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| Study on the Effects of Cationic Starch/Nanocellulose Composite System Sizing on the Properties of Paper |
| Received:September 14, 2024 |
| DOI：10.11980/j.issn.0254-508X.2024.12.007 |
| Key Words:nanocellulose cationic starch food packaging paper mechanical properties barrier properties |
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| 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. |
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