利用羧甲基纤维素钠和海藻酸钠制备纸基复合调湿材料的研究

Preparation of Paper⁃based Composite Humidity⁃controlling Material by Using Sodium Carboxymethyl Cellulose and Sodium Alginate

本文研究了羧甲基纤维素钠(CMC)和海藻酸钠(SA)质量比和涂布量对纸基复合调湿材料的吸放湿性能和调湿能力的影响;将纸基复合调湿材料放入所搭建的可实时检测温度和湿度的密闭微环境中,改变外界环境的相对湿度,评价纸基复合材料(涂布纸)调控密闭微环境湿度变化的能力。结果表明:当CMC和SA的质量比为1∶0.25(标记为C/S2#涂布纸)时,其吸放湿性能和调湿效果最好;当涂布量为34.1 g/m^(2)时,C/S2#涂布纸(相较于未涂布原纸)的湿容量和放湿量分别增加了231.1%和730.9%;与未涂布原纸相比,C/S2#涂布纸(涂布量为34.1 g/m^(2))使密闭微环境的相对湿度受外界高湿环境影响的波动值减少了12.0%,受外界干燥环境影响的波动值减少了9.0%。

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/m^(2),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/m^(2) 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.