改性白泥精制碳酸钙加填及施胶特性研究

为了弄清碱回收白泥精制碳酸钙的基本特性对应用性能的影响,提高其加填性能和纸张施胶效果,采用淀粉-硬脂酸钠复合物对其进行了包覆改性。研究表明,当淀粉和硬脂酸钠对白泥用量分别为20%和5%时,改性白泥的比表面积降低了28.3%,Zeta电位降低了29%～56%,表面产生疏水性。通过对比商品碳酸钙、未改性白泥和改性白泥的应用性能发现,在26%加填量下,后者留着率分别高出前两者的25.5%和11.9%。加填量为42%时,白泥加填纸施胶性能较未改性白泥提高119%,接近商品碳酸钙水平。改性白泥加填纸各项强度指标最优,光学性能三者相近。

Preparation of Starch-lipid Complex Modified White Lime and Its Properties in Paper Filling

In order to investigate the influence of fundamental properties of white lime in alkaline recovery on its application and improve the filling properties and sizing efficiency thereof,starch-lipid complex was prepared and coated on the surface of white lime.When the white lime was modified with 20% corn starch and 5% sodium stearate in dosage,it was observed 28.3% and 29%~56% reduction in specific surface area and Zeta potential respectively and surface hydrophobicity was gained.The retention rate of modified white lime under 26% filling load was 25.5% higher than that of commercial calcium carbonate and 11.9% higher than that of white lime.The sizing degree of modified white lime filled paper,which was quite close to that of commercial calcium carbonate,was 119% higher than that of unmodified white lime under 42% filling load.Besides,the strength properties of modified white lime filled paper were better than those of the two others while the optical properties were nearly the same.