Artificial aging characteristics of hydrophobic hanjis grafted by gaseous palmitoyl chloride

초록

This study was conducted to investigate the effects of gas grafting treatment on the durability of Korean traditional paper i.e., Hanji. Dry heating- and humid heating-accelerated aging tests were performed. Further, the properties of each Hanji sample, including strength, optical property, Cobb size degree, and static contact angle, were analyzed. The decrease in the strength and optical characteristics of the Hanji hydrophobized via gas grafting with palmitoyl chloride during artificial aging was found to be more significant than that of untreated paper. The decrease in durability was speculated to be caused by the residual free fatty acids in the Hanji. In contrast, no changes in the Cobb size and static contact angle of the hydrophobic Hanji occurred during accelerated aging. In summary, the hydrophobicity of Hanji grafted with palmitoyl chloride remained unchanged during 30 days of dry-heating aging and 60 days of humid-heating aging, however, the durability of paper material, including strength and optical properties, deteriorated. Therefore, the attenuation and elimination of residual free fatty acids must be investigated to prevent the decrease of durability. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

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