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羧甲基纤维素(CMC)是一种水溶性纤维素,具有良好的增黏、乳化以及热稳定性,然而其制备的主要原料-精制棉价格高、来源不足。本文以粮食生产的副产物稻壳为原料,先制备纤维素,后采用溶媒法制备得到羧甲基纤维素。通过试验确定醚化温度80℃、纤维素单体和氯乙酸钠的物质的量比1∶4,在此条件下制备的CMC取代度为0.76,黏度为23 MPa·s。FTIR分析表明纤维素的羧甲基化反应已经完成。通过测定不同CMC添加量制备的膜的水蒸汽透过系数(MVP)、透油系数(P0)和断裂强度、断裂伸长率,发现稻壳基CMC具有良好的成膜性能。CMC添加量增加,膜的透水性增强,柔韧性增加。
Carboxymethyl cellulose (CMC) is a water-soluble cellulose with good viscosity, emulsification and thermal stability. However, the main raw material of the preparation - refined cotton is expensive and insufficiently sourced. In this paper, the by-product rice husk of grain production was used as raw material to prepare cellulose, then carboxymethyl cellulose was prepared by solvent method. The etherification temperature is 80 ℃, the ratio of cellulose monomer and sodium chloroacetate is 1: 4, the CMC substitution degree is 0.76 and the viscosity is 23 MPa · s. FTIR analysis indicated that the carboxymethylation of cellulose has been completed. By measuring the water vapor transmission coefficient (MVP), oil permeability coefficient (P0), breaking strength and elongation at break of the films prepared from different CMC additions, we found that rice hull CMC has good film forming properties. Increasing the amount of CMC added, membrane permeability increased, increased flexibility.