环保型PLA/CNF应用于纸张阻隔性涂布的研究

Study on the Application of Environmental Friendly PLA/CNF in Paper Barrier Coating

中文关键词:  可降解  聚乳酸  改性纤维素纳米纤丝  阻隔保鲜纸

Key Words:degradable  polylactic acid  modified cellulose nanofibrils  preservative paper with barrier property

中文摘要:

      以聚乳酸（PLA）为基体、乙酰化改性纤维素纳米纤丝（m-CNF）为增强材料制得复合涂料，将其涂覆于A4纸表面制得PLA/m-CNF阻隔纸，探讨了复合涂料中m-CNF添加量对纸张阻隔性能、疏水性能、强度性能等的影响。结果表明，与原纸相比，当m-CNF添加量为3%时，PLA/m-CNF3%阻隔纸的抗张指数、耐破指数、疏水性能分别提高了30.6%、40.1%、24.8%，透气度降低了36.6%。原纸水蒸气透过量为1815 g/（m²·d），PLA/CNF阻隔纸的氧气和水蒸气阻隔性能相较原纸显著提升；其中，PLA/CNF3%阻隔纸的水蒸气透过量为443 g/（m²·d）、氧气透过量为45 cm³/（m²·d·（0.1 MPa））；PLA/m-CNF3%阻隔纸的水蒸气透过量为385 g/（m²·d）、氧气透过量为35 cm³/（m²·d·（0.1 MPa）），与PLA/CNF3%阻隔纸相比，分别下降了13.1%和22.2%；表明PLA/m-CNF阻隔纸具有优异的保鲜效果。

Abstract:

      Polylactic acid （PLA） as matrix and acetylated modified cellulose nanofibril （m-CNF） as reinforcing material were used to prepare composite coating which was coated on the surface of A4 paper to prepare PLA/m-CNF barrier paper， and effects of additive amount of m-CNF in composite coating on barrier property， hydrophobicity， and strength of the barrier paper were discussed. Compared with base paper， when the additive amount of m-CNF is 3%， the tensile index， burst index， and hydrophobicity of the PLA/m-CNF3% barrier paper increase by 30.6%， 40.1%， and 24.8%， respectively， while the air permeability decreases by 36.6%. The water vapor transmission of base paper is 1815 g/（m²·d） whereas PLA/CNF barrier paper significantly improves the barrier performance on oxygen and water vapor with water vapor transmission of PLA/CNF3% barrier paper of 443 g/（m²·d） and oxygen transmission of 45 cm³/（m²·d·（0.1 MPa）‍）. Compared with PLA/CNF3% barrier paper， the water vapor （385 g/（m²·d）） and oxygen （35 cm³/（m²·d·（0.1 MPa））） transmission of PLA/m-CNF3% barrier paper decreases by 13.1% and 22.2%， respectively， indicating the excellent barrier and preservative performance of the as-prepared PLA/m-CNF barrier paper.