Preparation of Paper-based Composite Humidity-controlling Material by Using Sodium Carboxymethyl Cellulose and Sodium Alginate
In this paper,the moisture absorption/desorption properties and humidity-controlling performance of paper-based composite materials,prepared by different mass ratios of sodium carboxymethyl cellulose(CMC)and sodium alginate(SA)and different coating amounts,were investigated.These paper based humidity-controlling composite materials were put into a sealed and real-time detected micro-environment.When the relative humidity(RH)of external environment was set to a higher or lower level,the controlling performance of paper based composite materials(coated papers)was evaluated to the sealed micro-environment under different"open-close"cyclic operation.The results showed that the C/S2#coated paper,with the mass ratio 1∶0.25 of CMC to SA,exhibited the most favorable moisture absorption/desorption properties.When the coating amount was 34.1 g/m2,the C/S2#coated paper(compared to uncoated base paper)had a significant increase of 231.1%in moisture absorption capacity and 730.9%in moisture desorption capacity.Moreover,the C/S2#coated paperwith a coating amount of 34.1 g/m2 canreduce theamplitude of RH fluctuations by 12.0%in the sealed micro-environment under external high-humidity,and increase the amplitude of RH fluctuations by 9.0%in the sealed micro-environment under external dry condition,as compared to uncoated base paper.
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