PFI/超声分步协同处理对溶解浆在NMMO溶液中溶解性能的影响

Investigation of the Effect of Combined PFI/Ultrasonic Treatment on the Solubility Performance of Dissolving Pulp in NMMO Solution

关键词:  超声  PFI  溶解浆  NMMO  溶解性能

Key Words:ultrasound  PFI  dissolving pulp  N-methylmorpholine-N-oxide  solubility property

摘要:本研究对预水解硫酸盐溶解浆纤维进行了PFI/超声分步协同处理。结果表明，经PFI/超声协同处理后，溶解浆纤维的表面形貌被破坏，大部分初生壁和次生壁S1层被脱除，比表面积、孔容和孔径变大，针叶木溶解浆孔径从未处理的16.76 nm增大到21.85 nm，阔叶木溶解浆从16.74 nm增大到21.61 nm；纤维形貌特征的变化引起了溶解浆纤维保水值和吸液率显著增加，针叶木和阔叶木溶解浆保水值分别增大205.0%和78.5%。同时纤维素结晶度、特性黏度和分子质量降低。PFI/超声协同处理可以有效改善溶解浆在NMMO溶液中的溶解性能。

Abstract:A sequential treatment consisting of initial PFI refining， followed by ultrasonic treatment was performed on pre-hydrolyzed sulfate dissolving pulp fibers in this study. The results showed that after the PFI/ultrasonic synergistic treatment， the surface morphology of dissolving pulp fibers was destroyed， most of the primary wall and S1 layer of the secondary wall were removed， and the specific surface area， pore volume， and pore diameter became larger. Softwood dissolving pulp pore diameter increased from 16.76 nm to 21.85 nm from the untreated treatment and from 16.74 nm to 21.61 nm for hardwood dissolving pulp. The changes in fiber morphology characteristics caused a significant increase in the water retention value and absorbency of dissolving pulp fibers. Softwood and hardwood dissolving pulp water retention values increased by 205.0% and 78.5%， respectively， while the cellulose crystallinity， intrinsic viscosity and molecular weight were reduced. The PFI/ultrasonic synergistic treatment could effectively improve the solubility of dissolving pulp in NMMO solution.