壳聚糖/蜂蜡改善纸基材料水蒸气和氧气阻隔性能研究

Study on Improving Water Vapor and Oxygen Barrier Properties of Paper-based Materials by Chitosan/Beeswax

中文关键词:  壳聚糖  蜂蜡  纸基材料  水蒸气  氧气  阻隔性能

Key Words:chitosan  beeswax  paper-based material  water vapor  oxygen  barrier property

中文摘要:

      围绕壳聚糖（CS）和蜂蜡（Wax）在改善纸基材料气体（水蒸气和氧气）阻隔性能方面开展研究，探讨了蜂蜡添加量及其与壳聚糖的复合方式（共混和分层）对纸基材料阻隔性能和涂层热稳定性能的影响。结果表明，涂布纸的水蒸气透过量随蜂蜡添加量的增加而降低，当蜂蜡添加量为15%时，在50% RH（相对湿度）条件下，分层涂布纸和共混涂布纸的水蒸气透过量分别降至21.87和24.13 g/（m²·d），与纯壳聚糖涂布纸相比，分别降低了80.3%和78.2%，分层涂布纸与共混涂布纸的水蒸气透过量差异不大；在75% RH条件下，分层涂布纸（163.69 g/（m²·d））和共混涂布纸（242.24 g/（m²·d））的水蒸气透过量与纯壳聚糖涂布纸相比，分别降低了79.4%和69.5%，而与共混涂布纸相比，分层涂布纸的水蒸气透过量降低了32%。共混涂布纸和分层涂布纸的氧气透过量随着蜂蜡添加量的增加而增大，当蜂蜡添加量为15%时，分层涂布纸和共混涂布纸的氧气透过量仍低至70.19 和101.75 cm³/（m²·d）。

Abstract:

      In this study， the effects of beeswax addition and compounding methods （mixed or layered） of beeswax and chitosan on the barrier performance （water vapor and oxygen） and thermal stability of coating layer of paper-based materials （PBM） were investigated.The results showed that the water vapor transmission （WVT） of coated paper decreased with the increase in beeswax additive amount. When the additive amount of beeswax was 15%， the WVT of layer-coated and mix-coated PBMs were reduced to 21.87 and 24.13 g/（m²·d） at 50% RH， respectively， which were 80.3% and 78.2% lower than that of the pure chitosan-coated paper while the difference in WVT between layer-coated and mix-coated PBMs was slight. Under the condition of 75% RH， the WVT of layer-coated PBM （163.69 g/（m²·d）） and mix-coated PBM （242.24 g/（m²·d）） was reduced by 79.4% and 69.5%， respectively， compared with pure chitosan-coated paper； meanwhile the WVT of layer-coated PBM was reduced by 32% compared with its mix-coated counterpart. The oxygen transmission of the mix-coated and layer-coated PBMs increased with the increase in beeswax additive amount and remained as low as 70.19 and 101.75 cm³/（m²·d）， respectively， at 15% beeswax additive amount.