WO2006112516A1 - 炭素繊維複合シート、その伝熱体用途およびそれに用いるピッチ系炭素繊維マット用シート - Google Patents
炭素繊維複合シート、その伝熱体用途およびそれに用いるピッチ系炭素繊維マット用シート Download PDFInfo
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- WO2006112516A1 WO2006112516A1 PCT/JP2006/308370 JP2006308370W WO2006112516A1 WO 2006112516 A1 WO2006112516 A1 WO 2006112516A1 JP 2006308370 W JP2006308370 W JP 2006308370W WO 2006112516 A1 WO2006112516 A1 WO 2006112516A1
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/46—Non-siliceous fibres, e.g. from metal oxides
- D21H13/50—Carbon fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
- D04H1/4242—Carbon fibres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/042—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with carbon fibres
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
- D01F9/145—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from pitch or distillation residues
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/007—Addition polymers
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4641—Manufacturing multilayer circuits by laminating two or more circuit boards having integrally laminated metal sheets or special power cores
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
- Y10T428/24994—Fiber embedded in or on the surface of a polymeric matrix
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
Definitions
- the present invention relates to a carbon fiber composite sheet using a pitch-based carbon fiber mat, a use as a heat transfer body thereof, and a carbon fiber sheet for the pitch-based carbon fiber mat.
- High-performance carbon fibers can be classified into PAN-based carbon fibers made from polyacrylonitrile (PAN) and pitch-based carbon fibers made from a series of pitches.
- PAN polyacrylonitrile
- Carbon fiber is widely used in aerospace / space applications, architecture / civil engineering, sports / leisure applications, etc., taking advantage of its strength and elastic modulus that are significantly higher than those of ordinary synthetic polymers.
- Carbon fibers have a higher thermal conductivity than ordinary synthetic polymers, but further improvements in thermal conductivity are being considered.
- the thermal conductivity of commercially available PAN-based carbon fibers is usually less than 200 WZ (m ⁇ K) and is not necessarily suitable from the viewpoint of thermal management.
- pitch-based carbon fibers are generally recognized as being more likely to achieve higher thermal conductivity than PAN-based carbon fibers.
- Metal oxides such as aluminum oxide, boron nitride, aluminum nitride, magnesium oxide, zinc oxide, silicon carbide, quartz, aluminum hydroxide, metal nitride, metal carbide, metal hydroxide
- metallic material-based fillers have a high specific gravity and are heavy when combined. I'm getting tired.
- carbon fiber has the advantage that the specific gravity is small and the weight of the composite material can be reduced when added in the same volume as the metallic filler.
- the carbon fiber forms a network in a state where some matrix is interposed.
- the network is formed three-dimensionally, high heat conduction of carbon fiber is achieved not only in the in-plane direction of the molded body but also in the thickness direction. It is considered to be appropriate.
- a conventional composite material made from a woven fabric made of a fiber and made into a composite material has improved in-plane thermal conductivity, the heat conduction in the thickness direction is sufficient to form a network of carbon fibers. It was difficult to say that it was good because it was not possible.
- Japanese Patent Application Laid-Open No. 5-177593 discloses a thermally conductive molded article having high mechanical strength, in which carbon fibers aligned in one direction are impregnated with graphite powder and a thermosetting resin.
- Japanese Patent Laid-Open No. 2-2 4 2 9 1 9 discloses that the physical properties of carbon fibers are improved to improve the physical properties such as thermal conductivity. The improvement is unclear.
- radio waves and electrons move at almost the same frequency outside and inside the device, causing problems such as interference from external radio waves and noise in communication signals emitted from the inside of the circuit. Is in a very serious state.
- the UHF band will be released, and the VHF band that has been used in the past will be released.
- the wavelength of the radio wave used is shorter than that of the radio wave, making it better in terms of diffraction and directivity, but as long as it is a radio wave, interference caused by structures such as buildings is always a problem. A countermeasure is needed.
- the frequency of radio waves used in mobile communication bodies is close, the problem of interference becomes more serious, and it is important to arrange the radio wave environment from the circuit size to structures such as buildings.
- Carbon materials have significantly higher electrical conductivity than ordinary synthetic polymers, which are often insulators. In addition, it has high strength and has unusual properties as a polymer. For this reason, carbon materials are used not only for reinforcing materials but also for applications using electrical conductivity. In addition, the frequency dispersion of the dielectric constant of the carbon material is expected to have a divergence in the GHz region considering the amount of free electrons expected from the electrical conductivity.
- carbon fiber which is a fibrous carbon material
- carbon fiber is a paramagnetic material as a magnetic material, and it is difficult to absorb and reflect radio waves due to magnetic interaction, but it is very light compared to magnetic materials. is there. Therefore, if a radio wave shield using carbon fiber can be produced, it will be a big advantage in terms of weight.
- JP-A-8-6 7 5 4 4 proposes a method of shielding radio waves as a structure using matrix as cement. Further, Japanese Patent Application Laid-Open No. 10-2 5 6 2 4 describes a radio wave absorber using carbon fiber long fibers. Disclosure of the invention
- An object of the present invention is to provide a carbon fiber composite sheet that exhibits appropriate thermal conductivity and has three-dimensionally improved thermal conductivity.
- Another object of the present invention is to provide a carbon fiber composite sheet having the above-described thermal conductivity and exhibiting high flexibility with improved adhesion to a heating element.
- Still another object of the present invention is to provide an application of the carbon fiber composite sheet used for heat transfer or radio wave shielding.
- Still another object of the present invention is to provide a carbon fiber sheet for a carbon fiber mat for the carbon fiber composite sheet.
- the carbon fiber constituting the pitch-based carbon fiber mat has a crystallite size of 5 nm or more in the hexagonal mesh plane direction. This is achieved by a carbon fiber composite sheet characterized by having a thermal conductivity in the thickness direction of 1 WZm ⁇ K or more.
- a carbon fiber sheet for a pitch-based carbon fiber mat for the carbon fiber composite sheet wherein the content of the pitch-based carbon fiber in which the size of the crystallite in the hexagonal network surface direction is 5 nm or more is 80 wt.
- a pitch-based carbon fiber mat having a carbon content of 80% by weight or more, a thickness in the range of 0.05 to 5 mm, and a porosity in the range of 50 to 90% by volume. Achieved by the carbon fiber sheet.
- FIG. 1 is a diagram schematically showing a strip-shaped test piece for flexibility evaluation in the present invention.
