摘要
以多亚甲基多苯基异氰酸酯(PMDI)和聚醚二醇(PPG400)为原料,以不同结构的小分子三元醇为交联剂,合成了5种聚氨酯树脂。讨论了交联剂结构对聚氨酯固化放热、固化过程流变性能、热性能以及力学性能的影响。结果表明,交联剂分子结构中的仲羟基和苯环,使聚氨酯树脂的凝胶时间延长,耐热性和T;有小幅度提升。含长不饱和碳链的交联剂合成的聚氨酯活性降低,适用期大幅度增加,但硬段规整性差,T;和力学性能有所下降。以DIPA-PGE为交联剂时,T;最高为73.8℃;综合力学性能最佳的是MIPA-PGE,拉伸强度达到51.6 MPa。
Five kinds of polyurethanes resins(PU)were prepared with polymethylene polyphenyl isocyanate(PMDI)and polyether polyol and using small molecule ternary alcohols with different structures as crosslinker.The effects of crosslinker structure on heat release,rheological properties,thermal properties and mechanical properties of polyurethane were studied.The results showed that the secondary hydroxyl group and benzene ring in the molecular structure of the crosslinker prolonged the gelation time of the polyurethane resin,and slightly increased the heat resistance and T;.The activity of polyurethane synthesized by crosslinking agent containing long unsaturated carbon chain is decreased,and the applicable period is greatly increased,but the hard segment regularity is poor,and the T;and mechanical properties are decreased.When DIPA-PGE was used as crosslinker,the maximum T;was 73.8℃.MIPA-PGE had the best comprehensive mechanical properties,and the tensile strength reached 51.6 MPa.
作者
余凯
王钧
齐福敏
何川
YU Kai;WANG Jun;QI Fu-min;HE Chuan(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Zhongan Guangyuan Testing and Evaluation Technology Service Co,Ltd,Tianjin 300000,China)
出处
《复合材料科学与工程》
CAS
北大核心
2022年第5期85-91,109,共8页
Composites Science and Engineering
关键词
双组分聚氨酯
交联剂
流变性
适用期
复合材料
two-component polyurethane
crosslinker
rheological property
pot life
composites
