Composition for obtaining a carbon-containing composite material
(57) Abstract:The invention is intended for material and can be used to obtain catalysts, sorbents, film heaters. The composition contains, by weight. hours : graphite 100-500; carbon 35-50; antimony trioxide 30-40; chloroparaffin 15-20; phenol-formaldehyde resin 50-70; peroxide Dicumyl 0.3 to 1.0; polyurethane rubber 100; solvent, for example ethyl ester acetic acid 100-150. The composition has operational reliability, temperature stability on electronography surface, retains the basic geometric and physico-chemical characteristics regardless of operating voltage. 1 C.p. f-crystals, 2 tab. The invention relates to the field of materials science and, in particular, to obtain carbon composite materials having conductivity, which can be used in various fields of national economy, for example, for the manufacture of thin film heaters, as carriers of catalysts and adsorbents, in electrocatalysis, electrosorption, electrochemistry, etc.Known carbon-containing composite material having electrical conductivity containing particles Graffigna in the matrix of polyacrylonitrile or polyurethane (EP, 0197745, 1986).The disadvantage of this material is low and short-term adhesion of the graphite particles to the matrix material.Known composition to obtain a carbonaceous material used as a compact adsorbents containing carbon, phenol resin, silicon carbide, ethyl alcohol (EN, 2026735, 1995).Also known composite material used to absorb oil containing graphite, carbon black, synthetic fibers and rubber powder (EN, 2108147, 1998).However, these materials have a low conductive characteristics.Known composite material having a high electrical conductivity containing carbon black and graphite in the form of particles with a predominant size of 0.25-of 0.41 μm uniformly dispersed in a polyimide matrix, and the material can be made in the form of a flexible film (ER, 0413289, 1991).The material has a resistivity of 11010Ohm/cm2and volume of 0.33-2,5106OSM.The closest in technical essence and the achieved result is a composition for obtaining a carbon-containing composition is thermoplastic urethane), polyolefin resin, antimony trioxide, aluminum oxide, cranioleuca and gaidouronisi solvent (SU, 1113391, 1984).The disadvantage is obtained from the known composition of the material is the instability of its properties, especially when changing the operating voltage.The present invention is to provide a composition for obtaining a carbon-containing material with operational reliability, temperature stability on electronography surface and preserves the basic geometrical and physico-chemical characteristics regardless of operating voltage.The problem is solved by the described composition to obtain a carbon-containing composite material containing the following components, wt. including:
Graphite - 100-500
Carbon - 35-50
Antimony trioxide - 30-40
Chloroparaffin - 15-20
Phenol-formaldehyde resin - 50-70
Peroxide Dicumyl - 0,3-1,0
Polyurethane rubber is 100
Solvent - 100-150
Preferably the solvent to use the ethyl ester of acetic acid.When carrying out the invention have been used commercially available substances on the basis of the polymer material according to the invention was prepared as follows. Ball mill load consistently 100 m H. polyurethane rubber, 100 m including graphite, 35 m H. carbon technical element, 15 m CH chloroparaffin, 30 m H. trioxide antimony, 80-100 m H. ethyl ester of acetic acid. Components are mixed with a mechanical stirrer for 15 to 20 hours to obtain a homogeneous mass. After stirring the mixture discharged from the ball mill to a reactor equipped with a mixer. Then the reactor add 20 m H. ethyl ester acetic acid, 50 m H. powdered phenol-formaldehyde resin and 0.3 m H. peroxide of Dicumyl. Stirred reactor 30-40 minutes to dissolve the phenol-formaldehyde resin. Received comprobadas polymeric material is applied by method of irrigation on moving polymeric substrate type Dacron at 80-100oC and utverjdayut in the process of manufacturing products for 10-15 min at (1505)oC.Examples of other specific compounds are shown in table 1, and some operational characteristics of conductive materials obtained from different formulations, including formulations, shown as a comparative, are shown in table 2.It should be noted that the carbon-containing composite material,(size) and physico-chemical characteristics, such as strength and constancy of chemical composition, regardless of the applied voltage in the range 12 to 220 C. 1. Composition for obtaining a carbon-containing composite material having electrical conductivity, containing carbon black, rubber, polyurethane, antimony trioxide, a polymer resin, a solvent, characterized in that the polymer resin it contains phenol-formaldehyde resin and optionally graphite, chloroparaffin and peroxide Dicumyl in the following ratio, wt.h.:
