WO2022209715A1 - エポキシ樹脂組成物、プリプレグ、及びこれらを用いた繊維強化プラスチック - Google Patents
エポキシ樹脂組成物、プリプレグ、及びこれらを用いた繊維強化プラスチック Download PDFInfo
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- WO2022209715A1 WO2022209715A1 PCT/JP2022/010714 JP2022010714W WO2022209715A1 WO 2022209715 A1 WO2022209715 A1 WO 2022209715A1 JP 2022010714 W JP2022010714 W JP 2022010714W WO 2022209715 A1 WO2022209715 A1 WO 2022209715A1
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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
- C08G59/22—Di-epoxy compounds
- C08G59/24—Di-epoxy compounds carbocyclic
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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
- C08G59/62—Alcohols or phenols
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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
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
Definitions
- the present invention relates to epoxy resin compositions, reinforcing fiber-containing epoxy resin compositions, prepregs, and fiber-reinforced plastics using these.
- Fiber reinforced plastic exhibits excellent physical properties such as light weight and high strength, and is used in many fields. Among them, those using carbon fiber as a reinforcing fiber (CFRP) are known to be particularly excellent in mechanical strength.
- Epoxy resin is mainly used as the base material resin for FRP because it has an excellent balance of price and physical properties. Epoxy resins are also known to exhibit good mechanical properties as base material resins for CFRP because they form good adhesive surfaces with reinforcing fibers due to their secondary hydroxyl groups.
- thermoplastic resin as the base material resin
- FRTP thermoplastic resin
- Nylon, polypropylene, polycarbonate, etc. are mainly used as the base material resin of FRTP.
- a problem with FRTP is that the 90-degree bending strength of unidirectional materials (UD materials) is low due to the low adhesion between reinforcing fibers and resin.
- various methods are being considered for modifying the reinforcing fiber surface, such as washing the sizing agent attached to the fiber and oxidizing the fiber surface with ozone or acid.
- all require additional steps and are not convenient (Non-Patent Document 1).
- thermoplastic epoxy resin has been proposed as a thermoplastic resin that improves adhesion to reinforcing fibers. Since the in-situ polymerizable thermoplastic epoxy resin is impregnated into fibers in a low viscosity state before polymerization, it has good impregnation properties and can increase the ratio of reinforcing fibers. Also, due to the presence of the secondary hydroxyl group of the epoxy resin, good adhesion to the reinforcing fiber is expected.
- Non-Patent Document 2 the interfacial shear strength between carbon fiber and base material increases as the molecular weight of thermoplastic epoxy increases.
- thermoplastic epoxy resin it is necessary to spend a sufficient amount of time for polymerization in order to sufficiently increase the molecular weight within the reinforcing fibers of the thermoplastic epoxy resin.
- the skeleton of the thermoplastic epoxy resin is made bulky for high heat resistance, the steric hindrance of the reaction becomes large, so that the curing time for polymerization becomes longer, resulting in poor productivity. Therefore, there has been a demand for a method for improving the adhesiveness of a thermoplastic epoxy resin to reinforcing fibers and improving the flexural strength in the 90-degree direction by a simple method with excellent productivity.
- the present invention provides an epoxy resin composition comprising a bifunctional phenol compound, a bifunctional epoxy resin and a polymerization catalyst as essential components,
- a bifunctional epoxy resin containing 50% by weight or more of a bifunctional epoxy resin (a) represented by the following formula (1)
- the bifunctional epoxy resin is 1.01 to 1.05 mol per 1 mol of the bifunctional phenol compound
- the polymer obtained from the epoxy resin composition is a thermoplastic epoxy resin, and its epoxy equivalent is 5000 g/eq. 20000 g/eq. , a bending strength of 70 MPa or more, and a component that becomes insoluble when dissolved in tetrahydrofuran is 10% by weight or less in the polymer.
- a in formula (1) is represented by formula (2), n is the number of repetitions, and its average value is 0-5.
- X is a single bond, a hydrocarbon group having 1 to 13 carbon atoms, —O—, —CO—, —COO—, —S—, —SO 2 —, and Y 1 independently has 1 carbon atom; an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms, and Y 2 and Y 3 are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 10 carbon atoms. is either
- the present invention also provides a reinforcing fiber-containing epoxy resin composition or prepreg obtained by mixing the above epoxy resin composition and reinforcing fibers.
- the reinforcing fibers are preferably PAN-based carbon fibers, and are preferably contained in the resin composition or prepreg at a ratio of 50% by weight or more and 80% by weight or less.
- the present invention also provides a fiber-reinforced plastic using the reinforcing fiber-containing epoxy resin composition or the prepreg.
- the present invention can provide a thermoplastic epoxy resin composition with excellent adhesion to reinforcing fibers.
- the adhesiveness to a reinforcing fiber can be demonstrated by the simple method of adjusting the preparation ratio of a raw material.
- the epoxy resin composition of the present invention is a composition that contains a bifunctional phenol compound, a bifunctional epoxy resin and a polymerization catalyst as essential components and can be polymerized by heating. It may contain organic solvents and additives such as fillers and flame retardants.
- the bifunctional epoxy resin contains 50% by weight or more of the epoxy resin (a) represented by the formula (1) as an essential component. It is preferably 66% by weight or more, more preferably 75% by weight or more, and still more preferably 80% by weight or more.
- Epoxy resin (a) constitutes part of a bifunctional epoxy resin. Moreover, the epoxy equivalent of the bifunctional epoxy resin is 150 to 350 g/eq. is preferred.
- A is a divalent group represented by formula (2) above.
- n is the number of repetitions, and its average value is 0-5, preferably 0-1.
- X is a single bond, a hydrocarbon group having 1 to 13 carbon atoms, -O-, -CO-, -COO-, -S- or -SO 2 -.
