Preparation and Properties of Mulberry Dissolving Pulp for Lyocell Fiber
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 mul-berry 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,white-ness,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 white-ness 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 con-tent 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.
国家科技期刊平台
NSTL
万方数据