- FIG. 2 is a schematic diagram for explaining the flexibility evaluation method in the present invention.
- Examples of the raw material of the carbon fiber constituting the carbon fiber mat used in the present invention include condensed polycyclic hydrocarbon compounds such as naphthalene and phenanthrene, and petroleum-based pitches and coal-based pitches. It is done. Among them, condensed polycyclic hydrocarbon compounds such as naphthylene and phenanthrene are preferable, and optically anisotropic pitch, that is, mesophase pitch is particularly preferable. These may be used alone or in combination of two or more, but it is particularly desirable to use mesophase pitch alone in order to improve the thermal conductivity of the carbon fiber.
- the softening point of the raw material pitch can be obtained by the Mettler method, and is preferably 2550 ° C. or more and 3500 ° C. or less. If the soft shear point is lower than 250 ° C., fusion between fibers and large heat shrinkage occur during infusibilization. If the temperature is higher than 350 ° C, thermal decomposition of the pitch occurs. It becomes difficult to become thread-like.
- the raw material pitch is spun by the melt blow method, and then made into a carbon fiber mat by infusibilization and firing. Each step will be described below.
- the shape of the discharge die used for spinning the pitch fiber which is the raw material of the three-dimensional random matt carbon fiber, but it is preferably smaller than the ratio 3 of the nozzle hole length to the hole diameter. More preferably, those smaller than 1.5 are used.
- the temperature of the nozzle at the time of spinning is not particularly limited, and the temperature at which a stable spinning state can be maintained, that is, the temperature at which the spinning pitch viscosity becomes 2 to 20 OP a ⁇ S, preferably 5 to 30 Pa ⁇ S. If it is.
- the pitch fibers discharged from the nozzle holes are blown with gas at a linear velocity of 100 to 10 and 0 00 m per minute heated to 100 to 35 ° C.
- gas for example, air, nitrogen, or argon can be used as the gas to be blown, but air is preferable from the viewpoint of cost performance.
- Pitch fibers are collected on a wire mesh belt to form a continuous mat, and then cross-wrapped to form a mat.
- the pine comprising pitch fibers thus obtained is infusibilized by a known method and fired at 1,00 to 3,500 ° C.
- the infusibilization is performed at 20 ° C. to 3500 ° C. using air or a gas obtained by adding ozone, nitrogen dioxide, nitrogen, oxygen, iodine, bromine to air, for example.
- air or a gas obtained by adding ozone, nitrogen dioxide, nitrogen, oxygen, iodine, bromine to air, for example.
- the infusible pitch fiber is fired in a vacuum or in an inert gas such as nitrogen, argon or krypton.
- the firing temperature is preferably 2,300 to 3,500 ° C, more preferably 2,500 to 3,500 ° C in order to increase the thermal conductivity of the carbon fiber.
- the carbon fibers of the carbon fiber mat used in the present invention have a crystallite size in the hexagonal network growth direction of 5 nm or more.
- the crystallite size in the hexagonal network growth direction can be determined by a known method, and can be determined by diffraction lines from the (1 10) plane of the carbon crystal obtained by the X-ray diffraction method.
- the reason why crystallite size is important is that heat conduction is mainly borne by phonon, and that phonon is generated by crystals. More desirably, it is 20 nm or more, and more desirably 30 to 300 nm.
- the fiber diameter of the carbon fiber of the carbon fiber mat is preferably 1 to 20 / im. If the length is less than 1 m, the mat shape may not be maintained, resulting in poor productivity. If the fiber diameter exceeds 20 ⁇ m, unevenness in the infusibilization process will become large and some fusion will occur. More desirably, it is 3 to 15 m, and further desirably 5 to 12 m.
- the CV value defined by the following equation is preferably 0.2 or less. More desirably, it is 0.17 or less. If the CV value exceeds 0.2, the number of fibers with a diameter exceeding 20 / zm that causes troubles due to infusibilization increases, which is undesirable.
- D is the fiber diameter of each of the n fibers
- ⁇ 7 is the average value of the n fiber diameters
- n is the number of fibers.
- the fiber length of the carbon fibers in the carbon fiber mat is preferably from 0.01 to 1,00 mm. If it is less than 0.0 l mm, handling as a fiber becomes difficult. On the other hand, if it exceeds 1,000 mm, the fiber entanglement will increase significantly, and handling will be difficult. More preferably, it is 0.1-1500 mm, More preferably, it is 3-300 mm.
- the carbon fiber mat used in the present invention can also be used in the composite sheet of the present invention as the following carbon fiber sheet.
- the carbon fiber sheet is manufactured by manufacturing the pitch fibers on the mat in the same manner as the method for manufacturing the carbon fiber mat, and further sequentially performing the following steps.
- the obtained pitch fiber is infusibilized by a known method and fired at 700 to 900 ° C. Infusibilization is achieved at 20 ° C. to 3500 ° C. using, for example, air or a gas obtained by adding ozone, nitrogen dioxide, nitrogen, oxygen, iodine, bromine to air. Considering safety and convenience, it is desirable to carry out in air.
- the infusibilized pitch fiber is fired in a vacuum or in an inert gas such as nitrogen, argon, or krypton. Preferably, it is carried out under normal pressure and in low-cost nitrogen.
- the pitch fiber that has been subjected to the firing is milled to shorten the fiber, and is sieved as necessary to obtain a pitch-based carbon fiber precursor having a desired average fiber length.
- a pin mill for example, a pin mill, a Victory mill, a jet mill, a high-speed rotating mill, etc. are used.
- an appropriate method is to cut the fiber in a direction perpendicular to the fiber axis by rotating the mouth attached with the blade at high speed.
- the average fiber length of pitch fibers generated by milling is controlled by adjusting the number of rotations of the mouth and the angle of the blade.
- a desired size can be obtained by combining the coarseness of the screen. .
- the carbon fiber is a non-oxidizing atmosphere of the pitch-based carbon fiber precursor that has undergone the above treatment. It is obtained by graphitizing below.
- the graphitization temperature is preferably from 2,300 to 3,500 ° C, more preferably from 2,500 to 3,500 ° C in order to increase the thermal conductivity of the carbon fiber.
- Graphitization is performed with the milled pitch-based carbon fiber precursor, but after the pitch-based carbon fiber precursor is made in the presence of a binder, graphitization may be performed with a binder.
- the carbon fiber sheet used in the present invention has a carbon content of 80% by weight or more, a thickness of 0.05 to 5 mm, and a porosity of 50 to 90% by volume.
