WO2004081071A1 - 導電性樹脂組成物、その製造方法及び燃料電池用セパレータ - Google Patents
導電性樹脂組成物、その製造方法及び燃料電池用セパレータ Download PDFInfo
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- WO2004081071A1 WO2004081071A1 PCT/JP2004/002843 JP2004002843W WO2004081071A1 WO 2004081071 A1 WO2004081071 A1 WO 2004081071A1 JP 2004002843 W JP2004002843 W JP 2004002843W WO 2004081071 A1 WO2004081071 A1 WO 2004081071A1
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- acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/067—Polyurethanes; Polyureas
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
- C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
- C08F299/06—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polyurethanes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0221—Organic resins; Organic polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
- H01M8/0226—Composites in the form of mixtures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a conductive resin composition useful as various electric / electronic members, industrial members, and battery members such as fuel cell separators, a method for producing the same, and a fuel obtained by molding the conductive resin composition.
- the present invention relates to a battery separator.
- a molded article of the conductive resin composition is expected as a material to replace a conventional metal processed article and the like.
- Materials in the electric field include, for example, separator materials for fuel cells and the like, and highly conductive resin compositions used for various battery members.
- fuel cells There are various types of fuel cells, depending on the type of electrolyte, fuel, and oxidant used as part of the configuration, among which solid polymer electrolyte membranes are used as the electrolyte, hydrogen gas is used as the fuel, and air is used as the oxidant.
- solid polymer electrolyte membranes are used as the electrolyte
- hydrogen gas is used as the fuel
- air is used as the oxidant.
- polymer electrolyte fuel cells and methanol direct fuel cells that directly extract hydrogen from methanol inside the fuel cell and use it as fuel. These fuel cells are capable of efficient power generation at a relatively low operating temperature of 200 ° C or less during power generation.
- the separator which is one of the components of these fuel cells, has gas impermeability to stably supply the fuel and oxidant gas to the electrodes in a separated state, and conductivity to increase power generation efficiency. And durability such as corrosion resistance and hydrolysis resistance in the operating environment. In addition, when manufacturing separators, it is necessary to have excellent productivity and good moldability.
- thermosetting resin for example, use of an epoxy resin, a phenol resin, a radial polymerizable resin, or the like has been proposed.
- Japanese Patent Application Laid-Open No. 2001-153183 proposes a curable composition containing, for example, a bulester resin and a carbon-based filler.
- Japanese Patent Application Laid-Open No. 2002-164630 proposes a resin composition containing a radical polymerizable resin such as a vinyl ester resin and a carbon-based filler.
- the epoxy (meth) acrylate which is a vinyl ester resin used in the technology disclosed in the literature generally has a large number of hydroxyl groups in a molecule. Rate is high, and strength decreases with water absorption. Further, the water that has penetrated causes hydrolysis of the resin to proceed, and the strength of the molded article is further reduced. Therefore, there is a practical problem in using such an epoxy (meth) acrylate for a fuel cell separator.
- the above-mentioned Japanese Patent Application Laid-Open No. 2002-164630 discloses a method for thickening the above-mentioned vinyl ester resin at the time of molding, by adding an anhydrous polyvalent to a hydroxy group generated by a reaction between an epoxy group and a carboxyl group.
- a method is disclosed in which carboxylic acid is added to form a carboxyl group, and a metal oxide such as magnesium or potassium is used as a thickener to thicken the mixture.
- a metal oxide such as magnesium or potassium
- US Pat. No. 6,251,308 proposes a curable resin composition containing a carbon-based filler such as a bullet ester resin and a polyisocyanate.
- This resin composition has good mechanical strength and conductivity of the obtained separator, and also has improved durability such as hydrolysis resistance to a certain extent.
- the mechanical strength of the molded article may be reduced due to water absorption and hydrolysis of the resin, and there is still room for improvement in durability, especially in resistance to water decomposition.
- control of the moldability of the resin composition is not always easy, and it is desirable to obtain a molded article having a complicated shape such as a fuel cell separator by a compression molding method, which is a molding technique disclosed in the literature.
- An object of the present invention is to provide a fuel cell separator that is excellent in dimensional accuracy, conductivity, heat resistance, mechanical strength, and especially durability such as resistance to hydrolytic decomposition. Another object of the present invention is that there is no problem with the moldability such as separation of the resin component and the conductive filler during molding, generation of voids and warpage, and excellent resin filling properties in the molding die. An object of the present invention is to provide a conductive resin composition capable of obtaining various electric and electronic members, such as a fuel cell separator having excellent characteristics.