- the hydrocarbon group having 1 to 13 carbon atoms is preferably an alkylene group having 1 to 9 carbon atoms or an arylene group having 6 to 13 carbon atoms, such as —CH 2 —, —CH(CH 3 )—, —C( CH 3 ) 2 —, —C(CF 3 ) 2 —, —CHPh—, —C(CH 3 )Ph—, 1,1-cyclopropylene group, 1,1-cyclobutylene group, 1,1-cyclopentyl rene group, 1,1-cyclohexylene group, 4-methyl-1,1-cyclohexylene group, 3,3,5-trimethyl-1,1-cyclohexylene group, 1,1-cyclooctylene group, 1, 1-cyclononylene group
- Y 1 is independently either an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms.
- alkyl groups having 1 to 4 carbon atoms include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, sec-butyl group, iso-butyl group and t-butyl group. mentioned.
- the aryl group having 6 to 10 carbon atoms include phenyl group, tolyl group, ethylphenyl group, xylyl group, n-propylphenyl group, isopropylphenyl group, mesityl group and naphthyl group.
- methyl group, ethyl group, n-propyl group, n-butyl group, t-butyl group, phenyl group, tolyl group, xylyl group or naphthyl group are preferred, and methyl group, ethyl group and n-propyl group.
- n-butyl group, t-butyl group, phenyl group, or tolyl group are more preferred.
- Y 2 is independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 10 carbon atoms, and is preferably a group other than a hydrogen atom. Examples of the alkyl group and the aryl group are the same as the groups exemplified for Y 1 above. Preferred Y2 is the same as Y1 . Y 3 is independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 10 carbon atoms. Examples of the alkyl group and aryl group are the same as the groups exemplified for Y1 . Preferred Y3 is a hydrogen atom or the same groups as those exemplified for Y1.
- bifunctional epoxy resin (a) for example, tetramethylbisphenol F type epoxy resin (eg, YSLV-80XY (manufactured by Nippon Steel Chemical & Materials Co., Ltd.), etc.), tetramethylbiphenol type epoxy resin (eg, YX-4000 (manufactured by Mitsubishi Chemical Co., Ltd.), etc.), biscresol fluorene-type epoxy resins (eg, OGSOL CG-500 (manufactured by Osaka Gas Chemicals Co., Ltd.), etc.).
- epoxy resins other than the epoxy resin (a) can be used together as long as they are bifunctional epoxy resins, and the purity thereof is preferably 95% or more. If the purity as a bifunctional epoxy resin is high, positional isomers and oligomers may be included.
- epoxy resins that can be used in combination with the epoxy resin (a) include bisphenol A-type epoxy resin, bisphenol F-type epoxy resin, bisphenol S-type epoxy resin, bisphenolacetophenone-type epoxy resin, diphenyl sulfide-type epoxy resin, diphenyl ether-type epoxy resin, and bisphenol.
- Bisphenol-type epoxy resins such as fluorene-type epoxy resins, biphenol-type epoxy resins, diphenyldicyclopentadiene-type epoxy resins, alkylene glycol-type epoxy resins, dihydroxynaphthalene-type epoxy resins, and dihydroxybenzene-type epoxy resins can be mentioned.
- the bifunctional epoxy resin that can be used in combination with the epoxy resin (a) is preferably less than 50% by weight, more preferably less than 30% by weight, of the total epoxy resin. If the content exceeds 50% by weight, gelation occurs to generate a component that is difficult to dissolve in a solvent, which may deteriorate reshaping properties.
- the content of monofunctional impurities is preferably 2% by weight or less with respect to the bifunctional epoxy resin. If tri- or higher-functional impurities are contained, a crosslinked structure is likely to be formed starting from the impurities, which may increase the dispersion of the polymer and may cause gelation to impair thermoplasticity. Therefore, it is preferable that the tri- or higher-functional impurities be 1% by weight or less relative to the difunctional epoxy resin.
- An impurity component that does not have an active group that reacts with either the epoxy resin or the phenolic hydroxyl group and that does not inhibit the polymerization reaction by itself may decrease the molecular weight after polymerization if the amount increases. Therefore, it is preferably 2% by weight or less with respect to the bifunctional epoxy resin.
- the bifunctional phenol compound used in the epoxy resin composition of the present invention is a compound having two phenolic hydroxyl groups in one molecule, and preferably has a purity of 95% by weight or more. Further, if the purity as a bifunctional phenol compound is high, positional isomers may be contained. When monofunctional impurities are contained, the molecular weight after polymerization does not increase, so that the produced thermoplastic resin may have poor mechanical properties. Therefore, the content of monofunctional impurities is preferably 2% by weight or less with respect to the bifunctional phenol compound. If tri- or higher-functional impurities are contained, a crosslinked structure is likely to be formed starting from the impurities, which may increase the dispersion of the polymer and may cause gelation to impair thermoplasticity.
- trifunctional or higher functional impurities are preferably 1% by weight or less with respect to the bifunctional phenol compound.
- An impurity component that does not have an active group that reacts with either the epoxy resin or the phenolic hydroxyl group and that does not inhibit the polymerization reaction by itself may decrease the molecular weight after polymerization if the amount increases. Therefore, it is preferably 2% by weight or less with respect to the bifunctional phenol compound.
- the bifunctional phenol compound is preferably a bisphenol compound or a biphenol compound.
- bisphenol compounds include bisphenol A, bisphenol F (manufactured by Nippon Steel Chemical & Materials Co., Ltd.), bisphenol fluorene (manufactured by Osaka Gas Chemicals Co., Ltd.), Bis-E, Bis-Z, BisOC-FL, BisP- AP, BisP-CDE, BisP-HTG, BisP-MIBK, BisP-3MZ, S-BOC (manufactured by Honshu Chemical Industry Co., Ltd.), bisphenol S and the like.
- biphenol compounds include biphenol, dimethylbiphenol, tetramethylbiphenol and the like.
- bifunctional phenol compounds examples include benzenediols such as hydroquinone, methylhydroquinone, dibutylhydroquinone, resorcinol, methylresorcinol, catechol and methylcatechol, and naphthalene diols such as naphthalene diol.
- bisphenol compounds or biphenol compounds are preferred.
- the ratio of the bifunctional epoxy resin contained in the epoxy resin composition of the present invention is 1.01 to 1.05 mol, preferably 1.02 to 1.03 mol, per 1 mol of the bifunctional phenol compound. .
