JPS6013963B2 - Manufacturing method for high-density, high-strength carbon material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a high-density, high-strength carbon material using mesocarbon microbeads as a raw material.

Mesocarbon microbeads (balls) obtained from pitch, asphalt, etc. have the characteristics of both pitch and coke, and can be solidified without the need for a binder.
It has the characteristic that carbon material can be obtained. In other words, general carbon materials use materials that do not phosphorize by themselves, such as coke, as aggregates, add a binder of 30 to 5% by weight, and go through the processes of grinding, crushing, and molding, but mesocarbon microbeads This means that molded cords can be made without going through the processes of mixing and crushing. However, mesocarbon microbeads have the disadvantage that only molding and tying can produce products that are not much different in specific gravity and strength from general carbon materials. Also, those with a high volatile content have a high content of 8 resins, and are thought to be able to obtain high density and high strength, but lamination occurs during molding, making it impossible to obtain a satisfactory carbon material. The purpose of the present invention is to solve these drawbacks and to obtain a new carbon material with high density and high strength using mesocarbon microbeads. The reason why high density and high strength carbon materials obtained from mesocarbon microbeads cannot be obtained is that the spherical shape remains unchanged even when molded at a pressure of about 1000k9/m, so mesocarbon The microbeads are in point contact with each other,
In addition, since the particles are fine particles (average particle size of about 10 μm), the particles do not pack well, resulting in small shrinkage at dawn, and it is thought that the density and strength will be low if only molded and fired.

Furthermore, since it is a fine particle, it is difficult to vent air during molding, and it is thought that lamination is likely to occur. The inventors
These problems were solved by tightly packing mesocarbon microbeads and granulating them with a small amount of binder to make the point contact points between the particles dense, resulting in a high-density and high-strength carbon material. Granulation is carried out using commonly used methods such as sieves, machines, ball mills, spray dryers, and beletizers, and binders include commonly used binders such as polyethylene glycol, polyvinyl alcohol, methyl cellulose, glue, honey, and dextrin tarpitz. , used in aqueous solution or neat. This will be explained below using examples. Example 1 5% by weight of an 8% by weight aqueous solution of polyvinyl alcohol (degree of polymerization 1400) was added to mesocarbon microbeads with a volatile content of 1% by weight and an 8% resin content of 3.4% by weight. The mixture was mixed for 10 minutes and sieved to less than 2 mm.

This was molded at 1000 k9/m in an inert atmosphere.
The temperature was gradually raised to 00°C and graphitized at about 2800°C. This product had a neck specific gravity of 1.90 and a bending strength of 700 k9/m. Example 2 A carbon material was obtained in the same manner as in Example 1 using mesocarbon microbeads with a volatile content of 2% by weight and a resin content of 7.5%.

This material had a mimari specific gravity of 1.95 and a bending strength of 800k9/m. Comparative Example 1 The carbon microbeads of Example 1 were not granulated,
The apparent specific gravity of the carbon material obtained by forming graphitization in the same way was 1.7u.
The bending strength was 400 kQ.

Comparative Example 2 The mesocarbon microbeads of Example 2 were
It was molded at 1,000 kg/■ and 80,019 mm and lamination occurred.

Comparative Example 3 56% by weight of coke, 5% by weight of graphite, % by weight of tar pitch 4 were mixed for 4 hours from room temperature to 250°C, crushed, shaped and fired to graphitize, and the apparent specific gravity was 1.75 and the bending strength was It was 400 [9/th].

Comparative Example 4 The carbon material of Comparative Example 3 was impregnated with pitch by a conventional method and turned into amorphous graphitization.

Claims (1)

[Claims] 1 Mesocarbon microbeads are granulated with a binder, pressure molded, then fired and graphitized.The apparent specific gravity is 1.90 to 1.95 and the bending strength is 700 to 800K.
A method for producing a high-density, high-strength carbon material of g/cm^2.