Thermosetting resin composition based on graphene three-dimensional heat conduction network chain, and preparation method thereof

Abstract

The invention discloses a thermosetting resin composition containing a graphene three-dimensional heat conduction network chain, wherein the thermosetting resin composition comprises a thermosetting resin, graphene nanosheets and a one-dimensional linear heat conduction bridging filler. According to the invention, graphene nanosheet is prepared in situ in a thermosetting resin matrix by adopting atechnical route of liquid-phase stripping of graphite while linear carbon fibers or carbon nanotubes and / or inorganic whiskers are introduced, so that the effective construction of a three-dimensional heat conduction network chain structure is promoted, the synergistic effect among multi-dimensional and multi-scale hybrid fillers is fully exerted, and the heat conduction performance of the composite material is greatly improved; the composite material has the advantages of favorable processability, high heat resistance and excellent comprehensive mechanical properties, and widens the application prospects in various fields; and the method used in the invention is safe, simple and convenient, is easy for batch production, can obtain fully stripped and uniformly dispersed graphene nanosheets, and realizes the construction of a three-dimensional heat conduction network chain in thermosetting resin.

Description

technical field [0001] The invention relates to a thermosetting resin composition using graphene to construct a three-dimensional heat-conducting network chain and a preparation method thereof, in particular to a polymer composite material with high thermal conductivity, high mechanical properties and high heat resistance and a preparation method thereof , belongs to the field of functional nanocomposite materials. Background technique [0002] The rapid development of the electronic information industry (especially high-power electronic devices) puts forward higher requirements for thermal management and heat dissipation materials. New lightweight, heat-resistant and flame-retardant thermosetting resin materials are attracting more and more attention, such as epoxy resin and phenolic resin, and also have important application values ​​in the fields of civil, aviation and building materials. However, most thermosetting resins have poor thermal conductivity, and the intrinsi...

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Problems solved by technology

This may be due to the Al on the surface of graphene 2 o 3 Nanoparticles increase the thermal resistance of the interface, which is not conducive to the construction of the thermal network chain

This method also has some other shortcomings: the preparation of graphene nanosheets by redox method requires a large amount of concentrated sulfuric acid and strong oxidant, as well as high-temperature heat treatment at 2200 ° C; the method of surface treatment of graphene is relatively complicated, and high-temperature calcification requires a lot of energy consumption

It can be seen that the technical route and processing conditions of this method are relatively complicated, and the whole process consumes time and energy. However, the thermal conductivity of the final composite resin is only 2.1-2.8W / m K, and the application range of the material is still relatively limited.

[0007] Although graphene has a very high thermal conductivity (~5000W / m K), the incompatibility between graphene and resin matrix will form a large number of interface defects and agglomeration of nanosheets, requiring additional complex graphene modification. or processing means, which increases the difficulty of the preparation process and the cost of material production

However, two-dimensional graphene nanosheets have low activity and limited connection stability, making it difficult to construct an effective heat-conducting network chain in the resin matrix, and when the addition amount is too high, the processing performance and mechanical properties of the material will be significantly damaged.

In addition, from the perspective of composite material processing methods, there is still a lack of effective methods to control the exfoliated state and dispersed form of graphene, which in turn affects the improvement of the thermal conductivity and mechanical properties of composite materials.

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