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中国农学通报

中国农学通报 ›› 2008, Vol. 24 ›› Issue (5): 0-.

所属专题： 园艺

• 工程 机械 水利 装备 •    

聚(丙烯酸-co-丙烯酰胺)/膨胀蛭石/腐殖酸钠复合
高吸水性树脂的溶胀和缓释性能研究

华水波,, 杨 逵,王爱勤   

  • 修回日期:1900-01-01 出版日期:2008-05-05 发布日期:2008-05-05

Study on Swelling Behaviors and Slow-Release of Poly(acrylic acid-co-acrylamide)/Expanded Vermiculite /Sodium Humate Superabsorbent Composite

Hua Shuibo, , Yang Kui, Wang Aiqin   

  • Revised:1900-01-01 Online:2008-05-05 Published:2008-05-05

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1073

摘要： 【研究目的】以丙烯酸(AA)、丙烯酰胺(AM)、腐殖酸钠(SH)和膨胀蛭石(EVMT)为原料，在水溶液中通过共聚反应合成聚(丙烯酸-co-丙烯酰胺)/膨胀蛭石/腐殖酸钠复合高吸水性树脂(P(AA-AM)/EVMT/SH)；【方法】考察在不同种类盐溶液中的溶胀行为、反复吸水性能、在土壤中的实际保水效果和SH的缓释性能；【结果】在EVMT含量为30%和SH含量为10%时，树脂在蒸馏水和生理盐水中的吸水倍率分别达到426和45g/g；树脂的吸水能力随着外界盐溶液浓度的增大而降低，在相同的浓度下，对吸水倍率的影响趋势是PO43->Cl->SO42-和Na+> Ca2+> Fe3+；含有1.0%树脂的土壤在20天后含水量仍有最初的24.6%。【结论】与P(AA-AM)/EVMT相比，引入SH制备的P(AA-AM)/EVMT/SH不仅具有更好的反复吸水性能，而且还具有缓释腐殖酸钠的功能。

关键词: 冬小麦, 冬小麦, 夏玉米, 产量, 硝态氮

Abstract: 【OBJECTIVE】A novel superabsorbent of poly(acrylic acid-co-acrylamide)/expanded vermiculite/sodium humate was synthesized through aqueous solution polymerization among acrylic acid, acrylamide, expanded vermiculite and sodium humate. 【METHOD】The water absorbency in various saline solutions, resweling behaviors, the practical water absorbency in soil and the slow-release behavior of sodium humate of poly(acrylic acid-co-acrylamide)/expanded vermiculite/sodium humate superabsorbent composite were systematically investigated. 【RESULTS】The poly(acrylic acid-co-acrylamide)/expanded vermiculite/sodium humate superabsorbent with 30% EVMT and 10% SH gave the water absorbency 426 g/g in distilled water and 45 g/g in 0.9 % NaCl solution; Water absorbency of the superabsorbent decreased with increasing the concentration of the various saline solution, and the water absorbency was in the order PO43->Cl->SO42- and Na+> Ca2+> Fe3+ at the same concentration; 24.6% of water can still be saved in the soil containing 1.0% superabsorbent after 20 days.【CONCLUSION】The incorporation of sodium humate into poly(acrylic acid-co-acrylamide)/expanded vermiculite polymeric network not only improved the reswelling capacity, but also endowed the slow-release capacity of the superabsorbent.