构皮浆弱碱性过氧化氢漂白工艺研究

Study on Alkalescent Hydrogen Peroxide Bleaching Process of Broussonetia Papyrifera Bark Pulp

关键词:  构皮浆  H₂O₂漂白  Na₂CO₃  响应面  书画纸

Key Words:Broussonetia papyrifera bark pulp  H₂O₂ bleaching  Na₂CO₃  response surface  calligraphy and painting paper

摘要:本研究以实验室自制构皮浆为原料，使用Na₂CO₃-H₂O₂工艺进行漂白实验，分别探究了H₂O₂用量、反应时间、反应温度对构皮浆漂白效果的影响。为了提高最优工艺参数的精准度，对Na₂CO₃-H₂O₂工艺进行响应面法优化。结果表明，在H₂O₂用量2.9%、反应时间87 min、反应温度82 ℃的条件下，构皮浆白度达76.6%，聚合度从未漂浆的2 704下降至1 886。与现有书画纸用构皮浆的次氯酸盐工艺及NaOH-H₂O₂工艺相比，Na₂CO₃-H₂O₂工艺对纤维损伤更小，漂白效率更高。以Na₂CO₃-H₂O₂工艺制备的构皮浆具有白度稳定、物理强度高、耐老化性能更好、所抄纸张润墨性能良好等优点。

Abstract:In this study， Na₂CO₃-H₂O₂ process was taken with lab-made Broussonetia papyrifera bark pulp as raw material， the effects of H₂O₂ dosage， reaction time， and reaction temperature on the bleaching effect of Broussonetia papyrifera bark pulp were investigated， respectively. In order to improve the precision of the optimum process parameters， Na₂CO₃-H₂O₂ process was optimized by response surface method. The results showed that the whiteness of the Broussonetia papyrifera bark pulp reached 76.6%， and the polymerization degree decreased from 2 704 of unbleached pulp to 1 886， with the H₂O₂ dosage of 2.9%， reaction time for 87 min， and reaction temperature at 82 ℃. Comparing to hypochlorite process and NaOH-H₂O₂ process of Broussonetia papyrifera bark pulp， Na₂CO₃-H₂O₂ process had less fiber damage and higher bleaching efficiency. The Broussonetia papyrifera bark pulp prepared by Na₂CO₃-H₂O₂ process had some advantages， such as stable whiteness， high physical strength， and better aging resistance， and the paper prepared by bleached pulp had better ink moistening performance.