Carboxyl-terminated polyester resin for super weather-proof powder coating and preparation method thereof

Abstract

The invention discloses carboxyl-terminated polyester resin for super weather-proof powder coating. The carboxyl-terminated polyester resin is prepared by the condensation polymerization of the following raw materials in percentage by weight: 23-50% of polyhydric alcohol, 40-65% of aromatic polybasic acid, 0-10% of fatty polybasic acid, 0-2% of branching agent, 10-20% of acidolysis agent and 0.01-0.15% of esterification catalyst. The invention also discloses a preparation method of the polyester resin. The super weather-proof polyester resin disclosed by the invention has proper glass-transition temperature and storage stability; and the prepared powder coating has excellent mechanical performance and weather resistance; and the polyester resin is particularly applicable to the powder coating of the polyester / TGI (triglycidyl isocyanurate) solidifying system.

Description

technical field [0001] The invention relates to a carboxyl-terminated polyester resin for a super weather-resistant powder coating and a preparation method thereof. technical background [0002] In recent years, due to 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. Mainly used in household appliances, garden metal furniture, hardware components, auto parts, outdoor fences and other fields. With the development of the building materials industry, weather-resistant powder coatings are more and more favored by the market, and the outdoor durability prepared by general weather-resistant polyester resins is difficult to meet this demand, which makes the industry more inclined to super-weather-resistant polyester powders Coatings to meet the ...

AI Technical Summary

Problems solved by technology

With the development of the building materials industry, weather-resistant powder coatings are more and more favored by the market, and the outdoor durability prepared by general weather-resistant polyester resins is difficult to meet this demand, which makes the industry more inclined to super-weather-resistant polyester powders Coatings to meet outdoor weather resistance

[0003] Generally speaking, due to the consideration of mechanical properties and cost, weather-resistant polyester resins are mostly made by polycondensation of terephthalic acid and isophthalic acid, while conventional super-weather-resistant polyester resins are mostly made of isophthalic acid. Yes, this leads to poor mechanical properties of the resin, which affects the use of the resin

At present, patent document 200910184341 reports the preparation method of super weather-resistant powder coatings, but most of them obtain super weather resistance by blending weather-resistant polyester resin and fluorocarbon resin, rather than improving the weather resistance of polyester resin; patent document 201010191395 The preparation of super-weather-resistant powder coatings was reported, and the preparation of super-weather-resistant polyester resins was briefly mentioned, but only limited to conventional weather-resistant polyesters prepared by conventional neopentyl glycol and isophthalic acid, and no mention was made of coatings. layer mechanical properties

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