- the carbon content is preferably 90% by weight or more.
- a carbon content of less than 80% by weight is not preferable because the thermal conductivity of the carbon fiber sheet is lowered.
- the thickness of the carbon fiber sheet is preferably 0.1 mm to 3 mm. If the thickness is less than 0.05 mm, handling properties and productivity are lowered, and if it exceeds 5 mm, the productivity of the carbon fiber reinforced composite material is deteriorated.
- the porosity of the carbon fiber sheet is preferably 50 to 80% by volume. Deviating from these ranges is not preferable because it tends to cause a problem in handling due to a decrease in mechanical properties and impair resin impregnation during molding of a carbon fiber reinforced composite material.
- the pitch-based carbon fiber which is the carbon fiber of the carbon fiber sheet, has a crystallite hexagonal network surface growth direction size of 5 nm or more, preferably 20 nm or more, more preferably 30 nm or more. .
- the pitch-based carbon fiber has an average fiber diameter in the range of 1 to 20 m, a ratio of the fiber diameter dispersion to the average fiber diameter (CV value) in the range of 0.05 to 0.2, and 1 to It is preferred to have a fiber length in the range of 15 mm.
- the average fiber diameter is less than 1 am, productivity is not preferable because handling property is remarkably lowered. Also, if the fiber diameter exceeds 20 m, unevenness in the infusibilization process will increase and partial fusion will occur. More desirably, it is 3 to 17-m, and further desirably 5 to 15 im.
- the CV value is more preferably 0.07 to 0.18.
- CV value is less than 0.05 If it is, it is not preferable because it is difficult to control the fiber diameter and the productivity is lowered, and if it exceeds 0.2, it is not preferable because it may cause a shape change at the time of firing.
- the average fiber length is preferably in the range of 1 to 15 mm, and if it deviates from this range, it is difficult to produce a homogeneous sheet and it is difficult to obtain the desired thermal conductivity, which is not preferable.
- the true density of the pitch-based carbon fiber strongly depends on the treatment temperature, but is preferably in the range of 1.5 to 2.5 g Zcc. More preferably, it is 1.6 to 2.5 gZ cc.
- the thermal conductivity in the fiber axis direction of the pitch-based carbon fiber is preferably 20 O WZ (m ⁇ K) or more, and more preferably, 300 WZ (m ⁇ K) or more.
- the thermal conductivity in the thickness direction of the pitch-based carbon fiber sheet is preferably 3 WZ (m-K) or more, more preferably 5 W / (m-K) or more.
- the pitch-based carbon fiber sheet is particularly excellent in thermal conductivity and handling properties by satisfying all the above-mentioned ranges.
- the carbon fiber sheet is obtained by papermaking pitch-based carbon fibers in the presence of a binder.
- the binder at least one kind selected from fibrous, fibrid (fine film), pulp, and particulate can be used.
- the binder is easy to get entangled with the pitch-based carbon fiber and needs to improve papermaking properties, and may be a thermoplastic resin or a thermosetting resin.
- the binder it is preferable that at least 1% by weight of the amount used remains carbonaceous.
- thermoplastic resin examples include polyamide, aramid, polyester, polypropylene, polyethylene, and PVA.
- thermo-hardening shelf examples include polyimide resin, urethane resin, epoxy resin, and phenol resin.
- the amount of the non-anode used is preferably 1 to 20% by weight, more preferably 3 to 15% by weight, based on the pitch-based carbon fiber. It is not preferable to deviate from these ranges because the octallability after papermaking is poor.
- -As a papermaking method for pitch-based carbon fiber the fiber is dispersed in a large amount of dispersion.
- the wet papermaking method is preferred.
- the paper-made sheet is then subjected to processing such as force-rendering or firing, if necessary, and the selection of the binder is preferably matched to these processing methods.
- thermoplastic resin such as polyamide, aramid, polyester, polypropylene, or polyethylene is preferable.
- a resin having a relatively high residual carbon ratio such as PVA, aramid, or phenol resin is used. Can be preferably used.
- the firing treatment is performed in an inert gas atmosphere at a temperature of 1,300 ° C. to 3,00 ° C., and the carbon content of the obtained pitch-based carbon fiber sheet is preferably 95 wt. % Or more.
- the matrix resin used in the present invention may be any of a thermosetting resin, a thermoplastic resin, or a thermoplastic elastomer resin.
- thermoplastic resin polycarbonate, polyethylene terephthalate, polyethylene 1,6-naphthalene dicarboxylate, polyamide, polypropylene, polyethylene, polyepoxyetherketone, polyphenylene sulfide, or a copolymer of each of these polymers is used.
- thermoplastic resins more specifically, polyethylene, polypropylene, ethylene monoolefin copolymers such as ethylene-propylene copolymer, polymethylpentene, polychlorinated vinyl, polyvinylidene chloride, polyacetic acid Vinyl, ethylene-vinyl acetate copolymer, polyvinyl alcohol, polyacetal, fluororesin (polyvinylidene fluoride, polytetrafluoroethylene, etc.), polyethylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polystyrene, Polyacrylonitrile, Styrene-acrylonitrile copolymer, ABS resin, Polyphenylene ether (pp E) resin, Modified PPE resin, Aliphatic polyamide, Aromatic polyamide, Polyimide, Polyamideimide, Polymethacrylic acid (Polymethacrylic acid Polymethacrylic acid esters such as chill), polyacrylic acids, polystreptone, polyphenylene ether
- thermoplastic elastomer resin for example, a polyester elastomer is preferable, and as the polyester elastomer, a block copolymer composed of a hard segment and a soft segment is preferable.
- the melting point of such a polyester elastomer is preferably 180 ° C. to 2300 ° C., more preferably 190 ° C. to 2 1 O t :.
- a preferable elastic modulus is 1 or less, O O O M Pa.
- thermoplastic polyester elastomer resins are commercially available, such as TR_E KV, B 4 0 3 2 AT, B 4 0 6 3 AC, P 4 1 4 0 DT, etc. manufactured by Teijin Chemicals Ltd. It is possible. In particular, P 4 1 40 DT and B 4 0 3 2 AT, in which water absorption is suppressed, are preferable.
- thermoplastic polyester elastomer resin in order to improve the stability of the thermoplastic polyester elastomer resin, it can be added with a stabilizer or the like.
