【摘要】 将交联剂N,N′-亚甲基双丙烯酰胺溶于甲醇溶液制成表面处理液,通过表面交联反应将磺化腐殖酸(HA)与聚丙烯酸(PAA)结合,制得一种适合于农林领域应用的腐殖酸-聚丙烯酸高吸水性树脂(HA-PAA).研究了表面处理液浓度、交联剂用量和腐殖酸量对HA-PAA吸水性能的影响规律和吸水机理,以及产物在沙土中的保水性能,并通过扫描电镜分析了HA-PAA的表面结构.研究结果表明,当含有10%HA时,HA-PAA耐电解质性能良好,吸水性能最佳;当沙土中添加0·2%的HA-PAA时,可明显改善沙土的贮水、保水性能.HA-PAA作为农林领域用保水剂,可发挥抗旱保墒和促进植物生长的双重作用.更多还原

【Abstract】 A composite superabsorbent resin(HA-PAA) for agricultura l application was prepared by the surface cross-linking reaction of sulfonated humic acid and poly acrylic acid.N,N′-methylenebisacryamide diss olved in methanol solution was used as surface cross-linking agent.The effect o f the ratio of sulfonated humic to poly acrylic acid, the concentration of cross -linking agent, and volume ratio of methanol to deionized water on water absorb ency was investigated.In contrast with poly acrylic acid, the surface structure of HA-PAA was analyzed by microscopic investigation, and water-absorbing mecha nism was explored.The experimental results showed that HA-PAA with 10%(mass) hu mic acid possessed better water absorbency and electrolyte resistance.Compared w ith the sample of poly acrylic acid, the water retention of HA-PAA in sand was also studied.The water retention of the sand was enhanced greatly when mixed wit h 0.2% HA-PAA.HA-PAA can be used as water-managing and growth-improving mat erials for agriculture and horticulture purposes in desert-prone areas.更多还原