楮皮纸复配分散剂体系构建及对纸张性能的影响

Construction of Dispersant System for Kozo Paper Compounding and Its Effect on Paper Properties

关键词:  楮皮纸  分散剂  纸张性能

Key Words:Kozo paper  dispersant  paper properties

摘要:本研究分析了不同种类的合成/改性高分子材料（聚环氧乙烯、阴离子型聚丙烯酰胺、羟丙基瓜尔胶、黄蜀葵胶）及其复配分散剂体系的黏度、相对分子质量分布，探讨了上述各分散剂对楮皮纤维的分散效果（滤水性能、纸张匀度）及纸张性能（物理性能、润墨性能）的影响。结果表明，聚环氧乙烯∶羟丙基瓜尔胶∶黄蜀葵胶以1∶1∶1质量比复配的D₁分散剂效果最优。该分散剂放置48 h后黏度仍保持为387 mPa·s，相对分子质量分布变化不明显，因此仍能保持良好的纸浆分散性能；未打浆处理的楮皮纤维中D₁添加量为12%时，纸张的匀度指数为137，纸张的抗张指数相比未添加分散剂的纸张提高4.8%、撕裂指数提高6.2%、耐折度从51次增加到287次，纸张中墨迹圆形度为0.72，灰度值偏差为14.4，墨迹内部墨色均匀。

Abstract:This study involved the analysis of the viscosity and molecular weight distribution of various synthetic/modified polymer materials， including polyethylene oxide， anionic polyacrylamide， hydroxypropyl guar gum， Abelmoschus manihot gum， and a compounded dispersant system. The investigation focused on the impact of these dispersants on the dispersion of Kozo fibres， as measured by drainage performance and paper sheet uniformity， as well as on the papermaking performance， including physical properties and ink absorption. The results showed that the D₁ dispersant， a compounded mixture of polyethylene oxide， hydroxypropyl guar gum， and Abelmoschus manihot gum at a 1∶1∶1 mass ratio， exhibited the most effective results. After 48 h of placement， the viscosity of this dispersant remained at 387 mPa·s， and there was no significant change in molecular weight distribution， indicating that it maintained good pulp dispersion performance. When the addition amont of D₁ added in untreated Kozo fibres was 12%， the uniformity index of the papers reached 137， the tensile index increased by 4.8%， compared to the sample without dispersant A₁， the tear index increased by 6.2%， and the folding endurance increased from 51 to 287 times. The roundness of the ink in the paper was 0.72， the gray value deviation was 14.4， and the ink color inside the ink was uniform.