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Preparation method of bacterial cellulose-nano silver composite material

A technology of bacterial cellulose and composite materials, applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of operation cost, safety and toxicity, etc., and achieve reduced agglomeration, uniform distribution, and small particle size Effect

Active Publication Date: 2011-10-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these works all use sodium borohydride, hydrazine hydrate, aldehydes, etc. as reducing agents. If they are industrialized, they will face problems of operating costs, safety and toxicity.

Method used

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  • Preparation method of bacterial cellulose-nano silver composite material

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preparation example Construction

[0013] In conjunction with accompanying drawing, the preparation method of bacterial cellulose-nano-silver composite material of the present invention may further comprise the steps:

[0014] In the first step, the bacterial cellulose wet film is crushed and then added to an alkaline solution to boil. The alkaline solution is a mixture of one or more of sodium hydroxide, sodium carbonate, potassium hydroxide, and potassium carbonate solutions, and the concentration of the alkaline solution is 0.5 -2.0%, then neutralize with acetic acid solution, the concentration of acetic acid solution is 1.0-2.0%. Then wash with deionized water until neutral;

[0015] In the second step, the product obtained in the first step is immersed in a silver salt solution, the silver salt is silver nitrate or silver 2-ethylhexanoate, the concentration of the silver salt solution is 0.0012-0.6mol / L, and then filtered or centrifuged to obtain solid, then washed with deionized water;

[0016] In the t...

Embodiment 1

[0022] Implementation example 1: the preparation method of bacterial cellulose-nanometer silver composite material of the present invention may further comprise the steps:

[0023] The first step is to crush 5g bacterial cellulose wet film, add 0.5% NaOH solution, boil for 1-2 hours, then treat with 1.0% acetic acid solution for 20-30 minutes, and then wash with deionized water until neutral ;

[0024] In the second step, the product obtained in the first step is placed in 0.6mol / L AgNO 3 Soak in solution (25mL), stir at room temperature for 2-3 hours, filter or centrifuge to obtain a solid, and then wash with deionized water for 3 times;

[0025] In the third step, the product of the second step is transferred to 0.5% polyethylene glycol aqueous solution (50mL), stirred for 1-2 hours and then placed in an ice bath. When the temperature of the reaction system is lower than 5°C, start to drop 0.5mol / L of ascorbic acid solution vitamin C (50mL) the whole reaction process does...

Embodiment 2

[0029] Implementation example 2: the preparation method of bacterial cellulose-nano-silver composite material of the present invention may further comprise the steps:

[0030] In the first step, after pulverizing 5g bacterial cellulose wet film, add 2.0% sodium carbonate solution, boil for 0.5-1 hour, then treat with 2.0% acetic acid solution for 30-50 minutes, and finally wash with deionized water until medium sex;

[0031] In the second step, the product obtained in the first step is placed in 0.0012mol / L AgNO 3 Soak in solution (25mL), stir at room temperature for 2-3 hours, filter or centrifuge to obtain a solid, and then wash with deionized water for 3 times;

[0032] In the third step, the product of the second step is transferred to 0.01% polyethylene glycol aqueous solution (50mL), stirred for 2-3 hours and then placed in an ice bath. When the temperature of the reaction system is lower than 5°C, start to drop 0.1mol / L of ascorbic acid solution (5mL) the whole react...

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Abstract

The invention discloses a preparation method of a bacterial cellulose-nano silver composite material. The composite material is prepared by the following steps: pretreating a bacterial cellulose wet film; impregnating in a silver salt solution; transferring the bacterial cellulose with adsorbed silver ions into a polyethylene glycol solution; dropwisely adding an ascorbic acid solution into the mixed system; and carrying out centrifugal separation, washing, and drying to obtain the bacterial cellulose-nano silver composite material. By using the method for reducing silver ions through ascorbic acid under the protection of polyethylene glycol, the invention takes advantages of the stabilizing effect of the polyethylene glycol, the mild reaction conditions and nontoxicity of the ascorbic acid and the like, thus forming a nano composite system having the characteristics of small particle diameter and uniform distribution. The bacterial cellulose-nano silver composite material can be usedin the fields such as medical antiseptic dressings and the like.

Description

technical field [0001] The invention belongs to the technology of depositing nanoparticles on the surface of nanofibers, in particular to a preparation method of bacterial cellulose-nanometer silver particle composite system. Background technique [0002] Bacterial cellulose (BC) is one of the hot spots in the research of biomaterials at home and abroad. It is a kind of polymer compound produced by some bacteria. It was first discovered by British scientist Brown in 1886. Bacterial cellulose fibers are composed of microfibers with a diameter of 3 to 4 nanometers to form fiber bundles with a thickness of 40 to 60 nanometers, and interweave to form a developed ultra-fine network structure. The elastic modulus of bacterial cellulose is several times that of ordinary plant fibers It has a strong water holding capacity, and has high biocompatibility, adaptability and good biodegradability. In recent years, the development of bacterial cellulose-based organic-inorganic hybrid mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/44
Inventor 汪信孙东平何浩明杨加志
Owner NANJING UNIV OF SCI & TECH
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