Graphite - 100-500
Carbon - 35-50
Antimony trioxide - 30-40
Chloroparaffin - 15-20
The phenol-formaldehyde resin - 50-70
Peroxide Dicumyl - 0,3-1,0
Polyurethane rubber is 100
Solvent - 100-150
2. Composition under item 1, characterized in that the solvent it contains ethyl ester of acetic acid.
FIELD: chemical industry branches, special technical equipment, possibly manufacture of different articles and heat exchanging systems.
SUBSTANCE: process comprises manufacture of preliminarily prepared coke-filler of green or baked petroleum coke by performing steps of disintegrating till fraction 90 micrometers at content of fraction 20 -50 micrometers no less than 60 -65 %, mixing it with coal cake in relation 5.0 - 2.0 respectively; heating up to 1100 -1300°C; cooling, disintegrating till fraction no more than 90 micrometers; using prepared coke-filler for making molding mass of articles; pressing articles, firing them and graphitizating. Steps of mixing disintegrated coke with cake at relation 5.0 - 2.0, heating mixture, cooling it and again disintegrating may be repeated twice. Density of articles 1.78 - 1.80 g/cm3, compression strength 67.0 - 72.0 MPa.
EFFECT: enhanced quality of articles having no surface flaws.
2 cl, 2 ex
FIELD: nonferrous metallurgy and precision engineering.
SUBSTANCE: invention is intended for use in manufacturing production accessories and tools for electronic treatment. Calcined coke is ground to average particle size between 2 and 20 μm and mixed with medium-temperature coal pitch taken in excess from 3 to 10% of the weight of composition relative to content of pitch providing maximum density and strength of graphite blanks without thermal-vacuum treatment. Resulting mix is subjected to thermal-vacuum treatment under pressure 80-320 hPa and temperature 250-320°C during 1 to 10 h. Thereafter, coke-pitch composition is ground to produce molding powder, from which blanks are pressed. Resulting blanks are fired at 1000-1300°C and graphitized at 2600-3000°C. Fine-grain graphite shows compaction strength 80-120 MPa, density 1.75-1.85 g/cm3, and density variations not exceeding ±0.1 g/cm3.
EFFECT: improved performance characteristics of product.
3 cl, 3 tbl, 22 ex
FIELD: manufacture of updated gasket materials from graphite tape, foil, strips or sheets.
SUBSTANCE: thermally expanded graphite powder is rolled into cloth, 0.1-10 mm thick. In the course of rolling, cloth is subjected to nondestructive testing by means of one or several pairs of measuring sensors placed along its width; each pair of sensors includes transmitting and receiving sensors which are placed on either side of cloth; They are subjected to electromagnetic radiation at frequency of 103-106 Hz and phase shift angle relative to phase of oscillations of wave falling on specimen is measured. Frequency of oscillations is fixed. For obtaining enhanced accuracy of measurements, correcting pair of sensors may be mounted in parallel with measuring sensors. Present density of material is determined by calibration graph of material density versus phase shift angle which is plotted before measurements. At plotting the graph, density of material is determined by direct weight method. Thus, rolling parameters are corrected according to results of determination of present density.
EFFECT: improved quality of flexible material; immediate elimination technological malfunction.
6 cl, 3 dwg, 1 ex
FIELD: chemical industry and special-purpose technique; manufacture of large-sized blanks of shaped articles for chemical and heat-exchange apparatus.
SUBSTANCE: starting coke-filler is mixed with coal-tar pitch and is impregnated with it; then mixture is calcined at temperature of 1100°C and ground to size not exceeding 1.25 mm at content of particles of no more than 0.07 mm in the amount not exceeding 50%. For obtaining fine-grained materials, grinding is continued till particles of 0.5 mm have been obtained. Powder thus obtained is mixed with pitch and blanks are molded from hot coke-pitch mass by extrusion through tip or in mold, after which blanks are subjected to roasting and graphitization. After roasting and graphitization, blanks may be again impregnated with coal-tar pitch and subjected to repeated roasting. Density of material thus made ranges from 1.65 to 1.78 g/cm3, compressive strength ranges from 30.0 to 51.3 Mpa and bending strength ranges from 16 to 26.4 Mpa.
