WO2016063692A1 - エポキシ樹脂組成物および繊維強化複合材料 - Google Patents
エポキシ樹脂組成物および繊維強化複合材料 Download PDFInfo
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- WO2016063692A1 WO2016063692A1 PCT/JP2015/077644 JP2015077644W WO2016063692A1 WO 2016063692 A1 WO2016063692 A1 WO 2016063692A1 JP 2015077644 W JP2015077644 W JP 2015077644W WO 2016063692 A1 WO2016063692 A1 WO 2016063692A1
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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
- C08G59/20—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
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/042—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with carbon fibres
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- 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
- C08G59/20—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
- C08G59/22—Di-epoxy compounds
- C08G59/24—Di-epoxy compounds carbocyclic
- C08G59/245—Di-epoxy compounds carbocyclic aromatic
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- 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
- C08G59/20—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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- 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
- C08G59/20—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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- 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
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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
- C08G59/5006—Amines aliphatic
- C08G59/5013—Amines aliphatic containing more than seven carbon atoms, e.g. fatty amines
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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
- C08G59/5026—Amines cycloaliphatic
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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
- C08G59/5033—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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- 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
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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
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
- C08J2363/02—Polyglycidyl ethers of bis-phenols
Definitions
- the present invention relates to an epoxy resin composition preferably used as a matrix resin of a fiber reinforced composite material suitable for sports applications and general industrial applications, and a fiber reinforced composite material using the epoxy resin composition as a matrix resin.
- Epoxy resins are widely used in various industrial fields such as paints, adhesives, electrical and electronic information materials, and advanced composite materials because of their excellent mechanical properties.
- epoxy resins are frequently used in fiber-reinforced composite materials composed of matrix fibers and reinforcing fibers such as carbon fibers, glass fibers, and aramid fibers.
- polyamines, acid anhydrides, imidazoles, and the like are used as curing agents for such epoxy resins, but since polyamines are abundant and can be easily selected according to applications, they are used for fiber reinforced composite materials. It is often used for.
- a prepreg method, a hand lay-up method, a filament winding method, a pultrusion (pultrusion) method, an RTM (Resin Transfer Molding) method, or the like is appropriately selected.
- the fiber reinforced composite material members obtained by these methods show excellent strength and contribute to weight reduction of aircraft, sports equipment, automobiles, windmill blades, and the like.
- the demand for weight reduction has been further increased due to the recent increase in interest in the environment and the regulation of greenhouse gas emissions, and there has been a demand for further strengthening of fiber reinforced composite materials.
- Patent Document 1 discloses a reinforcing fiber having a high tensile strength.
- Patent Document 2 discloses a prepreg and a molded product thereof in which the tensile strength utilization factor is improved by controlling the balance between tensile fracture elongation and fracture toughness of the matrix resin.
- Patent Document 3 discloses an epoxy resin composition that provides a prepreg excellent in adhesiveness to a honeycomb core and tensile strength, characterized by having a rubber-like flat portion rigidity of 10 MPa or less.
- Patent Document 4 discloses an epoxy resin composition comprising a specific epoxy resin containing a tri- or higher functional aromatic epoxy resin and a liquid aromatic amine.
- Patent Document 5 discloses an epoxy resin composition comprising a trifunctional or higher functional epoxy resin used in a continuous pultrusion method and two kinds of curing agents having different reactivity, and polyamine is disclosed as a curing agent to be used. Has been.
- Patent Document 6 discloses a low-viscosity epoxy resin composition comprising a specific bifunctional epoxy resin and an aromatic diamine curing agent.
- Patent Document 7 discloses a low-temperature curable liquid epoxy resin composition comprising an aliphatic or alicyclic amine and an aromatic amine.
- Patent Document 8 discloses an epoxy resin composition having at least two types of exothermic peaks, and discloses that two different curing agents are used as the curing agent.
- Patent Document 9 discloses that a liquid curing component is obtained by solvating a second curing agent with a carrier, including two types of curing agents, and an epoxy resin comprising these curing components and an epoxy component. A composition is disclosed.
- the fiber reinforced composite material produced using the reinforcing fiber having high tensile strength described in Patent Document 1 is not suitable for general industrial use because the cost is increased although the strength is improved.
- Patent Document 2 since a large amount of a thermoplastic resin or a rubber component is blended in the matrix resin, the viscosity of the matrix resin increases. Therefore, it cannot be applied to a process using a liquid resin such as a filament winding method, a pultrusion method, and an RTM method.
- the resin composition disclosed in Patent Document 3 also has a high viscosity for prepreg and cannot be applied to a process using a liquid resin. Moreover, although it has high heat resistance, it cannot be said that the tensile strength of the fiber-reinforced composite material is sufficient.
- the epoxy resin compositions described in Patent Documents 6 to 9 also have heat resistance, but the tensile strength of the fiber-reinforced composite material is insufficient.
- an object of the present invention is to provide an epoxy resin composition that is suitably used for a fiber-reinforced composite material that achieves both high heat resistance and tensile strength at a high level. Moreover, it aims at providing the fiber reinforced composite material using this epoxy resin composition, and its molded article.
- the present inventors have found an epoxy resin composition having the following constitution, and have completed the present invention. That is, the epoxy resin composition of this invention consists of the following structures.
- An epoxy resin composition comprising at least the following components [A] and [B] and further comprising the component [C] or [D], wherein the dynamic viscosity of the cured product obtained by curing the epoxy resin composition
- An epoxy resin composition having a rubber state elastic modulus in elasticity evaluation of 10 MPa or less and a glass transition temperature of the cured product of 95 ° C. or more.
