WO2015046199A1 - Composition adhésive magnétisable du type durcissement thermique et feuille adhésive - Google Patents

Composition adhésive magnétisable du type durcissement thermique et feuille adhésive Download PDF

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Publication number
WO2015046199A1
WO2015046199A1 PCT/JP2014/075187 JP2014075187W WO2015046199A1 WO 2015046199 A1 WO2015046199 A1 WO 2015046199A1 JP 2014075187 W JP2014075187 W JP 2014075187W WO 2015046199 A1 WO2015046199 A1 WO 2015046199A1
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WO
WIPO (PCT)
Prior art keywords
heat
adhesive composition
magnetic adhesive
curable magnetic
epoxy resin
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PCT/JP2014/075187
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English (en)
Japanese (ja)
Inventor
悟 須藤
小野　義友
Original Assignee
リンテック株式会社
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Publication date
Application filed by リンテック株式会社 filed Critical リンテック株式会社
Priority to JP2015539232A priority Critical patent/JPWO2015046199A1/ja
Priority to KR1020167010475A priority patent/KR20160063354A/ko
Priority to CN201480052657.0A priority patent/CN105579544B/zh
Publication of WO2015046199A1 publication Critical patent/WO2015046199A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/01—Magnetic additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/304—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2463/00—Presence of epoxy resin

Definitions

  • the present invention relates to a heat-curable magnetic adhesive composition and a heat-curable magnetic adhesive sheet suitable for joining two or more adherends of which at least one is a ferromagnetic material, and a joined body using them. It relates to the manufacturing method of
  • an adhesive sheet is used to join a member such as a reinforcing material to a steel plate such as a door of an automobile, for example. If the adhesive sheet has a large adhesive strength at the initial stage of bonding, the adhesive sheet is difficult to reattach or the adhesive sheet can be reattached when the position of the member with respect to the steel plate is shifted. There is a problem that the adhesive of the above remains on the surface of the steel plate. Therefore, in the initial stage of bonding, there is a demand for an adhesive sheet having good workability which can be temporarily fixed without adhesive force and can be firmly bonded thereafter.
  • the adhesive sheet which consists of an adhesive composition containing acrylic rubber and magnetic powder may be used.
  • the adhesive sheet using acrylic rubber in this way has a low shear force, and there is a problem that the adhered members are shifted with time.
  • Patent Document 1 proposes an adhesive sheet using an adhesive composition containing a hot melt adhesive and a ferromagnetic material.
  • the adhesive sheet is interposed between one member made of a ferromagnetic material and another member made of a ferromagnetic material, and both members are temporarily fixed and then heated. Bond the two parts together.
  • the shear force is maintained high by using a hot melt adhesive.
  • the hot melt adhesive softens again and loses its adhesive strength, which causes a problem of low heat resistance.
  • An object of the present invention is to provide an adhesive composition, a heat-curable magnetic adhesive sheet, and a method for producing a joined body using them.
  • the present invention is heat-cured containing an acrylic polymer (A), an epoxy resin (B), a curing agent (C) and a ferromagnetic material (D).
  • Type magnetic adhesive composition wherein the epoxy resin (B) contains at least one selected from the group consisting of cresol novolac type epoxy resin, phenol novolac type epoxy resin and bisphenol type epoxy resin
  • the heat-curable magnetic adhesive composition is provided (Invention 1).
  • the magnetic force by the ferromagnetic material (D), and in some cases, the acrylic polymer (A) in the initial stage (before heat-curing) The adhesive strength (preferably fine adhesive strength) of the epoxy resin (B) before curing and before curing shows a good temporary fixing power to the ferromagnetic material. After the heat curing, the cured epoxy resin (B) has high adhesion and shear force. Further, the adhesive obtained by heat-hardening the above-mentioned heat-curable magnetic adhesive composition is excellent in heat resistance because it does not soften or melt even when it is reheated, particularly by the hardened epoxy resin (B).
  • the content of the ferromagnetic material (D) in the heat-curable magnetic adhesive composition is preferably 5 to 60% by volume (Invention 2).
  • the content of the ferromagnetic material (D) in the heat-curable magnetic adhesive composition is 100 parts by mass of the acrylic polymer (A) in terms of solid content. Preferably, it is 10 to 5000 parts by mass with respect to (Invention 3).
  • the content of the epoxy resin (B) in the heat-curable magnetic adhesive composition is 100 parts by mass of the acrylic polymer (A) in terms of solid content. On the other hand, it is preferably 5 to 3000 parts by mass (invention 4).
  • the curing agent (C) is preferably an amine curing agent (Invention 5).
