碳酸钙超细研磨用分散剂的制备与应用  

Synthesis and Application of Dispersant for Ultrafine Ground Calcium Carbonate Grinding

作　　者：张雪[1] 胡惠仁[1] 何秋实[1] 

机构地区：[1]天津科技大学天津市制浆造纸重点实验室,天津300457

出　　处：《中国造纸》2014年第4期14-21,共8页China Pulp & Paper

基　　金：国家十二五科技支撑项目(2011BAC11B04);天津市科技创新体系及条件平台建设计划项目(105YSYJC28000)

摘　　要：采用水溶液自由基聚合的方法,以丙烯酸(AA)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)为聚合单体,过硫酸铵为引发剂,次亚磷酸钠为链转移剂,制备研磨碳酸钙(GCC)超细研磨用分散剂二元聚合物P(AA-AMPS)。考察了单体配比、引发剂用量、链转移剂用量、反应时间、反应温度等对P(AA-AMPS)的性能及GCC助磨效果的影响,并用红外光谱(FT-IR)、核磁共振碳谱(13CNMR)、液相凝胶渗透色谱(GPC)及热重分析(TG-DTG)对P(AA-AMPS)的结构及分子质量进行表征。通过单因素实验优化得出,单体配比m(AMPS)∶m(AA)=0.25,引发剂用量4%(占单体总质量分数),链转移剂用量7%(占单体总质量分数),反应时间5.5 h,反应温度80℃时,聚合物的各项性能最佳。将合成的分散剂用于GCC的超细研磨,通过探讨分散剂用量及添加方式对研磨效果的影响,确定了最佳的研磨条件。与商品助磨剂比较,相同研磨条件下,P(AA-AMPS)研磨GCC浆液<2μm的含量为97.2%,P(AA-AMPS)对GCC的助磨效果更明显。Using the technology of free radical polymerization, the dispersant used for grinding of ultrafine ground calcium carbonate （GCC）, P（AA-AMPS） were prepared by using acrylic acid （AA） and 2-acrylamido-2-methyl propane sulfonic acid （AMPS） as monomers, ammoni- um persulfate as initiator, sodium hypophosphite as chain transfer agent, and the effect of P（AA-AMPS） on grinding was investigated. Re- suits showed that P（AA-AMPS） demonstrated excellent performance and had a good grinding effect when it was prepared under the following polymerization conditions ： mass ratio of monomers （AA-AMPS） = 4：1, chain transfer agent dosage 7 wt% （ based on the total monomers）, reaction temperature 80℃, reaction time 5.5 h, initiator dosage 4 wt % （based on the total monomers）. The products were characterized by Fr-TR, 13 C-NMR, GPC and TG. When dispersant P（AA-AMPS） was used in the wet grinding process, the dispersant dosage and the adding mode of dispersant were investigated. Under the same grinding conditions, the grinding effect of P（AA-AMPS） was much better than that of the commercial products.

关 键 词：超细研磨 重质碳酸钙 回黏黏度 粒径 分散剂 

分 类 号：TS727[轻工技术与工程—制浆造纸工程]