WO2013179891A1 - 炭素繊維複合材料 - Google Patents
炭素繊維複合材料 Download PDFInfo
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- WO2013179891A1 WO2013179891A1 PCT/JP2013/063520 JP2013063520W WO2013179891A1 WO 2013179891 A1 WO2013179891 A1 WO 2013179891A1 JP 2013063520 W JP2013063520 W JP 2013063520W WO 2013179891 A1 WO2013179891 A1 WO 2013179891A1
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- sheet
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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
-
- 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
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/05—5 or more layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/07—Parts immersed or impregnated in a matrix
- B32B2305/076—Prepregs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/22—Fibres of short length
- B32B2305/28—Fibres of short length in the form of a mat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
-
- 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
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/22—Thermoplastic resins
-
- 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
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
Definitions
- the present invention relates to a carbon fiber composite material, and more particularly, to a carbon fiber composite material capable of producing a molded article having excellent formability and high mechanical characteristics even with a complicated shape.
- a sheet-like carbon fiber composite material is used as a molding material, and the carbon fiber composite material is pressed into a predetermined shape under a predetermined temperature and pressure condition.
- a technique for forming (stamping) is known.
- carbon as a molding material is formed so as to be molded in a desired carbon fiber reinforced form over all parts of the complex shape.
- High fluidity is required for fiber composite materials.
- the fluidity of the carbon fiber composite material is low, not only good moldability cannot be obtained, but the mechanical properties of the molded product may be lowered, and the variation in mechanical properties may be increased.
- Patent Document 1 discloses a carbon fiber sheet excellent in tensile strength, in which a carbon fiber nonwoven fabric and a carbon fiber spread body are entangled and laminated with a needle punch or a water jet. Even when used as a carbon fiber composite material as a molding material as described above, the fluidity at the time of molding was low due to strong entanglement between fibers.
- inorganic fibers (glass fiber, carbon fiber, etc.) are bundled with natural polymer, and the bundle of bundled fibers is bound with a binder (thermoplastic resin, thermosetting resin, elastomer, etc.).
- a fiber reinforced plastic reinforcing material having excellent tensile strength is disclosed, the fibers are bonded to each other with a binder, so that the fluidity during molding is low.
- a natural polymer such as starch is used as a sizing agent, the sizing agent deteriorates when impregnated with a thermoplastic resin to form a composite material, and it is difficult to obtain a molded article having high physical properties.
- Patent Document 3 discloses a carbon fiber sheet having a high level of flatness and a high tensile strength, in which carbon fiber felt and carbon fiber paper are laminated. Such a sheet is used as a carbon fiber composite material. Even so, although the carbon fiber paper part has high dispersibility of the single fiber of carbon fiber, the carbon fiber is entangled with each other, so that the fluidity during molding is low.
- the object of the present invention is a carbon fiber composite material that can exhibit high fluidity at the time of molding, which has not been achieved with conventional carbon fiber composite materials, has good mechanical properties of molded products, and has few variations in mechanical properties. Is to provide.
- the carbon fiber composite material according to the present invention has a work amount per unit weight in a tensile test using a test piece having a width of 25 mm of 1 ⁇ 10 ⁇ 3 to 30 ⁇ 10 ⁇ 3 [(N ⁇ mm ) / (G / m 2 )] as a reinforcing material and a thermoplastic resin as a matrix resin.
- a preferable range of the work amount per unit weight is 1 ⁇ 10 ⁇ 3 to 25 ⁇ 10 ⁇ 3 [(N ⁇ mm) / (g / m 2 )], more preferably 1 ⁇ 10 ⁇ 3 to 14 ⁇ 10 ⁇ .
- the work amount per unit weight of the carbon fiber sheet is a load-strain curve (hereinafter referred to as “tensile curve”) obtained by the tensile test as described later.
- tensile curve a load-strain curve obtained by the tensile test as described later.
- a carbon fiber composite material composed of the carbon fiber sheet and matrix resin is used as a molding material, and the target molded product is molded, the fluidity of the molding material is improved and excellent moldability is realized. .
- a load [N / (g / m 2 )] ⁇ 10 ⁇ 3 ⁇ strain [%] curve obtained by the tensile test of the carbon fiber sheet after reaching the maximum load.
- the slope is preferably in the range of -0.1 to -0.01. As will be described later, this slope is the slope of the tensile curve when it reaches 4 to 6% after reaching the maximum load per unit weight in the tensile test. Calculated as the slope.
- the slope of the carbon fiber sheet after initial load application in the load [N / (g / m 2 )] ⁇ 10 ⁇ 3 ⁇ strain [%] curve obtained by the tensile test is 0.1 to 0.7. It is preferable to be in the range. As will be described later, this inclination is the inclination of the initial rising of the tensile curve when a load per unit weight is applied in a tensile test. The smaller the inclination, the weaker the carbon fiber sheet is stretched. Therefore, the resistance at which the carbon fiber composite material starts to flow is reduced, and a molded product can be formed with high fluidity.
- a more preferable range of the slope at the initial load is 0.1 to 0.5, and a more preferable range is 0.1 to 0.3.
- the fiber length of the carbon fiber forming the carbon fiber sheet is preferably in the range of 5 to 30 mm.
- the fiber length of the carbon fiber forming the carbon fiber sheet is preferably in the range of 5 to 30 mm.
- the carbon fiber sheet is formed using a sheet-like carbon fiber aggregate formed from a carbon fiber bundle and a thermoplastic resin short fiber cut to a predetermined length as a starting material.
