摘要
针对目前国产Lyocell纤维用溶解浆质量不高、来源不稳定等问题,以俄罗斯云杉为原料,采用预水解硫酸盐蒸煮工艺制备了高品质Lyocell纤维用溶解浆粕。考察了预水解、硫酸盐蒸煮、二氧化氯、过氧化氢漂白及酸处理等工艺对溶解浆粕关键技术指标(如α-纤维素含量、聚合度、白度、灰分以及金属离子含量)的影响。试验结果显示,保温时间90 min、温度150℃、固液比1∶4为最佳预水解条件,碱用量24%、硫化度30%、保温时间180 min为最佳蒸煮条件。在最佳预水解和蒸煮条件下制备的浆料经过二氧化氯质量分数1.5%漂白、冷碱质量分数12%抽提、过氧化氢质量分数5%漂白和乙酸质量分数6%处理后,所得浆粕的α-纤维素含量为96%,白度为85%,聚合度为647,灰分为0.06%,铁离子含量为6 mg/kg,铜离子含量为3 mg/kg。偏光显微镜观察显示,该浆料在90℃的N-甲基吗啉-N-氧化物(含水率为13.3%)中30 s即可完全溶解。
In order to solve the problem of low quality and unstable source of dissolving pulp for domestic lyocell fiber,Russian spruce was used as raw material and high-quality dissolving pulp was prepared for lyocell fiber by pre-hydrolyzed sulfate cooking process.The effects of pre-hydrolysis,sulfate cooking,chlorine dioxide-hydrogen peroxide bleaching and acid treatment on the key technical indexes of dissolved pulp,such asα-cellulose content,polymerization,whiteness,ash content and metal ion content,were investigated.The experimental results show that the holding time of 90 min,the temperature of 150℃and the solid-liquid ratio of 1∶4 were the optimal prehydrolysis conditions,and the alkali content of 24%,the degree of vulcanization of 30%and the holding time of 180 min were the optimal cooking conditions.The slurry prepared under the optimal prehydrolysis and cooking conditions was treated with 1.5%chlorine dioxide bleaching,12%cold alkali extraction,5%hydrogen peroxide bleaching and 6%acetic acid,and the resulting pulp had aα-cellulose content,a whiteness of 85%,a polymerization degree of 647,an ash content of 0.06%,an iron ion content of 6 mg/kg,and a copper ion content of 3 mg/kg.Polarizing microscopy showed that the slurry could be completely dissolved in NMMO(moisture content of 13.3%)at 90℃for 30 s.
作者
张兴
李军荣
钱丽颖
何北海
徐纪刚
ZHANG Xing;LI Junrong;QIAN Liying;HE Beihai;XU Jigang(School of Light Industry Science and Engineering,South China University of Technology,Guangzhou,Guandong 510640,China;State Key Laboratory of Bio-sourced Fiber Manufacturing Technology,China Textile Academy,Beijing 100025,China)
出处
《毛纺科技》
CAS
北大核心
2024年第9期34-43,共10页
Wool Textile Journal
基金
生物源纤维制造技术国家重点实验室开放课题(SKL202206)。