  • the present invention provides a heat-curable magnetic adhesive sheet in which the heat-curable magnetic adhesive composition (inventions 1 to 5) is formed into a sheet (invention 6).
  • the thickness is preferably 0.1 to 5 mm (Invention 7).
  • a third aspect of the present invention is a method for producing a joined body obtained by joining two or more adherends of which at least one is a ferromagnetic material, wherein the heat-curable magnetic adhesive composition (invention 1) ⁇ 5) or the heat-curable magnetic adhesive sheet (inventions 6 and 7), the two or more adherends are temporarily fixed, and after the temporary fixing, the heat-curable magnetic adhesive
  • the present invention provides a method for producing a joined body, comprising heating the composition or the heat-curable magnetic adhesive sheet and bonding the two or more adherends (Invention 8).
  • the heat-curable magnetic adhesive composition and the heat-curable magnetic adhesive sheet according to the present invention show temporary fixing power by magnetic force in the initial stage, and also have high shear force after heat-hardening and heat resistance. Excellent. Moreover, according to the method of manufacturing a joined body according to the present invention, bonding work can be performed with excellent workability, and a joined body having high shear force and excellent heat resistance can be obtained.
  • the heat-curable magnetic adhesive composition according to the present embodiment (hereinafter sometimes simply referred to as "adhesive composition") comprises an acrylic polymer (A), an epoxy resin (B), and a cured product. It contains an agent (C) and a ferromagnetic substance (D).
  • the epoxy resin (B) contains at least one selected from the group consisting of cresol novolac epoxy resin, phenol novolac epoxy resin and bisphenol epoxy resin.
  • the heat-curable magnetic adhesive composition containing the above components has a magnetic force due to the ferromagnetic material (D), and in some cases, an acrylic polymer (A) and before curing.
  • the adhesive force (preferably minute adhesive force) of the epoxy resin (B) of the present invention shows a good temporary fixing force to the ferromagnetic material.
  • the cured epoxy resin (B) has high adhesion and shear force.
  • an adhesive obtained by heat-curing a heat-curable magnetic adhesive composition containing the above components, particularly an epoxy resin (B) is excellent in heat resistance because it does not soften or melt even if it is reheated. . Furthermore, by not melting, it is hard to produce thickness change by a line of magnetic force.
  • Acrylic polymer (A) An acrylic polymer (A) is a polymer which has (meth) acrylic acid ester as a main component as a monomer unit which comprises the said polymer.
  • (meth) acrylic acid ester means both acrylic acid ester and methacrylic acid ester.
  • Other similar terms are also the same.
  • the acrylic polymer (A) contained in the heat-curable magnetic adhesive composition according to the present embodiment is preferably acrylic rubber.
  • “acrylic rubber” in the present specification means a homopolymer consisting of a constituent unit derived from (meth) acrylic acid ester, a copolymer consisting of a constituent unit derived from (meth) acrylic acid ester, A polymer selected from the group consisting of one or more selected from the group consisting of a copolymer of a constituent unit derived from (meth) acrylic acid ester and a constituent unit derived from a polymerizable monomer other than (meth) acrylic acid ester; Alternatively, it means a material containing a cross-linked reaction product of the polymer and a cross-linking agent (preferably a curing agent (C)) and having mechanical properties as a rubbery elastomer.
  • the heat-curable magnetic adhesive composition according to the present embodiment contains an acrylic rubber as the acrylic polymer (A), the heat-curable magnetic adhesive composition exhibits good flexibility.
  • the (meth) acrylic acid ester having an acrylic polymer (A) as a main component as a monomer unit constituting the polymer is a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group Is preferred.
  • a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group Is preferred By containing such (meth) acrylic acid alkyl ester, desired elasticity and / or tackiness (slight tackiness) can be expressed.
  • Examples of the (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate and n- (meth) acrylate.
  • (meth) acrylic acid ester having 1 to 8 carbon atoms, particularly 2 to 4 carbon atoms in the alkyl group is preferable, and ethyl (meth) acrylate and (meth) acrylate Particularly preferred is n-butyl acrylate. These may be used alone or in combination of two or more.
  • the acrylic polymer (A) preferably contains 50 to 100% by mass of (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group as a monomer unit constituting the polymer, particularly 75 It is preferable to contain up to 99% by mass, and more preferable to contain 92 to 98% by mass.
  • the acrylic polymer (A) contains a monomer having a functional group as a monomer unit constituting the polymer so as to impart desired properties to the adhesive composition to be obtained or the adhesive after curing.
  • the resulting acrylic polymer (A) is crosslinked by the crosslinking agent (curing agent (C)) (usually at the time of heat-forming of the adhesive composition), and has good elasticity. Demonstrate.
