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采用含有纳米硅溶胶的纳米碳酸钙悬浮液在超声波处理及加热条件下,硅溶胶发生缩合反应从而沉积在纳米碳酸钙粒子表面的溶胶-凝胶沉淀法,制备出性能稳定的纳米碳酸钙/二氧化硅复合粒子。通过红外光谱(FTIR)、TEM分析、zeta电位测定以及TGA分析,表征了硅溶胶与纳米CaCO3粒子之间的杂化作用,研究了改性纳米CaCO3复合粒子水分散液的稳定性和粒径、两种纳米粒子之间的包覆作用、杂化作用以及改性后纳米CaCO3复合粒子的热稳定性。同时研究发现,改性后的无机纳米CaCO3复合粒子在聚氨酯脲水分散液中具有很好的分散性。
The nano-calcium carbonate containing nano-silica sol suspension under ultrasonic treatment and heating conditions, the silica sol condensation reaction and thus deposited on the surface of the nano-calcium carbonate sol-gel precipitation method to prepare a stable nano-calcium carbonate / Silica composite particles. The hybridization between silica sol and nano-CaCO3 particles was characterized by FTIR, TEM, zeta potential and TGA analysis. The stability and particle size of the modified nano-CaCO3 composite particles aqueous dispersion were investigated. Coating between two kinds of nanoparticles, hybridization and thermal stability of modified nano-CaCO3 composite particles. At the same time, it was found that the modified inorganic nano-CaCO3 composite particles have good dispersibility in polyurethane urea aqueous dispersion.