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采用二苯基二羟基硅烷(DPDS)与钛酸正丁酯(TBT)合成硅钛预聚物,将硅钛预聚物与环氧树脂接枝反应,制备硅钛环氧树脂。利用IR光谱对有机硅钛改性环氧树脂的结构进行表征。研究了不同硅钛含量环氧/聚酰胺固化体系的粘接性能;利用DSC、TG研究了硅钛含量对硅钛环氧固化体系固化反应温度、热失重温度影响;利用DMA、SEM对硅钛改性环氧树脂体系相态结构进行了分析。结果表明:硅钛树脂会对环氧树脂产生较好增韧作用,硅钛改性树脂固化物的粘接性能、耐水性能、耐热老化性能和高温残炭率都有明显提高。
The titanosilicate prepolymer was synthesized by diphenyl dihydroxy silane (DPDS) and n-butyl titanate (TBT), and the titanosilicate epoxy resin was prepared by grafting the titanocene prepolymer with epoxy resin. The structure of organosilicon titanium modified epoxy resin was characterized by IR spectra. The adhesive properties of epoxy / polyamide with different content of silicon and titanium were studied. The effect of the content of silicon and silicon on curing temperature and weight loss temperature was studied by DSC and TG. The phase structure of the modified epoxy resin system was analyzed. The results show that the silicon-titanium resin has a good toughening effect on the epoxy resin, and the adhesive properties, water resistance, heat aging resistance and high temperature carbon residue rate of the cured titanium-silicon modified resin are obviously improved.