- the epoxy resin composition of the present invention includes at least the following elements [A] and [B], and further includes a constituent element [C] or [D].
- the [A] component trifunctional or higher aromatic epoxy resin in the present invention is blended in order to increase the heat resistance of the cured product of the epoxy resin composition.
- epoxy resins include novolak epoxy resins such as phenol novolac type epoxy resins and cresol novolac type epoxy resins, biphenyl aralkyl type and zylock type epoxy resins, N, N, O-triglycidyl-m-aminophenol, N , N, O-triglycidyl-p-aminophenol, N, N, O-triglycidyl-4-amino-3-methylphenol, N, N, N ′, N′-tetraglycidyl-4,4′-diamino Diphenylmethane, N, N, N ′, N′-tetraglycidyl-2,2′-diethyl-4,4′-methylenedianiline, N, N, N ′, N′-tetraglycidyl-m-xylylenediamine
- an epoxy resin other than the constituent element [A] can be blended within a range not losing the effect of the present invention.
- Examples of the epoxy resin other than the constituent element [A] include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, biphenyl type epoxy resin, naphthalene type epoxy resin, epoxy resin having a fluorene skeleton, Examples thereof include glycidyl resorcinol, glycidyl ether type epoxy resin, N, N-diglycidylaniline, and N, N-diglycidyl-o-toluidine. Epoxy resins may be used alone or in combination.
- diglycidylaniline which may be substituted is preferably used as the constituent element [E].
- examples of such an epoxy resin include N, N-diglycidylaniline and N, N-diglycidyl-o-toluidine.
- the component [B] in the present invention is an aromatic diamine having a substituent at the ortho position of each amino group or a cycloalkyl diamine having a substituent on the carbon atom adjacent to the carbon atom bonded to each amino group.
- the diamine of the constituent element [B] is one in which a substituent is arranged in the vicinity of two amino groups and steric hindrance is provided in the vicinity of the amino group that becomes a reaction site.
- Each substituent may be the same or different.
- an alkyl group having 1 to 4 carbon atoms is preferably used as the substituent.
- aromatic diamine having a substituent at the ortho position of each amino group examples include 2,6-diaminotoluene, diethyltoluenediamine, 4,4′-diamino-3,3′-diethyldiphenylmethane, 4,4′- Diamino-3,3′-dimethyldiphenylmethane, 4,4′-diamino-3,3 ′, 5,5′-tetramethyldiphenylmethane, 4,4′-diamino-3,3 ′, 5,5′-tetraethyldiphenylmethane Is mentioned.
- Examples of the cycloalkyldiamine having a substituent on the carbon atom adjacent to the carbon atom bonded to each amino group include 2,2'-dimethyl-4,4'-methylenebiscyclohexylamine.
- the aliphatic polyamine having an alkylene glycol structure as the constituent element [C] and the linear or branched aliphatic polyamine having 6 to 12 carbon atoms as the constituent element [D] are blended as components having excellent flexibility.
- Examples of the alkylene glycol structure of the constituent element [C] include polyoxyethylene, polyoxypropylene, a copolymer of polyoxyethylene and polyoxypropylene, and the like.
- an aliphatic polyamine having an amino group at the terminal is excellent in reactivity with an epoxy resin, is easily incorporated into a network with the epoxy resin, and improves the strength utilization rate of the fiber-reinforced composite material.
- Examples of the aliphatic polyamine having an amino group at the terminal include aliphatic polyamines having a 2-aminopropyl ether structure, a 2-aminoethyl ether structure, or a 3-aminopropyl ether structure.
- aliphatic polyamines having a 2-aminopropyl ether structure Commercial products of aliphatic polyamines having a 2-aminopropyl ether structure include “JEFFAMINE (registered trademark)” D-230, D-400, HK-511, T-403 (above, manufactured by Huntsman Japan K.K.) Is mentioned.
- Examples of commercially available aliphatic polyamines having a 2-aminoethyl ether structure include “JEFFAMINE (registered trademark)” EDR-148 (manufactured by Huntsman Japan K.K.).
- Examples of commercially available aliphatic polyamines having a 3-aminopropyl ether structure include “JEFFAMINE (registered trademark)” EDR-176 (manufactured by Huntsman Japan K.K.).
- JEFFAMINE registered trademark
- XTJ-568 manufactured by Huntsman Japan Co., Ltd.
- aliphatic polyamine of component [D] examples include hexamethylenediamine, triethylenetetramine, tetraethylenepentamine, and trimethylhexamethylenediamine.
- the aliphatic polyamines of the constituent elements [C] and [D] preferably have a molecular weight in the range of 100 to 600.
- the molecular weight By setting the molecular weight to 100 or more, the effect of reducing the crosslinking density can be better exhibited. Moreover, a heat resistance fall can be suppressed by making molecular weight 600 or less.
- the total amount of the constituent elements [B] and [C] or the constituent elements [B] and [D] is such that the active hydrogen groups are 0.6 to 1 with respect to the epoxy groups of all epoxy resin components contained in the epoxy resin composition. It is preferable that the amount be in the range of 2 equivalents. When the amount of active hydrogen groups falls within this range, a cured resin product that provides a fiber-reinforced composite material having an excellent balance between heat resistance and mechanical properties can be obtained.
