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以γ-环氧丙氧基三甲氧基硅烷(KH-560)与磷酸反应合成了一种含磷硅烷偶联剂,将这种含磷硅烷偶联剂与硅溶胶按一定配比进行水解缩聚反应,得到一种硅磷杂化物,将该硅磷杂化物引入到双酚A环氧树脂(E-51),以4,4′-二氨基二苯基甲烷为固化剂,制备了硅磷杂化物/环氧树脂固化物。对该固化物的玻璃化转变温度、热失重、拉伸强度、极限氧指数(LOI)进行了测试。结果表明,该固化物玻璃化转变温度,700℃残炭量以及LOI均比纯环氧树脂固化物高,拉伸强度却下降较少。当硅磷杂化物的添加量占环氧树脂质量的50%时,该固化物的玻璃化转变温度可以达到178℃,极限氧指数可以达到28.2,与纯环氧树脂固化物相比,分别提高了18℃和25%。与纯环氧树脂固化物相比,该硅磷杂化物/环氧树脂固化物具有较好的阻燃性及热稳定性。
A phosphorus-containing silane coupling agent was synthesized by reacting γ-glycidoxy trimethoxysilane (KH-560) with phosphoric acid. The phosphorus-containing silane coupling agent and the silica sol were hydrolyzed and condensed at a certain ratio To obtain a silicon-phosphorus hybrid. The silicon-phosphorus hybrid was introduced into a bisphenol A epoxy resin (E-51), and 4,4’-diaminodiphenyl methane was used as a curing agent to prepare silicon-phosphorus Hybrid / Epoxy cured. The glass transition temperature, weight loss, tensile strength, limiting oxygen index (LOI) of the cured product were tested. The results show that the glass transition temperature of the cured product, the carbon residue at 700 ℃ and the LOI are higher than those of the pure epoxy resin, but the tensile strength decreases less. When the amount of silicon-phosphorus hybrid added to 50% of the mass of epoxy resin, the glass transition temperature of the cured product can reach 178 ℃, the limit oxygen index can reach 28.2, compared with the pure epoxy cured resin, respectively, increased 18 ° C and 25%. Compared with a pure epoxy cured product, the silicon-phosphorus hybrid / epoxy cured product has better flame retardancy and thermal stability.