紫外吸收剂和游离基捕获剂对杨木APMP纸浆白度稳定效果的研究

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的。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、离基捕获呈抗氧剂等处理纸浆罅纸张返色的研究已有报道。本文研究了杨森ＡＰＭＰ纸浆手抄片添加紫外吸收类化合物、游离基捕获剂和抗氧剂等的工艺条件效果。结果Ｔｉｎｕｖｉｎ１１３０与脂肪醇混合物处理还原，纸浆抗光诱导返色效果尤为显著，该技术方

BRIGHTNESS STABILIZING EFFECT OF UV-ABSORBERS AND RADICAL TRAPPER ON POPLAR APMP PULPS

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.