吸水树脂用作土壤持水保墒剂的试验研究

Agricultural Application Study of Super Absorbent Resin

传统高吸水性树脂的耐盐性较差,在实际应用中(尤其在农业应用中)往往造成实际吸水倍率远小于试验室中测定结果的状况。采用新型木质素磺酸钙接枝丙烯酸/丙烯酰胺吸水树脂进行土壤性能试验,木质素磺酸钙含有大量亲水性基团,如磺酸基,羧基等,同时木质素磺酸钙价格低廉,将丙烯酸接枝到木质素磺酸钙既提高吸水倍率,又可降低吸水树脂的成本。试验结果表明,该新型吸水树脂吸自来水倍率230g/g,与传统吸水树脂相比,在保水时间上延长了10d,保水量提高50%,土壤的渗透性得到明显增加,并且具有反复吸水的功能,同时具有良好的膨胀性,能减少蒸发,特别是对增加土壤有效持水,提高地温、提高土壤渗透性有明显作用。

Conventional super absorbent resin is less salt-tolerant. In practice,its application,particularly in agriculture,often results in the result far less than water absorbency measured in laboratory conditions. An experiment was conducted for a new kind of super absorbent resin performance in soil. Calcium lignosulfonate contains a large number of hydrophilic groups,such as sulfonic group,and carboxyl. Calcium lignosulfonate can not only reduce the cost of the water-absorbent resin,but also improve water absorbency. Results showed that water absorbency of the new water-absorbent resin was 230 g/g. Compared with the traditional super absorbent resin,water retention time was extended 10 days,water absorbency was increased by 50%,and soil permeability was increased. The new water-absorbent resin has a repeatedly absorbent function. At the same time,it has a good expansion and can reduce evaporation. Particularly,it plays important roles in enhancing soil available water-absorbency,increasing soil temperature,and improving soil permeability.