  • an acrylic polymer (A) having a crosslinked structure (three-dimensional network structure) formed thereon is bonded to the epoxy resin (B) via the curing agent (C) to be entangled with each other. It is estimated to be.
  • the cured adhesive exhibits excellent heat resistance.
  • a carboxyl group, a hydroxyl group, an epoxy group, halogen etc. are mentioned, for example.
  • the crosslinking agent preferably the curing agent (C)
  • a carboxyl group having high reactivity with an amine is preferred.
  • Examples of the monomer having a carboxyl group include, for example, ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid and the like, among which acrylic acid or methacrylic Acids are preferred and acrylic acid is particularly preferred. These may be used alone or in combination of two or more.
  • the acrylic polymer (A) preferably contains 0.1 to 10% by mass of a carboxyl group-containing monomer as a monomer unit constituting the polymer, In particular, the content is preferably 1 to 5% by mass, and more preferably 2 to 4% by mass.
  • crosslinking is favorably acquired as content of a carboxyl group-containing monomer is 0.1 mass% or more. Further, when the content of the carboxyl group-containing monomer is 10% by mass or less, the flexibility of the heat-curable magnetic adhesive composition can be well maintained even after crosslinking.
  • the acrylic polymer (A) is, as a monomer unit constituting the polymer, other monomers, for example, (meth) acrylic acid alkoxy alkyl ester such as methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate and the like , Non-crosslinkable acrylamide such as acrylamide and methacrylamide, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate and other non-crosslinkable tertiary amino groups (Meth) acrylic acid ester, (meth) acrylic acid ester having an aliphatic ring such as cyclohexyl (meth) acrylate, etc. (meth) acrylic acid ester having an aromatic ring such as phenyl (meth) acrylate, vinyl acetate, It may contain styrene or the like.
  • the polymerization mode of the acrylic polymer (A) may be a random copolymer or a block copolymer.
  • the mass average molecular weight (Mw) of the acrylic polymer (A) is preferably 500,000 to 2,500,000, particularly preferably 800,000 to 2,000,000, and still more preferably 1,000,000 to 1,500,000.
  • the mass mean molecular weight in this specification is a value of standard polystyrene conversion measured by gel permeation chromatography (GPC) method.
  • the mass average molecular weight of the acrylic polymer (A) is 500,000 or more, the tackiness of the obtained adhesive composition before curing is suppressed, and when the mass average molecular weight is 2,500,000 or less, the obtained curing is achieved.
  • the tack of the previous adhesive composition is such that it can be easily peeled off by hand. Therefore, the adhesive force suitable for temporary fixation can be acquired because the mass mean molecular weight of acrylic polymer (A) exists in said range.
  • the (acrylic polymer (A) may be used alone or in combination of two or more. .
  • Epoxy resin (B) The epoxy resin (B) contained in the heat-curable magnetic adhesive composition according to this embodiment contains at least one selected from the group consisting of cresol novolac epoxy resin, phenol novolac epoxy resin, and bisphenol epoxy resin. contains. Thereby, the adhesive after curing the adhesive composition exhibits desired adhesive strength, shear force and heat resistance.
  • cresol novolac epoxy resin for example, those represented by the following formula can be used. (Wherein n is an integer of 1 to 60)
  • the mass average molecular weight of the cresol novolac epoxy resin is preferably 1,000 to 10,000, and particularly preferably 1,500 to 5,000.
  • the epoxy equivalent is preferably 100 to 300 g / eq, and more preferably 200 to 230 g / eq.
  • those having a softening point of 30 to 150 ° C. are preferable, and those having a softening point of 50 to 100 ° C. are particularly preferable.
  • phenol novolac epoxy resin for example, those represented by the following formula can be used. (Wherein n is an integer of 1 to 60)
  • the phenol novolac epoxy resin preferably has a weight average molecular weight of 500 to 10,000, and more preferably 1,000 to 3,000.
  • the epoxy equivalent is preferably 100 to 300 g / eq, and more preferably 170 to 210 g / eq. Furthermore, those which are semisolid at normal temperature are preferable.
  • bisphenol-type epoxy resin examples include bisphenol A-type epoxy resin, bisphenol F-type epoxy resin, and bisphenol AD-type epoxy resin. Among them, bisphenol A-type epoxy resin is preferable.
  • n is an integer of 1 to 80
  • the bisphenol type epoxy resin preferably has a mass average molecular weight of 1,000 to 20,000, and particularly preferably 3,000 to 8,000.
  • the epoxy equivalent is preferably 400 to 1300 g / eq, and particularly preferably 700 to 1000 g / eq.
