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Polyester resin with high acid value and low acid value for environment-friendly dry blended low-gloss powder coating and preparation method thereof

A technology of powder coatings and polyester resins, applied in powder coatings, polyester coatings, coatings, etc., to achieve good mechanical properties, excellent matting effects, and good storage stability

Inactive Publication Date: 2009-06-03
GUANGZHOU QINGTIAN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But they are all for TGIC curing. At present, it is rare to see high and low acid value polyester resins for dry-mixed low-light and weather-resistant powder coatings specially used for Primid system curing.

Method used

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  • Polyester resin with high acid value and low acid value for environment-friendly dry blended low-gloss powder coating and preparation method thereof
  • Polyester resin with high acid value and low acid value for environment-friendly dry blended low-gloss powder coating and preparation method thereof
  • Polyester resin with high acid value and low acid value for environment-friendly dry blended low-gloss powder coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment Construction

[0015] Some specific examples are listed below to illustrate the present invention. Table 1 is an example of high acid value polyester resin, and A to F are comparative examples of different monomers and process combinations. In a 50-liter reactor, add neopentyl glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, ethylene glycol, 1,4-cyclohexanediol in the ratio listed in Table 1 Methanol and trimethylolpropane are heated until the materials are melted; then terephthalic acid, adipic acid, and dibutyltin oxide are added in sequence, and the reaction is continued with nitrogen gas, and esterification water begins to be formed and distilled out at about 180°C. 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 9-27 mgKOH / g, A-B, add isophthalic acid, react for 3-5 hours, the acid value reaches 40~50mgKOH / g, vacuum polycondensation for about 1~4h, the acid value reaches 28~35mgKOH / g, add trime...

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Abstract

The invention discloses a polyester resin with a high acid value and a low acid value for an environment-friendly dry blended low-gloss weather-resistant powder coating. The polyester resin is made from the following raw materials by weight percentages by virtue of esterification and condensation reaction: 15%-60% of polyol, 30%-65% of polyacid, 0%-5% of a branching agent, 5%-15% of an acidolysis agent and 0.01%-0.15% of an esterification catalyst. The invention further discloses a preparation method of the polyester resin with the high acid value and the low acid value for the environment-friendly dry blended low-gloss weather-resistant powder coating. Thepolyester resin with the high acid value and the polyester resin with the low acid value have the characteristics of proper glass transition temperature, proper softening point and good storage stability. A powder coating made by curing beta-hydroxyalkyl amide with the polyester resin has the advantages of excellent deglossing effect and good mechanical properties.

Description

technical field [0001] The invention relates to a polyester resin and a preparation method thereof, in particular to an environment-friendly polyester resin for dry-mixed low-light and weather-resistant powder coatings and a preparation method thereof. This polyester resin is primarily used in polyester / primid cure systems. 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. Recently, the amount of weather-resistant low-gloss powder coatings has shown a large upward trend. On the one hand, consumers feel that the reflection of high-gloss glossy coatings is more serious after film formation, which is harmful to human eyes; on the other hand, consumers' aesthetic concepts are becoming more and more The more i...

Claims

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Application Information

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IPC IPC(8): C08G63/12C08G63/78C09D167/00C09D5/03
Inventor 李勇何涛顾宇昕张捷周年忠
Owner GUANGZHOU QINGTIAN INDAL
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