A kind of preparation method of rubber-exfoliated graphene composite conductive rubber

Abstract

The invention relates to a preparation method of rubber-exfoliated graphene composite conductive rubber. In this method, after rubber and flake graphite are mixed, the rubber-graphene composite block formed by exfoliating the flake graphite is used as a conductive enhancement raw material, and the graphite rubber block is evenly dispersed in the matrix of the conductive adhesive through the blending and compounding technology to prepare the use Extensive range of high performance graphene composite conductive rubber materials. The product obtained by the invention can greatly reduce the volume resistivity, double the conductivity and mechanical properties of the material, and has the characteristics of low cost, simple process, high efficiency, uniform dispersion and large-scale production.

Description

technical field [0001] The invention relates to a method for preparing high-performance conductive composite rubber by using mechanical force to drive rubber molecules to exfoliate graphite (flaky graphite, expandable graphite, and expanded graphite), and belongs to the field of graphene preparation and application. Background technique [0002] With the development of industrial modernization, the demand for conductive or antistatic products in different fields is becoming more and more extensive, and the requirements for their performance are becoming more and more diverse, such as antistatic rubber, conductive rubber, etc.; especially as electronic products gradually become miniature With the development in the direction of automation, integration, intelligence and portability, the requirements for electronic packaging technology are getting higher and higher. Conductive adhesive with adhesive and conductive properties, has the advantages of low viscosity, easy to use, we...

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Problems solved by technology

For this reason, utilize the high conductivity of nanometer metal particle, graphene sheet layer, prepare conductive glue by the affinity of graphene and resin matrix material, as CN107502257A discloses a kind of preparation method of low-temperature curing high-conductivity slurry and conductive film , using nano-scale silver powder doped with a small amount of graphene as a conductive filler and blended with an organic carrier, it has the advantages of low-temperature curing, high conductivity, high shear strength, and long storage period; the invention of CN106753025A utilizes the high thermal conductivity of graphene With the advantages of low melting point of fibrous metal fillers, the combination of fibrous metal conductive fillers, graphene, thermoplastic polyurethane, sodium lauryl sulfate and mixed solvents improves the conductivity and bonding strength of conductive adhesives; in the above patents, although graphite The addition ratio of graphene is very high, but it is difficult to effectively improve the conductive efficiency of the composite material, nor can it effectively reduce the cost of the composite material; and the huge specific surface area of ​​industrially produced commercially available graphene makes it have extremely high surface energy and surface activity. In the process of preparation, dispersion, drying, storage and transportation, etc., it is very easy to agglomerate and re-graphitize, so it is difficult to make commercially available graphene uniform in the state of single-layer or few-layer graphene by conventional stirring and mixing methods. Dispersed into the matrix of conductive adhesive to form an effective three-dimensional network conductive structure, it is more difficult to achieve a breakthrough in electrical conductivity, and the "percolation effect" of electrical conductivity occurs, which doubles the volume resistivity of the composite conductive adhesive

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