WO2015137206A1 - サイジング剤塗布強化繊維、サイジング剤塗布強化繊維の製造方法、プリプレグおよび繊維強化複合材料 - Google Patents
サイジング剤塗布強化繊維、サイジング剤塗布強化繊維の製造方法、プリプレグおよび繊維強化複合材料 Download PDFInfo
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- WO2015137206A1 WO2015137206A1 PCT/JP2015/056330 JP2015056330W WO2015137206A1 WO 2015137206 A1 WO2015137206 A1 WO 2015137206A1 JP 2015056330 W JP2015056330 W JP 2015056330W WO 2015137206 A1 WO2015137206 A1 WO 2015137206A1
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- 125000003566 oxetanyl group Chemical group 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 125000000466 oxiranyl group Chemical group 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N p-toluenesulfonic acid Substances CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
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- 150000003003 phosphines Chemical class 0.000 description 1
- 150000004714 phosphonium salts Chemical group 0.000 description 1
- 125000005499 phosphonyl group Chemical group 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
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- 229920002627 poly(phosphazenes) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002859 polyalkenylene Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
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- 229920000768 polyamine Polymers 0.000 description 1
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- 229920001748 polybutylene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 150000004291 polyenes Chemical class 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
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- 239000009719 polyimide resin Substances 0.000 description 1
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- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
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- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 229960000380 propiolactone Drugs 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 125000005372 silanol group Chemical group 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 229910021647 smectite Inorganic materials 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
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- 239000008107 starch Substances 0.000 description 1
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- 150000003431 steroids Chemical class 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- DIRLEDPEXJLCIL-JCWBWLHSSA-N succinyl-β-cyclodextrin Chemical compound OC(=O)CCC(=O)OC[C@H]([C@H]([C@H]([C@@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](COC(=O)CCC(O)=O)[C@H]([C@H]([C@@H]3O)O)O[C@H]3O[C@H](COC(=O)CCC(O)=O)[C@H]([C@H]([C@@H]3O)O)O[C@H]3O[C@H](COC(=O)CCC(O)=O)[C@H]([C@H]([C@@H]3O)O)O[C@H]3O[C@H](COC(=O)CCC(O)=O)[C@H]([C@H]([C@@H]3O)O)O3)[C@@H](O)[C@@H]2O)COC(=O)CCC(=O)C)O[C@@H]1O[C@H]1[C@@H](O)[C@H](O)[C@@H]3O[C@@H]1COC(=O)CCC(O)=O DIRLEDPEXJLCIL-JCWBWLHSSA-N 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 125000000475 sulfinyl group Chemical group [*:2]S([*:1])=O 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 125000002088 tosyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C([H])([H])[H])S(*)(=O)=O 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- TUQOTMZNTHZOKS-UHFFFAOYSA-N tributylphosphine Chemical compound CCCCP(CCCC)CCCC TUQOTMZNTHZOKS-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 1
- RKBCYCFRFCNLTO-UHFFFAOYSA-N triisopropylamine Chemical compound CC(C)N(C(C)C)C(C)C RKBCYCFRFCNLTO-UHFFFAOYSA-N 0.000 description 1
- DSDAICPXUXPBCC-MWDJDSKUSA-N trimethyl-β-cyclodextrin Chemical compound COC[C@H]([C@H]([C@@H]([C@H]1OC)OC)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O[C@H]3O[C@H](COC)[C@H]([C@@H]([C@H]3OC)OC)O3)[C@H](OC)[C@H]2OC)COC)O[C@@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@@H]3O[C@@H]1COC DSDAICPXUXPBCC-MWDJDSKUSA-N 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
-
- 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
- C08J5/248—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using pre-treated fibres
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/11—Compounds containing epoxy groups or precursors thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/165—Ethers
- D06M13/17—Polyoxyalkyleneglycol ethers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives thereof
- D06M15/03—Polysaccharides or derivatives thereof
- D06M15/11—Starch or derivatives thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/507—Polyesters
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/53—Polyethers
-
- 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
- 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
-
- 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
- C08J2481/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen, or carbon only; Polysulfones; Derivatives of such polymers
- C08J2481/06—Polysulfones; Polyethersulfones
-
- 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
- C08J2487/00—Characterised by the use of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/40—Fibres of carbon
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/40—Reduced friction resistance, lubricant properties; Sizing compositions
Definitions
- the present invention relates to a sizing agent-coated reinforcing fiber, a sizing agent-coated reinforcing fiber manufacturing method, a prepreg, and a fiber-reinforced composite material, which constitute a fiber-reinforced composite material having excellent adhesive strength with a matrix resin and high mechanical strength. is there.
- fiber reinforced composite materials are widely used in general industrial fields such as office equipment, computer applications (IC trays, notebook PC cases, etc.), and automobile applications.
- the demand is increasing year by year.
- metal fibers such as aluminum fibers and stainless fibers, organic fibers such as aramid fibers and PBO fibers, inorganic fibers such as silicon carbide fibers, and carbon fibers are used.
- Carbon fiber is suitable from the viewpoint of the balance of specific strength, specific rigidity and lightness, and among them, polyacrylonitrile-based carbon fiber is suitably used.
- phenol resin, melamine resin, bismaleimide resin, unsaturated polyester resin, epoxy resin and the like are preferably used.
- an epoxy resin is particularly preferably used for the purpose of increasing such interfacial adhesion and providing a fiber-reinforced composite material having a high mechanical strength.
- Patent Documents 1 and 2 For example, a method of applying diglycidyl ether of bisphenol A as a sizing agent to carbon fibers has been proposed (Patent Documents 1 and 2). Further, a method of applying an epoxy adduct of polyalkylene glycol as a sizing agent to carbon fibers has been proposed (Patent Documents 3, 4, and 5).
- the fiber reinforced composite material is a heterogeneous material, there is a large difference between the physical properties in the arrangement direction of the reinforcing fibers and the physical properties in other directions.
- the impact resistance indicated by resistance to falling weight impact is governed by delamination strength, that is, interlayer toughness such as G Ic (opening mode) and G IIc (in-plane shear mode).
- a carbon fiber reinforced composite material using a thermosetting resin as a matrix resin reflects the low toughness of the matrix resin and has the property of being easily destroyed by stresses from other than the direction of the carbon fibers that are reinforcing fibers. Yes.
- an object of the present invention is to use a sizing agent-coated reinforcing fiber that exhibits high toughness in a fiber-reinforced composite material, a method for producing the sizing agent-coated reinforcing fiber, and the reinforcing fiber It is to provide a fiber reinforced composite material.
- the present inventors have found that the toughness of a fiber-reinforced composite material using the reinforcing fiber can be improved by applying a sizing agent containing polyrotaxane to the reinforcing fiber, and have arrived at the present invention.
- the present invention is a sizing agent-coated reinforcing fiber obtained by coating a reinforcing fiber with a sizing agent containing polyrotaxane.
- the polyrotaxane is arranged at both ends of the cyclic molecule, the linear molecule that is included in the circular molecule in a skewered manner, and the linear molecule so that the cyclic molecule is not detached from the linear molecule. It has a blocking group.
- the present invention also relates to a method for producing a sizing agent-coated reinforcing fiber by applying a sizing agent containing polyrotaxane to a reinforcing fiber and then heat-treating the sizing agent in the step of applying the sizing agent.
- the sizing agent application is performed at a temperature range of 160 to 260 ° C. for 30 to 600 seconds, with 0.1 to 10 parts by mass based on 100 parts by mass of the reinforcing fiber applied with sizing agent.
- the manufacturing method of a reinforced fiber is included.
- the present invention also includes a prepreg composed of a reinforcing fiber coated with the above sizing agent and a thermosetting resin.
- the present invention also includes a fiber reinforced composite material obtained by curing the above prepreg.
- the present invention also includes a fiber-reinforced composite material composed of the above-described sizing agent-coated reinforcing fiber and a thermosetting resin.
- the present invention is a sizing agent-coated reinforcing fiber obtained by coating a reinforcing fiber with a sizing agent containing polyrotaxane.
- the sizing agent used in the present invention needs to contain a polyrotaxane.
- a polyrotaxane is a compound having a structure in which a blocking group is arranged at both ends of a pseudopolyrotaxane in which an opening of a cyclic molecule is skewered by a linear molecule so that the cyclic molecule is not detached. Since polyrotaxane has specific functions and properties, application to various technical fields has been studied in recent years. For example, Japanese Patent Application Laid-Open No. 2008-1997 proposes a technique for improving the stretchability, washing resistance, wrinkle resistance and the like of a fiber material using a polyrotaxane material.
- a sizing agent containing a polyrotaxane to reinforcing fibers, it is possible to impart high elongation and toughness properties to the reinforcing fiber / matrix resin interface. It has been found that a fiber-reinforced composite material having a high degree of toughness can be provided during interlaminar fracture. Below, each structure of the polyrotaxane contained in the sizing agent of this invention is demonstrated.
- the cyclic molecule used for the polyrotaxane is not particularly limited as long as it is a molecule in which a linear molecule can be included in a skewered manner in the opening.
- the cyclodextrin may be a cyclodextrin derivative.
- the type of cyclodextrin or cyclodextrin derivative is not particularly limited, but is preferably selected from ⁇ -cyclodextrin, ⁇ -cyclodextrin, ⁇ -cyclodextrin, and derivatives thereof.
