涂料用环氧改性聚酯型水性聚氨酯的合成  

Synthesis of Polyester-Type Waterborne Polyurethane Modified by Epoxy for Coatings

作　　者：汤旸[1] 赖慧颖[1] 王伟烽 汤胜会 朱广军[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《广东化工》2016年第9期6-8,3,共4页Guangdong Chemical Industry

基　　金：国家级高等学校大学生实践创新训练计划资助项目(201510288019)

摘　　要：选用内聚能大的聚酯多元醇做软段,双酚A型环氧树脂为改性剂制备聚酯型水性聚氨酯。通过红外光谱跟踪（FT-IR）证明了环氧基的开环,探讨了环氧改性的机理;并通过粒径分析仪、接触角仪和热重分析仪（TGA）对乳液及涂膜进行了表征。结果表明：DMPA用量为6%,n（-NCO）：n（-OH）为1.5：1,环氧树脂的环氧值为0.2或0.43,用量为6%~8%时,乳液外观及稳定性好,平均粒径为26.47 nm;涂膜硬度达2 H,拉伸强度可达46.23 MPa,吸水率仅为2.4%,初始分解温度提高54℃;综合性能优异,可作为高档涂料用树脂,应用于多领域。Polyester-type waterborne polyurethane emulsion（WPU）was prepared by polyester-polyol with big cohesive energy as soft segment and bisphenol a type epoxy resins as modifier.Ring opening of the epoxy group was demonstrated by infrared spectroscopy（FT-IR）tracking and the epoxy-modified mechanism was discussed; and the emulsion and the film were characterized through the particle size analyzer, automatic contact angle meter rand thermo gravimetric analyzer（TGA）. The results show that the emulsion has good appearance and stability when DMPA dosage is 6 %, n（-NCO）：n（-OH）is 1.5：1, the epoxy value of epoxy resin is 0.2 or 0.43 and the dosage is 6 %~8 %, at the same time, the average particle size is 26.47 nm, coating hardness is up to 2 H, the tensile strength is 46.23 MPa, water uptake is only 2.4 % and the temperature of beginning to decompose improves 54 ℃. The polyester-type waterborne polyurethane emulsion can be used as a high-grade paint, applied in many fields.

关 键 词：聚酯型水性聚氨酯 环氧开环 改性 热重分析 高档涂料 

分 类 号：TQ316.6[化学工程—高聚物工业]