阳离子淀粉/纳米纤维素复合体系施胶对纸张性能的影响研究

Study on the Effects of Cationic Starch/Nanocellulose Composite System Sizing on the Properties of Paper

关键词:  纳米纤维素  阳离子淀粉  食品包装纸  机械性能  阻隔性能

Key Words:nanocellulose  cationic starch  food packaging paper  mechanical properties  barrier properties

摘要:构建阳离子淀粉（CS）和纳米纤维素（NC）的CS/NC复合体系，探索其在食品软包材料中的应用价值。本研究选取打浆度24 °SR针叶木浆和打浆度36 °SR阔叶木浆作为基纸原料，系统研究了浆内/表面施胶CS/NC复合体系对纸张性能的影响。将CS/NC复合体系用于基纸的浆内施胶，当CS添加量为1.0%（相对于绝干浆，以下同）、纤维素纳米纤丝（J-CNF）添加量0.6%时，纸张的抗张指数和撕裂指数分别达68.6 N·m/g和7.79 mN·m²/g，相较于基纸分别提高14.1%和18.8%。将CS/NC复合体系用于基纸的表面施胶，胶料固含量为6.5%（J-CNC∶CS=1∶9，质量比）时，施胶纸张透气度下降值达99.4%；单面施胶量为6 g/m²时，施胶纸张防油等级可达12级。

Abstract:Cationic starch （CS） and nanocellulose （NC） were used to construct an CS/NC composite system to explore its application value in food soft packaging materials. In this study， softwood pulp and hardwood pulp with beating degrees of 24 and 36 °SR， respectively， were selected as base paper raw materials. A systematic study was conducted on the effects of intra-slurry/surface sizing the CS/NC composite system on the properties of paper. When the CS/NC composite system was applied in intra-slurry sizing， CS was added at a mass fraction of 1.0% （relative to the oven dry fiber weight， hereafter） with cellulose nanofibers （J-CNF） of 0.6%， the tensile index and tearing index of the handmade sheet reached 68.6 N·m/g and 7.79 mN·m²/g， respectively， representing increases of 14.1% and 18.8% compared to the base paper. When the CS/NC composite system was applied in surface sizing， the air permeability of sized paper decreased by 99.4% at cement solid content 6.5%， with a mass ratio cellulose nanocrystal （J-CNC） to CS of 1∶9. Additionally， when the amount of single-sided sizing was 6 g/m²， the oil-proof grade of sized paper achieved grade 12.