WO2016204173A1 - エポキシ樹脂組成物、プリプレグおよび繊維強化複合材料 - Google Patents
エポキシ樹脂組成物、プリプレグおよび繊維強化複合材料 Download PDFInfo
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- WO2016204173A1 WO2016204173A1 PCT/JP2016/067771 JP2016067771W WO2016204173A1 WO 2016204173 A1 WO2016204173 A1 WO 2016204173A1 JP 2016067771 W JP2016067771 W JP 2016067771W WO 2016204173 A1 WO2016204173 A1 WO 2016204173A1
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- epoxy resin
- resin composition
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- CFXCQBWUMFAVSJ-UHFFFAOYSA-N 4-(2-cyclohexylphenoxy)-n,n-bis(oxiran-2-ylmethyl)aniline Chemical compound C1OC1CN(C=1C=CC(OC=2C(=CC=CC=2)C2CCCCC2)=CC=1)CC1CO1 CFXCQBWUMFAVSJ-UHFFFAOYSA-N 0.000 description 1
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- WEWBGPFWVSMYMP-UHFFFAOYSA-N 4-(2-naphthalen-2-yloxyphenoxy)-n,n-bis(oxiran-2-ylmethyl)aniline Chemical compound C1OC1CN(C=1C=CC(OC=2C(=CC=CC=2)OC=2C=C3C=CC=CC3=CC=2)=CC=1)CC1CO1 WEWBGPFWVSMYMP-UHFFFAOYSA-N 0.000 description 1
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- LSSWPDUBLAOHKT-UHFFFAOYSA-N 4-(4-nitrophenoxy)-n,n-bis(oxiran-2-ylmethyl)aniline Chemical compound C1=CC([N+](=O)[O-])=CC=C1OC1=CC=C(N(CC2OC2)CC2OC2)C=C1 LSSWPDUBLAOHKT-UHFFFAOYSA-N 0.000 description 1
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- ZMUCVNSKULGPQG-UHFFFAOYSA-N dodecanedioic acid;hexane-1,6-diamine Chemical compound NCCCCCCN.OC(=O)CCCCCCCCCCC(O)=O ZMUCVNSKULGPQG-UHFFFAOYSA-N 0.000 description 1
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- SQQCTLWZEJJCNB-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)-4-(4-phenoxyphenoxy)aniline Chemical compound C1OC1CN(C=1C=CC(OC=2C=CC(OC=3C=CC=CC=3)=CC=2)=CC=1)CC1CO1 SQQCTLWZEJJCNB-UHFFFAOYSA-N 0.000 description 1
- GJIHJADPBSMNFZ-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)-4-(4-phenylphenoxy)aniline Chemical compound C1OC1CN(C=1C=CC(OC=2C=CC(=CC=2)C=2C=CC=CC=2)=CC=1)CC1CO1 GJIHJADPBSMNFZ-UHFFFAOYSA-N 0.000 description 1
- VJOHYQMELJCMGX-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)-4-(4-propylphenoxy)aniline Chemical compound C1=CC(CCC)=CC=C1OC1=CC=C(N(CC2OC2)CC2OC2)C=C1 VJOHYQMELJCMGX-UHFFFAOYSA-N 0.000 description 1
- ZPEMUYUJMFRLFL-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)-4-[2-(trifluoromethyl)phenoxy]aniline Chemical compound FC(F)(F)C1=CC=CC=C1OC1=CC=C(N(CC2OC2)CC2OC2)C=C1 ZPEMUYUJMFRLFL-UHFFFAOYSA-N 0.000 description 1
- HPQDXWHEPFWTFQ-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)-4-[3-(trifluoromethyl)phenoxy]aniline Chemical compound FC(F)(F)C1=CC=CC(OC=2C=CC(=CC=2)N(CC2OC2)CC2OC2)=C1 HPQDXWHEPFWTFQ-UHFFFAOYSA-N 0.000 description 1
- NJPMKWAHFMFMTF-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)-4-[4-(trifluoromethyl)phenoxy]aniline Chemical compound C1=CC(C(F)(F)F)=CC=C1OC1=CC=C(N(CC2OC2)CC2OC2)C=C1 NJPMKWAHFMFMTF-UHFFFAOYSA-N 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
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- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- CHJVFEINHNDFKC-UHFFFAOYSA-N phenyl 3-aminobenzenesulfonate Chemical compound NC1=CC=CC(S(=O)(=O)OC=2C=CC=CC=2)=C1 CHJVFEINHNDFKC-UHFFFAOYSA-N 0.000 description 1
- 125000005543 phthalimide group Chemical group 0.000 description 1
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- 229920002530 polyetherether ketone Polymers 0.000 description 1
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Classifications
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G59/04—Polycondensates containing more than one epoxy group per molecule of polyhydroxy compounds with epihalohydrins or precursors thereof
- C08G59/06—Polycondensates containing more than one epoxy group per molecule of polyhydroxy compounds with epihalohydrins or precursors thereof of polyhydric phenols
- C08G59/063—Polycondensates containing more than one epoxy group per molecule of polyhydroxy compounds with epihalohydrins or precursors thereof of polyhydric phenols with epihalohydrins
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- C08G59/06—Polycondensates containing more than one epoxy group per molecule of polyhydroxy compounds with epihalohydrins or precursors thereof of polyhydric phenols
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/32—Epoxy compounds containing three or more epoxy groups
- C08G59/3227—Compounds containing acyclic nitrogen atoms
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/32—Epoxy compounds containing three or more epoxy groups
- C08G59/38—Epoxy compounds containing three or more epoxy groups together with di-epoxy compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
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- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5033—Amines aromatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/504—Amines containing an atom other than nitrogen belonging to the amine group, carbon and hydrogen
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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
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- 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
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
- C08J5/241—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres
- C08J5/243—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres using 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
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
- C08J5/249—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs characterised by the additives used in the prepolymer mixture
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy 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
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Definitions
- the present invention relates to a prepreg and a resin composition for molding a fiber reinforced composite material.
- fiber reinforced composite materials consisting of carbon fiber, glass fiber and other reinforcing fibers and epoxy resins, phenolic resins and other thermosetting resins are lightweight, yet have mechanical properties such as strength and rigidity, heat resistance and corrosion resistance. Due to its superiority, it has been applied to many fields such as aerospace, automobiles, railway vehicles, ships, civil engineering and sports equipment. In particular, in applications that require high performance, fiber reinforced composite materials using continuous reinforcing fibers are used. Carbon fiber with excellent specific strength and specific elastic modulus is used as the reinforcing fiber, and thermosetting resin is used as the matrix resin, and in particular, it has adhesion, heat resistance, elastic modulus and chemical resistance with carbon fiber, and is cured. Many epoxy resins with small shrinkage are used.
- Glass transition temperature is an indicator of heat resistance of fiber reinforced composite materials.
- a composite material used as an aircraft member is required to have high heat resistance not only in a dry state but also in a moisture absorption state, assuming actual operating conditions.
- a general epoxy resin used as a matrix resin for fiber-reinforced composite materials absorbs about 4% by mass when immersed in boiling water, and the glass transition temperature after water absorption is about 50 to 60 ° C. from the glass transition temperature in the dry state. It is known to decline.
- For fiber reinforced composite materials for aircraft components it is necessary to use a matrix resin having a high glass transition temperature even under moisture absorption conditions.
- members that require particularly high heat resistance such as aircraft engine members and fighter aircraft skin members are required to have a high glass transition temperature of 180 ° C. or higher.
- thermosetting resins having better heat resistance than epoxy resins.
- these resins have a higher viscosity at room temperature than epoxy resins, handling properties such as tackiness and draping properties when used as a prepreg are lowered.
- a fiber reinforced composite material is produced by a molding process in which a plurality of prepregs are stacked and then heated under pressure. When the tackiness of the prepreg is lowered, the adhesion between the prepregs is lowered when the prepreg is laminated, and the prepreg is peeled off immediately, so that the handleability is remarkably lowered.
- a high heat-resistant resin such as maleimide resin has a slow curing reaction, it needs to be heated at a high temperature for a long time when molding a prepreg, but its viscosity is greatly reduced as the temperature rises. Therefore, when molding a prepreg, a large amount of resin flows out, causing a decrease in the resin content of the composite material and voids in the resin, which may adversely affect mechanical properties and appearance. In recent years, studies have been made to improve the handleability of a prepreg using a maleimide resin.
