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Ag-AgCl conductive slurry capable of being screen-printed and preparation method thereof

A conductive paste, screen printing technology, applied in conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, material analysis by electromagnetic means, etc., can solve excessive addition, AgCl bulk crystal can not be obtained The problems of fine dispersion and less addition of AgCl dispersion can achieve the effect of reducing material waste, improving detection sensitivity, and improving dispersion state.

Active Publication Date: 2019-12-13
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

[0007] The purpose of the present invention is to provide a Ag-AgCl conductive paste capable of screen printing and a preparation method thereof. The inventors have found that, to adjust the particle size range of Ag particles and AgCl particles in the Ag-AgCl conductive paste, micron silver powder and nano AgCl The combination of particles can well solve the problem that AgCl bulk crystals cannot be finely dispersed and excessively added in slurry grinding, and brings a preparation method with higher AgCl dispersion and less added amount, which can realize Higher detection sensitivity of the sensor

Method used

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  • Ag-AgCl conductive slurry capable of being screen-printed and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Step a: Preparation of Nano-AgCl Particles

[0025] 1 part of polyvinylpyrrolidone (hereinafter referred to as PVP) K90 powder was dissolved in 39 parts of deionized water as a mother solution, and the temperature of the mother solution was controlled at 15°C. Add 12 parts of 50wt% silver nitrate aqueous solution and 10 parts of 20wt% sodium chloride aqueous solution dropwise to mother liquor simultaneously with the speed of 2ml / min, stir and react for 30 minutes, obtain 62 parts of nano-AgCl dispersion liquids with an average particle diameter at 300nm.

[0026] Step b: Isolation of Nano-AgCl Particles

[0027] Add 31 parts of absolute ethanol to the AgCl dispersion prepared in step a, and place it in a water bath to keep the temperature at 60°C. Add 1 part of 30% oleic acid / ethanol solution and stir for 15 minutes. After static separation, the Ag / Cl particle precipitate was obtained by filtration.

[0028] Step c: AgCl carrier preparation

[0029] Add the precipit...

Embodiment 2

[0033] Step a: Preparation of Nano-AgCl Particles

[0034] Dissolve 2 parts of polyvinylpyrrolidone (hereinafter referred to as PVP) K90 powder in 38 parts of deionized water as a mother liquor, and control the temperature of the mother liquor to 15°C. Add 12 parts of 50wt% silver nitrate aqueous solution and 10 parts of 20wt% sodium chloride aqueous solution dropwise to mother liquor simultaneously with the speed of 2ml / min, stir and react for 30 minutes, obtain 62 parts of nano-AgCl dispersion liquids with an average particle diameter at 200nm.

[0035] Step b: Isolation of Nano-AgCl Particles

[0036] Add 31 parts of absolute ethanol to the AgCl dispersion prepared in step a, and place it in a water bath to keep the temperature at 60°C. Add 1 part of 30% oleic acid / ethanol solution and stir for 15 minutes. After static separation, the Ag / Cl particle precipitate was obtained by filtration.

[0037] Step c: AgCl carrier preparation

[0038]Add the precipitated AgCl partic...

Embodiment 3

[0042] Step a: Preparation of Nano-AgCl Particles

[0043] Dissolve 4 parts of polyvinylpyrrolidone (hereinafter referred to as PVP) K90 powder in 36 parts of deionized water as a mother liquor, and control the temperature of the mother liquor to 15°C. Add 12 parts of 50wt% silver nitrate aqueous solution and 10 parts of 20wt% sodium chloride aqueous solution dropwise to mother liquor simultaneously with the speed of 2ml / min, stir and react for 30 minutes, obtain 62 parts of nano-AgCl dispersion liquids with an average particle diameter at 120nm.

[0044] Step b: Isolation of Nano-AgCl Particles

[0045] Add 31 parts of absolute ethanol to the AgCl dispersion prepared in step a, and place it in a water bath to keep the temperature at 60°C. Add 1 part of 30% oleic acid / ethanol solution and stir for 15 minutes. After static separation, the Ag / Cl particle precipitate was obtained by filtration.

[0046] Step c: AgCl carrier preparation

[0047] Add the precipitated AgCl parti...

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Abstract

An Ag-AgCl conductive slurry capable of being screen-printed is composed of the following components in percentage by mass: 35-60 wt% of silver powder, 1.75-3 wt% of AgCl, 8-15 wt% of a resin binder and 22-55.25 wt% of a solvent, wherein the solver powder is sheet-shaped and has a particle size of 1-12 microns, the AgCl is spherical, and the particle size of the AgCl is 50-500 microns and is preferably 80-300nm. The slurry overcomes the defects of high fineness of silver slurry, excessive addition and poor contact between AgCl and silver powder caused by non-uniform AgCl in the slurry grindingprocess. Material waste is reduced, the dispersion state of the slurry is improved, and the detection sensitivity of sensors is improved.

Description

technical field [0001] The invention belongs to the field of printed electronic materials, and in particular relates to a screen-printable conductive paste and a preparation method thereof. Background technique [0002] Silver / silver chloride (Ag-AgCl) electrodes can accurately detect bioelectrical signals. As a relatively mature technology, it has been widely used in EEG, EMG, ECG, etc. There are three fabrication methods for Ag-AgCl electrodes: electrochemical method, pressing method and printing method. The Ag-AgCl electrode obtained by electrochemical method has a thin silver chloride layer on the surface, and the surface is easy to fall off or wear out after long-term use, which affects the performance of the electrode; the Ag-AgCl disc electrode sintered by pressing method usually requires a certain temperature and relatively high temperature. High pressure and cumbersome process are not conducive to mass production; the printing method is to form a thin-layer electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/16H01B13/00G01N27/327G01N27/30
CPCG01N27/30G01N27/327H01B1/16H01B1/22H01B13/00Y02P80/30
Inventor 胡旭伟常鹏飞王默马浩
Owner 青岛纳印新材料科技有限公司
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