关键词: 二氧化氯, 竹浆粕, 白度, 黏度, α-纤维素, 聚戊糖

Abstract: The importance and necessarity of chlorine dioxide bleaching during production of bamboo dissolving pulp were discussed in present study. Effects of ClO₂ dosage, NaOH dosage, bleaching temperature and time in D₁ stage, and ClO₂ dosage in D₂ stage on pulp properties, including α-cellulose content, pentosan content, brightness, Kappa number, pulp viscosity and ash content, were examined respectively. The relationships between pulp brightness and α-cellulose, pentosan, ash contents in D₁ stage were established. The results showed that the optimal bleaching for preparing bamboo dissolving pulp with chlorine dioxide(D₁) were conducted as the pulp was treated by 1.52% of ClO₂ and 0.76% of NaOH at 75℃ for 120 minutes. The pulp brightness was increased by 78.8%, and only a 19.55% of pulp viscosity was observed after D₁ stage. The ClO₂ dosage in D₂ stage was 0.8%. And the other conditions were as follows: 0.4% NaOH, 75℃ and 120 min, 10% of pulp quality mark. The α-cellulose content increased with the rise of pulp brightness, meanwhile, accompanying with the decline of pentosan and ash content. This is positive for the quality modification of the obtained bamboo dissolving pulp. After the bleaching by two stages of chlorine dioxide, the brightness of the final bamboo dissolving pulp reached up to 88.2% (ISO).

Key words: chlorine dioxide, bamboo dissolving pulp, brightness, viscosity, α-cellulose, pentosan