论文部分内容阅读
以甲基丙烯酰氧乙基二甲基胺(DM)与1,3-丙磺酸内酯为原料合成了3-(2-甲基丙烯酰氧乙基二甲氨基)丙磺酸盐(DMAPS)。以过硫酸铵为引发剂、次亚磷酸钠为链转移剂,在水溶液中进行DMAPS本体自由基聚合,制备了两性离子型聚电解质(PDMAPS),并将其用作二氧化硅分散剂。利用FTIR、1HNMR以及GPC对DAMPS和PDAMPS进行分析与表征,并通过单因素实验和正交实验研究了不同反应条件对聚电解质分散性能的影响。为了使分散的二氧化硅达到最低的黏度和粒径,最优的制备条件如下:反应温度为75℃、反应时间为3 h、引发剂加入量为单体质量的1.0%,在该条件下制备的PDMAPS分散性能最佳,当其掺量为0.8%(质量分数)时,粒径分析表明其二氧化硅中值粒径(d50)从21.193μm降低到0.449μm。
3- (2-methacryloyloxyethyldimethylamino) propanesulfonic acid salt was synthesized from methacryloyloxyethyl dimethylamine (DM) and 1,3-propane sultone DMAPS). Using ammonium persulfate as initiator and sodium hypophosphite as chain transfer agent, free radical polymerization of DMAPS in aqueous solution was carried out to prepare zwitterionic polyelectrolyte (PDMAPS) and use it as silica dispersant. The DAMPS and PDAMPS were analyzed and characterized by FTIR, 1HNMR and GPC. The influence of different reaction conditions on the dispersion properties of polyelectrolytes was investigated by single factor experiments and orthogonal experiments. In order to achieve the lowest viscosity and particle size of the dispersed silica, the optimum preparation conditions are as follows: the reaction temperature is 75 ℃, the reaction time is 3 h, the initiator is added in an amount of 1.0% of the monomer mass, under these conditions The prepared PDMAPS showed the best dispersion performance. When its content was 0.8%, its particle size analysis showed its median diameter of silica (d50) decreased from 21.193μm to 0.449μm.