- thermoplastic resin in the epoxy resin composition of the present invention, a thermoplastic resin can be blended as long as the effects of the present invention are not lost.
- thermoplastic resin a thermoplastic resin soluble in an epoxy resin, organic particles such as rubber particles and thermoplastic resin particles, and the like can be blended.
- thermoplastic resin soluble in the epoxy resin examples include polyvinyl acetal resins such as polyvinyl formal and polyvinyl butyral, polyvinyl alcohol, phenoxy resin, polyamide, polyimide, polyvinyl pyrrolidone, and polysulfone.
- polyvinyl acetal resins such as polyvinyl formal and polyvinyl butyral, polyvinyl alcohol, phenoxy resin, polyamide, polyimide, polyvinyl pyrrolidone, and polysulfone.
- Examples of rubber particles include cross-linked rubber particles and core-shell rubber particles obtained by graft polymerization of a different polymer on the surface of the cross-linked rubber particles.
- the epoxy resin composition of the present invention is suitably used for a fiber reinforced composite material produced by a filament winding method or a pultrusion method.
- the reinforcing fiber bundle is impregnated with the epoxy resin composition by passing the reinforcing fiber bundle through a resin tank containing the epoxy resin composition.
- the epoxy resin composition preferably has a low viscosity in order to improve the impregnation property into the reinforcing fiber bundle.
- the viscosity at 25 ° C. is preferably 2000 mPa ⁇ s or less, and more preferably 1600 mPa ⁇ s or less.
- the viscosity is an E-type viscometer equipped with a standard cone rotor (1 ° 34 ′ ⁇ R24) (Toki Sangyo ( , TVE-30H) at a temperature of 25 ° C. and a rotation speed of 10 revolutions / minute.
- a value obtained 1 minute after the preparation of the epoxy resin composition and the addition to the apparatus is adopted.
- the epoxy resin composition can be impregnated into the reinforcing fiber without requiring a special heating mechanism or dilution with an organic solvent in the resin tank.
- the epoxy resin composition since the reinforcing fiber bundle is continuously supplied, the epoxy resin composition must maintain fluidity in the resin tank. Therefore, a long pot life is required for the epoxy resin composition.
- a change in viscosity can be taken. Specifically, the viscosity after 30 minutes at 30 ° C. is not more than twice the original viscosity.
- the original viscosity is a value obtained 1 minute after the epoxy resin composition was prepared and put into an apparatus set at 30 ° C., and 30 minutes when continuously measured at a temperature of 30 ° C. It is preferable that the viscosity is not more than twice the later viscosity because the exchange of the epoxy resin in the resin tank can be reduced during the molding operation and the workability is improved.
- a fiber-reinforced composite material excellent in tensile strength utilization can be obtained by setting the rubbery state elastic modulus obtained by dynamic viscoelasticity evaluation of a cured product obtained by curing the epoxy resin composition of the present invention to 10 MPa or less.
- the rubber state elastic modulus is more preferably 9.0 MPa or less, and still more preferably 8.5 MPa or less.
- the rubber state elastic modulus is an index having a correlation with the crosslink density. Generally, the lower the crosslink density, the lower the rubber state elastic modulus.
- the tensile strength utilization rate is expressed as tensile strength of fiber reinforced composite material / (strand strength of reinforcing fiber ⁇ fiber volume content) ⁇ 100, and a high value indicates that the performance of reinforcing fiber is drawn higher. It can be said that the lightening effect is great.
- the fiber reinforced composite material is generated due to the environmental temperature at which the fiber reinforced composite material to which the epoxy resin composition is applied is used.
- a fiber-reinforced composite material excellent in environmental resistance can be obtained, in which deterioration of mechanical properties caused by distortion and deformation can be suppressed.
- the glass transition temperature is more preferably 105 ° C. or higher, and still more preferably 115 ° C. or higher.
- the conditions for curing the epoxy resin composition of the present invention are not particularly defined. For example, a method of obtaining a cured product by heating at a temperature of 100 ° C. for 2 hours and further heating at a temperature of 150 ° C. for 4 hours is common. Used for.
- an epoxy resin composition that includes the constituent elements [A] and [B] and further combines a low rubbery elastic modulus and excellent heat resistance by combining with the constituent elements [C] or [D]. it can. Furthermore, by using the epoxy resin composition as a matrix resin, a fiber-reinforced composite material having excellent heat resistance and tensile strength can be obtained.
- the amount of component [A] is in the range of 20 to 70 parts by mass per 100 parts by mass of the total epoxy resin. Preferably, it is in the range of 30 to 50 parts by mass.
- the blending ratio of the constituent elements [B] and [C] or [D] is preferably in the range of 1 to 1 to 7 to 1, and more preferably in the range of 1 to 1 to 5 to 1. .
- a kneader, a planetary mixer, a three-roll extruder and a twin-screw extruder may be used for kneading. If uniform kneading is possible, a beaker and Use a spatula or the like and mix by hand.
- the epoxy resin composition of the present invention prepared by the above method is composite-integrated with reinforcing fibers and then cured to obtain a fiber-reinforced composite material containing the cured product of the epoxy resin composition of the present invention as a matrix resin. be able to.
- the reinforcing fiber used in the present invention is not particularly limited, and glass fiber, carbon fiber, aramid fiber, boron fiber, alumina fiber, silicon carbide fiber and the like are used. Two or more of these fibers may be mixed and used. Among these, it is preferable to use carbon fibers from which a lightweight and highly rigid fiber-reinforced composite material can be obtained.
