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以正硅酸乙酯(TEOS)为无机前驱体,γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)为硅烷偶联剂,采用溶胶-凝胶法制得纳米二氧化硅(nano-SiO2);然后在自制EA(环氧丙烯酸酯)预聚物中加入nano-SiO2和光引发剂,制成可UV(紫外光)固化的EA/nano-SiO2复合胶粘剂。研究结果表明:nano-SiO2具有尺寸均匀、分散性好等特点,其平均粒径为50 nm左右;复合胶粘剂的力学性能随TEOS含量增加呈先升后降态势,当w(TEOS)=20%(相对于EA质量而言)时,复合胶粘剂的力学性能达到相对最大值,说明少量nano-SiO2能同时达到增强增韧的效果。
Using tetraethoxysilane (TEOS) as an inorganic precursor and γ-methacryloxypropyltrimethoxysilane (KH-570) as a silane coupling agent, a sol-gel method was used to prepare nanosilica (nano-SiO2); and then add nano-SiO2 and photoinitiator to self-made EA (epoxy acrylate) prepolymer to make UV / UV-curable EA / nano-SiO2 composite adhesive. The results show that nano-SiO2 has the characteristics of uniform size and good dispersibility. The average particle size of nano-SiO2 is about 50 nm. The mechanical properties of composites increase first and then decrease with increasing TEOS content. When TEOS = 20% (Relative to the EA mass), the mechanical properties of the composite adhesive reached a relative maximum, indicating that a small amount of nano-SiO2 can simultaneously achieve the effect of enhancing toughening.