HA-PAA-CMC高吸水性树脂的制备及性能

Preparation and Properties of HA-PAA-CMC Superabsorbent Resin

采用水溶液聚合法,以羧甲基纤维素(CMC)、腐殖酸(HA)为原料,部分中和的丙烯酸(AA)为接枝单体,N,N′—亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸钾(K2S2O8)为引发剂,制备HA-PAA-CMC复合高吸水性树脂。利用红外光谱、扫描电子显微镜、热重分析等分析手段对复合高吸水性树脂的结构和性能进行测试表征。结果表明,当温度为80℃,AA的中合度为75%,HA的用量为8%(相对于单体AA,下同),CMC的用量为8%,K2S2O8用量为0.6%,MBA用量为0.12%时,合成的复合高吸水性树脂的吸水性能最佳,吸蒸馏水能力最高可达732 g/g,吸盐水倍率可达70 g/g,且产物具有较好的耐热性能。应用结果表明,制得的高吸水性树脂具有良好的缓释控性能,不仅可以提高土壤的保水性能,而且可以改良土壤团粒结构,具有较好的松土效果。

Humic acid （HA）–polyacrylic acid （PAA）–carboxymethyl cellulose （CMC） superabsorbent resin was prepared by solution polymerization using HA,part of neutral AA and CMC as raw materials. N,N＇- methylenebisacrylamide and ammonium persulfate were used as crosslinker and initiator,respectively. The structures and performance of composite resin were studied by FTIR,TG and SEM. The effects of HA content, CMC content, AA neutralization degree, reaction temperature on product water-absorbing performance were evaluated. The results showed that when the neutralization degree of AA was 75%, the polymerization temperature was 80℃,the mass fraction of initiator was 0.6%,the mass fraction of cross-linker was 0.12%,the mass fraction of HA was 8% and the mass fraction of CMC was 8%,the maximum distilled water absorption ability of superabsorbent resin was 732 g/g,salt water absorption rate reached up to 70 g/g and had good heat resistance. The application experiments show that the superabsorbent resin prepared has good sustained release performance, not only can improve the water retention performance of the soil, but also can improve the soil aggregate structure, and has good loose soil effect.