不同多羟基聚合物涂层对涂布纸吸放湿性能和调湿能力的影响研究

Study on the Influence of Different Hydroxy-based Polymer Coatings on the Moisture Absorption/Desorption Properties and Humidity Control Capability of Coated Paper

关键词:  海藻酸钠  聚乙烯醇  羧甲基纤维素钠  吸放湿性能  调湿能力

Key Words:sodium alginate  polyvinyl alcohol  CMC  moisture adsorption/desorption property  moisture control performance

摘要:对3种多羟基聚合物涂层和涂布量对涂布纸的吸放湿性能和调湿效果的影响进行了研究，并搭建了一套实时检测密闭微环境湿度变化的实验装置，探讨了密闭微环境在外部环境相对湿度影响下利用涂布纸调控其湿度变化的可行性。结果表明，海藻酸钠（SA）、聚乙烯醇（PVA）和羧甲基纤维素钠（CMC）3种多羟基聚合物涂布纸相比，CMC涂布纸的吸放湿性能和调湿效果最好；涂布量为8.5 g/m²时，CMC涂布纸（相较于未涂布原纸）的湿容量和放湿量分别增加了70.2%和234.2%；经4次开合后，与未涂布原纸相比，CMC涂布纸（涂布量为34.1 g/m²）使密闭微环境的相对湿度波动值，在高湿环境下降低了11.5个百分点，在干燥环境下升高了8.6个百分点。

Abstract:This study investigated the influence of three different hydroxy-based polymer coatings and coating weights on the moisture absorption/desorption properties and humidity control performance of coated paper. Additionally， an evaluation system was developed to real-time detect humidity changes in a sealed microenvironment， aiming to explore the feasibility of using coated paper for humidity control in such environments under various external humidity conditions. The results showed that the sodium carboxymethyl cellulose （CMC） coated paper exhibited the most favorable moisture absorption/desorption properties and humidity control performance compared to sodium alginate （SA） and polyvinyl alcohol （PVA） coatings. Specifically， when the coating weight was 8.5 g/m²， the CMC coated paper （compared to uncoated base paper） showed a significant increase of 70.2% in moisture absorption capacity and 234.2% in moisture desorption capacity. Under the effect of high humidity or dry environment， after four opening and closing， compared with the uncoated base paper， CMC coated paper （with a coating weight of 34.1 g/m²） could reduced and inoreased the humidity fluctuation vaue of closed microenvironment by 11.5 and 8.6 percentage points， respectively.