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Bifunctional polyester resin for powder coating and preparation method of polyester resin

A powder coating and polyester resin technology, applied in the field of polyester resin, can solve the problems of unsuitable powder coating, difficult control, complicated process, etc., achieve outstanding comprehensive performance of coating film, diverse polyester resin structure, and huge market application prospects Effect

Inactive Publication Date: 2018-04-03
GUANGZHOU KINTE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its complex process and difficult control, and it is mainly aimed at water-based polyester resins, it is not suitable for the field of powder coatings

Method used

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  • Bifunctional polyester resin for powder coating and preparation method of polyester resin
  • Bifunctional polyester resin for powder coating and preparation method of polyester resin
  • Bifunctional polyester resin for powder coating and preparation method of polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0030] Embodiment 1~4 preparation method is as follows:

[0031] (1) Take the proportioned amount of glycol and branching agent, heat up to the material melts, then add the proportioned amount of dibasic acid and esterification catalyst, and continue to heat up the reaction with nitrogen gas, until 175 ° C ~ 180 ° C for esterification Water begins to be formed and distilled out; then after 8-11 hours, the temperature is gradually raised to 237°C-249°C, and kept at this temperature for 2-6 hours until the material system is clear and transparent;

[0032] (2) Cool down to 200°C-210°C, and vacuumize for 3-5 hours. At this time, the acid value of the material reaches below 15mgKOH / g, and the hydroxyl value is 55-95mgKOH / g;

[0033] (3) Raise the temperature to 228°C-236°C, add a proportioned amount of acidolysis agent, and react for 3-5 hours until the material system is clear and transparent, the acid value reaches 30-55mgKOH / g, and the hydroxyl value is 25-55mgKOH / g;

[0034] ...

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Abstract

The invention discloses bifunctional polyester resin for a powder coating. The polyester resin has two functional groups including a terminal carboxyl group and a terminal hydroxyl group and has the acid value of 20-45 mgKOH / g, the hydroxyl value of 15-45 mgKOH / g, the viscosity of 2,600-5,200 mPa.s at the temperature of 200 DEG C, the number-average molecular weight of 3,000-4,500 and the glass transition temperature of 61-69 DEG C; the polyester resin is mainly prepared from components in mole percent as follows: 44mol%-55mol% of dibasic alcohol, 40mol%-46mol% of binary acid, 0.1mol%-3.0mol%of a branching agent, 4mol%-15mol% of an acidulate agent and 0.01mol%-0.10mol% of an esterification catalyst through melt polymerization. The polyester resin has outstanding comprehensive properties in the aspects of leveling performance, mechanical property, weather fastness, boiling resistance, heat resistance, solvent resistance, heat transfer printing property and the like. The invention alsodiscloses a preparation method of the bifunctional polyester resin for the powder coating.

Description

technical field [0001] The invention belongs to the technical field of polyester resins, in particular to a bifunctional polyester resin for powder coatings and a preparation method thereof. Background technique [0002] Powder coatings are widely used in household appliances, automobiles, office appliances, steel and construction due to their advantages of high efficiency, no pollution and energy saving. At present, polyester resins for powder coatings are divided into carboxyl-terminated polyester resins and hydroxyl-terminated polyester resins. The carboxyl-terminated polyester resin is cured with TGIC, T-105 and epoxy, and the hydroxyl-terminated polyester resin is cured with blocked isocyanate. The polyester resins of the two systems have their own advantages. After the carboxyl-terminated polyester resin and the curing agent are cured to form a film, the overall performance is relatively balanced, the price is low, and the application is wide; while the hydroxyl-termi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/16C08G63/20C09D5/03C09D167/02
CPCC08G63/183C08G63/16C08G63/20C09D5/03C09D167/02
Inventor 李小强李勇谢静曾历孙军芳
Owner GUANGZHOU KINTE IND
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