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Method for preparing network-like macroporous structure cellolose adsorption and transfer membrane

A cellulose and transfer film technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of unsatisfactory strength and low strength of cellulose film, and achieve the effect of saving energy consumption, stable performance and reducing production costs

Inactive Publication Date: 2010-12-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low strength of the cellulose film, Beer and others in Germany in the 1990s dissolved the cellulose in a mixture of methyl acetate, ethanol and isobutanol solvent and non-solvent, and added a certain amount of non-solvent water to prepare A certain concentration of film-forming solution was prepared, and then the film-forming solution was coated on the polyester film, and evaporated naturally at room temperature to cause phase separation of the film-forming solution, and a cellulose-polyester composite microparticle with a pore size of 0.45-10.00 μm was prepared. Porous membrane, thus enhancing the strength of the membrane, used in chemical analysis and medical diagnostic experiments, but its strength is still not ideal

Method used

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  • Method for preparing network-like macroporous structure cellolose adsorption and transfer membrane
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  • Method for preparing network-like macroporous structure cellolose adsorption and transfer membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 10 grams of cellulose are dissolved in acetone: ethanol: n-butanol = 5: 3: 2 in the mixed solution of 100 grams of solvents and additives, add 5 grams of deionized water to the solution, stir and dissolve at room temperature, let stand to remove After soaking, scrape it on a clean and flat glass plate with a scraper, and the thickness of the film liquid is about 400-600 μm. Adjust the temperature of the film-making room at 35°C and the relative humidity at 50%, and under these conditions, the solvent is naturally volatilized until it solidifies and forms a film. Then the nascent membrane was rinsed with distilled water for more than 20 hours at room temperature, and the solvent was completely exchanged. Dry the membrane after rinsing at room temperature to obtain a microporous membrane with a certain pore size distribution. The structure of the membrane is as follows: figure 2 ,3 shown.

[0032] Cut out a circular membrane with a diameter of 7cm and put it into an ul...

Embodiment 2

[0036] Keep the types of solvent and non-solvent unchanged, and change the amount of non-solvent added. Dissolve 10 grams of cellulose in acetone: ethanol: n-butanol = 5: 3: 2 in the mixed solution of 100 grams of solvent and additives, add 7 grams of water to the solution, stir and dissolve at room temperature, and let it stand for defoaming Scrape on a clean and flat glass plate with a scraper, and the film thickness is about 400-600 μm. Adjust the temperature of the film-making room at 20°C and the relative humidity at 80%. The following steps are the same as Example 1. The results obtained are shown in Table 2 and attached Figure 4 , 5 .

[0037] Various performances of the prepared membrane of table 2 example 2

[0038]

Embodiment 3

[0040] 7 grams of cellulose are dissolved in dimethylformamide: glycerol: isobutanol=3: 4: 3 in the mixed solution of 100 grams of solvents and additives, add 8 grams of water in the solution, stirring and dissolving at room temperature, static After defoaming, scrape it on a clean and flat glass plate with a scraper. The thickness of the film is about 400-600gm. Adjust the temperature of the film-making room at 35°C and the relative humidity at 80%. The following steps are the same as Example 1. The results obtained are shown in Table 3 and attached Figure 6 , 7 .

[0041] Various performances of the prepared membrane of table 3 example 3

[0042]

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Abstract

The invention discloses a manufacture method for a net state macroporous structure cellulose adsorption transfer printing film that includes the following steps: dissolving the cellulose into organic solvent, adding additive and non-solvent water, whisking under room temperature, laying and debubbling to gain cellulose film making liquid; shaving the liquid on to the glass plate to make the film liquid thickness 400-600um; taking natural volatilizing solvent in sealing environment until solidifying to film; dipping into deionized water and exchanging the solvent and airing. The invention could make stable performance, large diameter, high protein adsorption quantity cellulose platform porous film that could be used in the fields like biochemistry, food, fermenting medicine, detection, andso on.

Description

technical field [0001] The invention relates to a preparation method of a cellulose microporous membrane applied to protein transfer and immunoassay, in particular to a preparation method of a network macroporous structure cellulose adsorption and transfer membrane. Background technique [0002] The main chain of cellulose is composed of anhydroglucose linked by β-1,4-glycosidic bonds, such as figure 1 shown. Due to the linear structure of cellulose, although it is hydrophilic, it is insoluble in water, soluble in relatively cheap organic solvents, such as acetone and acetate, and slightly soluble in alcohols. At the same time, the presence of hydroxyl groups on cellulose makes it have a certain charge. As a membrane material for separation, cellulose has the characteristics of wide sources, good film-forming performance, and low price, but it has poor heat resistance and is prone to chemical and biological degradation. To avoid degradation, the pH should be between 4 and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/544G01N33/531
Inventor 陈欢林孙海翔刘圣南张林
Owner ZHEJIANG UNIV