Silver-loaded nano cellulose, preparation method thereof and antibacterial composite material

A technology of nanocellulose and composite materials, applied in the field of silver-loaded nanocellulose and its preparation, and antibacterial composite materials, can solve the problems of high surface energy, easy agglomeration and high cost

Active Publication Date: 2020-07-31
INNER MONGOLIA AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, the speed that this method generates silver nanoparticle is faster, and nanoparticle has higher surface energy, is easy to agglomerate, needs to adopt the process of control reaction such as polyvinylpyrrolidone (PVP) by dispersant or stabilizer, and this makes this method The cost of the method is high, and it pollutes the environment, so it needs to be improved urgently

Method used

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  • Silver-loaded nano cellulose, preparation method thereof and antibacterial composite material
  • Silver-loaded nano cellulose, preparation method thereof and antibacterial composite material
  • Silver-loaded nano cellulose, preparation method thereof and antibacterial composite material

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preparation example Construction

[0029] The invention provides a kind of preparation method of silver-loaded nano cellulose, comprising the following steps:

[0030] lignonanocellulose, tetramethylpiperidine oxide, NaBr and Na 2 CO 3 -NaHCO 3 The buffer solution is mixed to obtain a lignonanocellulose suspension;

[0031] The lignonanocellulose suspension is mixed with NaClO aqueous solution and then oxidized to obtain carboxylated lignonanocellulose;

[0032] The carboxylated lignonanocellulose, AgNO 3 , NaBH 4 It is mixed with water, and the reduction reaction is carried out under the condition of avoiding light, so as to obtain the silver-loaded nano-cellulose.

[0033] In the present invention, lignonanocellulose, tetramethylpiperidine oxide, NaBr and Na 2 CO 3 -NaHCO 3 The buffer solution is mixed to obtain a lignonanocellulose suspension. The present invention has no special limitation on the source of the lignonanocellulose, which can be prepared by commercially available products or well-know...

Embodiment 1

[0052] (1) preparing silver-loaded nanocellulose, comprising the following steps:

[0053] Na 2 CO 3 and NaHCO 3 Dissolve in water to give Na 2 CO 3 -NaHCO 3 buffer solution, wherein, the Na 2 CO 3 and NaHCO 3 The mass ratio is 7:3, Na 2 CO 3 and NaHCO 3 The total concentration of 0.1mol / L;

[0054] Weigh 0.5g of tetramethylpiperidine oxide and 1g of NaBr, dissolve the two in 250mL of the buffer solution, and then add 2.5g of lignonanocellulose to obtain a lignonanocellulose suspension;

[0055] Under stirring conditions, the pH value of 4 mL of NaClO aqueous solution (concentration: 0.4 mmol / g) was adjusted to 10 with hydrochloric acid (concentration: 28 wt%), and then the resulting solution was added dropwise to the wood at a rate of 2 drops / second. In the nanocellulose suspension, react at 25°C for 4 hours under stirring conditions; then add 2.5mL ethanol to the obtained system to terminate the reaction, filter, wash the filter cake with deionized water until ne...

Embodiment 2

[0061] Prepare Ag-NC / PVA composite film according to the method of embodiment 1, the difference is that, AgNO 3 The addition amount of is 0.051g, then the volume fraction of silver nanoparticles in the silver-loaded nanocellulose dispersion obtained after the reduction reaction is 3%, and the final gained Ag-NC / PVA composite film is recorded as Ag-NC-3 / PVA film.

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Abstract

The invention provides a silver-loaded nano cellulose, a preparation method thereof and an antibacterial composite material, and belongs to the technical field of functional materials. The preparationmethod comprises the following steps: mixing nano lignocellulose, tetramethyl piperidine oxide, NaBr and a Na2CO3-NaHCO3 buffer solution to obtain a nano lignocellulose suspension; mixing the nano lignocellulose suspension with a NaClO water solution, carrying out an oxidation reaction to obtain carboxylated nano lignocellulose; and mixing carboxylated nano lignocellulose, AgNO3, NaBH4 and water,and carrying out a reduction reaction under a dark condition to obtain the silver-loaded nano cellulose. By adopting the provided method, silver nano particles can be uniformly dispersed on the surface of the nano cellulose, the problem that silver nano particles are easy to agglomerate is solved; the silver-loaded nano cellulose is doped into a base material, and thus the obtained antibacterialcomposite material has an excellent antibacterial performance and also has excellent water resistance and mechanical properties.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a silver-loaded nano-cellulose, a preparation method thereof, and an antibacterial composite material. Background technique [0002] In recent years, with the continuous development of nanotechnology in the field of materials, many new nanomaterials have emerged one after another. Nano-silver is an advanced functional material, which has the general properties of nano-materials, such as small size effect, surface effect and macroscopic quantum tunneling effect, etc. It has very important application value in optoelectronics, biosensing, catalysis and other fields. At the same time, nano-silver has a strong inhibitory and killing effect on dozens of microorganisms such as Escherichia coli, Neisseria gonorrhoeae, and Chlamydia trachomatis, so it is widely used in textile packaging, medical equipment and other fields. [0003] At present, there are many methods for pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08K3/08C08H8/00A01N59/16A01P1/00A01N25/10
CPCC08K3/08C08H8/00A01N59/16A01N25/10C08K2201/011C08K2003/0806C08L97/02
Inventor 黄金田孙光明汪昭奇王宇赵胜利红岭焦德凤
Owner INNER MONGOLIA AGRICULTURAL UNIVERSITY
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