麦草化学机械浆漂白机理的研究

Research on Bleaching Mechanism of Wheat Straw Chemi-mechanical Pulp

关键词:  麦草化学机械浆  NaBH₄  H₂O₂漂白  麦草木质素

Key Words:wheat straw chemi-mechanical pulp  sodium borohydride  peroxide bleaching  lignin of wheat straw

摘要:对经碱性H₂O₂漂白以及NaBH₄还原处理后麦草化学机械浆的木质素结构进行了分析研究。结果表明，麦草化学机械浆经碱性H₂O₂漂白后总羰基含量减少了26.4%，后续NaBH4还原处理后木质素中共轭羰基数量又减少了70.0%，漂白破坏了木质素中的发色基团。

Abstract:Lignin structures in wheat straw materials, its chemi-mechanical pulps, the pulps bleached with alkaline H₂O₂ and the pulps treated by H₂O₂/NaBH₄ were determined in this paper. The results showed that conjugated carbonyl content in the lignin of H₂O₂ bleached chemi-mechanical pulp decreases by 26.4%, conjugated carbonyl in the lignin of the pulp treated by NaBH₄ further decreases by 70.0%. The chromophore in the lignin is broken by bleaching, which improves the pulp brightness.