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Low-temperature cured terminal carboxyl polyester resin for mixed powder coating and preparation method thereof

A carboxyl-terminated polyester and powder coating technology, applied in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of high melt viscosity, low glass transition temperature, and easy caking of resins, and achieve stable storage Good performance, excellent leveling performance, good impact performance

Active Publication Date: 2010-06-16
GUANGZHOU KINTE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually these methods mainly have the following problems: ①The glass transition temperature of the resin is too low, and it is easy to agglomerate during storage; ②The melt viscosity of the resin is high, which affects the leveling performance of the coating under low temperature curing; ③Some Unsaturated monomers are added during the synthesis of low-temperature curing carboxyl-terminated polyester resins. Due to the high activity of unsaturated monomers, they are easily oxidized, which affects the color of the synthetic resin.

Method used

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  • Low-temperature cured terminal carboxyl polyester resin for mixed powder coating and preparation method thereof
  • Low-temperature cured terminal carboxyl polyester resin for mixed powder coating and preparation method thereof
  • Low-temperature cured terminal carboxyl polyester resin for mixed powder coating and preparation method thereof

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Embodiment Construction

[0016] In a 50L reactor equipped with a heating device, an agitator and a distillation column, add neopentyl glycol, diethylene glycol, ethylene glycol, and trimethylolpropane in proportions listed in Table 1, and heat up until the material melts Finally, add terephthalic acid, isophthalic acid, 1,4-cyclohexanedimethanol, adipic acid, and butyl tin oxide in sequence, and continue to heat up the reaction with nitrogen gas. At about 180°C, esterified water begins to be formed and distilled out. Then gradually raise the temperature to 250°C, react for 5-10 hours until 95% of the esterified water is discharged, the acid value reaches 9-27mgKOH / g, vacuum polycondensation for 0.5-5h, the acid value reaches 3-15mgKOH / g; finally add Proportioned amount of acidolysis agent is used for capping, reacting for 0.5-3 hours, when the reaction reaches an acid value of 60-85 mgKOH / g, the reaction can be stopped by controlling the finally synthesized polyester resin in the following range: acid ...

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Abstract

The invention discloses a low-temperature cured terminal carboxyl polyester resin for mixed powder coating. The polyester resin is prepared by performing melt polycondensation reaction on the following components in percentage by weight: 25 to 45 percent of polyalcohol, 35 to 65 percent of aromatic polyatomic acid, 0 to 10 percent of fat polyatomic acid, 0 to 2 percent of branching agent, 6 to 15 percent of acid hydrolysis agent, and 0.01 to 0.15 percent of esterification catalyst. The invention also discloses a method for preparing the low-temperature cured terminal carboxyl polyester resin. The prepared polyester resin has the characteristics of proper glass-transition temperature, softening point, good storage stability, and the like; the polyester resin, epoxy resin, filler and assistant in a certain proportion are mixed, and the mixture is prepared into powder through melt extrusion mixing, cooling, crushing and sieving; and the prepared powder can be cured at the temperature of 160 DEG C, and has the advantages of excellent leveling performance, good impact performance, and the like.

Description

technical field [0001] The invention relates to a low-temperature curing carboxyl-terminated polyester resin for mixed powder coatings, and also relates to a preparation method of the low-temperature curing carboxyl-terminated polyester resin for mixed powder coatings. Background technique [0002] With its advantages of economy, environmental protection, high efficiency and excellent performance, powder coatings are gradually replacing organic solvent-based coatings and becoming an important development direction in the coatings industry. However, compared with liquid coatings, thermosetting powder coatings have a higher leveling and curing temperature (180 ° C ~ 200 ° C), so that powder coatings can only be used on heat-resistant metal substrates, not suitable for wood, paper, plastics, etc. Heat sensitive substrates. With the expansion of the application field of powder coatings, the traditional curing conditions are no longer suitable for the new development requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/183C08G63/672C08G63/78C09D167/02C09D163/00C09D5/03
Inventor 李业锋何涛肖智涵梁宝荣周年忠
Owner GUANGZHOU KINTE IND
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