- Still another object of the present invention is to provide a method for producing the conductive resin composition.
- the inventors of the present invention have conducted intensive studies to solve the above-mentioned problems.
- polyisocyanate is reacted with a hydroxyl group of epoxy (meth) acrylate, and the epoxy (meth) acrylate is urethane-modified.
- the decrease in mechanical strength due to water absorption and hydrolysis is greatly improved, and a molding obtained from a resin composition containing the urethane-modified epoxy (meth) acrylate and a conductive filler as main components is obtained. It has been found that the durability of the product can be improved.
- Epoxy (meth) acrylate is also referred to as bulester resin in the industry, and both are often treated as synonyms.
- the polyisocyanate is reacted with the hydroxyl group of the epoxy (meth) acrylate to urethane-modify the epoxy (meth) acrylate, thereby improving the durability and increasing the viscosity of the resin composition. Further, it was confirmed that the fluidity was not obtained at room temperature, and that an effect of avoiding the occurrence of the problem at the time of molding and securing good moldability was also obtained.
- the resin composition when the resin composition is thickened to such an extent that separation of the resin component from the conductive material 14 and generation of voids can be suppressed, the resin can be sufficiently reduced to a narrow portion having a complicated shape of a molding die. Another formability problem was encountered in that the composition was not filled, or the resulting molded article was warped, resulting in some trouble.
- a (meth) ataryl acid is added to an epoxy resin having an aromatic cyclic structural unit and a Z or aliphatic cyclic structural unit by an addition reaction.
- Epoxy (meth) acrylate is used, but the viscosity of epoxy (meth) acrylate is high, so that it can be used to improve the handleability of the resin composition when it is blended, and it can be used as a conductive filler.
- a relatively low molecular weight compound having radical polymerizability such as (meth) acrylate / styrene is used as a diluent.
- the aromatic cyclic structural unit and the (Meta) acrylate having a number average molecular weight of 500 to 10,000 with no active hydrogen atom, to separate the resin component from the conductive filler and to form a void. While suppressing the occurrence of, it is possible to solve the problem of filling of the resin composition into the molding die and warping during molding, and furthermore, dimensional accuracy, conductivity, heat resistance, mechanical strength, and especially The present invention has been completed by finding that a molded article having excellent durability such as hydrolysis resistance can be obtained.
- the present invention relates to an epoxy (meth) obtained by adding (meth) acrylic acid to a conductive filler (A) and an epoxy resin having an aromatic cyclic structural unit and / or an aliphatic cyclic structural unit.
- Urethane-modified epoxy (meth) atalylate (B) obtained by reacting acrylate (b-1) with polyisocyanate (b-2); and aromatic cyclic structural unit and Z or aliphatic ring A (meth) acrylate (C) having 20 to 80% by weight of a structural unit and having no active hydrogen atom and having a number average molecular weight of 500 to 10,000; and the urethane-modified epoxy (meth).
- It is intended to provide a conductive resin composition comprising atalylate (B) and the above (meth) atalylate (C) and another ethylenically unsaturated monomer (D) copolymerizable therewith. .
- the present invention provides (1) an epoxy obtained by adding (meth) acrylic acid to a conductive filler (A) and an epoxy resin having an aromatic cyclic structural unit and Z or an aliphatic cyclic structural unit.
- a method for producing a conductive resin composition comprising: a second step.
- the present invention provides a fuel cell separator obtained by molding the conductive resin composition.
- (meth) acrylate refers to acrylate and methacrylate
- (meth) acrylic acid refers to acrylic acid and methacrylic acid. I do.
- the conductive filler (A) used in the present invention is not particularly limited, and examples thereof include a carbon material, a metal, a metal compound, and a conductive polymer powder. Among these, a carbon material is preferable in terms of durability.
- Examples of the carbon material include artificial graphite, natural graphite, glassy carbon, carbon black, acetylene black, Ketjen black, and expanded graphite obtained by chemically treating graphite.
- artificial graphite, natural graphite, and expanded graphite are preferable because high conductivity can be achieved with a small amount.
- the shape of these carbon materials may be any of fibrous, particulate, foil, scaly, needle, spherical, and amorphous.
