Long-term anti-yellowing polyester resin as well as preparation method and application thereof

Abstract

The invention discloses long-term anti-yellowing polyester resin as well as a preparation method and application thereof. The method comprises the following steps: mixing and performing condensation polymerization on one part of polyatomic acid, polyatomic alcohol, an esterification catalyst and a polymerization inhibitor, so as to obtain a first reaction system with the acid value being 10 to 18mg KOH/g; mixing the other part of the polyatomic acid and the first reaction system and performing transesterification, so as to obtain a second reaction system with the acid value being 48 to 56 mgKOH/g; performing vacuumizing condensation polymerization on the second reaction system, so as to obtain a third reaction system with the acid value being 28 to 35 mg KOH/g and the viscosity being 5000 to 15000 mPa.s; mixing the third reaction system and an antioxidant, and cooling and discharging, so as to obtain the long-term anti-yellowing polyester resin. Through the adoption of the method, the polyester resin with long-term anti-yellowing property can be obtained, is used for preparing white system powder coating, and has a wide application prospect in the field of white household appliances.

Description

technical field [0001] The invention belongs to the field of coatings, in particular, the invention relates to a long-acting anti-yellowing polyester resin and a preparation method and application thereof. Background technique [0002] Due to its solvent-free, recyclable, environmental protection, energy and resource saving, and high mechanical strength of the coating film, powder coatings have developed rapidly and are widely used in home appliances, automobiles, aluminum alloy doors and windows, and other metal and non-metal surface decoration protection. At the same time, with the rapid development of social economy in recent years, various new types of powder coating products have been introduced to the market to meet the needs of different application scenarios. On this basis, functional powders such as antibacterial, easy-to-clean, and heat-resistant The development and application of coating products has gradually become the development direction of powder coatings. ...

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Problems solved by technology

[0003] At present, the high-temperature-resistant powder coatings on the market are mainly fluorocarbon and silicone powder coatings, but the price of these two coatings is relatively high, the adhesion to the substrate is poor, and the preparation process is complicated, so the application has been widely accepted. In addition, due to the poor hiding power of light-colored paints and the difference in sensory contrast, even small yellowing will become quite obvious. In order to better cover the coating, continuous Yellowing at high temperature produces small color difference changes. Most of these high-temperature-resistant powder coatings are made into dark-colored systems (such as black), but the decorative protection effect is poor

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