- the form which consists of what was made can be mentioned. In such a form, it can be easily suppressed that the entanglement between the carbon fibers in the carbon fiber composite material according to the present invention becomes too strong, thereby reliably defining the work amount per unit weight of the carbon fiber sheet in the present invention. Within the range.
- the ratio Y of the carbon fiber bundle (1) having Mn / (Ln ⁇ D) of 8.5 ⁇ ⁇ 1 (mg / mm 2 ) or more to the total weight of the carbon fibers is 30 ⁇ Y ⁇ 90 ( wt%), and the average value X of Mn / Ln of the carbon fiber bundle (1) is in the range of 1.1 ⁇ 10 ⁇ 2 ⁇ X ⁇ 8.1 ⁇ 10 ⁇ 2 (mg / mm), It is preferable that Y satisfies Y ⁇ 100X + 30.
- Mn Carbon fiber bundle weight
- Ln Carbon fiber fiber fiber length
- D Carbon fiber fiber diameter
- the carbon fiber bundle in a carbon fiber sheet is the quantity average x of the number of the carbon fibers which comprise the carbon fiber bundle (3) whose number of the carbon fibers which comprise a carbon fiber bundle is 90 or more. Is preferably in the range of 90 to 1,000. From the viewpoint of improving the strength utilization rate of carbon fibers, which will be described later, and from the viewpoint of the surface appearance of the molded product when made into a carbon fiber composite material, the number average x of the number of carbon fibers constituting the bundle is in the range of 90 to 600. More preferably, it is in the range of 90 to 500.
- the number average x is more preferably in the range of 300 to 1,000, more preferably 500 to 1,000. is there.
- the number average x of the carbon fiber bundles is less than 90, the number of entanglements between the fibers increases and the fluidity deteriorates. If it exceeds 1000, the mechanical properties and the ability to follow carbon fibers to fine parts such as ribs will deteriorate, and the variation in mechanical properties will increase.
- the standard deviation ⁇ of the number xn of carbon fibers constituting the carbon fiber bundle (3) in the carbon fiber sheet is preferably in the range of 50 ⁇ ⁇ ⁇ 500, and the carbon fiber bundle is dispersed in the carbon fiber sheet.
- a carbon fiber nonwoven fabric that can achieve both high fluidity and mechanical properties, has little variation in mechanical properties, and has excellent carbon fiber followability to fine parts can be obtained.
- the standard deviation ⁇ is more preferably in the range of 100 ⁇ ⁇ ⁇ 350, still more preferably in the range of 150 ⁇ ⁇ ⁇ 350, and still more preferably in the range of 150 ⁇ ⁇ ⁇ 300.
- the carbon fiber bundle is preferably made of a sizing agent attached.
- the sizing agent By applying the sizing agent, the carbon fiber bundle cut into a predetermined length forming the carbon fiber sheet can be appropriately maintained in the form of the fiber bundle without the carbon fiber greatly separating. Therefore, it is more reliably suppressed that the entanglement between the carbon fibers in the carbon fiber composite material according to the present invention becomes too strong, whereby the work amount per unit weight of the carbon fiber sheet is more reliably defined in the present invention. It can be stored inside.
- the carbon fiber composite material according to the present invention when the carbon fiber composite material is press-molded using the carbon fiber composite material as a molding material, high fluidity is expressed. It can be expressed by a flow rate represented by a ratio of an area after pressurization to an area before pressurization when pressurization is performed under a predetermined temperature and pressure condition as described later. In the present invention, the fluidity is preferably 170% or more as in the examples described later.
- the present invention also provides a carbon fiber reinforced plastic obtained by press molding (for example, stamping molding) the carbon fiber composite material according to the present invention as described above. Even if the carbon fiber reinforced plastic as a molded product has a complicated shape, the carbon fiber composite material exhibits high fluidity at the time of molding as described above. As a result, the mechanical properties of the molded article can be achieved, and variations in the mechanical properties can be reduced.
- the fluidity at the time of molding is excellent, and excellent moldability is obtained even when molding into a complicated shape, and the mechanical properties of the molded product are high.
- the carbon fiber composite material according to the present invention has a work amount per unit weight of 1 ⁇ 10 ⁇ 3 to 30 ⁇ 10 ⁇ 3 [(N ⁇ mm) / (g / m 2 ) in a tensile test using a test piece having a width of 15 mm.
- the carbon fiber sheet is a reinforcing material and the thermoplastic resin is a matrix resin.
- the carbon fiber composite material according to the present invention is specified by a load obtained by the tensile test of the carbon fiber sheet.
- the [N / (g / m 2 )] ⁇ 10 ⁇ 3 ⁇ strain [%] curve plays a major role.
- the flow rate represented by the ratio of the area after pressurization to the area before pressurization when pressurized under a predetermined temperature and pressure condition plays a big role.
- D is the carbon fiber diameter
- F is the single yarn fineness of the carbon fiber
- xn is the number of constituent single yarns of the carbon fiber bundle.
- Mn / the (Ln ⁇ D) value 8.5 ⁇ 10 -1 mg / mm 2 or more fiber bundles of the carbon fiber bundle (1), the total weight of the carbon fiber bundle (1) and M A, flux Total N is measured. Further, the carbon fiber bundle under 8.5 ⁇ 10 -1 mg / mm 2 and the fiber bundle (2), the total weight of the carbon fiber bundle (2) as M B, measured. Fiber bundles opened to such an extent that they cannot be extracted with tweezers were collectively measured and finally weighed. Further, when the fiber length is short and it becomes difficult to measure the weight, the fiber length is classified at intervals of about 0.2 mm, the weight is measured for a bundle of a plurality of classified bundles, and an average value may be used. .
