Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
  • B29C73/04—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using preformed elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
  • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/06—Fibrous reinforcements only
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
  • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
  • B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/40—Shaping or impregnating by compression not applied
  • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
  • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
  • B29C73/04—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using preformed elements
  • B29C73/10—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using preformed elements using patches sealing on the surface of the article
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
  • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
  • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
  • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
• • 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
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/48—Polyethers
  • C08G18/4895—Polyethers prepared from polyepoxy compounds
• • 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
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/67—Unsaturated compounds having active hydrogen
  • C08G18/671—Unsaturated compounds having only one group containing active hydrogen
  • C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
• • 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
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
  • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
  • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
  • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
• • 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
• • 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
  • C08J5/241—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres
  • C08J5/243—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres using carbon fibres
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
  • C08J5/249—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs characterised by the additives used in the prepolymer mixture
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G23/00—Working measures on existing buildings
  • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G23/00—Working measures on existing buildings
  • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
  • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
  • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
  • B29K2105/0872—Prepregs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
  • B32B2260/02—Composition of the impregnated, bonded or embedded layer
  • B32B2260/021—Fibrous or filamentary layer
  • B32B2260/023—Two or more layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
  • B32B2260/04—Impregnation, embedding, or binder material
  • B32B2260/046—Synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
  • B32B2262/10—Inorganic fibres
  • B32B2262/106—Carbon fibres, e.g. graphite fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2305/00—Condition, form or state of the layers or laminate
  • B32B2305/07—Parts immersed or impregnated in a matrix
  • B32B2305/076—Prepregs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/542—Shear strength
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
  • B32B2309/02—Temperature
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
  • B32B2309/04—Time
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2419/00—Buildings or parts thereof
• • 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
  • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
  • C08J2375/04—Polyurethanes
  • C08J2375/14—Polyurethanes having carbon-to-carbon unsaturated bonds
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G23/00—Working measures on existing buildings
  • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
  • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
  • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements

Definitions

• the present invention relates to a structure reinforcement/repair method, and a structure obtained by the structure reinforcement/repair method.
• Reinforced fiber composite materials reinforced with reinforcing fibers such as carbon fiber and glass fiber are attracting attention for their excellent heat resistance and mechanical strength while being lightweight.
• Demand is increasing for use in various structural applications and for repairing civil engineering and construction materials.
• an intermediate material called prepreg in which reinforcing fibers are impregnated with a thermosetting resin, is used to harden and mold by autoclave molding or press molding.
• hand lay-up molding is performed by attaching a carbon fiber sheet to the repaired area and impregnating it with resin that hardens at room temperature.
• a pasting molding method is used.
• thermosetting resins such as epoxy resin compositions are generally used. It is used frequently. However, since the curing reaction of prepregs using epoxy resin is slow, high molding temperatures are required and curing progresses gradually even at room temperature. . Therefore, the development of a radically polymerizable resin composition capable of achieving high productivity and stability at room temperature is underway.
• reinforcing fiber sheets impregnated with thermosetting resin are pasted or wound on the surface, and then hardened at room temperature to reinforce the structure. - It is being repaired (see Patent Document 1).
• an FRP plate bonding method has been developed in which factory-produced plate-shaped fiber-reinforced plastic materials are bonded together using putty-like adhesive resin.
• this method uses plate-shaped fiber-reinforced plastic materials, there is a problem that it cannot be used to reinforce or repair structures with uneven or curved surfaces.
• the problem to be solved by the present invention is a structure reinforcement/repair method that is excellent in shortening the construction period and improving workability, and a structure that is excellent in mechanical strength obtained by using the structure reinforcement/repair method. is to provide
• the present inventors have found that by bonding a cured product obtained by curing a specific prepreg under specific conditions to a structure, the rapid curing (short-time curing) of the prepreg and A structure having the mechanical strength necessary for reinforcement and repair can be obtained by shortening the construction period and improving workability based on low-temperature curability, and by bonding and integrating the cured product to the surface of the structure.
• the present invention was completed by discovering a method for reinforcing and repairing structures that can be used.