- the oligomer component blended in the maleimide resin for the purpose of handling properties and viscosity control reduces the heat resistance of the resin, so that the high heat resistance of the maleimide resin is maintained and the handling property equivalent to an epoxy resin is imparted. This has not been achieved yet (Patent Document 5).
- An object of the present invention is to provide a prepreg and a resin composition for molding a fiber-reinforced composite material having excellent heat resistance under moisture absorption conditions.
- the epoxy resin composition of the present invention has the following constitution in order to achieve the above object. That is, an epoxy resin composition comprising the following component [A] and component [B], the cured product obtained by curing the epoxy resin composition at 180 ° C. for 2 hours in boiling water at 1 atmosphere An epoxy resin composition having a glass transition temperature of 180 ° C. or higher after immersion for 48 hours; [A]: a trifunctional or higher functional binaphthalene type epoxy resin represented by the following general formula (A-1);
- X represents an alkylene group having 1 to 8 carbon atoms or a group represented by the following general formula (A-2);
- R 1 to R 5 represent the following general formula (A-3 Or a group represented by (A-4), a hydrogen atom, a halogen atom, a phenyl group, or an alkyl group having 1 to 4 carbon atoms;
- R 1 to R 4 represent any ring of the naphthalene skeleton;
- R 5 may be added at any position of the benzene skeleton;
- three or more of R 1 to R 5 are represented by the following general formula ( A-3) or a group represented by general formula (A-3) and general formula (A-4) among R 1 to R 5 must be included.
- the other R's may be the same or different from each other;
- the prepreg of the present invention is a prepreg containing the epoxy resin composition and reinforcing fibers.
- the fiber-reinforced composite material of the present invention is a fiber-reinforced composite material containing a cured product of the epoxy resin composition and reinforcing fibers.
- an epoxy resin composition and a prepreg capable of forming a fiber-reinforced composite material having excellent heat resistance under moisture absorption conditions are provided.
- the composite material using this is useful for aircraft members, automobile members, industrial members and the like.
- the trifunctional or higher functional binaphthalene type epoxy resin of the component [A] is an epoxy resin represented by the following general formula (A-1).
- the component [A] has an effect of imparting excellent heat resistance to the obtained cured resin.
- X represents either an alkylene group having 1 to 8 carbon atoms or a group represented by the following general formula (A-2).
- R 1 to R 5 represent any one of a group represented by the following general formula (A-3) or (A-4), a hydrogen atom, a halogen atom, a phenyl group, and an alkyl group having 1 to 4 carbon atoms.
- R 1 to R 4 may be added to any ring of the naphthalene skeleton, or may be simultaneously added to both rings.
- R 5 may be added at any position of the benzene skeleton.
- R 1 to R 5 are groups represented by the following general formula (A-3), or, among R 1 to R 5 , the general formula (A-3) and the general formula ( It is necessary to include one or more groups represented by A-4), and the other R's may be the same or different from each other.
- the number of functional groups is preferably 3 to 10, and more preferably 3 to 5. If the number of functional groups is too large, the cured matrix resin may become brittle and impair impact resistance.
- the epoxy resin represented by the general formula (A-1) may be obtained by any production method, and can be obtained, for example, by reaction of hydroxynaphthalenes with epihalohydrin.
- the component [A] is preferably contained in an amount of 30 to 80% by mass, more preferably 40 to 70% by mass, based on 100% by mass of the total epoxy resin.
- the constituent element [A] is preferably contained in an amount of 30 to 80% by mass, more preferably 40 to 70% by mass, based on 100% by mass of the total epoxy resin.
- Examples of commercially available components [A] include “Epiclon (registered trademark)” EXA-4701, HP-4700, HP-4710, EXA-4750 (manufactured by DIC Corporation) and the like.
- the aromatic amine compound is used as a curing agent for thermally curing the epoxy resin.
- An epoxy resin composition with good heat resistance can be obtained by using the aromatic amine compound [B] as a curing agent.
- aromatic amine compound examples include 3,3′-diisopropyl-4,4′-diaminodiphenylmethane, 3,3′-di-t-butyl-4,4′-diaminodiphenylmethane, and 3,3′-diethyl.
- aromatic amine compounds may be used singly or may be appropriately blended and used. Moreover, when mixing with other components, either powder or liquid form may be used, and powder and liquid aromatic amine compounds may be mixed and used.
- the blending amount of the constituent element [B] is preferably such that the active hydrogen in the aromatic amine compound is in the range of 0.7 to 1.3 per one epoxy group in the epoxy resin composition. More preferably, the amount is 0.8 to 1.2.
- active hydrogen refers to a highly reactive hydrogen atom bonded to nitrogen, oxygen, or sulfur in an organic compound.
- compositions obtained by pre-reacting these epoxy resin and curing agent, or a part of them can be blended in the composition.
- This method may be effective for viscosity adjustment and storage stability improvement.
- a curing accelerator may be used in combination as long as the heat resistance and thermal stability of the epoxy resin composition are not impaired.
- the curing accelerator include tertiary amines, Lewis acid complexes, onium salts, imidazole compounds, urea compounds, hydrazide compounds, and the like.
- the compounding quantity of a hardening accelerator needs to be suitably adjusted with the kind to be used, Preferably it is 10 mass parts or less with respect to 100 mass parts of all the epoxy resins, More preferably, it is 5 mass parts or less.
- the blending amount of the curing accelerator is less than this range, it is possible to suppress a decrease in the thermal stability of the resulting resin composition.
- the heat resistance of the fiber reinforced composite material has a positive correlation with the heat resistance of the cured resin obtained by curing the epoxy resin composition. It is important that the heat resistance is high.
- the glass transition temperature of the cured resin product is often used as an index of heat resistance because the mechanical strength of the cured resin product, and thus the fiber-reinforced composite material, greatly decreases when the temperature of the atmosphere exceeds the glass transition temperature.
- the high heat resistance under a moisture absorption condition is calculated
- the glass transition temperature measured by DMA (dynamic viscoelasticity measurement) after immersion for 48 hours is required to be 180 ° C. or higher, and preferably 210 ° C. or higher.
- the epoxy resin composition may further contain a thermoplastic resin that is soluble in the component [C] epoxy resin composition.
- Component [C] is easily dissolved in the epoxy resin composition by heating, control of tackiness of the resulting prepreg, control of fluidity of the matrix resin when the prepreg is heat-cured, and fiber-reinforced composite material obtained This has the effect of imparting toughness without impairing the heat resistance and elastic modulus of the steel.
- thermoplastic resin a thermoplastic resin composed of a polyaryl ether skeleton is preferable.
- polysulfone, polyphenylsulfone, polyethersulfone, polyetherimide, polyphenylene ether, polyetheretherketone, polyetherethersulfone and the like can be mentioned.
- thermoplastic resins composed of a polyaryl ether skeleton may be used alone or in combination.
- polyethersulfone can be preferably used because it can impart toughness without lowering the heat resistance and mechanical properties of the obtained fiber-reinforced composite material.
- polyethersulfone that can be suitably used as a thermoplastic resin soluble in an epoxy resin composition
- “Sumika Excel (registered trademark)” PES 5003P manufactured by Sumitomo Chemical Co., Ltd.
- “VIRANTAGE (registered trademark) ) "VW-10700RFP”.
- the amount of component [C] is preferably in the range of 5 to 40 parts by weight, more preferably in the range of 10 to 35 parts by weight, and still more preferably 15 to 30 parts by weight with respect to 100 parts by weight of the total epoxy resin. Range. By setting the blending amount of the thermoplastic resin in such a range, it is possible to balance the viscosity of the resin composition, and thus the tack property of the obtained prepreg, and the mechanical properties of the obtained fiber-reinforced composite material.
- the epoxy resin composition may further contain a glycidylamine type epoxy resin having a component [D] trifunctional or higher.
- Component [D] is a compound having three or more epoxy groups in one molecule, and has the effect of increasing the heat resistance and elastic modulus of the resulting cured resin.