- the ratio of the carbon fiber bundle (1) to the total weight of the carbon fiber bundle is M A / (M A + M B) ⁇ 100 Sought by.
- construction single yarn number x n of the carbon fiber bundle is a carbon fiber bundle over 90 present as a carbon fiber bundle (3), the total weight as M 1, a bundle total number as N, measured. Further, the carbon fiber bundle under construction single yarn number x n is 90 present as fiber bundles (4), the total weight of the carbon fiber bundles (4) M 2, is measured. The fiber bundles opened to such an extent that they cannot be extracted with tweezers were collectively measured and finally weighed. Further, when the fiber length is short and it becomes difficult to measure the weight, the fiber length is classified at intervals of about 0.2 mm, the weight is measured for a bundle of a plurality of classified bundles, and an average value may be used. .
- N is the total number of bundles of carbon fiber bundles (3).
- the ratio of the carbon fiber bundle (3) to the total weight of the carbon fiber bundle is M 1 / (M 1+ M 2 ) ⁇ 100 Sought by.
- a carding apparatus 1 for carding a carbon fiber bundle includes a cylinder roll 2 and a take-in roll provided on the upstream side in the vicinity of the outer peripheral surface thereof. 3 and a doffer roll 4 provided close to the outer peripheral surface of the cylinder roll 2 on the downstream side opposite to the take-in roll 3, and a cylinder roll 2 between the take-in roll 3 and the doffer roll 4
- a carbon fiber bundle 9 cut to a predetermined length is supplied to the belt conveyor 8, and the carbon fiber bundle 9 is introduced onto the outer peripheral surface of the cylinder roll 2 through the outer peripheral surface of the feed roll and then the outer peripheral surface of the take-in roll 3.
- the Up to this stage, the carbon fiber bundles have been solved to some extent to form an aggregate of carbon-like carbon fiber bundles (carbon fiber aggregate).
- a part of the aggregate of cotton-like carbon fiber bundles introduced on the outer peripheral surface of the cylinder roll 2 is wound around the outer peripheral surface of the worker roll 5, and this carbon fiber is peeled off by the stripper roll 6 and again the cylinder roll. 2 is returned to the outer peripheral surface.
- a large number of needles and protrusions are present on the outer peripheral surface of each of the feed roll 7, the take-up roll 3, the cylinder roll 2, the worker roll 5 and the stripper roll 6, and the carbon fiber is
- the bundle is opened to a predetermined bundle by the action of the needle and oriented to some extent.
- the fiber bundle is opened to a predetermined carbon fiber bundle, and moves on the outer peripheral surface of the doffer roll 4 as a sheet-like web 10 which is one form of the carbon fiber aggregate.
- Airlaid is a method for producing a nonwoven sheet of short fibers.
- General airlaid methods include the Honshu Paper Manufacturing Method, Cloyer Method, Dunweb Method, J & J Method, KC Method, Scott Method, etc. reference).
- the airlaid device 11 includes a cylindrical drum 12 having a fine hole that rotates in reverse to each other and a pin cylinder 13 installed in each drum 12, and a carbon fiber together with a large amount of air.
- a single bundle or a carbon fiber bundle and a thermoplastic resin fiber are blown to the drum 12, opened by the pin cylinder 13 in the drum 12, discharged from the pores, and dropped onto the wire 14 that travels thereunder.
- air used for air blowing is sucked into a suction box 15 installed under the wire 14, and the opened carbon fiber bundle alone or the opened carbon fiber bundle and the thermoplastic resin fiber remains on the wire 4.
- Carbon fiber bundle (C) Carbon fiber in which 1.0% by weight of a sizing agent mainly composed of bisphenol A ethylene oxide adduct is attached to a carbon fiber bundle with a continuous carbon fiber bundle having a fiber diameter of 7 ⁇ m, a tensile modulus of 230 GPa, and a filament number of 12,000. A bundle (C) was obtained.
- Carbon fiber bundle (D) A carbon fiber bundle (D) was obtained without applying a sizing agent to a continuous carbon fiber bundle having a fiber diameter of 7 ⁇ m, a tensile modulus of 230 GPa, and a filament number of 12,000.
- the winding direction of the sheet-like carbon fiber aggregate is 0 °, and 12 carbon fiber aggregates are laminated so as to be (0 ° / 90 ° / 0 ° / 90 ° / 0 ° / 90 °) s.
- 12 carbon fiber aggregates are laminated so as to be (0 ° / 90 ° / 0 ° / 90 ° / 0 ° / 90 °) s.
- CM1001 nylon resin melt blown nonwoven fabric
- resin viscosity ⁇ r 2.3, manufactured by Toray Industries, Inc.
- the flat plate of the carbon fiber composite material of thickness 2mm When the flow test of the obtained flat plate was carried out, the fluidity was 230% and the fluidity was excellent.
- the work load was 3.5 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.018, and the initial load inclination was 0.15.
- the number average x of the number of carbon fibers constituting the bundle was 375, and the standard deviation ⁇ was 192.
- Example 3 The carbon fiber bundle (C) was cut to a fiber length of 15 mm, and the cut carbon fiber bundle and the same nylon 6 short fiber as in Example 1 were put into the carding apparatus in the same manner as in Example 1, cross-wrapped and sheeted A carbon fiber aggregate was formed.
