聚氨酯-环氧树脂弹性体的合成

Synthesis of Polyurethane-epoxy Elastomer

首先由聚醚(PPG)和甲苯二异氰酸酯(TDI)反应制得含有端异氰酸酯的预聚体,利用预聚体中的异氰酸酯基团与环氧树脂上的仲羟基反应合成端环氧基团的聚氨酯-环氧树脂,然后用低分子聚酰胺固化。通过改变预聚体中PPG3031含量和NCO/OH的比值得到不同的拉伸强度和硬度。实验结果表明:随着预聚体中PPG3031含量的增大,弹性体的拉伸强度增大,硬度也增大;随着预聚体中NCO/OH摩尔比的提高,弹性体的拉伸强度和硬度增大,断裂伸长率变化不大。

Polyurethane prepolymer with isocyanate - terminated was prepared by PPG and toluene diisoeyanante （ TDI）, then epoxy - terminated polyurethane - epoxy resin were prepared by polyurethane prepolymer and epoxy resin , and curing with low - molecular polyamide. Different tensile strength and hardness was obtained by changing NCO/OH or PPG3031/2020 of polyurethane prepolymer. The result showed that the tensile strength and hardness enhanced with the increase of PPG3031/2020 or NCO/OH in polyurethane prepolymer.