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Polyester resin for TGIC cured high-gloss powder coating and preparation method of polyester resin

A powder coating, polyester resin technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of insufficient surface brightness, low gloss and gloss, and achieve the effect of improving hydrolysis resistance

Active Publication Date: 2019-07-19
新中法高分子材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in general the gloss of this system will be lower than the gloss of epoxy / polyester type powder coating system
[0003] The high-gloss gloss of the coating film prepared by the existing TGIC cured polyester is below 96%, unless additional wetting accelerators are added to the powder coating to improve the gloss, and the surface does not look bright enough

Method used

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  • Polyester resin for TGIC cured high-gloss powder coating and preparation method of polyester resin

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] A kind of preparation method of the high-gloss powder coating polyester resin that TGIC solidifies comprises the steps:

[0030] Step 1, prepare materials according to the formula;

[0031] The formula includes: 25-33% neopentyl glycol, 0.5-1.5% hydroxypivalic acid hydroxy neopentyl glycol monoester, 3-7% ethylene glycol, 2-butyl-2-ethyl-1 ,3-propanediol 1-3%, terephthalic acid 48-61%, isophthalic acid 3-8%, adipic acid 0.5-2%, trimellitic anhydride 0.6-1.4%;

[0032] Step 2: Heat the reactor to 70-100°C, add neopentyl glycol, ethylene glycol, 2-butyl-2-ethyl-1,3-propanediol, hydroxypivalic acid hydroxy neopentyl glycol monoester , add 0.5-1.2% adipic acid, finally add terephthalic acid, esterification catalyst, and gradually heat up to 240-250°C under the protection of nitrogen to maintain until the measured acid value is 5-25mgKOH / g, then cooled to 190-210°C;

[0033] Step 3: Put in the end-capping agent trimellitic anhydride, isophthalic acid and the remaining ad...

Embodiment 1

[0035] Embodiment 1: formula comprises according to mass percentage: neopentyl glycol 25%, hydroxy neopentyl glycol monoester of hydroxypivalate 1.5%, ethylene glycol 7%, 2-butyl-2-ethyl-1,3 - 3% propylene glycol, 59.5% terephthalic acid, 3% isophthalic acid, 0.5% adipic acid, 0.6% trimellitic anhydride, 0.09g monobutyltin oxide for esterification catalyst, 1076, 0.1g, 168 for antioxidant , 0.1g, and the accelerator is 0.09g of triphenylethylphosphorus bromide.

Embodiment 2

[0036] Embodiment 2: formula comprises according to mass percentage: neopentyl glycol 33%, hydroxy neopentyl glycol monoester of hydroxypivalate 0.5%, ethylene glycol 3%, 2-butyl-2-ethyl-1,3 - 1% propylene glycol, 55% terephthalic acid, 8% isophthalic acid, 0.5% adipic acid, 0.6% trimellitic anhydride, 0.09g monobutyltin oxide for esterification catalyst, 1076, 0.1g, 168 for antioxidant , 0.1g, and the accelerator is 0.08g of triphenylethylphosphorus bromide.

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Abstract

The invention discloses polyester resin for a TGIC cured high-gloss powder coating and a preparation method of the polyester resin. The formula of the polyester resin comprises the following components in percentage by mass: 25-33% of neopentyl glycol, 0.5-1.5% of neopentyl glycol mono(hydroxypivalate), 3-7% of ethylene glycol, 1-3% of 2-butyl-2-ethyl-1,3-propylene glycol, 48-61% of terephthalic acid and 4.1-11.4% of an end-capping agent. The polyester resin prepared according to the formula and the preparation method disclosed by the invention is cured with TGIC, and a coating film with the gloss of 97% or above, bright surface and excellent boiling resistance can be prepared without adding an additional wetting accelerant.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a polyester resin for powder coatings and a preparation method thereof. Background technique [0002] Generally, the conventional polyester / TGIC powder coating system is 93 / 7, and this type is widely used in China. But in general the gloss of this system will be lower than the gloss of epoxy / polyester type powder coating system. [0003] The high-gloss gloss of the coating film prepared by the existing TGIC cured polyester is below 96%, unless additional wetting accelerators are added when preparing the powder coating to improve the gloss, and the surface does not look bright enough. Generally, the coating gloss of epoxy / polyester hybrid polyester is lower, and compared with epoxy / polyester hybrid type, the water boiling resistance is poorer. Under the general powder making formula, the gloss retention rate after boiling is 60%. and below. The market needs a kind of polyester re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D5/03C09D7/63C08G63/60C08G63/85
CPCC08G63/60C08G63/85C09D5/033C09D167/00C08K5/1345C08K5/526
Inventor 邵妃董亿政王慧丽
Owner 新中法高分子材料股份有限公司
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