- the epoxy resin composition of the present invention is suitably used in processes using a liquid resin such as a filament winding method, a pultrusion method, and an RTM method.
- the epoxy resin composition of the present invention preferably has a viscosity at 25 ° C. of 2000 mPa ⁇ s or less from the viewpoint of suitability for these processes.
- the fiber-reinforced composite material using the epoxy resin composition of the present invention is preferably used for structures of movable bodies such as pressure vessels, drive shafts, electric wire cable core materials, automobiles, ships and railway vehicles, and cable applications. Especially, it uses suitably for manufacture of the pressure vessel by filament winding.
- Component [D] straight or branched aliphatic polyamine [D] -1 HMDA having 6 to 12 carbon atoms (hexamethylenediamine, manufactured by Toray Industries, Inc.).
- ⁇ Method for preparing epoxy resin composition The epoxy resin of component [A] and the other epoxy resin were put into a beaker, heated to a temperature of 80 ° C., and kneaded for 30 minutes. Thereafter, while continuing kneading, the temperature was lowered to 30 ° C. or lower, and the amines of the constituent elements [B] and [C] or [D] were added and stirred for 10 minutes to obtain an epoxy resin composition.
- Table 1 to Table 3 show component blend ratios of Examples 1 to 18 and Comparative Examples 1 to 8.
- ⁇ Measurement of viscosity of epoxy resin composition> The viscosity of the epoxy resin composition prepared according to the above ⁇ Preparation Method of Epoxy Resin Composition> was measured according to the standard cone rotor (1 ° 34 ' Using an E-type viscometer (TVE-30H, manufactured by Toki Sangyo Co., Ltd.) equipped with ⁇ R24), the rotation speed was 10 rotations / minute. In addition, after preparing an epoxy resin composition, it injected
- the carbon fiber “Torayca (registered trademark)” T700S-12K-50C obtained by making the epoxy resin composition prepared according to the above ⁇ Preparation Method of Epoxy Resin Composition> into a sheet shape aligned in one direction.
- the basis weight was 150 g / m 2 ) to obtain an epoxy resin-impregnated carbon fiber sheet. 8 sheets of the obtained sheets are stacked so that the fiber directions are the same, and then sandwiched between molds set to have a thickness of 1 mm with a metal spacer, and the molds are heat-cured for 2 hours with a press machine heated to 100 ° C. Carried out. Thereafter, the mold was taken out from the press and further cured by heating in an oven heated to 150 ° C. for 4 hours to obtain a fiber-reinforced composite material.
- a test piece having a width of 12.7 mm and a length of 45 mm was cut out from the cured resin, and a torsional vibration frequency of 1.0 Hz and a rate of temperature increase were measured using a viscoelasticity measuring device (ARES, manufactured by TA Instruments Inc.). DMA measurement was performed in the temperature range of 30 to 250 ° C. under the condition of 5.0 ° C./min, and the glass transition temperature and the rubber state elastic modulus were read.
- the glass transition temperature was the temperature at the intersection of the tangent in the glass state and the tangent in the transition state in the storage modulus G ′ curve.
- the rubbery state elastic modulus is a storage elastic modulus in a region where the storage elastic modulus is flat in a temperature region above the glass transition temperature, and here, the storage elastic modulus at a temperature 40 ° C. above the glass transition temperature. It was.
- the tensile strength utilization factor was calculated by the following formula: Tensile strength of fiber reinforced composite material / (Strand strength of reinforcing fiber ⁇ Fiber volume content) ⁇ 100.
- Example 1 30 parts by mass of “ARALDITE (registered trademark)” MY0510 as the component [A], 70 parts by mass of “jER (registered trademark)” 806 as an epoxy resin other than the component [A], and “jER as the component [B]
- jER registered trademark
- epoxy was prepared according to the above ⁇ Preparation Method of Epoxy Resin Composition>.
- a resin composition was prepared.
- the obtained epoxy resin composition had an initial viscosity of 1430 mPa ⁇ s at 25 ° C., and the viscosity after 30 minutes at 30 ° C. was not more than twice the original viscosity, and the viscosity characteristics were good.
- the glass transition temperature was 111 ° C.
- the rubber state elastic modulus was 9 MPa
- the heat resistance and rubber state elasticity was good.
- a fiber reinforced composite material was prepared according to ⁇ Method for producing fiber reinforced composite material> to obtain a fiber reinforced composite material having a fiber volume content of 65%.
- tensile strength of the obtained fiber reinforced composite material was measured by the above method and the strength utilization rate was calculated, it was 79%, which was favorable.
- Example 2 to 18 An epoxy resin composition, a cured epoxy resin, and a fiber reinforced composite material were produced in the same manner as in Example 1 except that the resin composition was changed as shown in Table 1 or 2, respectively.
- the obtained epoxy resin composition had good viscosity characteristics as in Example 1. Both the heat resistance and rubbery state elastic modulus of the obtained cured epoxy resin were good. The tensile strength utilization factor of the obtained fiber reinforced composite material was also good.
- Example 1 An epoxy resin composition and a cured resin were produced in the same manner as in Example 1 except that the component [A] was not added.
- the resin composition and evaluation results are shown in Table 3.
- the rubber state elastic modulus was 10 MPa or less, which was good, but the glass transition temperature was 95 ° C. or less, and the heat resistance was insufficient.
- Comparative Example 2 An epoxy resin composition and a cured resin product were produced in the same manner as in Example 1 except that the component [B] was not added.