- the epoxy resin and the phenol compound react successively to form a straight chain structure, thereby exhibiting thermoplasticity.
- the epoxy resin is excessive, the epoxy group terminal is formed, and when the phenol compound is excessive, the phenol group terminal is formed and the reaction is completed.
- the proportion of the epoxy resin is less than 1.01 mol, the polymer tends to have a phenol group terminal, and there is a risk that the adhesion to the reinforcing fiber will not be exhibited.
- the proportion of the epoxy resin exceeds 1.05 mol, unreacted epoxy resin components remain in the resin even after the polymerization reaction is completed, which may adversely affect the strength of the resin.
- the epoxy resin composition if the phenolic compound exists in the epoxy resin in a crystalline state, the molar ratio deviates from the design when viewed microscopically. If the reaction is started in this state, the polymerization may not progress sufficiently. In order to allow the polymerization to proceed sufficiently, an epoxy resin composition in which the phenol compound and the epoxy resin are uniformly dissolved (compatibility) with each other is preferred. In addition, it is desirable that the epoxy resin composition is completely dissolved or in a uniform liquid state before the reinforcing fibers are blended.
- the haze value in the thickness direction is measured by adding the molten mixture, if the haze value in the thickness direction is less than 30%, it is determined that the mixture has dissolved or become a uniform liquid to a level that does not affect the polymerization reaction.
- the haze value is more preferably less than 20%, still more preferably less than 10%.
- polymerization catalyst used in the epoxy resin composition known catalysts can be used. Specific examples include phosphorus-based polymerization catalysts such as triphenylphosphine, tris(paratoluyl)phosphine, tris(orthotoluyl)phosphine, and tris(paramethoxyphenyl)phosphine.
- phosphorus-based polymerization catalysts such as triphenylphosphine, tris(paratoluyl)phosphine, tris(orthotoluyl)phosphine, and tris(paramethoxyphenyl)phosphine.
- Other polymerization catalysts include imidazole compounds such as 1B2MZ, 1B2PZ and TBZ (manufactured by Shikoku Kasei Kogyo Co., Ltd.).
- the above polymerization catalyst is desirably 0.05% by weight or more and 5% by weight or less with respect to the total amount of the resin composition comprising the bifunctional epoxy resin and the bifunctional phenol compound. If the content is less than 0.05% by weight, in situ polymerization may take a long time, resulting in a decrease in productivity, and there is also a risk of deactivation for some reason before the target molecular weight is reached. If it exceeds 5% by weight, while the polymerization reaction proceeds rapidly, the storage stability may be impaired, which may cause problems with process compatibility. , there is a risk of impairing the physical properties after polymerization, and it is also economically disadvantageous because it is simply expensive.
- the epoxy resin composition may contain an organic solvent as a solvent for the polymerization catalyst or for viscosity adjustment.
- the organic solvent to be used is not particularly limited as long as it does not inhibit the reaction between the epoxy resin and the phenolic compound, but hydrocarbon-based, ketone-based, and ether-based solvents are preferred in terms of availability. Specific examples include toluene, xylene, acetone, methyl ethyl ketone, isobutyl ketone, cyclopentanone, cyclohexanone, and diethylene glycol dimethyl ether.
- the proportion of the organic solvent is desirably 5% by weight or less with respect to the total weight of the epoxy resin composition.
- the progress of the polymerization of the epoxy resin composition should be judged by the transition of the epoxy equivalent of the polymer. If the heating is performed for less than 1 hour, the epoxy equivalent tends to increase, and there is a possibility that the polymerization has not progressed sufficiently. After heating for 1 hour or more, the epoxy equivalent did not substantially increase from the value at the time of 1 hour, and it can be judged that the polymerization proceeded sufficiently. Accordingly, the polymerization conditions for obtaining a polymer from the epoxy resin composition were heating at 160° C. for 1 hour. In the present invention, the polymer for measuring the tetrahydrofuran (THF)-insoluble matter is polymerized under these conditions.
- THF tetrahydrofuran
- the progress of the polymerization of the reinforcing fiber-containing epoxy resin composition and the prepreg was also judged by the transition of the epoxy equivalent in the same way as the progress of the polymer. If the heating time is less than 4 hours, the epoxy equivalent tends to increase, and the polymerization may not proceed sufficiently. After heating for 4 hours or more, the epoxy equivalent did not substantially increase from the value obtained at 4 hours, and it was judged that the polymerization proceeded sufficiently. In the case of the epoxy resin composition in which fibers are combined, the epoxy equivalent is almost the same by setting the heating time to four times that of the epoxy resin composition alone. It is considered that this is because the reaction is suppressed in the fiber. Accordingly, the curing conditions for obtaining the fiber-reinforced plastic from the reinforcing-fiber-containing epoxy resin composition or prepreg were heating at 160° C. for 4 hours.
- the bending strength of the polymer obtained by polymerizing the epoxy resin composition of the present invention in a state that does not contain fillers or additives such as reinforcing fibers is 70 MPa or more. If the flexural strength of the polymer is below the lower limit of the range, the fiber-reinforced plastic cannot exhibit sufficient mechanical strength. The higher the strength, the better the mechanical strength of the fiber-reinforced plastic, so there is no need to specify the upper limit.
- the epoxy equivalent of the polymer obtained by polymerizing the epoxy resin composition of the present invention is 5000 g/eq. 20000 g/eq. It is below. If the epoxy equivalent of the polymer is less than the lower limit of the range, the polymer may contain a large amount of epoxy resin that has not undergone polymerization sufficiently, resulting in deterioration of mechanical strength. If the epoxy equivalent of the polymer exceeds the upper limit of the range, the terminal group becomes a phenol group, which may deteriorate the adhesiveness of the reinforcing fiber.
- the epoxy resin composition of the present invention can contain additives.
- additives include fillers such as fumed silica, flame retardants such as aluminum hydroxide and red phosphorus, modifiers such as core-shell rubber, and the like. From the viewpoint of stabilizing the polymerization reaction, it is desirable to add an additive different from the resin phase, but a plasticizer and a compatible flame retardant may be included as long as they do not affect the reaction.
