AA-AMPS共聚物陶瓷分散剂的制备及分散性能研究

Preparation and Characterization of AA-AMPS Copolymer Dispersant for Ceramic Powder

摘要:

以丙烯酸和2-丙烯酰胺基-2-甲基-丙烷磺酸(AMPS)为单体，过硫酸铵(NH4)2S2O8作为引发剂，次亚磷酸氢钠作为链转移剂，通过自由基聚合反应合成共聚物PAA-AMPS。探讨了不同反应条件对共聚物分散性能的影响，共聚物分散剂PAA-AMPS的最佳合成条件为：丙烯酸（AA）与2-丙烯酰胺基-2-甲基-丙烷磺酸(AMPS)的摩尔比为8:1；引发剂(NH4)2S2O8用量为单体质量的1 %；链转移剂次亚磷酸氢钠的用量为单体质量的10%；单体质量分数为24%；反应温度85 ℃。通过FT-IR、GPC 及TGA等手段对共聚物的结构、热稳定性以及相对分子质量及其分布进行了表征，并对添加不同量的分散剂的料浆粘度进行研究。结果表明，聚合物质量分数为0.25%，料浆的粘度最低，共聚物的分散效果最好。

Abstract:

The copolymer dispersant for ceramic powder PAA-AMPS was synthesized with acrylic acid and 2-acrylamido-2- methyl propane sulfonic acid as monomer, ammonium persulfate as redox initiator,and sodium hypophosphite as reducing agent. The effect of different reaction conditions on dispersing properties of copolymer has been investigated. The optimum conditions are as follows : the mole ratio of acrylic acid and 2-acrylamido-2- methyl propane sulfonic acid 8:1, the amount of initiator 1%, the amount of sodium hypophosphite 10%, the mass fraction of monomer 24%, reaction temperature 85℃. The copolymer was characterized and analyzed by FT-IR , GPC and TGA, and the effect of the concen tration of the copolymer（PAA-AMPS）on the viscosity of the ceramic slurry was investigated. The results show that smaller viscosity and better dispersion effects are achieved when the copolymer mass fraction is 0.25 %.