- examples of the fibrous carbon material include pitch-based, PAN-based, and rayon-based carbon fibers depending on the type of the raw material fiber.
- carbon fibers produced through a carbonization and graphitization step at a high temperature of 2,000 ° C. or more are preferable in consideration of conductivity.
- the length and form of the carbon fiber are not particularly limited, but those having a fiber length of 25 mm or less are preferable in view of the kneading property with the resin. Examples of carbon fibers of this length include filaments, chopped strands, and milled fiber.
- metal and the metal compound examples include aluminum, zinc, iron, copper, nickel, silver, gold, stainless steel, palladium, titanium, boride thereof, zirconium boride, and hafem boride. Can be mentioned.
- the shape of the metal and the metal compound may be any of a particle shape, a fiber shape, a foil shape, and an amorphous shape.
- the conductive filler can be used alone or in combination of two or more. Further, as long as the effects of the present invention are not impaired, a non-conductive material can be used in combination with the above-described conductive material, or a composite material of the conductive material and the non-conductive material can be used. .
- Examples of such a composite material of a conductive material and a non-conductive material include metal-coated glass fiber, metal-coated glass beads, and metal-coated inorganic filler. You.
- the amount of the conductive filler (A) used is preferably 50% by weight or more, more preferably 60 to 90% by weight, based on the total amount of the conductive resin composition of the present invention.
- the amount of the conductive filler (A) is within the above range, the resulting conductive resin composition has good flowability, excellent moldability, and excellent conductivity required for separators of fuel cells and the like. Can be achieved.
- the urethane-modified epoxy (meth) atalylate (B) used in the present invention is obtained by a ring-opening addition reaction of (meth) acrylic acid with an epoxy resin having an aromatic cyclic structure and a Z or aliphatic cyclic structure. It is obtained by reacting polyisocyanate (b-2) with epoxy (meth) acrylate (b-1).
- Such an epoxy (meth) atalylate (b-1) has a hydroxyl group based on a ring-opening addition reaction in a molecule and a functional group such as a (meth) atalyloyl group at a terminal.
- the epoxy (meth) acrylate (b-1) preferably has a number average molecular weight of 500 to 10,000, particularly preferably 500 to 5,000. When it is in the range of 500 to 10,000, strength, water resistance and handleability are good.
- the hydroxyl value of the epoxy (meth) acrylate (b-1) is preferably from 100 to 300, particularly preferably from 120 to 230. By adjusting the hydroxyl value to 100 to 300, a viscosity suitable for molding is obtained from the chain elongation reaction with the polyisocyanate (b-2), and a high-quality molded product with few defects such as voids is obtained. It becomes possible.
- a method of controlling the hydroxyl value of the epoxy (meth) acrylate (b-1) to 100 to 300 a method of reacting two or more epoxy resins having different epoxy equivalents with (meth) acrylic acid is preferable.
- a method of reacting (meth) acrylic acid with an epoxy resin having an epoxy equivalent is exemplified.
- Another method is to add an isocyanate compound having reactivity with a hydroxyl group in the epoxy (meth) acrylate (b-1) after the ring-opening addition reaction to lower the hydroxyl value.
- Examples of the epoxy resin having an aromatic cyclic structure and a Z or aliphatic cyclic structure which can be used as a raw material of the epoxy (meth) acrylate (b-1) include, for example, bisphenol Glycidyl ethers of polynuclear phenols such as phenol A-type epoxy resin, biphenol type epoxy resin, phenol novolak type epoxy resin, cresol nopolak type epoxy resin, brominated epoxy resin, and diglycidyl ether of alkylene oxide adduct of bisphenol A Glycidyl ethers of polyols such as diglycidyl ether of hydrogenated bisphenol A, glycidyl esters such as diglycidyl hexahydrophthalate, glycidylamines such as tetradaricidyl diaminodiphenylmethane, bisphenol fluorene Examples include epoxy resins and biscresol fluorene epoxy resins. These epoxy resins may be used alone or in combination of two or
- a nopolak epoxy resin in terms of heat resistance and water resistance.
- a pentagen-based novolak-type epoxy resin having a disc mouth and a biphenyl-based novolak-type epoxy resin are particularly preferable.