- the resin composition and evaluation results are shown in Table 3.
- the rubber state elastic modulus was 10 MPa or less, which was good, but the glass transition temperature was 95 ° C. or less, and the heat resistance was insufficient.
- Example 3 An epoxy resin composition and a cured resin product were produced in the same manner as in Example 1 except that the component [C] was not added.
- the resin composition and evaluation results are shown in Table 3.
- the glass transition temperature was 95 ° C. or higher and the heat resistance was good, but the rubbery elastic modulus was higher than 10 MPa.
- the tensile strength utilization factor was 68%, which was insufficient.
- Example 4 The resin composition was changed as shown in Table 3, and an epoxy resin composition and a cured resin product were produced in the same manner as in Example 1.
- the solid amine was dissolved in a liquid amine in advance and then mixed with an epoxy resin.
- the resin composition and evaluation results are shown in Table 3.
- the glass transition temperature was 95 ° C. or higher and the heat resistance was good, but the rubbery elastic modulus was higher than 10 MPa.
- the tensile strength utilization factor was 67%, which was insufficient.
- Comparative Example 5 The resin composition was changed as shown in Table 3 (corresponding to the resin composition of Example 3 in JP-T-2008-508113), and an epoxy resin composition and a cured resin product were produced in the same manner as in Comparative Example 4.
- the resin composition and evaluation results are shown in Table 3.
- the glass transition temperature was 95 ° C. or higher and the heat resistance was good, but the rubbery elastic modulus was higher than 10 MPa.
- the tensile strength utilization factor was 70%, which was insufficient.
- Example 6 The epoxy resin composition and the cured resin were prepared in the same manner as in Example 1 except that the component [B] was not added and “Baxodur (registered trademark)” EC201 was used as the amine.
- the resin composition and evaluation results are shown in Table 3.
- the glass transition temperature was 95 ° C. or higher and the heat resistance was good, but the rubbery elastic modulus was higher than 10 MPa.
- the tensile strength utilization factor was 63%, which was insufficient.
- Example 7 With reference to the curing agent described in Example 1 of Patent Document 8 (Japanese Patent Publication No. 2014-521824), the component [C] or [D] was not added, and diethylenetriamine was used as the amine. Otherwise, an epoxy resin composition and a cured resin were produced in the same manner as in Example 1. The resin composition and evaluation results are shown in Table 3. The glass transition temperature was 95 ° C. or higher and the heat resistance was good, but the rubbery elastic modulus was higher than 10 MPa. When a fiber reinforced composite material was produced from the obtained epoxy resin composition and a tensile test was performed, the tensile strength utilization factor was 70%, which was insufficient.
- the epoxy resin composition was dissolved in acetone, made liquid, then impregnated into carbon fibers, then dried under reduced pressure, and acetone was distilled off to produce an epoxy resin-impregnated carbon fiber sheet. Thereafter, a fiber-reinforced composite material was obtained in the same manner as in the above ⁇ Method for producing fiber-reinforced composite material>.
- the tensile strength utilization factor of the obtained fiber reinforced composite material was 63%, which was insufficient.
- Example 10 An epoxy resin composition and a cured resin were produced in the same manner as in Example 1 except that the resin composition was changed to that described in Example 2 of Patent Document 7 (Japanese Patent Publication No. 2015-508125). The evaluation results are shown in Table 4.
- the resin transition product had a glass transition temperature of 165 ° C. and good heat resistance, but had a rubbery elastic modulus as high as 16 MPa.
- the tensile strength utilization factor was 67%, which was insufficient.
- Example 11 The curing component was the composition described in Example 4 (Reference 4-1) of Patent Document 9 (Japanese Patent Laid-Open No. 2014-118576), and [A ′]-2 was used as the epoxy component in the same manner as in Example 1.
- An epoxy resin composition and a cured resin were prepared.
- the evaluation results are shown in Table 4.
- the resin transition product had a glass transition temperature of 141 ° C. and good heat resistance, but had a rubbery elastic modulus as high as 14 MPa.
- the tensile strength utilization factor was 69%, which was insufficient.
- the epoxy resin composition of the present invention is suitably used for producing a fiber-reinforced composite material that achieves both heat resistance and tensile strength utilization at a high level.
- the epoxy resin composition and fiber reinforced composite material of the present invention are preferably used for sports applications, general industrial applications, and aerospace applications.
