低共熔溶剂耦合机械打浆制备微纳米纤维素的研究

Study on Micronanocellulose Produced by Deep Eutectic Solvent Coupled with Mechanical Beating

关键词:  低共熔溶剂  预处理  机械打浆  微纳米纤维素  结构变化

Key Words:deep eutectic solvent  pretreatment  beating  micronanocellulose  structural change

摘要:本研究选取“绿色”低共熔溶剂（DES，乳酸/盐酸甜菜碱）添加不同体积分数去离子水，对桉木片进行预处理，并结合打浆和氧化处理方式，对木质纤维素进行微纳米纤维化研究。结果表明，该DES在添加体积分数5%去离子水时，具有最佳的预处理效果，即纤维素的保留率为62.9%、半纤维素和木质素的去除率分别为91.8%和82.9%，且纤维素保持Ⅰ型结晶结构。经过打浆和氧化处理后木质纤维素细纤维化作用明显，纤维质均长度和质均宽度分别减小了47.7%和49.9%，使得纤维表面电荷明显增强，Zeta电位绝对值最大达到51.65 mV。

Abstract:The “green” deep eutectic solvent （lactic acid/betaine hydrochloride） with different volume fraction of deionized water was used to pretreat eucalyptus and to study the micro and nanofibrillation of lignocellulose in combination with beating and oxidation treatment. The results showed that the DES had the best pretreatment effect when volume fraction of 5% deionized water was added. At this time， the retention rate of cellulose was 62.9%， the removal rates of hemicellulose and lignin were 91.8% and 82.9%， respectively， and the cellulose maintained the type I crystalline structure. After the beating and oxidation treatment， the micro fibrillation of lignocellulose was obvious， and the average length and average width of fiber were shortened by 47.7% and 49.9%， respectively， and the surface charge of fiber was also significantly enhanced， and the maximum absolute value of Zeta potential reached 51.65 mV.