EFFECT: avoidance of rejects.
3 cl, 3 ex
FIELD: atomic industry; chemical industry; metallurgy; heat-and-power engineering; a method and a device for production of the oxygenated graphite.
SUBSTANCE: the invention presents a method of production of the oxygenated graphite and a device for its realization and may be used in atomic, a chemical industry, in metallurgy and heat power engineering at production of a flexible graphite foil, heat-insulating and fire-proof materials, sorbents. Graphite suspension is prepared in 30-98 % sulfuric acid or nitric acid. The ratio of the electroconductivities of the suspension and each acid exceeds 1. The suspension may additionally contain H3POorCH3COOH. The produced suspension is continuously or discretely is discharged through a branch pipe 3 in the reaction chambers 11 of the merry-go-round type reactor 1 with a cylindrical body 2, an annular anode 6 made in the form of a chute and cathodes 10 made the form of vanes. The anode 6 is mounted in the body 2 coaxially with it and is supplied with a jacket of chilling 7. Cathodes 10 are supplied with the separation casings and fixed to a bracket 9 fixed on the shaft 8 of the rotary drives. Anodic oxidizing of graphite conduct without compacting of the anode 6 in absence of the free electrolyte at a constant value of the electric current or at a constant potential of the anode with a message confirming that the current value in both cases is no less than 30 A·h/kg graphite. Cathodes 10 transfer the suspension by a chute of the anode 6. The formed compound of implantation is unloaded through a branch pipe 4, hydrolyzed, flushed, filtered and dried. The invention allows to increase productivity and to produce a foamed graphite after dilatation at 900°C with a high degree of homogeneity and bulk density of 1.1-3.4 g/dm3.
EFFECT: the invention ensures increased productivity and production of the foamed graphite with a high degree homogeneity and good bulk density.
17 cl, 2 dwg, 3 tbl, 5 ex
FIELD: manufacture of articles from carbon materials, electrodes for example.
SUBSTANCE: articles made from carbon materials are heated in electrical furnace and are held to preset degree of graphitization. During heating and holding at heat, present magnitudes of temperature of characteristic point of articles located in end face of blank in center section of upper row is recorded. Moment of discontinuation of holding at heat and switching-off electric power is found from the following formula: : where γ is degree of graphitization; τ1-τ2 is time interval where graphitization takes place, h; F is function characterizing the time dependence of isothermal holding, h required for obtaining preset degree of graphitization versus graphitization temperature; T (τ) is present temperature of characteristic point of articles, °C; is present time, h.
EFFECT: reduced power requirements down to 5% at scheduled graphitization and down to 13% at forced graphitization.
FIELD: atomic industry; chemical industry; metallurgy; heat-and-power engineering; production of the oxidized black lead.
SUBSTANCE: the invention may be used is pertaining to the methods of production of the oxidized black lead and may be used in atomic industry, chemical industry, metallurgy, heat-and-power engineering at production of heat-insulating and refractory materials, a flexible graphite foil, sorbents. Prepare a non-laminated, having electronic conductivity suspension of black lead in 70-98 % H2SO4. The suspension may be further added with H3PO4 orCH3COOH. The gained suspension is fed into to the reactor 1 of the hopper 12 through a branch-pipe 3 by means of a piston 13. In the reaction chamber 9 it is moved by gravity flow along the hollow perforated cathode 7 and gets in contact with the anode 5. The anodic oxidation of the black lead conduct without its prepressing to the anode in absence of a free electrolyte with production of the electrical power in amount of no less than 30 A·h/kg of black lead at a constant value of the electric current or at a constant anode potential. Excess of an acid passes through a separator made out of a filtering fabric 8 and enters in the internal cavity of the cathode 7, one end 11 of which is open and then - into a collector 17. The ionic bond between the cathode 7 and the anode 8 is conducted through the separator 8, preventing an occurrence of a possible short circuit. The ring-type design of the reaction chamber 9 ensures uniformity of treatment of the anode and the least hydraulic resistance. The oxidized black lead is discharged through a branch-pipe 4, hydrolyzed, flushed, filtered and dried. The invention allows to boost productivity and to produce a foam-graphite after its frothing at the temperature of 900°C with a high degree uniformity and a bulk density of 1.5-3.2 g/l.