- the cyclodextrin derivative is introduced by substituting a polymer chain and / or a substituent on the hydroxyl group of cyclodextrin.
- the dispersibility of the polyrotaxane in the sizing agent can be adjusted. It can.
- examples of such a polymer chain include polyethylene glycol, polypropylene glycol, polyethylene, polypropylene, polyvinyl alcohol, polyacrylic acid ester, polylactone, and polylactam.
- examples of the substituent include a hydroxyl group, thionyl group, amino group, sulfonyl group, phosphonyl group, acetyl group, methyl group, ethyl group, propyl group, isopropyl group and other alkyl groups, trityl group, tosyl group, and trimethyl.
- a silane group, a phenyl group, etc. are mentioned.
- the other component of the sizing agent or the solvent in which the sizing agent is dissolved is a hydrophilic compound, it is preferable to introduce a hydrophilic polymer chain or a substituent.
- the other component of the sizing agent or the solvent in which the sizing agent is dissolved is a hydrophobic compound
- the cyclodextrin is modified with a polymer chain.
- the polymer chain preferably includes a bond selected from —O— bond and —NH— bond, and a group selected from an alkylene group and an alkenylene group.
- the alkylene group preferably has 1 to 20 carbon atoms, and more preferably 2 to 12 carbon atoms.
- the alkenylene group preferably has 2 to 20 carbon atoms, and more preferably 2 to 12 carbon atoms.
- Examples of such polymer chains include polyalkylene glycol, polyalkenylene glycol, polyalkyleneimine, polylactone, polylactam and the like.
- Preferable specific examples include polyethylene glycol, polypropylene glycol, polyethyleneimine, poly ⁇ -propiolactone, poly ⁇ -valerolactone, poly ⁇ -caprolactone, poly ⁇ -caprolactam, polylauryl lactam and the like.
- a part of hydrogen of the alkylene or alkenylene group is substituted with at least one selected from the group consisting of an acyl group such as a hydroxyl group, a carboxyl group and an acetyl group, an olefin group such as a phenyl group, a halogen atom and an allyl group. It may be.
- the linear molecule of the polyrotaxane is not particularly limited as long as it can be included in a skewered manner in the opening of the cyclic molecule.
- linear molecules polyvinyl alcohol, polyvinyl pyrrolidone, poly (meth) acrylic acid, cellulose resins (carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, etc.), polyacrylamide, polyethylene glycol, polypropylene glycol, polyvinyl acetal resins , Polyvinyl methyl ether, polyamine, polyethyleneimine, casein, gelatin, starch, and copolymers thereof; polyolefin resins such as polyethylene and polypropylene; polyester resins; polyvinyl chloride resins; polystyrene, acrylonitrile-styrene copolymer resins, etc.
- Polystyrene resin polymethyl methacrylate, (meth) acrylic acid ester copolymer, acrylonitrile-methyl Acrylic resin such as acrylate copolymer resin; Polycarbonate resin; Polyurethane resin; Vinyl chloride-vinyl acetate copolymer resin; Polyvinyl butyral resin etc .; Polyisobutylene; Polytetrahydrofuran; Polyaniline; Acrylonitrile-butadiene-styrene copolymer (ABS resin) Polyamides such as nylon, polyimides, polydienes such as polyisoprene and polybutadiene, polysiloxanes such as polydimethylsiloxane, polysulfones, polyimines, polyacetic anhydrides, polyureas, polysulfides, and polyphosphazenes Polyketones; polyphenylenes; polyhaloolefins; and derivatives of these resins.
- ABS resin Acrylonitrile-buta
- polyethylene glycol polyisoprene, polyisobutylene, polybutadiene, polypropylene glycol, polytetrahydrofuran, polydimethylsiloxane, polyethylene, polypropylene, polyvinyl alcohol and A linear molecule selected from the group consisting of polyvinyl methyl ether is preferred, and polyethylene glycol is particularly preferred.
- the linear molecule of polyrotaxane preferably has a weight average molecular weight of 15,000 or more, more preferably 17,000 or more. Moreover, it is preferable that a weight average molecular weight is 30,000 or less, and it is more preferable that it is 25,000 or less.
- the weight average molecular weight is determined based on the retention time (retention capacity) of standard polystyrene having a known molecular weight measured under the same conditions as the retention time (retention capacity) measured using a gel permeation chromatograph (GPC). It can be calculated in terms of molecular weight.
- the polyrotaxane slide ring is formed by the cyclic molecule sliding on the linear molecule when the sizing-coated reinforcing fiber is used as a matrix resin and a composite material.
- the effect is particularly excellent, and the physical properties of the fiber-reinforced composite material are particularly improved.
- the weight average molecular weight of the linear molecule is 30,000 or less, the interaction between the polyrotaxane and the matrix resin is optimized, and the physical properties of the fiber-reinforced composite material are particularly improved.
- ⁇ Inclusion amount> When a plurality of cyclic molecules include a linear molecule in a skewered manner, when the maximum amount of cyclic molecules included in one linear molecule is 1, the cyclic molecule is 0.001-0.
- the linear molecules should be included in an amount in the range of .6, preferably 0.01 to 0.5, more preferably 0.05 to 0.4.
- the maximum inclusion amount of the cyclic molecule can be calculated from the length of the linear molecule and the thickness of the cyclic molecule.
- the maximum inclusion amount is experimentally determined (see Macromolecules 1993, 26, 5698-5703). The contents of this document are all incorporated herein.
- the blocking group of the polyrotaxane is not particularly limited as long as it is a group that is arranged at both ends of the linear molecule and acts so as not to leave the cyclic molecule.
- a group selected from is preferred.
- the substituent include alkyl groups such as methyl groups, alkyloxy groups such as methoxy groups, hydroxy groups, halogen groups, cyano groups, sulfonyl groups, carboxyl groups, amino groups, and phenyl groups. It is not limited to these. One or more substituents may be present.
- the blocking group is more preferably a group selected from the group consisting of dinitrophenyl groups, cyclodextrins, adamantane groups, trityl groups, fluoresceins, and pyrenes, more preferably an adamantane group or a trityl group. is there.
- a cyclic molecule is an ⁇ -cyclodextrin derivative having a polymer chain containing ⁇ -caprolactone as a monomer unit, and a polyrotaxane whose linear molecule is polyethylene glycol is a good sizing agent.
- a polyrotaxane whose linear molecule is polyethylene glycol is a good sizing agent.
- Specific examples of such compound products include “Celum®” superpolymer SH1310P, “Celum®” superpolymer SH2400P, “Celum®” superpolymer SH3400P (all of which are advanced soft materials). Etc.).
- “Celum (registered trademark)” superpolymer SH2400P whose linear molecule is polyethylene glycol having a weight average molecular weight of 20,000 can be preferably used.
- the sizing agent can contain a compound that promotes cross-linking of the polyrotaxane molecules.
- the compound that promotes crosslinking include a compound having a plurality of reactive groups that react with an active group of a cyclic molecule of polyrotaxane.
- the plurality of reactive groups each crosslink by reacting with an active group with a plurality of polyrotaxanes to form chemical bonds.
- Examples of the reactive group include an isocyanate group, a thioisocyanate group, an oxirane group, an oxetane group, a carbodiimide group, a silanol group, an oxazoline group, and an aziridine group.
- An isocyanate group or a thioisocyanate group is more preferable, and an isocyanate group is more preferable.
- the compound having a plurality of the above reactive groups include polyether, polyester, polysiloxane, polycarbonate, poly (meth) acrylate, polyene or copolymers thereof, or both ends of the above reaction. Mention may be made of compounds modified by groups.
- a product in which polyrotaxane and a compound that promotes crosslinking are mixed is also commercially available.
- Specific examples of such products include “Celum (registered trademark)” elastomer SH3400S, “Celum (registered trademark)” elastomer SH3400M, and “Celum (registered trademark)” elastomer SH3400H (all manufactured by Advanced Soft Materials Co., Ltd.). ) And the like.
- the sizing agent further contains a compound having an epoxy group in addition to the polyrotaxane.
- the epoxy group interacts with the surface functional group of the reinforcing fiber to improve adhesion with the surface of the reinforcing fiber, and has high interaction and reactivity with the matrix resin, particularly the epoxy resin.
- the compound having an epoxy may be an aliphatic epoxy compound or an aromatic epoxy compound. These compounds can be used alone or in combination of two or more. Specific examples of the compound having an epoxy include a glycidyl ether type epoxy compound derived from a polyol, a glycidyl amine type epoxy compound derived from an amine having a plurality of active hydrogens, a glycidyl ester type epoxy compound derived from a polycarboxylic acid, And an epoxy compound obtained by oxidizing a compound having a plurality of double bonds in the molecule.
- Examples of the glycidyl ether type epoxy compound include bisphenol A, bisphenol F, bisphenol AD, bisphenol S, tetrabromobisphenol A, phenol novolac, cresol novolac, hydroquinone, resorcinol, 4,4′-dihydroxy-3,3 ′, 5. , 5'-tetramethylbiphenyl, 1,6-dihydroxynaphthalene, 9,9-bis (4-hydroxyphenyl) fluorene, tris (p-hydroxyphenyl) methane, and tetrakis (p-hydroxyphenyl) ethane and epichlorohydride
- Examples include glycidyl ether type epoxy compounds obtained by reaction with phosphorus.
