Method for preparing nano-silver from nanocellulose hydrogel

A nano-cellulose and hydrogel technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of shortening the storage time and difficulty in controlling the size of nano-silver, and achieve easy control of preparation conditions, easy promotion and application, and polymerization degree Good results

Inactive Publication Date: 2016-06-15
CHANGZHOU DAAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: it is difficult to control the size of nano-silver in the traditional preparation, and at a higher concentration, it is impossible to avoid the agglomeration, growth or agglomeration of nano-silver particles, thereby shortening the storage time. The method for preparing nano-silver from nano-cellulose hydrogel, the present invention first uses nano-bamboo fiber to prepare nano-hydrogel, soaks the hydrogel in silver salt solution, utilizes the internal network structure of the hydrogel and contains abundant groups , to absorb silver ions, soak the hydrogel after absorbing silver ions in a reducing agent to generate nano-silver, then separate and remove impurities, and spray-dry to obtain nano-silver powder. The nano-silver particles prepared by the present invention have uniform size, high purity, The dispersion is good, and the degree of polymerization of the prepared hydrogel is good, so the nano-silver powder with small size can be obtained, and the preparation conditions are easy to control, the cost is low, no need to add surfactants, and the pollution to the environment is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First, take 50g of nano-bamboo fiber, add it to 100mL of 30% hydrochloric acid solution by mass fraction, stir and mix it in a water bath at 70°C until the mixture forms a translucent jelly, and bubble it with nitrogen gas for 30 minutes to remove it from the system. After bubbling, cool to room temperature, then add 2mL of tetramethylethylenediamine and 0.3g of potassium persulfate, transfer to an ice bath, stir and mix at 0°C for 30min; slowly drop into the above mixed solution Add 80mL of 30% acetamide solution by mass fraction, control the dropwise addition within 25min, stir and react for 60min after dripping, transfer to a glass container after reaction, seal it, and place it in a constant temperature box at 10°C to continue polymerization for 24h, and the polymerization is completed After forming a hydrogel, filter the hydrogel out and rinse it with distilled water for 3 times, put it in an oven after rinsing, dry it at 50°C for 6 hours, and pulverize it to obtain...

example 2

[0021] First, take 65g of nano-bamboo fiber, add it to 125mL of 30% hydrochloric acid solution by mass fraction, stir and mix it in a water bath at 75°C until the mixture forms a translucent jelly, and bubble nitrogen into it for 35min to remove the dissolved in the system After bubbling, cool to room temperature, then add 2.5mL tetramethylethylenediamine and 0.4g potassium persulfate, transfer to an ice bath, stir and mix at 0°C for 40min; Add dropwise 90mL of acetamide solution with a mass fraction of 30%, and control the dropwise addition to be completed within 25min. After the dripping is completed, stir and react for 70min. After the hydrogel is formed, the hydrogel is filtered and rinsed with distilled water for 4 times. After rinsing, it is placed in an oven, dried at 55°C for 7 hours, and then crushed to obtain a 70-mesh powder to obtain a nanocellulose hydrogel powder; Measure 225mL of deionized water, add 17g of silver nitrate to it, stir and mix in a light-proof env...

example 3

[0024]First, take 80g of nano-bamboo fiber, add it to 150mL of 30% hydrochloric acid solution by mass fraction, stir and mix it in a water bath at 80°C until the mixture forms a translucent jelly, and bubble it with nitrogen for 40 minutes to remove it from the system. After bubbling, cool to room temperature, then add 3mL tetramethylethylenediamine and 0.5g potassium persulfate, transfer to ice bath, stir and mix at 0°C for 50min; slowly drop into the above mixed solution Add 100mL of acetamide solution with a mass fraction of 30%, control the dropwise addition within 25min, stir and react for 80min after dripping, transfer to a glass container after reaction, seal it, and place it in a constant temperature box at 10°C to continue polymerization for 24h, and the polymerization is complete After forming a hydrogel, filter the hydrogel out and rinse it with distilled water for 5 times, put it in an oven after rinsing, and dry it at 60°C for 8 hours. After drying, it is crushed t...

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Abstract

The invention discloses a method for preparing nano-silver from nanocellulose hydrogel, and belongs to the field of nano-silver preparation. The method comprises the steps that nano-hydrogel is prepared from nano-bamboo fiber, the hydrogel is soaked in a silver salt solution, silver ions are adsorbed through the internal network structure of the hydrogel and rich groups contained in the hydrogel, the hydrogel adsorbing the silver ions is put into a reducing agent to be soaked to generate nano-silver, and then impurity removing through separation and spray drying are performed to obtain nano-silver powder. The nano-silver prepared through the method is uniform in particle size, high in purity and good in dispersity, the prepared hydrogel is good in polymerization degree, and therefore the nano-silver powder of the small size can be obtained; in addition, the preparation conditions are easy to control, the cost is low, no surfactant needs to be added, and pollution to the environment is reduced.

Description

technical field [0001] The invention discloses a method for preparing nano silver by using nano cellulose hydrogel, which belongs to the field of nano silver preparation. Background technique [0002] With the gradual development of electronic equipment in the direction of small size, light weight, low cost, multiple functions, and high reliability, it is of great practical significance to develop and produce nano-silver powder and nano-silver paste. [0003] The chemical reduction method is a common method for preparing nano-silver powder. After the reaction, nano-metals are mixed with solvents, unreacted raw materials, surfactants, and reaction by-products. How to separate nano-metals from impurities is also a difficult problem. The commonly used separation method is centrifugation, but nanoparticles are very easy to agglomerate, grow up or agglomerate under the action of strong centrifugal force, and the separated silver nanoparticles are also very easy to harden when dri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/054
Inventor 潘艳丽王统军
Owner CHANGZHOU DAAO NEW MATERIAL TECH CO LTD
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