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Conductive silver paste for fine line laser etching for capacitive type touch screen

A capacitive touch screen, conductive silver paste technology, applied in the direction of circuit, cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of rough edges of lines, large silver powder particles, etc., and achieve smooth surface , The effect of improving the yield rate

Active Publication Date: 2016-07-20
SHANGHAI BAOYIN ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technical solution disclosed in the above-mentioned patent, due to the large size of the silver powder particles in the paste, there are technical problems such as the edge of the line is not smooth after etching.

Method used

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  • Conductive silver paste for fine line laser etching for capacitive type touch screen
  • Conductive silver paste for fine line laser etching for capacitive type touch screen
  • Conductive silver paste for fine line laser etching for capacitive type touch screen

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In this embodiment, a conductive silver paste for laser etching of fine lines of a capacitive touch screen comprises the following components and contents in parts by weight: 70 parts of metallic silver powder, 9 parts of organic vehicle, 19 parts of organic solvent, 0.4 part of defoamer, fluid 0.4 part of leveling agent, 0.2 part of anti-orange peel agent, 0.8 part of thixotropic agent and 0.9 part of pigment.

[0030] Wherein, the metallic silver powder is flake silver powder with a particle size of 0.4 μm and a tap density of 3.8 g / ml.

[0031] The preparation method of the organic carrier is: according to the mass ratio of the polymer resin and the organic solvent as 1:4, add the polymer resin into the organic solvent, heat up to 80°C, keep the temperature constant until the polymer resin is completely dissolved, and then cool to Below 40°C, use a 400-mesh mesh cloth to filter and remove impurities to obtain an organic carrier.

[0032] The polymer resin is polyure...

Embodiment 2

[0055] In this embodiment, a conductive silver paste for laser etching of fine lines of a capacitive touch screen comprises the following components and contents in parts by weight: 70.8 parts of metallic silver powder, 9.4 parts of organic vehicle, 19.6 parts of organic solvent, 0.3 part of defoamer, fluid 0.5 part of leveling agent, 0.3 part of anti-orange peel agent, 0.9 part of thixotropic agent and 1 part of pigment.

[0056] Wherein, the metallic silver powder is flake silver powder with a particle size of 0.6 μm and a tap density of 4 g / ml.

[0057] The preparation method of the organic carrier is: according to the mass ratio of the polymer resin and the organic solvent as 1:4, add the polymer resin into the organic solvent, heat up to 80°C, keep the temperature constant until the polymer resin is completely dissolved, and then cool to Below 40°C, use a 400-mesh mesh cloth to filter and remove impurities to obtain an organic carrier.

[0058] The polymer resin is a sat...

Embodiment 3

[0066] In this embodiment, a conductive silver paste for laser etching of fine lines of a capacitive touch screen comprises the following components and contents in parts by weight: 71 parts of metallic silver powder, 10 parts of organic vehicle, 20 parts of organic solvent, 0.4 part of defoamer, fluid 0.5 part of leveling agent, 0.3 part of anti-orange peel agent, 0.8 part of thixotropic agent and 0.9 part of pigment.

[0067] Wherein, the metal silver powder is a flake silver powder with a particle size of 0.5 μm and a tap density of 3.5 g / ml.

[0068] The preparation method of the organic carrier is: according to the mass ratio of the polymer resin and the organic solvent as 1:3, add the polymer resin into the organic solvent, heat up to 78°C, keep the temperature constant until the polymer resin is completely dissolved, and then cool to Below 40°C, use a 400-mesh mesh cloth to filter and remove impurities to obtain an organic carrier.

[0069] The polymer resin is polyacr...

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Abstract

The invention relates to conductive silver paste for fine line laser etching for a capacitive type touch screen. The conductive silver paste comprises the following components in parts by weight: 65-80 parts of metal silver powder, 5-10 parts of organic carrier, 3-23 parts of organic solvent, 0.1-1 parts of defoaming agent, 0.1-1 parts of leveling agent, 0.1-1 parts of anti-skinning agent, 0-1 parts of thixotropic agent and 0-1 parts of pigment; the preparation method for the conductive silver paste comprises the steps of mixing the organic carrier and the organic solvent to prepare a uniform colloidal solution; then adding the other components in sequence; and enabling the mixture to be mixed through a mixer, grinded through a three-roll mill, filtered, and the like to obtain the conductive silver paste for fine line laser etching for the capacitive type touch screen. Compared with the prior art, the conductive silver paste is simple in preparation process; the prepared conductive silver paste is low in resistance, high in adhesive force, high in surface hardness, corrosion resistance, and oxidization resistance, wherein the adhesive force between the conductive silver paste and a PET substrate can reach 5B level, and the surface hardness can reach greater than 3H; and therefore, the fine lines on the capacitive type touch screen can be manufactured by a laser etching process.

Description

technical field [0001] The invention belongs to the technical field of conductive materials, and relates to a conductive silver paste, in particular to a conductive silver paste for laser etching fine lines of a capacitive touch screen and a preparation method thereof. Background technique [0002] Capacitive touch screen technology uses the current induction of the human body to work. It is a four-layer composite glass screen. The inner surface and the interlayer of the glass screen are coated with a layer of tin-doped indium oxide (ITO for short), and the outermost layer is a thin layer of silica glass protective layer. The interlayer ITO coating is used as the working surface, four electrodes are drawn from the four corners, and the inner ITO layer is the shielding layer to ensure a good working environment. When a finger touches the metal layer, due to the electric field of the human body, the user and the surface of the touch screen form a coupling capacitance. For hig...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00
Inventor 何利娜朱庆明江海涵
Owner SHANGHAI BAOYIN ELECTRONICS MATERIALS CO LTD
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