  • those having a softening point of 50 to 150 ° C. are preferable, and those having a softening point of 80 to 100 ° C. are particularly preferable.
  • cresol novolac epoxy resins and phenol novolac epoxy resins are preferable, and phenol novolac epoxy resins are particularly preferable.
  • the adhesive after curing exerts excellent adhesion and shear force, and the adhesive composition before curing is good Demonstrate flexibility.
  • the phenol novolac epoxy resin is semisolid at normal temperature, the effect of flexibility is remarkable.
  • the acrylic polymer (A) is an acrylic rubber, in particular, the combination with the acrylic rubber makes the adhesive composition more excellent in flexibility.
  • the sheet-like adhesive composition can be made to follow the three-dimensional curved surface well.
  • a bisphenol-type epoxy resin preferably, bisphenol A-type epoxy resin
  • the flexibility of the adhesive composition is secured by adjusting the amount to be small. can do.
  • said epoxy resin (B) can be used individually by 1 type or in combination of 2 or more types, in order to balance the tack force before hardening, and the shearing force after hardening, 2 or more types are used. It is particularly preferable to contain both an epoxy resin which is solid at normal temperature and an epoxy resin which is semi-solid at normal temperature.
  • the content of the epoxy resin (B) in the heat-curable magnetic adhesive composition according to the present embodiment is 5 to 3000 parts by mass relative to 100 parts by mass of the acrylic polymer (A) in terms of solid content. It is preferably 10 to 2000 parts by mass, and more preferably 30 to 500 parts by mass.
  • the said effect by the said epoxy resin (B) is exhibited favorably as content of an epoxy resin (B) is 5 mass parts or more. Moreover, it is suppressed that the elasticity by an acrylic polymer (A) is inhibited as content of an epoxy resin (B) is 3000 mass parts or less.
  • Hardening agent (C) The curing agent (C) contained in the heat-curable magnetic adhesive composition according to this embodiment can cure the epoxy resin (B) by heating.
  • the acrylic polymer (A) has a functional group that reacts with the curing agent (C)
  • the acrylic polymer (A) is crosslinked.
  • a compound having two or more functional groups capable of reacting with an epoxy group in one molecule is preferably used.
  • the functional group include phenolic hydroxyl group, alcoholic hydroxyl group, amino group, carboxyl group, acid anhydride and the like. Among them, amino group and phenolic hydroxyl group are preferable, and amino group is particularly preferable. That is, as a curing agent (C), an amine curing agent and a phenol curing agent are preferable, and an amine curing agent is particularly preferable.
  • the amine curing agent has high reactivity with the epoxy resin (B), and also has high reactivity with the acrylic polymer (A) when the acrylic polymer (A) has a carboxyl group. Furthermore, the acrylic polymer (A) crosslinked by the amine curing agent is particularly excellent in heat resistance.
  • amine curing agents examples include dicyandiamide, 4,4'-diaminodiphenylamine, 4,4'-diaminodiphenylsulfone, aromatic amines such as m-phenylenediamine, m-xylylenediamine, etc. Dicyandiamide is preferred.
  • curing agent a phenol novolak resin, bisphenol A novolak resin, a triazine modified
  • curing agent (C) can be used individually by 1 type or in combination of 2 or more types.
  • the content of the curing agent (C) in the heat-curable magnetic adhesive composition according to the present embodiment is 0.02 to 15 parts by mass with respect to 100 parts by mass of the epoxy resin (B) in terms of solid content. And particularly preferably 0.1 to 10 parts by mass, and further preferably 0.3 to 4 parts by mass. Curing of the epoxy resin (B) (and crosslinking of the acrylic polymer (A)) is favorably achieved when the content of the curing agent (C) is 0.02 parts by mass or more. On the other hand, if the content of the curing agent (C) is too large, it may be unnecessarily left in the adhesive, which may be economically disadvantageous.
  • the heat-curable magnetic adhesive composition according to the present embodiment preferably contains a curing catalyst that accelerates or adjusts the reaction between the epoxy resin (B) and the curing agent (C). .
  • tertiary amines such as triethylenediamine, benzyldimethylamine, triethanolamine, dimethylaminoethanol and tris (dimethylaminomethyl) phenol
  • 2-methylimidazole, 2-phenylimidazole, 2-phenyl- Imidazoles such as 4-methylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole
  • Organic phosphines such as tributyl phosphine, diphenyl phosphine, triphenyl phosphine, etc.
  • Tetraphenyl boron salts such as tetraphenyl phosphonium tetraphenyl borate and triphenyl phosphine tetraphenyl borate, etc. are mentioned.
  • imidazoles are preferable, and 2-phenyl-4,5-dihydroxymethylimidazole is particularly preferably used. These can be used singly or in combination of two or more.
