超低分子量丙烯酸/烯丙基磺酸钠的制备及对陶瓷粉体的分散性能

Preparation and Performance of Ultra Low Molecular Weight AA/SAS Copolymer Dispersant for Ceramic Powder

摘要:

以丙烯酸（AA）、烯丙基磺酸钠（SAS）为单体，根据自由基共聚反应机理制备了水溶性共聚物陶瓷分散剂AA/SAS。探讨了不同反应条件对共聚物分散性能的影响，通过傅里叶变换红外光谱（FTIR）、差示扫描量热（DSC）、X射线衍射（XRD）以及凝胶渗透色谱（GPC）对共聚物进行了表征，并研究了分散剂用量对陶瓷浆料的流变性能以及Zeta电位的影响。得到的最佳合成条件为：AA与SAS的质量比为5:1，反应温度为80℃，引发剂用量为单体质量的7.3%，链转移剂用量为单体质量的225.5%；当共聚物加入量（折固掺量）为陶瓷粉体质量的0.3%时，其分散效果最好；当共聚物质量浓度为1.2g/L时，浆料的Zeta电位的绝对值由37.7mV升高到62.1mV。与进口产品PC-67相比，共聚物具有更好的分散效果。

Abstract:

Through radical copolymerization, the soluble copolymer dispersant AA/SAS for ceramic powder was synthesized with acrylic acid (AA) and sodium allylsulfonate (SAS). The effect of different reaction conditions on the dispersing property of copolymer has been investigated. The copolymer was analyzed by Fourier transform infrared spectrometer (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and gel permeation chromatography(GPC). Meanwhile, the effects of dispersant concentration on the rheological behavior and Zeta potential of the ceramic slurry were also studied. The results show that the optimum condition of synthesis is as follow: the mass ratio of acrylic acid and sodium allylsulfonate 5:1, the reaction temperature 80℃, the dosage of initiator 7.3%, and the amount of chain transfer agent 225.5%. When its mass fraction was 0.3%, its dispersing effect was the best. The Zeta potential absolute value of the slurry increased from 33.7mV to 62.1mV as the mass concentration of the copolymer was 1.2g/L. In comparison with imported products PC-67, the copolymer could show better dispersity．