- glycidyl ether type epoxy compound obtained by the reaction of epichlorohydrin.
- the epoxy compound include
- Examples of the glycidylamine type epoxy compound include N, N-diglycidylaniline, N, N-diglycidyl-o-toluidine, 1,3-bis (aminomethyl) cyclohexane, m-xylenediamine, m-phenylenediamine, 4 4,4'-diaminodiphenylmethane and 9,9-bis (4-aminophenyl) fluorene.
- epoxy compounds obtained by reacting both the hydroxyl group and amino group of aminophenols of m-aminophenol, p-aminophenol, and 4-amino-3-methylphenol with epichlorohydrin are mentioned. It is done.
- glycidyl ester type epoxy compound examples include glycidyl ester type epoxy compounds obtained by reacting phthalic acid, terephthalic acid, hexahydrophthalic acid, and dimer acid with epichlorohydrin.
- Examples of the epoxy compound obtained by oxidizing a compound having a plurality of double bonds in the molecule include an epoxy compound having an epoxycyclohexane ring in the molecule and epoxidized soybean oil.
- epoxy compounds such as triglycidyl isocyanurate can be mentioned.
- combined from the epoxy compound mentioned above as a raw material for example, the epoxy compound synthesize
- an epoxy compound having one or more epoxy groups and one or more functional groups selected from an amide group, an imide group, a urethane group, a urea group, a sulfonyl group, and a sulfo group is used as the epoxy compound. You can also.
- Examples of the compound having an epoxy group and an amide group include glycidyl benzamide and an amide-modified epoxy compound.
- the amide-modified epoxy compound can be obtained by reacting an epoxy group of an epoxy compound having two or more epoxy groups with a carboxyl group of a dicarboxylic acid amide.
- Examples of the compound having an epoxy group and an imide group include glycidyl phthalimide. Specific examples include “Denacol (registered trademark)” EX-731 (manufactured by Nagase ChemteX Corporation).
- Examples of the compound having an epoxy group and a urethane group include a urethane-modified epoxy compound.
- ADEKA RESIN registered trademark
- EPU-78-13S, EPU-6, EPU-11, EPU-15, EPU-16A, EPU-16N, EPU-17T-6, EPU-1348 and EPU-1395 (Made by ADEKA Corporation).
- the terminal hydroxyl group of polyethylene oxide monoalkyl ether is reacted with a polyvalent isocyanate compound having a reaction equivalent to the amount of the hydroxyl group, and then the isocyanate residue of the obtained reaction product is reacted with the hydroxyl group in the polyvalent epoxy compound.
- the compound obtained by is mentioned.
- polyvalent isocyanate compound used 2,4-tolylene diisocyanate, metaphenylene diisocyanate, paraphenylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, norbornane diisocyanate, triphenylmethane triisocyanate and biphenyl-2 4,4′-triisocyanate and the like.
- Examples of the compound having an epoxy group and a urea group include a urea-modified epoxy compound.
- the urea-modified epoxy compound can be obtained by reacting the epoxy group of an epoxy compound having two or more epoxy groups with the carboxyl group of the dicarboxylic acid urea.
- Examples of the compound having an epoxy group and a sulfonyl group include a bisphenol S-type epoxy compound.
- Examples of the compound having an epoxy group and a sulfo group include p-toluenesulfonic acid glycidyl compound and 3-nitrobenzenesulfonic acid glycidyl compound.
- the epoxy value of the epoxy-containing compound is preferably 2.0 meq / g or more.
- the epoxy value of the epoxy compound is 2.0 meq / g or more, an interaction with the carbon fiber is formed at a high density, and the adhesion between the carbon fiber and the matrix resin is further improved.
- the upper limit of the epoxy value is not particularly limited, but 8.0 meq / g is sufficient from the viewpoint of adhesiveness because the interaction with the reinforcing fiber is reinforced. More preferably, the epoxy value of the epoxy compound is 3.0 to 7.0 meq / g.
- the compound having an epoxy group is preferably a compound selected from a polyether type polyepoxy compound and a polyol type polyepoxy compound having two or more epoxy groups in the molecule from the viewpoint of high adhesiveness.
- the adhesion is further strengthened by increasing the interaction with the functional groups on the surface of the reinforcing fiber.
- the interaction with the functional group on the surface of the reinforcing fiber is strengthened, so that the physical properties of the obtained fiber-reinforced composite material are improved.
- the compound having an epoxy is a glycidyl ether type epoxy obtained by reaction of at least one compound selected from glycerin, diglycerin, polyglycerin, trimethylolpropane, pentaerythritol, sorbitol, and arabitol with epichlorohydrin. More preferably, it is a compound. Since these compounds have flexible molecular chains, the interaction with the functional group on the surface of the reinforcing fiber is further increased, and the physical properties of the fiber-reinforced composite material are further improved.
- products of these compounds include polyglycerin polyglycidyl ether (eg, “Denacol (registered trademark)” EX-512, EX-521 manufactured by Nagase ChemteX Corporation), trimethylolpropane polyglycidyl ether (eg, "Denacol (registered trademark) EX-321” manufactured by Nagase ChemteX Corporation, glycerin polyglycidyl ether (for example, "Denacol (registered trademark)” EX-313, EX-314 manufactured by Nagase ChemteX Corporation) ), Sorbitol polyglycidyl ether (for example, “Denacol (registered trademark)” EX-611, EX-612, EX-614, EX-614B, EX-622 manufactured by Nagase ChemteX Corporation), pentaerythritol polyglycidyl ether (For example, Nagase ChemteX
- the content ratio of the polyrotaxane in the sizing agent is preferably 5% by mass or more, more preferably 10% by mass or more, and further preferably 15% by mass or more with respect to the total amount of the sizing agent.
- the content ratio of the polyrotaxane is 5% by mass or more, the high elongation and high toughness properties of the polyrotaxane are more effectively expressed when the fiber reinforced composite material is obtained.
- the content rate of a polyrotaxane is 80 mass% or less with respect to the sizing agent whole quantity, More preferably, it is 50 mass% or less, More preferably, it is 40 mass% or less.
- the content ratio of the polyrotaxane is 80% by mass or less, the plasticity of the polyrotaxane acts appropriately on the matrix resin, and the tensile strength of the fiber reinforced composite material tends to be higher.
- the compound having an epoxy group in the sizing agent is preferably contained in an amount of 20% by mass or more, more preferably 50% by mass or more, and further preferably 60% by mass or more based on the total amount of the sizing agent. Moreover, it is preferable that the compound which has an epoxy group in a sizing agent is contained in the ratio of 95 mass% or less with respect to the sizing agent whole quantity, More preferably, it is 90 mass% or less, More preferably, it is 85 mass% or less. .
- the content ratio of the compound having a polyrotaxane and an epoxy group in the sizing agent was obtained by immersing the sizing agent-coated reinforcing fiber in a solvent and performing ultrasonic cleaning to elute the polyrotaxane and the compound having an epoxy group, and the eluted polyrotaxane and It can obtain
- the solvent for example, acetone, N, N-dimethylformamide, acetonitrile, dichloromethane, chloroform, and a mixture thereof can be preferably used.
- polyrotaxane and the compound having an epoxy group can be quantified by gas chromatography, liquid chromatography, nuclear magnetic resonance spectroscopy (NMR), oxidation-reduction titration method, acid-base titration method, or the like.
- the sizing agent may contain components other than those described above.
- auxiliary components such as an adhesion promoting component that enhances the adhesion between the sizing agent and the reinforcing fibers and / or the matrix resin, a dispersant for the purpose of stabilizing the sizing agent, and a surfactant can be added.
- Adhesion promoting components include triisopropylamine, dibutylethanolamine, diethylethanolamine, triisopropanolamine, diisopropylethylamine, N-benzylimidazole, 1,8-diazabicyclo [5,4,0] -7-undecene (DBU) ), 1,5-diazabicyclo [4,3,0] -5-nonene (DBN), 1,4-diazabicyclo [2,2,2] octane, 5,6-dibutylamino-1,8-diaza-bicyclo And tertiary amine compounds such as [5,4,0] undecene-7 (DBA) and salts thereof; phosphine compounds such as tributylphosphine and triphenylphosphine; and quaternary phosphonium salts. These compounds are preferably added in an amount of 1 to 25% by mass, more preferably 2 to 8% by mass, based on the total amount
- Dispersants and surfactants include nonionic, cationic, and anionic surfactants. From the viewpoint of stability when a water emulsion is used, it is preferable to use nonionic surfactants. More specifically, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene fatty acid amide ether, polyhydric alcohol fatty acid ester, polyoxyethylene polyhydric alcohol fatty acid ester, fatty acid sucrose Examples thereof include esters, alkylolamides, and polyoxyalkylene block copolymers. Furthermore, you may add a polyester compound, an unsaturated polyester compound, etc. suitably in the range which does not affect the effect of this invention.
- a component that imparts convergence or flexibility to the sizing agent-coated reinforcing fiber may be appropriately added within a range that does not affect the effects of the present invention.
- the handleability, abrasion resistance and fluff resistance of the sizing agent-coated reinforcing fiber can be improved, and the impregnation property of the matrix resin can be improved.