- the obtained sheet-like carbon fiber aggregate and nylon resin meltblown nonwoven fabric were laminated in the same manner as in Example 1, and further hot-pressed in the same manner as in Example 1 to cool and flat plate of carbon fiber composite material having a thickness of 2 mm. Got. When the flow test of the obtained flat plate was carried out, the fluidity was 203% and the fluidity was excellent.
- the work amount was 12.1 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.062, and the initial load inclination was 0.61. Further, the number average x of the number of carbon fibers constituting the bundle was 167, and the standard deviation ⁇ was 63.
- Example 4 The carbon fiber bundle (C) was cut to a fiber length of 25 mm, and the cut carbon fiber bundle and the same nylon 6 short fiber as in Example 1 were put into the carding apparatus in the same manner as in Example 1, cross-wrapped and sheeted A carbon fiber aggregate was formed.
- the obtained sheet-like carbon fiber aggregates were laminated in the same manner as in Example 1. Further, a nylon resin meltblown nonwoven fabric was laminated so that the volume ratio of carbon fibers to the thermoplastic resin was 27:73.
- the plate was cooled after being hot pressed to obtain a carbon fiber composite material flat plate having a thickness of 2 mm. When the flow test of the obtained flat plate was carried out, the fluidity was 185% and the fluidity was excellent.
- the work amount was 22.1 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.035, and the initial load inclination was 0.46. Further, the number average x of the number of carbon fibers constituting the bundle was 151, and the standard deviation ⁇ was 59.
- Example 5 The carbon fiber bundle (C) was cut to a fiber length of 50 mm, and the cut carbon fiber bundle and the same nylon 6 short fiber as in Example 1 were used and placed in the carding apparatus in the same manner as in Example 1, cross-wrapped and sheeted A carbon fiber aggregate was formed.
- the obtained sheet-like carbon fiber aggregates were laminated in the same manner as in Example 1. Further, the nylon resin meltblown nonwoven fabric was laminated so that the volume ratio of carbon fibers to the thermoplastic resin was 30:70.
- the plate was cooled after being hot pressed to obtain a carbon fiber composite material flat plate having a thickness of 2 mm. When the flow test of the obtained flat plate was carried out, the fluidity was 172%, which was excellent in fluidity.
- the work load was 28.2 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.022, and the initial load inclination was 0.34.
- the number average x of the number of carbon fibers constituting the bundle was 141, and the standard deviation ⁇ was 54.
- the winding direction of the sheet-like carbon fiber aggregate is 0 °, and 12 carbon fiber aggregates are laminated so as to be (0 ° / 90 ° / 0 ° / 90 ° / 0 ° / 90 °) s.
- 12 carbon fiber aggregates are laminated so as to be (0 ° / 90 ° / 0 ° / 90 ° / 0 ° / 90 °) s.
- the whole is a stainless steel plate.
- hot pressing was performed at 240 ° C. for 180 seconds while applying a pressure of 2.0 MPa.
- the flat plate of the carbon fiber composite material of thickness 2mm When the flow test of the obtained flat plate was carried out, the fluidity was 207% and the fluidity was excellent. Further, when a tensile test was performed on a carbon fiber mat obtained by heating the flat plate in an electric furnace heated to 500 ° C. for 1 hour to burn off organic substances such as a matrix resin, the work load was 18.1 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.031, and the initial load inclination was 0.38. The number average x of the number of carbon fibers constituting the bundle was 394, and the standard deviation ⁇ was 202.
- Example 7 The carbon fiber bundle (E) was cut to a fiber length of 15 mm, and the cut carbon fiber bundle and polyamide (nylon 6) short fibers (long fibers having a single fiber fineness of 1.7 dtex and a cut length of 5 mm) were used in a mass ratio of 90.
- the winding direction of the sheet-like carbon fiber aggregate is 0 °, and 12 carbon fiber aggregates are laminated so as to be (0 ° / 90 ° / 0 ° / 90 ° / 0 ° / 90 °) s.
- a nylon 610 resin film (“CM2001” manufactured by Toray Industries, Inc.) so that the volume ratio of carbon fiber to thermoplastic resin is 25:75
- the whole is sandwiched between stainless plates and is heated at 240 ° C. for 90 seconds.
- hot pressing was performed at 240 ° C. for 180 seconds while applying a pressure of 1.0 MPa.
- the flat plate of the carbon fiber composite material of thickness 2mm When the flow test of the obtained flat plate was carried out, the fluidity was 298% and the fluidity was excellent. Further, when a tensile test was performed on a carbon fiber mat obtained by heating the flat plate in an electric furnace heated to 500 ° C. for 1 hour to burn off organic substances such as a matrix resin, the work amount was 2.9 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.016, and the initial load inclination was 0.16. The number average x of the number of carbon fibers constituting the bundle was 382, and the standard deviation ⁇ was 303.
- Example 8 A carbon fiber composite material flat plate having a thickness of 2 mm was obtained in the same manner as in Example 7 except that the carbon fiber bundle (E) was cut to a fiber length of 25 mm.
- the fluidity was 276% and the fluidity was excellent.
- the work amount was 4.2 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.025, and the initial load inclination was 0.19.
- the number average x of the number of carbon fibers constituting the bundle was 423, and the standard deviation ⁇ was 379.
- the carbon fiber bundle (A) is cut to a fiber length of 45 mm, the cut carbon fiber bundle and the polypropylene short fiber are mixed in the same manner as in Example 6, carded and cross-wrapped, and the basis weight made of carbon fiber and polypropylene fiber A sheet-like carbon fiber aggregate of 100 g / m 2 was formed. After laminating the sheet-like carbon fiber aggregates in the same manner as in Example 6 and further laminating the polypropylene resin meltblown nonwoven fabric so that the volume ratio of carbon fibers to the thermoplastic resin is 40:60, the same as in Example 6. Hot press and cooling were performed to obtain a carbon fiber composite material flat plate having a thickness of 2 mm.
