Effect of Hydrophobization of Paper by Gas Grafting on Physical Properties of Recycled Paper

초록

In this study, Hw-BKP handsheets were prepared and treated with gas grafting to achieve hydrophobicity. The study examined the changes in paper strength and water resistance after repeating the recycling and gas grafting process. However, the gas grafting treatment caused a decrease in the strength of the handsheet, presumably due to deterioration of the handsheet by hydrochloric acid, by-product from grafting. Furthermore, the fatty acid reacted on the surface of the fiber acted as an interfering factor with the hydrogen bonding between the fibers, resulting in a reduction in the strength of the handsheet after recycling. Although the water resistance of the handsheet decreased after its first recycling following gas grafting, the study confirmed that repeating the grafting process twice enhanced the handsheet's water resistance even after recycling. Therefore, recycling the grafted paper and repeating the grafting treatment once more is an effective method of hydrophobization to minimize the cellulose fibers' wetting in water. Although the beating treatment restored the recycled handsheet's absorbency, it did not significantly recover the strength or formation of the recycled paper. © 2023 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

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