  • the content of the curing catalyst in the heat-curable magnetic adhesive composition according to the present embodiment is 0 based on 100 parts by mass of the total amount of the epoxy resin (B) and the curing agent (C) in terms of solid content.
  • the content is preferably from 0.01 to 7 parts by mass, particularly preferably from 0.05 to 5 parts by mass, and further preferably from 0.15 to 2 parts by mass.
  • the ferromagnetic material (D) used for the heat-curable magnetic adhesive composition according to the present embodiment is a substance capable of having spontaneous magnetization without an external magnetic field, and also includes a ferrimagnetic material.
  • the ferromagnetic substance (D) include metals such as iron, nickel and cobalt, alloys thereof (for example, stainless steel) or oxides, strontium ferrite, barium ferrite, manganese zinc ferrite, nickel zinc ferrite, Magnetic materials such as ferrites such as copper-zinc ferrites, alnicos such as aluminum-nickel-cobalt alloys, and rare earths such as rare earths-transition metals (eg SmCo, SmFeN and NbFeB) may be mentioned.
  • ferrites are preferable, and strontium ferrite and barium ferrite are more preferable among them.
  • the ferromagnetic material (D) is preferably a powder (hereinafter referred to as "magnetic powder").
  • the average particle diameter of the magnetic powder is preferably 0.5 to 20 ⁇ m, particularly preferably 0.5 to 15 ⁇ m, and further preferably 1 to 5 ⁇ m.
  • the average particle size of the magnetic powder can be measured, for example, by the Coulter counter method.
  • the content of the ferromagnetic material (D) (magnetic powder) in the heat-curable magnetic adhesive composition according to the present embodiment is preferably 5 to 60% by volume, particularly 10 to 50% by volume It is preferably 20 to 40% by volume.
  • the content of the ferromagnetic material (D) is 5% by volume or more, the temporary fixing force to the ferromagnetic material is exerted by the magnetic force of the ferromagnetic material (D) in the initial stage (before heat curing).
  • the content of the ferromagnetic substance (D) is 60% by volume or less, inhibition of the action and effect by the other components, in particular, the flexibility and the shear force is suppressed.
  • the content of the ferromagnetic material (D) in the heat-curable magnetic adhesive composition according to the present embodiment is 10 to 10 parts by mass with respect to 100 parts by mass of the acrylic polymer (A) in terms of solid content.
  • the amount is preferably 5000 parts by mass, particularly preferably 50 to 2000 parts by mass, and still more preferably 150 to 700 parts by mass.
  • the content of the ferromagnetic material (D) is 10 parts by mass or more, the temporary fixing force to the ferromagnetic material is exerted by the magnetic force of the ferromagnetic material (D) in the initial stage (before heat curing).
  • the content of the ferromagnetic material (D) is 5000 parts by mass or less, the flexibility is good without the hardness being too high, and a sufficient shearing force can be maintained.
  • the heat-curable magnetic adhesive composition according to the present embodiment is, for example, one of a crosslinking agent, a tackifier, an antioxidant, a filler, and a dispersing agent, in addition to the above components. You may contain the above suitably.
  • the curing agent (C), the ferromagnetic material (D), preferably the curing catalyst, and, if desired, other components may be blended and mixed. At this time, the components are well dispersed by heating the mixture at about 20 to 120.degree.
  • the ferromagnetic material (D) mixed with the heat-curable magnetic adhesive composition as described above may be in a magnetized state or may not be in a magnetized state. Good. In the latter case, after mixing, after the adhesive composition is obtained, it may be magnetized (magnetized).
  • the magnetization can be performed by a known method, for example, using a commercially available magnetization / demagnetization power supply or the like.
  • the heat-curable magnetic adhesive composition according to the present embodiment has a magnetic force at an initial stage (before heat-curing). And, in some cases, adhesion (preferably, fine adhesion), exhibit excellent temporary fixation to ferromagnetic materials. And the adhesive agent formed by heat-hardening the heat-hardenable-type magnetically sensitive adhesive composition which concerns on this embodiment shows high shear force. In addition, the adhesive does not soften or melt even if it is reheated, so it is excellent in heat resistance, and furthermore, the thickness change due to the magnetic lines of force does not occur.
  • the heat-curable magnetic adhesive composition according to the present embodiment contains an acrylic rubber as the acrylic polymer (A) and a semi-solid one at room temperature as the epoxy resin (B), it forms a sheet. When you do, you can make it follow a three-dimensional curved surface.
  • the heat-curable magnetic adhesive composition according to the present embodiment is used to join two or more members (adhered members) at least one of which is a ferromagnetic material.
