Changes in the hydrophobization efficiency of paper by humidification pretreatment during gas grafting treatment using palmitoyl chloride

초록

The effect of pre-humidification treatment on the efficiency of gas grafting treatment of paper with palmitoyl chloride was investigated. Three types of paper samples containing filter paper, bible paper (thin paper) and glassine paper were humidified under 90% RH conditions, and these samples were then gas grafted by palmitoyl chloride. Changes in fatty acid content, Cobb size degree, brightness, color, and tensile strength of these paper samples were measured. The grafted fatty acid content of filter paper that is the bulky paper made of pure cellulose was increased by humidification pretreatment at 90% RH condition and found to have decreased Cobb size values for cold and hot water. However, an increase in the free fatty acid content was also observed due to an increase in the incidental reaction between fatty acid chloride and moisture. The hydrophobicization efficiency of the other two paper samples did not change by the humidity pretreatment. Humidification pretreatment had little effect on changes in the optical properties and strength of the paper during gas grafting. © 2020 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

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