Weather resistance powder coating

Abstract

The invention discloses a weather resistance powder coating, comprising the following components: 35%-45% of hydroxylated acrylic resin with a hydroxyl value of 35-45mg / a, 30%-35% of terminal carboxy polyester resin with a acid value of 60-70mg KOH / g, 3%-5% of tetramethoxy methyl glycoluril, 0.5%-1.3% of acrylic type flatting agent, 20%-30% of barium sulfate, and 0.5%-1.5% of benzoin. The weather resistance of the powder coating of the invention is greatly improved, 480h QUV-B(accelerated photo-ageing test) gloss retention of the powder coating is increased from 50% which is the gloss retention of the traditional polyester powder coating to 95% so that the outdoor high weather resistance coating requirements can be satisfied; the cost of the invention is lower than that of fluorocarbon resin powder coating and organosilicon resin powder coating (the cost can be reduced by about 50%).

Description

technical field

[0001] The invention relates to a weather-resistant powder coating. Background technique

[0002] At present, the weather-resistant powder coatings used for coating metal materials are mainly polyester and polyurethane powder coatings. Although they have certain weather resistance properties, they cannot meet the high weather resistance coating requirements for outdoors. In addition, weather-resistant powder coatings include fluororesin powder coatings and silicone resin powder coatings, but these two types of weather-resistant powder coatings have high resin costs, immature technology, and high production conditions.

[0003] Therefore, in order to meet the needs of weather resistance and low cost, it is urgent to develop a weather resistant powder coating that can meet the coating requirements of outdoor high weather resistance and low production cost. Contents of the invention

[0004] The technical problem to be solved by the present invention is to pr...