腐植酸吸水性树脂的合成及性能研究

以腐植酸(HmA)和丙烯酸(AA)为原料,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸铵(APS)为引发剂,采用自由基共聚反应,通过正交实验合成出了多孔型的腐植酸吸水性树脂(HmA-PAA).研究了多种因素对腐植酸吸水性树脂吸水倍率的影响.其较佳的合成工艺条件为m(NaHm溶液)∶m(AA)=1.65~1.70;n(APS)∶n(AA)=(0.8~1.1)×10-3;n(MBA)∶n(AA)=(0.3~0.5)×10-3;NaOH中和度为75%;反应温度为65℃;反应时间2 h.实验结果表明:合成出的HmA-PAA对蒸馏水和生理盐水(w为0.9%的NaCl水溶液)的吸水能力分别达到650 g/g和52 g/g.与相同条件下所合成的聚丙烯酸吸水性树脂相比,由于腐植酸分子的引入,有效地提高了聚丙烯酸盐类体系吸水、耐盐及耐温能力,具有较高的使用价值.

Synthesis of humic acid absorbent copolymer resin and study on its properties

Porous humic acid resin is synthesized by free radical polymerization,with humic acids and crylic acid being used as raw materials,N,N'-methylenebisacrylamid (MBA) as crosslinker,and ammonium persulfate as initiator.The optimum reaction conditions are determined by orthogonal experiments,i.e.,m(the solution of (NaHm)∶m(AA)=1.65～1.70,n(initiator)∶n(AA)=(0.8～1.1)×10-3,n(MBA)∶n(AA)=(0.3～0.5)×10-3,neutralizing degree of NaOH is 75%,reaction temperature is 65 ℃,and reaction time is 2 h.The water absorbency of humic acid resin is discussed.The results show that the distilled water absorbency of it is 650 g/g,and the saline water (0.9%NaCl) absorbency of it is 52 g/g.Compared with the polyacrylic acid resin synthesized under the same conditions,the water-absorbing capacity,salt resistance and heat resistance of the porous humic acid resin are enhanced due to the existence of humic acid.Therefore it has better application value.