Polyester resin for beta-hydroxyalkylamide low temperature curing weather-resistant powder paint and preparation method thereof

A technology of hydroxyalkylamide and powder coatings, which is applied in powder coatings, polyester coatings, coatings, etc., and can solve the problem of high acid value of polyester resins and low-temperature curing of β-hydroxyalkylamide polyester resins. , poor weather resistance and other issues, to achieve good aging performance, good anti-thick film pinhole performance, and good storage stability

Active Publication Date: 2011-04-13
GUANGZHOU KINTE IND
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the acid value of the obtained polyester resin is relatively high, and it is mainly used indoors, and its weather resistance is poor. The process a...

Method used

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  • Polyester resin for beta-hydroxyalkylamide low temperature curing weather-resistant powder paint and preparation method thereof
  • Polyester resin for beta-hydroxyalkylamide low temperature curing weather-resistant powder paint and preparation method thereof
  • Polyester resin for beta-hydroxyalkylamide low temperature curing weather-resistant powder paint and preparation method thereof

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Embodiment Construction

[0027] Some specific examples are enumerated below to illustrate the present invention. Table 1 shows examples of polyester resins, and A to F show comparative examples of different monomers and process combinations. In a 10-liter reactor, add neopentyl glycol, 2-methyl-1,3-propanediol, ethylene glycol, and trimethylolpropane in proportions listed in Table 1, and heat up to material melting; then Add terephthalic acid, adipic acid, butyl tin oxide, 1,4-cyclohexanedicarboxylic acid, and continue to heat up the reaction with nitrogen gas. At about 180°C, esterification water begins to be formed and distilled out, and then the temperature is gradually raised to 250°C. React for 5-10 hours until 95% of the esterification water is discharged, and the acid value reaches 10-20 mgKOH / g, add an acidolysis agent and continue the reaction for 3-5 hours until the acid value reaches 40-50 mgKOH / g, then vacuumize and polycondense for about 1 ~4h, until the acid value reaches 28~36mgKOH / g, t...

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Abstract

The invention discloses polyester resin for a beta-hydroxyalkylamide low temperature curing weather-resistant powder paint. The polyester resin is prepared from the following components by weight percent through melt polycondensation reaction: 25-45% of polyol, 40-55% of aromatic polybasic acid, 0-8% of aliphatic polybasic acid, 0-5% of branching agent, 5-15% of acidolysis agent and 0.01-0.15% ofesterification catalyst. The invention also discloses a preparation method of the polyester resin. The polyester resin prepared by the method disclosed in the invention has the advantages of higher glass transition temperature and softening point and proper melt viscosity and storage stability; and the powder paint prepared from the polyester resin has the advantages of excellent levelling property and mechanical properties, good thick-film pinhole resistance and the like.

Description

technical field [0001] The invention relates to a polyester resin and a preparation method thereof, in particular to a polyester resin for β-hydroxyalkylamide low-temperature curing weather-resistant powder coating and a preparation method thereof. Background technique [0002] With its advantages of economy, environmental protection, high efficiency and excellent performance, powder coatings are gradually replacing organic solvent-based coatings, becoming an important development direction in the coatings industry, and have maintained a relatively fast growth rate. Powder coating metal building materials are also widely used in all aspects of buildings due to their excellent durability, decoration and processing formability. Although the advantages of powder coatings are outstanding, compared with liquid coatings, thermosetting powder coatings generally have higher leveling and curing temperatures (180°C to 200°C) and longer curing times (10 to 30min). This makes the powde...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/181C08G63/199C08G63/20C09D167/02C09D5/03C09D7/12
Inventor 李勇何涛周年忠顾宇昕
Owner GUANGZHOU KINTE IND
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