材料期刊网

以甲苯二异氰酸酯(TDI-80)、聚醚二元醇(GE-210)、二羟甲基丙酸(DMPA)、甲基丙烯酸甲酯(MMA)等为主要原料,以环氧树脂(CYD-014)为预交联剂,以甲基丙烯酸缩水甘油酯(GMA)为后交联剂,采用预聚体法,合成了具有双重交联结构的PUEA复合乳液.研究了后交联剂 GMA用量对乳液和涂膜性能的影响及交联固化工艺条件.结果表明,GMA的用量对PUEA乳液及涂膜性能有重要影响.当 GMA 用量为3％时,乳液外观和稳定性好,烘烤成膜的涂膜吸水率和吸乙醇率最低,硬度和耐冲击性能优异,防腐性能最佳；加入 GMA的后交联PUEA涂膜性能与成膜温度及烘烤时间有密切关系；适宜的成膜条件为150℃/20 min.

A double crosslinking PUEA emulsion which was used for metal anti-corrosion was successfully syn-thesized by pre-polymerization method using CYD-014 as pre-crosslinking agent,GMA as post crosslinking a-gent,and TDI,GE-210,DMPA,MMA as the main raw materials.The effects of the GMA content on the prop-erties of the emulsion and the film were discussed.Additionally the crosslinking curing process of the film was researched.Experimental results showed that the dosage of GMA had an important effect on the properties of PUEA emulsion and film.The emulsion had good performance and stability when the GMA content was 3%. The baking film was endowed with excellent hardness,impact resistance,and the anticorrosion performance. Meanwhile the film had the lowest rate of water and ethanol absorption.The film properties of the post crosslinking PUEA were closely related to the baking temperature and baking time.The suitable film forming condition was 150 ℃/20 min.