High-thermal conductivity graphite alkenyl polymer heat conducting film and preparation method thereof
A technology of high thermal conductivity graphite and high molecular polymer, applied in the direction of chemical instruments and methods, semiconductor devices, heat exchange materials, etc., can solve the problems of low thermal conductivity, need to improve machinability, high cost, etc., to improve thermal conductivity Performance, reduced operating costs and environmental pollution, enhanced strength and toughness effects
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Embodiment 1
[0021] Graphene microsheets (with an average radial size of about 70 μm, a thickness of 0.34 nm to 100 nm, and meeting the aforementioned high-quality thin-layer graphene requirements) and polyamic acid (weight-average molecular weight: 8-100,000) in a mass ratio of 1 : 100% mixed, spread evenly on a clean substrate, then heat-treated at 80-350°C for 2 hours, and finally placed in a carbonization furnace for carbonization at 1400°C for 24 hours, and then moved the carbonized material to the graphitization furnace Graphitization was carried out at 2800°C for 24h, taken out and rolled to obtain an artificial thermally conductive graphite film with a thickness of 15μm and a thermal conductivity of 1950W / m·K.
Embodiment 2
[0023] Graphene microsheets (same as Example 1) and epoxy resin (weight-average molecular weight: 340-2200) were mixed in a mass ratio of 1:100, spread evenly on a clean substrate, and then carried out 80-350 ℃ heat treatment for 2 hours, and finally placed in a carbonization furnace for carbonization at 1400°C for 24 hours, then moved the carbonized material to a graphitization furnace for graphitization at 2800°C for 24 hours, took it out and rolled it, and obtained an artificial heat-conducting graphite film. It is 20μm, and the thermal conductivity is 500W / m·K.
Embodiment 3
[0025] Graphene microsheets (same as Example 1) are mixed with high-density polyethylene (weight-average molecular weight: 4-300,000) in a mass ratio of 1:100, spread evenly on a clean substrate, and then carry out 80 Heat treatment at -350°C for 2 hours, and finally placed in a carbonization furnace for carbonization at 1400°C for 24 hours, then moved the carbonized material to a graphitization furnace for graphitization at 2800°C for 24 hours, took it out and rolled it, and made an artificial heat-conducting graphite film. Its thickness is 20 μm, and its thermal conductivity is 400 W / m·K.
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