Polyimide film for graphite flake, preparation method thereof, and graphite flake prepared therefrom
A technology of polyimide film and graphite sheet, applied in the field of graphite sheet and polyimide film, can solve the problems of increasing manufacturing cost and high power consumption, and achieve the effect of good thermal conductivity and reducing manufacturing cost.
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Embodiment 1
[0073] First, 50 g of pyromellitic anhydride as a dianhydride monomer, 50 g of 4,4'-diaminodiphenyl ether as a diamine monomer, 1 g of boron nitride (3M company) as a metal compound, and 300 g as an organic solvent The dimethylformamides are mixed together and then polymerized to prepare a polyamic acid solution.
[0074] After that, 100 g of the prepared polyamic acid solution was mixed with 20 g of acetic anhydride as a dehydrating agent, 3 g of β-picoline as an imidizing agent, and 15 g of dimethylformamide, thereby preparing a solution having a final viscosity of 300,000 cP Polyimide precursor composition.
[0075] After that, the prepared polyimide precursor composition was cast to a thickness of 80 μm on a SUS plate (100SA, Sandvik Co., Ltd.) using a doctor blade, and then dried at 100° C. for 5 minutes, thereby forming a gel film. Next, the gel film was separated from the SUS plate, then heat-treated at 300° C. for 5 minutes, and then heat-treated at 500° C. for 5 minu...
Embodiment 2 to 5 and comparative example 1
[0077] A polyimide film was produced in the same manner as in Example 1 except that the amount of the metal compound was changed as listed in Table 1.
[0078] Evaluation example: Measurement of thermal conductivity of graphite sheets (unit: W / m·K)
[0079] Each of the polyimide films produced in Examples and Comparative Examples was heated to 1,000° C. under nitrogen using an electric furnace at a heating rate of 1° C. / min, and then maintained at the temperature for 3 hours to carbonize the polyimide films. Next, the carbonized polyimide film was heated to the temperature shown in Table 1 at a heating rate of 20°C / min under argon, and then the temperature was maintained for 3 hours to graphitize the polyimide film, thereby producing graphite piece.
[0080] Then, the in-plane thermal diffusivity of the fabricated graphite sheets was measured by a laser flash method using a thermal diffusivity tester (LFA 467, Netzsch Co.), and then the measured value of the in-plane therma...
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