• the present invention provides a method for reinforcing/repairing a structure, a) a step of laminating and shaping prepregs according to the shape of the surface of the structure; b) a step of vacuum-pressurizing the laminated and shaped prepreg; c) heat-curing the vacuum-pressurized prepreg to produce a cured prepreg; d) adhering the cured product to the surface of the structure;
• the prepreg contains a resin composition containing an ethylenically unsaturated group-containing resin (A) and a polymerization initiator (B), and reinforcing fibers (C),
• the present invention relates to a method for reinforcing/repairing a structure, wherein the polymerization initiator (B) has a 10-hour half-life temperature of 60 to 75°C.
• the ethylenically unsaturated group-containing resin (A) is preferably urethane (meth)acrylate and/or epoxy (meth)acrylate.
• the urethane (meth)acrylate is a reaction product of a compound having a hydroxyl group containing a polyisocyanate compound and a compound having a hydroxyl group and a (meth)acryloyl group. is preferred.
• the polyisocyanate compound is 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, a carbodiimide modified product of 4,4'-diphenylmethane diisocyanate, and polymethylene.
• At least one or more polyisocyanates selected from the group consisting of polyphenyl polyisocyanates are preferred.
• the gel time (100°C) of the prepreg is preferably 50 to 350 seconds.
• the prepreg preferably cures at 120°C or less and within 15 minutes.
• the melt viscosity (100° C.) of the resin composition is 0.00 in the dynamic viscoelasticity measurement under the conditions of a heating rate of 15° C./min and a frequency of 1 Hz. It is preferably 4 to 900 Pa ⁇ s.
• the present invention relates to a structure characterized by being obtained by the reinforcing/repairing method for the structure.
• the method for reinforcing and repairing a structure of the present invention uses a specific prepreg for a structure, and under specific conditions, integrates the structure and a cured product obtained using the prepreg, It is useful because a structure can be obtained that has improved workability and mechanical strength necessary for reinforcement and repair.
• the prepreg used in the present invention contains a resin composition containing an ethylenically unsaturated group-containing resin (A) and a polymerization initiator (B), and reinforcing fibers (C), and the polymerization initiator (
• the 10-hour half-life temperature of B) is 60 to 75°C.
• the reinforcing fiber (C) in the prepreg the cured product obtained from the prepreg and the structure are integrated to obtain excellent mechanical strength, and the polymerization initiator contained in the resin composition
• the half-life temperature of (B) is within the above range, low-temperature curability and rapid curability (short-term curability) advantageous for application can be achieved, which is useful.
• the ethylenically unsaturated group-containing resin (A) is not particularly limited, and may be a polymer or a monomer.
• urethane (meth)acrylate and/or epoxy (meth)acrylate are examples of urethane (meth)acrylate and/or epoxy (meth)acrylate.
• a styrene compound together with the urethane (meth)acrylate and epoxy (meth)acrylate, a styrene compound, a monofunctional (meth)acrylate compound, a hydroxyl group-containing (meth)acrylate compound, a di(meth)acrylate compound, and an inorganic
• These may contain saturated polyesters and the like, and may be used alone or in combination of two or more.
• the use of these ethylenically unsaturated group-containing resins (A) is preferable because the prepreg obtained is excellent in workability and moldability, and molded articles excellent in various physical properties such as heat resistance can be obtained.
• Epoxy (meth)acrylate The epoxy (meth)acrylate can be obtained by reacting an epoxy resin with (meth)acrylic acid and/or (meth)acrylic anhydride.
• the obtained prepreg is excellent in workability and moldability, and a molded article excellent in various physical properties such as heat resistance can be obtained, which is preferable.
• epoxy resins used for the epoxy (meth)acrylate include bisphenol type epoxy resins, novolac type epoxy resins, and oxazolidone-modified epoxy resins.
• the urethane (meth)acrylate is preferably a reaction product of a polyisocyanate compound and a compound having a hydroxyl group containing a compound having a hydroxyl group and a (meth)acryloyl group.
• the use of the urethane (meth)acrylate is preferable because the prepreg obtained is excellent in workability and moldability, and a molded article excellent in various physical properties such as heat resistance can be obtained.
• urethane (meth)acrylate from the viewpoint of obtaining molded articles excellent in various physical properties such as heat resistance, for example, polymethylene polyphenyl polyisocyanate, 4,4-diphenylmethane diisocyanate, hydroxyalkyl (meth)acrylate and bisphenol A and urethane (meth)acrylates composed of alkylene oxide adducts of.