- thermosetting resin examples include, for example, epoxy resins, phenol resins, silicone resins, polyurethane resins, polyimide resins, thermosetting polyphenylene ether resins, or thermosetting polyphenylene ether resins. Can be mentioned. These may be used alone or in appropriate combination of two or more. Further, as the matrix resin, a thermoplastic resin and a thermosetting resin can be appropriately mixed and used in order to develop desired physical properties in the carbon fiber reinforced plastic molded article.
- the carbon fiber composite sheet of the present invention can be produced by a known method. Specific molding methods include, for example, an injection molding method, a press molding method, a calendar molding method, an extrusion molding method, a casting molding method, and a professional molding method.
- the press molding method is particularly desirable.
- a carbon fiber mat and a thermoplastic resin are layered, and-heated above the melting temperature of the thermoplastic resin and molded under high pressure.
- the carbon fiber mat is treated with acid, electrolytic coupling, coupling agent,
- the surface may be modified by treating with a ging agent.
- methods such as electroless plating, electrolytic plating, physical vapor deposition such as vacuum deposition, sputtering, and ion plating, chemical vapor deposition, painting, dipping, and mechanochemical methods for mechanically fixing fine particles.
- the surface may be coated with metal or ceramics.
- the mixing ratio of the carbon fiber mat and the thermoplastic polymer resin is not particularly limited, but in order to increase the thermal conductivity, it is preferably 10 to 90% by volume, more preferably 10 to 85% by volume after molding. It is desirable that the carbon fiber is included. More desirably, it is 20 to 65% by volume. Further, the thickness of the carbon fiber composite sheet can be freely set depending on the application, but 0.2 to 10 mm is desirable for improving the molding yield. If the thickness is less than 0.2 mm, uniform molding is difficult, and if it exceeds 10 mm, it is difficult to control thickness unevenness.
- the molding method for obtaining the carbon fiber reinforced composite using the carbon fiber sheet and the injection molding method, the press molding method, the calendar molding method, the extrusion molding method, the casting molding method. And professional molding methods. In addition, the following two methods can be used.
- a matrix resin that has become liquid at room temperature or by heating is introduced into the pitch-based carbon fiber sheet that has been preliminarily placed in the mold by the RIM method, the RTM method, etc.
- a carbon fiber reinforced composite sheet can be obtained by solidifying or curing the resin.
- a carbon fiber reinforced composite sheet can be obtained by charging a pitch-based carbon fiber sheet and a matrix resin into a mold and melt impregnating the matrix resin.
- the matrix resin is preferably formed into a shape such as a sheet that can be easily loaded into the mold, and the matrix resin is preferably impregnated under vacuum and pressure conditions from the viewpoint of degassing properties and impregnation properties.
- the pitch-based carbon fiber sheet may be surface-treated and then a sizing agent may be attached thereto.
- the surface treatment method the surface may be modified by oxidation treatment with electrolytic acid or the like, or treatment with a force pulling agent or sizing agent.
- methods such as electroless plating, electrolytic plating, physical vapor deposition such as vacuum deposition, sputtering, and ion plating, chemical vapor deposition, painting, dipping, and mechanochemical methods for mechanically fixing fine particles. Therefore, the surface of the metal coated with ceramics may be used.
- the sizing agent is preferably 0.1 to 15% by weight, more preferably 0.4 to 7.5% by weight of the pitch-based carbon fiber sheet, and any commonly used sizing agent can be used. Specific examples include epoxy compounds, water-soluble polyamide compounds, saturated polyesters, unsaturated polyesters, vinyl acetate, water, alcohols, and glycols. These can be used alone or as a mixture.
- the thermal conductivity of the carbon fiber of the present invention can be measured by a known method. However, particularly when the purpose is to improve the thermal conductivity in the thickness direction of the carbon fiber composite sheet, the laser-flash The law is desirable.
- the thermal conductivity of carbon fiber itself is several hundred W / (m ⁇ K), but when it is formed, the thermal conductivity decreases rapidly due to the occurrence of defects, air intrusion, and unexpected voids. To do. Therefore, it has been considered that the thermal conductivity of the carbon fiber composite sheet is substantially difficult to exceed 1 WZ (m-K).
- this was solved by using three-dimensional random mat-like carbon fibers, and the carbon fiber composite sheet was made 1 WZ (m-K) or more. More desirably, it is 2 WZ (m-K) or more, and more desirably 5 WZ (m-K) or more.
- a known method can be used for the measurement of radio wave shielding of the carbon fiber composite sheet of the present invention.
- shielding against radio waves generated from electronic equipment can be measured using the stripline method.
- the shielding ability is in the range of 1 to 1 OGHz. In particular, it has a shielding ability greater than 10 dB at 1 to 3 GHz. If the shielding ability is greater than 10dB, it can be considered to have a certain ability.
- the shielding effect is more desirably 12 dB or more, and more desirably 20 dB or more.
- the carbon fiber composite sheet thus obtained can be put into a mold having a predetermined shape, heated to a temperature equal to or higher than the softening point temperature of the thermoplastic resin, and shaped by press molding to form a molded body.
- the molded body thus produced can be suitably used for thermal management. More specifically, the molded body is a heat-dissipating member, a heat-transfer member, or a structure thereof for effectively dissipating heat generated by electronic components such as a semiconductor element, a power source, and a light source in an electronic device or the like. Used as a material.
- a shaping die is processed into an arbitrary shape that can form a shaping die and is used between a heat-generating member such as a semiconductor element and a heat-dissipating member such as a radiator, or a heat sink or semiconductor package.
- a heat-generating member such as a semiconductor element
- a heat-dissipating member such as a radiator, or a heat sink or semiconductor package.
- Parts, heat sinks, heat spreaders, die pads, printed wiring boards, cooling fan parts, heat pipes, housings, etc. can be used.
- the diameter of the carbon fiber mat was obtained by photographing 10 fields of view of the fired fiber under a scanning electron microscope at 800x magnification.
- the thermal conductivity of the carbon fiber is determined by measuring the resistivity of the yarn after firing, and expressing the relationship between the thermal conductivity and the electrical specific resistance disclosed in JP-A-11-11143. From 1).
- ⁇ represents the thermal conductivity WZ ( ⁇ ⁇ ⁇ ) of the carbon fiber
- ER represents the electrical resistivity ⁇ ⁇ of the carbon fiber.
- the crystal size of the carbon fiber mat was determined by the Gakushin method by measuring the reflection from the (110) plane appearing in X-ray diffraction.
- Radio wave shielding was measured using the stripline method in the near field.
