硅酸三钙-微纤化纤维素/重质碳酸钙复合填料的制备及其性能

Preparation and Properties of Tricalcium Silicate-MFC/GCC Composite Filler

将硅酸三钙水化反应引入到复合填料的制备过程,采用行星式球磨机制备出能与纸张纤维进行交联的反应型填料,并对填料以及其加填纸张的结构和性能进行表征。结果表明:硅酸三钙与微纤化纤维素(microfibrillated cellulose,MFC)在研磨过程中可以形成电位为正值的硅酸三钙-MFC复合物,并吸附电位为负值的重质碳酸钙(ground calcium carbonate,GCC),最终形成含有羟基的三元硅酸三钙-MFC/GCC复合填料。复合填料的留着率相较于传统GCC的留着率提升了17%;填料研磨时间为20 h时,三元复合填料加填纸张的裂断长相较于GCC/MFC二元复合填料加填纸张的裂断长提升20%左右。

In our current study,the hydration reaction of tricalcium silicate was introduced into the preparation process of composite fillers,the reaction type inorganic fillers that can crosslink with cellulose fibers were prepared with the use of a planetary ball mill,and the structure and the properties of fillers and the paper filled with the fillers were characterized.The results showed that tricalcium silicate and microfibrillated cellulose(MFC)could form a two-component tricalcium silicate MFC composite with a positive potential value during the grinding process,then adsorb ground calcium carbonate(GCC)with a negative potential value,and finally form three-component tricalcium silicate MFC/GCC composite filler containing hydroxyl groups.The retention rate of composite fillers increased by 17%compared to traditional GCC fillers;the fracture length of the paper filled with the three-component composite filler increased by about 20%compared to that filled with GCC/MFC composite filler when the grinding time of the filler reached 20 hours.