- dicyclopentadiene-based nopolak-type epoxy resin examples include a resin obtained by reacting dicyclopentane with phenols in the presence of an acidic catalyst, and stirring and mixing the product with activated clay in an organic solvent (Japanese Patent Laid-Open No. — See No. 2 52 3 4 9).
- biphenyl-based nopolak-type epoxy resin for example, a resin obtained by glycidyl etherification of a phenolic / reactive hydroxyl group of 4,4′-biphenyldimethylmethylene-phenol resin (Japanese Patent Application Laid-Open No. 2001-644) See Japanese Patent Publication No. 340/340).
- the epoxy resin preferably has an aromatic cyclic structural unit and a ⁇ or aliphatic cyclic structural unit in the molecule in an amount of 30 to 90% by weight, more preferably 50 to 80% by weight. is there.
- an aromatic cyclic structural unit and / or an aliphatic cyclic structural unit in the range of 30 to 90% by weight the resulting conductive resin composition has low water absorption and high hardness.
- a molded article having high durability can be obtained.
- Examples of the polyisocyanate (b-2) that can be used as a raw material of the urethane-modified epoxy (meth) acrylate (1) include 1,6-hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, 4, one zip G, tolylene diisocyanate, xylylene diisocyanate, And 4,4, dicyclohexynolemethane diisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate, norbornene diisocyanate and the like.
- isocyanurate compounds obtained by converting various isocyanate compounds into isocyanurate are also included. These may be used alone or in combination of two or more.
- the amount of the polyisocyanate (b-2) used is such that the number of moles of hydroxyl groups in the epoxy (meth) acrylate (b-1) is based on the number of moles of isocyanate groups in the polyisocyanate (b-2). Is preferably in the range of 1.0 / (0.5 to: I.5) with respect to the molar ratio (mol number of hydroxyl group Z molar number of isocyanate group), and 1.0 / (0.8 to 1.2). ) Is more preferable. By controlling the amount of the polyisocyanate (b-2) used in such a range, the moldability of the obtained conductive resin composition, the physical properties of the molded article, and the like can be controlled.
- Examples of a method of causing an addition reaction between the epoxy (meth) acrylate (b-1) and the polyisocyanate (b-2) include a method of mixing and reacting both components using a kneader or the like. .
- the number-average molecular weight of the urethane-modified epoxy (meth) atalylate (B) used in the present invention is preferably in the range of 50,000 to 100,000, and particularly preferably 10,000 to 200,000. By having the number average molecular weight in such a range, good moldability is exhibited.
- acrylate (C) having 20 to 80% by weight of an aromatic cyclic structural unit and / or an aliphatic cyclic structural unit used in the present invention, having no active hydrogen atom, and having a number average molecular weight of 500 to 100,000
- acrylate (C) for example, a (meth) acrylate or an aromatic obtained by reacting a polyol having an aromatic cyclic structural unit and / or an aliphatic cyclic structural unit with (meth) acrylic acid can be used.
- Use urethane (meth) phthalate obtained by reacting a polyisocyanate having a cyclic structural unit and a Z or aliphatic cyclic structural unit with a (meth) atalylate having a hydroxyl group and, if necessary, a polyol. can do.
- polyol having an aromatic cyclic structural unit and / or an aliphatic cyclic structural unit which can be used as a raw material of the (meth) acrylate are, for example, aromatic Examples thereof include a polyester polyol, a polyether polyol, and a polycarbonate polyol each having a cyclic structural unit and a no or aliphatic cyclic structural unit, and each of them can be used alone or in combination of two or more.
- polyether polyols are preferred from the viewpoints of hydrolysis resistance and mechanical strength of the obtained molded article, and among them, a polynuclear phenol compound and a cyclic compound such as an alkylene oxide are exemplified in the presence of a catalyst.
- a cyclic compound adduct of a polynuclear phenolic compound obtained by reacting below is more preferable, and an alkylene oxide adduct of a polynuclear phenolic compound is particularly preferable.
- alkylene oxide adducts of the polynuclear phenol compound an alkylene oxide adduct of a bisphenol compound and an alkylene oxide adduct of a phenol nopolak compound are more preferable.
- the number of moles of these alkylene hydroxide adducts is preferably 3 moles or less on average for alkylenoxide to 1 mole of phenolic hydroxyl group.
