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以丙烯酸(AA)和腐植酸(HA)为原料,N,N-二亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸铵(APS)为引发剂,采用水溶液聚合法合成了一系列高HA含量的AA-HA复合吸水树脂。研究了MBA用量、APS用量、单体浓度、AA的中和度、反应温度等对AA-HA复合吸水树脂吸液性能的影响,当m(AA):m(HA)=4:1,4:2,4:3,4:4时,在适宜条件(n(NaOH):n(AA)=0.6:1、80℃、c(AA)=2.31 mol/L)下合成的AA-HA复合吸水树脂的吸液率分别为635,570,350,300 g/g。探讨了AA-HA复合吸水树脂在不同pH溶液、不同离子强度盐溶液和不同环境温度中的吸液性能。采用FTIR方法对AA-HA复合吸水树脂的结构进行了表征,表征结果显示,AA-HA复合吸水树脂为接枝共聚物。
In this paper, a new method was synthesized by aqueous solution polymerization using acrylic acid (AA) and humic acid (HA) as raw materials, N, N-dimethylene bisacrylamide (MBA) as crosslinking agent and ammonium persulfate (APS) as initiator Series of high-HA AA-HA composite water-absorbing resin. The effects of the amount of MBA, the amount of APS, the monomer concentration, the neutralization degree of AA and the reaction temperature on the liquid-absorbent properties of the AA-HA composite absorbent resin were investigated. When m (AA): m AA-HA composite synthesized at the appropriate conditions (n (NaOH): n (AA) = 0.6: 1, 80 ° C, c (AA) = 2.31 mol / L) The water absorption rate of the water-absorbent resin was 635, 570, 350 and 300 g / g, respectively. The absorbing properties of AA-HA composite water-absorbing resin in different pH solutions, different ionic strength salt solution and different ambient temperature were discussed. The structure of AA-HA composite water-absorbing resin was characterized by FTIR method. The results showed that AA-HA composite water-absorbing resin was graft copolymer.