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Preparation and Properties of Mulberry Dissolving Pulp for Lyocell Fiber
Received:April 14, 2024  
DOI：10.11980/j.issn.0254-508X.2024.06.006
Key Words:mulberry branches  Lyocell dissolving pulp  pre-hydrolyzed sulfate pulping  chlorine dioxide bleaching  rheological properties
Fund Project:生物源纤维制造技术国家重点实验室开放课题（SKL202206）。
Author NameAffiliationPostcode
ZHANG Xing School of Light Industry Science and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LI Junrong* School of Light Industry Science and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
QIAN Liying School of Light Industry Science and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
HE Beihai School of Light Industry Science and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
XU Jigang* State Key Lab of Bio-derived Fiber Manufacturing Technology， China Textile Research Institute Co.， Ltd.， Beijing，100025 100025
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Abstract:In order to explore the feasibility of preparing Lyocell grade dissolving pulp from renewable mulberry branch resource， mulberry branch dissolving pulp for Lyocell fiber was prepared by pre-hydrolyzed sulfate cooking， bleaching and acid treatment processes using mulberry branches as raw materials. The effects of pre-hydrolyzed sulfate cooking， chlorine dioxide-cold alkali extraction-chlorine dioxide bleaching and acid treatment on the key technical indexes of dissolved pulp （such as α-cellulose content， degree of polymerization， whiteness， ash content and metal ion content）， the effects of different bleaching sequences on the whiteness of pulp polymerization， the solvent absorption rate of pulp and the rheological properties of spinning stock solution were analyzed. The results showed that the dissolving pulp prepared by mulberry branches reached the standard of Lyocell fiber spinning， and the α-cellulose content of the pulp was 92.8%， the whiteness was 85%， the degree of polymerization was 655， the ash content was 0.09%， the iron ion content was 4 mg/kg， and the copper ion content was 3 mg/kg， and it had good solubility under the condition of NMMO solution with mass fraction of 50% and 0.05 MPa vacuum at 90 ℃. It was completely dissolved in about 35 min.
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