聚木糖用于增强纸张物理强度的初步研究

Application of Xylan Hemicellulose in Surface Sizing and Improving Pulp Strength

关键词:  聚木糖  湿部助剂  表面施胶剂  增强

Key Words:hemicellulose  xylan  wet-end additive  surface sizing agent  strengthening

摘要:从三倍体毛白杨中提取了较纯的聚木糖；采用高效液相色谱和凝胶渗透色谱对聚木糖进行了结构分析；研究了聚木糖作为造纸湿部助剂和表面施胶剂时，其用量和分子质量对手抄片物理性能的影响。结果表明，聚木糖用作湿部助剂和表面施胶剂均可明显提高手抄片的物理强度；黏度高即分子质量大的聚木糖对手抄片的增强效果较好；用聚木糖部分替代淀粉对手抄片进行表面施胶效果较好，最佳表面胶中聚木糖和淀粉的用量均为4%，施胶后手抄片的抗张指数、撕裂指数、耐折度和抗水性能比对照样分别提高56.0%、17.1%、10.7倍和39.6%。

Abstract:Relatively pure xylan was extracted from poplar, and treated with acid to prepare the samples with different molecular weights. The xylan was characterized by HPLC and GPC. All of the xylan hemicelluloses samples were used to improve pulp strength as wet-end additive and surface sizing agent. The results showed that xylan can improve the physical properties of handsheets significantly, and the xylan with larger molecular weight has better paper-strengthening effects. It also showed that the surface sizing results are better by using xylan to replace starch partly. The best formula of surface sizing agent is 4% xylan+4% starch, and the tensile index, tear index, folding endurance and water-resistant performance of sized handsheets increase by 56.0%, 17.1%, 10.7 times and 39.6%, respectively, compared to those of the control.