异氰酸酯指数对水性聚氨酯弹性膜性能的影响  

Effect of isocyanate index on properties of waterborne polyurethane elastic film

作　　者：刘凯 姚明[1] 魏欣[1] 张均[1] 陈建君[1] 姜志国[1] LIU Kai;YAO Ming;WEI Xin;ZHANG Jun;CHEN Jian-jun;JIANG Zhi-guo(College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《现代化工》2020年第12期177-180,共4页Modern Chemical Industry

摘　　要：以二环己基甲烷-4,4’-二异氰酸酯(HMDI)为硬段、聚四氢呋喃醚二醇(PTMEG3000)为软段、2,2-二羟甲基丙酸(DMPA)为亲水扩链剂,采用预聚体法合成了水性聚氨酯(WPU)。通过FT-IR分析、拉伸试验和吸水率测定等研究了异氰酸酯指数(R值)对WPU弹性膜氢键化程度、力学性能和耐水性能的影响。结果表明,随着R值增加,WPU弹性膜的力学性能和耐水性能提高,当R值为1.15时,WPU弹性膜具有低模量、较高的力学性能和耐水性能。Waterborne polyurethane( WPU) is prepared through pre-polymerization method by using methylene-bis( 4-cyclohexylisocyanate)( HMDI) as the hard segment,polytetramethylene ether glycol( PTMEG3000) as the soft segment,and 2,2-bis( hydroxymethyl) propionic acid as the hydrophilic chain extender.The effects of isocyanate index( R value) on the hydrogen bonding degree,mechanical properties and water resistance of WPU elastic films are studied by FT-IR analysis,tensile test and water absorption rate.The results show that both mechanical properties and water resistance of WPU elastic films increase with the increase of R value.WPU elastic film shows a low modulus,and suitable mechanical properties and water resistance when R value equals to 1.15.

关 键 词：异氰酸酯指数 水性聚氨酯 弹性膜 氢键化程度 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]