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Weather resistant polyester resin with excellent water-boiling resisting performance and method for preparing same

A technology of polyester resin and water boiling resistance, which is applied in the field of polyester resin and can solve the problems of not many patent reports of polyester resin with water boiling resistance, and achieve excellent water boiling resistance, good leveling performance, and good storage stability.

Active Publication Date: 2014-09-24
GUANGZHOU KINTE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A large number of literatures have reported the method of directly polymerizing polyols and polybasic acids into polyester resins under the condition of organotin catalysts, but there are not many patent reports on polyester resins specifically aimed at improving the boiling resistance of powder coatings
U.S. Patent US5869567 reports a method for synthesizing polyester resin for powder coatings with an acid value of 10-40 mg KOH / g. The article only briefly discusses the factors affecting water boiling resistance, and does not discuss in detail

Method used

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  • Weather resistant polyester resin with excellent water-boiling resisting performance and method for preparing same
  • Weather resistant polyester resin with excellent water-boiling resisting performance and method for preparing same
  • Weather resistant polyester resin with excellent water-boiling resisting performance and method for preparing same

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Embodiment Construction

[0017] 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 a 10-liter reactor, add neopentyl glycol, 2-methyl-1,3-propanediol, ethylene glycol, 1,4-cyclohexanedimethanol, trimethylol Propane, heat up until the material melts; then add terephthalic acid, adipic acid, and butyl tin oxide in sequence, and continue to heat up the reaction with nitrogen gas. Esterification water begins to form and distill at around 180°C, and then gradually heat up to 250°C. React for 5-10 hours until 95% of the esterification water is discharged, the acid value reaches 6-23 mgKOH / g, add acidolysis agent, react for 3-5 hours, the acid value reaches 40-50 mgKOH / g, vacuum polycondensation for about 1-4 hours , the acid value reaches 28 ~ 36mgKOH / g, the reaction can be stopped.

[0018] Acid value: 28~36mgKOH / g; glass transition temperature: ...

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Abstract

The invention discloses weather resistant polyester resin with excellent water-boiling resisting performance, which is prepared through the melt polycondensation of the following components: 20-45 percent by weight of polyol, 40-55 percent by weight of aromatic polybasic acid, 0-8 percent by weight of fat polybasic acid, 0-5 percent by weight of branching agent, 5-15 percent by weight of acidolysis agent and 0.01-0.15 percent by weight of esterification catalyst. The invention also discloses a method for preparing the weather resistant polyester resin with excellent water-boiling resisting performance. The polyester resin prepared with the method has high glass transition temperature, high softening point, appropriate melt viscosity and appropriate storage stability. The powder coating produced from the polyester resin has excellent water-boiling resisting performance, good leveling performance and good impact performance, etc.

Description

technical field [0001] The present invention relates to a kind of polyester resin, and the present invention also relates to a kind of preparation method of polyester resin. 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. Powder coating metal building materials are also widely used in all aspects of buildings due to their excellent durability, decoration and processing formability. Since the advent of powder coatings in the early 1970s, its application in aluminum building materials has grown rapidly. At present, the application of powder coatings in aluminum building materials has expanded from Europe to the Americas, Australia, the Far East, the Middle East and Africa. In the coating of aluminum buil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/20C08G63/183C08G63/78C09D167/02C09D5/03C09D7/12
Inventor 李勇何涛周年忠
Owner GUANGZHOU KINTE IND
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