不需预保护羟基的侧链亲水非离子水性聚氨酯的制备与性能

Preparation and properties of side chain hydrophilic nonionic waterborne polyurethane without preprotective hydroxyl groups

以酒石酸与聚乙二醇单甲醚(MPEG)为原料,在不需预保护酒石酸中羟基的情况下,经过酯化反应合成了酒石酸聚乙二醇单甲醚酯(TMPEG),以其为亲水单体通过预聚体法制备了一系列非离子型水性聚氨酯(TWPU)乳液。通过1HNMR、FTIR、拉伸测试对TMPEG和TWPU进行了结构表征与性能测试。考察了亲水单体TMPEG质量分数对TWPU贮存稳定性、力学性能、吸水率的影响。结果表明:当TMPEG质量分数为24%(以TMPEG、聚己二酸-1,4-丁二醇酯二醇、异佛尔酮二异氰酸酯、三羟甲基丙烷、乙二胺的总质量为基准,下同)时,TWPU乳液平均粒径为85 nm,TWPU胶膜接触角为84°,拉伸强度为7.8 MPa,断裂伸长率为768%。

Polyethylene glycol monomethyl ether tartrate(TMPEG)was synthesized from tartaric acid and polyethylene glycol monomethyl ether(MPEG)by esterification reaction,in which the hydroxyl group in tartaric acid was not preprotected.Then,a series of nonionic waterborne polyurethane(TWPU)emulsions were prepared by prepolymer method using TMPEG as hydrophilic component.The structure and properties of TMPEG and TWPU samples were characterized by 1 HNMR,FTIR and tensile test.The effects of TMPEG mass fraction on the storage stability,mechanical properties,water absorption of TWPU samples were studied.The results showed that when the mass fraction of TMPEG was 24%(based on the total mass of TMPEG,polyadipate-1,4-butanediol ester diol,isophorone diisocyanate,trimethylpropane and ethylene diamine,the same below),the average particle size of the prepared TWPU emulsion was 85 nm,the contact angle,tensile strength,elongation at break of the TWPU film were 84°,7.8 MPa and 768%,respectively.