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利用原位溶胶-凝胶法制备二氧化硅,对沉淀碳酸钙(PCC)进行表面改性,并采用光谱和显微镜分析技术对这种新型改性材料进行表征。结果表明,在偏三角形PCC晶体表面会覆盖一层紧密的二氧化硅层;通过热重分析发现,在适宜的实验条件下,二氧化硅在PCC表面的沉积量能够达到25%。虽然改性后PCC的平均粒径有所变化,但是用激光粒度仪测定的改性前后PCC的粒径分布相近。这一特性对改性PCC的应用至关重要,如将其用作造纸填料能够增加纤维与纤维之间的结合,提高纸张强度。
Silica was prepared by in-situ sol-gel method, surface modification of precipitated calcium carbonate (PCC) was carried out, and the new modified material was characterized by spectroscopic and microscopic analysis. The results show that a dense layer of silicon dioxide is covered on the surface of the PCC crystal. Thermal gravimetric analysis shows that the amount of silica deposited on the PCC surface can reach 25% under the proper experimental conditions. Although the average particle size of modified PCC was changed, the particle size distribution of PCC before and after modified by laser particle sizer was similar. This feature is crucial for the application of modified PCC. For example, using it as a paper-making filler can increase the bonding between fiber and fiber and improve paper strength.