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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 resins under the condition of organotin catalysts, but there are not many patent reports on β-hydroxyalkylamide fast-curing polyester resins.

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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Embodiment Construction

[0012] 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 10 liters of reactors, add the polyhydric alcohol and the branching agent of the ratio listed in Table 1, heat up to material melting; Then add aromatic polyacid, fatty polyacid and esterification catalyst successively, pass into nitrogen and continue to heat up reaction, At about 180°C, esterified water begins to form and distills off, and then gradually raises the temperature to 230°C, and reacts for 5-10 hours until 97% of the esterified water is discharged, and the acid value reaches 5-15mgKOH / g, adding an acidolysis agent, React for 3-5 hours, the acid value reaches 45-55mgKOH / g, cool down to 220°C and vacuum polycondense for about 3-5 hours, and the acid value reaches 30-36mgKOH / g, then stop the reaction.

[0013] Acid value: 30~36mgKOH / g; hydroxyl value ...

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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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