Abstract
Description
[A]3官能以上の芳香族エポキシ樹脂
[B]各アミノ基のオルト位に置換基を有する芳香族ジアミンまたは各アミノ基に結合する炭素原子に隣接する炭素原子が置換基を有するシクロアルキルジアミン
[C]アルキレングリコール構造を有する脂肪族ポリアミン
[D]炭素数6~12の直鎖または分岐鎖脂肪族ポリアミン
[A]3官能以上の芳香族エポキシ樹脂
[B]各アミノ基のオルト位に置換基を有する芳香族ジアミンまたは各アミノ基に結合する炭素原子に隣接する炭素原子が置換基を有するシクロアルキルジアミン
[C]アルキレングリコール構造を有する脂肪族ポリアミン
[D]炭素数6~12の直鎖または分岐鎖脂肪族ポリアミン。
・構成要素[A]:3官能以上の芳香族エポキシ樹脂
[A]-1 “ARALDITE(登録商標)”MY0510(N,N,O-トリグリシジル-p-アミノフェノール、ハンツマン・ジャパン(株)製)
[A]-2 “ARALDITE(登録商標)”MY721(N,N,N’,N’-テトラグリシジル-4,4’-ジアミノジフェニルメタン、ハンツマン・ジャパン(株)製)
[A]-3 “TETRAD(登録商標)”-X(N,N,N’,N’-テトラグリシジル-m-キシレンジアミン、三菱ガス化学(株)製)。
(各アミノ基のオルト位に置換基を有する芳香族ジアミン)
[B]-1 “カヤハード(登録商標)”A-A(4,4’-ジアミノ-3,3’-ジエチルジフェニルメタン、日本化薬(株)製)
[B]-2 “jERキュア(登録商標)”W(ジエチルトルエンジアミン、三菱化学(株)製)
[B]-3 2,6-ジアミノトルエン
[B]-4 “ロンザキュア(登録商標)”M-MIPA(3,3’-ジイソプロピル-5,5’-ジメチル-4,4’-ジアミノジフェニルメタン、ロンザ社製)。
(各アミノ基に結合する炭素原子に隣接する炭素原子が置換基を有するシクロアルキルジアミン)
[B]-5 “Baxxodur(登録商標)”EC331(2,2’-ジメチル-4,4’-メチレンビスシクロヘキシルアミン、BASFジャパン(株)製)。
(2-アミノプロピルエーテル構造を有する脂肪族ポリアミン)
[C]-1 “JEFFAMINE(登録商標)”D-230(ポリプロピレングリコールジアミン、ハンツマン・ジャパン(株)製)
[C]-2 “JEFFAMINE(登録商標)”D-400(ポリプロピレングリコールジアミン、ハンツマン・ジャパン(株)製)
[C]-3 “JEFFAMINE(登録商標)”T-403(ポリプロピレングリコールトリアミン、ハンツマン・ジャパン(株)製)
(2-アミノエチルエーテル構造を有する脂肪族ポリアミン)
[C]-4 “JEFFAMINE(登録商標)”EDR-148(1,8-ジアミノ-3,6-ジオキサオクタン、ハンツマン・ジャパン(株)製)
(3-アミノプロピルエーテル構造を有する脂肪族ポリアミン)
[C]-5 “JEFFAMINE(登録商標)”EDR-176(1,10-ジアミノ-4,7-ジオキサデカン、ハンツマン・ジャパン(株)製)
(上記以外の構成要素[C])
[C]-6 “JEFFAMINE(登録商標)”XTJ-568(ポリプロピレングリコールジアミン、ハンツマン・ジャパン(株)製)。
[D]-1 HMDA(ヘキサメチレンジアミン、東レ(株)製)。
[E]-1 GAN(N,N’-ジグリシジルアニリン、日本化薬(株)製)。
[A’]-1 “jER(登録商標)”828(液状ビスフェノールA型エポキシ樹脂、三菱化学(株)製)
[A’]-2 “jER(登録商標)”825(液状ビスフェノールA型エポキシ樹脂、三菱化学(株)製)
[A’]-3 “jER(登録商標)”806(液状ビスフェノールF型エポキシ樹脂、三菱化学(株)製)
[A’]-4 “オグソール(登録商標)”EG-200(フルオレン型エポキシ樹脂、大阪ガスケミカル(株)製)
[A’]-5 “HyPox(登録商標)”RA95(エラストマー変性ビスフェノールA型エポキシ樹脂、CVCスペシャリティケミカルズ社製)。
[F]-1 “Baxxodur(登録商標)”EC201(イソホロンジアミン、BASFジャパン(株)製)
[F]-2 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)
[F]-3 セイカキュア-S(4,4’-ジアミノジフェニルスルホン、セイカ(株)製)
[F]-4 4-アミノジフェニルアミン
[F]-5 ジエチレントリアミン。
[G]-1 “カネエース(登録商標)”MX-416(コアシェルゴム25質量%/“ARALDITE”MY721(構成要素[A])75質量%、カネカ(株)製)
[G]-2 DIC-TBC(4-t-ブチルカテコール、DIC(株)製)。
“トレカ(登録商標)”T700SC-12K-50C(引張強度:4.9GPa、東レ(株)製)。
ビーカー中に、構成要素[A]のエポキシ樹脂およびそれ以外のエポキシ樹脂を投入し、80℃の温度まで昇温させ30分加熱混練を行った。その後、混練を続けたまま30℃以下の温度まで降温させ、構成要素[B]および[C]または[D]のアミンを加えて10分間撹拌させることにより、エポキシ樹脂組成物を得た。
上記<エポキシ樹脂組成物の調製方法>に従い調製したエポキシ樹脂組成物の粘度を、JIS Z8803(2011)における「円すい-平板形回転粘度計による粘度測定方法」に従い、標準コーンローター(1°34’×R24)を装着したE型粘度計(東機産業(株)製、TVE-30H)を使用して、回転速度10回転/分で測定した。なお、エポキシ樹脂組成物を調製後、25℃または30℃に設定した装置に投入し、1分後の粘度を初期粘度とした。
