Silver paste used for grapheme touch screen, and preparation method thereof

A graphene, touch screen technology, used in cable/conductor manufacturing, instruments, electrical digital data processing, etc., to achieve long operating time, superior conductivity, and good printing performance.

Active Publication Date: 2014-01-08
广州市尤特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional conductive silver paste for touch screen is only suitable for substrates such as PET film, PET coated with ITO, and glass coated with ITO. When it is used on graphene transparent film, it cannot achieve excellent adhesion and good adhesion on graphene transparent film. Conductive electric shock

Method used

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  • Silver paste used for grapheme touch screen, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, 96 kg of modified polyimide with a molecular weight of 20,000 to 30,000 and 224 kg of ethylene glycol diglycidyl ether were heated and stirred at 60°C to make them uniform, and then vacuumed and defoamed for 12 minutes under the condition of a vacuum degree of -0.01 MPa to prepare the Organic carrier; add 450kg flake silver powder with a particle size of 4-7μm, 140kg spherical silver powder with a particle size of 1-3μm, 5kg graphene with a particle size of 50nm-5μm, 10kg organic silicon, 10kg 10kg of hydrogenated castor oil, 10kg of phthalate coupling agent, 10kg of hindered phenolic antioxidant and 35kg of diethylene glycol ethyl ether acetate, using three-dimensional mixing technology, through the shear force generated by revolution and rotation, to achieve Mix thoroughly and evenly; finally use a three-roll machine to grind for 2 to 3 times, and after the fineness reaches 5 μm, vacuum defoam for 13 minutes.

Embodiment 2

[0029] First, heat and stir 68kg of polyacrylate with a molecular weight of 20,000 to 30,000, 40kg of vinyl acetate resin with a molecular weight of 20,000 to 30,000, and 162kg of DBE at 80°C, and then vacuumize and degas under the condition of a vacuum of -0.05MPa8 390kg of flake silver powder with a particle size of 4-7μm, 230kg of spherical silver powder with a particle size of 1-3μm, 10kg of graphene with a particle size of 50nm-5μm, 9kg of organic silicon, 1kg 3kg of fumed silica, 11kg of silane coupling agent, 6kg of TNPP, 30kg of isophorone, and 40kg of ethyl methanol, using three-dimensional mixing technology, through the shear force generated by revolution and rotation, to achieve full mixing and uniformity; finally Use a three-roll machine to grind 2 to 3 times, and after the fineness reaches 5 μm, vacuum defoam for 18 minutes.

Embodiment 3

[0031] First, heat and stir 72kg of unsaturated polyester with a molecular weight of 20,000 to 30,000, 50kg of diol diglycidyl ether, 80kg of DBE, and 38kg of diethylene glycol ethyl ether acetate at 70°C, and then vacuum it at -0.02MPa Under the conditions of vacuum degassing for 15 minutes, it is prepared as an organic carrier; then add 480kg of flake silver powder with a particle size of 4-7μm, 200kg of spherical silver powder with a particle size of 1-3μm, and 5kg of graphite with a particle size of 50nm-5μm ene, 2kg of carbon nanotubes with a particle size of 50nm to 200nm, 10kg of silicones, 10kg of 8kg of polyamide wax, 10kg of phthalate coupling agent, 5kg of phosphite and 30kg of isophorone, using three-dimensional mixing technology, through the shear force generated by revolution and rotation, fully mixed evenly; finally Use a three-roll machine to grind 2 to 3 times, and after the fineness reaches 5 μm, vacuum defoam for 12 minutes.

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Abstract

The invention discloses silver paste used for a grapheme touch screen, and a preparation method thereof. The silver paste is prepared from flake-like silver powder, spherical silver powder, inorganic electric conduction additive, organic carrier, accessory ingredient and diluent of residual percentage by weight. The preparation method comprises the following steps of: firstly, preparing the organic carrier; adding the flake-like silver powder, the spherical silver powder, the inorganic electric conduction additive, the accessory ingredient and the diluent into the organic carrier; fully and evenly mixing; finally, grinding by a three-roller machine, and carrying out vacuum defoaming. The silver paste disclosed by the invention has the advantages of good overall performance, convenience in printing, good adhesion property, good bending resistance, good weather resistance, good stability and good electrical conductivity and insulating oil performance and can pass a long-time high-temperature high-moisture aging test and thermal shock tests for more than hundred times, and the requirement on the conductive silver paste by the grapheme touch screen can be satisfied.

Description

technical field [0001] The invention relates to a silver paste for a touch screen and a preparation method thereof. Background technique [0002] Indium tin oxide is an indispensable material in the working layer of a traditional touch screen. The price of indium tin oxide is twice that of silver, and it is brittle and toxic when used in large quantities. The newly developed graphene materials have the characteristics of high conductivity and nanoscale, and the thin films made of them with a thickness of several nanometers to tens of nanometers can meet the requirements of low surface resistance and high light transmittance at the same time, which makes it transparent. The field of electrodes and touch screens has become a hot spot for research and industrialization. The graphene capacitive screen sensor enables the entire touch area to recognize single-finger and two-finger touches and draw lines, and realize single-finger gesture left and right dragging of pictures and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00G06F3/044
Inventor 陈伟朱鑫
Owner 广州市尤特新材料有限公司
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