Abstract: In order to prepare ultra-durable dry mixed matting powder coatings withexcellent mechanical properties，the structures of high-and low-acid value polyesters weredesigned to improve the flexibility and surface hardness of ultra-durable low-gloss coatings.Hydrogenated bisphenol A（HBPA）was introduced into the high acid value polyester，which was combined with specific linear polyols and aliphatic cyclic polyacids. Meanwhile，monomers such as 2，2-dimethyl-1，3-propanediol hydroxyvalerate monoester（HPN） and aliphatic cyclic polyacids were added to the low acid value polyester，and long-chain fatty acids wereused as capping agents. The results show that the powder coating，prepared by combining high-and low-acid value polyesters and cured at 200 ℃/10 min（TGIC curing agent）， can achieve a coating gloss of 17 to 25，and indicate excellent surface hardness（3H）and toughness（bending 1T，recoil 50 cm）， and also possesses outstanding weather resistance（600 h，gloss retention 65%-75%）and boiling water resistance（10 h，gloss retention 205. 5%）.

Key words: polyester resin, powder coatings, ultra-durable, dry mixed matting, flexibility

摘要： 为制备机械性能优异的超耐候干混消光粉末涂料，通过设计不同高、低酸值聚酯结构，以改善超耐候低光涂膜的柔韧性和表面硬度。在高酸值聚酯中引入氢化双酚 A（HBPA）并与特定线型多元醇和脂肪族环状多元酸配合使用。同时，在低酸值聚酯中添加 2，2-二甲基 .1，3-丙，二醇羟基特戊酸单酯（ HPN）和脂肪族环状多元酸等单体，并采用长链脂肪酸作为封端剂。结果表明：高、低酸值聚酯搭配制备的粉末涂料在 200 ℃/10 min（TGIC固化剂）条件下固化，涂膜光泽可达 17~25，拥有优异的表面硬度（ 3H）及韧性（ T弯 1T、反冲 50 cm），同时具备出色的耐候性（ 600 h，保光率65%~75%）和耐沸水性（ 10 h，保光率 205. 5%）。

关键词: 聚酯树脂, 粉末涂料, 超耐候, 干混消光, 柔韧性

CLC Number: 

• TQ637. 82