CTS-g-PAA/SH高吸水性树脂的缓释和保水性能

【研究目的】以壳聚糖(CTS)、丙烯酸(AA)和腐殖酸钠(SH)为原料，在水溶液中通过接枝共聚反应合成壳聚糖接枝聚丙烯酸/腐殖酸钠(CTS-g-PAA/SH)高吸水性树脂；【方法】考察CTS-g-PAA/SH树脂在不同浓度盐溶液中的溶胀行为、反复吸水性能、SH的缓释性能和在土壤中的实际保水效果；【结果】在SH含量为10%时，CTS-g-PAA/SH树脂在蒸馏水和生理盐水中的吸水倍率分别达到183g/g和41g/g；CTS-g-PAA/SH高吸水性树脂具有较好的反复吸水性能；与CTS-g-PAA相比，含有1.0%CTS-g-PAA/SH树脂的沙土，20d后仍然具有6.75%的保水率；SH能与AA发生聚合反应，形成网络结构，当SH含量超过30%时，过量的SH是以物理填充方式存在于高吸水性树脂的交联网络中，且容易释放；【结论】SH能改善CTS-g-PAA的吸水性，CTS-g-PAA/SH高吸水性树脂不仅可降低产品成本，而且还具有缓释腐殖酸的功能。

Slow-release and Water Absorbency Properties of Chitosan-g-poly(acrylic acid) /sodium Humate Superabsorbent

OBJECTIVE]A novel superabsorbent of chitosan-g-poly(acrylic acid)/sodium humate (CTS-g-PAA/SH) was synthesized through graft polymerization among chitosan, acrylic acid and sodium humate in aqueous solution. METHOD]The water absorbency in various saline solutions, resweling behaviors, the slow-release behavior of SH and the practical water absorbency in soil of CTS-g-PAA/SH superabsorbent were systematically investigated. RESULTS]The CTS-g-PAA/SH superabsorbent with 10% sodium humate gave water absorbency of 183g/g in distilled water and 41g/g in 0.9% NaCl solution. The CTS-g-PAA/SH superabsorbents have better reswelling behaviors. Comparing with CTS-g-PAA, 6.75% of water can still be saved in the sand soil containing 1.0% superabsorbent after 20 days. SH reacts with PAA during the polymerization process and forms a more intact polymeric network. When the SH content is above 30% in superabsorbent, the excess SH only acts as filler in the polymeric network and the slow-release of SH is easy.CONCLUSION]Introducing SH could improve water absorbency of the CTS-g-PAA superabsorbent. CTS-g-PAA/SH superabsorbent not only can reduce significantly production cost, but also have slow-release capacity of humic acid.