- Reinforcing fibers include carbon fibers, glass fibers, ceramic fibers, silicon carbide fibers and other inorganic fibers; aromatic polyamide fibers (aramid fibers), polyethylene fibers, polyethylene terephthalate fibers, polybutylene terephthalate fibers, polyethylene naphthalate fibers, poly Various organic fibers such as arylate fiber, polyacetal fiber, PBO fiber, polyphenylene sulfide fiber, and polyketone fiber can be exemplified, but are not limited thereto. Of these, inorganic fibers such as carbon fibers and glass fibers, and aromatic polyamide fibers are preferable, and carbon fibers are more preferable. Particularly preferred are polyacrylonitrile-based carbon fibers which have good specific strength and specific elastic modulus, and can provide a lightweight and high-strength fiber-reinforced composite material.
- spinning methods such as wet, dry, and dry wet can be used. From the viewpoint of easily obtaining high-strength carbon fibers, it is preferable to use a wet or dry wet spinning method.
- the total fineness of the carbon fiber is preferably 400 to 3000 tex.
- the number of carbon fiber filaments is preferably 1000 to 100,000, and more preferably 3000 to 50,000.
- a solution obtained by dissolving a polyacrylonitrile homopolymer or copolymer in a solvent can be used as the spinning dope.
- a solvent an organic solvent such as dimethyl sulfoxide, dimethylformamide, or dimethylacetamide, or an aqueous solution of an inorganic compound such as nitric acid, sodium rhodanate, zinc chloride, or sodium thiocyanate is used. Dimethyl sulfoxide or dimethylacetamide is preferred as the solvent.
- the above spinning solution is spun through a die and discharged into a spinning bath to be solidified.
- a spinning bath an aqueous solution of a solvent used as a solvent for the spinning dope can be used.
- a spinning solution containing the same solvent as the spinning solution is preferably used, and a dimethyl sulfoxide aqueous solution or a dimethylacetamide aqueous solution is preferable.
- the fibers solidified in the spinning bath are washed with water and drawn to obtain precursor fibers.
- the obtained precursor fiber is subjected to flameproofing treatment and carbonization treatment, and if necessary, further subjected to graphitization treatment to obtain carbon fiber.
- the maximum heat treatment temperature is preferably 1100 ° C. or more, more preferably 1300 to 3000 ° C.
- the single fiber diameter of the carbon fiber is preferably 7.5 ⁇ m or less, more preferably 6 ⁇ m or less, and further preferably 5.5 ⁇ m or less.
- the lower limit of the single fiber diameter is not particularly limited, but if it is less than 4.5 ⁇ m, the single fiber is likely to be cut in the process, and the productivity may be lowered.
- Carbon fibers are usually subjected to an oxidation treatment to improve adhesion to the matrix resin, and oxygen-containing functional groups are introduced to the surface.
- an oxidation treatment method gas phase oxidation, liquid phase oxidation and liquid phase electrolytic oxidation are used. From the viewpoint of high productivity and uniform processing, liquid phase electrolytic oxidation is preferably used.
- Examples of the electrolytic solution used in the liquid phase electrolytic oxidation include an acidic electrolytic solution and an alkaline electrolytic solution.
- Examples of the acidic electrolyte include inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, boric acid, and carbonic acid; organic acids such as acetic acid, butyric acid, oxalic acid, acrylic acid, and maleic acid; or ammonium sulfate and ammonium hydrogen sulfate. And the like. Of these, sulfuric acid and nitric acid exhibiting strong acidity are preferably used.
- alkaline electrolyte examples include aqueous solutions of hydroxides such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide; sodium carbonate, potassium carbonate, magnesium carbonate, calcium carbonate, Aqueous solutions of carbonates such as barium carbonate and ammonium carbonate; aqueous solutions of bicarbonates such as sodium bicarbonate, potassium bicarbonate, magnesium bicarbonate, calcium bicarbonate, barium bicarbonate and ammonium bicarbonate; ammonia, tetraalkylammonium hydroxide And an aqueous solution of hydrazine.
- hydroxides such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide
- sodium carbonate, potassium carbonate, magnesium carbonate, calcium carbonate Aqueous solutions of carbonates such as barium carbonate and ammonium carbonate
- bicarbonates such as sodium bicarbonate, potassium bicarbonate, magnesium bicarbonate, calcium bicarbonate,
- an aqueous solution of ammonium carbonate and ammonium hydrogen carbonate or an aqueous solution of tetraalkylammonium hydroxide exhibiting strong alkalinity is preferably used.
- the carbon fiber is electrolytically oxidized with an alkaline electrolytic solution, or the carbon fiber is an acidic aqueous solution
- a sizing agent after electrolytic oxidation treatment in the substrate, followed by washing with an alkaline aqueous solution.
- an excessively oxidized part on the surface of the carbon fiber exists as a fragile layer and may become a starting point of destruction when made into a composite material. It is considered preferable to dissolve and remove with an aqueous solution.
- the pH of the alkaline aqueous solution used for washing is preferably in the range of 7 to 14, and more preferably in the range of 10 to 14.
- Specific examples of the alkaline aqueous solution include aqueous solutions of hydroxides such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide; sodium carbonate, potassium carbonate, magnesium carbonate, calcium carbonate, and barium carbonate.
- aqueous solutions of carbonates such as ammonium carbonate; aqueous solutions of bicarbonates such as sodium bicarbonate, potassium bicarbonate, magnesium bicarbonate, calcium bicarbonate, barium bicarbonate and ammonium bicarbonate; ammonia, tetraalkylammonium hydroxide and hydrazine
- carbonates such as ammonium carbonate
- bicarbonates such as sodium bicarbonate, potassium bicarbonate, magnesium bicarbonate, calcium bicarbonate, barium bicarbonate and ammonium bicarbonate
- ammonia tetraalkylammonium hydroxide and hydrazine
- a dip method and a spray method can be used as a method for washing the carbon fiber with an alkaline aqueous solution.
- a dip method and a spray method can be used as a method for washing the carbon fiber with an alkaline aqueous solution.
- the concentration of the electrolytic solution is preferably in the range of 0.01 to 5 mol / liter, more preferably in the range of 0.1 to 1 mol / liter.
- concentration of the electrolytic solution is 0.01 mol / liter or more, the voltage of the electrolytic oxidation treatment is lowered, which is advantageous in terms of operating cost.
- concentration of the electrolytic solution is 5 mol / liter or less, it is advantageous from the viewpoint of safety.
- the temperature of the electrolytic solution is preferably in the range of 10 to 100 ° C., more preferably in the range of 10 to 40 ° C.
- the temperature of the electrolytic solution is 10 ° C. or higher, the efficiency of the electrolytic oxidation treatment is improved, which is advantageous in terms of operating cost.
- the temperature of the electrolytic solution is 100 ° C. or lower, it is advantageous from the viewpoint of safety.
- the current density in the liquid phase electrolytic oxidation is preferably in the range of 1.5 to 1000 amperes / m 2 per 1 m 2 of the surface area of the carbon fiber in the electrolytic solution, more preferably in the range of 3 to 500 amperes / m 2 . Is within.
- the current density is 1.5 amperes / m 2 or more, the efficiency of the electrolytic oxidation treatment is improved, which is advantageous in terms of operating cost.
- the current density is 1000 amperes / m 2 or less, it is advantageous from the viewpoint of safety.
- the amount of electricity in the liquid phase electrolytic oxidation treatment is preferably optimized according to the carbonization degree of the carbon fiber. When processing high-modulus carbon fiber, a larger amount of electricity is required.
- the carbon fiber has a surface oxygen concentration (O / C), which is the ratio of the number of oxygen (O) and carbon (C) atoms on the fiber surface measured by X-ray photoelectron spectroscopy, of 0.05 to 0.00. Those within the range of 50 are preferred, more preferably within the range of 0.07 to 0.30, and even more preferably within the range of 0.10 to 0.30.
- O / C surface oxygen concentration
- the surface oxygen concentration (O / C) is 0.05 or more, an oxygen-containing functional group on the surface of the carbon fiber can be secured and strong adhesion with the matrix resin can be obtained.
- the surface oxygen concentration (O / C) is 0.5 or less, a decrease in strength of the carbon fiber itself due to oxidation can be suppressed.
- the surface oxygen concentration of the carbon fiber can be determined by X-ray photoelectron spectroscopy according to the following procedure. First, carbon fibers from which dirt and the like adhering to the carbon fiber surface were removed with a solvent were cut into a length of 20 mm, spread and arranged on a copper sample support, and then AlK ⁇ 1 and 2 were used as an X-ray source. The sample chamber is maintained at 1 ⁇ 10 ⁇ 8 Torr. As a correction value for the peak accompanying charging during measurement, the binding energy value of the main peak (peak top) of C 1s is adjusted to 284.6 eV. The C 1s peak area is obtained by drawing a straight base line in the range of 282 to 296 eV.
- the O 1s peak area can be obtained by drawing a straight base line in the range of 528 to 540 eV.
- the surface oxygen concentration can be calculated as an atomic ratio by using a sensitivity correction value unique to the apparatus from the ratio of the O 1s peak area to the C 1s peak area.
- the carbon fiber is washed with a liquid phase electrolytic oxidation treatment or an alkaline aqueous solution, then washed with water and dried.
- the drying temperature is too high, the functional groups present on the outermost surface of the carbon fiber are likely to disappear due to thermal decomposition, and thus it is desirable to dry at the lowest possible temperature.
