Polyurethane system extinction outdoor weather-resistant powder coating

The invention discloses a polyurethane system extinction outdoor weather-resistant powder coating. The powder coating comprises the following raw materials: a high-acid-value semi-crystalline carboxylpolyester resin, a random hydroxyl polyester resin, a first curing agent and a second curing agent, wherein the first curing agent is an isocyanate curing agent, and the second curing agent is at least one selected from the group consisting of a glycidyl isocyanurate curing agent and a hydroxyalkyl amide curing agent. According to the invention, the gloss of the powder coating is effectively controlled to be in a range from dead light to semi-light, and the powder coating has the advantages of stable extinction effect, favorable outdoor weather resistance and favorable storage stability. 本发明公开了一种聚氨酯体系消光户外耐候性粉末涂料，其原料包括：高酸值半结晶羧基聚酯树脂、无规羟基聚酯树脂、第一固化剂、第二固化剂，其中，第一固化剂为异氰酸酯固化剂，第二固化剂为异氰尿酸缩水甘油酯类固化剂、羟烷基酰胺类固化剂中的至少一种。本发明能够实现对光泽范围从"死光"到"半光"的有效控制，且消光效果稳定，同时具有很好的户外耐候性能和储存稳定性。