Preparation of absorbent CMC gauze and analysis of its absorbent kinetics

The absorbent capability of fibers can be improved greatly by introducing carboxymethyl group into the cellulosic fiber structure.Carboxymethyl cellulose(CMC) absorbent gauze with different substitution degrees(DS) was prepared using common cotton yarn as raw material through controlling the amount of chloroactic acid(MCA).The absorbent kinetics of CMC with different DS was studied.The results indicated that the CMC absorbent gauze has good absorbent capability.The optimized product had a DS of 43.10% when the mass ratio of MCA to AGU was 2∶1.The higher the DS,the better the absorbent capacity.The absorbency rate and equilibrium adsorption amount of the sample with DS= 43.10% at RH=81% were 18% and 182.39 mg/g,respectively.The second-order model of adsorption kinetic equation characterizes the absorption process well,and the correlation coefficient was higher than 0.999.The calculated values of equilibrium moisture content agree well with the experimental values.