摘要
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。
Poly （acrylic acid-co-allyl glycidyl ether ） for ceramic dispersant was synthesized. Ammonium persulfate was used as initiator agent, and sodium hypophosphite was a chain transfer agent for synthesis. The reaction was monitored by online infrared, and the molecular weight was measured by gel-permeation chromatography （ GPC ）. The effects of synthesis conditions, such as concentration of acrylic acid, ammonium persulfate, sodium hypophosphite, reaction temperature and reaction time, were investigated respectively. The effect of dispersant weight on Zeta potential value and suspension rhelogy behavior was discussed as well. The online IR showed that the polymer was poly （acrylic acid co-maleic anhydride） sodium, and its optimal synthetic conditions were determined as follows：w （acrylic acid） 28% , ammonium persulfate 0. 17 g, sodium hypophosphite 2 g, allyl glycidyl ether 0. 9 mL, reaction temperature 70 ℃, reaction time 3.5 h. The lowest Zeta potential value was -66.7 mV when the mass concentration of the dispersant was 150 rag/L, and the shear stress reduced along with the increase of dispersant weight.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2013年第11期1269-1273,共5页
Fine Chemicals
基金
佛山市禅城区产学研专项资金项目(20111072063)~~
