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Method for preparing bacterial cellulose/polyvinyl alcohol composite membrane by wet process

A technology of bacterial cellulose and polyvinyl alcohol, which is applied in the field of wet preparation of bacterial cellulose/polyvinyl alcohol composite membranes, can solve the problems of high requirements and high cost, and achieve the effects of low cost, good elasticity and good application prospects

Inactive Publication Date: 2011-01-19
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the freeze-thaw cycle method and the freeze-vacuum drying method have higher requirements for instruments and higher costs. Therefore, exploring a new film-forming method for a composite film of bacterial cellulose and water-soluble polymer additives will further improve the performance of the composite film. It is very necessary and urgent to improve the ideal film-forming method with lower preparation cost
However, in the current research on bacterial cellulose and water-soluble polymer composite membranes, there is no report on the preparation of composite membranes by chemical cross-linking wet method using supersaturated salt solution as a coagulation bath and related methods.

Method used

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  • Method for preparing bacterial cellulose/polyvinyl alcohol composite membrane by wet process
  • Method for preparing bacterial cellulose/polyvinyl alcohol composite membrane by wet process
  • Method for preparing bacterial cellulose/polyvinyl alcohol composite membrane by wet process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Place the bacterial cellulose in a container filled with water, crush it with an emulsifier, the treatment conditions are 7000-28000 rpm, 5-60min, and obtain the bacterial cellulose homogenate;

[0026] (2) Determination of the water content of the bacterial cellulose homogenate is: 98% (V / V);

[0027] (3) Distilled polyethylene with distilled water Configured as an aqueous solution with a mass concentration of 10%;

[0028] (4) Based on the moisture content of the bacterial cellulose homogenate as 98%, uniformly mix the bacterial cellulose homogenate with a 10% polyvinyl alcohol aqueous solution in a mass ratio of 1:10;

[0029] (5) Spread the mixture evenly in the mold of the glassware, and make the thickness 0.500-2.500mm. After defoaming, place it at room temperature for 12 hours, and then add it to 100ml of supersaturated K 2 SO 4 In the solution, use 2ml of 37wt% formaldehyde solution to cross-link for 30 minutes at a pH of 1.5 and a temperature of 80° C. ...

Embodiment 2

[0032] (1) Place the bacterial cellulose in a container filled with water, crush it with an emulsifier, the treatment conditions are 7000-28000 rpm, 5-60min, and obtain the bacterial cellulose homogenate;

[0033] (2) Determination of the water content of the bacterial cellulose homogenate is: 98% (V / V);

[0034] (3) Polyvinyl alcohol is configured into an aqueous solution with a mass concentration of 15% with distilled water;

[0035] (4) Taking the water content of the bacterial cellulose homogenate as 98%, uniformly mixing the bacterial cellulose homogenate with a polyvinyl alcohol aqueous solution with a concentration of 15% in a mass ratio of 1:8;

[0036] (5) Spread the mixture evenly in a plexiglass mould, and make the thickness 0.500-2.500mm. After defoaming, place it at room temperature for 15 hours, and then add it to 100ml of supersaturated (NH 4 ) 2 SO 4 In the solution, 2.5ml of 40wt% acetaldehyde solution was used to crosslink for 20 minutes at a pH of 1.5 and...

Embodiment 3

[0039] (1) Place the bacterial cellulose in a container filled with water, crush it with an emulsifier, the treatment conditions are 7000-28000 rpm, 5-60min, and obtain the bacterial cellulose homogenate;

[0040] (2) measure the moisture content of bacterial cellulose homogenate: 98% (V / V);

[0041] (3) Polyvinyl alcohol is configured into an aqueous solution with a mass concentration of 5% with distilled water;

[0042] (4) On the basis of the moisture content of the bacterial cellulose homogenate being 98%, the bacterial cellulose homogenate is uniformly mixed with a polyvinyl alcohol solution having a concentration of 5% in a mass ratio of 1:6;

[0043] (5) Spread the mixture evenly in the ceramic mold, and make the thickness 0.500~2.500mm, defoam and place it at room temperature for 18h, and then add it to 100ml of supersaturated Na 2 SO 4 3ml of 30wt% glyoxal solution was used in the solution to cross-link for 20 minutes at a pH of 2.5 and a temperature of 80° C. to ob...

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Abstract

The invention relates to a method for preparing a bacterial cellulose / polyvinyl alcohol composite membrane by a wet process, which comprises the following steps: mechanically crushing bacterial celluloses to obtain a bacterial cellulose homogenate, and then determining the water content; preparing polyvinyl alcohol into a solution with a mass concentration of 5-15%; and uniformly mixing the bacterial cellulose homogenate and the polyvinyl alcohol solution, spreading in a mold, deaerating, standing at room temperature for 12-36 hours, and crosslinking with an aldehyde solution in a supersaturated salt solution to obtain the bacterial cellulose / polyvinyl alcohol composite membrane. By preparing the bacterial cellulose and water-soluble high molecular composite membrane by chemical crosslink in a coagulation bath, the preparation method has the characteristics of simple film-forming process, low cost, environmental friendliness and the like, and has favorable application prospects in industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of bacterial cellulose composite membranes, in particular to a method for wet preparation of bacterial cellulose / polyvinyl alcohol composite membranes. Background technique [0002] Bacterial cellulose was first discovered by Brown, and its diameter is only 1 / 10 of that of artificial synthetic fibers, ranging from 10nm to 100nm. It is a new type of nanoscale biological material. The main difference between bacterial cellulose and plant cellulose is that it is not doped with other polysaccharides, such as hemicellulose, while plant cellulose contains hemicellulose and lignin, so bacterial cellulose has many unique properties, such as high chemical Purity and high crystallinity, high tensile strength and elastic modulus, and strong water binding, excellent shape retention and tear resistance, at the same time, bacterial cellulose is also a biodegradable, and in human Nano-biological fibers that do not de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L1/02C08K5/07C08J5/18C08J3/24
Inventor 陆大年杨亮
Owner DONGHUA UNIV
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