涂料用有机硅、环氧复合改性水性聚氨酯的制备  

Preparation of waterborne polyurethane modified by epoxy and aminosilane for coating

作　　者：汤胜会 刘笑妍[1] 李鹏浩[1] 丁志伟[1] 朱广军[1] 

机构地区：[1]南京理工大学化工学院,南京210094

出　　处：《化工新型材料》2015年第12期85-87,91,共4页New Chemical Materials

基　　金：江苏省高等学校大学生实践创新训练计划资助项目

摘　　要：选用异佛尔酮二异氰酸酯（IPDI）、聚己二酸1,4-丁二醇酯（PBA）、二羟甲基丙酸（DMPA）、1,4-丁二醇（BDO）为主要原料,用双酚A型环氧树脂和氨基硅烷复合改性制备水性聚氨酯。研究了体系中n（—NCO）∶n（—OH）、DMPA用量、环氧树脂与氨基硅烷的配比对乳液及涂膜的影响,并通过傅里叶红外光谱仪、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：n（—NCO）∶n（—OH）为1.5∶1,DMPA用量为5%-7%,环氧树脂添加量为8%,氨基硅烷的用量为4%时,乳液外观及稳定性好,平均粒径为24.56nm;涂膜硬度达2H,吸水率仅为2.3%,耐热性显著提高;综合性能优异,可作为防腐蚀涂料用树脂,应用于多领域。Waterborne polyurethane emulsion（WPU）was prepared using isophorone diisocyanate（IPDI）,poly-1,4-butylene adipate glycol（PBA）,2,2-dimethylol propionic acid（DMPA）,1,4-butanediol（BDO）as main raw material,with bisphenol A epoxy resin and aminosilane as modifiers.The effect of the value of n（—NCO）∶n（—OH）,DMPA content and the content ratio of epoxy to aminosilane on emulsion and coating performance were investigated.The emulsion and coating performance were characterized through infrared spectroscopy（FT-IR）,particle size analyzer,automatic contact angle meter and thermogravimetic analyzer（TGA）.The results showed that the emulsion had good appearance and stability when n（—NCO）∶n（—OH）was 1.5∶1,DMPA dosage was 6%-7%,the dosage of epoxy was 8%and the dosage of aminosilane was 4%.At the same time,the average particle size was 24.56 nm,coating hardness was up to 2H,water uptake was only2.3% and heat resistance was improved significantly.The composite modified waterborne polyurethane emulsion can be used as high-grade anticorrosive coating and applied in many fields.

关 键 词：水性聚氨酯 环氧树脂 氨基硅烷 复合改性 防腐蚀涂料 

分 类 号：TQ630.4[化学工程—精细化工]