- the drying is performed at a drying temperature of preferably 250 ° C. or lower, more preferably 210 ° C. or lower.
- the drying temperature is preferably 110 ° C. or higher, and more preferably 140 ° C. or higher.
- carbon fibers that are preferably used can be obtained.
- the strand strength of the carbon fiber is preferably 3.5 GPa or more, more preferably 4 GPa or more, and further preferably 5 GPa. Moreover, it is preferable that the strand elastic modulus of carbon fiber is 220 GPa or more, More preferably, it is 240 GPa or more, More preferably, it is 280 GPa or more.
- the strand tensile strength and strand elastic modulus of the carbon fiber bundle can be determined by the resin impregnated strand test method of JIS-R-7608 (2004).
- a sizing agent containing polyrotaxane can be diluted with a solvent.
- a solvent examples include water, methanol, ethanol, 2-propanol, acetone, methyl ethyl ketone, dimethylformamide, and dimethylacetamide.
- water is preferably used because it is easy to handle and advantageous from the viewpoint of safety.
- a surfactant can be added and used as an aqueous emulsion. Although it does not specifically limit as surfactant, Nonionic surfactants, such as a block copolymer of ethylene oxide and propylene oxide, etc. can be mentioned preferably.
- a coating method a method of coating at once using a sizing agent-containing solution in which polyrotaxane and other sizing agent components are simultaneously dissolved or dispersed, and a sizing agent-containing solution in which each component is arbitrarily selected and individually dissolved or dispersed
- a method of applying a plurality of times using is preferably used.
- the polyrotaxane and other components can be added in any order.
- the application means for the case where the above sizing agent dispersion liquid simultaneously contains a polyrotaxane and other components will be described. The same can be done for application.
- Examples of the application means include, for example, a method in which reinforcing fibers are immersed in a sizing agent-containing liquid via a roller, a method in which reinforcing fibers are in contact with a roller to which the sizing agent-containing liquid is attached, and a sizing agent-containing liquid is atomized to form reinforcing fibers.
- the sizing agent applying means may be either a batch type or a continuous type, but a continuous type which is good in productivity and can reduce variation is preferably used.
- the concentration and temperature of the sizing agent-containing liquid and the yarn tension of the reinforcing fiber so that the amount of the sizing agent active component attached to the reinforcing fiber is uniform within an appropriate range.
- the reinforcing fiber is vibrated with ultrasonic waves when the sizing agent is applied.
- the adhesion amount of the sizing agent is preferably in the range of 0.1 to 10 parts by mass, more preferably in the range of 0.2 to 3 parts by mass with respect to 100 parts by mass of the sizing agent-coated reinforcing fiber.
- the adhesion amount of the sizing agent is 0.1 parts by mass or more, when prepreg and weaving the sizing agent-coated reinforcing fiber, it can withstand friction caused by a metal guide that passes therethrough, and generation of fluff is suppressed. The quality of the prepreg using the reinforcing fiber is excellent.
- the adhesion amount of the sizing agent is 10 parts by mass or less
- the matrix resin is impregnated inside the reinforcing fiber bundle without being inhibited by the sizing agent film around the reinforcing fiber bundle, and void formation is suppressed in the obtained composite material. Therefore, the quality and mechanical properties of the composite material are excellent.
- the thickness of the sizing agent layer applied to the reinforcing fiber after drying is preferably in the range of 2.0 to 20 nm, and the maximum value of the thickness does not exceed twice the minimum value.
- Reinforcing fibers are manufactured by applying a sizing agent-containing liquid, then heat-treating, removing the solvent contained in the sizing agent-containing liquid and drying.
- the heat treatment is considered to have an effect of promoting the formation of a covalent bond between the sizing agent component and the functional group on the surface of the reinforcing fiber and enhancing the adhesion between the reinforcing fiber and the matrix resin.
- the heat treatment conditions are preferably in the temperature range of 130 ° C. to 260 ° C., more preferably in the temperature range of 160 to 260 ° C., and preferably 30 to 600 seconds. When the temperature is 130 ° C. or higher and 30 seconds or longer, water and organic solvent in which the sizing agent component is dissolved or dispersed can be sufficiently removed. When it is 260 ° C. or lower and 600 seconds or shorter, the operation cost and safety are particularly excellent.
- the heat treatment can be performed by microwave irradiation and / or infrared irradiation.
- the reinforcing fiber When the reinforcing fiber is heat-treated by microwave irradiation and / or infrared irradiation, the reinforcing fiber that is the object to be heated can be heated to a desired temperature in a short time.
- the inside of the reinforcing fiber can be quickly heated by microwave irradiation and / or infrared irradiation, the temperature difference between the inside and outside of the reinforcing fiber bundle can be reduced, and the adhesion unevenness of the sizing agent can be reduced. It becomes possible to do.
- the reinforcing fiber is carbon fiber
- the sizing agent component can be applied to the carbon fiber surface simultaneously with water washing in a later washing step.
- the amount of the sizing agent component attached can be controlled by controlling the concentration and temperature of the electrolytic solution and the yarn tension of the carbon fiber.
- the sizing-coated reinforcing fiber of the present invention is used in the form of, for example, tow, woven fabric, knitted fabric, braided string, web, mat, and chopped fiber.
- tows in which carbon fibers are aligned in one direction are most suitable.
- a prepreg obtained by impregnating a sizing coated reinforcing fiber with a matrix resin is preferably used.
- the sizing coated reinforcing fiber in the present invention can be used as a prepreg and a fiber reinforced composite material in combination with a matrix resin.
- thermosetting resin As the prepreg and the matrix resin of the fiber reinforced composite material, either a thermosetting resin or a thermoplastic resin can be used.
- a thermosetting resin is more preferable.
- the thermosetting resins include unsaturated polyester resins, vinyl ester resins, epoxy resins, phenol resins, melamine resins, urea resins, thermosetting polyimide resins, cyanate ester resins, and bismaleimide resins, and their modifications. Body, and a resin obtained by blending two or more of these.
- an epoxy resin is preferable because it has an advantage of excellent balance of mechanical properties and small curing shrinkage.
- the epoxy resin is preferably an epoxy resin composition containing an epoxy compound and a curing agent.
- the epoxy compound is not particularly limited, and is not limited to bisphenol type epoxy compound, amine type epoxy compound, phenol novolac type epoxy compound, cresol novolac type epoxy compound, resorcinol type epoxy compound, phenol aralkyl type epoxy compound, naphthol aralkyl type epoxy.
- One or more compounds can be selected and used from among compounds, dicyclopentadiene type epoxy compounds, epoxy compounds having a biphenyl skeleton, isocyanate-modified epoxy compounds, tetraphenylethane type epoxy compounds, triphenylmethane type epoxy compounds, and the like.
- the curing agent is not particularly limited, and examples thereof include an aromatic amine curing agent, dicyanamide or a derivative thereof.
- amines such as alicyclic amines, phenol compounds, acid anhydrides, polyamide aminos, organic acid hydrazides, isocyanates, and the like can be used in combination with aromatic amine curing agents.
- an epoxy resin composition containing a polyfunctional glycidylamine type epoxy compound and an aromatic diamine curing agent it is preferable to use an epoxy resin composition containing a polyfunctional glycidylamine type epoxy compound and an aromatic diamine curing agent.
- a matrix resin containing a polyfunctional glycidylamine type epoxy compound and an aromatic diamine curing agent has a high crosslinking density, and can improve the heat resistance and compressive strength of the resulting fiber-reinforced composite material.
- the polyfunctional glycidylamine type epoxy compound for example, tetraglycidyldiaminodiphenylmethane, triglycidylaminophenol, triglycidylaminocresol and the like can be preferably used.
- the polyfunctional glycidylamine type epoxy compound has an effect of improving heat resistance, and the ratio is preferably 30 to 100% by mass in 100% by mass of all epoxy compounds. When the ratio of the glycidylamine type epoxy compound is 30% by mass or more, the compressive strength of the fiber reinforced composite material is improved and the heat resistance is excellent.
- tetraglycidyldiaminodiphenylmethane examples include, for example, “Sumiepoxy (registered trademark)” ELM434 (manufactured by Sumitomo Chemical Co., Ltd.), YH434L (manufactured by Toto Kasei Co., Ltd.), “Araldite (registered trademark)” MY720 (Huntsman Advanced Materials Co., Ltd.), “jER (registered trademark)” 604 (Japan Epoxy Resin Co., Ltd.) and the like can be used.
- triglycidylaminophenol or triglycidylaminocresol examples include, for example, “Sumiepoxy (registered trademark)” ELM100 (manufactured by Sumitomo Chemical Co., Ltd.), “Araldite (registered trademark)” MY0510, and “Araldite (registered trademark)”. “MY0600 (manufactured by Huntsman Advanced Materials Co., Ltd.)”, “jER (registered trademark)” 630 (manufactured by Japan Epoxy Resin Co., Ltd.) and the like can be used.
- the aromatic diamine curing agent is not particularly limited as long as it is an aromatic amine used as a curing agent for an epoxy resin composition.
- 3,3′-diaminodiphenyl sulfone (3,3) is used.