- the epoxy resin composition of the present invention can be made into a thermoplastic epoxy resin by polymerizing it.
- This thermoplastic epoxy resin is excellent as a resin component for fiber-reinforced plastics.
- the reinforcing fiber-containing epoxy resin composition of the present invention is obtained by mixing or impregnating the above epoxy resin composition and reinforcing fibers. Also, the prepreg can be obtained as follows.
- An epoxy resin composition film can be obtained by applying the epoxy resin composition of the present invention to a release-treated paper or plastic film, and optionally providing a release-treated cover film.
- the release paper, release plastic film, and cover film known ones can be used, and they are not particularly limited.
- the thickness of the epoxy resin composition film is determined by the design thickness of the prepreg and the resin ratio, but the normal thickness is 1 ⁇ m or more and 300 ⁇ m or less. When the thickness is less than 1 ⁇ m, there is a problem that the opening of the fibers becomes conspicuous unless the reinforcing fibers are defibrated cleanly. It is preferably 5 ⁇ m or more and 150 ⁇ m or less, more preferably 10 ⁇ m or more and 100 ⁇ m or less.
- the reinforcing fibers used in the present invention are for reinforcing plastics such as carbon fibers, aramid fibers, and cellulose fibers, and are not particularly limited.
- the form of the fibers is not particularly limited and includes UD sheets, woven fabrics, tows, chopped fibers, non-woven fabrics, papermaking, and the like.
- the thickness of each fiber bundle is 1 mm or less, preferably 0.5 mm or less, more preferably 0.2 mm or less.
- the reinforcing fiber-containing epoxy resin composition or prepreg of the present invention is obtained from the above epoxy resin composition and/or epoxy resin composition film and reinforcing fibers.
- the weight ratio of the reinforcing fiber to the epoxy resin composition is preferably 5:5 to 8:2. If the ratio of the reinforcing fibers is too small, the strength required of the fiber-reinforced material may not be sufficiently satisfied, and if the reinforcing fibers are too large, defects such as voids may occur.
- Parts means parts by weight and “%” means % by weight unless otherwise specified.
- the raw materials, catalysts, solvents, and reinforcing fibers used in the examples are as follows.
- epoxy resin Tetramethylbiphenol type epoxy resin (Mitsubishi Chemical Corporation, YX-4000, epoxy equivalent 188)
- A2 Bisphenol A type epoxy resin (manufactured by Nippon Steel Chemical & Materials Co., Ltd., YD-8125, epoxy equivalent 173)
- [Phenolic compound] B1 Bisphenol A (manufactured by Nippon Steel Chemical & Materials Co., Ltd., hydroxyl equivalent 114)
- B2 4,4'-bis(3,3,5-trimethylcyclohexylidene) bisphenol (manufactured by Honshu Chemical Industry Co., Ltd., BisP-HTG, hydroxyl equivalent 155)
- Epoxy equivalent weight Measurement was performed in accordance with the Japanese Industrial Standards JIS K7236, and the unit was expressed as "g/eq.”. Polymers were measured as they were, and reinforcing fiber plastics were measured using the obtained resin components after extracting the resin components according to the following procedure. About 4 g of the sample was weighed into a 110 mL vial bottle, 100 mL of tetrahydrofuran (THF) was added, ultrasonic diffusion was performed at room temperature for 1 hour, and the mixture was allowed to stand at room temperature for 23 hours or more to dissolve. The obtained THF solution was filtered under reduced pressure through a 5 ⁇ m filter paper, and the filtrate was recovered. The collected filtrate was dried in a silicone vat at 20° C. for 24 hours or more, and then dried in an oven set at 110° C. for 5 hours or more to obtain a film-formed resin component.
- THF tetrahydrofuran
- Hydroxyl equivalent The measurement was performed according to the JIS K0070 standard, and the unit was expressed as "g/eq.”.
- the hydroxyl group equivalent of the phenolic resin means the phenolic hydroxyl group equivalent.
- the epoxy resin composition is placed in a colorless and transparent glass Petri dish so as to have a thickness of 2 mm, and the haze value is determined as "less than 5% ( ⁇ 5)” or “less than 10%” with reference to a haze standard plate manufactured by Murakami Color Research Laboratory. ( ⁇ 10)", “less than 20% ( ⁇ 20)”, “less than 30% ( ⁇ 30)", and "30% or more (30 ⁇ )”. If the noise value was less than 30%, it was judged that the phenolic compound was uniformly dissolved in the epoxy resin, and was judged to be ⁇ .
- the vial was dried in an oven at 100° C. for 4 hours or more.
- the dry weight of the wire mesh was subtracted from the weight of the dried sample and the wire mesh, and this was divided by the weight of the sample to determine the gel fraction in weight % and evaluated.
- the gel fraction is equal to the weight percent of THF insolubles.
- the bending strength of the polymer was measured according to JIS K7171.
- a test machine Autograph AGS-X manufactured by Shimadzu Science
- the sample had a thickness of 4 mm, a length of 100 mm, a width of 15 mm, a bending span of 70 mm, and a test speed of 1 mm/min.
- the 90-degree bending strength of the unidirectionally reinforced fiber plastic was measured according to JIS K7074.
- a test machine (Autograph AGS-X manufactured by Shimadzu Science) was used, and the sample had a thickness of 2 mm, a length of 100 mm, a width of 15 mm, a bending span of 70 mm, and a test speed of 1 mm/min. .
- Resin adhesion amount Using an SEM (JSM-7900F, manufactured by JEOL Ltd.), the cross section of the fiber-reinforced plastic after the bending test was observed to confirm the amount of resin adhered to the fiber. If the adhesion between the fiber and the resin is good, it can be confirmed that the resin is well adhered to the fiber surface of the fractured surface. 10 fibers were observed by SEM, and the number of fibers with resin adhering to 80% or more of the fiber surface was evaluated. 9 or more: ⁇ , 8 or less: ⁇
- Example 1 2913 parts of A1, 1000 parts of B1 and 1000 parts of B2 were weighed and pulverized and mixed using a Henschel mixer. Subsequently, melt-mixing is performed using an S1KRC kneader (manufactured by Kurimoto, Ltd.) preheated to a barrel temperature of 170° C., the entire amount is collected in a metal can, and cooled while stirring to obtain a precursor of the epoxy resin composition. A mixture (F1) was obtained.
