双组分聚氨酯密封胶的制备与性能研究

Miao Chen,Yelin Yin,Yaqiong Liu,Liqing Yue,Hongyang Gong,Junshi Kong

China Adhesives（2016）

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Abstract

以聚醚多元醇和4,4'-二苯基甲烷二异氰酸酯(MDI)为主要原料,制备了双组分PU(聚氨酯)密封胶,并优选了端-NCO基预聚体的合成条件.研究结果表明:当n(3官能度聚醚多元醇)∶n(2官能度聚醚多元醇)=1.2∶1.0时,加入MDI后,70～75℃反应4h,可得到w(-NCO)=4.5％的端-NCO基预聚体;当A组分、B组分按照R=n(-NCO)∶n(—0H)=1.1∶1～1.4∶1配比混合均匀时,制得的PU密封胶具有良好的粘接性能和热稳定性.

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