上記<エポキシ樹脂組成物の調製方法>に従い調製したエポキシ樹脂組成物を、一方向に引き揃えたシート状にした炭素繊維“トレカ(登録商標)”T700S-12K-50C(東レ(株)製、目付150g/m2)に含浸させ、エポキシ樹脂含浸炭素繊維シートを得た。得られたシートを繊維方向が同じになるよう8枚重ねた後、金属製スペーサーにより厚み1mmになるよう設定した金型に挟み、その金型を100℃に加熱したプレス機で2時間加熱硬化を実施した。その後、プレス機から金型を取り出し、さらに150℃に加熱したオーブンで4時間加熱硬化し、繊維強化複合材料を得た。
エポキシ樹脂組成物を真空中で脱泡した後、2mm厚の“テフロン(登録商標)”製スペーサーにより厚み2mmになるように設定したモールド中で、100℃の温度で2時間硬化させた後、さらに150℃の温度で4時間硬化させ、厚さ2mmの板状の樹脂硬化物を得た。この樹脂硬化物から、幅12.7mm、長さ45mmの試験片を切り出し、粘弾性測定装置(ARES、ティー・エイ・インスツルメント社製)を用い、ねじり振動周波数1.0Hz、昇温速度5.0℃/分の条件下で、30~250℃の温度範囲でDMA測定を行い、ガラス転移温度およびゴム状態弾性率を読み取った。ガラス転移温度は、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における温度とした。また、ゴム状態弾性率は、ガラス転移温度を上回る温度領域で、貯蔵弾性率が平坦になった領域での貯蔵弾性率であり、ここではガラス転移温度から40℃上の温度での貯蔵弾性率とした。
上記<繊維強化複合材料の作製方法>に従い作製した繊維強化複合材料から、幅12.7mm、長さ229mmになるように切り出し、両端に1.2mm、長さ50mmのガラス繊維強化プラスチック製タブを接着した試験片を用い、ASTM D 3039に準拠して、インストロン万能試験機(インストロン社製)を用いてクロスヘッドスピード1.27mm/分で引張強度を測定した。サンプル数n=6で測定した値の平均値を引張強度とした。
構成要素[A]として“ARALDITE(登録商標)”MY0510を30質量部、構成要素[A]以外のエポキシ樹脂として“jER(登録商標)”806を70質量部、構成要素[B]として“jERキュア(登録商標)”Wを22.7質量部、構成要素[C]として“JEFFAMINE(登録商標)”D-230を22.7質量部用い、上記<エポキシ樹脂組成物の調製方法>に従ってエポキシ樹脂組成物を調製した。得られたエポキシ樹脂組成物の25℃における初期粘度は1430mPa・sであり、また、30℃、30分後の粘度は元の粘度の2倍以下であり粘度特性は良好であった。
樹脂組成をそれぞれ表1または2に示したように変更した以外は、実施例1と同じ方法でエポキシ樹脂組成物、エポキシ樹脂硬化物、および繊維強化複合材料を作製した。得られたエポキシ樹脂組成物は、いずれも実施例1と同様、粘度特性は良好であった。得られたエポキシ樹脂硬化物の耐熱性、ゴム状態弾性率ともに良好であった。得られた繊維強化複合材料の引張強度利用率も良好であった。
構成要素[A]を添加しなかった以外は、実施例1と同じ方法でエポキシ樹脂組成物および樹脂硬化物を作製した。樹脂組成および評価結果は表3に示した。ゴム状態弾性率が10MPa以下であり良好であったが、ガラス転移温度が95℃以下であり、耐熱性が不十分であった。
構成要素[B]を添加しなかった以外は、実施例1と同じ方法でエポキシ樹脂組成物および樹脂硬化物を作製した。樹脂組成および評価結果は表3に示した。ゴム状態弾性率が10MPa以下であり良好であったが、ガラス転移温度が95℃以下であり、耐熱性が不十分であった。
構成要素[C]を添加しなかった以外は、実施例1と同じ方法でエポキシ樹脂組成物および樹脂硬化物を作製した。樹脂組成および評価結果は表3に示した。ガラス転移温度が95℃以上であり、耐熱性は良好であったが、ゴム状態弾性率が10MPaより高かった。得られたエポキシ樹脂組成物から繊維強化複合材料を作製し、引張試験を実施したところ、引張強度利用率は68%であり、不十分であった。
樹脂組成を表3に示したように変更し、実施例1と同様にエポキシ樹脂組成物および樹脂硬化物を作製した。なお、固形のアミンは、事前に液状のアミンに溶解させてから、エポキシ樹脂と混合させた。樹脂組成および評価結果を表3に示した。ガラス転移温度が95℃以上であり、耐熱性は良好であったが、ゴム状態弾性率が10MPaより高かった。得られたエポキシ樹脂組成物から繊維強化複合材料を作製し、引張試験を実施したところ、引張強度利用率は67%であり、不十分であった。
樹脂組成を表3に示したように変更し(特表2008-508113の例3の樹脂組成に相当する)、比較例4と同様にエポキシ樹脂組成物および樹脂硬化物を作製した。樹脂組成および評価結果を表3に示した。ガラス転移温度が95℃以上であり、耐熱性は良好であったが、ゴム状態弾性率が10MPaより高かった。得られたエポキシ樹脂組成物から繊維強化複合材料を作製し、引張試験を実施したところ、引張強度利用率は70%であり、不十分であった。
構成要素[B]を添加せず、アミンとして “Baxxodur(登録商標)”EC201を用いた以外は、実施例1と同じ方法でエポキシ樹脂組成物および樹脂硬化物を作製した。樹脂組成および評価結果は表3に示した。ガラス転移温度が95℃以上であり、耐熱性は良好であったが、ゴム状態弾性率が10MPaより高かった。得られたエポキシ樹脂組成物から繊維強化複合材料を作製し、引張試験を実施したところ、引張強度利用率は63%であり、不十分であった。
