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Chemical method for preparing nanoscale flaked silver powder

A flake silver powder, nano-scale technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of difficult mass production of flake silver powder, achieve rapid response, good application prospects, The effect of good settling performance

Active Publication Date: 2018-02-23
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for preparing nano-scale flaky silver powder by chemical method to solve the problem that it has been difficult to produce flaky silver powder by chemical method

Method used

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  • Chemical method for preparing nanoscale flaked silver powder
  • Chemical method for preparing nanoscale flaked silver powder
  • Chemical method for preparing nanoscale flaked silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) configuration of reaction raw material solution

[0027] The configuration of liquid A: add 40g of silver nitrate, 200ml of water, and 1g of PVP into a 1L container, and stir at room temperature until the raw materials are fully dissolved;

[0028] Configuration of liquid B: Add 20g of Vc and 200ml of water into a 1L container, stir at room temperature until the raw materials are fully dissolved;

[0029] Configuration of liquid C: Add 3L of water, 0.1g of PVP, 5g of CA, and 1g of CTAB into a 5L container, and stir at room temperature until the raw materials are fully dissolved;

[0030] (2) Preparation of seed crystals

[0031] Add 3L of C solution into a 5L container, add 0.03g of silver nitrate at room temperature, and add 15ml of sodium borohydride solution dropwise after fully dissolving, the concentration of sodium borohydride solution is 0.0038g / ml;

[0032] (3) Preparation of flake silver powder:

[0033] Add liquid A and liquid B into the container conta...

Embodiment 2

[0035] Configuration of liquid A: add 40g of silver nitrate, 350ml of water, and 3g of PVP into a 1L container, and stir at room temperature until the raw materials are fully dissolved;

[0036] Configuration of liquid B: Add 12g of hydrazine hydrate and 350ml of water into a 1L container, and stir at room temperature until the raw materials are fully dissolved.

[0037] Configuration of liquid C: Add 3L of water, 25g of PVP, 3g of CA, 0.5g of CTAB into a 5L container, and stir at room temperature until the raw materials are fully dissolved;

[0038] (2) Preparation of seed crystals

[0039] Add 3L of liquid C into a 5L container, add 0.04g of silver nitrate at room temperature, and add 17ml of sodium borohydride solution dropwise after fully dissolving, the concentration of sodium borohydride solution is 0.0038g / ml;

[0040] (3) Preparation of flake silver powder:

[0041] Add liquid A and liquid B into the container containing liquid C at a constant rate to make them mix e...

Embodiment 3

[0043] Configuration of liquid A: Add 40g silver nitrate, 500ml water, 4g polyvinyl alcohol PVA, 3g polyvinylpyrrolidone PVP into a 1L container, stir at room temperature until the raw materials are fully dissolved;

[0044] Configuration of liquid B: add 32g glucose and 500ml water into a 1L container, stir at room temperature until the raw materials are fully dissolved;

[0045] Configuration of liquid C: Add 3L of water, 50g of PVP, 0.1g of CA, and 0.1g of CTAB into a 5L container, and stir at room temperature until the raw materials are fully dissolved;

[0046] (2) Preparation of seed crystals

[0047] Add 3L of C solution into a 5L container, add 0.06g of silver nitrate at room temperature, add 20ml of sodium borohydride solution dropwise after fully dissolving, the concentration of sodium borohydride solution is 0.0038g / ml;

[0048] (3) Preparation of flake silver powder:

[0049] Add liquid A and liquid B into the container containing liquid C at a constant rate to m...

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Abstract

The invention relates a chemical method for preparing nanoscale flaked silver powder, and belongs to the field of preparation of micro-nano silver materials. The chemical method comprises the steps that reaction raw material solutions are prepared, seed crystals are prepared, the solution A and the solution B are added into a container containing the solution C at a constant speed, the solutions are mixed to be uniform and sufficiently reacted, and the product is filtered, washed, dried under vacuum and then stored. According to the chemical method, reaction conditions are mild, reaction is rapid, a reaction system has the high solid content, silver powder collection and washing are facilitated, meanwhile, waste water drained during large-scale production can be reduced, and a feasible path is provided for preparing micro-nano flaked silver powder on a large scale through the chemical method. The prepared flaked silver powder is uniform in size, regular in morphology and good in application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of micro-nano silver materials, and relates to a method for chemically preparing micro-nano flaky silver powder suitable for conductive pastes which can be mass-produced. Background technique [0002] Conductive paste mainly includes two types of burn-in conductive paste and curable conductive adhesive (conductive ink), among which curable conductive ink can be widely used in printed circuit and electronic packaging industries. According to the different fillers in the conductive paste, it can be divided into carbon paste (graphite conductor), metal paste (gold powder, silver powder, copper powder, silver-copper alloy) and so on. In terms of conductivity, noble metal paste has the best conductivity, followed by carbon paste. Among many precious metal conductive materials, the price of gold is too high, and the oxidation resistance of copper powder is not good, which makes silver powder occupy an import...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0551B22F1/068B22F1/054
Inventor 李雪嵩王洪超邢志军
Owner CHANGCHUN GOLD RES INST
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