- the number of functional groups is preferably 3 to 7, and more preferably 3 to 4. By setting the number of functional groups to 7 or less, an epoxy resin composition having excellent toughness of the cured matrix resin and excellent impact resistance can be obtained.
- Such component [D] is preferably contained in an amount of 20 to 80% by mass, more preferably 30 to 60% by mass in 100% by mass of the total epoxy resin. It is preferable that the component [D] is 20% by mass or more because the cured resin is excellent in heat resistance and elastic modulus. On the other hand, it is preferable that the component [D] is 70% by mass or less because the elongation of the cured resin is excellent.
- tri- or higher functional glycidylamine type epoxy resins include diaminodiphenylmethane type epoxy resins, diaminodiphenylsulfone type epoxy resins, aminophenol type epoxy resins, metaxylenediamine type epoxy resins, and 1,3-bisaminomethylcyclohexane type epoxy resins.
- examples thereof include epoxy resins such as resins and isocyanurate type epoxy resins.
- an epoxy resin selected from diaminodiphenylmethane type epoxy resin, diaminodiphenylsulfone type epoxy resin and aminophenol type epoxy resin is particularly preferably used because of the good balance of physical properties of the obtained cured resin.
- ELM434 manufactured by Sumitomo Chemical Co., Ltd.
- Aldite registered trademark
- MY720, MY721, MY9512, MY9663 manufactured by Huntsman Advanced Materials
- TG4DAS tetraglycidyl-4,4'-diaminodiphenylsulfone, Mitsui Chemicals Fine Co., Ltd.
- TG3DAS tetraglycidyl-3,3'-diamino Diphenylsulfone, manufactured by Mitsui Chemicals Fine Co., Ltd.
- ELM120 and ELM100 above, manufactured by Sumitomo Chemical Co., Ltd.
- jER registered trademark
- the epoxy resin composition may further contain a bifunctional or higher functional epoxy resin as the constituent element [E], except for the constituent elements [A] and [D] and the constituent element [F] described later.
- Component [E] has a positive effect on the physical properties of the cured resin such as the modulus of elasticity, elongation, and toughness of the epoxy resin composition, and the viscosity of the epoxy resin composition and the prepreg by adjusting the blending amount. This has the effect of making the tack and drape properties appropriate.
- the number of functional groups of the constituent element [E] is 2 or more, preferably 2 to 5.
- the number of functional groups is 2 or more, preferably 2 to 5.
- the component [E] is preferably blended in an amount of 10 to 40% by mass, more preferably 20 to 30% by mass in 100% by mass of the total epoxy resin.
- the constituent element [E] is preferably blended in an amount of 10 to 40% by mass, more preferably 20 to 30% by mass in 100% by mass of the total epoxy resin.
- epoxy resin As the constituent element [E] because an epoxy resin composition having high heat resistance can be obtained.
- a glycidyl ether type epoxy resin or a glycidyl amine type epoxy resin having phenol as a precursor is preferably used.
- examples of such epoxy resins include bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, naphthalene type epoxy resins, biphenyl type epoxy resins, urethane-modified epoxy resins, and resorcinol type epoxy resins.
- Examples of the tri- or higher functional epoxy resin used as the constituent element [E] include phenol novolac type epoxy resin, orthocresol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, tetraphenylolethane type epoxy resin, 1, A 3-bisaminomethylcyclohexane type epoxy resin, an isocyanurate type epoxy resin, or a hydantoin type epoxy resin is preferably used.
- bisphenol A type epoxy resins include “EPON (registered trademark)” 825 (manufactured by Mitsubishi Chemical Corporation), “Epiclon (registered trademark)” 850 (manufactured by DIC Corporation), and “Epototo (registered trademark)”. “YD-128 (manufactured by Tohto Kasei Co., Ltd.), DER-331 and DER-332 (manufactured by Dow Chemical Co., Ltd.).
- bisphenol F type epoxy resins include “Araldite (registered trademark)” GY282 (manufactured by Huntsman Advanced Materials), “jER (registered trademark)” 806, “jER (registered trademark)” 807, “jER (Registered trademark) "1750 (manufactured by Mitsubishi Chemical Corporation),” Epicron (registered trademark) “830 (manufactured by DIC Corporation) and” Epototo (registered trademark) "YD-170 (manufactured by Toto Kasei Corporation) ) And the like.
- naphthalene type epoxy resin examples include “Epiclon (registered trademark)” HP-4032D (manufactured by DIC Corporation).
- Examples of the glycidylamine type epoxy resin include PG-01 (diglycidyl-p-phenoxyaniline, manufactured by Toray Fine Chemical Co., Ltd.).
- Examples of commercially available resorcinol-type epoxy resins include “Deconal (registered trademark)” EX-201 (manufactured by Nagase ChemteX Corporation).
- TETRAD-C manufactured by Mitsubishi Gas Chemical Co., Ltd.
- TEPIC-P (manufactured by Nissan Chemical Industries, Ltd.) can be mentioned.
- trishydroxyphenylmethane type epoxy resins examples include Tactix 742 (manufactured by Huntsman Advanced Materials).
- biphenyl type epoxy resins examples include NC-3000 (manufactured by Nippon Kayaku Co., Ltd.).
- Examples of commercially available dicyclopentadiene type epoxy resins include “Epiclon (registered trademark)” HP7200 (manufactured by DIC Corporation).
- Examples of commercially available urethane-modified epoxy resins include AER4152 (manufactured by Asahi Kasei Epoxy Corporation).
- phenol novolac epoxy resins examples include DEN431 and DEN438 (manufactured by Dow Chemical Co., Ltd.) and “jER (registered trademark)” 152 (manufactured by Mitsubishi Chemical Corporation).
- ortho-cresol novolac epoxy resins examples include EOCN-1020 (manufactured by Nippon Kayaku Co., Ltd.) and “Epiclon (registered trademark)” N-660 (manufactured by DIC Corporation).
- a commercial product of hydantoin type epoxy resin includes AY238 (manufactured by Huntsman Advanced Materials).
- the epoxy resin composition may further include a component [F].
- the constituent element [F] is an epoxy resin having two or more ring structures of four or more members and having a glycidylamino group or a glycidyl ether group directly connected to the ring structure.
- having two or more ring structures of 4 or more members means having two or more monocyclic structures of 4 or more members such as cyclohexane, benzene or pyridine, or 4 member rings such as phthalimide, naphthalene or carbazole. It shows having one or more condensed ring structures composed of the above rings.
- a glycidylamino group directly linked to a ring structure indicates that the ring structure has a structure in which N atoms of a bifunctional glycidylamino group are bonded.
- the glycidyl ether group directly connected to the ring structure indicates that the ring structure has a structure in which an O atom of a monofunctional glycidyl ether group is bonded.
- the blending amount of the component [F] is preferably 5 to 40% by mass in 100% by mass of the total epoxy resin.
- the monofunctional epoxy resin is excellent in strength development effect, and the bifunctional epoxy resin is excellent in heat resistance.
- the component [F] is a monofunctional epoxy resin
- the blending amount is more preferably 5 to 30% by mass with respect to the total amount of all epoxy resins.
- the component [F] is a bifunctional epoxy resin
- the blending amount is more preferably 10 to 40% by mass with respect to the total amount of all epoxy resins.
- the component [F] is more preferably a bifunctional epoxy resin in that excellent heat resistance is obtained.
- the content of the component [D] is preferably 10 to 60% by mass in 100% by mass of the total epoxy resin. More preferably, it is 20 to 50% by mass.
- the component [D] is preferably 10% by mass or more because the elastic modulus of the cured resin is excellent. On the other hand, it is preferable that the component [D] is 60% by mass or less because the toughness of the cured resin is excellent.
- constituent element [F] is preferably a bifunctional epoxy resin having a structure represented by the following general formula (F-1) in that excellent heat resistance and mechanical properties can be obtained.
- R 6 and R 7 are each independently an aliphatic hydrocarbon group having 1 to 4 carbon atoms, an alicyclic hydrocarbon group having 3 to 6 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms.
- n is an integer of 0 to 4
- m is an integer of 0 to 5.
- Y represents one selected from —O—, —S—, —CO—, —C ( ⁇ O) O—, —SO 2 —.