- cyclic compound examples include cyclic ether compounds such as ethylene oxide, propylene oxide, butylenoxide, methoxetane, and tetrahydrofuran, and other cyclic carbonate compounds such as ethylene carbonate and propylene carbonate. Can be used.
- polynuclear phenolic compound examples include bisphenol A, bisphenol S, bisphenol A, bisphenol A, bisphenol A, bisphenol A, tetramethinoles bisphenol A, gallolinolebisphenol A, 4-, 4-year-old xybis.
- Bisphenol compounds such as phenol, biphenol, tetramethylbiphenol, bisphenolfluorene, biscrezonolefluorene, terpenediphenol, phenol monophenol, cresol novolak, xylylene phenol, bisphenol A novalac, triphenylmethane Nopolak such as Nopolak, Bihue-Norenopolak, disc-opened pentagenphenol phenol novolak, and Tenoropenpheno-Norenopolak, etc., which can be appropriately selected and used. .
- Examples of the (meth) acrylate containing a hydroxyl group which is one of the raw materials of the urethane (meth) acrylate usable as the (meth) acrylate (C), include, for example, hydroxyxetyl (meth) acrylate, Roxypropyl (meta) Crylate, glycerin di (meth) acrylate, pentaerythritol tri (meth) acrylate, and the like can be used. These can be used alone or in combination of two or more.
- the polyisocyanate having an aromatic cyclic structural unit and / or an aliphatic cyclic structural unit used as a raw material of the urethane (meth) acrylate may be a polyurethane-modified epoxy (meth) acrylate (B). )),
- the polyisocyanate having an aromatic cyclic structural unit and / or an aliphatic cyclic structural unit can be used among the polyisocyanates (b-2) used as the raw material.
- the aromatic cyclic structural unit and / or the aliphatic polyisocyanate having the aromatic cyclic structural unit and the Z or aliphatic cyclic structural unit and the aromatic cyclic structural unit exemplified as the raw material of the (meth) acrylate may be used.
- the urethane '(meth) acrylate can also be obtained by reacting with the (meth) acrylate.
- the (meth) acrylate (C) constituting the present invention is a urethane modified product obtained by reacting an epoxy (meth) acrylate (b-1) with a polyisocyanate (b-2) to extend the chain.
- Epoxy (meth) acrylates (B) are given plasticity 14 to the molding die while suppressing separation of the resin component constituting the conductive resin composition of the present invention from the conductive filler and generation of voids. This has the effect of improving the filling properties of the resin composition and reducing the warpage of the molded article.
- the (meth) acrylate (C) used in the present invention does not have an active hydrogen atom, but as long as plasticity can be imparted to the urethane-modified epoxy (meth) acrylate (B), for example, A (meth) acrylate having a hydroxyl value of 40 or less can be used in combination.
- “having no active hydrogen atom” means that it does not have a functional group having an active hydrogen atom such as a hydroxyl group, an amino group, a carboxyl group, and a mercapto group.
- the number average molecular weight of the (meth) acrylate (C) is as follows.
- 500 to 1 in terms of the balance between the viscosity of the (meth) atarylate (B) and the plasticizing effect It is preferably 0,000, more preferably 500 to 5,000.
- the (meth) atalylate (C) used in the present invention has 20 to 80% by weight of the aromatic cyclic structural unit and / or the aliphatic cyclic structural unit derived from the above-mentioned polyol. There, preferably having 3 0-6 0 weight 0/0.
- (meth) acrylate (C) containing the aromatic cyclic structural unit and / or the aliphatic cyclic structural unit in such a range can exhibit low water absorption, high hardness, and high durability performance. .
- the epoxy (E) Any monomer can be used without particular limitation as long as it is a monomer copolymerizable with (meth) acrylate (B) or the like.
- Such an ethylenically unsaturated monomer (D) has a number average molecular weight of less than 500 other than the urethane-modified epoxy.
- the urethane-modified 14 epoxy (meth) acrylate (B) and (meth) acrylate (C) are diluted to form a conductive resin composition. It can improve the handling ability and improve the water resistance of molded products.
- Examples of the ethylenically unsaturated monomer (D) include an aromatic vinyl monomer, (meth) acrylate, diaryl phthalate ester, carboxylic acid vinyl ester, vinyl ether, and a maleimide compound. Among them, aromatic butyl monomers are preferable for obtaining a fuel cell separator which is required to have low water absorption and high heat resistance.