  • a member made of a material exhibiting ferromagnetism a member made of a material containing iron, cobalt, nickel or the like can be mentioned.
  • the heat-curable magnetic adhesive composition according to the present embodiment is suitably used for a part that is at a high temperature, because the heat resistance after curing is high.
  • automotive parts such as automobile door and body steel plates, hole sealing plates of steel plates, reinforcing parts of car bodies, particularly in the vicinity of heat generating parts such as engines and exhaust pipes; in structures such as buildings It is suitably used for steel parts; metal parts for precision instruments, electronic instruments, etc., particularly in the vicinity of heat-generating parts in those instruments.
  • the heat-curable magnetic adhesive composition according to the present embodiment can be formed into a predetermined shape required to join the members as described above.
  • the shape include various shapes such as triangles, quadrilaterals, polygons such as pentagons, hexagons and octagons, circles such as circles and ovals, and ring-like shapes from which the central part of these shapes is removed.
  • sheet-like bodies of a shape corresponding to the heat-curable magnetic adhesive sheet of the present invention
  • plate-like bodies block-like bodies, columnar bodies, rod-like bodies and the like.
  • the acrylic polymer (A) of the heat-curable magnetic adhesive composition according to the present embodiment has a functional group that reacts with the cross-linking agent (hardening agent (C)), the heat-curable type When the magnetic adhesive composition is thermoformed, the acrylic polymer (A) is crosslinked.
  • the heating temperature at this time is preferably 20 to 120 ° C., particularly preferably 40 to 80 ° C.
  • the heating temperature when bonding the adherend with the heat-curable magnetic adhesive composition according to the present embodiment is preferably 70 to 250 ° C., particularly preferably 130 to 200 ° C. By heating at such a temperature, the heat-curable magnetic adhesive composition according to the present embodiment is cured to exhibit high adhesive strength, thereby firmly bonding the adherend.
  • the heat-curable magnetic adhesive sheet according to the present embodiment is a sheet of the heat-curable magnetic adhesive composition.
  • the thickness of the heat-curable magnetic adhesive sheet is preferably 0.1 to 5 mm, particularly 0.2 to 3 mm, and more preferably 0. It is preferably 3 to 2 mm.
  • the method for producing the heat-curable magnetic adhesive sheet according to the present embodiment is not particularly limited, but can be preferably produced by hot pressing the heat-curable magnetic adhesive composition.
  • the temperature of the hot press is preferably 20 to 120 ° C., particularly preferably 40 to 80 ° C.
  • the acrylic polymer (A) of the heat-curable magnetic adhesive composition according to the present embodiment has a functional group that reacts with the crosslinking agent (curing agent (C))
  • the above-mentioned hot is crosslinked by pressing.
  • the release sheet is laminated on both sides of the heat-curable magnetic adhesive sheet obtained when hot pressing as described above, the heat-curable magnetic adhesive composition is sandwiched between two release sheets. It is preferable to do.
  • the release sheet may be a release sheet subjected to double-sided release treatment, or may be a release sheet subjected to single-side release treatment. The release sheet is used such that the release treated surface is on the side of the heat-curable magnetic adhesive sheet.
  • the above-mentioned release sheet is, for example, a polyester resin film such as polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate resin, a plastic film such as polyolefin resin film such as polypropylene resin or polyethylene resin, glassine paper, coated paper, What apply
  • coats release agents, such as a silicone resin, etc. is used for the lamination paper etc. which laminated thermoplastic resins, such as polyethylene, on paper base materials, such as a high quality paper.
  • the thickness of the release sheet is not particularly limited, but is preferably 20 to 200 ⁇ m in general.
  • the heat-curable magnetic adhesive sheet according to the present embodiment has high adhesion after heat-hardening, and does not soften / melt even after reheating, so it is excellent in heat resistance. Furthermore, by not melting after heat curing, the thickness change due to the magnetic lines of force does not occur.
  • the shear force after heat bonding of the heat-curable magnetic adhesive sheet according to the present embodiment is preferably 80 N / cm 2 or more, particularly preferably 120 N / cm 2 or more, and further preferably 200 N / cm. It is preferable that it is two or more.
  • one surface of the heat-curable magnetic adhesive sheet is attached to a stainless steel plate (0.5 mm in thickness), and the other surface is another stainless steel plate. After sticking to (thickness 0.5 mm) and heating at 150 ° C. for 40 minutes, it is returned to normal temperature and refers to a shear force measured according to JIS K 6850 (testing speed 50 mm / min).
  • the heat-curable magnetic adhesive sheet according to the present embodiment can achieve high shear force as described above when the heat-curable magnetic adhesive composition contains the epoxy resin (B). . According to the heat-curable magnetic adhesive sheet having such a shearing force, it is possible to effectively suppress that the adhered members are shifted with time or the like.
