Preparation of nano aluminum powder for conducting resin and storage method

A technology of nano silver powder and conductive adhesive, applied in the field of preparation and storage of precious metal nano silver powder, can solve the problems of low silver recovery rate, unfavorable scale production, low silver nitrate concentration, etc., achieve high silver recovery rate, improve recovery rate, production simple craftsmanship

Inactive Publication Date: 2008-09-03
CENT SOUTH UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] (1) The concentration of silver nitrate used is relatively low, which is not conducive to large-scale production
[0

Method used

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  • Preparation of nano aluminum powder for conducting resin and storage method
  • Preparation of nano aluminum powder for conducting resin and storage method
  • Preparation of nano aluminum powder for conducting resin and storage method

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Experimental program
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Embodiment

[0036] Embodiment: used silver nitrate (analytically pure), its main component (%) is: AgNO 3 ≥99.8%, water insoluble ≤0.005%, chloride ≤0.001%, sulfate ≤0.004%, Fe≤0.0004%, Cu≤0.001%, Pb≤0.001%, hydrochloric acid non-precipitate ≤0.02%.

[0037] Weigh AgNO 3 3.4g dissolved in 20mL distilled water to make 1.0mol / L AgNO 3 oxidizing solution, and placed in a water bath at 40°C to keep the temperature constant; weigh 1.06g sodium hypophosphite, 3.4g polyvinylpyrrolidone (PVP), 0.43g sodium hexametaphosphate and dissolve them in 100mL distilled water to make a reducing solution, and add 2mL Sulfuric acid (c(H 2 SO 4 )=1.0mol / L) to adjust the pH value to 2; heat the reducing solution on a magnetic stirrer and stir to dissolve it completely, heat to 42°C to maintain a constant temperature, and mix AgNO at a rate of 20 drops / min under high-speed stirring 3 Add the oxidizing liquid dropwise; continue stirring for 30 minutes after the dropwise addition is complete to obtain a purpl...

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Abstract

The invention relates to the preparation and storage method of silver nano-particles for conductive adhesive, in particular to a method for preparing silver nano-particles by reducing high-concentration silver nitrate by adopting a chemical liquid-phase method. The method comprises the following steps: mixing sodium hypophosphite, polyvinyl pyrrolidone and sodium hexametaphosphate to obtain reduction solution, adding sulfuric acid dropwise to adjust pH value, adding silver nitrate solution into the reduction solution under magnetically stirring to obtain silver colloid, standing, centrifugally separating, recovering filtrate, concentrating, centrifugally separating, washing the solid, vacuum-drying to obtain silver nano-particles, sealing and packaging, and storing at low temperature. The method adopts high-concentration silver nitrate solution, and has the advantages of simple process flow, high yield of silver powder, short production cycle and good safety. In the separation process, the filtrate can be recovered to improve the coefficient of recovery of silver powder. The silver nano-particle has spherical shape, uniform particle diameter, narrow distribution, high purity, good dispersibility, good storage stability and long storage time without oxidization, and can be used for conductive filler such as conductive adhesive.

Description

technical field [0001] The invention relates to a method for preparing and storing precious metal nano-silver powder, in particular to a method for preparing nano-silver powder by reducing high-concentration silver nitrate by a chemical liquid phase method. Background technique [0002] Nano-silver powder shows broad application prospects: adding a small amount of nano-silver powder to chemical fiber can improve some properties of chemical fiber products and make it have a strong bactericidal ability; doping an appropriate amount of nano-silver powder in the silicon oxide film can The glass coated with this film has a certain photoluminescence; the efficiency of heat exchangers using nano-silver powder as a diluted refrigerant is 30% higher than that of traditional materials; industrially using nano-silver powder as a catalyst for certain chemical reactions can greatly improve Reaction speed and efficiency, etc.; In addition, the application of nano-silver powder in the elec...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 李芝华王炎伟于倩倩
Owner CENT SOUTH UNIV
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