- Specific compounds of the component [F] include glycidyl phthalimide, glycidyl-1,8-naphthalimide, glycidyl carbazole, glycidyl-3,6-dibromocarbazole, glycidyl indole, glycidyl-4-acetoxy indole, glycidyl- 3-methylindole, glycidyl-3-acetylindole, glycidyl-5-methoxy-2-methylindole, o-phenylphenyl glycidyl ether, p-phenylphenyl glycidyl ether, p- (3-methylphenyl) phenyl glycidyl ether, 2 , 6-Dibenzylphenyl glycidyl ether, 2-benzylphenyl glycidyl ether, 2,6-diphenylphenyl glycidyl
- [F] Commercially available components [F] include “Denacol (registered trademark)” Ex-731 (N-glycidylphthalimide, manufactured by Nagase ChemteX Corporation), OPP-G (o-phenylphenylglycidyl ether, Sanko Co., Ltd.) And PG-01 (diglycidyl-p-phenoxyaniline, manufactured by Toray Fine Chemical Co., Ltd.).
- an epoxy compound other than those described above can be appropriately blended as long as it does not cause a significant decrease in heat resistance and mechanical properties.
- the epoxy resin composition is a cured resin obtained by curing the epoxy resin composition, which has both high heat resistance and elongation, and has a fiber reinforced composite material that has high heat resistance and excellent tensile strength. Therefore, the molecular weight ⁇ between the theoretical crosslinking points of the cured resin is preferably 220 g / mol or more. The molecular weight ⁇ between the theoretical cross-linking points is more preferably in the range of 220 to 350 g / mol, and further preferably in the range of 230 to 310 g / mol.
- the molecular weight ⁇ between the theoretical crosslinking points is a value derived by calculation from each component constituting the epoxy resin composition
- the weight W of the total resin cured product obtained by curing the epoxy resin composition is defined as the total resin. It is a value divided by the number c of crosslinking points of the cured product.
- the weight W of all resin cured products means the total weight of all epoxy resin components and aromatic amine components contained in the epoxy resin composition, and other components are not included in the calculation.
- the molecular weight ⁇ between the theoretical crosslinking points is inversely proportional to the crosslinking density of the cured resin.
- the molecular weight ⁇ between the theoretical cross-linking points has a positive correlation with the toughness of the cured resin and has a negative correlation with the glass transition temperature, which is an index of heat resistance.
- the molecular weight ⁇ between the theoretical crosslink points is 220 g / mol or more, an appropriate crosslink density of the cured resin is obtained, the toughness of the cured resin is increased, and mechanical properties such as tensile strength of the resulting fiber reinforced composite material are obtained. Get higher.
- the molecular weight ⁇ between the theoretical crosslinking points can be obtained by the calculation described below.
- the compounding amount of the i-th (i is an integer from 1 to k) epoxy resin component is selected as a i (unit). : G).
- the epoxy resin composition contains l type (1 is an integer) aromatic amine component
- the j-th (j is an integer of 1 to 1) aromatic amine compounding amount among them is set to b j ( Assuming that the unit is g), the weight W (unit: g) of the entire resin cured product is obtained by the formula (1).
- the epoxy equivalent of the i-th epoxy resin component is E i (unit: g / mol), and the number of epoxy groups in one molecule of the i-th epoxy resin component is x i .
- the active hydrogen equivalent of the j-th aromatic amine component is H j (unit: g / mol), and the number of active hydrogens possessed by one molecule of the j-th aromatic amine component is y j .
- the number c (unit: mol) of the crosslinking points contained in the cured resin is that the compounding ratio of the epoxy resin and the aromatic amine is stoichiometric, the aromatic amine is excessive, and the epoxy resin is In the case of excess, the method of determination is different. Which method is to be used is determined by a blending ratio index ⁇ representing the blending ratio between the epoxy resin and the aromatic amine, which is determined by the formula (2).
- the compounding ratio of the epoxy resin and the aromatic amine is a stoichiometric amount
- the number c of the crosslinking points is obtained by the formula (3).
- This number c of cross-linking points represents the number of cross-linking points generated by the reaction of all reactive epoxy groups and the active hydrogens of all aromatic amines.
- E i ⁇ x i and H j ⁇ y j represent the average molecular weight of the i-th epoxy resin component and the average molecular weight of the j-th aromatic amine component, respectively.
- (x i -2) represents the number of cross-linking points generated when all the epoxy groups in one molecule of the i-th epoxy resin component react with the active hydrogen of the aromatic amine and are incorporated into the cross-linked structure.
- (y j -2) represents the number of crosslinking points generated when all active hydrogens in one molecule of the j-th aromatic amine react with the epoxy group and are incorporated into the crosslinked structure.
- the i-th epoxy resin component is a tetrafunctional epoxy resin
- one molecule has four epoxy groups
- the number of resulting cross-linking points is two (4-2).
- the number of crosslinking points generated is calculated as zero.
- the j-th aromatic amine component has two active hydrogens per molecule
- the number of cross-linking points generated is 0, 2-2.
- epoxy resin 1 epoxy group: 3, epoxy equivalent: 98 g / eq
- epoxy resin 2 epoxy equivalent: 2, epoxy equivalent: 135 g / eq
- aromatic amine 1 The theoretical molecular weight ⁇ between the cross-linking points of the resin cured product of the epoxy resin composition consisting of 44.7 active hydrogen: 4 and active hydrogen equivalent: 45 g / eq
- cured material is 144.7g from Formula (1).
- ⁇ obtained from the equation (2) is 1, the number c of crosslinking points of all the cured resin products is obtained as 0.803 mol according to the equation (3). Therefore, the molecular weight ⁇ between the theoretical cross-linking points of the cured resin is determined as 180 g / mol according to the equation (6).
- the epoxy resin composition preferably contains 20 to 60% by mass, more preferably 40 to 60% by mass, of an epoxy resin component that is liquid at 40 ° C. in 100% by mass of all epoxy resins.
- the epoxy resin composition may contain thermoplastic resin particles insoluble in the epoxy resin composition.
- Thermoplastic resin particles have the effect of improving the impact resistance of the resulting fiber-reinforced composite material.
- a fiber reinforced composite material has a laminated structure. When an impact is applied to the fiber reinforced composite material, high stress is generated between the layers, and peeling damage occurs. Therefore, in order to improve impact resistance against external impact, a resin layer that does not contain reinforcing fibers (hereinafter referred to as “interlayer resin layer”) is formed between the layers made of reinforcing fibers of the fiber-reinforced composite material.
- the toughness may be improved. Although the toughness is improved by blending the constituent element [C] with the epoxy resin, in order to increase the toughness of the interlayer resin layer of the fiber reinforced composite material, thermoplastic resin particles insoluble in the epoxy resin composition are further blended. May be.
- thermoplastic resin which is a component of such particles
- polyamide or polyimide can be preferably used, and among them, polyamide which can greatly improve impact resistance due to excellent toughness is most preferable.
- polyamide nylon 12, nylon 11, nylon 6, nylon 66, nylon 6/12 copolymer, and an epoxy compound described in Example 1 of JP-A-01-104624 are semi-IPN (polymer interpenetrating network structure).
- Nylon (semi-IPN nylon) or the like can be suitably used.
- thermoplastic resin particles may be spherical particles, non-spherical particles, or porous particles, but the spherical shape is superior in viscoelasticity because it does not deteriorate the flow characteristics of the resin, and there is no origin of stress concentration. This is a preferred embodiment in terms of giving high impact resistance.
- polyamide particles include SP-500, SP-10, TR-1, TR-2, 842P-48, 842P-80 (above, manufactured by Toray Industries, Inc.), “Orgasol (registered trademark)” 1002D. , 2001UD, 2001EXD, 2002D, 3202D, 3501D, 3502D (above, manufactured by Arkema Co., Ltd.), “Grillamide (registered trademark)” TR90 (manufactured by Mzavelke Co., Ltd.), “TROGAMID (registered trademark)” CX7321, CX9701 CX9704 (made by Degussa Co., Ltd.) and the like can be used. These polyamide particles may be used alone or in combination.
- the number average particle diameter of the thermoplastic resin particles is preferably in the range of 5 to 50 ⁇ m, more preferably in the range of 7 to 40 ⁇ m, still more preferably in the range of 10 to 30 ⁇ m.
