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使用聚乙二醇与聚丙二醇的共聚物(PEG-PPG)和二苯基甲烷二异氰酸酯(MDI)为原料,在催化剂的存在下合成末端有异氰酸酯基的反应性聚氨酯。该反应性聚氨酯在催化剂XCT-cat57及固化促进剂XCT-cat37的存在下,再与一种低黏度双酚A型环氧树脂按不同的比例混合,由此组成了低黏度环氧树脂/反应性聚氨酯固化体系。研究了低黏度共混物的黏结效果,评价了其固化物的黏结强度。研究结果显示,当m(环氧树脂6002):m(反应性聚氨酯)等于50:50时,共混树脂固化物具有最佳的力学性能。
Using a polyethylene glycol-polypropylene glycol copolymer (PEG-PPG) and diphenylmethane diisocyanate (MDI) as raw materials, an isocyanate-terminated reactive polyurethane is synthesized in the presence of a catalyst. The reactive polyurethane is mixed with a low viscosity bisphenol A type epoxy resin in the presence of the catalyst XCT-cat 57 and the curing accelerator XCT-cat37 in different proportions to form a low viscosity epoxy resin / reaction Polyurethane curing system. The adhesion of low viscosity blends was studied, and the adhesive strength of the cured products was evaluated. The results show that when m (epoxy 6002): m (reactive polyurethane) is equal to 50:50, the cured resin has the best mechanical properties.