改性纤维素纳米纤丝涂布制备高阻隔长纤维薄页纸的研究

Research on Preparation of Barrier Long Fiber Tissue Paper Coated with Modified Cellulose Nanofibril

关键词:  纤维素纳米纤丝（CNF）  羧甲基改性  阻隔性能  疏水性  薄页纸

Key Words:cellulose nanofibril （CNF）  carboxymethyl modification  barrier properties  hydrophobicity  tissue paper

摘要:本研究以高透气、高强度的长纤维薄页纸为基材，利用纤维素纳米纤丝（CNF）和烷基烯酮二聚物（AKD）乳液涂布制备一种高强度、高透光、柔软的高阻隔长纤维薄页纸。比较了CNF、羧甲基化改性纤维素纳米纤丝（C-CNF）、AKD等对涂布后纸张的抗张强度、透气度、水蒸气透过率、表面疏水性能等的影响。结果表明，C-CNF较CNF表现出更优异的性能，当涂布液浓度为1.0%（涂布量1.6 g/m²）时，纸张抗张指数为27.3 N·m/g，较只涂布AKD提高了46.0%；水与纸面接触角达到121.5°，较CNF涂布的疏水效果进一步提高，相比只涂布AKD的纸张增大了60.9%；同时透气度则仅有21.1 μm/(Pa·s)，较CNF涂布纸的透气度进一步降低，相较只涂布AKD的纸张降低了60%；水蒸气透过率为1.95×10^-11 g·m/（m²·s·Pa），为只涂布AKD的纸张的52%，具有良好的疏水阻隔性能。

Abstract:In this paper， long-fiber tissue paper with high air permeability and high wet strength was used as the substrate， high-strength， high-transmittance， and soft long-fiber tissue paper with high barrier properties was prepared by coating modified cellulose nanomaterial. The effects of cellulose nanofibril （CNF）， carboxymethylated modified cellulose nanofibril （C-CNF） and AKD dosages on the tensile strength air permeability and surface hydrophobicity of the coated paper were compared. The results showed that C-CNF exhibited better performance than CNF. When its coating concentration was 1.0%（coating amount 1.6 g/m²）， the tensile index was 27.3 N·m/g， increased 46.0% compared to that of AKD coated paper. The contact angle between water and paper surface reached 121.5°， which was more hydrophobic than CNF coating， and compared to the sample coated with AKD emulsion，the hydrophobicity increased by 60.9%， while the air permeability was only 21.1 μm/（Pa·s）， which was further lower than that of CNF coated paper sample and 60% lower than the sample coated with AKD emulsion， the water vapor permeablity was 1.95×10^-11 g·m/（m²·s·Pa）， 52% of that coated with AKD.The prepared paper had a good hydrophobicity barrier performance.