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 stable nano silica sol modified llano CaCO3 aqueous dispersion was prepared by means of sol-gel method with the treatment of ultrasonic.The FTIR,TEM,Zeta potential and TGA were used to analyze the hybrid effect of nano silica sol and nano CaCO3.The stability and particle size of the modified nano CaCO3 aqueous dispersion were studied,the covering effect between the two nano particles and the heat resistance of the modified nano CaCO3 were measured.Meanwhile,the polyurethanurea(PUU)/modified nano CaCO3 hybrid aqueous dispersion with solid content of 30%was prepared by in-situ dispersing PUU with the modified nano CaCO3 aqueous dispersion.The result showed that the modified nano CaCO3 possessed good dispersity in the hybrid PUU dispersion and the mechanical properties of the PUU films were enhanced appreciably with the hybrid of the modified nano CaCO3.
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