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Preparation method of nano-silver wrapping polymer microsphere composite conductive silver paste

A technology of polymer microspheres and composite conduction, which is applied in cable/conductor manufacturing, circuits, electrical components, etc., can solve the problems of nano-silver easy to agglomerate and poor dispersion, and achieve improved conductivity, less reaction time, and improved dispersion and stability effects

Inactive Publication Date: 2013-07-24
深圳磐汩新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for preparing nano-silver-coated polymer microsphere composite conductive silver paste in view of the problem that nano-silver is easy to agglomerate and has poor dispersion in silver paste in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Dissolve 100 grams of acrylic resin in a mixed solvent of 300 grams of toluene and butanone, including 200 grams of toluene and 100 grams of butanone, and stir well; then add 5 grams of 2,4,6-trimethylbenzoyl- Diphenylphosphine oxide, continue to stir evenly; add 5 grams of dispersant polyvinyl alcohol solution with a mass fraction of 6%, stir evenly to obtain a stable suspension, and finally place the suspension under ultraviolet light for photopolymerization , the UV light intensity is 120 W / cm 2 , the light time is 3 minutes, the polymer microsphere dispersion liquid is obtained, filtered, and the polymer microspheres are prepared;

[0022] 2. Add distilled water in the obtained filter cake of step 1, stir, be mixed with 40% polymer microsphere dispersion, get 50 grams of this polymer microsphere dispersion, add the silver nitrate solution of 50 grams 2mol / L and 2.5 grams of dispersant polyvinylpyrrolidone, stir evenly, heat up to 40°C, then add 5 grams of 0.5mol...

Embodiment 2

[0025] 1. Dissolve 100 grams of acrylic resin in a mixed solvent of 600 grams of toluene and butanone, including 400 grams of toluene and 200 grams of butanone, and stir well; then add 0.5 grams of 2,4,6-trimethylbenzoyl- Diphenylphosphine oxide, continue to stir evenly; add 10 grams of dispersant polyvinyl alcohol solution with a mass fraction of 6%, stir evenly to obtain a stable suspension, and finally place the suspension under ultraviolet light for photopolymerization , the UV light intensity is 120 W / cm 2 , the light time is 5 minutes, the polymer microsphere dispersion liquid is obtained, filtered, and the polymer microspheres are prepared;

[0026] 2. Add distilled water in the obtained filter cake of step 1, stir, be mixed with 60% polymer microsphere dispersion, get 50 grams of this polymer microsphere dispersion, add the silver nitrate solution of 150 grams 2mol / L and 10 grams of dispersant polyvinylpyrrolidone, stir evenly, heat up to 60°C, then add 7.5 grams of 0...

Embodiment 3

[0029] 1. Dissolve 100 grams of acrylic resin in a mixed solvent of 450 grams of toluene and butanone, including 300 grams of toluene and 150 grams of butanone, and stir well; then add 0.25 grams of 2,4,6-trimethylbenzoyl- Diphenylphosphine oxide, continue to stir evenly; add 8 grams of dispersant polyvinyl alcohol solution with a mass fraction of 6%, stir evenly to obtain a stable suspension, and finally place the suspension under ultraviolet light for photopolymerization , the UV light intensity is 120 W / cm 2 , the light time is 4 minutes, the polymer microsphere dispersion is prepared, filtered, and the polymer microspheres are prepared;

[0030] 2. Add distilled water in the obtained filter cake of step 1, stir, be mixed with 60% polymer microsphere dispersion, get 50 grams of this polymer microsphere dispersion, add the silver nitrate solution of 100 grams 2mol / L and 5 grams of dispersant polyvinylpyrrolidone, stir evenly, heat up to 60 ° C, then add 25 grams of 0.5 mol / ...

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Abstract

The invention discloses a preparation method of nano-silver wrapping polymer microsphere composite conductive silver paste. The preparation method of the nano-silver wrapping polymer microsphere composite conductive silver paste comprises the following steps: preparing a polymer microsphere by adoption of a photopolymerization method at first; preparing nano silver by adoption of a situ synthesis method and enabling the nano silver to wrap the polymer microsphere at the same time; and preparing the nano-silver warping polymer microsphere composite conductive silver paste at last. The preparation method of the nano-silver wrapping polymer microsphere composite conductive silver paste has the advantages that by means of increase or reduction of radiating time of ultraviolet (UV) light, the morphology of the polymer microsphere is predictable and controllable and particle size distribution is reasonable. Due to the fact that nano-silver powder after the situ synthesis can evenly and compactly wrap the surface of the polymer microsphere, not only can the usage amount of precious metal silver powder and production cost be reduced, but also dispersibility and stability of the nano-silver powder can be improved, and conductive performance of the silver paste can be further improved.

Description

technical field [0001] The invention relates to a method for preparing a composite conductive silver paste, in particular to a method for preparing a composite conductive silver paste coated with nanometer silver and polymer microspheres. Background technique [0002] Silver powder and its electronic paste are the most widely used and the largest amount of precious metal powder in the electronics industry, and are key functional materials for the production of various electronic components. The dispersion of silver powder in conductive silver paste is very important. Due to the small particle size and high surface activation energy of nano-silver powder, it is difficult to disperse and agglomerates easily. [0003] Therefore, how to improve the dispersion stability of nano-silver powder in silver paste has always been a research hotspot. Chinese patent (CN 101003907 B) discloses a method for preparing nano-silver-coated silicon dioxide metal-dielectric composite particles,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00
Inventor 张宇
Owner 深圳磐汩新能源有限公司
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