- S1KRC kneader manufactured by Kurimoto, Ltd.
- the resulting epoxy resin composition (G1) was heated to about 70°C with stirring, poured into an iron chromium-plated mold container with a clearance set to 4 mm in advance, and thermally polymerized at 160°C for 60 minutes in a hot air circulating oven. was performed to obtain a polymer.
- the epoxy equivalent of the obtained polymer As a result of measuring the epoxy equivalent of the obtained polymer, it was 9900 g/eq. Met. The flexural strength of the obtained polymer was measured and found to be 87 MPa. When the gel fraction of the obtained polymer was measured, it was 1%.
- Examples 2-3, Comparative Examples 1-4 An epoxy resin composition and a polymer were obtained in the same manner as in Example 1 under the conditions shown in Table 1. The epoxy equivalent, bending strength and gel fraction of the obtained polymer were measured in the same manner as in Example 1, and the evaluation results are shown in Table 1.
- Comparative Examples 3 and 4 stirring and mixing were performed in a planetary mixer set at 60° C. instead of pulverizing and mixing using a Henschel mixer.
- the barrel temperature during melt mixing was set at 80°C.
- the obtained epoxy resin composition had a haze value of 30% or more, and the molten state of the phenolic compound was judged to be x.
- the weight gel fraction was 95%, and the epoxy equivalent was not measured because the polymer could not be dissolved in the solvent.
- Example 4 A release paper that has been subjected to a release treatment is fixed on a hot plate preheated to 70° C. so that the release surface faces upward, and the epoxy resin composition (G1) obtained in Example 1 is applied onto the release paper. After mounting, a bar coater preheated to 70° C. was used to coat the resin so that the area weight of the resin was 79 g/m 2 . Immediately after coating, the sheet was removed from the hot plate and air-cooled to obtain an epoxy resin composition sheet. Subsequently, the carbon fibers (E) are laminated on the obtained epoxy resin composition sheet so that the area weight of the fibers is 153 g / m 2 , and the surface pressure is 0 using a hot press preheated to 90 ° C.
- the vacuum press conditions are 160° C., 0.1 MPa, and 240 minutes.
- the 90-degree bending strength of the obtained unidirectionally reinforced fiber plastic was measured and found to be 86 MPa.
- the epoxy equivalent of the resin component of the obtained unidirectionally reinforced fiber plastic it was found to be 9800 g/eq. Met.
- the epoxy equivalent of the polymer is 5000 g/eq. 20000 g/eq. It can be confirmed that the 90-degree bending strength of the reinforced fiber plastic becomes 80 MPa or more when the resin strength is 70 MPa or more. From Comparative Example 5 (Comparative Example 1), it can be confirmed that when the epoxy equivalent of the polymer is high, the fiber-resin adhesion is weak, and the 90° bending strength is not sufficiently exhibited. From Comparative Examples 6 and 7 (Comparative Examples 2 and 3), it can be confirmed that unless the resin strength of the polymer is sufficiently strong, the 90-degree bending strength is not sufficiently exhibited.