  • the heat-curable magnetic adhesive sheet according to the present embodiment preferably has a surface magnetic force of 1 mT or more at normal temperature, particularly preferably 3 to 100 mT, and more preferably 5 to 50 mT.
  • the surface magnetic force in the present specification refers to the surface magnetic force measured by a gauss meter at a distance of 1 cm from the surface of the heat-curable magnetic adhesive sheet having a thickness of 1 mm. If the surface magnetic force is 1 mT or more, temporary fixing can be performed sufficiently on a member made of a ferromagnetic material. Further, if the surface magnetic force is 100 mT or less, repositioning can be easily performed even if the temporarily fixed position is deviated from the predetermined position.
  • the heat-curable magnetic adhesive sheet according to this embodiment preferably has a bending resistance of 10 to 2,000 mN, particularly preferably 50 to 1,500 mN, and further preferably 100 to 800 mN.
  • the bending resistance in the present specification refers to JIS L 1096 (1999) 8.20., Using a bending resistance tester, for a heat-curable magnetic adhesive sheet having a length of 38 mm and a width of 25 mm. It refers to the bending resistance measured according to the Gurley method of 1.
  • the heat-curable magnetic adhesive composition contains the acrylic rubber as the acrylic polymer (A) to obtain the above-mentioned hardness and hardness. Can be achieved.
  • the heat-curable magnetic adhesive sheet having such a bending resistance exhibits excellent flexibility, and even if the adherend has a three-dimensional curved surface, it adheres to the adherend and adheres reliably. can do.
  • the heat-curable magnetic adhesive sheet according to the present embodiment can also be used for the same application as the above-described heat-curable magnetic adhesive composition.
  • the method for producing a joined body according to the present embodiment is a method for producing a joined body by joining two or more adherends of which at least one is made of a ferromagnetic material. First, two or more adherends are temporarily fixed using the above-mentioned heat-curable magnetic adhesive composition or heat-curable magnetic adhesive sheet, and then the above-mentioned heat-curable magnetic adhesive The composition or the heat-curable magnetic adhesive sheet is heated to bond the two or more adherends. More specifically, the following method is exemplified.
  • a method of bonding a first member made of a ferromagnetic material and a second member made of a ferromagnetic material, with the above-mentioned heat-curable magnetic adhesive sheet interposed between the bonding surfaces thereof Will be explained.
  • a heat-curable magnetically attachable adhesive sheet having the shape of the joint surface between the first member and the second member is prepared.
  • the heat-curable magnetic adhesive sheet is held between the joining surfaces of two members, and the first member and the second member are separated by the magnetic force (and adhesive force) of the heat-curable magnetic adhesive sheet. Temporarily fix. This improves the workability.
  • the heat-curable magnetic adhesive sheet is heated and then cooled to firmly bond the first member and the second member to obtain a joined body.
  • the shapes of the first member and the second member are not particularly limited.
  • a method of bonding a first member and a second member made of a ferromagnetic material with a heat-curable magnetic adhesive composition interposed therebetween on a bonding surface thereof will be described.
  • an adhesive portion made of a heat-curable magnetic adhesive composition is formed on a first member.
  • a heat-curable magnetic adhesive composition may be applied to the first member, or the first member with respect to the heat-curable magnetic adhesive composition. May be stacked.
  • the first member may or may not be ferromagnetic.
  • the adhesive portion formed on the first member is adsorbed to the second member by the magnetic force (and adhesive force) of the adhesive portion, and the first member and the second member are temporarily fixed. . This improves the workability. Then, the heat-curable magnetic adhesive composition is heated and then cooled to strongly bond the first member and the second member to obtain a joined body.
  • the adhesive in the joined body obtained as described above has high adhesion and shear force, and does not soften / melt even after reheating, so it is also excellent in heat resistance. Furthermore, since the adhesive does not melt, no thickness change occurs due to magnetic lines of force.
  • Example 1 As acrylic polymer (A), ethyl acrylate (EA), n-butyl (meth) acrylate (BA), and acrylic acid (AA) are copolymerized at a mass ratio of 37: 60: 3. An acrylic rubber having a mass average molecular weight of 1,300,000 and a molecular weight distribution of 2.70 was prepared.
  • release sheet two release sheets (made by Lintec Co., Ltd., product name “SP-PET 381130, thickness: 38 ⁇ m) were prepared in which one side of a polyethylene terephthalate film was release-treated with a silicone release agent.
  • the heat-curable magnetic adhesive composition obtained above is sandwiched between the two release sheets, and the release-treated surface of the release sheet is in contact with the heat-curable magnetic adhesive composition.