- the prepreg of the present invention is obtained by combining the above-described epoxy resin composition with a reinforcing fiber as a matrix resin.
- a reinforcing fiber include carbon fiber, graphite fiber, aramid fiber, and glass fiber, and carbon fiber is particularly preferable.
- any type of carbon fiber can be used depending on the application, but a carbon fiber having a tensile elastic modulus of 400 GPa at the highest is preferable from the viewpoint of impact resistance.
- a carbon fiber having a tensile strength of 4.4 to 6.5 GPa is preferably used because a composite material having high rigidity and mechanical strength can be obtained.
- the tensile elongation is also an important factor, and carbon fibers having a high elongation with a tensile elongation of 1.7 to 2.3% are preferred.
- Carbon fibers having a tensile modulus of at least 230 GPa, a tensile strength of at least 4.4 GPa, and a tensile elongation of at least 1.7% are most suitable.
- Carbon fibers include “Torayca (registered trademark)” T1100G-24K, “Torayca (registered trademark)” T800S-24K, “Torayca (registered trademark)” T300-3K, and “Torayca (registered trademark)” T700S. -12K (manufactured by Toray Industries, Inc.).
- the prepreg can be manufactured by various known methods.
- the matrix resin is dissolved in an organic solvent selected from acetone, methyl ethyl ketone, methanol, and the like to lower the viscosity, and the wet method in which the reinforcing fiber is impregnated, or the matrix resin is heated to lower the viscosity without using the organic solvent,
- a prepreg can be produced by a method such as a hot melt method for impregnating reinforcing fibers.
- a prepreg in the wet method, can be obtained by immersing a reinforcing fiber in a liquid containing a matrix resin and then pulling it up and evaporating the organic solvent using an oven or the like.
- a matrix resin whose viscosity has been reduced by heating is impregnated directly into a reinforcing fiber, or a release paper sheet with a resin film once coated with a matrix resin on a release paper (hereinafter referred to as “resin”).
- the film may be referred to as “film” first), then a resin film is laminated on the reinforcing fiber side from both sides or one side of the reinforcing fiber, and the reinforcing fiber is impregnated with the matrix resin by heating and pressing. .
- the prepreg preferably has a reinforcing fiber amount of 70 to 2000 g / m 2 per unit area.
- the amount of the reinforcing fibers is less than 70 g / m 2, it is necessary to increase the number of laminated layers in order to obtain a predetermined thickness at the time of forming the fiber reinforced composite material, and the work may be complicated.
- the amount of reinforcing fibers exceeds 2000 g / m 2 , the prepreg drapability tends to deteriorate.
- the fiber mass content of the prepreg is preferably 30 to 90% by mass, more preferably 35 to 85% by mass, and further preferably 40 to 80% by mass.
- the fiber mass content is less than 30% by mass, the amount of the resin is too large to obtain the advantages of the fiber reinforced composite material having excellent specific strength and specific elastic modulus, and it is hardened when molding the fiber reinforced composite material. Sometimes the amount of heat generated is too high. On the other hand, if the fiber mass content exceeds 90% by mass, poor resin impregnation may occur, and the resulting composite material may have many voids.
- the viscosity of the matrix resin is preferably 50 to 5000 Pa ⁇ s at 50 ° C.
- the viscosity here is a complex viscoelastic modulus ⁇ * determined by a dynamic viscoelasticity measuring apparatus.
- tackiness is the adhesiveness at the time of use of a prepreg.
- Drapability is the flexibility of deformation of the prepreg, and is a characteristic that affects the shapeability of the mold during lamination. If the draping property is low, it is difficult to form a curved surface, and if the draping property is too high, wrinkles are likely to be close.
- the viscosity of the resin 50 Pa ⁇ s or more, when the prepreg is made by impregnating the epoxy resin composition into the reinforced fiber, it prevents the tackiness from being too strong or the tackiness from increasing. it can.
- the viscosity of the resin is less than 5000 Pa ⁇ s, the tackiness is insufficient and the resin does not adhere sufficiently to the mold, and it is difficult to mold into a mold having a poor drape and a curvature. Can be prevented.
- the minimum viscosity of a good matrix resin is preferably 0.01 to 1.5 Pa ⁇ s.
- the minimum viscosity refers to the minimum complex viscoelastic modulus ⁇ * min of the epoxy resin composition measured by the method described in the column of “(2) Viscosity measurement of epoxy resin composition” described later.
- the minimum viscosity 1.5 Pa ⁇ s or less, fluidity is imparted to the matrix resin, and a decrease in the mechanical strength of the fiber-reinforced composite material due to voids between layers formed when the prepreg is laminated is prevented. be able to.
- the fiber-reinforced composite material of the present invention includes a cured product of the epoxy resin composition of the present invention and reinforcing fibers.
- the fiber-reinforced composite material can be manufactured by laminating the above-described prepreg in a predetermined form and curing the resin by applying pressure and heating.
- a method for applying heat and pressure a press molding method, an autoclave molding method, a bagging molding method, a wrapping tape method, an internal pressure molding method, or the like is employed.
- the epoxy resin composition is directly impregnated into the reinforcing fiber, followed by heat curing, such as a hand layup method, a filament winding method, a pultrusion method, a resin injection molding method,
- a carbon fiber reinforced composite material can also be produced by a molding method such as a resin transfer molding method.
- the unit “part” of the composition ratio means part by mass unless otherwise specified.
- Various characteristics (physical properties) were measured in an environment of a temperature of 23 ° C. and a relative humidity of 50% unless otherwise specified.
- Component [C] Thermoplastic resin soluble in the epoxy resin composition “Sumika Excel (registered trademark)” PES 5003P (polyethersulfone, manufactured by Sumitomo Chemical Co., Ltd.) "VIRANAGE (registered trademark)” VW-10700RFP (Polyethersulfone, Solvay Specialty Polymers Co., Ltd.) “Nanostrength (registered trademark)” M22N (a block copolymer of butyl acrylate (Tg: ⁇ 54 ° C. and methyl methacrylate (Tg: 130 ° C.), manufactured by Arkema Co., Ltd.).
- Component [E] bifunctional or higher epoxy resin / naphthalene type epoxy resin (“Epiclon (registered trademark)” HP-4032D, manufactured by DIC Corporation, bifunctional, epoxy equivalent: 142, liquid at 40 ° C.
- Bisphenol F type epoxy resin (“Araldite (registered trademark)” GY282, manufactured by Huntsman Advanced Materials, bifunctional, epoxy equivalent: 172, liquid at 40 ° C) Cresol novolac type epoxy resin (“Epiclon (registered trademark)” N-660, manufactured by DIC Corporation, polyfunctional, epoxy equivalent: 206, solid at 40 ° C.) Biphenyl type epoxy resin (“jER (registered trademark)” YX4000, manufactured by Mitsubishi Chemical Corporation, bifunctional, epoxy equivalent: 186, solid at 40 ° C.) Bisphenol F-type epoxy resin (“jER (registered trademark)” 807, manufactured by Mitsubishi Chemical Corporation, bifunctional, epoxy equivalent: 170, liquid at 40 ° C.) Bisphenol A type epoxy resin (“jER (registered trademark)” 825, manufactured by Mitsubishi Chemical Corporation, bifunctional, epoxy equivalent: 175, liquid at 40 ° C.) -Bisphenol F type epoxy resin (“EPICLON (registered trademark)” 830, manufactured by DIC Corporation, bi
- Component [F] an epoxy resin having two or more ring structures of 4 or more members and having an amine-type glycidyl group or an ether-type glycidyl group directly bonded to the ring structure: TRAY EPOXY PG-01 Diglycidyl-p-phenoxyaniline, manufactured by Toray Fine Chemical Co., Ltd., bifunctional, epoxy equivalent: 167, liquid at 40 ° C) "Denacol (registered trademark)" Ex-731 (N-glycidylphthalimide, manufactured by Nagase ChemteX Corporation, monofunctional, epoxy equivalent: 216, liquid at 40 ° C) OPP-G (o-phenylphenylglycidyl ether, manufactured by Sanko Co., Ltd., monofunctional, epoxy equivalent: 226, liquid at 40 ° C.) N, N-diglycidyl-3- (phenylsulfonyl) aniline (bifunctional, epoxy equivalent: 173, liquid at 40 ° C.
