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<p>In order to obtain eco-friendly high barrier food packaging paperboard, cationic starch (CAS) was used as the emulsifier to prepare carnauba wax (CW) emulsion, and water and oil resistant food packaging paperboard was fabricated via layer-by-layer rod coating with chitosan (CS) solution and the prepared CAS/CW emulsion. The characteristics of CAS/CW emulsions and the effect of coating process on the water and oil resistance of coated paperboard were investigated. The results showed that the CAS/CW emulsions were composed of spherical particles with a slight surface depression, which showed a good stability and had a particle size distribution ranging from 500 to 2000&#xa0;nm depending upon the CAS concentration and CW dosage. The single layer coated paperboard with CAS1/CW10 emulsion (10&#xa0;g CW was added into 40&#xa0;ml 1% CAS solution) had an excellent water resistance and a poor oil resistance, and the single layer coated paperboard with 2.5% CS solution had an excellent oil resistance and a poor water resistance. When a 2.5% CS solution coating was followed by a CAS1/CW10 coating, the double layer coated paperboard had a Cobb60 value of 4.5&#xa0;g/m<sup>2</sup> and a Kit rating of 12/12, showing excellent water and oil resistance, as well as excellent self-cleaning ability, thermal stability and heat sealability.</p> Graphical abstract <p></p>

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Fabrication of eco-friendly high barrier food packaging paperboard by cationic starch emulsified carnauba wax and chitosan coatings

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Huifang Zhao,
  • Feiyang Zhang,
  • Fangtao Xiong,
  • Jun Yang,
  • Bingqing Fu,
  • Lizheng Sha,
  • Tianzhong Yuan,
  • Daliang Guo,
  • Jing Li

摘要

In order to obtain eco-friendly high barrier food packaging paperboard, cationic starch (CAS) was used as the emulsifier to prepare carnauba wax (CW) emulsion, and water and oil resistant food packaging paperboard was fabricated via layer-by-layer rod coating with chitosan (CS) solution and the prepared CAS/CW emulsion. The characteristics of CAS/CW emulsions and the effect of coating process on the water and oil resistance of coated paperboard were investigated. The results showed that the CAS/CW emulsions were composed of spherical particles with a slight surface depression, which showed a good stability and had a particle size distribution ranging from 500 to 2000 nm depending upon the CAS concentration and CW dosage. The single layer coated paperboard with CAS1/CW10 emulsion (10 g CW was added into 40 ml 1% CAS solution) had an excellent water resistance and a poor oil resistance, and the single layer coated paperboard with 2.5% CS solution had an excellent oil resistance and a poor water resistance. When a 2.5% CS solution coating was followed by a CAS1/CW10 coating, the double layer coated paperboard had a Cobb60 value of 4.5 g/m2 and a Kit rating of 12/12, showing excellent water and oil resistance, as well as excellent self-cleaning ability, thermal stability and heat sealability.

Graphical abstract