High-thermal-conductivity and high-strength nano composite material and preparation method thereof

Abstract

The invention discloses a high-thermal-conductivity and high-strength nano composite material which is characterized by being prepared from the following raw materials in percentage by weight: (1) 0.1-1.0 wt% of a polydopamine modified graphene composite material and (2) 99.0-99.9 wt% of high-density polyethylene through polymerization, blending, discharging, secondary blending and wire drawing. The invention also discloses a preparation method of the material. The preparation method comprises the following step of: adding dopamine into the spherical graphene to carry out in-situ auto-polymerization by virtue of an in-situ auto-polymerization method. According to the method, the polydopamine modified graphene is added into the high-density polyethylene, and secondary blending of the filler and the matrix and wire drawing are performed, so that the polydopamine modified graphene with low filler amount is uniformly dispersed in the matrix, the interface thermal resistance is reduced, and the comprehensive cost is low. The nano composite material provided by the invention has excellent heat conduction and mechanical properties, and can be widely applied to the heat dissipation fields of automobiles, computers, LEDs and the like.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a nanocomposite material with high thermal conductivity and high strength and a preparation method thereof. Background technique [0002] With the high frequency and high speed of electronic devices and the rapid development of integrated circuit technology, electronic devices have higher and higher requirements for heat dissipation, and fast and effective thermal diffusion has become a very critical technology in material development. Polymer is an ideal thermal management material because of its easy preparation, light weight and low cost. [0003] High-density polyethylene has excellent mechanical properties, good electrical properties, wear resistance, oil resistance, solvent resistance, self-lubrication, corrosion resistance and good processing performance. Its output accounts for about 1 / 4 of the total global plastic output and is widely used in Automot...

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Problems solved by technology

[0004] Chinese patent application publication number is CN10675177A discloses a kind of nylon 6-graphene thermal conductivity masterbatch and preparation method thereof, this method does not pass through filler functionalization and secondary Blending and drawing, directly melt extruding graphene and nylon 6, so that the graphene is unevenly dispersed in the matrix, and the effect of improving thermal conductivity is not obvious. At the same time, due to the large amount of thermal conductive filler added, and the price of graphene materials is relatively high , resulting in a higher overall material cost

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