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Method for preparing nano-silver powder through enzyme decomposition technology

A technology of nano-silver powder and enzymatic decomposition, applied in the nano field, can solve the problems of many hidden dangers, poor conductivity and stability of nano-silver paste, high toxicity, etc., and achieve no pollution to the environment, simple and easy preparation process, and uniform particle size. Effect

Active Publication Date: 2017-09-22
青岛纳印新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method requires the use of a large amount of acetone, which has many potential safety hazards and high toxicity; the conductivity and stability of the nano-silver paste obtained by the second method are worse than those of the first method, and there are many defects in the usability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Preparation of gelatin solution: add 20g of gelatin to 980g of water, heat at 40°C until the gelatin dissolves to obtain a 2% gelatin solution, cool and set aside.

[0017] 2. Preparation of nano-silver dispersion: Weigh 7g of silver nitrate and dissolve it in 10g of water to obtain solution A; weigh 4g of hydrazine hydrate and dissolve it in 8g of water to obtain solution B; at room temperature, add solutions A and B to the In 100 g of 2% gelatin solution, react at room temperature for 3 hours to obtain a nano-silver dispersion with a particle size of about 300 nm.

[0018] 3. Enzyme decomposition: measure the pH value of the prepared nano-silver dispersion with a pH agent, the measured pH value is 3.5, adjust the pH value to 3 with 1% dilute hydrochloric acid solution, add 0.035 g acid protease, protease The concentration is 0.03%; stir at 40°C for 3 h, remove the supernatant by filtration, wash the silver powder with water, and dry it in vacuum at 60°C to obtain n...

Embodiment 2

[0020] 1. Prepare a 2% gelatin solution: add 20 g of gelatin to 980 g of water, heat at 40°C until the gelatin dissolves to obtain a gelatin solution, cool and set aside.

[0021] 2. Preparation of nano-silver dispersion: Weigh 7g of silver nitrate and dissolve it in 10g of water to obtain solution A; weigh 4g of hydrazine hydrate and dissolve it in 8g of water to obtain solution B; at room temperature, add solutions A and B to the In 100 g of 2% gelatin solution, react at room temperature for 3 hours to obtain a nano-silver dispersion with a particle size of about 300 nm.

[0022] 3. Enzyme decomposition: the pH value of the nano-silver dispersion prepared above is 3.5, adjust the pH value to 5 with 1% sodium hydroxide solution, add 0.035g papain to the solution, and the protease concentration is 0.03%; stir at 40°C After 3 hours, the supernatant was removed by filtration, the silver powder was washed with water, and vacuum-dried at 60° C. to obtain nano-silver powder.

Embodiment 3

[0024] 1. Prepare a 4% gelatin solution: add 40g of gelatin to 960g of water, heat at 40°C until the gelatin dissolves to obtain a gelatin solution, cool and set aside.

[0025] 2. Preparation of nano-silver dispersion: Weigh 7g of silver nitrate and dissolve it in 10g of water to obtain solution A; weigh 4g of hydrazine hydrate and dissolve it in 8g of water to obtain solution B; at room temperature, add solutions A and B to the In 100 g of 4% gelatin solution, react at room temperature for 3 hours to obtain a nano-silver dispersion with a particle size of about 210 nm.

[0026] 3. Enzyme decomposition: the pH value of the nano-silver dispersion prepared above is 3.8, adjust the pH value to 7 with 1% sodium hydroxide solution, add 0.093g papain to the solution, the protease concentration is 0.08%, and stir at 50°C After 3 hours, the supernatant was removed by filtration, the silver powder was washed with water, and vacuum-dried at 60° C. to obtain nano-silver powder.

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Abstract

A method for preparing nano-silver powder through the enzyme decomposition technology comprises the steps that firstly, a gelatin aqueous solution with a certain concentration is prepared; secondly, a nano-silver dispersion liquid is prepared, wherein a silver nitrate solution with a certain concentration and a reducing agent are added into the gelatin aqueous solution at the same time and stirred for a certain period of time at normal temperature, and the nano-silver dispersion liquid is obtained; thirdly, the enzyme decomposition process is conducted, wherein if the reducing agents used in the second step are different, the pH values of the obtained nano-silver dispersion liquids are different; a certain amount of protease is added, and a reaction is conducted for a certain period of time at a certain temperature; nano-silver deposits, then the nano-silver is filtered, washed and dried, and the nano-silver powder is obtained. The method has the advantages that the specificity and effectiveness of enzyme are utilized, so that a protective agent of the nano-silver is decomposed to obtain the nano-silver, the pH value and the temperature in the process are constant, the reaction process can be effectively controlled, and the appearance and particle size of the synthesized nano-silver powder are uniform; the preparation process is simple and feasible, the period is short, no pollution is caused to the environment, operation is controllerable, and the method can be suitable for batch production; the prepared nano-silver powder is good in conductivity, uniform in particle size, good in dispersibility, high in purity and the like, and is an ideal material of electronic paste.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a method for preparing nano-silver powder by enzymatic decomposition technology. Background technique [0002] At present, there are two main methods for industrially preparing nano-conductive silver paste: first, prepare nano-silver dispersion liquid under the condition of adding protective agent, then coagulate with acetone, and re-disperse nano-silver paste; Prepare nano-silver powder in the environment, and then disperse the nano-silver powder in solvents, resins, and additives by grinding and other methods. The first method needs to use a large amount of acetone, which has many potential safety hazards and high toxicity; the conductivity and stability of the nano-silver paste obtained by the second method are worse than those of the first method, and there are many defects in use performance. Contents of the invention [0003] The technical problem to be solved by the presen...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 朱磊王默胡旭伟常鹏飞马浩
Owner 青岛纳印新材料科技有限公司
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