摘要
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(APS)为氧化剂,次亚磷酸钠(SHP)为链转移剂,通过水溶液自由基聚合反应,制备低分子量的AA-AMPS二元聚合物。考察了单体配比、引发剂用量、链转移剂用量、反应时间、反应温度等对重质碳酸钙(GCC)助磨效果的影响,并对产物的结构进行表征。通过优化得出,在单体质量比(AA/AMPS)4∶1,引发剂浓度4%(相对于总单体),链转移剂用量7%(相对于总单体),反应时间5.5h,反应温度80℃时,聚合物的各项性能最佳。最后探讨了AA-AMPS二元聚合物的助磨机理,结果表明聚合物与碳酸钙粒子间发生了牢固的化学吸附,有利于研磨浆液的稳定。
The low molecular weight copolymer dispersants AA/AMPS were synthesized with acrylic acid （AA） and 2-acrylamido-2-methyl propane sulfonic acid （AMPS） as monomers, ammonium persulfate as initiator, sodium hypophosphite as chain transfer agent through aqueous free radical polymerization. The effects of weight ratio of monomers, initiator dosage, chain transfer agent dosage, reaction time and reaction temperature were investigated.AA/AMPS copolymer demonstrated excellent properties and had a good grinding ability under the following polymerization conditions： weight 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 FT-TR, 1H-NMR and TG-DTG. The influence of AA/AMPS copolymer on the grinding of GCC was also investigated by SEM and ATR-FrIR, and the adsorption of the polymer chain on the particle surface was found to prevent the aggregation through an electrosteric effect, so allowing the GCC slurry viscosity to be reduced.
出处
《造纸科学与技术》
北大核心
2014年第2期39-44,共6页
Paper Science & Technology
基金
国家十二五科技支撑计划项目(2011BAC11B04)
天津市科技创新体系及条件平台建设计划项目(10SYSYJC28000)
关键词
自由基聚合
GCC
湿法超细研磨
助磨机理
free radical polymerization
GCC
wet uhrafine grinding
grinding mechanism