• the polyisocyanate compound is selected from the group consisting of 2,4′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, carbodiimide-modified 4,4′-diphenylmethane diisocyanate, and polymethylene polyphenyl polyisocyanate. At least one or more polyisocyanates are preferred. It is preferable to use the polyisocyanate because the obtained urethane (meth)acrylate can be a molded article having excellent various physical properties such as heat resistance.
• the reinforcing fiber (C) has a high affinity for the surface of the reinforcing fiber (C).
• a prepreg having improved adhesion to the fiber (C) and a cured product using the prepreg can be obtained.
• the polymethylene polyphenyl polyisocyanate is represented by the following general formula (1). These polymethylene polyphenyl polyisocyanates can be used alone or in combination of two or more.
• n is an integer of 1 or more.
• polyisocyanate compound containing polymethylene polyphenyl polyisocyanate examples include "Millionate MR-100” and “Millionate MR-200” manufactured by Tosoh Corporation, and "WANNATE” manufactured by Wanhua Japan Co., Ltd. PM-200”, “WANNATE PM-400", “Cosmonate M-1500” manufactured by Mitsui Chemicals, Inc., "Boranate M-595" manufactured by Dow Chemical Co., Ltd., and the like.
• the polyisocyanate compound may contain diphenylmethane diisocyanate (MDI) in addition to the polymethylene polyphenyl polyisocyanate.
• MDI diphenylmethane diisocyanate
• the crosslink density of the resulting urethane (meth)acrylate can be adjusted, and a cured product having excellent toughness can be obtained, which is preferable.
• the diphenylmethane diisocyanate is at least one selected from the group consisting of 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, and carbodiimide modified 4,4'-diphenylmethane diisocyanate. is preferred.
• polyols having a number average molecular weight of 1000 or less such as a nurate modified product, a burette modified product, a urethane imine modified product, and diethylene glycol and dipropylene glycol of the diphenylmethane diisocyanate
• Aromatic polyisocyanate such as diphenylmethane diisocyanate modified polyol modified with, tolylene diisocyanate (TDI), tolidine diisocyanate, polymethylene polyphenyl polyisocyanate, xylylene diisocyanate, 1,5-naphthalene diisocyanate, tetramethylxylene diisocyanate Isocyanates;
• Alicyclic polyisocyanates such as isophorone diisocyanate (IPDI), hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diiso
• the compound having a hydroxyl group preferably contains a compound having a hydroxyl group and a (meth)acryloyl group.
• the urethane (meth)acrylate obtained by using the compound having a hydroxyl group and a (meth)acryloyl group is excellent in workability and moldability, excellent in various physical properties such as heat resistance, and useful.
• Examples of compounds having a hydroxyl group and a (meth)acryloyl group include hydroxyalkyl (meth)acrylates.
• these compounds having a hydroxyl group and a (meth)acryloyl group can be used alone or in combination of two or more.
• hydroxyalkyl (meth)acrylates examples include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxy-n-butyl (meth)acrylate, and 2-hydroxypropyl (meth)acrylate. , 2-hydroxy-n-butyl (meth)acrylate, 3-hydroxy-n-butyl (meth)acrylate and the like, and 2-hydroxyethyl (meth)acrylate is preferred.
• These hydroxyalkyl (meth)acrylates can be used alone or in combination of two or more.
• the compound having a hydroxyl group and a (meth)acryloyl group preferably ranges from 35 to 75% by mass, more preferably 40 to 70% by mass, from the viewpoint of heat resistance in the compound having a hydroxyl group. .
• the content of the compound having a hydroxyl group in the resin composition (solid content) used in the prepreg of the present invention is preferably in the range of 30 to 80% by mass, more preferably 35 to 75% by mass. is more preferred.
• the compound having a hydroxyl group it is preferable to use a polyol other than the compound having a hydroxyl group and a (meth)acryloyl group, since the toughness of the obtained cured product is further improved.
• Examples of the other polyol include, but are not limited to, alkylene oxide adducts of bisphenol A, alkylene oxide adducts of aromatic diols, polyester polyols, acrylic polyols, polyether polyols, polycarbonate polyols, polyalkylene polyols, and the like. be able to. These polyols can be used alone or in combination of two or more.
