摘要
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 light induced colour reversion (yellowing) of high yield pulps was mainly due to sensitivity of the specific structure in lignin to UV or near UV light combining with oxygen in the air producing chromophores through forming the intermediate free radicals. Application of UV absorbing compounds and radical trapper or antioxidants onto paper have been reported to stabilise the brightness against light exposure. This paper reports the investigations on application of UV absorbers (Tinuvin 1130 and its ester precusor), nitroxide free radical (a free radical trapper) and polyethlene glycol 300 (an antioxidant) onto poplar APMP handsheets. The effects on non treated and reduced pulps and with organic solvent solution or aqueous solution of additives were compared. The results show that application of Tinuvin 1130 mixed with dodecanol combining with reducing treatment of pulp could provide the handsheets with significant protection from yellowing.This technique was most close to commercial applications.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2000年第1期33-40,共8页
Chemistry and Industry of Forest Products
