摘要
采用不同配比的甲苯二异氰酸酯(TDI)和聚四氢呋喃二醇(PTMG)合成了系列含不同游离TDI单体的预聚物,经分子蒸馏装置处理得到了低游离TDI预聚物,并以此制备了浇注型聚氨酯弹性体(CPU)。讨论了n(TDI)∶n(PTMG)对低游离预聚物中NCO含量和最终CPU力学性能和动态力学性能的影响。结果表明,n(TDI)∶n(PTMG)为4∶1时,CPU综合性能最佳,硬度为邵A 95,拉伸强度为44.4 MPa,断裂伸长率为414%,撕裂强度达到126.7 k N/m,压缩永久变形为26.9%。
A series of prepolymers containing different content of free TDI monomers were synthesized by using toluene diisocyanate( TDI) and polytetrahydrofuranediol( PTMG) at different ratios,then the low free TDI prepolymers were obtained by molecular distillation,and the cast polyurethane elastomer( CPU) was prepared. The effects of n( TDI) ∶n( PTMG) on the NCO content in the low free TDI prepolymer and the mechanical/dynamic mechanical properties of the CPU were discussed. The results showed that,when n( TDI) ∶n( PTMG) was 4 ∶1,the comprehensive properties of CPU was the best,the hardness was 95 shore A,the tensile strength was 44. 4 MPa,the elongation at break was 414%,the tear strength was 126. 7 k N/m,and the compression set was 26. 9%.
作者
边祥成
张银柱
刘冰肖
党海春
李振中
BIAN Xiangcheng;ZHANG Yinzhu;LIU Bingxiao;DANG Haichun;LI Zhenzhong(Department of Materials Engineering,Taiyuan Institute of Technology,Taiyuan 030008,Shanxi,China)
出处
《聚氨酯工业》
CAS
2021年第2期21-23,共3页
Polyurethane Industry
基金
山西省应用基础研究计划-青年科技研究基金项目(201901D211456)
山西省高校科技创新基金项目(2019L0927)。
关键词
TDI预聚物
NCO含量
聚氨酯弹性体
动态力学性能
TDI⁃based prepolymer
the content of NCO
polyurethane elastomer
dynamic mechanical property
