Effect of Thermal Conductivity of Heating Roll on Gas Grafting of Paper by Palmitoyl Chloride; 압착가열 롤의 열전도율이 염화팔미토일과 종이의 기상 그라프트 반응에 미치는 영향

초록

Through the gas grafting reaction of palmitoyl chloride, the hydroxyl groups in the pulp fibers can be replaced with alkyl chains, thereby imparting water resistance to the paper. During the gas graft reaction of palmitoyl chloride through hot pressing, it is essential to ensure sufficient heat transfer from the heating roll to the paper before the evaporated palmitoyl chloride dissipates. Therefore, it was expected that a heating roll with higher thermal conductivity would be beneficial for increasing the grafting efficiency. Copper or graphite plates have higher thermal conductivity than the previously used aluminum oxide plates. This study investigated whether using copper and graphite as pressing plates during hot pressing could improve the grafting efficiency of palmitoyl chloride by increasing thermal conductivity of hot press. However, in the case of copper plates, the thermal conductivity decreased due to the formation of copper chloride as a side reaction with hydrochloric acid, and the grafting efficiency was not improved. The graphite plates used in this study were too thick, leading to low heat capacity, which prevented any improvement in grafting efficiency by increasing the thermal conductivity of the heating surface. Further research is needed to find heating roll materials with high thermal conductivity to enable faster grafting of paper and fatty acid chloride. © 2025 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

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