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制浆造纸过程中由于水质不良引起的无机结垢问题是不容忽视的。本文以丙烯酸(AA)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)和衣康酸(IA)为单体,过硫酸铵为引发剂,异丙醇为链转移剂,在水相中合成AA/IA/AMPS三元共聚物型阻垢剂,通过正交实验设计,考察了单体配比、反应温度、引发剂用量、反应时间等因素对合成产物阻垢性能的影响,由此得到了优化的合成条件和产品。将之与多种商业样品进行阻垢性能比较,且同时考察它们在分散能力和螯合能力上的差异,结果表明自制AA/IA/AMPS共聚阻垢剂的综合效果具有明显的优越性。最后,通过扫描电镜观察,初步探索了阻垢剂对碳酸钙垢的作用机理,发现该阻垢剂的使用使碳酸钙垢从相对稳定的方解石晶形转变为不稳定的块状文石晶型,从而达到转化的阻垢效果。
Pulp and paper process due to poor water quality caused by inorganic scaling problems can not be ignored. In this paper, acrylic acid (AA), 2-acrylamide-2-methylpropane sulfonic acid (AMPS) and itaconic acid (IA) monomer, ammonium persulfate as initiator, isopropyl alcohol as chain transfer agent, Phase AA / IA / AMPS ternary copolymer scale inhibitor was synthesized. The effects of monomer ratio, reaction temperature, initiator dosage and reaction time on the scale inhibition performance of the synthesized product were investigated by orthogonal experimental design. As a result, optimized synthesis conditions and products were obtained. The comparison of scale inhibition performance with a variety of commercial samples, and their differences in dispersibility and chelating ability were also investigated. The results showed that the combined effect of self-made AA / IA / AMPS copolymerization scale inhibitor has obvious advantages. Finally, the mechanism of scale inhibitor on calcium carbonate scale was explored by scanning electron microscopy. It was found that the use of scale inhibitor changed calcium carbonate scale from relatively stable calcite crystal form to unstable block aragonite, So as to achieve the scale conversion effect.