环氧硅油改性聚天冬氨酸酯聚脲的合成及性能研究

Study on synthesis and performance of epoxy silicone oil modified polyaspartate polyurea

采用双端环氧基聚硅氧烷改性,通过端氨基聚醚(D200)与端环氧基发生开环反应将聚硅氧烷(PDMS)接枝到主链上再和马来酸二乙酯的Michael加成反应,合成了有机硅改性聚天冬氨酸酯(PAE-S)。将PAE-S与(4.4、二环己基甲烷二异氰酸酯)HMDI预聚体常温聚合,制备了有机硅改性聚天冬氨酸酯(PAE-S)聚脲,并通过改变投料比合成了不同硬段含量的聚脲。通过实验结果发现,采用有机硅改性后,聚脲的耐高温性有不同程度的改善,且硬段含量在12.8%时聚脲的断裂伸长率最大,也表现出了较好的柔韧性。

In this paper,double-end epoxy polysiloxane is used to modify,and through the ring-opening reaction of amino-terminated polyether(D200)and epoxy-terminated groups,PDMS is grafted to the main chain and then added with Michael of diethyl maleate.Through the reaction,the silicone modified polyaspartate(PAE-S)is synthesized.PAE-S and(4.4,dicyclohexylmethane diisocyanate)HMDI prepolymer are polymerized at room temperature to prepare silicone-modified polyaspartate(PAE-S)polyurea,which is synthesized by changing the feed ratio.Through the experimental results,it is found that the high temperature resistance of polyurea has been improved to different degrees after modification with silicone,and the elongation at break of polyurea is the largest when the hard segment content is 12.8%,which also shows better flexibility.