高岭土/柠檬酸复合高吸水树脂的制备及性能研究

Preparation and Study on Kaoline/Citric Acid Complex Superabsorbent Resin

采用水溶液聚合法,以N,N-亚甲基双丙烯酰胺(NMBA)为交联剂、过硫酸钾(KPS)为引发剂、丙烯酸(AA)和丙烯酰胺(AM)为单体,添加一定比例的高岭土和柠檬酸,通过发生共聚交联反应制备高岭土/柠檬酸复合高吸水树脂。试验探讨了高岭土和柠檬酸的质量比、单体质量比、交联剂用量、引发剂用量、反应温度和丙烯酸中和度对复合树脂吸水率的影响。结果表明,当m(高岭土)∶m(柠檬酸)=1∶2、m(AA)∶m(AM)=4∶1、交联剂用量为0.06%、引发剂用量为0.2%、反应温度为70℃、AA中和度为65%时,复合高吸水树脂的最大吸水率为965 g·g-1,最大吸盐水率为105 g·g-1。

A superabsorbent resin was synthesized by aqueous solution polymerization with acrylic acid, acrylamide, kaoline and citric acid as substrates, N, N- methylene bisacrylamide（NMBA） as crosslinker, and potassium persulfate（KPS） as initiator. The influences of mass ratio of kaoline and citric acid, the monomer ratio, the content of crosslinking agent, the amount of initiator, reaction temperature and neutralization degree of acrylic acid were studied. The results show that the optimal reaction conditions are as follows. The mass ratio of kaoline to citric acid was 1： 2, the mass ratio of acrylic acid to acrylamide was 4： 1, the amount of crosslinker was 0.06%, the amount of initiating agent was 0.2%, the reaction temperature was 70 ℃, and the neutralization degree of acrylic acid was 65%. Under such conditions, absorbency of the resin in distilled water and Na Cl solution were 965 and 105 g·g^-1, respectively.