特許文献8(特表2014-521824号公報)の実施例1に記載の硬化剤を参考に、構成要素[C]または[D]を添加せず、アミンとしてジエチレントリアミンを用いた。その他は、実施例1と同じ方法でエポキシ樹脂組成物および樹脂硬化物を作製した。樹脂組成および評価結果は表3に示した。ガラス転移温度が95℃以上であり、耐熱性は良好であったが、ゴム状態弾性率が10MPaより高かった。得られたエポキシ樹脂組成物から繊維強化複合材料を作製し、引張試験を実施したところ、引張強度利用率は70%であり、不十分であった。
特許文献6(特開2010-150311号公報)の実施例15に記載の樹脂組成に変更した以外は、実施例1と同じ方法でエポキシ樹脂組成物および樹脂硬化物を作製した。樹脂組成および評価結果は表3に示した。ガラス転移温度が95℃以上であり、耐熱性は良好であったが、ゴム状態弾性率が10MPaより高かった。得られたエポキシ樹脂組成物から繊維強化複合材料を作製し、引張試験を実施したところ、引張強度利用率は69%であり、不十分であった。
特許文献3(特開2001-323046号公報)の実施例6に記載の方法に従い、エポキシ樹脂組成物を作製した。評価結果は表4に示した。これを硬化させて得られた樹脂硬化物のガラス転移温度は173℃と高かったが、ゴム状態弾性率は18MPaと非常に高い値を示した。このエポキシ樹脂組成物は非常に粘度が高く、上記<繊維強化複合材料の作製方法>に示した方法ではエポキシ樹脂含浸炭素繊維シートが作製できなかった。そこで、エポキシ樹脂組成物をアセトンに溶解し、液状とせしめた後に炭素繊維に含浸させ、その後減圧乾燥してアセトンを留去することで、エポキシ樹脂含浸炭素繊維シートを作製した。以降は上記<繊維強化複合材料の作製方法>と同様にして、繊維強化複合材料を得た。得られた繊維強化複合材料の引張強度利用率は63%と、不十分であった。
特許文献7(特表2015-508125号公報)の実施例2に記載の樹脂組成に変更した以外は、実施例1と同じ方法でエポキシ樹脂組成物および樹脂硬化物を作製した。評価結果は表4に示した。樹脂硬化物のガラス転移温度が165℃であり、耐熱性は良好であったが、ゴム状態弾性率が16MPaと高かった。得られたエポキシ樹脂組成物から繊維強化複合材料を作製し、引張試験を実施したところ、引張強度利用率は67%であり、不十分であった。
硬化成分を特許文献9(特開2014-118576号公報)の実施例4(参考4-1)に記載の組成とし、エポキシ成分として[A’]-2を用い、実施例1と同じ方法でエポキシ樹脂組成物および樹脂硬化物を作製した。評価結果は表4に示した。樹脂硬化物のガラス転移温度は141℃であり、耐熱性は良好であったが、ゴム状態弾性率が14MPaと高かった。得られたエポキシ樹脂組成物から繊維強化複合材料を作製し、引張試験を実施したところ、引張強度利用率は69%であり、不十分であった。
Claims (12)
- 少なくとも次の構成要素[A]および[B]を含み、さらに構成要素[C]または[D]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硬化させた硬化物の動的粘弾性評価におけるゴム状態弾性率が10MPa以下であり、かつ該硬化物のガラス転移温度が95℃以上であることを特徴とする、エポキシ樹脂組成物。
[A]3官能以上の芳香族エポキシ樹脂
[B]各アミノ基のオルト位に置換基を有する芳香族ジアミンまたは各アミノ基に結合する炭素原子に隣接する炭素原子が置換基を有するシクロアルキルジアミン
[C]アルキレングリコール構造を有する脂肪族ポリアミン
[D]炭素数6~12の直鎖または分岐鎖脂肪族ポリアミン - 構成要素[B]が、芳香族ジアミンである、請求項1に記載のエポキシ樹脂組成物。
- 構成要素[B]が、シクロアルキルジアミンである、請求項1に記載のエポキシ樹脂組成物。
- 構成要素[C]を有する場合であって、構成要素[C]が2-アミノプロピルエーテル構造を有する脂肪族ポリアミンである、請求項1~3のいずれかに記載のエポキシ樹脂組成物。
- 構成要素[C]を有する場合であって、構成要素[C]が2-アミノエチルエーテル構造を有する脂肪族ポリアミンである、請求項1~3のいずれかに記載のエポキシ樹脂組成物。
- 構成要素[C]を有する場合であって、構成要素[C]が3-アミノプロピルエーテル構造を有する脂肪族ポリアミンである、請求項1~3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]として、置換されてもよいジグリシジルアニリンを含むことを特徴とする、請求項1~6のいずれかに記載のエポキシ樹脂組成物。
- 25℃における粘度が2000mPa・s以下であることを特徴とする請求項1~7のいずれかに記載のエポキシ樹脂組成物。
- 30℃、30分後における粘度が元の粘度の2倍以下であることを特徴とする、請求項1~8のいずれかに記載のエポキシ樹脂組成物。
- 請求項1~9のいずれかに記載のエポキシ樹脂組成物の硬化物と強化繊維とからなる繊維強化複合材料。
- 請求項10に記載の繊維強化複合材料からなる成形品。
- 請求項10に記載の繊維強化複合材料からなる圧力容器。
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