软段和硬段对混炼型聚氨酯弹性体力学性能的影响  

Influence of soft segment and hard segment on mechanical properties of millable polyurethane elastomer

作　　者：崔胜恺 吕小健 沈照羽 徐祥 李廷廷 刘锦春[1] CUI Shengkai;LÜXiaojian;SHEN Zhaoyu;XU Xiang;LI Tingting;LIU Jinchun(Key Laboratory of Rubber-Plastic,Ministry of Education,Qingdao University of Science & Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学橡塑材料与工程教育部重点实验室,山东青岛266042

出　　处：《弹性体》2020年第5期1-5,共5页China Elastomerics

基　　金：山东省重点研发计划项目(92019GGX102044);山东省重大工程创新工程项目(2019JZZY020204)。

摘　　要：基于二苯基甲烷二异氰酸酯(MDI)体系,采用一步法合成聚氨酯弹性体生胶,再混炼加工制备出混炼型聚氨酯弹性体(MPU)。研究了多元醇种类及相对分子质量、硬段用量对MPU性能的影响。结果表明,采用相对分子质量为1000的聚碳酸酯二醇(PCDL1000)作为软段,硬段质量分数为35%时,MPU的耐磨性最好,拉伸强度、撕裂强度和邵尔A硬度最大;采用相对分子质量为1000的聚四氢呋喃醚二醇(PTMG1000)作为软段,硬段质量分数为35%时,分子链的柔顺性最好,MPU的邵尔A硬度适中,综合力学性能最佳;随着硬段含量的增加,MPU的耐磨性增强。Based on the system of diphenyl methane diisocyanate(MDI),the polyurethane elastomer raw rubber was synthesized by one-step method,and then the millable polyurethane elastomer(MPU)was prepared by mixing and processing.The effects of polyol type,polyol molecular weight and hard segment content on the properties of millable polyurethane elastomer were studied.The results showed that when PCDL1000 was used as the soft segment and the hard segment content was 35%,MPU had the best wear resistance,the greatest tensile strength,tear strength and hardness.When PTMG1000 was used as the soft segment and the hard segment content was 35%,the molecular chain flexibility was the best,and the hardness of MPU was moderate,and the comprehensive mechanical properties of MPU were the best.With the increase of hard segment content,the wear resistance of MPU increased.

关 键 词：混炼型聚氨酯弹性体 硬段含量 力学性能 耐磨性能 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]