纳米纤维素基复合涂料对牛皮包装纸性能的影响

Effect of Nanocellulose-based Composite Coatings on the Properties of Kraft Wrapping Paper

目的探究纳米纤维素(CNF)/疏水纳米二氧化硅(SN-SiO_(2))复合涂料对牛皮纸性能的影响。方法利用甲基三甲氧基硅烷(MTMS)对CNF进行改性,制得硅烷化纳米纤维素(SCNF),并向其中加入不同量的SN-SiO_(2),以物理共混的方式制备涂料,并将其涂布于牛皮纸,探究不同比例的SCNF/SN-SiO_(2)复合涂层材料对牛皮纸阻隔水蒸气性能、氧气透过性能、抗水性能和拉伸性能的影响。结果SCNF/SN-SiO_(2)复合涂布纸的氧气透过率显著增大,最大可达到302.569 cm^(3)/(m^(2)·d·0.1 MPa),质量分数为1%的SN-SiO_(2)涂布纸的阻隔水蒸气能力最佳,2%的SN-SiO_(2)涂布纸的Cobb60值和Max值表现出最佳的抗水性能;质量分数为1%的SN-SiO_(2)涂布纸的抗张指数和断裂伸长率最优,分别提升了5.34%、5.26%。结论采用SCNF/SN-SiO_(2)复合涂层材料既能提高复合涂布纸的阻隔水蒸气性能,又能提高其透气性能,显著提升了涂布纸的抗水性能,而对其拉伸性能的影响不大。所制备的涂布牛皮纸展现出良好的阻隔水蒸气性能和透气性能,有望应用于化橘红和陈皮的包装储藏,使其在有氧气陈化的同时免受水蒸气的影响,为开发绿色环保包装提供了新思路。

The work aims to investigate the effect of nanocellulose(CNF)and hydrophobic nano-silica(SN-SiO_(2))composite coatings on the properties of kraft wrapping paper.Methyltrimethoxy-silane(MTMS)was used to modify CNF to prepare silanized nanocellulose(SCNF).Different amounts of SN-SiO_(2) were added to prepare the coatings by physical blending,and the coatings were applied to kraft paper.Then,the effects of different amounts of SCNF/SN-SiO_(2) composite coating materials on the water vapor barrier properties,oxygen permeability properties,water resistance,and tensile properties of kraft wrapping paper were investigated.The oxygen permeability of SCNF/SN-SiO_(2) composite coated paper increased significantly,reaching a maximum of 302.569 cm^(3)/(m^(2)·d·0.1 MPa),and the 1%SN-SiO_(2) coated paper had the best water vapor barrier properties.The paper with Cobb60 value and Max value of 2%SN-SiO_(2) showed the best water resistance.The tensile index and elongation at break of 1%SN-SiO_(2) coated paper were the best,increasing by 5.34%and 5.26%.SCNF/SN-SiO_(2) composite coating material not only improves the water vapor barrier property of the coated paper but also improves the oxygen permeability property and the water resistance of the coated paper significantly,and has little effect on the tensile property.The coated paper with water vapor barrier and good oxygen permeability prepared in this work is expected to be used in the packaging and storage of tangerine and orange peel of Chinese medicinal materials.It is free from the effect of water vapor while aging with oxygen,which provides a new idea for developing green environmental protection packaging.