蔗渣纤维制备高吸水树脂研究

Study on preparation of super absorbent resin from bagasse fiber

摘要:

以甘蔗渣为原料，通过超声波辅助碱性双氧水法进行预处理，接枝改性制备具有高吸水、保水性能的高吸水树脂. 研究了丙烯酸/蔗渣配比、引发剂用量、交联剂用量、中和度等因素对高吸水树脂吸水性能的影响；采用傅里叶红外光谱(IR)、X射线衍射(XRD)、扫描电镜(SEM)分别对预处理前后蔗渣及高吸水树脂进行接枝情况、结晶情况、结构与形貌进行表征. 结果表明: 最佳条件为丙烯酸/蔗渣配比10 mL/g、引发剂用量0.12 g、交联剂用量4 mg、中和度80%；对蔗渣纤维的预处理能够明显提高树脂的吸水性能；室温放置72 h，对去离子水的保水率为97%. 该树脂对去离子水、自来水、0.9% NaCl溶液的吸水倍率分别为413、104和14 g/g.

Abstract:

Bagasse was used as raw material to prepare super absorbent resin with a high water absorption and retention by pretreatment-ultrasonic assisted aquae hydrogenii dioxidi treatment and graft modification. The effects of the ratio of acrylic acid/bagasse, the dosage of initiator, the amount of crosslinker, the neutralization degree on water absorption capacity of resin were studied. IR, XRD and SEM were used to investigate the grafting situation, crystallization, structure and morphology of the bagasse before and after pretreatment and super absorbent resin. The results show that the optimum condition is that the ratio of acrylic acid/bagasse, the dosage of initiator, the amount of crosslinker, and the neutralization degree are 10 mL/g, 0.12 g, 4 mg and 80%, respectively. The pretreatment of bagasse fiber can obviously improve the water absorption of resin. The water absorption capacities of resin in deionized water, running water and 0.9%NaCl solution are 413, 104 and 14 g/g, respectively. The water retention rate of resin reaches 97% by treating the deionized water saturated resin when placed at room temperature for 72 hours.