- the following (7) and (8) apply to the composite sheet using thermoplastic shelf-elastomer as the matrix resin.
- the thermal conductivity of the carbon fiber composite sheet was determined by a probe method using QTM-500 manufactured by Kyoto Electronics Co., Ltd.
- Flexibility is determined by clipping the longitudinal ends of a carbon fiber composite sheet made with a thickness of 0.5 mm into a 160 mm x 10 mm strip test piece (1 in Fig. 1 and Fig. 2). (2 in Fig. 2) Whether or not it can be combined, and can be hooked on a 15 ⁇ rod (4 in Fig. 2) for 1 minute while applying a load of 100 gf (3 in Fig. 2) to the combined end I investigated whether or not. Good when the ends of strip-shaped specimens are aligned. If no breakage occurred even under a 15 mm ⁇ rod under load, it was evaluated as very good (Figure 2 is a schematic diagram of this state).
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,000 m / min, and the pitch is melted to draw pitch short fibers with an average diameter of 10 m.
- the spun fibers were collected on a belt to form a mat, and then a three-dimensional random mat made of pitch-based short fibers having a basis weight of 250 g / m 2 by cross wrapping.
- This three-dimensional random mat was infusibilized by raising the temperature from 170 ° C to 295 ° C at an average rate of 7 ° CZ in air. An infusible 3D random mat was fired at 2,300 ° C-.
- the average fiber diameter of the three-dimensional random pine-like carbon fiber after firing is 8.5 rn,. Was 15.
- the average fiber length was 40 mm. Crystal
- the child size was 26 nm.
- thermoplastic polymer resin 3D random matte-like carbon fibers were set to a volume ratio of 30%. Kitagawa Seiki Co., Ltd.
- press molding was performed so that the inner 650 mm mold was lmm thick.
- 3-dimensional random Matsudo-shaped electric conductivity of the carbon fiber sheet was 4. 5 X 10- 4 ⁇ ⁇ cm .
- the thermal conductivity was 233WX (m-K).
- the thermal conductivity of the molded carbon fiber composite sheet was measured, it was 1.5 WZ (m-K).
- the density of this sheet was 1.3 gZcc, and its radio wave shielding performance was observed by the stripline method, and it had a shielding performance of 15 dB at 2.0 GHz.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material. This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,000 m / min, and the molten pitch is pulled to produce pitch-based short fibers with an average diameter of 10 xm. Produced.
- the spun fibers were collected on a belt to make a mat, and then a three-dimensional random mat made of pitch-based short fibers with a basis weight of 250 gZm 2 by cross-rubbing.
- This three-dimensional random mat was infusibilized by raising the temperature from 170 ° C to 295 ° C in air at an average rate of 7 ° CZ.
- the infusible 3D random mat was fired at 3,00 ° C.
- the average fiber diameter of the three-dimensional random pine-like carbon fiber after firing was 8 zm, and the CV was 0.16.
- the fiber length averaged 3 Omm.
- the crystallite size was 45 nm.
- 3D random matte carbon fiber was set to a volume ratio of 30%, and Kitagawa Seiki Co., Ltd.
- a vacuum press machine press molding was performed with a 650 mm inner die to a thickness of 1 mm.
- 3-dimensional random Ma Tsu preparative shaped electric conductivity of the carbon fiber sheet was 2 X 10- 4 ⁇ ⁇ cm.
- the thermal conductivity was 587 W / (m-K).
- the radio wave shielding performance was observed by the stripline method, it had a shielding performance of 19 db at 2.5 GHz.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,000 m / min to produce a pitch-type short fiber with an average diameter of 10 m by pulling the melt pitch. did.
- the spun fibers were collected on a belt to form a mat, and then a three-dimensional random mat made of pitch-based short fibers having a basis weight of 250 g / m 2 by cross wrapping.
- This three-dimensional random mat was infusibilized by raising the temperature from 170 ° C to 295 in air at an average temperature rise rate of 7 ° Omin.
- An infusible 3D random mat was fired at 2300 ° C.
- the average fiber diameter of the three-dimensional random matte carbon fiber after firing was 8.5 m, and the CV was 0.17.
- the fiber length averaged 40 mm.
- the crystallite size was 18 nm.
- Kitakawa Seiki Co., Ltd. uses Teijin Kasei Co., Ltd.'s polystrength Ponate film as the thermoplastic polymer resin, and sets the three-dimensional random pine bowl-like carbon fiber to a volume ratio of 30%.
- press molding was performed with a 65 Omm inner die to a thickness of 1 mm.
- Electrical conductivity of the 3-dimensional random pine Bok carbon fibers was 4. 5 X 10- 4 ⁇ ⁇ cm .
- the thermal conductivity was 233WZ (m-K).
- the measured thermal conductivity of the molded carbon fiber composite sheet was 1.3 WZ (m ⁇ K).
- the density of this sheet was 1.4 gZc c and it had a shielding performance of 20 dB at 2.5 GHz.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch has an optical anisotropy ratio of 100% and a softening point of 285. (: It was hot.)
- heated air was ejected from the slit at a linear velocity of 5,000-m / min. m pitch-based short fibers were produced.
- the resulting fibers were collected on a belt to form a mat, and then a three-dimensional random mat made of pitch-based short fibers having a basis weight of 250 g / m 2 by cross wrapping.
- This three-dimensional random mat was infusibilized by raising the temperature from 170 ° C to 295 ° C at an average heating rate of 7 ° C / min.
- An infusible 3D random mat was baked at 3,000 ° C.
- the average fiber diameter of the three-dimensional random matte carbon fiber after firing was 8 / xm, and the CV was 0.16.
- the average fiber length was 30 mm.
- the crystallite size was 45 nm.
- thermoplastic polymer resin Using Teijin Kasei Co., Ltd.'s polystrength Ponate film as the thermoplastic polymer resin, set the three-dimensional random matte carbon fiber so that the volume ratio of the molded product is 30%. Kitagawa Seiki Co., Ltd. Using a vacuum press machine, press molding was performed with a 650 mm inner die to a thickness of lm m. Electrical conductivity of the 3-dimensional random mat-like carbon fibers was 2 X 10- 4 ⁇ ⁇ cm. Thermal conductivity is' 587W / (m.
- Pitch made of condensed polycyclic hydrocarbon compound was used as the main raw material.
- This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air was ejected from the slit at a linear velocity of 5,000 m / min to produce a pitch short fiber with an average diameter of 10 m by pulling the melt pitch. .
