High-heat-conductivity polypropylene composite material and preparation method thereof

Abstract

The invention belongs to the field of high-heat-conductivity materials, and especially relates to a high-heat-conductivity polypropylene composite material and a preparation method thereof. The high-heat-conductivity polypropylene composite material comprises, by weight, 80-100 parts of a heat conducting filler, 0-5 parts of a chopped carbon fiber, 6-15 parts of modified polypropylene, 8-20 partsof high-strength polypropylene, 2-7 parts of high-fluidity polypropylene and assistants. High-strength, high-fluidity and polarity-modified polypropylenes are adopted at different proportions, a powder containing 70-85% by mass of graphite and graphite flakes is added, and a two-stage continuous extrusion composite granulation process is carried out to obtain the heat conducting composite materialwith the high heat conductivity, high mechanical properties and good processability; and the heat conducting coefficient of the polypropylene composite material is 4-26 W / m.k, the tensile strength is15-30 MPa, the elongation at break is 3-5%, and the flow shear rate is 1-6.

Description

technical field [0001] The invention belongs to the field of thermally conductive materials, in particular to a high thermally conductive polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene is one of the substrates of commonly used high thermal conductivity materials, and its thermal conductivity is generally around 0.12W / (m·K). The production process of high thermal conductivity polypropylene composite materials is to add some thermal conductivity fillers to the polypropylene matrix, such as (graphite, graphene, chopped carbon fiber, carbon black, etc.), metal materials (copper, aluminum, etc.) or metal oxide materials ( Aluminum hydroxide, magnesium hydroxide, etc.), granulated by mixing and single-stage extrusion. A heat conduction material with a heat conduction coefficient of 2-4W / (m·K) is obtained, which meets the heat conduction requirements of heat conduction polypropylene products. [0003] In the above-me...

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Problems solved by technology

[0007] In order to solve the problems of poor mechanical properties and poor fluidity of high thermal conductivity polypropylene materials (filler powder content is more than 70%), the present invention provides a high thermal conductivity polypropylene composite material and its preparation method, using high strength, high flow Performance and polar modified polypropylene are coordinated with each other according to different proportions, so that the highly filled polypropylene thermal conductivity material can be prepared to obtain high thermal conductivity, high mechanical properties and good processing properties

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