- the fluidity was 160%, which was inferior in fluidity.
- the work load was 36.2 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.008, and the initial load inclination was 0.81.
- the number average x of the number of carbon fibers constituting the bundle was 446, and the standard deviation ⁇ was 402.
- Example 2 The carbon fiber bundle (D) is cut to a fiber length of 15 mm, and the cut carbon fiber bundle and the same nylon 6 short fiber as in Example 1 are used and placed in the carding apparatus in the same manner as in Example 1, and then cross-wrapped and sheet A carbon fiber aggregate was formed.
- the obtained sheet-like carbon fiber aggregate and nylon resin meltblown nonwoven fabric were laminated in the same manner as in Example 1, and further hot-pressed in the same manner as in Example 1 to cool and flat plate of carbon fiber composite material having a thickness of 2 mm. Got. When the flow test of the obtained flat plate was carried out, the fluidity was 165%, which was inferior in fluidity.
- the work amount was 30.2 ⁇ 10 ⁇ . 3 [(N ⁇ mm) / (g / m 2 )], the inclination after reaching the maximum load was -0.12, and the initial load inclination was 0.68. Further, the number average x of the number of carbon fibers constituting the bundle was 512, and the standard deviation ⁇ was 360.
- FIG. 6 shows load-strain curves representing the results of Examples 1 to 3 and Comparative Example 1 described above. As shown in FIG. 6, it can be seen that in Examples 1 to 3, the target characteristics of the present invention are obtained as compared with Comparative Example 1. Table 1 summarizes the results of the above Examples and Comparative Examples.
- the present invention is particularly suitable for an application in which molding into a relatively complicated shape is performed by press molding of a carbon fiber composite material.
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Abstract
Description
ここで、
Mn:炭素繊維束重量
Ln:炭素繊維の繊維長
D:炭素繊維の繊維径
本発明に係る炭素繊維複合材料は、幅15mmの試験片での引張試験における目付あたりの仕事量が1×10-3~30×10-3[(N・mm)/(g/m2)]である炭素繊維シートを補強材とし、熱可塑性樹脂をマトリックス樹脂とするものであるが、この本発明に係る炭素繊維複合材料の特定には、上記炭素繊維シートの上記引張試験で得られる荷重[N/(g/m2)]×10-3―ひずみ[%]曲線が大きな役割を果たす。また、この本発明に係る炭素繊維複合材料の性能の評価には、所定の温度、圧力条件で加圧したときの、加圧前の面積に対する加圧後の面積の比率で表される流動率が大きな役割を果たす。さらに、前述したように、本発明に係る炭素繊維複合材料では、炭素繊維シートを形成する炭素繊維を、極力、特定の炭素繊維束の形態でかつ特定の条件で残しておくことが好ましく、その炭素繊維束の測定も重要な役割を果たす。したがって、まず、これらについて説明する。
実施例および比較例で得られた炭素繊維複合材料の平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばした。得られた炭素繊維マットを幅25mm、長さ250mmに0°方向および90°方向にそれぞれ5点切り出し試験片を得た。得られた試験片をJIS-L-1096-8.14.1-A法(ストリップ法)(2010)に従って、それぞれの試験片5点についてつかみ間隔100mmで定速伸長型引張試験器を用いて、引張速度100mm/分で伸長させた。得られた結果を単純平均して0°方向、90°方向の荷重[N/(g/m2)]×10-3―ひずみ[%]曲線である引張曲線をそれぞれ作成した。引張曲線の例を図1、図2に示す。
上記のように得られた引張曲線の値を積分する(図1、図2における縦軸(目付当たりの荷重)および横軸(ひずみ)の尺度で表される特性曲線と横軸で囲まれた部分の面積を求めることに相当)ことにより仕事量が求めることができ、0°方向および90°方向の仕事量をそれぞれ求めて、得られた仕事量を単純平均した。上記囲まれた部分の面積が小さいほど、炭素繊維シートを引き伸ばすのに必要なエネルギーが小さくて済み、炭素繊維複合材料としての流動性が高い。
上記の引張曲線において、図1に示すように、最大荷重に到達後、さらに4%~6%伸長させた区間の傾きを求めた。図2に示すように、この傾きが緩やかなほど、流動性が高く、流動後の炭素繊維体積含有率のばらつきが小さい。
上記の引張曲線において、図1に示すように、初期の荷重負荷時から2%~5%伸長させた区間の傾きを求めた。図2に示すように、この傾きが緩やかなほど、流動初期に流れやすい。
[マトリックス樹脂がポリアミドの場合]
