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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）。 |
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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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