A star-branched polyamide-based thermally conductive composite material and its preparation method

Abstract

The invention discloses a star-branched polyamide heat conduction composite material. The star-branched polyamide heat conduction composite material comprises the following components in parts by weight: 5-90 parts of star-branched polyamide resin composition, 5-94.5 parts of heat conduction padding, 0.2-1.5 parts of lubricant, 0.2-1.5 parts of antioxidant, and 0.1-2 parts of coupling agent. The star-branched polyamide resin composition is taken as a matrix resin, so that the dispersity and compatibility of the padding in the matrix resin are improved, the regularity of accumulation of the padding in state of aggregation of the material is effectively improved, and the product has high melt fluidity and is easy to manufacture and shape. Due to good heat stability and special degradation crosslinking property of the star-branched polyamide resin composition, the heat conduction material is endowed with the property of resisting thermal aging for long, and the service life of the heat conduction material is prolonged. The star-branched polyamide heat conduction composite material also has excellent heat conduction efficiency and heat conduction property and high heat diffusion coefficient, and holds both high heat conduction property and good comprehensive mechanical property.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a star-branched polyamide-based heat-conducting composite material, and also relates to a preparation method of the star-shaped branched polyamide-based heat-conducting composite material. Background technique [0002] With the popularity of electronic products, people have higher and higher requirements for electronic products, and the thermal conductivity of electronic products is one of them. The increase of circuit density and load will cause the plastic products in the electronic components to generate a lot of heat during operation. fire. Therefore, there is a need to improve the thermal conductivity of plastics. Metal and plastic heat-conducting materials are currently used as heat-conducting materials. Although metal heat-conducting materials have excellent heat-conducting properties, they have disadvantages such as large specific weight, no corrosion resistance, high p...

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Problems solved by technology

[0004] However, the heat-conducting plastics in the prior art have the following difficulties and defects: because the metal oxide heat-conducting filler itself has limited thermal conductivity, when the filler content is low, the thermal conductivity of the heat-conducting plastic cannot meet the requirements, and the filler content is high (generally greater than 70wt% to meet the heat conduction requirements), the melt fluidity of the thermally conductive plastic is poor, which greatly increases the difficulty of processing; because the thermally conductive filler is an inorganic material, its compatibility with the polymer resin matrix is ​​poor, which will lead to a decrease in the mechanical properties of the thermally conductive plastic Obviously, and the interface thermal resistance will hinder the improvement of thermal conductivity