- aromatic amine curing agents include Seika Cure S (manufactured by Wakayama Seika Kogyo Co., Ltd.), MDA-220 (manufactured by Mitsui Chemicals), “jER Cure (registered trademark)” W (Japan Epoxy Resin ( ), And 3,3′-DAS (Mitsui Chemicals), “Lonacure (registered trademark)” M-DEA (Lonza), “Lonzasure (registered trademark)” M-DIPA ( Lonza Co., Ltd.), “Lonzacure (registered trademark)” M-MIPA (Lonza Co., Ltd.) and “Lonzacure (registered trademark)” DETDA 80 (Lonza Co., Ltd.).
- the aromatic diamine curing agent is preferably contained in a stoichiometric amount of 50 to 120% by mass, more preferably 60 to 120% by mass, and still more preferably, based on the total epoxy compound contained in the epoxy resin composition. 70 to 90% by mass.
- the aromatic amine curing agent is 50% by mass or more of the stoichiometric amount with respect to the total epoxy compound, the heat resistance of the obtained resin cured product is improved.
- curing agent is 120 mass% or less, the toughness of the resin cured material obtained improves.
- an effect promoter can be blended for the purpose of promoting the curing of the epoxy resin composition.
- the curing accelerator include urea compounds, tertiary amines and salts thereof, imidazoles and salts thereof, triphenylphosphine or derivatives thereof, carboxylic acid metal salts and Lewis acids, Bronsted acids and salts thereof, and the like.
- thermoplastic resin can be blended with the matrix resin of the fiber reinforced composite material in order to improve physical properties such as toughness of the obtained cured resin.
- thermoplastic resins include carbon-carbon bonds, amide bonds, imide bonds (polyetherimide, etc.), ester bonds, ether bonds, siloxane bonds, carbonate bonds, urethane bonds, urea bonds, thioether bonds,
- a thermoplastic resin having a bond selected from the group consisting of a sulfone bond, an imidazole bond, and a carbonyl bond can be used.
- those having both heat resistance and toughness such as polysulfone, polyethersulfone, polyetherimide, polyimide, polyamide, polyamideimide, polyphenylene ether, phenoxy resin, and vinyl polymer can be preferably used.
- polyethersulfone and polyetherimide are suitable because these effects can be exhibited with almost no loss of heat resistance.
- Polyether sulfones include “Sumika Excel (registered trademark)” 3600P, “Sumika Excel (registered trademark)” 5003P, “Sumika Excel (registered trademark)” 5200P, “Sumika Excel (registered trademark)” 7200P (above, Sumitomo Chemical) Kogyo Co., Ltd.) and polyetherimide include "Ultem (registered trademark)” 1000, “Ultem (registered trademark)” 1010, “Ultem (registered trademark)” 1040 (above, manufactured by Nippon GE Plastics Co., Ltd.) ) Etc. can be used.
- the amount of the thermoplastic resin is preferably 1 to 40 parts by mass, more preferably 1 to 25 parts by mass with respect to 100 parts by mass of the epoxy compound when dissolved in the epoxy resin composition. .
- the amount is preferably 10 to 40 parts by weight, more preferably 15 to 30 parts by weight with respect to 100 parts by weight of the epoxy compound.
- thermoplastic resin is preferably uniformly dissolved in the epoxy resin composition or finely dispersed in the form of particles so as not to interfere with the prepreg production process, particularly in terms of impregnation. .
- thermosetting resin other than the thermosetting resin used as the matrix resin, elastomer, filler, rubber particles, thermoplastic resin particles, inorganic particles and other additives are blended. You can also.
- thermoplastic resin particles the same thermoplastic resins as those exemplified above can be used.
- polyamide particles and polyimide particles are preferably used.
- polyamides Nylon 12, Nylon 6, Nylon 11, Nylon 6/12 copolymer can give particularly good adhesive strength with thermosetting resin. It is preferable because the delamination strength is high and the effect of improving impact resistance is high.
- particles made into a semi-IPN (polymer interpenetrating network structure) by a combination of a polyamide resin and an epoxy resin have high heat resistance and solvent resistance. More preferable. Specific examples include “Trepearl (registered trademark)” TN manufactured by Toray Industries, Inc.
- thermoplastic resin particles may be spherical particles, non-spherical particles, or porous particles, but since the spherical particles do not deteriorate the flow characteristics of the resin, they are excellent in viscoelasticity and have no origin of stress concentration. This is preferable in terms of giving high impact resistance.
- 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 are preferably used from the viewpoint of handleability and the like.
- inorganic particles such as silica, alumina, smectite, and synthetic mica can be added to the matrix resin in order to adjust fluidity such as thickening of the matrix resin within the range that does not impair the effects of the present invention.
- Prepreg is a wet method in which the above matrix resin is dissolved in a solvent such as methyl ethyl ketone or methanol to lower the viscosity and impregnated into the reinforcing fiber, or a hot melt method in which the viscosity is lowered by heating and impregnated into the reinforcing fiber (dry method). Or the like.
- the wet method is a method in which a reinforcing fiber is immersed in a matrix resin solution, then lifted, and the solvent is evaporated using an oven or the like.
- the hot melt method is a method in which a reinforcing resin is impregnated directly with a matrix resin whose viscosity is reduced by heating, or a film in which a matrix resin is coated on a release paper or the like is once prepared, and then the film is applied from both sides or one side of the reinforcing fiber. And reinforcing the fiber by impregnating the matrix resin with heat and pressure.
- the hot melt method is a preferable method because there is substantially no solvent remaining in the prepreg.
- a fiber-reinforced composite material can be produced by a method of heat-curing the matrix resin while applying pressure to the laminate.
- 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, a vacuum pressure molding method, and the like are employed.
- the fiber reinforced composite material does not go through a prepreg, and includes, for example, a filament winding method, a hand layup method, a resin injection molding method, “SCRIMP (registered trademark)”, a resin film infusion method, and a resin transfer method. It can also be produced by a molding method such as a molding method.
- the fiber reinforced composite material of the present invention is, for example, a personal computer, a display, an OA device, a mobile phone, a portable information terminal, a facsimile, a compact disc, a portable MD, a portable radio cassette, a PDA (a portable information terminal such as an electronic notebook), a video.
- Example 1 carbon fiber was used as the reinforcing fiber.
- This example comprises the following I step, II step and III step.
- Step I Step of producing carbon fiber A copolymer composed of 99 mol% of acrylonitrile and 1 mol% of itaconic acid was spun and fired, and the total number of filaments was 12,000, specific gravity 1.8, strand tensile strength 700 kgf / mm 2, to obtain a carbon fiber strand tensile modulus 33,000kgf / mm 2.
- the carbon fiber was subjected to liquid phase electrolytic oxidation treatment using an aqueous solution of ammonium hydrogen carbonate having a concentration of 0.1 mol / liter as an electrolytic solution.
- the carbon fiber subjected to the liquid phase electrolytic oxidation treatment was subsequently washed with water and dried in heated air at a temperature of 150 ° C. to obtain a carbon fiber subjected to surface oxidation treatment.
- Step II Step of producing sizing-coated carbon fiber and evaluation 70 parts by mass of (A-1) as a compound having an epoxy group, 30 parts by mass of (B-1) as a polyrotaxane, and dimethylformamide as a solvent Then, a sizing agent solution was prepared. This sizing agent solution was applied to the surface oxidized carbon fiber obtained as described above using a dipping method and then heat treated at a temperature of 210 ° C. for 180 seconds to obtain a sizing agent-coated carbon fiber bundle. The adhesion amount of the sizing agent was measured by the method described below and adjusted so that the adhesion amount of the sizing agent was 0.5 parts by mass with respect to 100 parts by mass of the sizing agent-coated carbon fibers.
- IFSS interfacial shear strength
- (C) Resin casting and curing
- the resin prepared in the procedure (a) is poured into the dumbbell mold after the vacuum drying in the procedure (b), and the heating rate is 1.5 ° C. using an oven.
- the temperature rises to 75 ° C./min and is maintained at 75 ° C. for 2 hours, then rises to a temperature of 125 ° C. at a heating rate of 1.5 minutes, held at 125 ° C. for 2 hours, and then the cooling rate is 2.5 ° C.
- the temperature was lowered to 30 ° C. in minutes. Then, it demolded and the test piece was obtained.
- Interfacial shear strength IFSS (MPa) ⁇ (MPa) ⁇ d ( ⁇ m) / (2 ⁇ lc) ( ⁇ m)
- the strand tensile strength was determined according to the following procedure in accordance with the resin impregnated strand test method of JIS-R-7608 (2004).
- the interfacial shear strength IFSS is an index of the adhesive strength between the carbon fiber and the matrix resin interface. In the present invention, 30 MPa or more is a preferable range.
- Step III Preparation of prepreg, molding and evaluation of carbon fiber reinforced composite laminate ⁇ Preparation of prepreg> First, bisphenol A type epoxy resin, “jER (registered trademark)” 828 (manufactured by Mitsubishi Chemical Corporation) 60 parts by mass, tetraglycidyldiaminodiphenylmethane, ELM434 (manufactured by Sumitomo Chemical Co., Ltd.) 40 parts by mass, 4, 4 ′ -40 parts by mass of diaminodiphenylsulfone, “Seika Cure (registered trademark)” S (manufactured by Wakayama Seika Co., Ltd.) and 10 parts by mass of polyethersulfone “Sumika Excel (registered trademark)” PES5003P (manufactured by Sumitomo Chemical Co., Ltd.) A kneaded epoxy resin composition was prepared, and this was coated on a release paper with a resin basis weight of 30 g / m 2
- This primary resin film is superimposed on both sides of a sizing agent-coated carbon fiber (weight per unit area 190 g / m 2 ) aligned in one direction, and the epoxy resin composition is applied to the sizing agent-coated carbon fiber while heating and pressing using a heat roll.