- the intersection temperature value between the tangent in the glass state and the tangent in the transition state was defined as the glass transition temperature.
- the measurement was performed at a heating rate of 5 ° C./min and a frequency of 1 Hz.
- the viscosity of the epoxy resin composition was measured using a dynamic viscoelastic device ARES-2KFRTN1-FCO-STD (manufactured by TA Instruments).
- a flat parallel plate with a diameter of 40 mm was used for the upper and lower measuring jigs, and after setting the epoxy resin composition between the upper and lower jigs so that the distance between the upper and lower jigs was 1 mm, the torsion mode (measurement frequency) : 0.5 Hz).
- the temperature was raised from 40 ° C. to 150 ° C. at a rate of 2 ° C./min, the complex viscoelastic modulus at 50 ° C. was ⁇ * 50 , and the lowest complex viscoelastic modulus in the range of 40 ° C. to 150 ° C. was ⁇ * min .
- Tack property measurement of prepreg The tack property of the prepreg was measured using a tack tester (PICMA tack tester II: manufactured by Toyo Seiki Co., Ltd.). An 18 mm ⁇ 18 mm cover glass was pressure-bonded to the prepreg with a force of 0.4 kgf for 5 seconds, the cover glass was pulled at a speed of 30 mm / min, and the tack value was measured by the resistance force at the time of peeling.
- the tack value is 0.1 kg or more and less than 0.3 kg, or more than 2.0 kg and 3.0 kg or less, and the tackiness is slightly strong or slightly weak.
- C The tack value is less than 0.1 kg or greater than 3.0 kg, and the tackiness is too strong or not tacky.
- This quasi-isotropic reinforcement was cut into a rectangle with a 30 ° angle of 304.8 mm and a 90 ° direction of 38.1 mm, a 6.35 mm diameter circular hole was drilled in the center, and processed into a perforated plate. I got a piece.
- This test piece was subjected to a perforated compression test (measured at 82 ° C. after being immersed in 70 ° C. warm water for 2 weeks) using an Instron universal testing machine according to the standard of ASTM-D6484.
- the temperature was lowered to a temperature of 55 to 65 ° C.
- the constituent element [B] shown in Table 1 was added, and the mixture was stirred for 30 minutes to obtain an epoxy resin composition.
- the compounding amount of the component [B] was such that the active hydrogen contained in the component [B] was 0.9 mol with respect to 1 mol of the epoxy group contained in the epoxy resin composition.
- “equivalent” of the component [B] means the number of moles of active hydrogen contained in the component [B] with respect to 1 mol of the epoxy group contained in the epoxy resin composition. Means.
- the obtained resin composition was measured in accordance with “(1) Method for measuring glass transition temperature after water absorption of cured epoxy resin” in the various evaluation methods described above. As a result, the glass transition temperature after water absorption was 251 ° C. Yes, high heat resistance was obtained.
- the viscosity of the obtained resin composition was measured according to “(2) Viscosity measurement of epoxy resin composition” in the various evaluation methods described above.
- ⁇ * 50 was 569 Pa ⁇ s
- a prepreg having good tackiness as described later was obtained.
- ⁇ * min was 0.29 Pa ⁇ s, the resin flow during prepreg molding was appropriately controlled, and no voids or the like were observed in the molded fiber-reinforced composite material.
- the resin composition obtained above was applied onto release paper using a knife coater to produce two resin films having a resin basis weight of 51.2 g / m 2 .
- two obtained resin films are stacked from both sides of the carbon fiber, and the temperature is 130 ° C. and the maximum pressure is 1 MPa.
- the prepreg was obtained by impregnating the epoxy resin composition by heating and pressing under the conditions described above.
- the obtained prepreg was measured in accordance with “(3) Measurement of tackiness of prepreg” in the various evaluation methods described above. As a result, it was 1.10 kg, and good tackiness was obtained. Moreover, the drape property at the time of shaping
- the obtained prepreg was measured according to “(5) 0 ° tensile strength measurement of carbon fiber reinforced composite material” of the various evaluation methods described above, the tensile strength was 2831 MPa, and good tensile strength was obtained. It was.
- the obtained prepreg was measured according to “(6) Measurement of porous compressive strength (OHC) of carbon fiber reinforced composite material under high temperature moisture absorption conditions” in the various evaluation methods described above.
- the strength was 268 MPa, and an excellent compressive strength was obtained even at high temperature moisture absorption.
- Example 2 An epoxy resin corresponding to the constituent element [A] and constituent element [D] shown in Table 1 is put into a kneading apparatus, the temperature is raised to 100 ° C., and the mixture is heated and kneaded at a temperature of 100 ° C. for 30 minutes. Element [A] was dissolved.
- Example 2 even when the component [C] was blended, a prepreg having a high glass transition temperature after water absorption of 240 ° C. and an appropriate tackiness and draping property was obtained.
- the tensile strength was 2867 MPa
- the porous compressive strength at high temperature moisture absorption was 272 MPa
- high mechanical strength was obtained.
- Examples 3 to 15 are the same as Example 2 except that the types and blending amounts of the constituent elements [A], [C] and [D] contained in the epoxy resin composition are different as shown in Tables 1 and 2. Thus, an epoxy resin composition and a prepreg were prepared.
- Examples 16 to 33 have the compositions shown in Tables 2 to 4 and are the same as those in Example 2 except that the component [E] is added when the component [A] and the component [D] are kneaded in the kneading apparatus. It produced similarly.
- Comparative Examples 1 to 5 were prepared in the same manner as in Example 2 except that the composition was changed as shown in Table 4.
- the compounding amount of the component [B] is 0.9 mol of active hydrogen contained in the component [B] with respect to 1 mol of the epoxy group contained in the components [A], [D] and [F]. The amount.
- the obtained resin composition was subjected to viscosity measurement according to “(1) Method for measuring glass transition temperature after water absorption of cured epoxy resin” in the various evaluation methods described above. As a result, the glass transition temperature after water absorption was 205. It was ° C. and high heat resistance was obtained.
- the resin composition obtained above was applied onto release paper using a knife coater to produce two resin films having a resin basis weight of 51.2 g / m 2 .
- two obtained resin films are stacked from both sides of the carbon fiber, and the temperature is 130 ° C. and the maximum pressure is 1 MPa.
- the prepreg having a fiber mass content of 65 mass% was obtained by impregnating the epoxy resin composition by heating and pressurizing under the above conditions.
- the obtained prepreg was measured in accordance with “(5) 0 ° tensile strength measurement of carbon fiber reinforced composite material” in the various evaluation methods described above. As a result, the tensile strength was 3332 MPa, and high tensile strength suitable for composite materials for aircraft use. was gotten.
- Examples 35 to 64 are the same as in Example 34 except that the types of the constituent elements [A] to [F] contained in the epoxy resin composition are different, as shown in Tables 5 to 8. A prepreg was prepared.
- Examples 65 to 66> An epoxy resin corresponding to the constituent elements [A], [D] and [F] shown in Table 8 is put into a kneading apparatus, the temperature is raised to 100 ° C., and the mixture is heated and kneaded at 100 ° C. for 30 hours. The component [A] was dissolved.
- the temperature was lowered to a temperature of 55 to 65 ° C. while kneading was continued, the component [C] shown in Table 8 was added, the temperature was raised to 160 ° C., and the mixture was stirred at a temperature of 160 ° C. for 60 minutes.
- a prepreg was produced in the same manner as in Example 34 by using the obtained epoxy resin composition.
- Example 67 to 71 As shown in Table 8, Examples 67 to 71 were similar to Example 34 except that the types and blending amounts of the constituent elements [A] to [F] contained in the epoxy resin composition were different. A prepreg was prepared.
- Example 72 to 75 In Examples 70 to 75, as shown in Tables 8 to 9, the types and amounts of the constituent elements [A] to [F] contained in the epoxy resin composition are different, and other epoxy resin components were blended. Except that, an epoxy resin composition and a prepreg were produced in the same manner as in Example 34.
