Lyocell纤维纺丝用溶解浆的制备及性能表征

Preparation and Performance Characterization of Spinning Pulp of Lyocell Fiber

关键词:  针叶木浆  溶解浆  Lyocell纤维  纤维素/NMMO溶液  激光扫描共聚焦显微镜（LSCM）

Key Words:softwood pulp  dissolving pulp  Lyocell fiber  cellulose/NMMO solution  laser scanning confocal microscope （LSCM）

摘要:本研究以针叶木浆为原料，通过冷碱抽提、过氧化氢降聚、乙酸酸化等工艺制备可达到Lyocell纤维纺丝用标准的溶解浆。结果表明，采用针叶木浆制备的溶解浆达到Lyocell纤维纺丝用标准；溶解浆中α-纤维素含量达到96.12%，纤维素聚合度降至653，灰分含量0.07%，铁离子含量小于4 mg/kg；溶解浆在N-甲基吗啉-N-氧化物（NMMO）中的溶解性能显著提升。

Abstract:In this paper， in order to meet the standard of spinning pulp of Lyocell fiber， softwood pulp was used as raw material to prepare the dissolving pulp by cold alkali extraction， hydrogen peroxide depolymerization， acetic acid acidification and other processes. The results showed that the dissolving pulp prepared by softwood pulp reached the standard of dissolving pulp for the standard of spinning pulp of Lyocell fiber. The α-cellulose content of obtained pulp reached higher than 96.12%， the degree of polymerization of cellulose dropped to 653， the ash content was 0.07%， the iron ion content was less than 4 mg/kg， and the solubility of prepared pulp in N-methylmorpholine-N-oxide （NMMO） was significantly improved.