- Comparative Example 4 Comparative Example 4
- a resin containing a large amount of gel component tends to have a high minimum melt viscosity during the polymerization reaction, and voids tend to remain in the CFRP molding, which is considered to have an adverse effect on the 90-degree bending strength.
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Abstract
Description
2官能エポキシ樹脂として、下記式(1)で表される2官能のエポキシ樹脂(a)を50重量%以上含み、
2官能フェノール化合物1モルに対して、2官能エポキシ樹脂は1.01~1.05モルであり、
上記エポキシ樹脂組成物より得られる重合物が、熱可塑性エポキシ樹脂であり、そのエポキシ当量が5000g/eq.以上20000g/eq.以下であり、曲げ強度が70MPa以上であり、これをテトラヒドロフランに溶解させた際に不溶となる成分が重合物中の10重量%以下であることを特徴とするエポキシ樹脂組成物である。
また、重合が十分に進んでいないなどの理由で、重合物の曲げ強度が70MPa以上であることにより、複合材料として十分な強度を発現することができる。従来、エポキシ樹脂の接着性は2級水酸基に起因されるとされており、重合物のエポキシ基濃度の影響に言及した報告はない。本発明によれば、原料の仕込み比を調整する簡便な手法により、強化繊維への接着性を発揮できる。
本発明のエポキシ樹脂組成物は、2官能フェノール化合物と2官能エポキシ樹脂及び重合触媒を必須成分として含み、加熱により重合することができる組成物である。これには有機溶剤や、充填剤、難燃剤などの添加剤が含まれていてもよい。
また、2官能エポキシ樹脂のエポキシ当量は、150~350g/eq.が好ましい。
炭素数1~13の炭化水素基としては、炭素数1~9のアルキレン基又は炭素数6~13のアリーレン基が好ましく、例えば、-CH2-、-CH(CH3)-、-C(CH3)2-、-C(CF3)2-、-CHPh-、-C(CH3)Ph-、1,1-シクロプロピレン基、1,1-シクロブチレン基、1,1-シクロペンチレン基、1,1-シクロヘキシレン基、4-メチル-1,1-シクロヘキシレン基、3,3,5-トリメチル-1,1-シクロヘキシレン基、1,1-シクロオクチレン基、1,1-シクロノニレン基、1,2-エチレン基、1,2-シクロプロピレン基、1,2-シクロブチレン基、1,2-シクロペンチレン基、1,2-シクロヘキシレン基、1,2-フェニレン基、1,3-プロピレン基、1,3-シクロブチレン基、1,3-シクロペンチレン基、1,3-シクロヘキシレン基、1,3-フェニレン基、1,4-ブチレン基、1,4-シクロヘキシレン基、1,4-フェニレン基、1,1-フルオレン基、1,2-キシリレン基、1,4-キシリレン基、テトラヒドロジシクロペンタジエニレン基、テトラヒドロトリシクロペンタジエニレン基などが挙げられる。
これらの内、単結合、-O-、-CO-、-COO-、-S-、-SO2-、-CH2-、-CH(CH3)-、-C(CH3)2-、-CHPh-、-C(CH3)Ph-、1,1-シクロヘキシレン基、4-メチル-1,1-シクロヘキシレン基、3,3,5-トリメチル-1,1-シクロヘキシレン基、1,4-シクロヘキシレン基、1,4-フェニレン基、1,1-フルオレン基が好ましく、単結合、-O-、-CO-、-COO-、-S-、-SO2-、-CH2-、-CH(CH3)-、-C(CH3)2-、-C(CH3)Ph-、1,1-シクロヘキシレン基、3,3,5-トリメチル-1,1-シクロヘキシレン基、1,1-フルオレン基がより好ましい。
なお、Phはフェニル基を表す。アルキレン基はアルキリデン基を含む意味である。
炭素数1~4のアルキル基としては、例えば、メチル基、エチル基、n-プロピル基、iso-プロピル基、n-ブチル基、sec-ブチル基、iso-ブチル基、t-ブチル基などが挙げられる。
炭素数6~10のアリール基としては、例えば、フェニル基、トリル基、エチルフェニル基、キシリル基、n-プロピルフェニル基、イソプロピルフェニル基、メシチル基、ナフチル基などが挙げられる。
これらの内、メチル基、エチル基、n-プロピル基、n-ブチル基、t-ブチル基、フェニル基、トリル基、キシリル基、又はナフチル基が好ましく、メチル基、エチル基、n-プロピル基、n-ブチル基、t-ブチル基、フェニル基、又はトリル基がより好ましい。
Y3は独立に、水素原子、炭素数1~4のアルキル基、炭素数6~10のアリール基のいずれかである。アルキル基、アリール基の例としては、Y1で例示した基と同様である。好ましいY3は水素原子又はY1で例示した基と同様である。
エポキシ樹脂(a)と併用できる2官能エポキシ樹脂は、全エポキシ樹脂中の50重量%未満であることが好ましく、30重量%未満であることが望ましい。50重量%を超えるとゲル化して溶剤に溶けにくい成分が発生するため、再賦形性が悪化する恐れがある。
3官能以上の不純物が含まれている場合には、その不純物を起点に架橋構造を形成しやすくなるため、重合物の分散が大きくなるほか、ゲル化して熱可塑性を損なう恐れがある。そのため、3官能以上の不純物については2官能エポキシ樹脂に対して1重量%以下であることが好ましい。
なお、エポキシ樹脂、フェノール性水酸基のいずれとも反応する活性基を持たず、また、単体では重合反応を阻害しない不純物成分についても、量が多くなると重合後の分子量が小さくなる恐れがある。そのため、2官能エポキシ樹脂に対して2重量%以下であることが好ましい。
1官能の不純物が含まれている場合には重合後の分子量が上がらなくなるために製造された熱可塑性樹脂の機械物性が悪くなる恐れがある。そのため、1官能の不純物は、2官能フェノール化合物に対して2重量%以下であることが好ましい。
3官能以上の不純物が含まれている場合には、その不純物を起点に架橋構造を形成しやすくなるため、重合物の分散が大きくなるほか、ゲル化して熱可塑性を損なう恐れがある。そのため、3官能以上の不純物は、2官能フェノール化合物に対して1重量%以下であることが好ましい。
なお、エポキシ樹脂、フェノール性水酸基のいずれとも反応する活性基を持たず、また、単体では重合反応を阻害しない不純物成分についても、量が多くなると重合後の分子量が小さくなる恐れがある。そのため、2官能フェノール化合物に対して2重量%以下であることが好ましい。
エポキシ樹脂の割合が1.01モル未満の場合、重合物がフェノール基末端となりやすく、強化繊維への接着性が発現しない恐れがある。
エポキシ樹脂の割合が1.05モル超の場合、重合反応終了後も未反応のエポキシ樹脂成分が樹脂中に存在することになり樹脂の強度に悪影響を及ぼす恐れがある。
