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高得率纸浆残余木质素中对紫外光和近紫外光高度敏感的特定化学结构 ,结合大气中的氧分子 ,通过形成游离基中间体而产生发色物质 ,导致高得率纸浆的光返色 (返黄 )。紫外吸收类化合物、游离基捕获剂或抗氧剂等处理纸张制止纸张返色的研究已有报道。本文研究了杨木APMP纸浆手抄片添加紫外吸收类化合物 (Tinuvin 1130及其前驱物 )、游离基捕获剂 (氮氧游离基化合物 )和抗氧剂 (PEG 30 0 )等的工艺条件和方法 ,对比研究了不同溶剂介质下 (有机型和水溶液 ) ,添加剂对杨木APMP原浆和还原处理白度稳定性效果。结果表明 ,Tinuvin 1130与脂肪醇混合物处理还原后 ,纸浆抗光诱导返色效果尤为显著 ,该技术方法十分接近工业应用条件 ,具有潜在的工业应用价值。
The specific chemical structure of high-yield pulp lignin, which is highly sensitive to UV and near-UV light, combines oxygen molecules in the atmosphere with the formation of free-radical intermediates to produce chromogenic materials that lead to light retouch of high-yield pulps (Back to yellow). Studies have been reported on the use of UV-absorbing compounds, radical trapping agents or anti-oxidants to prevent the paper from turning back to paper. In this paper, we studied the process conditions and methods for adding poplar APMP pulp hand-copied tablet with UV absorbing compounds (Tinuvin 1130 and its precursors), free radical scavengers (nitroxides) and antioxidants (PEG 30 0) , Comparatively studied the stability of whiteness of poplar APMP puree and reduction treatment under different solvent mediums (organic type and aqueous solution) and additives. The results showed that after the treatment of the mixture of Tinuvin 1130 and fatty alcohol, the anti-light induced back-color effect of the pulp was particularly remarkable. The method is very close to the industrial application conditions and has potential industrial application value.