- an epoxy resin composition was prepared by blending the component [F] in an amount of 40 parts and further blending 0.9 equivalent of 3,3′-DAS as the component [B].
- the glass transition temperature after water absorption decreased to 155 ° C., and the heat resistance decreased as compared with Example 32. Further, the porous compressive strength after high temperature moisture absorption was 243 MPa, which was significantly lower than that of Example 32.
- Comparative Example 7 an epoxy resin composition was prepared with the blending amount of component [F] being 60 parts. Similar to Comparative Example 6, the glass transition temperature after water absorption decreased to 137 ° C., and the porous compressive strength after high temperature moisture absorption also decreased to 237 MPa.
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Abstract
Description
[A]:下記一般式(A-1)で示される3官能以上のビナフタレン型エポキシ樹脂;
(1)構成要素[A]:3官能以上のビナフタレン型エポキシ樹脂
・“エピクロン(登録商標)”EXA-4701(DIC(株)製、5官能、エポキシ当量:167、40℃で固体)
・“エピクロン(登録商標)”HP-4700(DIC(株)製、4官能、エポキシ当量:165、40℃で固体)
・“エピクロン(登録商標)”EXA-4750(DIC(株)製、3官能、エポキシ当量:185、40℃で固体)。
・セイカキュアS(4,4’-ジアミノジフェニルスルホン(4,4’-DDS)、セイカ(株)製、アミン当量:62)
・3,3’-DAS(3,3’-ジアミノジフェニルスルホン、三井化学ファイン(株)製、アミン当量:62)。
・“スミカエクセル(登録商標)”PES 5003P(ポリエーテルスルホン、住友化学(株)製)
・“VIRANTAGE(登録商標)”VW-10700RFP(ポリエーテルスルホン、ソルベイ・スペシャリティ・ポリマーズ(株)社製)
・“ナノストレングス(Nanostrength)(登録商標)”M22N(ブチルアクリレート(Tg:-54℃とメタクリル酸メチル(Tg:130℃)からなるブロック共重合体、アルケマ(株)製)。
・“アラルダイト(登録商標)”MY0600(トリグリシジル-m-アミノフェノール、ハンツマン・アドバンスト・マテリアルズ社製、3官能、エポキシ当量:118、40℃で液状)
・“アラルダイト(登録商標)”MY0510(トリグリシジル-p-アミノフェノール、ハンツマン・アドバンスト・マテリアルズ社製、3官能、エポキシ当量:118、40℃で液状)
・TG3DAS(テトラグリシジル-3,3’-ジアミノジフェニルスルホン、三井化学ファイン(株)製、4官能、エポキシ当量:138、40℃で固体)
・ELM434(テトラグリシジルジアミノジフェニルメタン、住友化学工業(株)製、4官能、エポキシ当量:120、40℃で液状)
・ELM120(トリグリシジルアミノフェノール、住友化学工業(株)製、3官能、エポキシ当量:118、40℃で液状)
・“jER(登録商標)”604(テトラグリシジルジアミノジフェニルメタン、三菱化学(株)製、4官能、エポキシ当量:120、40℃で液状)。
・ナフタレン型エポキシ樹脂(“エピクロン(登録商標)”HP-4032D、DIC(株)製、2官能、エポキシ当量:142、40℃で液状)
・ビスフェノールF型エポキシ樹脂(“アラルダイト(登録商標)”GY282、ハンツマン・アドバンスト・マテリアルズ社製、2官能、エポキシ当量:172、40℃で液状)
・クレゾールノボラック型エポキシ樹脂(“エピクロン(登録商標)”N-660、DIC(株)製、多官能、エポキシ当量:206、40℃で固体)
・ビフェニル型エポキシ樹脂(“jER(登録商標)”YX4000、三菱化学(株)製、2官能、エポキシ当量:186、40℃で固体)
・ビスフェノールF型エポキシ樹脂(“jER(登録商標)”807、三菱化学(株)製、2官能、エポキシ当量:170、40℃で液状)
・ビスフェノールA型エポキシ樹脂(“jER(登録商標)”825、三菱化学(株)製、2官能、エポキシ当量:175、40℃で液状)
・ビスフェノールF型エポキシ樹脂(“EPICLON(登録商標)”830、DIC(株)製、2官能、エポキシ当量:172、40℃で液状)
・グリシジルエーテル型エポキシ樹脂(“デナコール(登録商標)”EX-411、ナガセケムテックス(株)製、3官能、エポキシ当量:230、40℃で液状)。
・TORAY EPOXY PG-01(ジグリシジル-p-フェノキシアニリン、東レファインケミカル(株)製、2官能、エポキシ当量:167、40℃で液状)
・“デナコール(登録商標)”Ex-731(N-グリシジルフタルイミド、ナガセケムテックス(株)製、1官能、エポキシ当量:216、40℃で液状)
・OPP-G(o-フェニルフェニルグリシジルエーテル、三光(株)製、1官能、エポキシ当量:226、40℃で液状)
・下記方法で合成したN,N-ジグリシジル-3-(フェニルスルホニル)アニリン(2官能、エポキシ当量:173、40℃で液状)。
・“トレカ(登録商標)” T800S-24K-10E(繊維数24000本、繊度:1,033tex、引張弾性率:294GPa、密度1.8g/cm3、東レ(株)製)。
・ジシアンジアミド(DICY7、三菱化学(株)製、アミン当量:12)
・3-(3,4-ジクロロフェニル)1,1-ジメチルウレア(DCMU99、保土ヶ谷化学工業(株)製)
・オリゴマーA(jER807 390g、jER630(三菱化学(株)製) 260g、BXP(三井化学(株)製) 350gを100℃で1時間反応させた後、トリフェニルフォスフィン10gを加えてさらに100℃で3時間反応させたオリゴマー)
・“jER”(登録商標)キュアW(2,4-ジエチル-6-メチル-m-フェニレンジアミンと4,6-ジエチル-2-メチル-m-フェニレンジアミンの混合物、三菱化学(株)製)
・t-ブチルカテコール(東京化成工業(株)製)
・イミダゾールシランIS-1000(JX日鉱日石金属(株)製)。
以下の測定方法を使用し、各実施例のエポキシ樹脂組成物およびプリプレグを測定した。
エポキシ樹脂組成物をモールドに注入した後、熱風乾燥機中で30℃から速度1.5℃/分で昇温し、180℃で2時間加熱硬化した後、30℃まで速度2.5℃/分で降温して厚さ2mmの樹脂硬化板を作製した。作製した樹脂硬化板から幅12.7mm、長さ55mmの試験片を切り出し、1気圧下における沸騰水中に48時間浸漬した後、SACMA SRM18R-94に従い、DMA法によりガラス転移温度を求めた。貯蔵弾性率G’曲線において、ガラス状態での接線と転移状態での接線との交点温度値をガラス転移温度とした。ここでは、昇温速度5℃/分、周波数1Hzで測定した。
エポキシ樹脂組成物の粘度は、動的粘弾性装置ARES-2KFRTN1-FCO-STD(ティー・エイ・インスツルメント社製)を用いて測定した。上下部測定冶具に直径40mmの平板のパラレルプレートを用い、上部と下部の冶具間に、エポキシ樹脂組成物を、上下の冶具間の距離が1mmとなるようにセットした後、ねじりモード(測定周波数:0.5Hz)で測定した。40℃から150℃まで速度2℃/分で昇温し、50℃における複素粘弾性率をη* 50、40℃から150℃の範囲における最低複素粘弾性率をη* minとした。
