Preparation method for mesophase pitch-based high-thermal conductivity graphite material
A technology of mesophase pitch and high thermal conductivity graphite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as difficulty in large-scale preparation of high thermal conductivity graphite materials, and achieve regular arrangement, short production cycle, and high price. cheap effect
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Embodiment 1
[0025] The existing mesophase pitch can be prepared in many ways, such as:
[0026] Mesophase pitch can be prepared in two ways:
[0027] The first is to use pure aromatics as raw materials, such as alkylbenzene, naphthalene, methylnaphthalene, anthracene and phenanthrene, etc. to directly synthesize; generally, HF / BF3, AlCl3, ZrO2 / SO42-solid super acid, etc. are used as catalysts, and the preparation method can be divided into for:
[0028] 1. Heat treatment method: Tetrabenzophenazine is heat-treated at a temperature higher than 500°C for more than 3 hours, and each molecule is directly converted into 100% mesophase pitch after removing 3 hydrogen atoms.
[0029] 2. AlCl3 catalytic method: heat-treat anthracene or naphthalene in the presence of AlCl3 and a small amount of water or nitrogen flow for several hours to cause cationic condensation reaction to produce mesophase pitch with a C / H atomic ratio of 1.22-1.33.
[0030] 3. HF / BF3 catalytic method: Use HF / BF3 as aromat...
Embodiment 2
[0041] Crushing 10: Crushing 200g of mesophase pitch into particles with a particle size of ≤0.154mm, and putting them into a container;
[0042] Foaming 20: Place in an autoclave. The autoclave is filled with nitrogen, and the nitrogen pressure is 1-10MPa. In an autoclave, the mesophase pitch was heated to 390° C. and kept at a constant temperature for 4 hours to obtain an initial foam-like product.
[0043] Prefabrication 30: Place the initial foamed product in a hot-press furnace under an inert atmosphere at a heating rate of 0.1-100°C / min and a pressure of 5-100MPa, and heat the initial product to 600°C-2000°C to obtain an intermediate product .
[0044] Sintering 40: placing the intermediate product in a graphitization furnace under argon flow, heating the intermediate product to 2000-3000°C at a heating rate of 1-50°C / min. After natural cooling, the graphite material with high thermal conductivity can be obtained. The prepared material has a density of 2.08g / cm3 and ...
Embodiment 3
[0046] Crushing 10: Crushing 200g of mesophase pitch into particles with a particle size of ≤0.154mm, and putting them into a container;
[0047] Foaming 20: Place in an autoclave. The autoclave is filled with nitrogen, and the nitrogen pressure is 1-10MPa. In an autoclave, the mesophase pitch was heated to 420°C and held at constant temperature for 3 hours to obtain an initial foam-like product.
[0048] Prefabrication 30: Place the initial foam product in a hot-pressed furnace under an inert atmosphere at a heating rate of 0.1-100°C / min and a pressure of 5-100MPa, and heat the initial product to 600°C-2000°C to obtain an intermediate product.
[0049] Sintering 40: place the intermediate product in a graphitization furnace under argon flow, and heat the intermediate product to 2000-3000° C. at a heating rate of 1-50° C. / min. After natural cooling, the graphite material with high thermal conductivity can be obtained. The prepared material has a density of 2.14g / cm3 and a t...
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