聚醚型吸水膨胀聚氨酯弹性体的合成

摘要

采用亲水性聚醚多元醇(PPE)与甲苯二异氰酸酯(TDI)反应的预聚体,与混合扩链剂制备了吸水膨胀聚氨酯弹性体.实验结果表明:当聚乙二醇醚( PEG)与聚丙二醇醚(PPG)的物质的量比为6∶4,PEG相对分子质量为2 000,预聚体中异氰酸酯基(-NCO)的质量分数为5.2％;采用混合扩链剂,且1、4-丁二醇与丙三醇的物质的量比为2∶1,增塑剂邻苯二甲酸二辛酯(DOP)的质量分数控制在8％时,制备的聚氨酯弹性体吸水膨胀率高,综合性能良好.%The water swelling polyurethane elastomers were synthesized by the method of prepoly-mer based on special polyether polyols, toluene diisocyanate(TDI)and composite chain extenders. The result showed that the polyurethane elastomers had excellent water swelling performance and synthetic properties when PEG/PPG was 6/4 (molar ratio), molecular weight of polyethylene glycol was 2 000,the compound chain extenders by BDO and GlyceroKthe molar ratio was 2 : 1),the percentage of -NCO in prepolymcr was 5. 2%,the percentage of DOP in elastomers was 8%.