PEG/PTMG共聚醚型聚氨酯弹性体制备工艺的研究

Research on preparation process for PEG/PTMG copolymerized polyether-polyurethane elastomer

以聚乙二醇(PEG)和聚四氢呋喃醚二醇(PTMG)为软段、1,6-六亚甲基二氨基甲酸甲酯(HDC)为硬段、二月桂酸二丁基锡(DBTDL)为催化剂、1,4丁二醇为扩链剂,采用酯交换缩聚法制备共聚醚型聚氨酯弹性体(CEUs)。通过一系列单因素对比实验,探讨了物料配比、预聚温度、预聚时间、缩聚温度和缩聚时间等对聚氨酯弹性体力学性能的影响。结果表明,在物料配比n(PTMG+PEG)∶n(HDC)∶n(BDO)=1.0∶0.9∶0.1、预聚温度为130℃、预聚时间为45 min、缩聚温度为175℃、缩聚时间为180 min的条件下,聚氨酯弹性体的断裂拉伸强度为61 MPa,断裂拉伸率为2718%。

Copolymerized polyether-polyurethane elastomers（CEUs） are prepared by a transesterfication polycondensation method with polyethylene glycol（PEG） and polyoxytetramethylene glycol（PTMG） as soft segments,methyl 1,6-hexamethylene-dicarbamate（HDC） as hard segment,dibutyltin dilaurate（DBTDL） as catalyst and 1,4-butanediol（BDO） as chain extender. The effects of materials＇ ratio,pre-polymerization temperature,pre-polymerization time,polycondensation temperature and polycondensation time on the mechanical properties of as-prepared CEUs are investigated by a series of single factor contrast experiments.The results show that the optimum conditions are as follows：n（PTMG＋PEG） ∶ n（HDC） ∶ n（BDO） = 1. 0 ∶ 0. 9 ∶ 0. 1,pre-polymerization temperature at 130℃,pre-polymerization time for 45 min,polycondensation temperature at 175℃ and the polycondensation time for 180 min. Under the optimum conditions,the prepared CEUs has a tensile strength at break of 61 MPa,and a breaking elongation of 2 718%.