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

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/m^2)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21.1μm/(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^-11g·m/(m^2·s·Pa),为只涂布AKD的纸张的52%,具有良好的疏水阻隔性能。

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 per⁃formance than CNF.When its coating concentration was 1.0%(coating amount 1.6 g/m^2),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 hydropho⁃bic than CNF coating,and compared to the sample coated with AKD emulsion,the hydrophobicity increased by 60.9%,while the air permea⁃bility was only 21.1μm(/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(/m^2·s·Pa),52%of that coated with AKD.The prepared paper had a good hydrophobicity barrier performance.