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학술대회자료
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한국펄프·종이공학회 한국펄프종이학회 기타 간행물 Pre-symposium of the 10th ISWPC
발행연도
1999.6
수록면
101 - 106 (6page)

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Mechanisms of paper sizing by reactive sizes such as alkylketene dimers (AKD), alkenylsuccinic anhydrides (ASA) and fatty acid anhydrides (FAA) arc reviewed on the basis of the results obtained in our laboratory. Solid-state ¹ ³C-NMR analysis of cellulase-treated residues of handsheets prepared with ¹ ³C-labeled sizes showed that the size components are present primarily as hydrolyzed products, without forming covalent bonds with hydroxyl groups of cellulose in the handsheets. Furthermore, most size components in handsheets were removed by stirring the defibrated handsheets in water with Tween 80 at 70℃ for 4 h. Thus, the hydrolyzed products of size molecules consequently contribute to sizing performance for the reactive size-treated papers. Scanning electron microscopic observations revealed that the chemical structures of reactive sizes are necessary for efficient paper sizing to achieve homogenous distribution of hydrophobic size components on hydrophilic pulp fiber surfaces in the papermaking process, where water is always present. Size reversion is presumably explained in terms of partial introduction of hydrophilic groups into the size molecules by auto-oxidation. Therefore, mechanisms of paper sizing by reactive sizes can be rationalized, without introducing the covalent bond formations. by changes in chemical structures of the size molecules from hydrophilic to hydrophobic by hydrolysis in papermaking process. Model experiments using a cellulose-AKD ester sample also supported these mechanisms.

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