プリプレグのタック性を、タックテスタ(PICMAタックテスタII:東洋精機(株)製)を用いて測定した。18mm×18mmのカバーガラスを0.4kgfの力で5秒間プリプレグに圧着し、該カバーガラスを30mm/分の速度にて引張り、剥がれる際の抵抗力にてタック値を測定した。ここで、タック性は、下記の3段階で評価した。測定数はn=5とし、測定結果が異なる場合は最低の評価を採用した。
A:タック値が0.3kg以上、2.0kg以下であり、程良い粘着性を示す。
B:タック値が0.1kg以上0.3kg未満、または2.0kgより大きく3.0kg以下であり、粘着性がやや強い、もしくはやや弱い。
C:タック値が0.1kg未満、または3.0kgより大きく、粘着性が強すぎるもしくは粘着性がない。
JIS K7017(1999)に記載されているとおり、一方向繊維強化複合材料の繊維方向を軸方向とし、軸方向を0°軸と定義したときの軸直交方向を90°と定義した。
一方向プリプレグを所定の大きさにカットし、一方向に6枚積層した後、真空バッグを行い、オートクレーブを用いて、温度180℃、圧力6kg/cm2、2時間で硬化させ、一方向強化材(炭素繊維強化複合材料)を得た。この一方向強化材を幅12.7mm、長さ230mmでカットし、両端に1.2mm、長さ50mmのガラス繊維強化プラスチック製のタブを接着し、試験片を得た。この試験片を、インストロン万能試験機を用いて、JIS K7073(1988)の規格に準じて0°引張試験を行った。
一方向プリプレグを所定の大きさにカットし、(+45/0/-45/90度)2Sの構成となるように16枚積層した後、真空バッグを行い、オートクレーブを用いて、温度180℃、圧力6kg/cm2、2時間で硬化させ、擬似等方強化材(炭素繊維強化複合材料)を得た。この擬似等方強化材を0゜方向が304.8mm、90゜方向が38.1mmの長方形に切り出し、中央部に直径6.35mmの円形の孔を穿孔して有孔板に加工して試験片を得た。この試験片を、インストロン万能試験機を用いて、ASTM-D6484の規格に準じて有孔圧縮試験(70℃の温水に2週間浸漬後、82℃で測定)を行った。
(エポキシ樹脂組成物の作製)
次の手法にて、エポキシ樹脂組成物を作製した。
前記にて得られた樹脂組成物を、ナイフコーターを用いて離型紙上に塗布して、樹脂目付が51.2g/m2の樹脂フィルムを2枚作製した。次に、繊維目付が190g/m2のシート状となるように一方向に配列させた炭素繊維に、得られた樹脂フィルムを2枚、炭素繊維の両面から重ね、温度130℃、最大圧力1MPaの条件で加熱加圧してエポキシ樹脂組成物を含浸させ、プリプレグを得た。
得られたプリプレグについて、前記した各種評価方法の「(3)プリプレグのタック性測定」に従い測定したところ、1.10kgとなり、良好なタック性が得られた。また、成形時のドレープ性も適切であり、プリプレグの皺や折れが問題となることは無かった。
混練装置中に、表1に記載の構成要素[A]、構成要素[D]に該当するエポキシ樹脂を投入し、100℃まで昇温し、100℃の温度で30分間加熱混練を行い、構成要素[A]を溶解させた。
実施例3~15は、表1~2に示すように、エポキシ樹脂組成物に含まれる構成要素[A]、[C]および[D]の種類および配合量が異なる以外は実施例2と同様にしてエポキシ樹脂組成物とプリプレグを作製した。
実施例16~33は、表2~4に示す組成で、混練装置中に構成要素[A]、構成要素[D]を混練する際に、構成要素[E]を加える以外は実施例2と同様にして作製した。
比較例1~5は、表4に示すように組成を変更した以外は実施例2と同様に作製した。
(エポキシ樹脂組成物の作製)
次の手法にて、エポキシ樹脂組成物を作製した。
前記にて得られた樹脂組成物を、ナイフコーターを用いて離型紙上に塗布して、樹脂目付が51.2g/m2の樹脂フィルムを2枚作製した。次に、繊維目付が190g/m2のシート状となるように一方向に配列させた炭素繊維に、得られた樹脂フィルムを2枚、炭素繊維の両面から重ね、温度130℃、最大圧力1MPaの条件で加熱加圧してエポキシ樹脂組成物を含浸させ、繊維質量含有率65質量%のプリプレグを得た。
得られたプリプレグについて、前記した各種評価方法の「(5)炭素繊維強化複合材料の0°引張強度測定」に従い測定したところ、引張強度は3332MPaとなり、航空機用途の複合材料に適した高い引張強度が得られた。
実施例35~64は、表5~8に示すように、エポキシ樹脂組成物に含まれる構成要素[A]~[F]の種類が異なる以外は実施例34と同様にしてエポキシ樹脂組成物とプリプレグを作製した。
混練装置中に、表8に記載の構成要素[A]、[D]および[F]に該当するエポキシ樹脂を投入し、100℃まで昇温し、100℃の温度で30時間加熱混練を行い、構成要素[A]を溶解させた。
実施例67~71は、表8に示すように、エポキシ樹脂組成物に含まれる構成要素[A]~[F]の種類および配合量が異なる以外は実施例34と同様にしてエポキシ樹脂組成物とプリプレグを作製した。
実施例70~75は、表8~9に示すように、エポキシ樹脂組成物に含まれる構成要素[A]~[F]の種類および配量合が異なる他、その他のエポキシ樹脂成分を配合した以外は実施例34と同様にしてエポキシ樹脂組成物とプリプレグを作製した。
表9に示すように組成を変更した以外は実施例34と同様にエポキシ樹脂組成物を調製し、ホットメルト法にてプリプレグを作製して各種測定を行った。各種測定の結果は表9に示す通りであった。
表10に示すように組成を変更した以外は実施例34と同様にエポキシ樹脂組成物を調製し、ホットメルト法にてプリプレグを作製して各種測定を行った。各種測定の結果は表10に示す通りであった。
Claims (14)
- 下記構成要素[A]および構成要素[B]を含むエポキシ樹脂組成物であって、該エポキシ樹脂組成物を180℃で2時間硬化して得られる硬化物を1気圧下における沸騰水中に48時間浸漬した後のガラス転移温度が180℃以上であるエポキシ樹脂組成物;
[A]:下記一般式(A-1)で示される3官能以上のビナフタレン型エポキシ樹脂;
- さらに構成要素[C]:エポキシ樹脂組成物に可溶な熱可塑性樹脂を含む請求項1に記載のエポキシ樹脂組成物。
- さらに構成要素[D]:3官能以上のグリシジルアミン型エポキシ樹脂を含み、かつ、全エポキシ樹脂100質量%中に、前記構成要素[A]を30~80質量%含み、かつ、エポキシ樹脂組成物を180℃で2時間硬化して得られる硬化物を1気圧下における沸騰水中に48時間浸漬した後のガラス転移温度が210℃以上である請求項1~2のいずれかに記載のエポキシ樹脂組成物。
- さらに構成要素[E]:2官能以上のエポキシ樹脂を、全エポキシ樹脂100質量%中に、10~40質量%含む請求項3に記載のエポキシ樹脂組成物。
- 50℃における粘度が50~5000Pa・sである請求項3~4のいずれかに記載のエポキシ樹脂組成物。
- 全エポキシ樹脂100質量%中に、40℃で液状であるエポキシ樹脂成分を20~60質量%含む請求項3~5のいずれかに記載のエポキシ樹脂組成物。
- さらに構成要素[F]:4員環以上の環構造を2つ以上有し、かつ、該環構造に直結したアミン型グリシジル基またはエーテル型グリシジル基を有するエポキシ樹脂を含み、かつ、理論架橋点間分子量が220g/mol以上である請求項1~2のいずれかに記載のエポキシ樹脂組成物。
- 全エポキシ樹脂100質量%中に、構成要素[A]を30~80質量%、構成要素[F]を5~40質量%含む請求項7に記載のエポキシ樹脂組成物。
- さらに[D]:3官能以上のグリシジルアミン型エポキシ樹脂を含み、全エポキシ樹脂100質量%中に、構成要素[D]を10~60質量%含む請求項7~8のいずれかに記載のエポキシ樹脂組成物。
- 構成要素[F]が1官能エポキシ樹脂である請求項10に記載のエポキシ樹脂組成物。
- 構成要素[B]がジアミノジフェニルスルホンである請求項1~11のいずれかに記載のエポキシ樹脂組成物。
- 請求項1~12のいずれかに記載のエポキシ樹脂組成物および強化繊維を含むプリプレグ。
- 請求項1~12のいずれかに記載のエポキシ樹脂組成物の硬化物および強化繊維を含む繊維強化複合材料。
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US20180134837A1 (en) | 2018-05-17 |
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EP3312210B1 (en) | 2022-03-30 |
RU2017145108A (ru) | 2019-07-22 |
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