Method for preparing cellulose gel film

A cellulose gel and cellulose technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of convenient molding, avoiding rapid random accumulation, compact and uniform structure

Inactive Publication Date: 2008-04-23
WUHAN UNIV
View PDF0 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 fi

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing cellulose gel film

Examples

Experimental program
Comparison scheme
Effect test

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 2a.

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention discloses a preparation method of cellulose hydrogel membrane. Said preparation method includes the following steps: (1), dissolving the cellulose in sodium hydroxide and urea mixed solution or sodium hydroxide and sulfourea mixed solution with-15deg.C- -5deg.C to make precooling treatment to obtain cellulose solution whose cellulose content is 0.01wt%-10wt%; (2), making the cellulose solution undergo the process of centrifugal defoaming treatment, then placing the cellutose solution in a mould and sealing, under the condition of that its pregelatification temperature is -20-40deg.C making pregelatification treatment of solution so as to obtain cellulose physical gel; (3), making the cellulose physical gel be soaked in deionized water until the solvent component sodium hydroxide, sulfourea or urea are removed from said gel to obtain cellulose gel membrane; and (4), placing the cellulose gel membrane into a swelling agent and removing water content so as to obtain the invented high-strength cellulose gel membrane.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01D71/10
Inventor 梁松苗张俐娜徐坚吴俊杰
Owner WUHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap