Polyester resin for rapid curing of weather-durable powdery paint by beta-hydroxyalkylamide and preparation method thereof

A hydroxyalkylamide, rapid curing technology, applied in the field of polyester resin, can solve the problems of β-hydroxyalkylamide rapid curing polyester resin patent reports, etc., to achieve good anti-thick film pinhole performance, good aging performance, excellent leveling and mechanical properties

Inactive Publication Date: 2012-05-09
GUANGZHOU QINGTIAN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The literature has reported many methods of direct polymerization of polyols and polybasic acids into fast-curing polyester resin

Method used

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  • Polyester resin for rapid curing of weather-durable powdery paint by beta-hydroxyalkylamide and preparation method thereof
  • Polyester resin for rapid curing of weather-durable powdery paint by beta-hydroxyalkylamide and preparation method thereof
  • Polyester resin for rapid curing of weather-durable powdery paint by beta-hydroxyalkylamide and preparation method thereof

Examples

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Example Embodiment

[0012] A part of specific examples are listed below to illustrate the present invention. Table 1 is examples of polyester resin, and A to F are comparative examples of different monomers and process combinations. In a 10-liter reactor, add polyols and branching agents in the proportions listed in Table 1, and heat to increase the temperature until the materials melt; then add aromatic polybasic acids, fatty polybasic acids and esterification catalysts in sequence, and pass nitrogen to continue heating up the reaction. The esterified water begins to be generated and distilled out at about 180°C, and then gradually heated to 230°C. After a total of 5-10 hours to 97% of the esterified water is discharged, the acid value reaches 5-15mgKOH / g, and the acid hydrolyzing agent is added. After reacting for 3 to 5 hours, the acid value reaches 45 to 55 mgKOH / g, and the temperature is reduced to 220°C and vacuum polycondensation is applied for about 3 to 5 hours. The reaction can be stopped...

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Abstract

The invention discloses a polyester resin for the rapid curing of a weather-durable powdery paint by a beta-hydroxyalkylamide. The polyester resin is obtained through carrying out a melting polycondensation reaction on the following components, by weight, 30-45% of a polyol, 45-60% of an aromatic polyprotic acid, 0-10% of an aliphatic polyprotic acid, 0-5% of a branching agent, 5-20% of an antiacid and 0.05-0.30% of an esterification catalyst. The invention also discloses a preparation method of the polyester resin. The polyester resin provided in the invention has the advantages of high glass-transition temperature and softening point, and appropriate melting viscosity and storage stability; and powdery paints prepared with the polyester resin have the advantages of excellent levelability, excellent mechanical performance, good thick film pinhole resistance and the like.

Description

technical field [0001] The invention relates to a polyester resin, in particular to a polyester resin for fast-curing weather-resistant powder coatings of β-hydroxyalkylamides, and also relates to a preparation method of the polyester resin. Background technique [0002] Due to its own excellent advantages, 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 since the 1990s. Domestic powder coatings are mainly used in the four major aspects of household appliances, architectural aluminum profiles, pipeline anticorrosion, and general coating. Powder coatings account for 64% of the powder coatings market, and domestic powder coatings for general coatings account for 18% of the powder coatings market; foreign home appliance powder coatings account for 10% of the powder coatings market, while domestic home appliance powder coatings account f...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/20C09D167/02C09D7/12C09D5/03
Inventor 李勇何涛傅环环刘亮曾定万貂
Owner GUANGZHOU QINGTIAN INDAL
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