为了提高α-氰基丙烯酸酯胶粘剂在水下的快速粘结性能,用纳米SiO_2和硅烷偶联剂KH-500对其进行改性,用红外光谱表征了硅烷偶联剂处理纳米SiO_2提高α-胶粘结强度的机理,并通过扫描电镜(SEM)分析了纳米SiO_2在α-氰基丙烯酸酯胶粘荆中的分散性及增韧机理.结果表明,改性后的α-氰基丙烯酸酯胶粘剂中引入了Si-O-C键,使其在水下5 s快速粘结钢板和铝板的附着力大大提高.
Silane coupling agent KH-500 and nano-SiO_2 were used to modify α-cyanoacrylate adhesive so as to increase its adhesion on iron and steel substrates.The mechanism for nano-SiO_2 to increase the adhesion to substrate and toughness of α-cyanoacrylate adhesive and the microstructure of the modified adhesive were analyzed by means of infrared spectrometry and scanning electron microscopy.Moreover,the underwater adhering performances of the modified adhesive for steel and aluminum were evaluated.Results indicate that Si-O-C bond is formed after chemical modification of α-cyanoacrylate adhesive by silane coupling agent and nano-SiO_2,which contributed to greatly increased underwater adhesion of the modified adhesive on iron and steel substrates.
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