Development Of Livistona Biomass Fiber

In order to promote the full use of natural resources,Livistona stems were used as new raw material of biomass fiber,in this paper.Then the main chemical constituents of the Livistona Stem were measured,and the technological conditions for the preparation of Livistona cellulose pulp were determined.The technological conditions for the preparation of Livistona Biomass Fiber by NMMO system were discussed.On this basis,Livistona cellulose and HTCC were blended and spun,which obtained a blend fibres with antibacterial effect.?1?By the determination of the chemical constituents of the Livistona stem,found that the contents of cellulose,hemicellulose and lignin were 38.42%,19.93%and 17.72%,respectively.According to the characteristics of the chemical composition of the Livistona Stema,the pulp was prepared by a chemical pulping process using alkali treatment and acid treatment.Through orthogonal test,depend on the content of niobium-cellulose and polymerization loss in cellulose pulp,show that the optimum alkali treatment conditions for the Livistona Stema were in a mixed solution of 5%NaOH and 0.6%H₂O₂,heating for 4 h at 80?.The optimal conditions for the acid treatment were to use a 0.15 mol/L HCl,at 1:10 solid-liquid ratio,heating for 2 h at 80?.?2?Through the Improvement of Wet Spinning Equipment,Livistona cellulose regenerated fiber was prepared by dissolving and spinning with NMMO system.Then the effect of spinning conditions on the mechanical properties of fiber was discussed and the morphology of fiber was observed.The result shows that the mechanical properties of the obtained fiber was better,when draw ratio was 3.4,the length of air gap was 2.2 cm,the temperature of coagulation bath was 16?,stretching bath temperature 40?and the concentration of spinning solution was 9%,the resultant fiber had a linear density of 17.83 dtex,a breaking strength of 2.21 cN/dtex,a elongation at break of 8.71%,and a initial modulus of 74.55 cN/dtex.Mechanical properties close to viscose level.SEM show that the average diameter of fibers is45-60 um,uniform in thickness,smooth and clean in longitudinal direction,the fiber has shallow grooves and inconspicuous fine seams,the cross section is solid round or oval structure.?3?In the same spinning process conditions,blended fibers were prepared by blending Livistona cellulose with different content of HTCC.FT-IR shows that the blended fiber have a weak absorption peak at 1480cm^-1,which proved that there were HTCC in the blended fiber.Compared with the pure Livistona cellulose fiber,the hydroxyl absorption intensity range was slightly reduced in each band.The stretching vibration absorption peak of its hydroxyl group shifted from 3424.00 cm^-1 to 3434.35cm^-1,and the absorption peak of hydroxyl deformation vibration moved from 1375.01cm^-1 to 1373.27 cm^-1.It shows that the addition of HTCC causes the breakage of hydrogen bonds between cellulose molecules;SEM image showed:The cross-section of the blended fiber that compared with pure Livistona cellulose fiber gradually changes from an approximately circular shape to a flat oval shape.Grooves begin to appear in the longitudinal direction,the smoothness was reducing.Mechanical property test and XRD results showed:With the increasing of HTCC content in the blended fiber,the crystallinity first increases and then decreases,which is the same as the change of mechanical properties.Hygroscopicity test results shows:The moisture absorption and moisture regain of the blended fibers were improved,indicating that the moisture absorption of the blended fibers was improved.TG and DTG results showed:With the increase of HTCC content in the blended fibers,the maximum decomposition temperature of the blended fibers showed a downward trend,indicating that the thermal stability of the blended fibers became worse.Antibacterial result displayed:1%blended fibers had low antimicrobial rate on E.coli?42.69%?and S.aureus?47.01%?.However,with the increase in the content of HTCC in blend fibers,the antibacterial effect has increased significantly.The inhibition rate of 5%blended fiber against E.coli and S.aureus reached 89.47%and 91.45%,respectively.The antimicrobial properties of fiber are improved obviously.