采用螯合型钛酸酯偶联剂对沉淀碳酸钙进行改性,将改性产物经550 ℃煅烧,得到改性碳酸钙.对产物进行XRD,XPS,红外分析表征,结果显示:改性的碳酸钙的表面存在有钛酸钙晶体和钛的四价氧化物.将改性碳酸钙用作造纸填料,纸张的白度略有升高,力学性能有一定程度的下降,填料留着率没有发生明显的变化.
Chelated titanate coupling agent was used to modify precipitated calcium carbonate (PCC), after that the slurry was collected and calcined at 550 ℃ to obtain modified PCC.The modified PCC was characterized by XRD, XPS and FTIR.It can be inferred from the results that calcium titanate crystal and oxide of Ti4+ exist on the surface of the modified PCC.The modified PCC is used as filler to prepare handsheets.Brightness increases slightly, mechanical properties decrease to some extent and filler retention don't change apparently for handsheet with modified PCC as filler compared to control PCC.
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