Preparation method and application of silver powder dispersoid

A technology of dispersion and silver powder, which is used in conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, electrical components, etc., can solve the problems of easy agglomeration, high surface energy of nano-silver powder, limited improvement effect, etc.

Active Publication Date: 2021-07-30
湖南中伟新银材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the silver powder content is an effective way to improve conductivity, but it significantly increases the cost, and too high silver powder content will affect the adhesion and mechanical properties of the silver paste
Another method is to use nano-silver powder instead of traditional micro-silver powder, and use the specific surface area effect of nano-silver powder to improve conductivity. This method needs to overcome the defect that nano-silver powder is easy to agglomerate, but nano-silver powder has a high surface energy and is easy to agglomerate. The improvement effect of the method is limited, which limits the application of conductive silver paste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh micron silver powder (average particle size 3μm), nano silver powder (average particle size 50nm), polyethylene glycol, quaternary ammonium salt cationic surfactant, silane by weight ratio 9:1:0.5:1:0.2:1.5:0.8 Coupling agent, amino-terminated hyperbranched polyamide, ethylene glycol diglycidyl ether;

[0021] Dissolve polyethylene glycol, quaternary ammonium salt cationic surfactant, and silane coupling agent in deionized water to prepare a mixed solution, add nano silver powder and micron silver powder, ball mill evenly, filter, and dry to make modified silver powder;

[0022] Dissolve amino-terminated hyperbranched polyamide in DMF / NMP mixed solvent with a volume ratio of 1:1, add ethylene glycol diglycidyl ether and the modified silver powder, grind evenly, raise the temperature to 80°C, and continue grinding for 3 hours to prepare into a silver powder dispersion.

Embodiment 2

[0024] Weigh micron silver powder, nano silver powder, polyethylene glycol, quaternary ammonium salt cationic surfactant, silane coupling agent, amino-terminated hyperbranched polyamide, ethyl alcohol by weight ratio 8:2:0.8:1.5:0.2:1.5:1 Diol diglycidyl ether;

[0025] Dissolve polyethylene glycol, quaternary ammonium salt cationic surfactant, and silane coupling agent in deionized water to prepare a mixed solution, add nano silver powder and micron silver powder, ball mill evenly, filter, and dry to make modified silver powder;

[0026] Dissolve amino-terminated hyperbranched polyamide in DMAc / NMP mixed solvent with a volume ratio of 1:1, add ethylene glycol diglycidyl ether and the modified silver powder, grind evenly, raise the temperature to 80°C, and continue grinding for 3 hours to prepare into a silver powder dispersion.

[0027] The silver powder dispersion that embodiment 1 and 2 make and components such as micron silver powder, epoxy resin, curing agent, solvent ar...

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Abstract

The invention discloses a preparation method and application of a silver powder dispersoid. The method comprises the steps of: dissolving polyethylene glycol, a quaternary ammonium salt cationic surfactant and a silane coupling agent with water to obtain a mixed solution, adding nano silver powder and micron silver powder, and ball-milling the mixture well, and carrying out filtering and drying to obtain modified silver powder; and dissolving amino-terminated hyperbranched polyamide in a solvent, adding ethylene glycol diglycidyl ether and the modified silver powder, grinding well, and carrying out heating, grinding and reacting to obtain the silver powder dispersoid. The silver powder dispersoid has better dispersion stability and conductivity and can be applied to preparation of conductive silver paste.

Description

technical field [0001] The invention relates to the technical field of conductive materials, in particular to a preparation method and application of a silver powder dispersion. Background technique [0002] Conductive silver paste is mainly used in printed circuits, semiconductor packaging, solar cells and other fields, and is an important part of electronic products. Silver powder is the key material of conductive silver paste, and its content, particle size, and dispersion stability have a great influence on the performance of conductive silver paste. Increasing the silver powder content is an effective way to improve conductivity, but it significantly increases the cost, and too high silver powder content will affect the adhesion and mechanical properties of the silver paste. Another method is to use nano-silver powder instead of traditional micro-silver powder, and use the specific surface area effect of nano-silver powder to improve conductivity. This method needs to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B1/22
CPCH01B13/00H01B1/22Y02E10/50
Inventor 周文结施文锋
Owner 湖南中伟新银材料科技有限公司
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