EFFECT: the invention ensures an increased productivity and production of a foam-graphite with a high degree uniformity and a good bulk density.
22 cl, 4 dwg, 2 tbl, 2 ex
FIELD: production of sorbent on base of thermally expanded graphite used for extraction of water-insoluble compounds from water, soil and hard surfaces; gathering concentrated acids.
SUBSTANCE: proposed plant includes loading bin, proportioner, branch pipe for delivery of carrier gas, branch pipe for delivery of starting raw material (oxidized graphite), expansion chamber, separator with vertical partition and receiving bin. Proposed plant is also provided with ejector and tangential flow swirler combined with it; branch pipe for delivery of starting raw material is provided with external envelope for passing the coolant; ejector is mounted at expansion chamber inlet under outlet hole of starting material delivery branch pipe.
EFFECT: reduced power requirements with no reduction in productivity; improved quality of sorbent.
4 cl, 3 dwg, 1 tbl
FIELD: metallurgy; semiconductor and aeronautical engineering; manufacture of electrodes, seals for aircraft engines and super clean articles.
SUBSTANCE: coke at yield of volatile agents of 4.0-12.0 mass-% in which fraction of size lesser than 0.09 mm is no less than 97 mass-% and fraction of size lesser than 0.045 mm is no less than 91 mass-% is mixed with 30-40 mass-% of coal-tar pitch, 0.015-2.0 mass-% of sterically hindered phenols and/or phenyl phosphites and 0.015-2.0 mass-% of stearic acid. Mass ratio of stearic acid to sterically hindered phenols and/or phenyl phosphites ranges from 1:1 to 2:1. Mixing with coal-tar pitch is performed at temperature of 110-160°C. Mass thus obtained is cooled to room temperature, crushed, ground and blanks at density of 1.01-1.25 g/cm3 are molded and roasted at 1000°C. Roasted blanks are graphitized at temperature rise by the following scheme: to 800°C, 30-60°C/h; to 1500, 5-25°C/h; to 2200°C, 15045°C/h. Holding time at each stage is equal to 3/7 h. Material thus obtained has apparent density of 1650-1870 kg/m3 at compressive strength of 103-160 Mpa and bending strength of 81-88 Mpa.
EFFECT: enhanced efficiency.
2 tbl, 1 ex
FIELD: atomic industry; chemical industry; metallurgy; heat power engineering; methods and reactors for graphite treatment.
SUBSTANCE: the invention is pertaining to the field of the atomic industry, chemical industry, metallurgy and heat power engineering and may be used for production the flexible graphite foil, sorbents, catalytic agents, chemical sources of electric current. Suspension of the graphite in the electrolyte, for example, in the nitric acid having the electronic conduction from the hopper (15) through the branch pipe (8) load into the reaction chamber formed by the cathode (3) and the consumed anode (7) from the anode-soluble in the electrolyte metal or its alloy. The anode (7) is arranged in the lower part of the body of the reactor(1) and is made in the form of the movable band, which ends are consolidated on the unwinding drum (10) and the winding drum (11). On the exterior side of the cathode (3) the diaphragm (5) is disposed. Conduct an anodic oxidation of the graphite with production of the compounds of the anodic oxidation containing the compounds of embedding in the graphite (CEG) and the cations of the metal of the anode (7) at the suspension movement through the reaction chamber. The products of the anodic oxidation are cleared off from the surface of the cathode (3) by the fluoroplastic knife (16) and through the branch pipe (9) unload it into the hopper-collector (17). Then they are subjected to the hydrolysis or they are added with the alkali or the soda ash, flushed and dried with production of the oxidized graphite with the hydroxides of metal or without them. After that they conduct the thermal expansion. The invention allows to make the technological process cheaper and to dilate the production capabilities due to production both of the conventional foam graphite and the composite material based on the foam graphite with addition of the metals or their oxides.
EFFECT: the invention allows to make the technological process cheaper, to dilate the production of the conventional foam graphite and the composite material based on the foam graphite with addition of the metals or their oxides.
11 cl, 1 dwg, 4 ex