SAS/AMPS/IA共聚物中官能团对碳酸钙的协同阻垢作用  

Synergistic Scale Inhibition of Calcium Carbonate by Functional Groups in SAS/AMPS/IA Copolymers

作　　者：余嵘[1] 刘扬 王增科 田昭 吕芙蓉 YU Rong;LIU Yang;WANG Zengke;TIAN Zhao;LYU Furong(Water Treatment Laboratory,College of Urban Planning and Engineering,Xi’an Polytechnic University,Xi’an 710600,China)

机构地区：[1]西安工程大学城市与规划工程学院水处理实验室,西安710600

出　　处：《材料导报》2021年第2期2207-2212,共6页Materials Reports

基　　金：陕西省工业科技攻关项目(2015GY101);陕西省教育厅科研计划项目(15JK1326)。

摘　　要：以衣康酸(IA)、烯丙基磺酸钠(SAS)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)为原料,通过自由基溶液共聚合法,合成均聚物PIA、PSAS、PAMPS以及SAS/AMPS/IA三元共聚物。红外光谱、凝胶渗透色谱分析显示,三元共聚物中含有羧基、磺酸基、酰胺基官能团。静态阻垢法表明:均聚物、共混物及不同单体配比的SAS/AMPS/IA共聚物对CaCO 3的阻垢效果有明显差异,共聚物中单体对阻垢效果影响程度的排序为:IA>AMPS>SAS。对CaCO 3垢样进行SEM、XRD分析:加入PSAS、PAMPS的CaCO 3晶体结晶颗粒减小,晶胞出现条状纹理;加入PIA、SAS/AMPS/IA的CaCO 3晶体碎散,棱角消失,XRD图谱显示方解石特征峰的峰高显著降低,CaCO 3晶体由方解石逐步转变为球霰石。晶体破坏程度的排序为:SAS/AMPS/IA>PIA>PAMPS>PSAS。对加入均聚物及共聚物SAS/AMPS/IA的CaCO 3晶体表面进行Zeta电位测试,根据静电排斥能分析表明,羧基主要吸附于Ca 2+表面,而磺酸基所带的负电荷增加了垢体表面的电势能,增大颗粒间静电斥力从而使CaCO 3晶体分散稳定,并破坏方解石晶体的形成,两种官能团的协同作用使得SAS/AMPS/IA对碳酸钙晶体的破坏程度增大。而均聚物PIA、PSAS、PAMPS因不存在多官能团间的协同作用,它们的阻垢效果明显低于共聚物SAS/AMPS/IA的阻垢效果。Homopolymer PIA,PSAS,PAMPS and SAS/AMPS/IA terpolymer were synthesized by free radical solution copolymerization using itaconic acid(IA),sodium allyl sulfonate(SAS),2-acrylamide-2-methylpropionic acid(AMPS)as raw materials.The functional groups of carboxyl group,sulfonate group and amide group were found in the terpolymer by IR and gel permeation chromatography.The static scale inhibition me-thod showed that the scale inhibition effect of homopolymer,blend and SAS/AMPS/IA copolymer with different monomer ratios had significant differences on CaCO 3,and the order of the influence of monomers in the copolymer on scale inhibition effect was IA>AMPS>SAS.The CaCO 3 scale samples were analyzed by SEM and XRD.The CaCO 3 crystals added with PSAS and PAMPS decreased,and the cells showed strip-like texture.The CaCO 3 crystal added with PIA,SAS/AMPS/IA is fragmented,and the edges and corners disappear.The XRD pattern shows that the peak height of calcite is significantly reduced,and the CaCO 3 crystal is gradually transformed from calcite to spherical aragonite.Order of degree of crystal destruction:SAS/AMPS/IA>PIA>PAMPS>PSAS.In the case of adding homopolymer and copolymer separately,the Zeta potential test was performed on the surface of the CaCO 3 crystal.It can be seen from the analysis of electrostatic repulsion energy that carboxyl groups are mainly adsorbed on calcium ions,and the negative charge of sulfonic acid groups increases the potential energy of the scale surface,so the electrostatic repulsion between particles increases,which makes CaCO 3 crystals dispersed stably,and at the same time,the formation of calcite crystals is destroyed.The synergistic effect of the two functional groups makes SAS/AMPS/IA more damage to calcium carbonate crystals.The homopolymer PIA,PSAS,and PAMPS have no synergistic effect among multifunctional groups,so their scale inhibition effect is significantly lo-wer than that of copolymers.

关 键 词：聚合物 官能团 协同作用 碳酸钙 

分 类 号：TQ317[化学工程—高聚物工业]