Preparation method for water-redispersible nanocrystalline cellulose
A cellulose, redispersion technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of harsh reaction conditions, limited application scope, etc., achieve environmentally friendly operation, improve water availability. Redispersibility, the effect of broad industrial application prospects
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[0022] A method for preparing water-redispersible cellulose nanocrystals, comprising the following steps:
[0023] 1) Disperse 3-5g of fiber material in 35-40ml of acid solution (the ratio of fiber material to acid solution is 1:8-11g / ml, in this ratio, the unit of fiber material is g, and the unit of acid solution is ml) , the acid solution is hydrochloric acid or sulfuric acid with an acid concentration of less than 0.1%, and the reaction is carried out under heating, pressure and stirring conditions; the reaction temperature is 150-180°C, the reaction time is 50-80min, and the reaction pressure is 5-20MPa; filtration is not hydrolyzed Cellulose obtains filtrate for subsequent use;
[0024] 2) adding the obtained filtrate to the organic solvent under stirring, centrifuging, and collecting the centrifugal precipitate;
[0025] 3) drying the obtained precipitate until obtaining a cellulose nanocrystalline solid with an initial water content of 10%-20% by weight.
[0026] The...
Embodiment 1
[0029] 1) Take 4g of bamboo pulp fibers (1.8mm≤length≤2.5mm, 15μm≤width≤20μm), add 38ml of hydrochloric acid with a mass fraction of 0.08%; the reaction temperature is 150°C, the reaction time is 50min, and the reaction pressure is 20MPa;
[0030] 2) After the reaction is finished, the reaction mixture is filtered through a nylon filter (pore size <1 μm) to separate unhydrolyzed cellulose; the resulting filtrate (containing cellulose nanocrystals and soluble sugar) is added dropwise to tert-butyl In an alcohol solvent, perform solvent replacement to deposit soluble sugar on the surface of cellulose nanocrystals; then centrifuge to precipitate, remove the lower layer of precipitate, and dry at a constant temperature at 60°C until the water-redispersible cellulose nanocrystal solid contains 20% of the initial water content form.
Embodiment 2
[0032] 1) Take 3g of wheat straw pulp fiber (0.8mm≤length≤1.5mm, 10μm≤width≤15μm), add 38ml of hydrochloric acid with a mass fraction of 0.1% and 0.9ml of distilled water; the reaction temperature is 160°C, the reaction time is 70min, and the reaction pressure is 10Mpa ;
[0033] 2) After the reaction is finished, filter the reaction mixture through a nylon filter (pore size <1 μm) to separate unhydrolyzed cellulose; add the obtained filtrate (containing cellulose nanocrystals and soluble sugar) dropwise to ethanol under stirring , to perform solvent replacement to deposit soluble sugars on the surface of cellulose nanocrystals; then centrifuge to precipitate, remove the lower layer of precipitate, and dry at a constant temperature at 60°C to a water-redispersible cellulose nanocrystal solid form with an initial water content of 20%.
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