摘要
以甲苯-2,4-二异氰酸酯、聚酯多元醇、二羟甲基丙酸、自制扩链剂为主要原料,利用预聚体法制备了对双向拉伸聚丙烯薄膜有较好附着力的新型水性聚氨酯乳液,考察了水性聚氨酯中软硬段含量对其稳定性、附着力、T剥离强度、力学性能及微相分离的影响。结果表明:随着m(—NCO)/m(—OH)的增加,所制水性聚氨酯的附着力和T剥离强度先增大后减小,拉断伸长率减小,拉伸强度增大。当m(—NCO)/m(—OH)为1.225时,所制水性聚氨酯的综合性能最佳。
A novel waterborne polyurethane emulsion featuring good adhesion for biaxially-oriented ten-sile polyethylene films was prepared via prepolymerization with toluene-2,4-diisocyanate, polyester polyols, 2,2-dimethylolpropionic acid and self-made chain-extender as main raw materials. The effects of soft and hard segment contents on stability, adhesion, T-peeling strength, mechanical properties and micro-phase separation of the waterborne polyurethane were explored. The results show that the adhesion and T-peeling strength of the waterborne polyurethane so prepared increase first and then decrease, while the elongation at break decreases and the tensile strength increases with increasing the mass ratio of isocyano-group to hydroxy. The waterborne polyurethane so obtained has the optimal comprehensive properties when the mass ratio is 1.225.
出处
《合成树脂及塑料》
CAS
北大核心
2014年第1期24-26,30,共4页
China Synthetic Resin and Plastics
基金
凯里学院重点课题项目(Z1203)
贵州省特色重点学科建设基金[黔教高发(2011)208号]
贵州省教育厅自然科学研究项目[黔教合KY字(2013)206]
关键词
水性聚氨酯
软硬段含量
微相结构
结晶
waterborne polyurethane
soft and hard segment contents
micro-phase structure
crystallization
