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Conductive silver paste for fine line silk-screen printing for capacitive type touch screen

A capacitive touch screen, conductive silver paste technology, used in circuits, cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, etc. Problems such as short circuits are generated, and the effect of smooth surface, good conductivity, and improved yield can be achieved.

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

With the development of touch screen technology, the technical solutions disclosed in the above patents are no longer applicable to the screen printing process of fine lines. Due to the large silver powder particles, the edges of the lines are not smooth, and short circuits are easy to occur between lines.

Method used

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  • Conductive silver paste for fine line silk-screen printing for capacitive type touch screen
  • Conductive silver paste for fine line silk-screen printing for capacitive type touch screen
  • Conductive silver paste for fine line silk-screen printing for capacitive type touch screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, a conductive silver paste for fine line screen printing of a capacitive touch screen includes the following components and contents in parts by weight: 68 parts of metallic silver powder, 9 parts of organic vehicle, 20 parts of organic solvent, 0.3 parts of defoaming agent, 0.4 part of leveling agent, 0.3 part of anti-orange peel agent, 0.8 part of thixotropic agent and 1 part of pigment.

[0031] Wherein, the metallic silver powder is flake silver powder with a particle size of 3 μm and a tap density of 3.8 g / ml.

[0032] 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.

[0033] The polymer resin is polyurethane...

Embodiment 2

[0047] In this embodiment, a conductive silver paste for fine line screen printing of a capacitive touch screen comprises the following components and contents in parts by weight: 69 parts of metallic silver powder, 10 parts of organic vehicle, 19 parts of organic solvent, 0.4 part of defoamer, 0.5 part of leveling agent, 0.2 part of anti-orange peel agent, 0.9 part of thixotropic agent and 0.9 part of pigment.

[0048] Wherein, the metallic silver powder is flake silver powder with a particle size of 3.5 μm and a tap density of 4 g / ml.

[0049] 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.

[0050] The polymer resin is a saturated poly...

Embodiment 3

[0058] In this embodiment, a conductive silver paste for fine circuit screen printing of a capacitive touch screen includes the following components and contents in parts by weight: 68.6 parts of metallic silver powder, 9.4 parts of organic vehicle, 19.6 parts of organic solvent, 0.3 parts of defoaming agent, 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.

[0059] Among them, the metallic silver powder is flake silver powder with a particle size of 3.2 μm and a tap density of 3.8 g / ml.

[0060] 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.

[0061] The polymer resin...

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Abstract

The invention relates to conductive silver paste for fine line silk-screen printing 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, 3-20 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 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 volume 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 in addition, the conductive silver paste also has an excellent ohmic contact performance.

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 fine circuit screen printing 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...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00G06F3/045
Inventor 何利娜朱庆明江海涵
Owner SHANGHAI BAOYIN ELECTRONICS MATERIALS CO LTD
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