A kind of conductive silver paste and preparation technology thereof

Abstract

The invention discloses a conductive silver paste and a preparation process thereof, which is composed of the following components in parts by weight: 20-60 parts of silicate binder solution, 0.5-3 parts of graphene powder, and 25-65 parts of flaky silver powder parts, 0.5‑10 parts of additives. The preparation process is as follows: first add the silicate binder solution, graphene powder and additives into a stainless steel container, stir evenly at a speed of 1200 rpm; then grind in a three-roll mill or ball mill until the fineness is 60 μm Next, add flake silver powder and stir evenly at a speed of 600 rpm to obtain conductive silver paste. The technical problem to be solved by the present invention is to provide a silver paste with better environmental protection, better high temperature resistance, stronger electrical conductivity and lower energy consumption.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a conductive silver paste and a preparation process thereof. Background technique [0002] The conductivity of graphene is its most typical advantage. The carrier mobility of graphene at room temperature is about 15000 cm 2 / (V s), this value is more than 10 times that of silicon materials, and more than twice that of indium antimonide (InSb), the material with the highest known carrier mobility. Under certain conditions such as low temperature, the carrier mobility of graphene can even be as high as 250,000 cm 2 / (V·s). Unlike many materials, the electron mobility of graphene is less affected by temperature changes. At any temperature between 50 and 500K, the electron mobility of single-layer graphene is 15000cm 2 / (V·s) or so. The highly conductive graphene powder produced by the "intercalation-expansion-exfoliation" process retains the integrity of the graphene crystal st...

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Problems solved by technology

[0004] Publication Nos. CN109979640A, CN104538085A, CN104143375A, CN110648781A, CN105810292A and other invention patents also disclose other silver pastes and preparation methods thereof, but the ingredients in these solutions contain organic vehicles, organic solvents, glass powder, etc. Decomposition and volatilization will cause serious pollution to the atmosphere, and some solvents or decomposition products are carcinogenic and mutagenic substances, which are more harmful

At the same time, the sintering temperature of the glass powder is greater than 800°C, which also consumes a lot of energy

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