功能化石墨烯改性无胺型水性聚氨酯的制备  

Preparation of Functionalized Graphene Modified Amine-Free Waterborne Polyurethane

作　　者：刘佳慧 赖小娟[1,2] 王磊 张引引[1] LIU Jia-hui;LAI Xiao-juan;WANG Lei;ZHANG Yin-yin(Shaanxi Province Key Laboratory of Light Chemical Additives,Shaanxi University of Science & Technology,Xi'an 110021,Shaanxi,China;Shawvci Agricultural Products Processing Technology Research Institute,Xi'an 710021,Shaanxi,China)

机构地区：[1]陕西科技大学陕西省轻化工助剂重点实验室,陕西西安710021 [2]陕西农产品加工技术研究院,陕西西安710021

出　　处：《精细化工》2019年第6期1076-1083,共8页Fine Chemicals

基　　金：国家自然科学基金(51103081);陕西省工业科技攻关项目(2014K08-11和2016GY-241);陕西省教育厅重点实验室项目(17JS012);陕西省青年科技新星项目(2018KJXX-023);西安市科技计划项目(2017068C和201805024YD2CG8)~~

摘　　要：以聚己内酯二元醇(PCL)、甲苯二异氰酸酯(TDI)、甲基丙烯酸甲酯(MMA)为主要原料,合成水性聚氨酯-丙烯酸酯乳液(WPUA)预聚体。将偶联改性的纳米SiO2与氧化石墨烯进行接枝后,与聚氨酯-丙烯酸酯乳液预聚体进行原位聚合,用自乳化法制备了经功能化石墨烯改性的无胺型水性聚氨酯-丙烯酸酯复合乳液(SiO2-NH2-GO/WPUA),对功能化石墨烯的用量进行讨论,并对其复合乳液、胶膜结构及性能进行测试。与水性聚氨酯-丙烯酸酯(WPUA)相比,SiO2-NH2-GO/WPUA具有更好的耐温性及胶膜性能,当氧化石墨烯接枝SiO2(SiO2-NH2-GO)质量分数为0.75%时,复合乳液胶膜较未改性乳液胶膜相比,热分解温度提高14.51℃;拉伸强度提高到81.28 MPa;该复合乳液配制的胶黏剂在铝箔/PVC薄膜的T-剥离强度达到15.4 N;易氧化物含量指标符合药品包装容器标准,表明该水性聚氨酯胶黏剂适用于医药包装。A water-borne polyurethane-acrylate emulsion(WPUA) prepolymer was synthesized by using polycaprolactone diol(PCL), toluene diisocyanate(TDI) and methyl methacrylate(MMA) as main raw materials. After the coupling modified nano-SiO2 was grafted with graphene oxide, it polymerized with the polyurethane prepolymer in situ to prepare amine-free waterborne polyurethane-acrylate composite(SiO2-NH2-GO/WPUA) emulsions modified by functionalized graphene. The amount of functionalized graphene was discussed, and the composite emulsions and films were tested and characterized. Compared with waterborne polyurethane-acrylate(WPUA), SiO2-NH2-GO/WPUA had better temperature resistance and film properties. When the SiO2-NH2-GO mass fraction was 0.75%, the thermal decomposition temperature of the prepared SiO2-NH2-GO emulsion film was 14.51 ℃ higher than that of unmodified emulsion film. The tensile strength was increased to 81.28 MPa. The T-peel strength of the adhesive prepared by the composite emulsion in aluminum foil/PVC film reached 15.4 N. The indexes such as easy oxide met the standard of pharmaceutical packaging containers, indicating that this waterborne polyurethane adhesive was suitable for pharmaceutical packaging.

关 键 词：水性聚氨酯聚丙烯酸酯 氧化石墨烯 硅烷偶联剂 原位聚合 热分解 医药包装 功能材料 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]