目的 本研究旨在开发一种具有多层功能性结构的生物可降解纸基复合涂层,实现纸基材料的阻隔性能和热封性能协同优化的目的。方法 通过阳离子淀粉（CS）和羧甲基纤维素钠（CMC-Na）填充层改善纸基表面平滑度,聚乙烯醇（PVA）提升纸基气体阻隔性,低分子聚己内酯（PCL）和氢化松香甘油酯黏合层增强阻气层和疏水层之间的界面结合力,高分子PCL和亲油纳米纤维素凝胶（NFC）功能层实现纸基疏水性和热封性。结果 研究表明,10%PVA的涂层氧气透过率仅为0.038 cm3/(m2·d),并且PVA浓度与阻气性能呈正相关关系,但涂层黏度也呈线性上升;通过聚己内酯（PCL）/亲油纳米纤维素（NFC）协同优化疏水热封性,在两者质量比为12∶5时透湿率达25.38g/(m2·24 h),符合GB/T 5048—2017中的Ⅲ级防潮标准,同时其热封强度高达15.94 N/15 mm,符合GB/T 10004—2008的标准要求。结论 生物可降解的高阻隔涂层在阻气性、疏水性和热封性能方面与传统的软包装材料相当,为开发高阻隔性能的纸基包装材料提供了新思路。
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.
关键词
生物可降解 /
纸基涂层 /
阻气性 /
疏水性 /
热封性
Key words
biodegradable /
paper-based coating /
gas barrier property /
hydrophobicity /
heat-sealing property
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基金
广东省普通高校重点领域专项项目（2023ZDZX3096）;广东省普通高校特色创新类项目（2024KTSCX242）;广东省科技创新战略专项资金（“攀登计划”专项资金）项目（pdjh2024b664）;中山市社会公益与基础研究项目（2024B2005）
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