図3に示すように、寸法100×100mm×2mmの炭素繊維複合材料101を2枚260℃に予熱後、2枚重ねて120℃に昇温したプレス盤102に配し、20MPaで5秒間加圧し、流動させて成形した。このプレス成形後の炭素繊維強化プラスチック103の圧縮後(流動後)の面積A2と圧縮前(流動前)のシートの面積A1を測定し、A2/A1を流動率(%)として流動性の評価に用いた。
上記と同様に、寸法100×100mm×2mmの炭素繊維複合材料を2枚230℃に予熱後、2枚重ねて80℃に昇温したプレス盤に配し、20MPaで5秒間加圧した。この圧縮後の面積A2と圧縮前のシートの面積A1を測定し、A2/A1を流動率(%)とした。
上記の流動試験後の炭素繊維複合材料プレス成形品から約2gのサンプルを切り出し、その質量を測定した。その後、サンプルを500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばした。室温まで冷却してから、残った炭素繊維の質量を測定した。炭素繊維の質量に対する、マトリックス樹脂等の有機物を焼き飛ばす前のサンプルの質量に対する比率を測定し、炭素繊維の含有率とした。
炭素繊維複合材料から100mm×100mmのサンプルを切り出し、その後、サンプルを500℃に加熱した電気炉の中で1時間程度加熱してマトリックス樹脂等の有機物を焼き飛ばした。室温まで冷却した後に残った炭素繊維集合体の質量を測定した後に、炭素繊維集合体から炭素繊維束をピンセットで全て抽出した。抽出した全ての炭素繊維束について、1/10000gまで測定が可能な天秤を用いて、個々の炭素繊維束の重量Mnと長さLnを測定する。測定後、個々の束に対してMn/Ln、Mn/(Ln×D)、炭素繊維束を構成する炭素繊維単糸本数xn=Mn/(Ln×F)を計算する。ここでDとは炭素繊維直径であり、Fとは炭素繊維の単糸繊度であり、xnは炭素繊維束の構成単糸本数である。
MA/(MA+MB)×100
によって求められる。
M1/(M1+M2)×100
によって求められる。
炭素繊維束(A)
繊維径5.5μm、引張弾性率294GPa、フィラメント数24000本の連続した炭素繊維束に対し、ポリエチレングリコールジグリシジルエーテル100%成分(分子量=670)の水系サイジング剤を炭素繊維束に1.0重量%付着させた炭素繊維束(A)を得た。
繊維径7μm、引張弾性率230GPa、フィラメント数12000本の連続した炭素繊維束に対し、ビスフェノールA型エポキシ樹脂40%成分(分子量=370)と不飽和物エステル樹脂として、ビスフェノールA型エチレンオキサイドマレイン酸エステル40%成分(分子量=2500)、乳化剤20%を主成分にしたサイジング剤を炭素繊維束に1.0重量%付着させた炭素繊維束(B)を得た。
繊維径7μm、引張弾性率230GPa、フィラメント数12000本の連続した炭素繊維束に対し、ビスフェノールAエチレンオキサイド付加物を主成分にしたサイジング剤を炭素繊維束に1.0重量%付着させた炭素繊維束(C)を得た。
繊維径7μm、引張弾性率230GPa、フィラメント数12000本の連続した炭素繊維束に対し、サイジング剤を付与せず炭素繊維束(D)を得た。
繊維径7μm、引張弾性率230GPa、フィラメント数24000本の連続した炭素繊維束に対し、グリセロールトリグリシジルエーテルをジメチルホルムアミド(以下、DMFと略す)で希釈した溶剤系サイジング剤を炭素繊維束に0.5重量%付着させた炭素繊維束(E)を得た。
炭素繊維束(A)を繊維長15mmにカットし、カットした炭素繊維束とポリアミド(ナイロン6)短繊維(単繊維繊度1.7dtex、カット長51mm、捲縮数12山/25mm、捲縮率15%)を質量比で90:10の割合で混合し、図4に示したようなカーディング装置に投入した。出てきたウェブをクロスラップし、炭素繊維とナイロン6繊維とからなる目付100g/m2のシート状の炭素繊維集合体を形成した。シート状の炭素繊維集合体の巻取り方向を0°とし、炭素繊維集合体を12枚、(0°/90°/0°/90°/0°/90°)sとなるように積層し、炭素繊維と熱可塑性樹脂の体積比が25:75となるようにナイロン樹脂メルトブロー不織布(「CM1001」、樹脂粘度ηr=2.3、東レ(株)製)をさらに積層した後に、全体をステンレス板で挟み、240℃で90秒間予熱後、2.0MPaの圧力をかけながら180秒間、240℃にてホットプレスした。ついで、加圧状態で50℃まで冷却し、厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は230%と流動性に優れるものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が3.5×10-3[(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.018、初期荷重傾きが0.15であった。また、束を構成する炭素繊維本数の数量平均xは375本、標準偏差σは192であった。
炭素繊維束(B)を繊維長15mmにカットし、カットした炭素繊維束と実施例1と同じナイロン6短繊維を用いて実施例1と同様にカーディング装置に投入し、クロスラップしてシート状の炭素繊維集合体を形成した。得られたシート状の炭素繊維集合体とナイロン樹脂メルトブロー不織布を実施例1と同様にして積層し、さらに実施例1と同様にホットプレスした後に冷却し、厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は217%と流動性に優れるものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が8.4×10-3 [(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.028、初期荷重傾きが0.43であった。また、束を構成する炭素繊維本数の数量平均xは336本、標準偏差σは245であった。
炭素繊維束(C)を繊維長15mmにカットし、カットした炭素繊維束と実施例1と同じナイロン6短繊維を用いて実施例1と同様にカーディング装置に投入し、クロスラップしてシート状の炭素繊維集合体を形成した。得られたシート状の炭素繊維集合体とナイロン樹脂メルトブロー不織布を実施例1と同様にして積層し、さらに実施例1と同様にホットプレスした後に冷却し、厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は203%と流動性に優れるものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が12.1×10-3 [(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.062、初期荷重傾きが0.61であった。また、束を構成する炭素繊維本数の数量平均xは167本、標準偏差σは63であった。
