活性硅酸钙在高填料文化用纸中的应用研究

Application research of activated calcium silicate in high filler fine paper

研究了活性硅酸钙作为填料在高填料文化用纸中的应用。所用硅酸钙填料来源于电厂粉煤灰,平均粒径为31.90μm,是一种偏碱性、带有较强负电荷、高分散新型硅酸盐产品。以针叶木浆和阔叶木浆为纤维原料,在打浆度45°SR情况下,以40/60的比例进行混合,采用阳离子玉米淀粉和两性聚丙烯酰胺的双元增强助留体系,抄造出来的纸样在活性硅酸钙填料的添加量为35%时,各项指标均达到了国家静电复印纸标准(GB/T 24988-2010)规定要求。在针叶木浆与废纸浆的混合比例达到50/50时,采用同样的抄造方法也可以达到以上标准要求。在此基础上,在小长网试验纸机上,以针叶木浆/阔叶木浆(40/60)为原料进行抄纸试验,按照CS(1.5%)、AmCPAM(0.8%)、CPAM(0.03%)、AKD(0.5%)、填料(74%)的顺序加入各种助剂,抄造出的纸样在活性硅酸钙填料的添加量达到35%时,其白度、紧度、施胶度、不透明度、撕裂度、耐折度、抗张强度、弯曲挺度等各项指标均能够满足国家标准要求。

Application of activated calcium silicate as papermaking ifller for high ifller ifne papers was studied in this article. The activated calcium silicate was extracted from fine coal ash which is produced from thermal power plant. Calcium silicate ifller is a kind of negatively charged, alkaline, high dispersion product with mean particle diameter of 31.90μm. The performances of the handsheet could meet the requirements of the national standards for copy paper（GB/T 24988-2010）, while the bleached soft wood KP pulp and hard wood pulp （40/60） was used as ifber stock and the ash content of the handsheet was 35%. The same results were obtained when the bleached softwood kraft pulp and deinked pulp （ratio 50/50） was used. Cationic starch and AmCPAM, comprising a binary retention system, were employed in handsheet making. The pilot experiment was carried out on a Fourdrinier paper machine while bleached softwood kraft pulp and hard wood pulp were used with a ratio of 40/60. When the loading order and dosage of paper chemicals were as follow： CS（1.5%）, AmCPAM（0.8%）, CPAM（0.03%）, AKD（0.5%）, filler（74%）, the performances of pilot scale experiment paper sample could also meet the requirements of the national standards for copy paper, GB/T 24988-2010.