Bio-based polyester resin for powder coating and preparation method of bio-based polyester resin

Abstract

The invention discloses a bio-based polyester resin for powder coatings, which is characterized in that it comprises the following components and their mass percentages: bio-based polyol: 30-50%; bio-based polyacid 40-60%; bio-based acid Debonding agent 5-20%; Catalyst 0.03-0.15%; Said components are formed by melt polymerization, the acid value is 45-75mgKOH / g, the viscosity is 1500-3500mPa.s, and the number-average molecular weight is 1500-3000. A bio-based polyester resin with a glass transition temperature of 48-60°C; the invention also discloses a preparation method of the polyester resin: since the main raw materials used to synthesize the polyester resin are completely extracted from natural materials, the polyester The resin can be buried in the soil to degrade naturally without any impact on the ecology, and has obvious economic and social benefits; at the same time, the powder coating prepared with it has excellent leveling, excellent mechanical properties, and good storage performance, which can fully meet the indoor use of powder coatings.

Description

technical field [0001] The invention relates to a polyester resin and a preparation method thereof, in particular to a bio-based polyester resin for powder coatings and a preparation method thereof. Background technique [0002] With the decreasing reserves of petrochemical resources, the price of petrochemical products continues to rise. At the same time, the use of petrochemical products has further increased the load on the earth's environment. It is imminent to find renewable resources to replace existing petrochemical raw materials. [0003] Due to its advantages of economy, environmental protection, high efficiency and excellent performance, powder coatings are gradually replacing organic solvent-based coatings and become an important development direction in the coatings industry, especially polyester-based powder coatings, due to their decorative, economical and comprehensive properties The outstanding advantages in this aspect have already occupied half of the entir...

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Problems solved by technology

[0005] Chinese Invention Patent Publication No. CN102827361A discloses a bio-based polyester and its preparation method. The polyester is prepared by esterification and polycondensation of 2,5-furandicarboxylic acid and 1,4-pentanediol. The polyester is suitable for In the plastic industry, there is no report of its use in the coating industry; and the Chinese invention patent publication number: CN103694458A, and another Chinese invention patent publication number: CN104387568A, all involve a polyester polyol and its preparation method, which can be used for Polyurethane raw materials, but there is no report of its use in the coatings industry, and the preparation methods are also different

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