Abstract: A composite superabsorbent resin(HA-PAA) for agricultural application was prepared by the surface cross-linking reaction of sulfonated humic acid and poly acrylic acid.N,N′-methylenebisacryamide dissolved in methanol solution was used as surface cross-linking agent.The effect of 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 absorbency was investigated.In contrast with poly acrylic acid, the surface structure of HA-PAA was analyzed by microscopic investigation, and water-absorbing mechanism was explored.The experimental results showed that HA-PAA with 10%(mass) humic acid possessed better water absorbency and electrolyte resistance.Compared with 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 with 0.2% HA-PAA.HA-PAA can be used as water-managing and growth-improving materials for agriculture and horticulture purposes in desert-prone areas.

Key words: 磺化腐殖酸, 聚丙烯酸, 表面交联, 土壤保水性, 高吸水性树脂

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.

关键词: 磺化腐殖酸, 聚丙烯酸, 表面交联, 土壤保水性, 高吸水性树脂