• the molar ratio (NCO/OH) between the isocyanate group (NCO) of the polyisocyanate compound and the hydroxyl group (OH) of the compound having a hydroxyl group, which is the raw material of the urethane (meth)acrylate, is the stability of the prepreg hardness. From the viewpoint of, 0.7 to 1.2 is preferable, and 0.9 to 1.0 is more preferable.
• styrene compound which is another ethylenically unsaturated group-containing resin (A) that can be contained (used) together with the urethane (meth)acrylate or epoxy (meth)acrylate
• examples of the styrene compound include styrene, methylstyrene, halogenated styrene, divinylbenzene and the like
• the monofunctional (meth)acrylate compounds include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth) acrylates, cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, benzyl (meth)acrylate, methylbenzyl (meth)acrylate, phenoxyethyl (meth)acrylate, methylphen
• di(meth)acrylate compound examples include dimethacrylate of an ethylene oxide adduct of bisphenol A, tricyclodecane dimethanol dimethacrylate, 1,12-dodecanediol dimethacrylate, hydrogenated bisphenol A dimethacrylate, polytetramethylene glycol dimethacrylate, 9,9-bis[4-(2-methacryloyloxyethoxy)phenyl]fluorene, Dimethacrylate of ethylene oxide adduct of isosorbide, dimethacrylate of ethylene oxide adduct of hydrogenated bisphenol A, trimethacrylate of ethylene oxide adduct of trimethylolpropane, tetramethacrylate of ethylene oxide adduct of pentaerythritol, dipentaerythritol Ethylene oxide adduct hexamethacrylate, ethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate
• Examples of the ⁇ , ⁇ -unsaturated dibasic acid used in preparing the unsaturated polyester include maleic acid, maleic anhydride, fumaric acid, itaconic acid, and itaconic anhydride.
• saturated dibasic acids include phthalic acid, phthalic anhydride, halogenated phthalic anhydride, isophthalic acid, terephthalic acid, tetrachlorophthalic acid, tetrachlorophthalic anhydride, dimer acid, 2,6-naphthalenedicarboxylic acid, 2 ,7-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic anhydride, 4,4′-biphenyldicarboxylic acid, and dialkyl esters thereof, aromatic dibasic acids, halogenated Saturated dibasic acid etc.
• the saturated dibasic acid may be used alone or in combination of two or more. It is preferable that the basic acid is 0 to 30 mol %.
• polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-propanediol, 1,3-butanediol, neopentyl glycol, hydrogen bisphenol A, 1,4-butanediol, 2-methyl-1,4-butanediol, 2-ethyl-1,4-butanediol, 1,5-pentanediol, cyclohexanedimethanol, 2,2,4 -trimethyl-1,3-pentanediol, 1,6-hexanediol, bisphenol A, bisphenol F, bisphenol S, tetrabromobisphenol A represented by dihydric phenol and propylene oxide
• the polymerization initiator (B) has a 10-hour half-life temperature of 60 to 75°C, preferably 60 to 70°C. As long as it is the polymerization initiator (B), it is not particularly limited. Organic peroxides are preferred from the viewpoint of shortening the molding time (rapid curability).
• organic peroxide examples include diacyl peroxide compounds, peroxyester compounds, hydroperoxide compounds, ketone peroxide compounds, alkyl perester compounds, percarbonate compounds, peroxyketals, and the like. It can be selected as appropriate.
• These polymerization initiators (B) can be used alone or in combination of two or more.
• the prepreg has a long life at room temperature and can be cured in a short time (within 15 minutes) by heating (rapid curing).
• the prepreg of the present invention is preferable because it has low-temperature curability that is advantageous during construction, and curability and moldability are further improved by using the prepreg of the invention.
• the content of the polymerization initiator (B) is 0.3 to 3.0% by mass in the resin composition (solid content) used in the prepreg of the present invention, since both curing characteristics and storage stability are excellent. is preferred, and 0.5 to 2.5% by mass is more preferred.
