Low-silver-content graphene composite conductive silver paste and preparation method thereof

A technology of composite conductivity and silver content, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. Density, reduced production costs, and improved electrical conductivity

Inactive Publication Date: 2014-12-10
NINGBO PLUS ONE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conductive silver pastes prepared by the above two patents both use nanoparticles, including nano-silver particles and nano-copper particles. The preparation process of these nanoparticles is relatively complicated, and the production cost itself is also high, which is obviously not conducive to widespread application.

Method used

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  • Low-silver-content graphene composite conductive silver paste and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0027] (1) Preparation of organic carrier

[0028] Add 80 grams of 1,4-dimethylnaphthalene to a three-necked round-bottom flask, heat it in a water bath to 60oC, measure 20 grams of polyvinyl acetate particles and slowly add it to the above solution, and keep stirring. After the addition of the resin, the water bath temperature Raised to 80oC constant temperature for 8 hours to obtain light yellow transparent viscous resin solution.

[0029] (2) Preparation of base silver paste

[0030] Take 30 grams of the organic carrier solution prepared in (1), add it to a 200 ml beaker, keep stirring slowly, successively measure 2 grams of turpentine oil and 0.3 grams of methyl silicone oil into the carrier solution, stir at a high speed until the mixture is uniform, and then weigh 10 gram of graphene flakes, slowly add, keep stirring, after adding, stir at a high speed until graphene flakes are evenly dispersed in the carrier, then measure 60 grams of silver-coated glass powder (silver-...

Embodiment 1

[0033] Take 20 grams of the base silver paste prepared in (2), add 1 gram of 1,4-dimethylnaphthalene, and mix at a high speed in a high-speed disperser until the slurry is uniform. After cooling to room temperature, measure its viscosity to be about 50,000 centimeters moor. The silver paste was printed onto the PET film by screen printing (220 mesh screen), and dried in a constant temperature oven at 120oC for 10 minutes to obtain a conductive film with a thickness of about 25 μm, and then the conductivity of the conductive film was measured. The various performance data of silver paste and conductive film are summarized in Table 1.

Embodiment 2

[0035] Take 20 grams of the base silver paste prepared in (2), add 2 grams of 1,4-dimethylnaphthalene, and mix at a high speed in a high-speed disperser until the slurry is uniform. After cooling to room temperature, measure its viscosity to be about 40,000 centimeters moor. The silver paste was printed onto the PET film by screen printing (220 mesh screen), and dried in a constant temperature oven at 120oC for 10 minutes to obtain a conductive film with a thickness of about 25 μm, and then the conductivity of the conductive film was measured. The various performance data of silver paste and conductive film are summarized in Table 1.

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Abstract

The invention discloses low-silver-content graphene composite conductive silver paste. The low-silver-content graphene composite conductive silver paste is composed of, by weight, 5-15 parts of graphene microchips, 30-50 parts of silver plated glass powder, 5-15 parts of macromolecule resin, 20-40 parts of organic solvent, 1-4 parts of levelling agent and 0.1-1.5 parts of defoamer. The conductive particle graphene microchips and the silver plated glass powder adopted in the silver paste are of a sheet structure respectively, gaps among conductive particles are effectively reduced, stacking density of conductive films is increased, contact area of the particles is enlarged, contractility of the films is reduced, and conductivity of the silver pates is improved; being low in weight and only accounting for 10-20% of pure silver powder, the graphene microchips and the silver plated glass powder which are light do not easily settle in organic carriers, so that stability of the conductive silver paste is improved.

Description

technical field [0001] The invention belongs to the technical field of conductive paste, and relates to a low-silver-content graphene composite conductive silver paste that can be used for screen printing and a preparation method thereof. Background technique [0002] In the field of conductive paste, silver-based paste has the characteristics of high conductivity, stable performance, good printability, and strong bonding strength with the substrate, and is widely used in the production of various electronic components, such as integrated circuits, membrane switches, Electric heating diaphragm, etc. Conductive silver paste is generally composed of silver powder, organic vehicle and other additives. In order to achieve the conductivity required by the application, usually the weight ratio of silver powder in the entire paste must reach 60-85%. This part of the cost accounts for the entire cost of conductive silver paste. more than 90 percent. In the production of many elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/24H01B13/00
Inventor 肖淑勇吴开李智慧
Owner NINGBO PLUS ONE NEW MATERIAL
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