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Conductive silver paste and preparation method thereof

A technology of conductive silver paste and silver powder, which is used in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of loss of activity, low thixotropic index of silver paste, and low production efficiency, etc. Achieve the effect of improving thixotropic index, shortening production cycle and improving production efficiency

Inactive Publication Date: 2018-11-02
湖南省国银新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method takes a long time to prepare, and the production efficiency is not high; In this method, the organic binder phase and the organic carrier are prepared separately, and the production cycle is long, and the thixotropic agent is dispersed in the organic solvent together with the organic carrier, and the thixotropic agent is dispersed in the organic solvent for a long time. Easy to lose activity at high temperature
The silver paste prepared by this method has a low thixotropic index, and the resolution of the printed silver lines is not high, which cannot meet the requirements of fine line printing.

Method used

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  • Conductive silver paste and preparation method thereof

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preparation example Construction

[0029] Preparation of silver powder

[0030] Dissolve 32Kg of silver nitrate in 300L of deionized water at 40°C under stirring to prepare a silver nitrate aqueous solution, add 3Kg of oleic acid dispersant, mix thoroughly under stirring, and disperse with ultrasonic to obtain a silver salt solution.

[0031] Dissolve 10Kg of sodium hydroxide in 100L of deionized water at 25°C under agitation. It is sufficient to completely dissolve the sodium hydroxide to prepare an aqueous solution of sodium hydroxide.

[0032] Dissolve 10Kg of sodium borohydride in 1000L of deionized water at about 25°C with stirring to obtain a reducing agent solution.

[0033] Fully dissolve 3Kg of hydroxymethylcellulose in 20L of deionized water at about 25°C under stirring conditions to obtain a sedimentation agent solution.

[0034] Under the condition of constant stirring, slowly add the aqueous sodium hydroxide solution into the silver salt solution until the pH value of the solution is equal to 9, s...

Embodiment 1

[0038] A conductive silver paste, its composition and percentage by weight are: 80% silver powder, 15% organic vehicle, 3.5% activated polyamide wax powder, 0.5% simethicone, 0.5% oleic acid, 0.5% BYK-110.

[0039] 1) Organic carrier preparation: take by weighing 10% DBE of the total mass of organic resin and organic solvent, 60% diethylene glycol ethyl ether acetate, 10% dibutyl phthalate, 13% maleic acid resin , 6% of polyphenolic resin, 0.7% of rosin, 0.3% of organic silicon resin are added in the double planetary power mixer mixer with a constant temperature water bath, and the temperature of the water bath is adjusted to be 65°C, and the stirring speed is 800rpm. Mixing 2h, pass through a 200-mesh stainless steel sieve while it is hot, and import it into the transfer barrel;

[0040]2) Thixotropic agent activation: add commercially available polyamide wax (particle size D50 is 40-50 μm), glass beads, xylene and a sand mill with a circulating water bath in a certain propo...

Embodiment 2

[0043] A conductive silver paste, its composition and weight percentage are: 45% silver powder, 50% organic vehicle, 3% activated polyamide wax powder, 2% simethicone oil.

[0044] 1) Preparation of organic carrier: Weigh 90% of the total mass of organic resin and organic solvent, diethylene glycol, 3.7% of rosin, and 6.3% of polymerized rosin and add them to a double planetary power mixer mixer with a constant temperature water bath , adjust the temperature of the water bath to 80°C, the stirring speed to 600rpm, mix the materials for 2 hours, pass through a 200-mesh stainless steel sieve while it is hot, and import it into the transfer barrel;

[0045] 2) thixotropic agent activation: commercially available polyamide wax (particle size D50 is 40-50 μm), glass beads, and xylene are added to a sand mill with a circulating water bath, and the mass ratio of polyamide wax to glass beads is 1.2 : 1.0, the amount of xylene is subject to the ability to wet polyamide wax and glass be...

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Abstract

The invention discloses a conductive silver paste and a preparation method thereof, wherein the conductive silver paste comprises the following components and respective percentages: silver powder of45-80 percent, an organic carrier of 15-50 percent, an activated thixotropic agent of 0.6-3.5 percent, and an auxiliary agent of 0.4-2.0 percent; the organic carrier comprises the following componentsand respective percentages: an organic resin of 10-20 percent, and an organic solvent of 80-90 percent; and the organic solvent is selected from diethylene glycol, dibasic acid Ester (DBE), diethylene glycol diethyl ether acetate, and dibutyl phthalate. The invention combines the preparation of the organic binder phase and the organic carrier, which shortens the production cycle and improves theproduction efficiency. The invention is capable of avoiding the loss of activity due to improper dispersion of the thixotropic agent and increasing the thixotropic index of the conductive silver pasteby separately dispersing the thixotropic agent and the organic resin in the organic solvent, and capable of fully exerting the thixotropic properties by grinding the commercially available polyamidewax in a grinder to obtain polyamide wax powder having a smaller particle size.

Description

technical field [0001] The invention belongs to the field of touch screens, and in particular relates to a conductive silver paste and a preparation method thereof. Background technique [0002] In the 1970s, electronic paste began to rise, and touch screen silver paste came out at the historic moment. Especially after the touch screen was successfully used on mobile phones, people found that it could save a lot of tedious input steps, simplify the device operation interface, and optimize the appearance of the device. , making the human-computer interaction more convenient and friendly, which greatly increases the amount of silver paste on the touch screen. According to relevant media reports, the average annual growth rate of the overall touch panel reaches 50%. It can be seen that not only the current demand for touch screens is huge, but also the development prospects of touch screens are very optimistic. However, most of the conductive silver pastes required for the man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00G06F3/041
Inventor 李蓉杨华荣严红革刘宵王翔陈实杨根
Owner 湖南省国银新材料有限公司
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