• the melt viscosity (100° C.) of the resin composition used for the prepreg of the present invention was measured using a viscoelasticity measuring device (MCR302, manufactured by Anton Paar Japan Co., Ltd., measuring jig diameter 25 mm) at a heating rate of 15° C. /min and a frequency of 1 Hz, it is preferably 0.4 to 900 Pa ⁇ s, more preferably 1 to 450 Pa ⁇ s.
• MCR302 manufactured by Anton Paar Japan Co., Ltd., measuring jig diameter 25 mm
• the melt viscosity is within the range, when the reinforcing fiber (C) is coated and impregnated with the resin composition, the product basis weight (mass) is stable, and the quality of the obtained prepreg product is improved. It becomes stable (product stability) and useful.
• the reinforcing fiber (C) is not particularly limited, but from the viewpoint of mechanical strength and durability, carbon fiber is preferable, and more preferably, high-strength carbon fiber can be obtained.
• carbon fiber is preferable, and more preferably, high-strength carbon fiber can be obtained.
• Various types such as rayon-based fibers can be used, and among them, polyacrylonitrile-based fibers are preferable because high-strength carbon fibers can be easily obtained.
• the shape of the reinforcing fiber (C) is not particularly limited, and includes a reinforcing fiber tow in which reinforcing fiber filaments are bundled, a unidirectional material in which reinforcing fiber tows are aligned in one direction, a woven fabric, or a short cut reinforcing fiber. Although a nonwoven fabric made of this material can be mentioned, it is preferable to use a unidirectional material as the reinforcing fiber, and to obtain high mechanical properties by laminating and molding.
• the content of the reinforcing fiber (C) in the prepreg of the present invention is preferably in the range of 35 to 85% by mass, more preferably in the range of 45 to 75% by mass, because the mechanical strength of the resulting cured product is further improved. is more preferred.
• thermosetting resins such as thermosetting resins, thermoplastic resins, polymerization inhibitors, curing accelerators, fillers, low shrinkage agents, and release agents.
• a thickener such as a viscosity reducer, a pigment, an antioxidant, a plasticizer, a flame retardant, an antibacterial agent, an ultraviolet stabilizer, a reinforcing material, a photocuring agent, and the like.
• the prepreg of the present invention is formed in an uncured or semi-cured state by reacting the resin composition and using the prepreg of the present invention. It is preferable because it can achieve high heat resistance and rapid curability (short-time curability), and is excellent in shortening the construction period and workability.
• the method for producing the prepreg is not particularly limited, and a known method can be used.
• the ethylenically unsaturated group-containing resin (A) can be (For example, a polyisocyanate compound and a urethane (meth) acrylate which is a reaction product of a compound having a hydroxyl group containing a compound having a hydroxyl group and a (meth) acryloyl group), a polymerization initiator (B) (for example, an organic peroxide material), and other components (e.g., polyol corresponding to the compound having a hydroxyl group) are mixed into a resin composition (solution), impregnated with reinforcing fibers (C) (e.g., carbon fibers), and further, from the top surface Sandwiching with release paper or release film, rolling with a rolling mill to obtain a sheet (step 1), followed by an isocyanate group possessed by the polyisocyanate compound and a compound having
• the reaction temperature is about 40 to 80° C.
• the reaction time is about 1 to 30 minutes.
• the polyisocyanate and the compound having a hydroxyl group may be partially reacted in advance to the extent that the impregnation of the reinforcing fibers (C) is not impaired.
• the prepreg sandwiched by release paper or the like is aged at 10 to 50° C. for 12 to 48 hours (step 3) to obtain a prepreg used for preparing a cured product.
• the thickness of the prepreg of the present invention is preferably 15 to 1000 ⁇ m, It is more preferably 20 to 500 ⁇ m. By adjusting the thickness to the above range, handling becomes easy when laminating the prepreg, and impregnation of the resin composition becomes satisfactory, which is preferable.
• the prepreg is preferably cured at a heating temperature of 120°C or less and within 15 minutes for a heating time, and more preferably at a temperature of 115°C or less and within 12 minutes.
• a heating temperature 120°C or less and within 15 minutes for a heating time
• a temperature of 115°C or less and within 12 minutes are within the above ranges.
• the gel time (100°C) of the prepreg is preferably 50 to 350 seconds, more preferably 70 to 320 seconds. When the gel time is within the above range, workability and moldability are excellent, which is preferable.
