Method for preparing cellulose gel film

A cellulose gel, cellulose technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of compact and uniform structure, avoiding rapid and irregular accumulation, and simple preparation method

Inactive Publication Date: 2009-09-23
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the problems of high pollution, low wet strength, cumbersome process and unfavorable mass production in the prior art, the present invention provides a method for preparing cellulose gel film, which can not only solve the problem of cellulose Environmental problems caused by the membrane preparation process, and can improve product performance, reduce production costs, suitable for industrial production

Method used

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  • Method for preparing cellulose gel film
  • Method for preparing cellulose gel film

Examples

Experimental program
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Embodiment 1

[0023] Disperse 5 g of cotton linter cellulose pulp in 100 g of 4.5 wt % NaOH / 9.5 wt % thiourea mixed aqueous solution precooled to -5 °C, and stir for 10 minutes to obtain a transparent cellulose solution. The cellulose solution was centrifuged and defoamed at 8000rpm / min for 10 minutes with an ultracentrifuge, and then poured into a special glass box and sealed. The glass frame containing the cellulose solution was frozen at -20°C for 12 hours for solution gel treatment, and then thawed at 5°C to obtain a cellulose physical gel, and then the obtained cellulose physical gel was taken out of the mold and placed The sodium hydroxide and thiourea in the gel were removed in deionized water, the deionized water was renewed every 5 hours, and the cellulose hydrogel film was obtained after repeated washing for about three times. Its stress-strain curve is shown in figure 2 in a.

Embodiment 2

[0025] Disperse 7g of cotton linter cellulose pulp in 100g of 7.0wt% NaOH / 10.5wt% urea mixed aqueous solution precooled to -10°C, and stir for 10 minutes to obtain a transparent cellulose solution. The solution was centrifuged and defoamed at 8000rpm / min for 10 minutes with an ultracentrifuge, and then poured into a special glass box and sealed. The glass frame containing the cellulose solution was stored at 5°C for three weeks for solution gel treatment to obtain a cellulose physical gel, and then the resulting cellulose physical gel was taken out from the mold and placed in deionized water to remove the cellulose in the gel. Sodium hydroxide, urea, and deionized water are renewed every 5 hours, and the cellulose hydrogel membrane is obtained after repeated washing three times.

Embodiment 3

[0027] Disperse 4g of cotton linter cellulose pulp in 100g of 6.0wt% NaOH / 9.5wt% urea mixed aqueous solution precooled to -5°C, and stir for 10 minutes to obtain a transparent cellulose solution. The cellulose solution was centrifuged and defoamed at 8000rpm / min for 10 minutes with an ultracentrifuge, and then poured into a special glass box and sealed. Store the glass frame containing the cellulose solution at 25°C for one week for solution gel treatment to obtain a cellulose physical gel, then remove the obtained cellulose physical gel from the mold and place it in deionized water to remove the gel Sodium hydroxide and urea, and deionized water are renewed every about 5 hours, and the cellulose hydrogel membrane is obtained after repeated washing three times.

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Abstract

The invention discloses a preparation method of a cellulose hydrogel film, which adopts the following specific steps: (1) dissolving the cellulose in a sodium hydroxide / urea mixed aqueous solution which has been pre-cooled at -15 to -5°C or oxidizing the cellulose Sodium / thiourea mixed aqueous solution is prepared into a cellulose solution with a cellulose content of 0.01wt% to 10wt%; (2) After the cellulose solution is centrifugally defoamed, it is placed in a mold and sealed at -20 to 40°C Carry out solution gelation treatment under the pregel temperature of the temperature to obtain cellulose physical gel; (3) soak cellulose physical gel in deionized water until solvent component sodium hydroxide, thiourea or urea in the gel are removed Finally, the fiber hydrogel film is obtained; (4) the fiber hydrogel film is placed in a swelling agent to remove water to obtain a high-strength cellulose gel film. The preparation method of the cellulose gel film provided by the invention not only solves the environmental problems brought about in the preparation process of the cellulose film, but also can improve product performance, reduce production cost, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of a cellulose gel film, which belongs to the field of natural polymers, and also belongs to the fields of chemistry, sanitation, agriculture, environmental engineering and material engineering. Background technique [0002] Because biofilm materials have broad application prospects in the fields of bioseparation, tissue engineering and food processing, they have received widespread attention. The regenerated cellulose membrane and its derivatives have become one of the most widely used membrane materials due to their good chemical stability, renewability and biocompatibility, playing a huge role in dialysis, ultrafiltration, reverse osmosis and other fields. role. Regenerated cellulose film is mainly prepared by viscose method and organic solvent regeneration method, but this has caused serious environmental pollution and hindered the sustainable development of human society. At present, a series of new ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/10
Inventor 梁松苗张俐娜徐坚吴俊杰
Owner WUHAN UNIV
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