化学沉淀法制备二氧化钛复合填料及其在装饰原纸中应用

Preparation of Titanium Dioxide Composite Filler via Chemical Precipitation Method and Its Application in Decorative Base Paper

关键词:  TiO₂  滑石粉  装饰原纸  复合填料

Key Words:titanium dioxide  talc  decorative base paper  composite filler

摘要:以滑石粉为基体，硫酸钛为钛源，尿素为沉淀剂，硝酸锌（Zn(NO₃)₂）为晶型促进剂，采用化学沉淀法制备金红石型二氧化钛（TiO₂），并沉积在滑石粉表面，制备TiO₂/滑石粉复合填料。结果表明，TiO₂/滑石粉复合填料的最佳制备条件为：滑石粉悬浮液质量分数5%、水解温度80 ℃、pH值=1.7、陈化时间3.0 h、硫酸钛溶液浓度0.25 mol/L、滴加速度3 mL/min、煅烧温度800 ℃。当其加填量为30%时，获得的装饰原纸的不透明度和白度最高，分别为97.3%和84.5%，与加填TiO₂纸张性能接近，可以替代TiO₂应用在装饰原纸中。

Abstract:With talc as the matrix， titanium sulfate as the source of titanium， urea as the precipitant， and Zn（NO₃）₂ as the crystalline accelerator， chemical precipitation method was used to prepare rutile-type titanium dioxide （TiO₂）， which deposited on the surface of talc to prepare TiO₂/talc composite filler. The results showed that the optimum condition was suspension mass fraction of 5%， hydrolysis temperature at 80 ℃， pH value=1.7， aging time for 3.0 h， titanium liquid concentration of 0.25 mol/L， dropping velocity of 3 mL/min and calcination temperature at 800 ℃.When the composite filler obtained under this condition was added to the decorative base paper， the opacity and whiteness of prepared paper were 97.3% and 84.5%， respectively when the amount of filling was 30%， which were relatively similar to the performance of the paper filled with TiO₂， indicating that composite filler could replace TiO₂ used in the decorative base paper.