聚丙烯酸-烯丙基缩水甘油醚的制备及分散性能研究

Synthesis and Dispersion of Acrylic Acid-co-Maleic Anhydride for Ceramic Suspension

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）表征了其分子量，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，并讨论了分散剂量对陶瓷悬浮液的Zeta电位值和流变性能的影响。在线红外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：烯丙基缩水甘油醚为0.9mL、反应温度为70℃、引发剂量为0.17g、链转移剂为2g，丙烯酸的质量分数为28%和反应时间为3.5h。分散剂质量浓度为150mg/L时，ζ电位最低值为-66.7mV,增大分散剂添加质量，有利于降低体系剪切压力。

Abstract:

Poly (acrylic acid-co-Allyl glycidyl ether) for ceramic dispersantion was synthesized. Ammonium persulfate was used as initiator agent, and the 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 were measured as well. The online IR showed that polymer was poly (acrylic acid co-maleic anhydride) sodium, its optimal synthetic conditions were got as follows: w(acrylic acid) 28wt%, ammonium persulfate 0.17 g, sodium hypophosphite 2 g, allyl glycidyl ether 0.9mL, reaction temperature 80 ℃, reaction time 3.5h. The lowest Zeta potential value was -66.7mV, when dispersant weight concentration was 150mg/L, the shear stress reduced along with the increased dispersant weight.