- a primary prepreg was produced by impregnation.
- a resin composition was prepared by further kneading 80 parts by mass of the above-mentioned epoxy resin composition with “Trepearl (registered trademark)” TN (manufactured by Toray Industries, Inc., average particle size: 13.0 ⁇ m).
- a secondary resin film was prepared by coating the release paper with a resin basis weight of 20 g / m 2 using a coater. This secondary resin film was overlapped on both sides of the primary prepreg, and the primary prepreg was impregnated with the resin composition to produce a target prepreg.
- High mode I interlaminar fracture toughness means that the adhesion between the carbon fiber and the matrix resin is good, and the toughness of the fiber-reinforced composite material is high.
- the mode I interlaminar fracture toughness (G Ic ) is preferably in the range of 700 J / m 2 or more.
- Table 1 the value of the mode I interlaminar fracture toughness (G Ic) are marked 950J / m 2 or more of A, less than 700 J / m 2 or more 950J / m 2 B, less than 700 J / m 2 at C ing.
- Step I Step of producing carbon fiber as raw material The same procedure as in Example 1 was performed.
- Step II Step for producing sizing coated carbon fiber and evaluation Sizing agent coated carbon fiber was obtained in the same manner as in Example 1 except that the ratio of each component was as shown in Table 1. . Subsequently, when the interfacial shear strength (IFSS) was measured in the same manner as in Example 1 using the obtained sizing agent-coated carbon fiber, it was found that the adhesiveness was sufficiently high. The results are shown in Table 1.
- IFSS interfacial shear strength
- Step III Preparation of prepreg, molding of carbon fiber reinforced composite material laminate and evaluation
- a unidirectional reinforcing material carbon fiber reinforced composite material
- the I interlaminar fracture toughness (G Ic ) showed a sufficiently high value. The results are shown in Table 1.
- Example 10 Step I: Step of producing carbon fiber The same procedure as in Example 1 was performed.
- Step II Step of producing sizing coated carbon fiber and evaluation Implemented except that the concentration of the sizing agent solution was adjusted so that the adhesion amount of the sizing agent was 1 part by mass with respect to 100 parts by mass of the sizing agent coated carbon fiber.
- Sizing agent-coated carbon fibers were obtained in the same manner as in Example 1. Subsequently, when the interfacial shear strength (IFSS) was measured in the same manner as in Example 1 using the obtained sizing agent-coated carbon fiber, it was found that the adhesiveness was sufficiently high. The results are shown in Table 1.
- IFSS interfacial shear strength
- Step III Preparation of prepreg, molding of carbon fiber reinforced composite material laminate and evaluation
- a unidirectional reinforcing material carbon fiber reinforced composite material
- the I interlaminar fracture toughness (G Ic ) showed a sufficiently high value. The results are shown in Table 1.
- Step I Step of producing carbon fiber The same procedure as in Example 1 was performed.
- Step II Step of producing sizing-coated carbon fiber and evaluation Sizing agent-coated carbon fiber was obtained in the same manner as in Example 1 except that the sizing agent solution was prepared using only the component (A-2). Subsequently, when the interfacial shear strength (IFSS) was measured in the same manner as in Example 1 using the obtained sizing agent-coated carbon fiber, it was found that the adhesiveness was sufficiently high. The results are shown in Table 1.
- Step III Preparation of prepreg, molding of carbon fiber reinforced composite material laminate and evaluation
- a unidirectional reinforcing material carbon fiber reinforced composite material
- the I interlaminar fracture toughness (G Ic ) showed a low value. The results are shown in Table 1.
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Abstract
Description
ポリロタキサンに用いられる環状分子は、その開口部に直鎖状分子が串刺し状に包接され得る分子であれば、特に限定されない。
ポリロタキサンの直鎖状分子は、環状分子の開口部に串刺し状に包接され得るものであれば、特に限定されない。
複数の環状分子が直鎖状分子を串刺し状に包接する際に、1本の直鎖状分子を環状分子が最大限に包接する量を1とした場合、前記環状分子が0.001~0.6、好ましくは0.01~0.5、より好ましくは0.05~0.4の範囲の量で直鎖状分子を包接するのがよい。
ポリロタキサンの封鎖基は、直鎖状分子の両端に配置され、環状分子が脱離しないように作用する基であれば、特に限定されない。
(A-1)“デナコール(登録商標)”EX-521(ナガセケムテックス(株)製:ポリグリセリンポリグリシジルエーテル)
(A-2)“デナコール(登録商標)”EX-411(ナガセケムテックス(株)製:ペンタエリスリトールポリグリシジルエーテル)
(A-3)“デナコール(登録商標)”EX-611(ナガセケムテックス(株)製:ソルビトールポリグリシジルエーテル)。
(B-1)“セルム(登録商標)”スーパーポリマーSH2400P(アドバンストソフトマテリアルズ(株)製:環状分子はα-シクロデキストリン;直鎖状分子は重量平均分子量20,000のポリエチレングリコール;封鎖基はアダマンタン基;環状分子はポリ(ε-カプロラクトン)からなるグラフト鎖により修飾されている)
(B-2)“セルム(登録商標)”スーパーポリマーSH1310P(アドバンストソフトマテリアルズ(株)製:環状分子はα-シクロデキストリン;直鎖状分子は重量平均分子量11,000のポリエチレングリコール;封鎖基はアダマンタン基;環状分子はポリ(ε-カプロラクトン)からなるグラフト鎖により修飾されている)
(B-3)“セルム(登録商標)”スーパーポリマーSH3400P(アドバンストソフトマテリアルズ(株)製:環状分子はα-シクロデキストリン;直鎖状分子は重量平均分子量35,000のポリエチレングリコール;封鎖基はアダマンタン基;環状分子はポリ(ε-カプロラクトン)からなるグラフト鎖により修飾されている)。
本実施例では、強化繊維として炭素繊維を用いた。本実施例は、次の第Iの工程、第IIの工程および第IIIの工程からなる。
アクリロニトリル99モル%とイタコン酸1モル%からなる共重合体を紡糸した後、焼成し、総フィラメント数12,000本、比重1.8、ストランド引張強度700kgf/mm2、ストランド引張弾性率33,000kgf/mm2の炭素繊維を得た。次いで、その炭素繊維を、濃度0.1モル/リットルの炭酸水素アンモニウム水溶液を電解液として、液相電解酸化処理した。この液相電解酸化処理を施された炭素繊維を続いて水洗し、150℃の温度の加熱空気中で乾燥し、表面酸化処理された炭素繊維を得た。
