A kind of preparation method of pitch-based spherical activated carbon with high thermal conductivity

Abstract

The invention discloses a preparing method of pitch-based spherical activated carbon with high heat conductivity. The preparing method comprises the steps of: uniformly mixing high soften point asphalt, naphthalene with a heat conduction agent, and reacting the mixture to prepare modified asphalt; adding modified asphalt into aqueous polyvinyl alcohol, and stirring for 0.5-3 h at 85-150 degrees centigrade to prepare pitch-based spheres; oxidizing and activating pitch-based spheres without dissolving to prepare pitch-based activated carbon spheres; placing pitch-based activated carbon spheres and a nitrogen-containing compound into a high-pressure kettle according to the mass ratio of 1: (0.1-0.3), sealing the kettle, heating the kettle to 150-300 degrees centigrade with the rate of 3-10 degrees centigrade / min, keeping the kettle for 0.5-3h at constant temperature and then cooling the kettle to prepare pitch-based spherical activated carbon. The pitch-based spherical activated carbon has the advantage of excellent heat conductivity.

Description

technical field [0001] The invention belongs to a preparation method of pitch-based spherical activated carbon with high thermal conductivity. Background technique [0002] Pitch-based spherical activated carbon is currently a high-end activated carbon material, but its preparation involves high temperatures from room temperature to above 900°C, and the thermal conductivity of pitch itself is very poor, roughly 0.1 W / (m.k), so that during the heating process , Asphalt absorbs heat very slowly, which greatly affects the diffusion of heat from the asphalt surface to the interior of the asphalt, especially when the heating rate is fast, the temperature difference between the asphalt surface and the interior of the asphalt is large, resulting in poor processing performance of asphalt. In addition, the poor thermal conductivity of activated carbon itself also limits the expansion of its application fields. [0003] The application numbers are 201310673124.1 "Method for preparing...

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Problems solved by technology

[0007] Patent CN98811907.2 "High Thermal Conductivity Carbon / Carbon Honeycomb Structure" uses carbon fiber to obtain a graphitizable carbon matrix through CVD / CVI densification, and then graphitizes to obtain a carbon / carbon composite honeycomb with a thermal conductivity greater than 200W / m.k Structural materials; similarly, the patent CN200410012434.X "a method for rapidly preparing carbon / carbon composite materials with high thermal conductivity" mixes the mesophase pitch-based chopped carbon fiber and the treated mesophase pitch uniformly in proportion, heats up and pressurizes , and then increase the temperature until reaching the graphitization temperature to produce carbon / carbon products with higher thermal conductivity, but these processes are not suitable for the preparation of pitch-based spherical activated carbon