- the spun fibers were collected on a belt to form a mat, and then a three-dimensional random mat made of pitch-based short fibers having a basis weight of 250 g / m 2 by cross wrapping.
- This 3D random mat is heated in air from 170 ° C to 295 ° C with an average heating rate.
- the temperature was raised at 7 ° CZ for infusibilization.
- the infusible 3D random mat was fired at 3,00 ° C.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,000 m / min to produce a pitch-type short fiber with an average diameter of 10 m by pulling the melt pitch. did.
- the spun fibers were collected on a belt to form a mat, and then a three-dimensional random mat made of pitch-based short fibers having a basis weight of 250 g / m 2 by cross wrapping.
- This three-dimensional random mat was infusibilized by raising the temperature from 170 ° C to 295 ° C at an average heating rate of 7 ° C / min.
- the infusible 3D random mat was fired at 800 ° C.
- the average yarn diameter of the three-dimensional random matte carbon fiber after firing was 9 m, and the CV was 0.18.
- the average yarn length was 40 mm.
- the crystallite size was 3 nm.
- Kitakawa Seiki Co., Ltd. using a maleic acid modified polypropylene film manufactured by Sanyo Kasei Kogyo Co., Ltd. as the thermoplastic polymer resin, and setting the three-dimensional random matte carbon fiber to a volume ratio of 30%.
- press molding was performed so that the inner diameter was 650 mm and the thickness was 1 mm.
- Electrical conductivity of 3-D random Ma V preparative carbon fibers was 15 X 10_ 4 ⁇ ⁇ cm.
- the thermal conductivity was 35 W / (m-K). When the thermal conductivity of the molded carbon fiber composite sheet was measured, it was 0.3 WZ (m-K).
- thermoplastic resin and resin itself Although the thermal conductivity of the thermoplastic resin and resin itself was improved, the thermal conductivity was smaller than that of the high-temperature fired product.
- the density of this sheet was 1.2 g / cc, and it showed only 8 dB shielding at 2.5 GHz.
- the carbon fiber composite sheet produced in Example 3 was heated to 190 ° C., which is the softening point temperature of the polycarbonate, which is a thermoplastic polymer resin, and was shaped to produce a molded body.
- the formability was good.
- a 20 g weight heated to 70 ° C was placed on the molded body and heated for 150 seconds to bring the temperature of the carbon fiber composite sheet to about 70 ° C. After that, when the weight was removed and the heat was dissipated, it reached 20 ° C after 60 seconds.
- Example 6 instead of the carbon fiber composite sheet, a single polypolyester resin was used as a molded body. The formability was good. A 20 g weight heated to 70 ° C was placed and heated for 150 seconds to bring the temperature of the polycarbonate resin to about 70 ° C. After that, when the weight was removed and the heat was dissipated, the temperature reached 50 ° C after 60 seconds, which was worse than the carbon composite sheet.
- Pitch made of condensed polycyclic hydrocarbon compound was used as the main raw material. This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,000 Om per minute, pulling the melt pitch to produce pitch-based short fibers with an average diameter of 10 m. Produced.
- the spun fibers are collected on a belt to form a mat, which is further weighted by cross wrapping 2
- a three-dimensional random mat composed of 50 g / m 2 pitch short fibers was used.
- This three-dimensional random mat was infusibilized by raising the temperature from 170 ° C to 295 ° C at an average heating rate of 7 ° C / min.
- the infusible 3D random mat was fired at 2,300 ° C.
- the average fiber diameter of the three-dimensional random pine-like carbon fiber after firing was 8.5 xm, and the CV value was 0.15.
- the fiber length averaged 4 Omm.
- the crystallite size derived from the growth direction of the hexagonal mesh plane was 26 nm.
- thermoplastic polyester elastomer resin Using B4032 AT manufactured by Teijin Chemicals Ltd. as the thermoplastic polyester elastomer resin, the volume ratio of the three-dimensional random matte carbon fiber assembly is used. It was set so that it would be 30%, and press molding was performed using a vacuum press machine manufactured by Kitagawa Seiki Co., Ltd. so that the inner diameter was 650 mm and the thickness was 0.5 mm.
- the thermal conductivity of the molded carbon fiber composite sheet was measured and found to be 3WZ (m * K). The flexibility was very good.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch has an optical anisotropy ratio of 100% and a softening point of 285. (: It was hot.)
- heated air was ejected from the slit at a linear velocity of 5,000 m / min, pulling the melt pitch, and an average diameter of 10 m
- the spun fibers were collected on a belt to form a mat, and then a three-dimensional random mat composed of pitch-based short fibers with a basis weight of 250 gZm 2 by cross wrapping.
- This three-dimensional random mat was infusibilized by raising the temperature from 170 ° C to 295 ° C in air at an average rate of 7 ° CZ.
- the infusible 3D random mat was fired at 2,300 ° C.
- the average fiber diameter of the three-dimensional random mat-like carbon fiber aggregate after firing was 8.5 rn, and the CV value was 0.16.
- the average fiber length was 40 mm.
- the crystallite size derived from the growth direction of the hexagonal network surface was 26 nm.
- thermoplastic polyester elastomer resin 3D random matte carbon fiber was set to a volume ratio of 40%, and Kitagawa Seiki Co., Ltd. vacuum Using a press machine, press molding was carried out with a 650 mm inner die to a thickness of 0.5 mm.
- the measured thermal conductivity of the molded carbon fiber composite sheet was 6WZ (m-K). The flexibility was very good.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- the optical anisotropy ratio of this pitch was 100%, and the soft spot was 285 ° C.
- heated air was ejected from the slit at a linear velocity of 5,000 m / min to produce a pitch short fiber with an average diameter of 10 m by pulling the melt pitch. .
- the spun fibers are collected on a belt to form a mat, which is further weighted by cross wrapping 2
- a three-dimensional random mat composed of 50 g / m 2 pitch short fibers was used.
- the three-dimensional random mat was infusibilized by raising the temperature from 1700 ° C to 2 95 5 in 7 minutes at an average heating rate of 7 minutes. An infusible three-dimensional random mat was fired at 3,00 ° C.
- the average fiber diameter of the three-dimensional random matte carbon fiber after firing was 8 m, and the CV value was 0.16.
- the average fiber length was 30 mm.
- the crystallite size derived from the growth direction of the hexagonal mesh plane was 45 nm.
- the three-dimensional random matte carbon fiber aggregate is used as the volume ratio of the molded body.