• the present invention relates to a structure characterized by being obtained by the reinforcing/repairing method for a structure.
• the structure preferably has excellent mechanical strength and durability because the cured prepreg is integrated.
• the present invention provides a method for reinforcing and repairing a structure, a) a step of laminating and shaping prepregs according to the shape of the surface of the structure; b) a step of vacuum-pressurizing the laminated and shaped prepreg; c) heat-curing the vacuum-pressurized prepreg to produce a cured prepreg; and d) bonding the cured product to the surface of the structure.
• the prepreg containing reinforcing fibers is laminated or shaped according to the shape of the surface of the structure, so that it conforms to the shape of the surface.
• a prepreg is prepared (step a)).
• the prepreg conforming to the shape of the surface is placed in a vacuum pack or the like and vacuum-pressurized to prepare a vacuum-packed prepreg while maintaining the shape of the prepreg (step b)).
• the curing reaction is accelerated to prepare a cured product of the prepreg (step c)).
• the cured product exists in a vacuum pack, the cured product is taken out from the vacuum pack.
• vacuum-packing and curing it is possible to obtain a cured product conforming to the surface shape.
• a cured product that matches the shape of the surface is adhered (bonded) using an adhesive, and the structure and the cured product are integrated ( step d)).
• the structure can be reinforced and repaired, for example, by bonding the cured product according to the surface shape of the defect or defect. It has excellent mechanical strength and is useful.
• the adhesive a known adhesive can be used, for example, a two-liquid type adhesive using an epoxy resin or the like can be used.
• Specific examples of the adhesive include a room-temperature curing two-liquid epoxy adhesive manufactured by ThreeBond and a two-liquid mixing type room-temperature curing adhesive manufactured by Konishi Co., Ltd. whose main components are epoxy resin and silicone polymer.
• Preparation of cured product As a method for preparing a cured product by performing final curing using the prepreg, a plurality of prepregs are used, laminated or shaped according to the shape of the surface of the structure, vacuum packed, and the above By heating the prepreg that matches the shape of the surface together with the vacuum pack and performing final curing, a plurality of prepregs are adhered to each other, and a cured product (laminate) that matches the shape of the surface can be prepared. Further, the degree of vacuum attained by the vacuum pack is preferably ⁇ 50 kPa or less, more preferably ⁇ 90 kPa or less.
• a method of obtaining a cured product using the prepreg after laminating 2 to 30 sheets of the prepreg, vacuum packing is performed at -50 kPa to -90 kPa, and a heating oven or the like is heated to 100 ° C. to 160 ° C. in advance.
• a heating oven or the like By heating, putting the vacuum-packed laminated prepreg in the heating oven or the like, and heating and holding for 1 to 15 minutes, the prepreg that matches the shape of the surface is cured and a cured product can be obtained.
• a method or the like is used in which the cured product is taken out from the vacuum pack to obtain a cured product conforming to the shape of the surface.
• the hydroxyl equivalent (g/eq) of the polyol or the like used the value measured by the neutralization titration method specified in JIS K0070 (1992) was used.
• the hydroxyl equivalent weight of the polyol is preferably 50 to 400 g/eq, more preferably 90 to 300 g/eq.
• melt viscosity of resin composition (100°C) The melt viscosity at 100° C. of the resin composition used in the present invention was evaluated by dynamic viscoelasticity measurement using a viscoelasticity measuring device (MCR302, manufactured by Anton Paar Japan Co., Ltd., measuring jig diameter 25 mm). The dynamic viscoelasticity measurement was performed under the following conditions. Temperature conditions: Room temperature (23°C) to 150°C Heating rate: 15°C/min Frequency: 1Hz
• the melt viscosity (100° C.) of the resin composition is preferably 0.4 to 900 Pa ⁇ s, more preferably 1 to 450 Pa ⁇ s.
• the release film was peeled off from both sides of the prepreg, and the gel time of the prepreg from which the release film was peeled was measured at 100 ° C. and 110 ° C., respectively, by a method based on the curing property test specified in JASO M 406-87. Twenty-four samples cut into 5 cm pieces were laminated, and the gel time (seconds) was measured using the laminated prepreg.
• the gel time at 100° C. is preferably 50 to 350 seconds, more preferably 70 to 320 seconds.
