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Conductive silver paste for TFT-LCD screen

A technology of conductive silver paste and flaky silver powder, which is applied to conductive materials dispersed in non-conductive inorganic materials and other directions, can solve the problems of high cost, easy generation of pores and high silver content, and achieves reduction of manufacturing cost and resistance value. , improve the effect of bonding

Inactive Publication Date: 2018-02-16
HEFEI HUIKE JINYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conductive silver paste used in resistive and capacitive touch screens usually uses metal flake silver powder as the main raw material. In order to ensure the conductivity of the conductive silver paste for screen printing circuits, the silver content of foreign conductive silver paste is mostly 72%. Above, due to the high silver content of the conductive silver paste, the cost is relatively high; while the silver content of the domestic conductive silver paste is relatively low, generally below 60%, and the bonding between the conductive silver paste and the touch screen is poor , The printed circuit printed with conductive silver paste is also prone to air holes, resulting in a higher resistance value of the printed circuit circuit on the touch screen, which also affects the sensitivity of the touch screen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1 A kind of conductive silver paste for TFT-LCD screen, it is made up of the raw material of following percentage by weight: flake silver powder 60%, thermoplastic polyimide resin 14%, macromolecular resin carrier 24%, epoxy resin 15%, diethylene glycol ether acetate 9%, diethylene glycol butyl ether acetate 5%, dispersant 6%, additive 3%, solvent 45%.

[0013] The polymer resin carrier is formed by mixing vinyl acetate resin and polyester resin with a solvent, wherein, by mass percentage, the vinyl vinyl resin is 15-35%, the solvent is 65-85%; the polyester resin is 30-40% , The solvent is 60-70%.

[0014] The particle diameter of the flake silver powder is 2-10 μm, and the tap density is 1.6-3 g / ml.

[0015] The dispersant is one of BYK110, 2025, 361N, and 333 produced by BYK.

[0016] The solvent is selected from lipid solvents or ketone solvents.

Embodiment 2

[0017] Embodiment 2 A kind of conductive silver paste for TFT-LCD screen, it is made up of the raw material of following percentage by weight: flake silver powder 72%, thermoplastic polyimide resin 19%, macromolecular resin carrier 38%, epoxy resin 26%, diethylene glycol ether acetate 17%, diethylene glycol butyl ether acetate 11%, dispersant 10%, additive 6%, solvent 52%.

[0018] The polymer resin carrier is formed by mixing vinyl acetate resin and polyester resin with a solvent, wherein, by mass percentage, the vinyl vinyl resin is 15-35%, the solvent is 65-85%; the polyester resin is 30-40% , The solvent is 60-70%.

[0019] The particle diameter of the flake silver powder is 2-10 μm, and the tap density is 1.6-3 g / ml.

[0020] The dispersant is one of BYK110, 2025, 361N, and 333 produced by BYK.

[0021] The solvent is selected from lipid solvents or ketone solvents.

Embodiment 3

[0022] Embodiment 3 A kind of conductive silver paste for TFT-LCD screen, it is made up of the raw material of following percentage by weight: flake silver powder 66%, thermoplastic polyimide resin 17%, macromolecular resin carrier 29%, epoxy resin 21%, diethylene glycol ether acetate 13%, diethylene glycol butyl ether acetate 9%, dispersant 8%, additive 4%, solvent 50%.

[0023] The polymer resin carrier is formed by mixing vinyl acetate resin and polyester resin with a solvent, wherein, by mass percentage, the vinyl vinyl resin is 15-35%, the solvent is 65-85%; the polyester resin is 30-40% , The solvent is 60-70%.

[0024] The particle diameter of the flake silver powder is 2-10 μm, and the tap density is 1.6-3 g / ml.

[0025] The dispersant is one of BYK110, 2025, 361N, and 333 produced by BYK.

[0026] The solvent is selected from lipid solvents or ketone solvents.

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Abstract

The invention discloses a conductive silver paste for a TFT-LCD screen. The conductive silver paste for the TFT-LCD screen is composed of the following raw materials in percentage by weight: 60 to 72%of flake silver powder, 14 to 19% of thermoplastic polyimide resin, 24 to 38% of polymer resin carrier, 15 to 26% of epoxy resin, 9 to 17% of diethylene glycol ethyl ether acetate, 5 to 11% of diethylene glycol butyl ether acetate, 6 to 10% of dispersing agent, 3 to 6% of additive, and 45 to 52% of solvent. According to the invention, the silver content in the conductive silver paste is reduced,meanwhile, the degree of bonding between the conductive silver paste and an ITO substrate of the TFT-LCD screen is effectively increased, and a resistance value of the touch screen printed circuit isalso reduced. The prepared TFT-LCD screen with the conductive silver paste in the invention has good conductive performance, the TFT-LCD screen has high sensitivity, and the manufacturing cost for theconductive silver paste is also greatly reduced.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display screens, in particular to a conductive silver paste for a TFT-LCD screen. Background technique [0002] With the rapid development of science and technology, touch screen technology has also been widely used in different electronic products such as computers, televisions, mobile phones and digital cameras. The conductive silver paste, the key material printed on the touch screen by screen printing, plays a very important role in the performance parameters of the touch screen made of tin-doped indium oxide (Indium Tin Oxide, ITO for short). At present, the conductive silver paste used in resistive and capacitive touch screens usually uses metal flake silver powder as the main raw material. In order to ensure the conductivity of the conductive silver paste for screen printing circuits, the silver content of foreign conductive silver paste is mostly 72%. Above, due to the high silver ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22
CPCH01B1/22
Inventor 白航空
Owner HEFEI HUIKE JINYANG TECH
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