- the heat conductivity of the molded carbon fiber composite sheet was measured and found to be 7 WZ (m-K). The flexibility was very good.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,00 m per minute, pulling the melt pitch and shortening the pitch system with an average diameter of 10 m.
- Fibers were made. The spun fibers were collected on a belt to form a mat, and then a three-dimensional random mat made of pitch-based short fibers having a basis weight of 2500 g / m 2 by cross wrapping.
- This three-dimensional random mat was infusibilized by raising the temperature from 1700 ° C to 295 ° C at an average temperature rise rate of 7 ° C / min. An infusible 3D random mat was fired at 3,00 ° C. The average fiber diameter of the three-dimensional random pine-like carbon fiber aggregate after firing was 8 am, and the CV value was 0.16. The fiber length averaged 30 mm. The crystallite size was 45 nm.
- the three-dimensional random matte carbon fiber aggregate is used as the volume ratio of the molded body.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,000 m / min, and the pitch is melted to draw pitch short fibers with an average diameter of 10 m.
- the spun fibers were collected on a belt to form a mat, and then a three-dimensional random mat made of pitch-based short fibers with a basis weight of 250 gZm 2 by cross wrapping.
- the three-dimensional random mat was infusibilized by raising the temperature from 170 ° C to 295 ° C at an average temperature increase rate of 7 ° CZ.
- the infusible 3D random mat was fired at 2,300 ° C.
- the average fiber diameter of the three-dimensional random pine-like carbon fiber aggregate after firing was 8.5 urn and the CV value was 0.16.
- the average fiber length was 40 mm.
- the crystallite size was 26 nm.
- thermoplastic polyester elastomer resin Using TR-EK V made by Teijin Chemicals Co., Ltd. as the thermoplastic polyester elastomer resin, set the three-dimensional random matte carbon fiber aggregate to a volume ratio of 30%, and Kitagawa Seiki ( Using a vacuum press manufactured by Co., Ltd., press molding was carried out to a thickness of 0.5 mm with a 650 mm inner die. The measured thermal conductivity of the molded carbon fiber composite sheet was 2.5 W / (m-K). The flexibility was very good.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material. This pitch had an optical anisotropy ratio of 100% and a softening point of 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,000 m / min, pulling the melt pitch, and shortening the pitch system with an average diameter of 1 O ⁇ m.
- Fibers were made. The spun fibers were collected on a belt to form a mat, and then cross-wrapped to form a three-dimensional random mat composed of pitch-based short fibers with a basis weight of 250 g / m 2 .
- This three-dimensional random mat is heated from 170 ° C to 295 ° C in air at an average rate of 7 ° CZ. The temperature was raised and infusibilization was performed. An infusible 3D random mat was fired at 3,000 ° C.
- the average fiber diameter of the three-dimensional random mat-like carbon fiber aggregate after firing was 8/2 m, (value was 0.16.
- the fiber length was 30 mm on average.
- the crystallite size was 45 nm. Met.
- Kitakawa Seiki Co., Ltd. was set up using B 4032 AT made by Teijin Chemicals Co., Ltd. as the thermoplastic polyester elastomer resin, and the volume ratio of the three-dimensional random matte carbon fiber was set to 55%.
- press molding was carried out so that the thickness of the inner 650 mm mold was 0.5 mm.
- the measured thermal conductivity of the molded carbon fiber composite sheet was 15. OWZ (m. K). The flexibility was good.
- the carbon fiber composite sheet produced in Example 8 was placed on a 20 g weight heated to 70 ° C. and heated for 150 seconds to bring the temperature of the carbon fiber composite sheet to about 70 ° C. After that, when the weight was removed and the heat was released, it reached 20 ° C after 60 seconds. It was found that the heat dissipation effect was high.
- Example 12 instead of the carbon fiber composite sheet, a thermoplastic polyester elastomer resin alone was loaded with a 20 g weight heated to 70 ° C and heated for 150 seconds to bring the temperature of the thermoplastic polyester elastomer resin to about 70 ° C. After that, when the weight was removed and the heat was released, the temperature reached 50 ° C after 60 seconds, and the heat dissipation was worse than that of the carbon composite sheet.
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch had an optical anisotropy ratio of 100% and a softening point of 284 ° C.
- heated air was ejected from the slit at a linear velocity of 5,000 Om per minute to pull the melt pitch and produce pitch-based short fibers with an average diameter of 13 m. Produced.
- mat spun the short fibers were collected on a belt to obtain a mat-like pitch fibers having a basis weight of 250 gZm 2 in further cross lapping.
- the mat-like pitch fiber was infusibilized by raising the temperature from 170 ° C to 310 ° C in air at an average temperature rise rate of 5 minutes in Z minutes.
- the infusible mat-like pitch fibers were fired at 700 ° C, then shortened with a pulverizer, and then fired at 3,000 ° C to obtain pitch-based carbon fibers.
- the average fiber diameter of the pitch-based carbon fiber was 1 lm, and the CV value was 0.12.
- the average fiber length was 8 mm.
- the crystallite size derived from the growth direction of the hexagonal mesh plane was 46 nm.
- the thermal conductivity in the fiber axis direction was 590 W / (m-K).
- the true density of pitch-based carbon fiber is 2. lgZcc.
- the pitch-based carbon fiber sheet had a carbon content of 99% by weight, a thickness of 1.2 mm, and a porosity of 85% by volume.
- a maleic acid-modified polypropylene film manufactured by Sanyo Chemical Co., Ltd. was used as the matrix resin, and the pitch-based carbon fiber sheet was set as a reinforcing material so that the volume ratio of the molded product was 30%.
- Kitagawa Seiki Co., Ltd. Using a vacuum press machine, press molding was performed so that the inner diameter was 200 mm and the thickness was l mm. When the thermal conductivity in the thickness direction of the formed carbon fiber reinforced composite sheet was measured, it was 4.5 W / (m ⁇ K).
- a pitch made of a condensed polycyclic hydrocarbon compound was used as a main raw material.
- This pitch had an optical anisotropy ratio of 100% and a softening point of 284 ° C.
- hot air is ejected from the slit at a linear velocity of 5,000 m / min to produce a pitch short fiber with an average diameter of 13 zzm by pulling the melt pitch. did.
- the spun short fibers are collected on a belt to form a mat, and the weight is further increased by cross wrapping.
- a pine pitch fiber of 255 g / m 2 was obtained.
