有机硅钛改性环氧树脂的制备及粘接性能研究

Study on Preparation and Adhesive Properties of Epoxy Resins Modified by Silicon and Titanium

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 titanium silicon epoxy resin was prepared by grafting reaction of epoxy resin with titanium silicon prepolymer, which was synthesized by tetrabutyl titanate （TBT） and diphenyl silanediol （DPDS）. The structure of epoxy resin modified by silicone was characterized by IR spectroscopy. The effects of different silicon/titanium content on the bonding properties of the epoxy/polyamide system were investigated. The effect of different silicon/titanium content on the curing temperature and the weight loss temperature of the modified epoxy/polyamide system were studied by DSC and TG test. The phase structure of epoxy resin system modified by Si-Ti was analyzed by DMA and SEM. The results showed that the titanium silicon resin had good toughening function on epoxy resin, and the modified epoxy/polyamide system had higher bonding properties, water resistance, heat aging resistance and char yield of high temperature.