  • Examples 2-28, Comparative Examples 1-2 The same procedure as in Example 1 was carried out except that the types and blending amounts of the components constituting the heat-curable magnetic adhesive composition and the thickness of the heat-curable magnetic adhesive sheet were changed as shown in Table 1. A heat-curable magnetic adhesive sheet was produced.
  • two types of epoxy resins (B) epoxy resin (B) -1 and epoxy resin (B) -2) were used.
  • Test Example 2 (Surface Magnetic Force Measurement) A gauss meter (Toyo Technica Co., Ltd.) at a distance of 1 cm from the surface of the heat-curable magnetic adhesive sheet obtained by peeling one release sheet from the heat-curable magnetic adhesive sheet obtained in Examples and Comparative Examples. The surface magnetic force (mT) at room temperature was measured by a product name “5080 Handy Gauss Meter”. The results are shown in Table 1.
  • the heat-curable magnetic adhesive sheet obtained in the examples had a good surface magnetic force and exhibited high shear force after heat-hardening.
  • the heat-curable magnetic adhesive sheet obtained in Examples 1 to 23 and 25 to 28 had a low bending resistance and was excellent in flexibility.
  • the present invention can be suitably used to bond a member and a member made of a ferromagnetic material, or to bond members made of a ferromagnetic material to each other.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

　La présente invention concerne une composition adhésive magnétisable du type durcissement thermique contenant un polymère acrylique (A), une résine époxy (B), un agent de durcissement (C), et un corps ferromagnétique (D). La résine époxy (B) comprend au moins un type choisi dans le groupe constitué par les résines époxy de type crésol-novolaque, les résines époxy de type phénol-novolaque et les résines époxy de type bisphénol-novolaque. À l'étape initiale, cette composition adhésive magnétisable du type durcissement thermique présente un pouvoir de fixation temporaire dû à l'attraction magnétique, et après avoir été durcie par voie thermique, elle présente une force de cisaillement élevée ainsi qu'une exceptionnelle résistance à la chaleur.
PCT/JP2014/075187 2013-09-27 2014-09-24 Composition adhésive magnétisable du type durcissement thermique et feuille adhésive WO2015046199A1 (fr)

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JP2015539232A JPWO2015046199A1 (ja) 2013-09-27 2014-09-24 加熱硬化型磁着性接着剤組成物および接着シート
KR1020167010475A KR20160063354A (ko) 2013-09-27 2014-09-24 가열 경화형 자착성 접착제 조성물 및 접착 시트
CN201480052657.0A CN105579544B (zh) 2013-09-27 2014-09-24 加热固化型磁化性粘接剂组合物及粘接片

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KR20160130438A (ko) * 2014-03-07 2016-11-11 린텍 가부시키가이샤 가열 경화형 접착제 조성물 및 가열 경화형 접착 시트
JP6721325B2 (ja) * 2015-12-14 2020-07-15 デクセリアルズ株式会社 熱硬化性接着シート、及び半導体装置の製造方法
CN107994063B (zh) * 2017-12-15 2020-04-28 武汉华星光电半导体显示技术有限公司 磁性胶材、磁性胶膜、贴合方法及amoled显示装置
CN108652150A (zh) * 2018-06-19 2018-10-16 深圳市缤纷珠宝开发有限公司 可磁力接合的中空结构的首饰及其制备方法、首饰产品
KR102631738B1 (ko) * 2018-12-17 2024-02-01 닛폰세이테츠 가부시키가이샤 적층 코어, 적층 코어의 제조 방법 및 회전 전기 기기
CN110819258A (zh) * 2019-11-05 2020-02-21 新纶科技（常州）有限公司 压敏胶粘剂聚合物及其制备方法、压敏胶粘剂制品及其制备方法
CN115179205A (zh) * 2022-06-30 2022-10-14 安徽吉曜玻璃微纤有限公司 一种无甲醛树脂粘结剂及其制备方法

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JPS60118774A (ja) * 1983-12-01 1985-06-26 Bridgestone Corp 磁性粘着剤
JPS61258880A (ja) * 1985-05-10 1986-11-17 Toyo Tire & Rubber Co Ltd 磁性を有する熱硬化性樹脂接着剤及び接着方法
JPS63312379A (ja) * 1987-06-15 1988-12-20 Sekisui Chem Co Ltd 熱硬化型感圧性接着剤組成物
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TWI624523B (zh) 2018-05-21
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JPWO2015046199A1 (ja) 2017-03-09
TW201516111A (zh) 2015-05-01
KR20160063354A (ko) 2016-06-03

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