Preparation method of nano-silver particle supported nanocellulose antibacterial film

A technology of nano-cellulose and nano-silver particles, applied in the field of organic-inorganic composite materials, can solve the problems of easy agglomeration and uneven dispersion of silver particles, and achieve the effects of being beneficial to health, reducing costs, and solving uneven distribution.

Active Publication Date: 2016-06-08
山东银鹰化纤有限公司
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  • Description
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Problems solved by technology

[0007] In view of this, the present invention provides a kind of preparation method of the nano-cellulose antibacterial film of loaded nano-silver particles, solves the problem that the silver particles are dispersed unevenly and easily agglomerated in the nano-cellulose, and de

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  • Preparation method of nano-silver particle supported nanocellulose antibacterial film
  • Preparation method of nano-silver particle supported nanocellulose antibacterial film
  • Preparation method of nano-silver particle supported nanocellulose antibacterial film

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preparation example Construction

[0033] In the preparation method according to the invention, 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO), sodium bromide and sodium hypochlorite are used to treat the cellulose raw material. The possible mechanism of TEMPO oxidation reaction is as attached figure 1 As shown, the TEMPO oxidation system oxidizes the hydroxyl group on the six-position carbon of cellulose to carboxyl group and / or aldehyde group. This reaction oxidizes the hydroxyl group on the surface of the cellulose, reduces the hydrogen bond content, and reduces the binding force between fibers. In addition, the carboxyl group The formation of cellulose improves the water solubility of cellulose, which is beneficial to the nanonization of cellulose.

[0034] The formed carboxyl group can react with sodium hydroxide to obtain -COONa, wherein the sodium hydroxide can be regarded as the product of sodium bromide strong acid and weak base salt dissolved in water. Then, using Na + with Ag + The ion excha...

Embodiment 1

[0042] (1) Pulverize 2g cotton linter pulp board, immerse in 180ml distilled water, add 0.2g sodium bromide, 0.016gTEMPO and 10ml concentration successively and be the sodium hypochlorite solution of 1mol / L, stir 10h at room temperature, stirring speed is 400rpm, reaction During the process, the pH of the reaction system was adjusted to about 10 with a sodium hydroxide solution with a concentration of 1 mol / L every half hour. After the reaction was completed, the oxidized cellulose was obtained by centrifugation, and the carboxyl and aldehyde contents were measured as 0.59mmolg -1 and 0.33 mmolg -1 . Then disperse the prepared oxidized cellulose in water to prepare 200ml of oxidized cellulose aqueous suspension with a mass fraction of 0.5%;

[0043] (2) The oxidized cellulose aqueous suspension obtained above was stirred for 10 minutes at a speed of 15000 rpm, then placed in an ultrasonic cell pulverizer, and treated for 20 minutes at a power of 1000 W to obtain a nanocellul...

Embodiment 2

[0053] (1) Pulverize 2g cotton linter pulp board, immerse in 180ml distilled water, add 0.2g sodium bromide, 0.016gTEMPO and 15ml concentration successively and be the sodium hypochlorite solution of 1mol / L, stir 8h at room temperature, stirring rate is 600rpm, react During the process, the pH of the reaction system was adjusted to about 10 with a sodium hydroxide solution with a concentration of 1 mol / L every half hour. After the reaction was completed, oxidized cellulose was obtained by centrifugation, and the carboxyl and aldehyde content were 0.66 mmolg -1 and 0.23mmolg -1 . Then the prepared oxidized cellulose was dispersed in water to prepare 125ml of oxidized cellulose aqueous suspension with a mass fraction of 0.8%;

[0054] (2) The above-mentioned oxidized cellulose aqueous suspension was stirred for 15 minutes at a speed of 12000 rpm, then placed in an ultrasonic cell pulverizer, and treated for 30 minutes at a power of 800W to obtain a nanocellulose aqueous suspens...

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Abstract

The invention provides a preparation method of a nano-silver particle supported nanocellulose antibacterial film. In the method, a cellulose raw material is treated with 2,2,6,6-tetramethylpiperidine-1-oxygen radical, sodium bromide and sodium hypochlorite and then has a reaction under the condition of a water bath, and nano-silver particle supported nanocellulose is prepared. By means of the method, the problems of non-uniform dispersion and high probability of agglomeration of silver particles in nanocellulose are solved, no special instrument and toxic reagents are used, and the nano-silver particle supported nanocellulose antibacterial film has wide application prospect in antibacterial wound dressing, food storage and fresh keeping and other industrial fields.

Description

technical field [0001] The invention relates to the field of organic-inorganic composite materials, in particular to a method for preparing a nano-cellulose antibacterial film loaded with nano-silver particles. Background technique [0002] Cellulose is the most abundant renewable natural polymer on the earth, and it is widely found in natural plant materials such as wood, bamboo, cotton and hemp. Due to the crisis of resources and environment, the development and utilization of cellulose and its derivatives have attracted extensive attention from scholars at home and abroad. Nanocellulose refers to cellulose products with a diameter between 1 and 100 nm. It has attracted extensive attention because of its good biocompatibility, biodegradability, high strength, high rigidity, excellent optical properties, and light weight. There are a large number of hydroxyl groups on the surface of nanocellulose, which can be combined with other inorganic and organic materials to obtain f...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/04C08K3/08C08B15/02
CPCC08B15/02C08J5/18C08J2301/04C08K3/08C08K2003/0806C08K2201/011C08L2203/16C08L1/04
Inventor 许凤周素坤楚芳冰余鑫萍
Owner 山东银鹰化纤有限公司
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