二氧化钛复合填料的制备及在装饰原纸中的应用研究

Preparation of Titanium Dioxide/Talc Composite Filler and Its Application in Decorative Base Paper

关键词:  二氧化钛  滑石粉  复合填料  装饰原纸  加填

Key Words:titanium dioxide  talc  composite filler  decorative base paper  filling

摘要:分别采用搅拌混合方式和机械研磨方式，将二氧化钛和高岭土、滑石粉、重质碳酸钙（GCC）、硅灰石制备混合/复合填料，并将其用于装饰原纸加填，对比分析不同填料对纸张性能的影响。结果表明，采用机械研磨方式将二氧化钛包覆滑石粉制得的二氧化钛/滑石粉复合填料的加填效果最好。为了更好地满足二氧化钛包覆条件，对滑石粉进行预研磨，采用单因素实验探讨了研磨浓度、研磨时间、介质比对滑石粉粒径大小的影响。结果表明，当研磨浓度为50%，研磨时间为120 min，介质比为1∶8.5时滑石粉预研磨效果最佳，粒径约为1 μm。通过正交实验优化二氧化钛包覆滑石粉的制备工艺，当复合研磨时间50 min、研磨浓度50%、介质比1∶10、滑石粉与二氧化钛的复配比例5∶5时，制备的二氧化钛复合填料加填的装饰原纸不透明度为98.6%，白度为86.7%。另外，利用扫描电子显微镜（SEM）和傅里叶变换红外光谱仪（FT-IR）对二氧化钛复合填料进行分析表征，结果发现，二氧化钛与滑石粉之间生成新的化学键，即Ti—O—Si键。

Abstract:Mixed/composite fillers of titanium dioxide and kaolin， talc， grounel calcium carbonate （GCC） and wollastonite were added to the decorative base paper by mixing or mechanical grinding methods. The effects of the fillers on paper properties were discussed and the results showed titanium dioxide/talc composite filler was better by mechanical grinding of talc coated with titanium dioxide. In order to meet the coating conditions of titanium dioxide， talc was pre-ground. The optimum pre-grinding conditions of talc was determined by single factor method. The optimum conditions were determined as grinding concentration 50%， grinding time 120 min， and medium ratio 1∶8.5. Under this condition， the particle size of the titanium dioxide/talc composite filler was about 1 μm. The preparation process of the composite filler was optimized by an orthogonal experiment， and the opacity and whiteness of decorative base paper were 98.6% and 86.7%， respectively， when composite grinding time was 50 min， grinding concentration was 50%， medium ratio was 1∶10 and compound ratio of talc and titanium dioxide was 5∶5. In addition， scanning electron microscopy （SEM） and Fourier transform infrared spectroscopy （FT-IR） analyses showed that a new chemical bond， Ti—O—Si bond， was formed between titanium dioxide and talc.