Process for producing granules
A technology of particles and cellulose fibers, applied in the application field of a method, can solve the problems of low nanofiber content, flocculation, industrial practicality limitation, etc., and achieve the effect of simplifying production and eliminating viscosity increase
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Embodiment 1
[0057] Example 1-TEMPO oxidation of fibers
[0058] Disperse the undried, beaten wood pulp (dry weight 10g) in 750mL H 2 O in. 2,2,6,6-Tetramethylpiperidine 1-oxygen (TEMPO) (0.125g) and sodium bromide (1.25g) were dissolved in 50mL of deionized water, and then added to the cellulose fiber In suspension. The pH of a 10 wt% sodium hypochlorite (NaOCl) solution (50 mmol) was adjusted to pH 10 with 1M hydrochloric acid (HCl). TEMPO-mediated oxidation was started by adding NaOCl solution to the slurry, and the reaction was allowed to proceed at RT and pH 10, and pH was adjusted by adding sodium hydroxide (NaOH) solution (0.5M). When it is not necessary to use NaOH to adjust the pH, the reaction is quenched with 15 mL of ethanol, and then neutralized with HCl-solution to pH ~ 7-8. Thereafter, the fibers are thoroughly washed by filtration.
Embodiment 2
[0059] Example 2-Carboxymethylation of Fiber
[0060] The solvent exchange between undried, beaten wood pulp (10 g dry weight) and ethanol was accomplished by repeated washing and filtration in 100 mL ethanol. Soak the solvent-exchanged fiber in a chloroacetic acid / isopropanol (1g / 50mL) solution for 30 minutes. The fiber was transferred to a solution of hot sodium hydroxide (NaOH) (1.6 g), methanol (50 mL), and isopropanol (200 mL). The reaction was allowed to proceed for 60 minutes before dispersing the fibers in deionized water, acetic acid solution (0.1M), and deionized water and filtering to wash the fibers. Finally, the carboxymethylated fiber was soaked in sodium bicarbonate solution (4wt%) for 60 minutes, and then thoroughly washed with deionized water.
Embodiment 3
[0061] Example 3-Enzymatic pretreatment of fiber
[0062] Disperse the refined softwood pulp (100g) without drying in a phosphate buffer (250mL, made by KH 2 PO 4 And Na 2 HPO 4 The solution is prepared so that the pH is 7 ± 0.2). Add dextranase (1.7μL) and incubate at 50°C for 2h. During this time, manually mix the samples every 30 minutes. The wood pulp was washed with deionized water, and then the glucanase was denatured at 80°C for 30 minutes. Before refining the fibers in a refiner, the fibers are washed again with deionized water to obtain pretreated fibers.
[0063] a. Sample preparation
[0064] Mix starch, glycerol, and water in various ratios between 10:6:6 and 10:1:1, especially 10:3:3, to prepare a crushing environment. The various concentrations of stearic acid included in the mixture range from 0-15%. Various oxidation methods are used to oxidize cellulose-containing fibers in an aqueous solution, and the percentage of oxidized fibers added to the crushing environme...
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Abstract
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