Preparation and Properties of Bio-based High-barrier and Heat-sealable Coatings

ZHAO Sufen; LI Xinfang; ZHANG Yuling; LI Peng; LI Tao; WANG Linming

doi:10.19554/j.cnki.1001-3563.2026.13.016

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (13) : 143-147. DOI: 10.19554/j.cnki.1001-3563.2026.13.016

Special Topic on Applications of High-Performance Fibers and Their Composites in Protection and Packaging

Preparation and Properties of Bio-based High-barrier and Heat-sealable Coatings

ZHAO Sufen¹, LI Xinfang^1*, ZHANG Yuling², LI Peng¹, LI Tao², WANG Linming²

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Abstract

The work aims to develop a biodegradable paper-based composite coating with a multi-layer functional structure to achieve the goal of synergistically optimizing the barrier and heat-sealing properties of paper-based materials. The surface smoothness of the paper substrate was improved by a filling layer of cationic starch (CS) and sodium carboxymethyl cellulose (CMC-Na), the gas barrier property of the paper substrate was enhanced by polyvinyl alcohol (PVA), the interfacial adhesion between the gas barrier layer and the hydrophobic layer was strengthened by low-molecular-weight polycaprolactone (PCL) and hydrogenated rosin glyceride adhesive layer, and the hydrophobicity and heat-sealing property of the paper substrate were achieved by a functional layer of high-molecular-weight PCL and oleophilic nanofibrillated cellulose gel (NFC). The oxygen transmission rate of the coating with 10% PVA was only 0.038 cm³/(m²·24 h·0.1 MPa), and the concentration of PVA was positively correlated with the barrier property, but the viscosity of the coating also increased linearly. By optimizing the composite moisture-proof and heat-sealing layer of polycaprolactone (PCL)/oleophilic nanofibrillated cellulose (NFC), the moisture permeability reached 25.38 g/(m²·24 h) when the mass ratio of the two was 12∶5, meeting the Grade III moisture-proof standard in GB/T 5048-2017, and its heat-sealing strength was as high as 15.94 N/15 mm, meeting the requirements of GB/T 10004-2008. The biodegradable high-barrier coating has barrier, hydrophobic and heat-sealing properties comparable to those of traditional flexible packaging materials, providing a new idea for the development of high-barrier paper-based packaging materials.

Key words

biodegradable / paper-based coating / gas barrier property / hydrophobicity / heat-sealing property

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ZHAO Sufen, LI Xinfang, ZHANG Yuling, LI Peng, LI Tao, WANG Linming. Preparation and Properties of Bio-based High-barrier and Heat-sealable Coatings[J]. Packaging Engineering. 2026, 47(13): 143-147 https://doi.org/10.19554/j.cnki.1001-3563.2026.13.016

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