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以过硫酸铵为引发剂、次亚磷酸钠作链转移剂,合成陶瓷用分散剂聚丙烯酸-烯丙基缩水甘油醚。用凝胶渗透色谱(GPC)表征了其相对分子质量(简称分子量,下同),并用在线红外监测反应过程。研究了丙烯酸单体用量、过硫酸铵用量、次亚磷酸钠用量、反应温度和反应时间对聚合物分子量的影响,考察其对陶瓷浆料流动时间的影响,并讨论了分散剂用量对陶瓷悬浮液的Zeta电位值和流变性能的影响。在线红外光谱分析表明,聚合物为丙烯酸-烯丙基缩水甘油醚共聚物钠盐,最佳合成条件为:烯丙基缩水甘油醚0.9 mL、反应温度70℃、引发剂用量0.17 g、链转移剂2 g、丙烯酸质量分数28%、反应时间3.5 h。分散剂质量浓度为150 mg/L时,ζ电位最低,为-66.7 mV,增大分散剂质量,有利于降低体系剪切应力。
Ammonium persulfate as initiator, sodium hypophosphite as chain transfer agent, synthetic dispersant for polyacrylic acid - allyl glycidyl ether. The relative molecular mass (molecular weight, the same below) was characterized by gel permeation chromatography (GPC), and the reaction was monitored by on-line infrared. The effects of the amount of acrylic acid monomer, the amount of ammonium persulfate, the amount of sodium hypophosphite, the reaction temperature and the reaction time on the molecular weight of the polymer were investigated. The influence of the amount of dispersant on the ceramic suspension Zeta potential of liquid and rheological properties. On-line infrared spectroscopy showed that the polymer was sodium salt of acrylic acid-allyl glycidyl ether copolymer. The optimum conditions were: allyl glycidyl ether 0.9 mL, reaction temperature 70 ℃, initiator amount 0.17 g, chain transfer Agent 2 g, acrylic acid content 28%, reaction time 3.5 h. When the concentration of dispersant is 150 mg / L, the zeta potential is the lowest, which is -66.7 mV. Increasing the mass of the dispersant can reduce the shear stress of the system.