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保水剂因其吸水极强,且对所吸收的水分具有高度的保持作用及反复吸水功能,成为保持土壤水分的有效途径之一。选择常用的“科翰98”、北京汉力淼、法国爱森3种类型保水剂,对保水剂在去离子水中的反复吸释水特性以及不同离子类型对保水剂反复吸释水能力的影响进行研究。结果表明:不同类型、粒径保水剂随着反复吸释水次数的增加,吸水倍率降低。保水剂反复吸释水能力顺序为:爱森>汉力淼>科瀚;大粒径比小粒径降幅更大。各保水剂反复吸释水特性与粒径不成线性规律变化。在反复吸释水条件下,各保水剂吸水速率均高于第1次吸水速率。随着吸释水次数的增加,保水剂凝胶达到饱和的时间提前,对于科瀚影响效应最为明显。2+离子对保水剂的反复吸水能力影响更为显著,其次为1+离子。Zn2+最易使保水剂失效,KNO3对保水剂的影响在前期略大。
Water-retaining agent because of its strong water absorption, and the absorption of water has a high degree of retention and repeated water absorption function, become an effective way to maintain soil moisture. Select commonly used “Kehan 98 ”, Beijing Hanli Miao, France Ai-sen three types of water retention agent, water retention agent in deionized water repeated absorption water characteristics and different types of ionic water retention agent repeatedly absorb water capacity The impact of research. The results show that: with different types, particle size water-retaining agent with the number of repeated suction water increases, reduce the water absorption rate. Super absorbent water holding capacity of the order: Aisen> Hanli Miao> Section Han; large particle size larger than the smaller diameter drop. The repeated water-absorbing agent water characteristics and particle size does not change linearly. Under repeated suction water conditions, the water absorption rate of each SAP was higher than the first one. With the increase in the number of water absorption, water holding agent gel to reach the saturation time ahead, the most obvious effect on the Khan. The effect of 2+ ions on the water absorption capacity of SAP is more significant, followed by 1+ ions. Zn2 + most likely to make water retention agent failure, KNO3 impact on the water retention agent slightly larger in the early.