• the gel time at 110° C. is preferably 20 to 300 seconds, more preferably 30 to 200 seconds.
• Example 1 (Preparation of resin composition (1) for prepreg) A mixture of polymethylene polyphenyl polyisocyanate and 4,4'-diphenylmethane diisocyanate ("Millionate MR-200" manufactured by Tosoh Corporation) 50 parts by mass, 4,4'-diphenylmethane diisocyanate 50 parts by mass, 2-hydroxyethyl methacrylate ( HEMA) 66 parts by mass, Newpol BPE-20 (manufactured by Sanyo Chemical Co., Ltd.: EO adduct of bisphenol A, hydroxyl equivalent; 164 g / eq) 25 parts by mass, Newpol BPE-40 (manufactured by Sanyo Chemical Co., Ltd.: bisphenol A EO adduct, hydroxyl equivalent: 204 g / eq) 31 parts by mass, and a polymerization initiator (Kayaku Nourion Co., Ltd.
• Millionate MR-200 manufactured by Tosoh Corporation
• the prepreg (1) is vacuum-packed using a vacuum packing machine at a vacuum level of ⁇ 90 kPa, placed in an oven preheated to 100° C. and 110° C. for 10 minutes, and held therein. was cured to obtain a cured product, and the moldability of the cured product at each temperature was evaluated.
• Trigonox 122-80C 1,1-di (tert-amylperoxy) cyclohexane, 3 parts by mass of 10-hour half-life temperature of 87°C) were mixed at room temperature (23°C), placed in a polyethylene bag, and aged at 45°C for 24 hours to obtain a prepreg resin composition (R1) (100°C Melt viscosity: 375 Pa ⁇ s) was obtained.
• R1 100°C Melt viscosity: 375 Pa ⁇ s
• prepreg (R1)) A mixture of polymethylene polyphenyl polyisocyanate and 4,4'-diphenylmethane diisocyanate ("Millionate MR-200" manufactured by Tosoh Corporation) 50 parts by mass, 4,4'-diphenylmethane diisocyanate 50 parts by mass, 2-hydroxyethyl methacrylate ( HEMA) 66 parts by mass, Newpol BPE-20 (manufactured by Sanyo Chemical Co., Ltd.: EO adduct of bisphenol A, hydroxyl equivalent; 164 g / eq) 25 parts by mass, Newpol BPE-40 (manufactured by Sanyo Chemical Co., Ltd.: bisphenol A EO adduct of, hydroxyl equivalent: 204 g / eq) 31 parts by mass, and a polymerization initiator (Kayaku Nourion Co., Ltd.
• Example 1 a desired prepreg was used, and a cured product excellent in moldability and interlaminar shear strength was obtained by going through a step of vacuum pressurization at 100 ° C. did it.
• Example 2 a desired prepreg was used, and a cured product excellent in moldability and interlaminar shear strength was obtained by undergoing a step of vacuum pressurization at 110 ° C. according to the decomposition temperature of the organic peroxide. It was confirmed that On the other hand, in Comparative Examples 1 and 2, the same prepreg as in Examples 1 and 2 was used, but the step of vacuum pressurization was not performed, so that the cured product was inferior in moldability and interlaminar shear strength. was confirmed.
• Example 2 In Example 2 and Comparative Example 2, an attempt was made to obtain a cured product (cured plate) by heating the prepreg at 100°C. Because of the high viscosity, the low-temperature curability was poor, and a cured product itself could not be obtained.
• Comparative Example 3 the 10-hour half-life temperature of the polymerization initiator (B) used in producing the prepreg was not within the desired range, and a high temperature was used. However, the performance of the organic peroxide was insufficient, the gel time could not be measured, and the cured product itself could not be obtained.
• a cured product obtained by curing a specific prepreg under specific conditions is adhered to the structure, thereby shortening the construction period based on the fast curing (short-time curing) and low-temperature curing properties of the prepreg.
• Workability is improved, and by bonding and integrating the cured product to the surface of the structure, a structure having the mechanical strength necessary for reinforcement and repair can be obtained.
• It can be used as a vehicle member, an aerospace aircraft member, a ship member, a housing equipment member, a sports member, a light vehicle member, a construction and civil engineering member, and a housing for OA equipment, etc. suitable for use.

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