また、強化繊維等を配合する前のエポキシ樹脂組成物は完全に溶解又は均一な液状となっていることが望ましいが、例えば、気泡を含まない状態でガラス製シャーレに厚さ2mmになるように溶融混合物を入れて厚み方向のヘイズ値を測定した場合において、その厚み方向のヘイズ値が30%未満であれば、重合反応に影響しない水準まで溶解又は均一な液状となったものと判断する。ヘイズ値についてより好ましくは20%未満、さらに好ましくは10%未満である。
本発明の強化繊維含有エポキシ樹脂組成物は、上記エポキシ樹脂組成物と強化繊維を混合又は含侵することにより得られる。また、プリプレグは下記のようにして得ることができる。
強化繊維とエポキシ樹脂組成物の比率は重量比で、好ましくは5:5~8:2である。強化繊維の比率が、強化繊維が少なすぎると繊維強化材料に求められる強度を十分に満足できない恐れがあり、強化繊維が多すぎるとボイドなどの欠陥が生じる恐れがある。
A1:テトラメチルビフェノール型エポキシ樹脂(三菱ケミカル株式会社製、YX-4000、エポキシ当量188)
A2:ビスフェノールA型エポキシ樹脂(日鉄ケミカル&マテリアル株式会社製、YD-8125、エポキシ当量173)
B1:ビスフェノールA(日鉄ケミカル&マテリアル株式会社製、水酸基当量114)
B2:4,4’-ビス(3,3,5-トリメチルシクロヘキシリデン)ビスフェノール(本州化学工業株式会社製、BisP-HTG、水酸基当量155)
C1:トリス(パラメトキシフェニル)ホスフィン(北興化学工業株式会社製、TPAP)
C2:2,3-ジヒドロ-1H-ピロロ-[1,2-a]ベンズイミダゾール(四国化成工業株式会社製、TBZ)
D1:シクロヘキサノン
E:PAN系炭素繊維(東レ株式会社製、T700-12K-50C)
日本工業規格JIS K7236規格に準拠して測定を行い、単位は「g/eq.」で表した。
重合物はそのまま測定を行い、強化繊維プラスチックは下記手順で樹脂成分を抽出後、得られた樹脂成分を用いて測定を行った。
110mLのバイアル瓶に試料約4gを秤量し、100mLのテトラヒドロフラン(THF)を加え、室温で超音波拡散を1時間行った後、23時間以上室温で静置して溶解した。得られたTHF溶液を5μmのろ紙で減圧濾過し、ろ液を回収した。回収したろ液をシリコンバット中で、20℃で24時間以上乾燥後、110℃に設定したオーブンで5時間以上乾燥することでフィルム化した樹脂成分を得た。
JIS K0070規格に準拠して測定を行い、単位は「g/eq.」で表した。なお、特に断りがない限り、フェノール樹脂の水酸基当量はフェノール性水酸基当量を意味する。
フェノール化合物がエポキシ樹脂中に均一に溶融しているかどうかヘイズ値により判断した。エポキシ樹脂組成物を無色透明のガラス製シャーレに厚み2mmになるように入れ、村上色彩技術研究所製のヘイズ標準板を参考に、ヘイズ値を「5%未満(<5)」「10%未満(<10)」「20%未満(<20)」「30%未満(<30)」「30%以上(30≦)」の5段階で評価した。イズ値が30%未満であれば、フェノール化合物がエポキシ樹脂中に均一に溶解していると判断し、〇とし、30%以上であれば、均一に溶解していないと判断し×とした。
100mLのバイアル瓶に試料を約1g精秤し、50mLのテトラヒドロフランを加え、室温で超音波拡散を1時間行った後、23時間以上室温で静置して溶解した。また、325メッシュの金網を100℃のオーブンで1時間乾燥し、その重量を測定した。この金網を漏斗形状に折り、試料溶液を全量漏斗の上に流し込んだ。バイアル瓶に試料の不溶解物が残らなくなるまでテトラヒドロフランで洗浄して漏斗に流し込んだ後、さらに金網上の不溶解物をテトラヒドロフランで洗浄してから100℃のオーブンで4時間以上乾燥させた。乾燥した試料と金網の重量から金網の乾燥重量を引き、これを試料重量で除してゲル分率を重量%で求めて評価した。ゲル分率はTHF不溶分の重量%に等しい。
重合物の曲げ強度については、JIS K7171に従って測定した。試験機は(島津サイエンス製オートグラフAGS-X)を使用し、サンプルの寸法は厚さ4mm、長さ100mm、幅15mmとし、曲げスパンは70mmとし、試験速度1mm/minにて試験を実施した。
一方向強化繊維プラスチックの90度方向曲げ強度については、JIS K7074に従って測定した。試験機は(島津サイエンス製オートグラフAGS-X)を使用し、サンプルの寸法は厚さ2mm、長さ100mm、幅15mmとし、曲げスパンは70mmとし、試験速度1mm/minにて試験を実施した。
SEM(日本電子社製、JSM-7900F)で、繊維強化プラスチックの曲げ試験後の断面を観察し、繊維への樹脂の付着量を確認した。繊維と樹脂の接着性がよければ、破断面の繊維表面に樹脂がよく付着していることが確認できる。SEMにより繊維10本を観察して、繊維表面の80%以上に樹脂が付着している繊維の本数で評価した。
9本以上:〇 、 8本以下:×
A1 2913部、B1 1000部、B2 1000部をそれぞれはかりとり、ヘンシェルミキサーを用いて粉砕混合した。続いてバレル温度を170℃に予熱したS1KRCニーダー(株式会社栗本鐵工所製)を用いて溶融混合を行い、金属缶に全量回収し、撹拌しながら冷却して、エポキシ樹脂組成物の前駆体混合物(F1)を得た。
得られた重合物の曲げ強度を測定した結果、87MPaであった。
得られた重合物のゲル分率を測定したところ、1%であった。
表1に記載の条件で実施例1と同様の操作でエポキシ樹脂組成物及び重合物を得た。得られた重合物のエポキシ当量、曲げ強度及びゲル分率を実施例1と同様の測定を行い、その評価結果を表1に示した。
比較例3については、溶融混合の際のバレル温度を80℃に設定した。この時、得られたエポキシ樹脂組成物のヘイズ値は30%以上であり、フェノール化合物の溶融状態は×と判断した。
また、比較例4は重量物のゲル分率が95%であり、重合物を溶剤中に溶解させられないため、エポキシ当量の測定は行わなかった。
70℃に予熱したホットプレートの上に離型処理された離型紙を、離型面が上になるように固定し、実施例1で得られたエポキシ樹脂組成物(G1)を離型紙上に乗せてから、70℃に予熱したバーコーターを用いて樹脂の面積重量が79g/m2になるように塗工した。塗工後直ちにホットプレート上から取り外し空冷して、エポキシ樹脂組成物シートを得た。
続いて、得られたエポキシ樹脂組成物シート上に、繊維の面積重量が153g/m2となるように炭素繊維(E)を貼り合わせ、90℃に予熱したホットプレスを用いて面圧が0.5MPaになるように圧力を加え、1分後に取り出して空冷して、Rc=34%のプリプレグを得た。
さらに、得られたプリプレグを繊維の配向方向を同一にして13枚積層した後、離型フィルムで挟み込み、真空プレスにより一方向繊維強化プラスチックを得た。なお、真空プレスの条件は160℃、0.1MPa、240分である。
比較例5(比較例1)より、重合物のエポキシ当量が高いと繊維-樹脂の接着が弱く、90度曲げ強度が十分に発現しないことが確認できる。