炭素繊維束(C)を繊維長25mmにカットし、カットした炭素繊維束と実施例1と同じナイロン6短繊維を用いて実施例1と同様にカーディング装置に投入し、クロスラップしてシート状の炭素繊維集合体を形成した。得られたシート状の炭素繊維集合体を実施例1と同様に積層し、さらにナイロン樹脂メルトブロー不織布を炭素繊維と熱可塑性樹脂の体積比が27:73となるように積層した後に、実施例1と同様にホットプレスした後に冷却し、厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は185%と流動性に優れるものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が22.1×10-3 [(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.035、初期荷重傾きが0.46であった。また、束を構成する炭素繊維本数の数量平均xは151本、標準偏差σは59であった。
炭素繊維束(C)を繊維長50mmにカットし、カットした炭素繊維束と実施例1と同じナイロン6短繊維を用いて実施例1と同様にカーディング装置に投入し、クロスラップしてシート状の炭素繊維集合体を形成した。得られたシート状の炭素繊維集合体を実施例1と同様に積層し、さらにナイロン樹脂メルトブロー不織布を炭素繊維と熱可塑性樹脂の体積比が30:70となるように積層した後に、実施例1と同様にホットプレスした後に冷却し、厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は172%と流動性に優れるものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が28.2×10-3 [(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.022、初期荷重傾きが0.34であった。また、束を構成する炭素繊維本数の数量平均xは141本、標準偏差σは54であった。
炭素繊維束(A)を繊維長10mmにカットし、カットした炭素繊維束とポリプロピレン短繊維(単繊維繊度1.7dtex、カット長51mm、捲縮数12山/25mm、捲縮率17%)を質量比で90:10の割合で混合し、カーディング装置に投入した。出てきたウェブをクロスラップし、炭素繊維とポリプロピレン繊維とからなる目付100g/m2のシート状の炭素繊維集合体を形成した。シート状の炭素繊維集合体の巻取り方向を0°とし、炭素繊維集合体を12枚、(0°/90°/0°/90°/0°/90°)sとなるように積層し、炭素繊維と熱可塑性樹脂の体積比が35:65となるようにポリプロピレン樹脂メルトブロー不織布(「J1709QG」、MFR=55g/10min、プライムポリマー(株)製)をさらに積層した後に、全体をステンレス板で挟み、240℃で90秒間予熱後、2.0MPaの圧力をかけながら180秒間、240℃にてホットプレスした。ついで、加圧状態で50℃まで冷却し、厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は207%と流動性に優れるものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が18.1×10-3 [(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.031、初期荷重傾きが0.38であった。また、束を構成する炭素繊維本数の数量平均xは394本、標準偏差σは202であった。
炭素繊維束(E)を繊維長15mmにカットし、カットした炭素繊維束とポリアミド(ナイロン6)短繊維(単繊維繊度1.7dtexの長繊維をカット長5mmとしたもの)を質量比で90:10の割合で混合し、図5に示したようなエアレイド装置に投入し、炭素繊維とナイロン6繊維とからなる目付100g/m2のシート状の炭素繊維集合体を形成した。シート状の炭素繊維集合体の巻取り方向を0°とし、炭素繊維集合体を12枚、(0°/90°/0°/90°/0°/90°)sとなるように積層し、炭素繊維と熱可塑性樹脂の体積比が25:75となるようにナイロン610樹脂フィルム(「CM2001」東レ(株)製)をさらに積層した後に、全体をステンレス板で挟み、240℃で90秒間予熱後、1.0MPaの圧力をかけながら180秒間、240℃にてホットプレスした。ついで、加圧状態で50℃まで冷却し、厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は298%と流動性に優れるものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が2.9×10-3[(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.016、初期荷重傾きが0.16であった。また、束を構成する炭素繊維本数の数量平均xは382本、標準偏差σは303であった。
炭素繊維束(E)を繊維長25mmにカットした以外は、実施例7と同様にして厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は276%と流動性に優れるものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が4.2×10-3[(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.025、初期荷重傾きが0.19であった。また、束を構成する炭素繊維本数の数量平均xは423本、標準偏差σは379であった。
炭素繊維束(A)を繊維長45mmにカットし、カットした炭素繊維束とポリプロピレン短繊維を実施例6と同様に混合し、カーディング、クロスラップして、炭素繊維とポリプロピレン繊維とからなる目付100g/m2のシート状の炭素繊維集合体を形成した。シート状の炭素繊維集合体を実施例6と同様に積層し、炭素繊維と熱可塑性樹脂の体積比が40:60となるようにポリプロピレン樹脂メルトブロー不織布をさらに積層した後に、実施例6と同様にホットプレス、冷却して厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は160%と流動性に劣るものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が36.2×10-3 [(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.008、初期荷重傾きが0.81であった。また、束を構成する炭素繊維本数の数量平均xは446本、標準偏差σは402であった。
炭素繊維束(D)を繊維長15mmにカットし、カットした炭素繊維束と実施例1と同じナイロン6短繊維を用いて実施例1と同様にカーディング装置に投入し、クロスラップしてシート状の炭素繊維集合体を形成した。得られたシート状の炭素繊維集合体とナイロン樹脂メルトブロー不織布を実施例1と同様にして積層し、さらに実施例1と同様にホットプレスした後に冷却し、厚さ2mmの炭素繊維複合材料の平板を得た。得られた平板の流動試験を実施したところ、流動率は165%と流動性に劣るものであった。また、上記平板を500℃に加熱した電気炉の中で1時間加熱してマトリックス樹脂等の有機物を焼き飛ばして得られた炭素繊維マットの引張試験を実施したところ、仕事量が30.2×10-3 [(N・mm)/(g/m2)]、最大荷重到達後の傾きが-0.12、初期荷重傾きが0.68であった。また、束を構成する炭素繊維本数の数量平均xは512本、標準偏差σは360であった。
