蔗渣/羟丙基淀粉/丙烯酸复合高吸水树脂降解性能分析

Degradation property of bagasse/hydroxypropylated starch/acrylic acid composite super absorbent polymer

【目的】考察蔗渣/羟丙基淀粉/丙烯酸复合高吸水树脂的降解性能,为复合高吸水树脂的开发与应用提供参考依据。【方法】以蔗渣和羟丙基淀粉为原料制备复合高吸水树脂,分别将其掩埋于土壤中、放置于土壤表面、浸渍于1 mol/L HCl、0.9%Na Cl和1 mol/L Na OH溶液中,采用失重法研究该复合高吸水树脂的降解率与处理时间的变化关系,并进行SEM检测。【结果】蔗渣/羟丙基淀粉/丙烯酸复合高吸水树脂在化学溶液中的降解率大于土壤掩埋法和土壤表面放置法初期的降解率。溶液浸渍法中,复合高吸水树脂在1 mol/L Na OH溶液中的降解率最大,降解7 d后,树脂外表层破碎;其次是0.9%Na Cl溶液,降解率最低为1 mol/L HCl溶液。复合高吸水树脂在土壤中和土壤表面的降解过程均呈先缓后快的变化趋势,降解至63 d,经土壤掩埋的树脂表面破碎、凹凸不平、有颗粒,且降解率(47.52%)明显大于在土壤表面的降解率(13.16%)。【结论】复合高吸水树脂经不同方法处理的降解程度不同,综合考虑降解速率、处理成本和环保等因素,以土壤掩埋法较适用。

【Objective】The degradation property of bagasse/hydroxypropylated starch/acrylic acid composite super absorbent polymer was investigated, in order to provide reference for development and application of composite super absorbent polymer. 【Method】Using bagasse and hydroxypropylated starch as materials, the composite super absorbent polymer was prepared, then degraded by being buried in soil, put on soil surface, and macerated in 1 mol/L HCl, 0.9% Na Cl and 1 mol/L Na OH, respectively. Moreover, the relation between degradation rate and treated time was investigated by weight-loss method. 【Result】The degradation rate of composite super absorbent polymer macerated in chemical solutions was higher than initial degradation rates of composite super absorbent polymer using soil-burial and soil-surface method.As for maceration method, 1 mol/L Na OH solution showed the highest degradation rate of composite super absorbent polymer, followed by 0.9% Na Cl solution, then 1 mol/L HCl solution. Furthermore, using soil-burial and soil-surface methods, the composite super absorbent polymer degraded slowly first and then fast, until 63 d, the surface of composite super absorbent polymer using soil- burial method was broken, ragged and covered with graules, and its degradation rate（ 47. 52 %） was higher than that using soil- surface method（13.16%）. 【Conclusion 】Using different degradation methods, the composite super absorbent polymer is degraded to different extents. Thus, considering degradation rate,cost and environmental protection, soil-burial method was desirable.