比較例6,7(比較例2,3)より、重合物の樹脂強度が十分に強くないと90度曲げ強度が十分に発現しないことが確認できる。
比較例8(比較例4)より、重合物中に不溶成分が多いと、90度曲げ強度が十分に発現しないことが確認できる。ゲル成分を多く含む樹脂は重合反応中の最低溶融粘度が高くなる傾向にあり、CFRP成型物としてボイドが残留しやすくなり、90度曲げ強度に悪影響を与えたと考えられる。
Claims (7)
- 2官能フェノール化合物、2官能エポキシ樹脂及び重合触媒を必須成分として含むエポキシ樹脂組成物であって、
2官能エポキシ樹脂は、下記式(1)で表される2官能のエポキシ樹脂(a)を50重量%以上含み、
2官能フェノール化合物と2官能エポキシ樹脂の配合比は、2官能フェノール化合物1モルに対して、2官能エポキシ樹脂は1.01~1.05モルであり、
前記エポキシ樹脂組成物より得られる重合物が熱可塑性エポキシ樹脂であり、エポキシ当量が5000g/eq.以上20000g/eq.以下であり、曲げ強度が70MPa以上であり、テトラヒドロフランに溶解させた際に不溶となる成分が10重量%以下であることを特徴とするエポキシ樹脂組成物。
ここで、Aは式(2)で表される2価の基であり、nは繰り返し数であり、その平均値は0~5である。Xは単結合、炭素数1~13の炭化水素基、-O-、-CO-、-COO-、-S-、又は-SO2-であり、Y1は独立に、炭素数1~4のアルキル基、又は炭素数6~10のアリール基であり、Y2及びY3はそれぞれ独立に、水素原子、炭素数1~4のアルキル基、又は炭素数6~10のアリール基である。 - 請求項1に記載のエポキシ樹脂組成物と強化繊維を含むことを特徴とする強化繊維含有エポキシ樹脂組成物。
- 強化繊維としてPAN系の炭素繊維を50重量%以上80重量%以下の割合で含む請求項2に記載の強化繊維含有エポキシ樹脂組成物。
- 請求項1に記載のエポキシ樹脂組成物と強化繊維を含む混合物からなることを特徴とするプリプレグ。
- 強化繊維としてPAN系の炭素繊維を、50重量%以上80重量%以下の割合で含む請求項4に記載のプリプレグ。
- 請求項4又は5に記載のプリプレグを用いた繊維強化プラスチック。
- 請求項2又は3に記載の強化繊維含有エポキシ樹脂組成物を用いた繊維強化プラスチック。
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| WO2017094633A1 (ja) * | 2015-12-01 | 2017-06-08 | 新日鉄住金マテリアルズ株式会社 | 現場重合型熱可塑性プリプレグ、熱可塑性コンポジット及びその製造方法 |
| JP2020176188A (ja) * | 2019-04-17 | 2020-10-29 | 日本化薬株式会社 | 硬化性樹脂組成物およびその硬化物 |
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| JP5233329B2 (ja) | 2007-03-13 | 2013-07-10 | Dic株式会社 | 熱硬化性ポリイミド樹脂組成物 |
| JP6183918B2 (ja) | 2012-06-12 | 2017-08-23 | 新日鉄住金化学株式会社 | ポリヒドロキシポリエーテル樹脂、ポリヒドロキシポリエーテル樹脂の製造方法、そのポリヒドロキシポリエーテル樹脂を含有する樹脂組成物、及びそれから得られる硬化物 |
| JP6159548B2 (ja) | 2013-03-27 | 2017-07-05 | 新日鉄住金化学株式会社 | エポキシ樹脂組成物、樹脂シート及びエポキシ樹脂硬化物 |
| KR20150139835A (ko) * | 2013-03-29 | 2015-12-14 | 제이엑스 닛코닛세키에너지주식회사 | 프리프레그, 섬유 강화 복합 재료 및 입자 함유 수지 조성물 |
| JP6722485B2 (ja) | 2016-03-24 | 2020-07-15 | 日鉄ケミカル&マテリアル株式会社 | ビスフェノールf骨格含有フェノキシ樹脂、その製造方法、及びそれを用いた樹脂組成物 |
| JP7063021B2 (ja) * | 2017-03-24 | 2022-05-09 | 東レ株式会社 | プリプレグおよび炭素繊維強化複合材料 |
| JP7055664B2 (ja) | 2018-02-26 | 2022-04-18 | 日鉄ケミカル&マテリアル株式会社 | リン含有フェノキシ樹脂、その樹脂組成物、及び硬化物 |
| JP2020125471A (ja) | 2019-02-06 | 2020-08-20 | 日鉄ケミカル&マテリアル株式会社 | フェノキシ樹脂及びその製造方法、その樹脂組成物並びに硬化物 |
| JP2020143191A (ja) * | 2019-03-04 | 2020-09-10 | 日立化成株式会社 | エポキシ樹脂、エポキシ樹脂組成物、エポキシ樹脂硬化物及び複合材料 |
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| WO2008018364A1 (en) * | 2006-08-07 | 2008-02-14 | Nippon Steel Chemical Co., Ltd. | Prepreg, laminate and printed wiring board |
| JP2011144319A (ja) * | 2010-01-18 | 2011-07-28 | Nippon Steel Chem Co Ltd | スルホン基含有ポリヒドロキシポリエーテル樹脂、該樹脂を含有する樹脂組成物、該樹脂を含有する硬化性樹脂組成物、及びそれらから得られるフィルム |
| JP2014005345A (ja) * | 2012-06-22 | 2014-01-16 | Nippon Steel & Sumikin Chemical Co Ltd | 高分子量エポキシ樹脂、それを用いた樹脂組成物および硬化物 |
| WO2017094633A1 (ja) * | 2015-12-01 | 2017-06-08 | 新日鉄住金マテリアルズ株式会社 | 現場重合型熱可塑性プリプレグ、熱可塑性コンポジット及びその製造方法 |
| JP2020176188A (ja) * | 2019-04-17 | 2020-10-29 | 日本化薬株式会社 | 硬化性樹脂組成物およびその硬化物 |
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| JP7742462B2 (ja) | 2025-09-19 |
| JP7587683B2 (ja) | 2024-11-20 |
| CN116829617A (zh) | 2023-09-29 |
| TW202300551A (zh) | 2023-01-01 |
| JP2024160393A (ja) | 2024-11-13 |
| JPWO2022209715A1 (ja) | 2022-10-06 |
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