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Layer-by-layer self-assembled composite antibacterial film and preparation method thereof

A layer-by-layer self-assembly, composite antibacterial technology, applied in coatings, biocide-containing paints, antifouling/underwater coatings, etc., can solve the problems of strong network chain gaps and unsatisfactory mechanical properties, and achieve improved Mechanical properties, good bacteriostatic effect, excellent bacteriostatic effect

Active Publication Date: 2022-04-08
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties are still unsatisfactory due to the intramolecular and intermolecular hydrogen bonds on the glycoside chains of chitosan and the strong network chain gap between chitosan molecules.

Method used

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  • Layer-by-layer self-assembled composite antibacterial film and preparation method thereof
  • Layer-by-layer self-assembled composite antibacterial film and preparation method thereof
  • Layer-by-layer self-assembled composite antibacterial film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 A kind of preparation of layer by layer self-assembled composite antibacterial film 1

[0027] 1. the preparation method of chitosan-cellulose nanofiber base layer in the composite antibacterial film of self-assembly layer by layer, comprising steps:

[0028] S1, preparation of chitosan solution: weigh 3g of chitosan in a beaker, add 200mL of glacial acetic acid solution with a mass fraction of 1%, place it on a magnetic stirrer and stir for 6 hours at room temperature to obtain a chitosan solution;

[0029] S2, preparation of chitosan-cellulose nanofiber crosslinking solution: add 0.09g cellulose nanofiber and 0.007g genipin to the chitosan solution and stir for 30min, wherein genipin is the crosslinking agent to obtain the shell Polysaccharide-cellulose nanofiber crosslinking solution;

[0030] S3. Preparation of the chitosan-cellulose nanofiber base layer: place the chitosan-cellulose nanofiber crosslinking solution in an ultrasonic cleaner for 1 hour t...

Embodiment 2

[0035] Embodiment 2 A kind of preparation of layer by layer self-assembled composite antibacterial film 2

[0036] 1. the preparation method of chitosan-cellulose nanofiber base layer in the composite antibacterial film of self-assembly layer by layer, comprising steps:

[0037] S1, preparation of chitosan solution: weigh 10 g of chitosan in a beaker, add 500 mL of glacial acetic acid solution with a mass fraction of 1.5%, place on a magnetic stirrer and stir at room temperature for 15 hours to obtain a chitosan solution;

[0038] S2, preparation of chitosan-cellulose nanofiber crosslinking solution: add 0.02g cellulose nanofiber and 0.01g genipin to the chitosan solution and stir for 10min, wherein genipin is the crosslinking agent to obtain the shell Polysaccharide-cellulose nanofiber crosslinking solution;

[0039] S3. Preparation of chitosan-cellulose nanofiber base layer: put the chitosan-cellulose nanofiber cross-linking solution in an ultrasonic cleaner for 0.5h to rem...

Embodiment 3

[0044] Embodiment 3 A kind of preparation of layer by layer self-assembled composite antibacterial film 3

[0045] 1. the preparation method of chitosan-cellulose nanofiber base layer in the composite antibacterial film of self-assembly layer by layer, comprising steps:

[0046] S1, preparation of chitosan solution: weigh 20g of chitosan in a beaker, add 1000mL of glacial acetic acid solution with a mass fraction of 2%, place on a magnetic stirrer and stir for 8 hours at room temperature to obtain a chitosan solution;

[0047] S2, preparation of chitosan-cellulose nanofiber crosslinking solution: add 0.45g cellulose nanofiber and 0.015g genipin to the chitosan solution and stir for 60min, wherein genipin is the crosslinking agent to obtain the shell Polysaccharide-cellulose nanofiber crosslinking solution;

[0048] S3. Preparation of the chitosan-cellulose nanofiber base layer: place the chitosan-cellulose nanofiber crosslinking solution in an ultrasonic cleaner for 3 hours t...

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Abstract

The invention discloses a layer-by-layer self-assembled composite antibacterial film and a preparation method thereof. Cellulose nanocrystals are grafted with hexadecyl trimethyl ammonium chloride, and a comb-shaped polymer quaternized cellulose nanocrystal layer capable of loading hydrophobic antibacterial active substances is prepared; meanwhile, cellulose nanofibers and chitosan are cross-linked to construct a base layer with good mechanical properties and barrier properties; and compounding the two layers of materials through a layer-by-layer self-assembly method to form the composite antibacterial film. The film prepared in the invention has excellent mechanical properties and barrier properties, and can load hydrophobic antibacterial substances with good bacteriostatic activity on escherichia coli, salmonella typhimurium, staphylococcus aureus and listeria monocytogenes; the method can be applied to various antibacterial fields such as the food field, the biological field, the medical field, the sewage treatment field and the functional textile field.

Description

technical field [0001] The invention belongs to the technical field of antibacterial materials, and in particular relates to a layer-by-layer self-assembled composite antibacterial film and a preparation method thereof. Background technique [0002] Consumers have a demand for a healthy and safe lifestyle, therefore, the development trend in the food industry is to keep products as fresh as possible while avoiding the use of synthetic preservatives. Therefore, active packaging with high antibacterial activity and food preservation properties has attracted the attention of researchers. Many hydrophobic antibacterial substances have significant antioxidant and antibacterial activities and are considered to be an ideal class of active packaging materials. However, the insolubility and volatility of these antibacterial substances limit their practical applications. [0003] Comb polymers are a class of macromolecules with densely grafted side chains on the polymer backbone. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D101/08C09D5/14C08L5/08C08L1/02C08J3/24C08B15/06
CPCY02A50/30
Inventor 毕景然李仪茜姜景慧侯红漫张公亮郝洪顺
Owner DALIAN POLYTECHNIC UNIVERSITY
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