Preparation method of bamboo holocellulose nanofiber with high length-diameter ratio and high hemicellulose content
A technology of hemicellulose and nanofibers, applied in the direction of cellulose/protein conjugated artificial filaments, nanotechnology, fiber chemical characteristics, etc. low, can not fully meet the needs of use, etc., to achieve the effect of environmental friendliness, short time and easy operation
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[0032] Example 1
[0033] Preparation method of bamboo cellulose nanofibers of high long diameter ratio high tanks, steps are as follows:
[0034] (1) Preparation of low-molten solvent (DES): zinc acetate (ZA) as a hydrogen bond donor, choline choline (CHCl) as hydrogen bond receptor, uniform mixing with receptor molar ratio 1: 2 The mixture was stirred at 80 ° C for 4 h by magnetic force until a uniform transparent liquid appeared.
[0035] (2) Preprocessing: 0.5 g of bamboo cellulose powder and 25 ml of zinc chloride (ZAC) to the TEFLON container of the microwave reactor. The solid solution of the cellulose powder and the DES of the bamboo tape is 1:50 (g / ml), and acetic acid, the molar ratio of acetic acid and DES is 1: 1 (ZAC1-1), or 1: 2 (ZAC2-1) , Or 1: 3 (zac3-1). The mixture is mixed using a glass rod. The mixture was treated at 120 ° C, the microwave irradiation power was 600 W for 10 minutes. After preprocessing, the mixture was cooled to room temperature, and the powd...
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[0037] Example 2
[0038] Preparation method of bamboo cellulose nanofibers of high long diameter ratio high tanks, steps are as follows:
[0039] (1) Preparation of low-molten solvent (DES): zinc acetate (ZA) as a hydrogen bond donor, choline choline (CHCl) as hydrogen bond receptor, uniform mixing with receptor molar ratio 1: 2 The mixture was stirred at 80 ° C for 4 h by magnetic force until a uniform transparent liquid appeared.
[0040] (2) Preprocessing: 0.5 g of bamboo cellulose powder and 25 ml of zinc chloride (ZAC) to the TEFLON container of the microwave reactor. The solid-liquid ratio of the bamboo cellulose powder and DES is 1: 50 (g / ml), and acetic acid, the molar ratio of acetic acid and DES is 1: 1 (ZAC1-2), or 1: 2 (ZAC2-2) , Or 1: 3 (ZAC3-2). The mixture is mixed using a glass rod. The mixture was taken at 140 ° C and the microwave irradiation power was taken at 600 W. After preprocessing, the mixture was cooled to room temperature, and the powder residue was f...
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[0042] Example 3
[0043] The results obtained by the preparation of Examples 1, 2 were named ZAC1-1, ZAC2-1, (ZAC3-1, ZAC1-2, ZAC2-2, ZAC3-2, ZAC3-2, were characterized, and the results were shown in Table 1 Shows. The specific method is as follows:
[0044] 1) The calculation formula of the recovery rate is: recovery = HcNF mass (G) / bamboo cellulose powder mass (g) * 100%.
[0045] 2) AFM observation: Dilute the nano-stricken cellulose suspension 0.5%, dried on a smooth cloud master, after natural air dried, using an atomic force microscope to observe nanofiber morphology, obtain average length (nm), average width (nm) and long Ratio.
[0046] 3) Determination of crystallinity: The instrument used is an X-ray diffraction instrument, crystallinity (%) = crystalline zone peak area / (crystalline zone peak area + amorphous zone peak area) * 100%.
[0047] 4) Determination of glucan and xylan content: Using US energy laboratory special wood fiber component assay, after hydrolysis ...
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