聚氨酯改性环氧树脂的研究

Study on the modification of epoxy resin with polyurethane

用原位聚合法制备了聚氨酯/环氧树脂复合材料,考察了不同因素对刚性聚氨酯/环氧树脂复合材料力学性能的影响。结果表明,在所得复合材料中,当聚氨酯含量不高时,其冲击强度、拉伸强度和耐热稳定性能同时得到提高;若刚性聚氨酯含量超过一定范围,材料的拉伸强度逐渐降低。比较了聚酰胺、咪唑、三乙胺、三乙烯二胺四种固化剂的固化效果,结果表明,聚酰胺固化效果最好,咪唑的固化效果次之,三乙胺固化改性后的力学性能较差,而三乙烯二胺不能完全固化聚氨酯/环氧树脂复合材料。制得了拉伸强度为54.6MPa,冲击强度为12.025KJ.m-2的高韧性聚氨酯/环氧树脂复合材料。

In this paper, the PU/EP compound material has been prepared with the method of the situ- polymerization. And the influence of different factors has been examined on the properties of the PU/EP compound material. The results show that when the amount of polyurethane was lower, the resistance to impact strength, tensile strength and thermal stability were better. But when the amount of polyurethane exceeds a certain scope, the tensile strength decreases with the increase of impact strength. By comparing the solidification effects among four kinds of curing agents which are polyamide, imidazole, triethamine, trithlenedianfine, the results show that the polyamide＇ s solidification effects is best, the mechanics properties are not good after being modified by using triethylamine as solidification agent and the triethlenediamine can＇t completely solidify the compound material. The strong tenacity PU/EP compound materials whose emile strength and impact strength are 54. 6MPa and 12.025KJ·m^-2 respectively have been prepared.