エポキシ基を有する化合物として(A-1)を70質量部、ポリロタキサンとして(B-1)が30質量部を、溶媒としてジメチルホルムアミドに溶解してサイジング剤溶液を調合した。このサイジング剤溶液を浸漬法を用いて、上記により得られた表面酸化処理された炭素繊維に塗布した後、210℃の温度で180秒間熱処理をして、サイジング剤塗布炭素繊維束を得た。サイジング剤の付着量を、以下に記す方法により測定し、サイジング剤塗布炭素繊維100質量部に対して、サイジング剤の付着量が0.5質量部となるように調整した。
約2gのサイジング剤塗布炭素繊維束を秤量(W1)(小数第4位まで読み取り)した後、50ミリリットル/分の窒素気流中、450℃の温度に設定した電気炉(容量120cm3)に15分間放置し、サイジング剤を完全に熱分解させた。そして、20リットル/分の乾燥窒素気流中の容器に移し、15分間冷却した後の炭素繊維束を秤量(W2)(少数第4位まで読み取り)した。次式よりサイジング剤塗布炭素繊維束100質量部に対するサイジング剤付着量を求めた。
サイジング剤付着量(質量部)=[W1(g)-W2(g)]/[W1(g)]×100
本実施例では、測定は2回おこない、その平均値をサイジング剤付着量とした。
界面剪断強度(IFSS)の測定は、次の(a)~(d)の手順でおこなった。
ビスフェノールA型エポキシ樹脂化合物“jER”(登録商標)828(三菱化学(株)製)100質量部とメタフェニレンジアミン(シグマアルドリッチジャパン(株)製)14.5質量部を、それぞれ容器に入れた。その後、上記のjER828の粘度低下とメタフェニレンジアミンの溶解のため、75℃の温度で15分間加熱をおこなった後、両者をよく混合し、80℃の温度で約15分間真空脱泡をおこなった。
炭素繊維束から単繊維を抜き取り、単繊維に一定張力を与えた状態で、単繊維の両端をダンベル型モールドの長手方向に接着剤で固定した。その後、炭素繊維およびモールドに付着した水分を除去するため、80℃の温度で30分間以上真空乾燥をおこなった。ダンベル型モールドは、シリコーンゴム製で、注型部分の形状は、中央部分巾5mm、長さ25mm、両端部分巾10mm、全体長さ150mmである。
上記(b)の手順の真空乾燥後のダンベル型モールド内に、上記(a)の手順で調製した樹脂を流し込み、オーブンを用いて、昇温速度1.5℃/分で75℃の温度まで上昇し、75℃で2時間保持後、昇温速度1.5分で125℃の温度まで上昇し、125℃で2時間保持後、降温速度2.5℃/分で30℃の温度まで降温させた。その後、脱型して試験片を得た。
上記(c)の手順で得られた試験片に、繊維軸方向(長手方向)に引張力を与え、歪みを12%生じさせた後、偏光顕微鏡を用いて試験片中心部22mmの範囲における繊維破断数N(個)を測定した。次に、平均破断繊維長laを、la(μm)=22×1000(μm)/N(個)の式により計算し、さらに平均破断繊維長laから臨界繊維長lcを、lc(μm)=(4/3)×la(μm)の式により計算した。ストランド引張強度σと炭素繊維単糸の直径dを測定し、界面剪断強度IFSSを、次式で算出した。実施例では、測定数n=5の平均を試験結果とした。
界面剪断強度IFSS(MPa)=σ(MPa)×d(μm)/(2×lc)(μm)
なお、ストランド引張強度は、JIS-R-7608(2004)の樹脂含浸ストランド試験法に準拠し、次の手順に従い求めた。含浸させる樹脂としては、“セロキサイド”(登録商標)2021P(ダイセル化学工業社製)/三フッ化ホウ素モノエチルアミン(東京化成工業(株)製)/アセトン=100/3/4(質量部)を用いた。樹脂の硬化条件としては、常圧、温度125℃、硬化時間30分とした。炭素繊維束のストランド10本を測定し、その平均値をストランド引張強度とした。
<プリプレグの作製>
まず、ビスフェノールA型エポキシ樹脂、“jER(登録商標)”828(三菱化学(株)製)60質量部、テトラグリシジルジアミノジフェニルメタン、ELM434(住友化学(株)製)40質量部、4,4’-ジアミノジフェニルスルホン、“セイカキュア(登録商標)”S(和歌山精化(株)製)40質量部および、ポリエーテルスルホン“スミカエクセル(登録商標)”PES5003P(住友化学(株)製)10質量部を混練したエポキシ樹脂組成物を調製し、これをナイフコーターを用いて樹脂目付30g/m2で離型紙上にコーティングし、1次樹脂フィルムを作製した。この1次樹脂フィルムを1方向に引き揃えたサイジング剤塗布炭素繊維(目付190g/m2)の両側に重ね合わせて、ヒートロールを用い加熱加圧しながらエポキシ樹脂組成物をサイジング剤塗布炭素繊維に含浸させることにより、1次プリプレグを作製した。次に、上記のエポキシ樹脂組成物にさらに“トレパール(登録商標)”TN(東レ(株)製、平均粒子径:13.0μm)80質量部を混練した樹脂組成物を調製し、これをナイフコーターを用いて樹脂目付20g/m2で離型紙上にコーティングし、2次樹脂フィルムを作製した。この2次樹脂フィルムを1次プリプレグの両側に重ね合せて、樹脂組成物を1次プリプレグに含浸させ、目的のプリプレグを作製した。
前記のようにして作製したプリプレグを裁断し、一方向積層した後、オートクレーブを用いて加熱硬化させ、一方向強化材(炭素繊維強化複合材料)を作製した。JIS K7086(1993)に記載の双方持ちはり試験に従って、亀裂進展初期のモードI層間破壊靱性(GIc)を求めたところ、十分に高い値を示した。結果を表1に示す。
第Iの工程:原料となる炭素繊維を製造する工程
実施例1と同様にした。
各成分の比が表1に記載のようになるようにした以外は、実施例1と同様の方法でサイジング剤塗布炭素繊維を得た。続いて、得られたサイジング剤塗布炭素繊維を用いて、実施例1と同様に界面剪断強度(IFSS)を測定したところ、接着性が十分に高いことがわかった。結果を表1に示す。
実施例1と同様に、一方向強化材(炭素繊維強化複合材料)を作製し、力学特性を評価したところ、モードI層間破壊靱性(GIc)は十分に高い値を示した。結果を表1に示す。
第Iの工程:炭素繊維を製造する工程
実施例1と同様にした。
サイジング剤の付着量をサイジング剤塗布炭素繊維100質量部に対して1質量部となるようにサイジング剤溶液濃度を調整した以外は、実施例1と同様の方法でサイジング剤塗布炭素繊維を得た。続いて、得られたサイジング剤塗布炭素繊維を用いて、実施例1と同様に界面剪断強度(IFSS)を測定したところ、接着性が十分に高いことがわかった。結果を表1に示す。
実施例1と同様に、一方向強化材(炭素繊維強化複合材料)を作製し、力学特性を評価したところ、モードI層間破壊靱性(GIc)は十分に高い値を示した。結果を表1に示す。
第Iの工程:炭素繊維を製造する工程
実施例1と同様にした。
サイジング剤溶液を、(A-2)成分のみで調合した以外は、実施例1と同様の方法でサイジング剤塗布炭素繊維を得た。続いて、得られたサイジング剤塗布炭素繊維を用いて、実施例1と同様に界面剪断強度(IFSS)を測定したところ、接着性が十分に高いことがわかった。結果を表1に示す。
実施例1と同様に、一方向強化材(炭素繊維強化複合材料)を作製し、力学特性を評価したところ、モードI層間破壊靱性(GIc)は低い値を示した。結果を表1に示す。
Claims (15)
- 強化繊維にポリロタキサンを含むサイジング剤が塗布されてなるサイジング剤塗布強化繊維。
- 前記サイジング剤が、エポキシ基を有する化合物をさらに含む、請求項1に記載のサイジング剤塗布強化繊維。
- 前記エポキシ基を有する化合物が、分子内にエポキシ基を2以上有する化合物であって、ポリエーテル型ポリエポキシ化合物およびポリオール型ポリエポキシ化合物から選ばれた化合物である、請求項2に記載のサイジング剤塗布強化繊維。
- 前記エポキシ基を有する化合物が、グリセリン、ジグリセリン、ポリグリセリン、トリメチロールプロパン、ペンタエリスリトール、ソルビトール、およびアラビトールから選択される1種以上の化合物と、エピクロロヒドリンとの反応により得られるグリシジルエーテル型エポキシ化合物である、請求項3に記載のサイジング剤塗布強化繊維。
- 前記サイジング剤が、サイジング剤全量に対してポリロタキサンを5~80質量%含む、請求項1~4のいずれかに記載のサイジング剤塗布強化繊維。
- 前記ポリロタキサンの構成成分である直鎖状分子の重量平均分子量が15,000以上30,000以下である、請求項1~5のいずれかに記載のサイジング剤塗布強化繊維。
- 前記ポリロタキサンが、シクロデキストリンおよびポリエチレングリコールを構成成分とする、請求項1~6のいずれかに記載のサイジング剤塗布強化繊維。
- 前記シクロデキストリンが、高分子鎖により修飾されており、該高分子鎖は、-O-結合および-NH-結合から選ばれた結合、ならびに、アルキレン基およびアルケニレン基から選ばれた基を含む請求項7に記載のサイジング剤塗布強化繊維。
- 強化繊維が炭素繊維である請求項1~8のいずれかに記載のサイジング剤塗布強化繊維。
- 強化繊維にポリロタキサンを含むサイジング剤を塗布した後、熱処理することによってサイジング剤塗布強化繊維を製造する方法であって、前記サイジング剤を塗布する工程において、サイジング剤の付着量がサイジング剤塗布強化繊維100質量部に対して0.1~10質量部となるようにし、かつ、前記熱処理する工程の条件が160~260℃の温度範囲で30~600秒間であるサイジング剤塗布強化繊維の製造方法。
- 請求項1~9のいずれかに記載のサイジング剤塗布強化繊維と、熱硬化性樹脂とを含むプリプレグ。
- 前記熱硬化性樹脂がエポキシ樹脂である請求項11に記載のプリプレグ。
- 請求項11または12に記載のプリプレグを硬化させてなる繊維強化複合材料。
- 請求項1~9のいずれかに記載のサイジング剤塗布強化繊維と熱硬化性樹脂の硬化物からなる繊維強化複合材料。
- 前記熱硬化性樹脂がエポキシ樹脂である請求項14に記載の繊維強化複合材料。
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CN111615530B (zh) * | 2018-01-26 | 2022-10-25 | 东丽株式会社 | 纤维增强热塑性树脂成型品及纤维增强热塑性树脂成型材料 |
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JP7205252B2 (ja) | 2018-02-28 | 2023-01-17 | 東レ株式会社 | 樹脂組成物およびその成形品 |
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JP2021088686A (ja) * | 2019-12-06 | 2021-06-10 | LG Japan Lab株式会社 | 高分子及び繊維構造体を備えた高分子複合体 |
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JPWO2015137206A1 (ja) | 2017-04-06 |
KR20160132040A (ko) | 2016-11-16 |
CN106068346B (zh) | 2018-12-11 |
EP3118370A1 (en) | 2017-01-18 |
EP3118370A4 (en) | 2017-09-27 |
JP6179591B2 (ja) | 2017-08-16 |
CN106068346A (zh) | 2016-11-02 |
US10208173B2 (en) | 2019-02-19 |
EP3118370B1 (en) | 2019-08-07 |
US20170002154A1 (en) | 2017-01-05 |
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