| Summary: | 碩士 === 逢甲大學 === 化學工程學系 === 106 === In this study, ionic liquids prepared in the laboratory that was used to recovery cellulose from biomass waste and waste fabrics. The ability of ionic liquids to dissolve cellulose at different temperatures and the properties of regenerated cellulose at different temperatures were researched in this study. As well as the processing of biomass waste into valorization products of wood-plastic composite materials.
1-allyl-3-methylimidazolium chloride [Amim]Cl is chosen as the solvent for recovering cellulose, the experimental results showed that it has a strong solubility of cellulose and it is easy to synthesize and recover. The source of biomass were sugar cane and rice husk, the waste fabrics were pure cotton and blended fabrics in ionic liquid for cellulose dissolution and regeneration. From the results of this experiment, it can be deduced that cellulose dissolves in ionic liquids at higher temperatures, and the color of precipitated cellulose was deeper. Therefore, cellulose precipitated at a temperature of 90°C reacts for 1.5 hr had the best performance and regenerated cellulose that was confirmed through SEM and TGA analysis results. In this study, the recovery rate of cellulose in sugarcane was 87.16%, and the cellulose recovery in rice husk was 91.34%. In addition, the use of ionic liquids for the dissolution selectively of cellulose to separates cellulose and polyester from blends fabrics. The recovery rate of cellulose in the blends fabrics was 67.67%, and the recovery rate of cellulose in pure cotton was 91.59%. The result of the ionic liquid recovery test in this study was that the cellulose recovery rate was still 96.29% after 5 cycles at 90°C, and the ionic liquid recovery rate was 96.55% and compared by FTIR analysis of the original ionic liquid, wherein the functional groups which are similar.
In wood-plastic composite materials, a 5 wt.% zinc stearate blowing agent has a stable thermal decomposition phenomenon at 150-200°C, making it effective in foam molding in the processing of wood-plastic composite test pieces. The injection-molding machine has the best foaming structure and tensile strength performance of 23.25 MPa at an operating temperature of 190°C, a mold temperature of 70°C, an injection speed of 50 mm/s, and an injection pressure of 50 bar.
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