A kind of preparation method of cellulose film with catalytic activity
A cellulose film, catalytic activity technology, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of complicated separation steps of catalysts and products, unreusable catalysts, and high cost of adaptable production. Good thermal stability and catalytic performance, avoiding cumbersome separation steps and abundant raw materials
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Embodiment 1
[0020] In the first step, 5g of cotton linters are dispersed in 100g of alkaline solution, and the obtained cellulose suspension is frozen in a refrigerator at -20°C, taken out after 24 hours, and viscous cellulose solution is obtained after high-speed mechanical crushing, and then Centrifuge the cellulose solution on a centrifuge to remove air bubbles. The conditions are that the temperature of the centrifuge is constant at 5° C., the rotation speed is 8000 r / min, and centrifugation is performed for 10 minutes. The cellulose solution obtained by this simple method is pushed into a thin layer on a glass plate, and then immersed in a concentrated sulfuric acid solution to solidify and regenerate to obtain a transparent cellulose film, which is washed repeatedly with deionized water before use.
[0021] In the second step, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (1.75) is dissolved in a mixed solution of absolute ethanol / water (40ml) with a volume ratio of 4:1, drop Add d...
Embodiment 2
[0023] In the first step, the nanocellulose suspension obtained by acid hydrolysis was diluted to 0.5 wt%, and treated with 300 W ultrasonic power for 10 minutes in an ice bath to ensure that the nanocellulose was uniformly dispersed in water. Then filter the above-mentioned diluted solution with a glass membrane-changing filter device covered with an organic filter membrane, and vacuum filter with a vacuum pump. After the nanocellulose is uniformly formed into a nanocellulose membrane, take it out together with the organic filter membrane, cover with an organic filter membrane, dry at room temperature for 2 to 3 days, and then move to a vacuum oven at 60°C to dry for 2 to 3 days. sky. After drying, it is uncovered to obtain a transparent nanocellulose film.
[0024] In the second step, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (1.51g) was dissolved in a mixed solution of acetone / water (40ml) with a volume ratio of 4:1, and added dropwise Dilute the acetic acid solution...
Embodiment 3
[0026] In the first step, 6g of cotton linters are dispersed in 100g of alkaline solution, and the resulting cellulose suspension is frozen in a refrigerator at -20°C, taken out after 24 hours, crushed by high-speed machinery to obtain a viscous cellulose solution, and then Centrifuge the cellulose solution on a centrifuge to remove air bubbles. The conditions are that the temperature of the centrifuge is constant at 5° C., the rotation speed is 8000 r / min, and centrifugation is performed for 10 minutes. The cellulose solution obtained by this simple method is pushed into a thin layer on a glass plate, and then immersed in a 5 wt% concentrated sulfuric acid solution to solidify and regenerate to obtain a transparent cellulose film, which is washed repeatedly with deionized water before use.
[0027] In the second step, 3-aminopropyltrimethoxysilane (1.25g) is dissolved in a mixed solution of absolute ethanol / water (40ml) with a volume ratio of 4:1, and dilute acetic acid soluti...
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