Preparation method of silver-loaded nano cellulose-chitosan composite film

A technology of nano-cellulose and chitosan, which is applied in the field of preparation of silver-loaded nano-cellulose-chitosan composite film, can solve the problems of nano-silver easy to agglomerate, achieve difficult agglomeration, improve antibacterial performance, and make the preparation process green Effect

Inactive Publication Date: 2017-06-13
QIQIHAR UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention provides a preparation method of silver-loaded nanocellulose-chitosan composite film, which uses nanocellulose to load nanosilver to solve the problem that nanosilver is easy to agglomerate; utilizes the excellent mechanical properties of nanocellulose The strength improves the shortcoming of chitosan film being brittle and fragile, and at the same time improves the antibacterial performance of chitosan film by loading nano-silver

Method used

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  • Preparation method of silver-loaded nano cellulose-chitosan composite film
  • Preparation method of silver-loaded nano cellulose-chitosan composite film
  • Preparation method of silver-loaded nano cellulose-chitosan composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] S1, preparation of nanocellulose

[0032] Add 1g of microcrystalline cellulose and 100ml of distilled water into the ultrasonic cell breaking cup for ultrasonic treatment. The ultrasonic power is 1500W, and the ultrasonic time is 0.5h. After standing still, the upper layer suspension is concentrated by rotary evaporation and freeze-dried to obtain powdered nanocellulose. (NCC);

[0033] S2, preparation of dialdehyde-based nanocellulose

[0034] Take 1g of the above-mentioned nanocellulose powder, dissolve it in 100ml distilled water to form a 1% (m / v) NCC suspension, add 1g of sodium periodate, stir magnetically under dark conditions, then undergo high-speed centrifugation, ultrasonic dispersion, and finally let it stand Take the upper suspension, concentrate it by rotary evaporation, and freeze-dry to obtain powdered nanocellulose (DNCC) with a dialdehyde-based structure;

[0035] S3, preparation of silver-loaded nanocellulose

[0036] Take 0.1 g of the above-mentio...

Embodiment 2

[0040] S1, preparation of nanocellulose

[0041] Add 1g of microcrystalline cellulose and 100ml of distilled water into the ultrasonic cell breaking cup for ultrasonic treatment. The ultrasonic power is 1500W, and the ultrasonic time is 0.5h. After standing still, the upper layer suspension is concentrated by rotary evaporation and freeze-dried to obtain powdered nanocellulose. (NCC);

[0042] S2, preparation of dialdehyde-based nanocellulose

[0043]Take 1g of the above-mentioned nanocellulose powder, dissolve it in 100ml distilled water to form a 1% (m / v) NCC suspension, add 1g of sodium periodate, stir magnetically under dark conditions, then undergo high-speed centrifugation, ultrasonic dispersion, and finally let it stand Take the upper suspension, concentrate it by rotary evaporation, and freeze-dry to obtain powdered nanocellulose (DNCC) with a dialdehyde-based structure;

[0044] S3, preparation of silver-loaded nanocellulose

[0045] Take 0.1 g of the above-mention...

Embodiment 3

[0049] S1, preparation of nanocellulose

[0050] Add 1g of microcrystalline cellulose and 100ml of distilled water into the ultrasonic cell breaking cup for ultrasonic treatment. The ultrasonic power is 1500W, and the ultrasonic time is 0.5h. After standing still, the upper layer suspension is concentrated by rotary evaporation and freeze-dried to obtain powdered nanocellulose. (NCC);

[0051] S2, preparation of dialdehyde-based nanocellulose

[0052] Take 1g of the above-mentioned nanocellulose powder, dissolve it in 100ml distilled water to form a 1% (m / v) NCC suspension, add 1g of sodium periodate, stir magnetically under dark conditions, then undergo high-speed centrifugation, ultrasonic dispersion, and finally let it stand Take the upper suspension, concentrate it by rotary evaporation, and freeze-dry to obtain powdered nanocellulose (DNCC) with a dialdehyde-based structure;

[0053] S3, preparation of silver-loaded nanocellulose

[0054] Take 0.1 g of the above-mentio...

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Abstract

The invention discloses a preparation method of a silver-loaded nano cellulose-chitosan composite film, the preparation method of the silver-loaded nano cellulose-chitosan composite film comprises the following steps: adding sodium periodate into a nano cellulose solution, stirring in a dark place, centrifuging for separation, and washing to obtain dialdehydo nano cellulose; adding a newly-prepared saturated silver ammonia solution for preparation of silver-loaded nano cellulose; mixing the silver-loaded nano cellulose with a chitosan solution to obtain a silver-loaded nano cellulose-chitosan antibacterial film. Nano silver particles prepared in the method are evenly distributed in dialdehydo nano cellulose network structures, the easy agglomeration problem of the nano silver particles can be well solved, the preparation process does not require the use of special instruments, also does not need a chemical reducing agent, and the production cost is reduced. Through use of good mechanical properties of the nano cellulose, the low mechanical strength problem of the chitosan film is improved, and the antibacterial property of the chitosan film is improved by silver loading operation. The silver-loaded nano cellulose-chitosan composite film has broad application prospects in antibacterial wound dressings and food packaging and other industries.

Description

technical field [0001] The invention relates to the field of preparation of antibacterial materials, in particular to a preparation method of a silver-loaded nano-cellulose-chitosan composite film. Background technique [0002] Nanosilver (Ag) has the advantages of strong bactericidal ability, high activity, and strong permeability, and is widely used in the fields of biomaterial antibacterial, medical material antibacterial, and food packaging. The antibacterial efficiency of Ag is determined by the size of the silver particles, that is, the smaller the radius of the nano-Ag particles, the higher the antibacterial efficiency, but the smaller the radius of the nanoparticles, the greater the surface energy, and the easier it is to agglomerate in the solution medium, which limits the antibacterial efficiency of the nano-Ag particles. Bacteriostatic efficiency. Loading nano-Ag on a carrier with a large specific surface area and stable chemical properties can not only solve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08L1/04C08K3/08C08K5/053C08J5/18C08B15/02
CPCC08B15/02C08J5/18C08J2305/08C08J2401/04C08K2201/011C08L5/08C08L2203/16C08L1/04C08K2003/0806C08K5/053
Inventor 董峰李淑君路荷雨李雪青王小林刘忠明
Owner QIQIHAR UNIVERSITY
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