2 シリンダーロール
3 テイクインロール
4 ドッファーロール
5 ワーカーロール
6 ストリッパーロール
7 フィードロール
8 ベルトコンベアー
9 不連続な炭素繊維
10 シート状のウエブ
11 エアレイド装置
12 ドラム
13 ピンシリンダー
14 ワイヤ
15 サクションボックス
101 流動前の炭素繊維複合材料
102 プレス盤
103 プレス成形後の炭素繊維強化プラスチック
Claims (10)
- 幅25mmの試験片での引張試験における目付あたりの仕事量が1×10-3~30×10-3[(N・mm)/(g/m2)]である炭素繊維シートを補強材とし、熱可塑性樹脂をマトリックス樹脂とする炭素繊維複合材料。
- 前記炭素繊維シートの前記引張試験で得られる荷重[N/(g/m2)]×10-3―ひずみ[%]曲線における最大荷重到達後の傾きが-0.1~-0.01の範囲にある、請求項1に記載の炭素繊維複合材料。
- 前記炭素繊維シートの前記引張試験で得られる荷重[N/(g/m2)]×10-3―ひずみ[%]曲線における初期荷重負荷後の傾きが0.1~0.7の範囲にある、請求項1または2に記載の炭素繊維複合材料。
- 前記炭素繊維シートを形成する炭素繊維の繊維長が5~30mmの範囲にある、請求項1~3のいずれかに記載の炭素繊維複合材料。
- 前記炭素繊維シートが、所定長さに切断された炭素繊維束と熱可塑性樹脂短繊維とから形成されたシート状の炭素繊維集合体を出発原料として形成されたものからなる、請求項1~4のいずれかに記載の炭素繊維複合材料。
- Mn/(Ln×D)が8.5×-1(mg/mm2)以上の炭素繊維束(1)の、炭素繊維全体重量に対する割合Yが30≦Y<90(wt%)であり、前記炭素繊維束(1)のMn/Lnの平均値Xが1.1×10-2≦X≦8.1×10-2(mg/mm)の範囲にあり、前記YがY≧100X+30を満たす、請求項5に記載の炭素繊維複合材料。
Mn:炭素繊維束重量
Ln:繊維長さ
D:繊維径 - 前記炭素繊維シートを形成する炭素繊維束のうち、重量が0.01mg以上の炭素繊維束を構成する炭素繊維の本数が90本以上の炭素繊維束(3)を構成する炭素繊維の本数の数量平均xが90~1000本/束の範囲にあり、炭素繊維束(3)を構成する炭素繊維の本数の標準偏差σが50~500の範囲にある、請求項5に記載の炭素繊維複合材料。
- 前記炭素繊維束がサイジング剤を付着させたものからなる、請求項5~7のいずれかに記載の炭素繊維複合材料。
- 所定の温度、圧力条件で加圧したときの、加圧前の面積に対する加圧後の面積の比率で表される流動率が170%以上である、請求項1~8のいずれかに記載の炭素繊維複合材料。
- 請求項1~9のいずれかに記載の炭素繊維複合材料をプレス成形した炭素繊維強化プラスチック。
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| KR1020147032429A KR20150021027A (ko) | 2012-05-29 | 2013-05-15 | 탄소 섬유 복합 재료 |
| EP13797501.7A EP2857439A4 (en) | 2012-05-29 | 2013-05-15 | COMPOSITE MATERIAL BASED ON CARBON FIBERS |
| US14/403,677 US9481770B2 (en) | 2012-05-29 | 2013-05-15 | Carbon fiber composite material |
| JP2013522420A JP6331123B2 (ja) | 2012-05-29 | 2013-05-15 | 炭素繊維複合材料 |
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| PCT/JP2013/063520 Ceased WO2013179891A1 (ja) | 2012-05-29 | 2013-05-15 | 炭素繊維複合材料 |
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| Country | Link |
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| US (1) | US9481770B2 (ja) |
| EP (1) | EP2857439A4 (ja) |
| JP (1) | JP6331123B2 (ja) |
| KR (1) | KR20150021027A (ja) |
| WO (1) | WO2013179891A1 (ja) |
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| JP2013245253A (ja) * | 2012-05-24 | 2013-12-09 | Toray Ind Inc | 繊維強化複合材料およびその製造方法 |
| WO2014156760A1 (ja) * | 2013-03-26 | 2014-10-02 | 東レ株式会社 | 炭素繊維不織布 |
| WO2024237241A1 (ja) | 2023-05-15 | 2024-11-21 | 帝人株式会社 | 自動車用水平部材およびその製造方法 |
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| CA2855747A1 (en) * | 2011-11-16 | 2013-05-23 | Toray Industries, Inc. | Fiber-reinforced composite material and process for producing fiber-reinforced composite material |
| KR102023790B1 (ko) * | 2012-02-09 | 2019-09-20 | 도레이 카부시키가이샤 | 탄소 섬유 복합 재료 |
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| Publication number | Publication date |
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| US9481770B2 (en) | 2016-11-01 |
| US20150183941A1 (en) | 2015-07-02 |
| EP2857439A4 (en) | 2015-11-18 |
| JPWO2013179891A1 (ja) | 2016-01-18 |
| KR20150021027A (ko) | 2015-02-27 |
| JP6331123B2 (ja) | 2018-05-30 |
| EP2857439A1 (en) | 2015-04-08 |
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