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

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 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 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 building materials, ...

AI Technical Summary

Problems solved by technology

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