NCO含量对PTMG体系聚氨酯弹性体的影响  

Effect of NCO Contents on Polyurethane Elastomer of PTMG System

作　　者：史中行 张建航 李侃旭 董子辉 苏威铭 李闯 刘锦春[1] SHI Zhong-hang;ZHANG Jian-hang;LI Kan-xu;DONG Zi-hui;SU Wei-ming;LI Chuang;LIU Jin-chun(Key Laboratory of Rubber-Plastic,Ministry of Education,College of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学高分子科学与工程学院橡塑材料与工程教育部重点实验室,山东青岛266042

出　　处：《塑料工业》2021年第8期27-31,共5页China Plastics Industry

基　　金：山东省重点研发计划项目(2019GGX102044);山东省重大工程创新工程项目(2019JZZY020204)。

摘　　要：以聚四亚甲基醚二醇-二苯基甲烷二异氰酸酯-1,4-丁二醇(PTMG-MDI-BDO)为基础体系,采用预聚体法,合成了异氰酸酯基(NCO)含量6%-9%的聚氨酯弹性体。通过改变预聚体中NCO含量,探究了其对制备的PTMG体系的聚氨酯弹性体综合性能的影响。结果表明,随着NCO含量的增加,材料的交联密度、硬度、拉伸强度、300%定伸应力和撕裂强度均呈现增加的趋势,且材料的耐磨性能变好,而其扯断伸长率和回弹性均下降,压缩永久变形率降低。NCO含量越高,材料的玻璃化转变温度升高,耐低温性能变差。Polyurethane elastomer with isocyanate group(NCO)contents of 6%-9%was synthesized by prepolymer method based on polytetramethylene ether glycol-diphenylmethane diisocyanate-1,4-butanediol(PTMG-MDI-BDO).By changing NCO contents in prepolymer,the influence of NCO contents on the comprehensive properties of polyurethane elastomer in PTMG system was investigated.The results show that with the increase of NCO contents,the crosslinking density,hardness,tensile strength,stress at 300%elongation and tear strength of the material all show an increasing trend,and the wear resistance of the material becomes better,while the elongation at break and resilience of the material decrease,and the compression set rate decreases.The isocyanate group contents are higher,the glass transition temperature T g of the material is higher,and the low temperature resistance is worse.

关 键 词：聚氨酯弹性体 异氰酸酯基含量 交联密度 玻璃化转变温度 

分 类 号：TQ334.9[化学工程—橡胶工业]