder coatings, and preparation method thereof
  • Pure polyester resin for TGIC cured high temperature resistant powder coatings, and preparation method thereof

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Embodiment Construction

[0021] Some specific examples are enumerated below to illustrate the present invention, and Table 1 shows the examples and comparative examples of polyester resins. In the reactor, add neopentyl glycol, trimethylolpropane, trimethylolethane, tris (2-hydroxyethyl) isocyanurate in the ratio listed in Table 1, and heat up to the Melt; then add terephthalic acid and butyl tin oxide, and continue to heat up the reaction with nitrogen gas. Esterified water begins to form and distill at about 185°C, then gradually heat up to 240°C, and react for 10 to 13 hours to reach 95% esterified water After discharge, the acid value reaches 15-18mgKOH / g, add the acidolysis agent isophthalic acid, react for 2.5-4 hours, the acid value reaches 44-47mgKOH / g, vacuumize and polycondense for about 2.5-4 hours, the acid value reaches 30-35mgKOH / g to stop the reaction.

[0022] Acid value: 30~35mgKOH / g; glass transition temperature: 70~75℃; softening point: 112~118℃; melt viscosity at 200℃ (ICI cone ...

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Abstract

The invention discloses a pure polyester resin for TGIC cured high temperature resistant powder coatings. The acid value, the glass transition temperature, the softening point and the 200DEG C melt viscosity of the pure polyester resin are 30-35mgKOH / g, 70-78DEG C, 112-118DEG C and 15000-20000mPa.s respectively. The pure polyester resin is obtained through a melt condensation polymerization reaction of monomers comprising 33-38mass% of diol, 58-65mass% of aromatic dibasic acid, and 1.5-5mass% of polyol. The invention also discloses a preparation method of the pure polyester resin. The pure polyester resin has a high glass transition temperature and is suitable for a TGIC curing system, and powder coatings prepared by using the pure polyester resin have the advantages of excellent heat resistance, and no gloss loss and high gloss retention of coating layers baked at 270DEG C for 2h or baked at 300DEG C for 0.5h.

Description

technical field [0001] The invention relates to a pure polyester resin for TGIC curing high temperature resistant powder coating, and also relates to a preparation method of the polyester resin. Background technique [0002] With the rapid development of social economy and continuous updating of technology in recent years, various new products have been continuously introduced to the market, and various requirements have been put forward for the performance of powder coatings. On this basis, antibacterial, corrosion-resistant, and The development and application of functional products such as hot type has gradually become the development direction of powder coatings. Generally speaking, heat-resistant powder coatings mean that the coating film can withstand high temperatures above 200°C for a long time, and maintain good mechanical properties of the coating film, so that the protected substrate can function normally in a high-temperature environment. At present, the main hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/685C09D167/02C09D5/03
Inventor 曾历薛棚李小强刘亮曾定
Owner GUANGZHOU KINTE IND
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