- This pine pitch fiber was infusibilized by raising the temperature from 170 ° C. to 305 ° C. in air at an average temperature increase rate of 5 ° C. Zmin. 700 ° C of infusible pine pitch fiber After that, the fiber was shortened with a powdering device and then further fired at 2,900 ° C to obtain pitch-based carbon fiber.
- the average fiber diameter of the pitch-based carbon fiber was 1 lm, and the CV value was 0.11.
- the average fiber length was 8 mm.
- the crystallite size derived from the growth direction of the hexagonal mesh plane was 42 nm.
- the thermal conductivity in the fiber axis direction was 510 W / (m ⁇ K).
- the true density of the pitch-based carbon fiber was 2. lgZc c.
- pitch-based carbon fiber 90 parts by weight of pitch-based carbon fiber and 10 parts by weight of polyethylene terephthalate fiber having an average fiber length of 10 mm as a binder were made, and then calendered at 280 ° C to obtain a pitch-based carbon fiber sheet.
- the pitch-based carbon fiber sheet had a carbon content of 90% by weight, a thickness of 1.2 mm, and a porosity of 70% by volume.
- a poly-strength Ponate (trade name: Panlite) film was used as the matrix resin, and the pitch-based carbon fiber reinforcement was set to a volume ratio of 35%. Kitakawa Seiki Co., Ltd. vacuum Using a press machine, press molding was performed so that the inner diameter was 200 mm and the thickness was 1 mm. When the thermal conductivity in the thickness direction of the molded carbon fiber reinforced composite sheet was measured, it was 4.3 W / (m-K).
- the optically anisotropic ratio of this pitch which mainly consists of a pitch made of a condensed polycyclic hydrocarbon compound, was 100%, and the softening point was 285 ° C.
- heated air is ejected from the slit at a linear velocity of 5,000 m / min, and the pitch is melted to pull pitch short fibers with an average diameter of 10 m.
- the spun fibers were collected on a belt to form a mat, and further, a pitch fiber mat having a three-dimensional random shape with a basis weight of 250 gZm 2 was obtained by cross wrapping.
- the pitch fiber mat was raised from 170 ° C to 295 ° C in air at an average temperature rise rate of 7 ° C for infusibilization.
- the infusible 3D random mat was fired at 800 ° C.
- the average fiber diameter of pitch-based carbon fibers constituting the pitch-based carbon fiber mat after firing was 9 m, and the CV value was 0.18.
- the average fiber length was 40 mm.
- the crystallite size derived from the growth direction of the hexagonal mesh plane was 3 nm. Fiber axial heat The conductivity was 35 WZ (m ⁇ K).
- pitch-based carbon fiber 70 parts by weight of pitch-based carbon fiber and 10 parts by weight of VA fiber (trade name: vinylon) having an average fiber length of 5 mm as a binder were made to obtain a pitch-based carbon fiber sheet.
- VA fiber trade name: vinylon
- the pitch-based carbon fiber sheet had a carbon content of 65% by weight, a thickness of 1.5 mm, and a porosity of 80% by volume.
- Example 1 the thermal conductivity in the thickness direction was measured using a maleic acid-modified polypropylene resin as a molded body without using a pitch-based carbon fiber sheet.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06732178A EP1876276A4 (en) | 2005-04-19 | 2006-04-14 | CARBON FIBER COMPOSITE SHEET, USE THEREOF AS HEAT TRANSFER ARTICLE AND SHEET FOR BRAI-BASED CARBON FIBER MAT FOR USE IN THE SAME |
CN2006800131798A CN101163828B (zh) | 2005-04-19 | 2006-04-14 | 碳纤维复合片材、其传热体用途及其中所使用的沥青类碳纤维毡用片 |
US11/912,086 US20090061193A1 (en) | 2005-04-19 | 2006-04-14 | Carbon fiber composite sheet, use thereof as a heat conductor and pitch-based carbon fiber web sheet for use in the same |
JP2007528199A JP4576430B2 (ja) | 2005-04-19 | 2006-04-14 | 炭素繊維複合シート、その伝熱体用途およびそれに用いるピッチ系炭素繊維マット用シート |
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JP2008208316A (ja) * | 2007-02-28 | 2008-09-11 | Teijin Ltd | 炭素繊維複合材料 |
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JP2009030189A (ja) * | 2007-07-25 | 2009-02-12 | Teijin Ltd | 炭素繊維およびその製造方法 |
JP2009132810A (ja) * | 2007-11-30 | 2009-06-18 | Teijin Ltd | シート状熱伝導性成形体 |
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JP2011021303A (ja) * | 2009-07-17 | 2011-02-03 | Mitsubishi Plastics Inc | 炭素繊維不織布、炭素繊維強化樹脂シートおよび炭素繊維強化樹脂成形体 |
JP2011129625A (ja) * | 2009-12-16 | 2011-06-30 | Toppan Printing Co Ltd | 電子機器筐体用の樹脂材料および電子機器筐体 |
JPWO2012029696A1 (ja) * | 2010-09-03 | 2013-10-28 | 旭有機材工業株式会社 | シート材及びその製造方法 |
JP5992684B2 (ja) * | 2010-09-03 | 2016-09-14 | 旭有機材株式会社 | シート材及びその製造方法 |
JP2014196584A (ja) * | 2013-03-29 | 2014-10-16 | トヨタ自動車株式会社 | 不織布の製造方法および複合材料の製造方法 |
JP2016108688A (ja) * | 2014-12-04 | 2016-06-20 | 大阪ガスケミカル株式会社 | 断熱材用炭素繊維及びそれを用いた断熱材 |
JP2017007234A (ja) * | 2015-06-23 | 2017-01-12 | 日本ゼオン株式会社 | 熱伝導シートおよびその製造方法 |
JP2019508292A (ja) * | 2016-02-19 | 2019-03-28 | カーボン コンバージョンズ インコーポレイテッド | 熱可塑性結合したプレフォーム及びそれを用いて形成された熱硬化性マトリクス |
Also Published As
Publication number | Publication date |
---|---|
EP1876276A4 (en) | 2011-02-23 |
JP4576430B2 (ja) | 2010-11-10 |
CN101163828A (zh) | 2008-04-16 |
US20090061193A1 (en) | 2009-03-05 |
EP1876276A1 (en) | 2008-01-09 |
JPWO2006112516A1 (ja) | 2008-12-11 |
KR20070121773A (ko) | 2007-12-27 |
CN101163828B (zh) | 2011-06-08 |
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