基于纳米纤维素涂层的高阻隔透明纸的制备及性能研究

Preparation of High Barrier Transparent Paper Based on Nanocellulose Coating and the Research on its Properties

以自制透明纸作为基底,采用纸张涂布工艺制备了基于纳米纤维素涂层的高阻隔性能纸张。探究了不同涂布量的纳米纤维素对透明纸表面形貌、阻隔性能及力学性能的影响;为进一步改善其防水性,在涂布纳米纤维素涂层的基础上,再赋予聚合物防水涂层。结果表明,纳米纤维素的涂布量为3g/m^(2)时,透明纸抗张强度从原来的9.35kN/m增加至13.27kN/m,提高了41.9%;耐破度从原来的408kPa增加至1254kPa,提高了207.4%;撕裂度从原来的67mN增加至199mN,提高了197.0%。证实涂布纳米纤维素对透明纸的机械性能有所提高。此外,纳米纤维素作为阻氧层,涂布3g/m^(2)后,透明纸氧气透过率降低至2.13cm^(3)/(m^(2)·day·0.1MPa),其阻氧性可与PET(聚对苯二甲酸乙二醇酯)、PA(聚酰胺)等塑料薄膜媲美。增加防水层后,所得涂布透明纸的Cobb(60s)值均小于1g/m^(2),接触角大于90°,其水蒸气透过率较原纸降低了93.4%,呈现良好的疏水性和抗水特性。

Homemade transparent paper as the substrate,a high barrier performance paper based on nanocellulose coating was prepared by coating technology.The influence of different coating weights of nanocellulose on the surface morphology,barrier properties and mechanical properties of transparent paper were investigated,and in order to further improve its waterproofness,the polymer water-proof coating was given on the basis of nanocellulose coating.The results show that the mechanical properties of the coated nanocellulose on the transparent paper are improved,the coating weight is 3 g/m^(2),and the tensile strength of the transparent paper is increased from 9.35 kN/m to 13.27 kN/m,which is increased by 41.9%.The bursting strength is increased from 408 kPa increased to 1254 kPa,which is increased by 201.4%.The tearing strength is increased from 67 mN increased to 199 mN,which is increased by 197.0%.The mechanical properties of transparent paper have been improved.In addition,nanocellulose as an oxygen barrier layer,after coating 3 g/m^(2),the oxygen transmittance rate of transparent paper is reduced to 2.13 cm^(3)/(m^(2)·day·0.1 MPa),and its oxygen transmittance rate is comparable to that of plastic films such as PET(polyethylene glycol terephthalate) and PA(polyamide).After adding the waterproof layer,the Cobb value of the coated transparent paper is less than 1 g/m^(2),the water contact angle is greater than 90°,showing good hydrophobic and water resistance property,and its water vapor transmission rate is reduced by 93.4% compared with the base paper.