高歩留パルプの製造に関する研究-3-リグニンへの親水性基の導入〔リグニンの研究-94-〕

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The introduction of hydrophilic groups into lignin has been investigated with a view to improving high yield pulp. Lignosulfonate (LSA) and thiolignin (TL) were irradiated by γ-ray (5 Mrad) with two vinyl monomers and four lower fatty acids in aqueous media. The results are summarized as follows : (1) The combinations of LSA and methacrylic acid or vinylsulfonic acid were observed by the methods of gel-filtration and paper electropholeisis. As a result, the weekly acidic group of LSA increased from 0.16 to 0.41 eq/OMe in the case of LSA-methacrylic acid, and the sulfonic acid group increased from 0.37 to 0.52 eq/OMe in the case of LSA-vinylsulfonic acid. (2) Weekly acidic group of LSA increased more effectively by acetic acid and propionic acid than by n -butyric acid and isobutyric acid. The tracer experiments showed that propionic acid and n-butyric acid combined with LSA more than acetic acid. (3) Methacrylic acid combined with TL in a small amount of 0.08 eq/C6-C3. (4) The amounts of [1-14C] fatty acids in TL decreases as follows, n -butyric acid>propionic acid>acetic acid.
紙パルプ技術協会の論文