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Preparation method of multipurpose water-resistant multidimensional crosslinked composite membrane

A water-resistant and multi-purpose technology, applied in the field of preparation of multi-purpose water-resistant multi-dimensional cross-linked composite membranes, can solve the problems of increased rigidity of chitosan membranes, low chemical cross-linking, insufficient water resistance, etc., and achieve enhanced interaction strength , weaken the degree of swelling, reduce the effect of swelling

Inactive Publication Date: 2019-12-03
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has obvious disadvantages, that is, as the degree of crosslinking increases, the rigidity of the chitosan film increases, the toughness decreases, and even becomes brittle and easily broken.
Therefore, the use of chitosan in combination with a small amount of other materials and lower chemical crosslinking can improve the mechanical properties of chitosan films, but there are still disadvantages of insufficient water resistance.

Method used

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  • Preparation method of multipurpose water-resistant multidimensional crosslinked composite membrane
  • Preparation method of multipurpose water-resistant multidimensional crosslinked composite membrane
  • Preparation method of multipurpose water-resistant multidimensional crosslinked composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Preparation of mixed solution A:

[0030] Accurately weigh 1.5g of chitosan and add it to 100mL acetic acid solution (concentration 0.5%, v / v), stir until the chitosan is completely dissolved, then add 1g of glycerin and 0.5g of nano-silicon dioxide and stir evenly, filter to remove incompatible substances, stand-by.

[0031] 2) Preparation of mixed solution B:

[0032] Accurately weigh disodium hydrogen phosphate and dissolve it in distilled water to prepare a metal salt solution with a concentration of 0.15 mol / L. Then, the metal salt solution was added dropwise into the mixed solution A under the condition of stirring, so that the final pH of the solution was 6.5, and it was ready for use.

[0033] 3) Preparation of mixed solution C:

[0034] Accurately weigh 2 g of polyvinyl alcohol and dissolve it in 100 mL of distilled water, take 20 mL of polyvinyl alcohol solution and add it to 80 mL of mixed solution B, stir evenly, eliminate air bubbles and set aside.

...

Embodiment 2

[0037] 1) Preparation of mixed solution A:

[0038] Accurately weigh 1.6g of chitosan and add it to 100mL acetic acid solution (concentration 1%, v / v), stir until the chitosan is completely dissolved, then add 1.1g of glycerin and 0.4g of nano-titanium dioxide and stir evenly, filter to remove incompatible substances, and wait use.

[0039] 2) Preparation of mixed solution B:

[0040] Accurately weigh dipotassium hydrogen phosphate and dissolve it in distilled water to prepare a metal salt solution with a concentration of 0.15 mol / L. Then, the metal salt solution was added dropwise into the mixed solution A under the condition of stirring, so that the final pH of the solution was 6.25, and it was ready for use.

[0041] 3) Preparation of mixed solution C:

[0042] Accurately weigh 3 g of konjac glucomannan and dissolve it in 100 mL of distilled water, take 25 mL of konjac glucomannan solution and add it to 75 mL of mixed solution B, stir evenly, eliminate air bubbles and se...

Embodiment 3

[0045] 1) Preparation of mixed solution A:

[0046] Accurately weigh 2g of chitosan and add it to 100mL acetic acid solution (concentration 1%, v / v), stir until the chitosan is completely dissolved, then add 1.2g of glycerin and 0.6g of nano-graphene and stir evenly, filter to remove the insoluble matter, wait use.

[0047] 2) Preparation of mixed solution B:

[0048]Accurately weigh disodium β-glycerophosphate and dissolve in distilled water to prepare a solution with a concentration of 0.2 mol / L. Then, the disodium β-glycerophosphate solution was added dropwise to the mixed solution A under stirring condition, so that the final pH of the solution was 6.0, and it was ready for use.

[0049] 3) Preparation of mixed solution C:

[0050] Accurately weigh 3.5g of carboxymethyl cellulose and dissolve in 100mL of distilled water, take 30mL of konjac glucomannan solution and add it to 70mL of mixed solution B, stir well and eliminate air bubbles for later use.

[0051] Take a ce...

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Abstract

The invention relates to the technical field of composite membrane preparation, in particular to a preparation method of a multipurpose water-resistant multidimensional crosslinked composite membrane.Metal salts such as disodium hydrogen phosphate and dipotassium hydrogen phosphate are added into a prepared chitosan solution, the influence of part of acetic acid ions on chitosan can be effectively eliminated, anions in the metal salts can form ion cross-linking with amino of the chitosan, and the strength of interaction between chitosan molecular chains is improved. After a prepared chitosanmembrane is in contact with water, due to the action of the metal salts, amino protonation of the chitosan is weakened, thus the swelling degree of the chitosan membrane is significantly decreased, and the good mechanical properties of the chitosan membrane are still kept in an aqueous solution.

Description

technical field [0001] The invention relates to the technical field of composite membrane preparation, in particular to a method for preparing a multi-purpose water-resistant multi-dimensional cross-linked composite membrane. Background technique [0002] Chitosan is a water-insoluble polysaccharide extracted from discarded crustaceans such as shrimps and crabs. The molecular chain of chitosan contains a large number of amino groups, and it has good biodegradability and biocompatibility. Chitosan is an excellent film-forming material, which is widely used in food packaging, water pollution treatment, electrochemical electrode preparation and wound dressing. However, the chitosan film without any modification treatment has strong hydrophilicity and swelling property, and with the increase of swelling degree, its mechanical strength will be greatly reduced, become fragile and brittle, and lose toughness, which This greatly limits the practical application of chitosan membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08L29/04C08L5/00C08L1/28C08K5/053C08K3/36C08K3/22C08K3/04C08J5/18
CPCC08J5/18C08J2305/08C08J2401/28C08J2405/00C08J2429/04C08K3/36C08K5/053C08K2003/2241C08K2201/011C08K3/042
Inventor 马美湖刘远远郑昊楠李述刚
Owner HUAZHONG AGRI UNIV
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