Polycarbonate heat-conducting composite material and preparation method thereof

Abstract

The invention provides a polycarbonate heat-conducting composite material and a preparation method thereof. The composite material comprises components in parts by weight as follows: 100 parts of polycarbonate, 40-70 parts of heat-conducting masterbatch, 10-30 parts of glass fibers, 0.2-0.8 parts of a main antioxidant, 0.3-1.2 parts of an auxiliary antioxidant and 0.5-2.0 parts of a lubricant, wherein the heat-conducting masterbatch comprises components in parts by weight as follows: 30 parts of porous polycarbonate powder, 10-20 parts of carbon black, 5-20 parts of graphene, 5-10 parts of carbon nano-tubes and 5-15 parts of a compatilizer. The preparation method comprises steps as follows: A, preparation of the heat-conducting masterbatch; B, machining of the heat-conducting composite material: the polycarbonate, the heat-conducting masterbatch obtained in Step A, the main antioxidant, the auxiliary antioxidant and the lubricant are mixed in a high-speed mixer, the glass fibers are laterally fed through accurate calibration and extruded by a twin-screw extruder for granulation, and the polycarbonate heat-conducting composite material with higher heat conductivity is prepared.

Description

technical field [0001] The invention relates to the field of preparation of modified composite materials, in particular to a polycarbonate heat-conducting composite material and a preparation method thereof. Background technique [0002] Polycarbonate (PC) is an engineering plastic with superior comprehensive performance, and it is also the fastest growing general-purpose engineering plastic in recent years. It has the advantages of excellent impact toughness, electrical insulation, creep resistance, transparency and non-toxicity. , At present, it is widely used in the casings of automobiles, sports equipment, office equipment, etc., and electronic and electrical components. The parts of some of the above-mentioned application equipment often have fixed and heat-dissipating metal inserts. However, the molding shrinkage of PC and metal is very different, so stress cracking is prone to occur due to the different shrinkage during the injection molding process, or the plastic pa...

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Problems solved by technology

[0003] At present, there are many patent technologies involving the use of metal oxides and other heat-conducting powders to carry out blending and modification of PC, such as Chinese patents CN 101418116A, CN 104004328A, CN 103289342A, etc., but the thermal conductivity of metal oxides is low, and the amount of addition It is very large, and most of the metal oxides will catalyze and oxidize PC, which makes the performance of PC very serious and almost has no practical value, so there is no mass-produced PC thermal conductivity material with practical value on the market; this patent adopts special The dispersion method makes the addition of heat-conducting medium less; through glass fiber reinforcement, the internal stress is released, and it is also conducive to the establishment of a heat-conducting network; the prepared heat-conducting PC not only has high thermal conductivity but also has high mechanical strength. At present, there is no patent that also has Carbon fiber glass fiber reinforced PC thermal conductivity material with high thermal conductivity and good mechanical properties

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