Application of a kind of soft metal in the preparation of superfine carbon powder

Abstract

The invention relates to the application of a soft metal in the preparation of superfine carbon powder, which belongs to the field of powder technology. The soft metal powder is used as a particle size distribution control agent for the preparation of ultrafine carbon powder; the specific application method is to degumming the short carbon fiber, and then ball milling with the assistance of soft metal powder to obtain ultrafine carbon powder with a special structure. toner. The ultra-fine carbon powder obtained by the present invention has uniform particle size, narrow particle size distribution, and good dispersion performance; meanwhile, the ultra-fine carbon powder also retains the microscopic crystal structure of carbon fiber, so it has excellent strength, high electrical conductivity, and oxidation resistance of carbon fiber. characteristics. The invention successfully solves the problem of uncontrollable particle size and particle size distribution in the preparation process of carbon ultrafine powder by introducing soft metal as the particle size distribution control agent of ultrafine carbon powder, and at the same time solves the problem of uncontrollable particle size distribution during the crushing process. , the obvious problem of damage to the integrity of the graphite or fiber crystal structure.

Description

technical field [0001] The invention relates to the application of a soft metal in the preparation of superfine carbon powder and belongs to the technical field of powder particle size distribution control. Background technique [0002] Ultrafine carbon powder (including graphite powder, carbon fiber powder, etc.) has a particle size of less than 10 μm, has low melting point, high chemical activity, strong magnetism, good heat conduction, and abnormal absorption of electromagnetic waves. It is mainly used in conductive materials (electric brushes, carbon rods, etc.) etc.), wear-resistant lubricating materials (dry powder graphite lubricant, piston cup, etc.). Among them, the most eye-catching is carbon fiber powder, which is a powdery carbon material obtained by secondary processing of high-strength and high-modulus carbon fiber filaments with a carbon content of more than 85%. Excellent performance, small shape, large specific surface area, easy to compound with matrix res...

AI Technical Summary

Problems solved by technology

However, the ultra-fine pulverization technology has a long process flow, complex process cycle, and large equipment investment, and will greatly damage the integrity of the crystal structure of graphite or carbon fiber, reducing the performance of lubrication, thermal conductivity, etc.

In addition, ultra-fine powders are easy to agglomerate during use. For example, when adding copper powder in the form of powder to prepare graphite / copper composite materials, ultra-fine graphite powder spontaneously aggregates during the mixing process, resulting in uneven distribution.

[0004] Chinese patent CN 105088421B discloses a method for preparing carbon fiber powder, which mainly solves the problem of high energy consumption and low production efficiency in the prior art. The method for preparing carbon fiber powder used in this invention includes the following steps: (1) The continuous carbon fiber and the thermoplastic resin in the molten state are sheared, ground, and mixed to obtain a mixture containing carbon fiber powder and the thermoplastic resin; (2) dissolving the thermoplastic resin in the above mixture with a good solvent for the thermoplastic resin; (3) solidifying Liquid separation to obtain the technical scheme of the carbon fiber powder, which better solves this technical problem and can be used in the industrial production of carbon fiber powder

[0007] Japanese patent JPH10273882A discloses a method for preparing carbon fiber powder by using polyacrylonitrile-based carbon fibers, that is, firstly, the polyacrylonitrile-based carbon fibers are slowly passed through an oven heated to 600°C to 700°C (the passing time is 0.5 minutes according to the surface density of the carbon fibers. to 8 minutes) to remove the sizing agent on the carbon fiber (otherwise the carbon fiber is easy to bond when pulverized), and then the carbon fiber powder is obtained by cutting, pulverizing, and (multiple times) grinding. The length of this carbon fiber powder is generally 3~ 300μm, but the particle size distribution of the carbon fiber powder obtained in this patent is wide, the particle size is large, and the hardness is poor, so it is not suitable for use as a reinforcing material

[0008] So far, there is no report on adding particle size distribution control agent in the prior art to control the particle size and distribution of the obtained carbon fiber powder

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