毛竹半纤维素的提取及其羧甲基化改性研究  

Extraction and Carboxymethylation of Hemicelluloses from Moso Bamboo

作　　者：白雪纯 陈天影 李勉 杨武龙 徐伟冬 郑晓阳 张为宏 唐艳军[1] BAI Xuechun;CHEN Tianying;LI Mian;YANG Wulong;XU Weidong;ZHENG Xiaoyang;ZHANG Weihong;TANG Yanjun(Pulp and Papermaking Research Center,College of Textile Science and Engineering,Zhejiang Sci-Tech University,Hangzhou,Zhejiang Province,310018;Zhejiang Huakang Pharmaceutical Co.,Ltd.,Quzhou,Zhejiang Province,304200;Jiaozuo Huakang Sugar Alcohol Technology Co.,Ltd.,Jiaozuo,He’nan Province,454150)

机构地区：[1]浙江理工大学纺织科学与工程学院制浆造纸研究所,浙江杭州310018 [2]浙江华康药业股份有限公司,浙江衢州304200 [3]焦作市华康糖醇科技有限公司,河南焦作454150

出　　处：《中国造纸》2023年第11期68-77,共10页China Pulp & Paper

基　　金：国家自然科学基金青年项目(22208309);浙江省自然科学基金(LQ21C160006);浙江省重点研发计划(2020C02021);衢州市科技计划项目(2022Z07)。

摘　　要：本研究以毛竹为原料,首先通过碱性过氧化氢法制备半纤维素,再采用超声辅助法对半纤维素进行羧甲基化改性。结果表明,液固比20∶1时半纤维素得率最高,达18.00%。半纤维素羧甲基化改性的最佳工艺条件为:NaOH物质的量浓度1.2 mol/L,氯乙酸物质的量浓度0.6 mol/L,碱化时间及温度分别为40 min、30℃,醚化时间及温度分别为150 min、70℃。随着羧甲基半纤维素取代度的提高,改性前后的半纤维素最大降解温度由257℃提升至300℃,说明羧甲基化改性有助于提升半纤维素的热稳定性;Zeta电位的绝对值由9.98 mV提升至38.00 mV(取代度=0.59),且改性后半纤维素的分散性有了明显提升。In this study,the hemicelluloses were separated from moso bamboo via alkaline hydrogen peroxide method,and then modified by carboxymethylation with ultrasonic assistance.The results showed that the highest hemicelluloses yield of 18.00%was achieved at a liquid to solid ratio of 20∶1.The optimum preparation process was proved as follows:the concentration of NaOH was 1.2 mol/L,the concentra⁃tion of chloroacetic acid was 0.6 mol/L,the alkalization time and temperature were 40 min and 30℃,respectively,the etherification time and temperature were 150 min and 70℃,respectively.With the increase of carboxymethyl hemicellulose substitution degree,the maximum degradation temperature of hemicellulose before and after modification increased from 257℃to 300℃,indicating that carboxymethyl modi⁃fication could improve the thermal stability of hemicelluloses.Moreover,the absolute value of Zeta potential increased from 9.98 mV to 38.00 mV(substitution degree=0.59),and the dispersibility of carboxymethyl hemicelluloses was significantly improved.

关 键 词：毛竹 半纤维素 羧甲基半纤维素 改性 

分 类 号：TS721.2[轻工技术与工程—制浆造纸工程]