纳米SiO2改性水性聚脲的制备与性能  

Preparation and properties of nano-SiO2 modified waterborne polyurea

作　　者：王伟烽 李根 李培礼 朱广军[1] WANG Weifeng;LI Gen;LI Peili;ZHU Guangjun(School of Chemical Engineering,Nanjing University of Science&Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《精细化工》2020年第5期955-961,共7页Fine Chemicals

摘　　要：采用纳米二氧化硅(SiO2)为改性剂,以异佛尔酮二异氰酸酯(IPDI)、聚醚胺(D2000)、二羟甲基丙酸(DMPA)、乙二胺(EDA)、3-氨丙基三乙氧基硅烷(KH550)以及三乙胺(TEA)为主要原料,通过溶胶-凝胶法制备了纳米SiO2改性水性聚脲。利用FTIR、TEM、SEM、TGA等对聚合物结构与性能进行了表征与测试,并且研究了纳米SiO2含量(纳米SiO2占IPDI、D2000、DMPA、EDA、KH550、TEA总质量的百分比,下同)对水性聚脲乳液和涂膜性能的影响。结果表明:随着纳米SiO2含量的增加,水性聚脲乳液的粒径增大,黏度变大,涂膜的吸水率降低,拉伸强度先变大后变小,接触角变大和断裂伸长率降低。当体系中纳米SiO2质量分数为2.0%时,涂膜的综合性能最佳,吸水率和水接触角分别为11.12%、75.24°;改性后的涂膜相比未改性的涂膜热分解温度提高10℃左右。A series of nano-silica(SiO2) modified waterborne polyurea emulsions were prepared by sol-gel method using isophorone diisocyanate(IPDI), polyether amine(D2000), dimethylolpropionic acid(DMPA), ethylenediamine(EDA), 3-aminopropyl triethoxysilane(KH550), and triethylamine(TEA) as main raw materials, nano-silica as modifier. The structure and properties of the polymers were characterized by FTIR, TEM, SEM and TGA. The effects of nano-SiO2 content(the percentage of nano-SiO2 in the total mass of IPDI、D2000、DMPA、EDA、KH550、TEA, the same below) on the properties of the waterborne polyurea emulsions and films were studied. The results showed that with the increase of nano-SiO2 content, the particle size and viscosity of waterborne polyurea emulsion increased, the water absorption of the coating decreased, the tensile strength increased first and then decreased, the contact angle increased and the elongation at break decreased. When the content of nano-SiO2 was 20%, the prepared coating exhibited the best comprehensive performance, the water absorption and the contact angle were 11.12% and 75.24°, respectively. Moreover, the thermal decomposition temperature of the modified coating was higher about 10 ℃ than that of the unmodified coating.

关 键 词：溶胶-凝胶法 纳米二氧化硅 水性聚脲 改性 涂膜 功能材料 

分 类 号：TQ630[化学工程—精细化工]