纳米二氧化硅改性纸/塑复合用聚氨酯胶粘剂的研究

Study on nano-SiO_2 modified polyurethane adhesive for paper/plastic laminating

以γ-氨丙基三乙氧基硅烷（KH-550）、正硅酸乙酯（TEOS）为原料,采用溶胶-凝胶法制备了改性纳米Si O2（二氧化硅）;然后将其引入至PU（聚氨酯）胶粘剂中,制备了纸/塑软包装复合用无溶剂PU胶粘剂。研究结果表明：硅烷偶联剂（KH-550）已成功接入至纳米Si O2结构中,改性纳米Si O2的单分散性良好且粒径分布在100～200 nm范围内;当w（改性纳米Si O2）=0.8%（相对于胶粘剂总质量而言）时,胶粘剂的剥离强度（为420 N/m）相对最大。

With γ-aminopropyl triethoxy silane （KH-550） , ethyl orthosilicate （TEOS） as raw materials, a modified nano-SiO_2 （silica） was prepared by sol-gel method. Then, a solvent-free PU adhesive for paper/plastic flexible packaging was prepared by introducing modified nano-SiO_2 into PU （polyurethane） adhesive. The research results showed that the silane coupling agent（KH-550） was successfully introduced into nano-SiO_2 structure, and the modified nano-SiO_2 had the good monodispersity, and its particle size distribution range was 100-200 nm. The adhesive had the relatively maximum peeling strength （420 N/m） when mass fraction of modified nano-SiO_2 was 0.8% in total adhesive.