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Carbon microparticle and process for production thereof

A manufacturing method and technology of carbon particles, applied in chemical instruments and methods, final product manufacturing, carbon preparation/purification, etc., can solve the problems of carbon particles, narrow particle size distribution, and spherical particles, etc., to achieve coating Excellent cloth thickness uniformity, reduced coating unevenness, and the effect of easy particle size distribution

Inactive Publication Date: 2012-09-12
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, in the case of producing carbon fine particles from polyacrylonitrile-based polymer fine particles, since the fine particles are produced by polymerization, it is easy to aggregate and difficult to control the reaction in aqueous polymerization with a high copolymerization ratio of polyacrylonitrile. The diameter distribution is wide, and it is difficult to obtain spherical particles (Patent Documents 8 and 9)
A method of producing carbon fine particles with a narrow particle size distribution by using a special polymerization method has been disclosed, but it may be due to the use of fine particles of copolymers composed of copolymerization components such as acrylonitrile copolymerized divinylbenzene and styrene, The quality is not yet sufficient, and there is a problem that sufficient characteristics cannot be obtained (Patent Documents 10 and 11)
That is, compared to conventionally known methods, it is difficult to produce fine carbon particles with a narrow particle size distribution and high quality by an industrially simple method.

Method used

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  • Carbon microparticle and process for production thereof
  • Carbon microparticle and process for production thereof
  • Carbon microparticle and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0451] Next, the present invention will be described in more detail based on examples. The present invention is not limited by these Examples. In the examples, the assays used are as follows.

[0452] (1) Determination of weight average molecular weight

[0453] The weight average molecular weight is a molecular weight calculated by comparing with a calibration curve using polystyrene using gel permeation chromatography.

[0454] Device: LC-10A series manufactured by Shimadzu Corporation

[0455] Column: KD-806M manufactured by Showa Denko Co., Ltd.

[0456] Mobile phase: 10 mmol / L lithium bromide / dimethylformamide solution

[0457] Flow rate: 1.0ml / min

[0458] Detection: Differential Refractometer

[0459] Column temperature: 40°C.

[0460] (2) Calculation method of number average particle size, volume average particle size and particle size distribution

[0461] The particles were observed using a scanning electron microscope (Scanning Electron Microscope JSM-6301NF...

manufacture example 1

[0480] In a reaction vessel equipped with a reflux tube and a stirring paddle, dissolve 99 parts by mass of acrylonitrile and 1 part by mass of itaconic acid in 400 parts by mass of dimethyl sulfoxide, and then add 0.5 parts by mass of benzyl peroxide acyl, heated to 70°C and maintained for 6 hours to carry out polymerization, thereby obtaining a polyacrylonitrile solution. The solution had a weight average molecular weight of 530,000. Add 172 parts by mass of polyvinyl alcohol (Nippon Synthetic Chemical Industry Co., Ltd.'s "Goosenol (registered trademark)" GL-05, weight average molecular weight 10,600, SP value 32.8 (J / cm2) to this solution 3 ) 1 / 2 ), 2776 parts by mass of dimethyl sulfoxide, heated at 80° C., and stirred until all the polymers were dissolved. After the temperature of the system was returned to room temperature, 1500 parts by mass of ion-exchanged water as a poor solvent was added dropwise at a rate of 25 parts by mass / min via a liquid delivery pump to pre...

manufacture example 2

[0482] In a reaction vessel equipped with a reflux tube and a stirring paddle, dissolve 100 parts by mass of acrylonitrile in 400 parts by mass of dimethyl sulfoxide, then add 0.5 parts by mass of benzoyl peroxide, and keep at 70°C for 6 hours Polymerization was performed to obtain a polyacrylonitrile solution. The solution had a weight average molecular weight of 470,000. Add 100 parts by mass of polyvinyl alcohol ("Goosenol (registered trademark)" GL-05 manufactured by Nippon Synthetic Chemical Industry Co., Ltd., weight average molecular weight 10,600, SP value 32.8 (J / cm2) to this solution 3 ) 1 / 2 ), 1400 parts by mass of dimethyl sulfoxide, heated at 80° C., and stirred until all the polymers were dissolved. After the temperature of the system was returned to room temperature, 1500 parts by mass of ion-exchanged water as a poor solvent was added dropwise at a rate of 25 parts by mass / min via a liquid delivery pump to precipitate fine particles while stirring at 450 rpm....

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Abstract

A process for producing carbon microparticles, characterized in that synthetic resin microparticles, metal-containing synthetic resin microparticles or child-particle-containing synthetic resin microparticles are subjected to carbonization baking, wherein the synthetic resin microparticles, the metal-containing synthetic resin microparticles or the child-particle-containing synthetic resin microparticles are produced by a process comprising mixing a polymer (A) such as polyacrylonitrile copolymer microparticles composed of a copolymer of an acrylonitrile monomer and a hydrophilic vinyl monomer with a polymer (B) that is different from the polymer (A) in an organic solvent to produce an emulsion and bringing the emulsion into contact with a poor solvent for the polymer (A), thereby causing the polymer (A) to precipitate; and the carbon microparticles.

Description

technical field [0001] The present invention relates to fine carbon particles with narrow particle size distribution and good quality and their production method. Background technique [0002] Carbon fine particles are widely used in heat-resistant fillers, reinforcing agents for composite materials, fillers, etc., automotive parts, motor parts, and industrial machinery due to their excellent mechanical properties, chemical resistance, heat resistance, wear resistance, and electrical conductivity. , the use of business equipment, and in order to further improve the functionality in the future, carbon particles with good quality and narrow particle size distribution are required. [0003] Furthermore, metal-containing carbon fine particles imparted with magnetic properties and catalytic functions in order to impart functionality to the carbon fine particles, or porous carbon fine particles having pores inside to increase the specific surface area, etc., have attracted attenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J23/745
CPCA61K9/5089B01J21/18B01J23/06B01J23/26B01J23/34B01J23/70B01J23/745B01J35/023B01J37/084C01P2004/51C01P2004/61C01P2004/62H01M4/133H01M4/1393A61K49/1818H01M8/1007C01B32/05B29B9/10B29B9/12B29B2009/125Y10T428/2982Y02P70/50Y02E60/50Y02E60/10
Inventor 浅野到竹崎宏
Owner TORAY IND INC
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