【作者】 沈葵忠； 房桂干； 胡剑民； 李萍； 梁芳敏；

【Author】 SHEN Kui-zhong ,FANG Gui-gan ,HU Jianmin,LI Ping, LIANG Fangmin Institute of Chemical Industry of Forest Products,CAF, Nanjing 2100042,China

【机构】 中国林业科学研究院林产化学工业研究所；

【摘要】 本文对慈竹单段漂白和多段组合漂白性能进行了系统研究,提出了慈竹化机浆漂白至高白度的工艺。研究结果表明:H2O2总用量10%,慈竹化机浆经单段过氧化氢漂白,白度只能达到64%～65%ISO;两段过氧化氢漂白具有较高的漂白效率,漂白白度达到66.7%～67.1%ISO;总漂剂用量为12%的三段组合漂白,可以实现69%～73%ISO的高白度。三段漂白中结束段分别使用H2O2、FAS和Na2S2O4不同漂白方式,FAS漂白效率最优,白度达到72.6%ISO;其次是H2O2漂白,白度为71.9%;以FAS为结束段的漂白,与本色慈竹化机浆相比,抗张指数、耐破指数和撕裂指数分别提高200%～300%、250%～300%和250%～270%。采用碱性亚硫酸钠化学预浸渍,两段过氧化氢漂白加一段FAS漂白的三段组合漂白,慈竹化机浆可漂白至71%以上白度满足配抄漂白纸种生产。更多还原

【Abstract】 Bleaching of chemimechanical pulps from a bamboo species Neosinocalamus affinis (Rendle) Keng f to a higher brightness single- and multi-stage processes are discussed in this paper. By using 10% H2O2, the bamboo pulps were able to be only brought to a brightness of 64-65% ISO. Bleaching efficiency was improved by using two-or three-stage process. The brightness of 66.7-67.1% ISO was obtained by two-stage bleaching at 10% H2O2 charge in total. Bleaching effects by using three bleaching chemicals of H2O2, FAS and NaS2O4 in the end stage of the three-stage process were compared in term of brightness: FAS>H2O2>NaS2O4. The brightness of 69-73% ISO was covered by three-stage process at the bleaching chemicals of 10% H2O2 and 2% FAS. After bleaching, the tensile, tear and burst indices of of the bamboo pulps were increased by 200-300%, 250-300%, and 250-270%, respectively. The effects of two kinds of chemi-pretreatment of bamboo chips on brightness and strength properties of the bleached pulps were compared as well.更多还原