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<p>Conventional sizing agents often suffer from limitations such as pH dependency, insufficient hydrophobicity, and delayed development of water repellency. To overcome these drawbacks, this study applied a gas grafting treatment with palmitoyl chloride at 200&#xa0;°C, forming ester bonds with cellulose hydroxyl groups and thereby imparting immediate and stable hydrophobicity. This approach enabled the fibers to retain a portion of hydrophilic surface area, ensuring both water resistance and fiber dispersibility during recycling. Water absorption and recycling performance were compared between gas-grafted handsheets and AKD-sized handsheets under different pulping temperatures. Even with minimal reagent dosage, gas-grafted sheets exhibited markedly lower Cobb values and maintained hydrophobicity after repulping at 50&#xa0;°C, although with some reduction in tensile strength. In contrast, AKD-sized sheets retained mechanical integrity but showed a significant decline in water resistance when exposed to hot conditions, due to the melting and partial dissolution of AKD. Overall, these findings demonstrate that gas grafting with palmitoyl chloride provides a promising strategy for producing recyclable, water-resistant paper or molded pulp, particularly suitable for applications requiring thermal stability such as food packaging and disposable containers.</p>

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Hydrophobic molded pulp based on partially grafted fibers dispersible in water. Part 1: comparison of the physical properties of recycled paper produced from hydrophobized paper treated by gas grafting with palmitoyl chloride or by internal AKD addition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月21日

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  • Han Byul Kim,
  • Kyoung Hwa Choi,
  • Kwang Seob Lee,
  • Philippe Martinez,
  • Jeong Yong Ryu

摘要

Conventional sizing agents often suffer from limitations such as pH dependency, insufficient hydrophobicity, and delayed development of water repellency. To overcome these drawbacks, this study applied a gas grafting treatment with palmitoyl chloride at 200 °C, forming ester bonds with cellulose hydroxyl groups and thereby imparting immediate and stable hydrophobicity. This approach enabled the fibers to retain a portion of hydrophilic surface area, ensuring both water resistance and fiber dispersibility during recycling. Water absorption and recycling performance were compared between gas-grafted handsheets and AKD-sized handsheets under different pulping temperatures. Even with minimal reagent dosage, gas-grafted sheets exhibited markedly lower Cobb values and maintained hydrophobicity after repulping at 50 °C, although with some reduction in tensile strength. In contrast, AKD-sized sheets retained mechanical integrity but showed a significant decline in water resistance when exposed to hot conditions, due to the melting and partial dissolution of AKD. Overall, these findings demonstrate that gas grafting with palmitoyl chloride provides a promising strategy for producing recyclable, water-resistant paper or molded pulp, particularly suitable for applications requiring thermal stability such as food packaging and disposable containers.