- aromatic vinyl monomer examples include styrene, t-butyl styrene, vinylinolephthalene, vinylinolebiphenyl, pentaphenylenostyrene, vinylinolevirene, bierthiophene, and bulcarpazole.
- dibutyl monomers such as divinylbenzene, divinylnaphthalene and divinylbiphenyl should be used in combination with these aromatic vinyl monomers. Is preferred.
- other monomers can be used in combination as long as the moldability, water absorption, heat resistance, and the like are not reduced.
- ( ⁇ ) / (C) is in the above range, the moldability of the conductive resin composition of the present invention is appropriate, and a cured product or molded article having high performance such as mechanical strength and heat resistance can be obtained. .
- the mixing ratio of the urethane-modified epoxy (meth) acrylate ( ⁇ ), the (meth) acrylate (C) and the ethylenically unsaturated monomer (D) used in the present invention is determined by molding the molding material.
- the content of the conductive filler ( ⁇ ) is 50 to 90% by weight, and the content of the urethane-modified epoxy (meth) acrylate () is The content is 6 to 18% by weight, the content of the (meth) acrylate (C) is 2 to 8% by weight, and the content of the other ethylenically unsaturated monomer (D) is 2 to 25%. % By weight.
- the conductive resin composition of the present invention may further include, if necessary, a low-shrinking agent, a radical polymerization initiator, a polymerization inhibitor, an internal mold release agent, a compatibilizer, other fillers, a coloring agent, and the like. Can be.
- the low shrinkage agent examples include a thermoplastic resin.
- thermoplastic resins include polystyrene resins such as polystyrene, copolymers of styrene and (meth) acrylic acid ester, styrene-conjugated genblock copolymers, styrene-hydrogenated conjugated genblock copolymers, and the like. Styrene-free (meth) acrylate polymers such as poly (methyl methacrylate), poly (acrylic acid ⁇ -butyl ester), etc. Is mentioned.
- polystyrene resins and polyphenylene ether resins are preferred in terms of water resistance.
- thermoplastic resin to which a rubber-based resin is added can be used.
- the rubber-based resin include acrylonitrile-butane-based resin, cross-linkable rubber fine particles, and the like.
- thermoplastic resins can be used alone or in combination of two or more.
- the amount of the thermoplastic resin used is preferably 0.1 to 5% by weight from the viewpoint of the effect of reducing the shrinkage.
- a radical polymerization initiator is added to the conductive resin composition.
- a radical polymerization initiator include a thermal polymerization initiator, an ultraviolet polymerization initiator, and an electron beam polymerization initiator.
- the amount of the radical polymerization initiator to be used is preferably 0.1 to 10 parts by weight, particularly preferably 1 to 5 parts by weight, based on 100 parts by weight of the resin composition.
- thermal polymerization initiator examples include organic peroxides such as disilver oxide-based, peroxyester-based, hydroperoxide-based, ketone peroxide-based, alkyl perester-based and percarbonate-based compounds, Among these, preferable ones are appropriately selected according to the molding conditions.
- Examples of the ultraviolet polymerization initiator include photosensitizers such as an acylphosphinoxide type, a benzoin ether type, a benzophenone type, an acetophenone type, and a thioxanthone type compound. These can be appropriately selected and used according to the molding conditions.
- Examples of the electron beam polymerization initiator include halogenated alkylbenzenes and disulphide compounds.
- a radical polymerization accelerator that is, a curing accelerator can be used in combination with the radical polymerization initiator to promote curing.
- curing accelerators include metal salts such as cobalt naphthenate and cobalt otatenate, and tertiary amines such as N, N-dimethylaniline, N, N-di (hydroxyethyl) paratoluidine and dimethylacetoacetamide. It can be appropriately selected and used as needed.
- polymerization inhibitor a conventionally known polymerization inhibitor can be used. Specific examples include: hydridoquinone, p-t-butynole, t-butyl-noidroquinone, toluhydroquinone, p-benzoquinone, naphthoquinone, and hydroquinone monomer. Examples include tyl ether, phenothiazine, copper naphthenate, copper chloride and the like. One of these polymerization inhibitors may be used alone, or two or more thereof may be used by mixing them as appropriate.
- the internal release agent examples include a paraffinic compound such as carnapa wax, a higher fatty acid such as stearic acid, a higher fatty acid salt such as zinc stearate, or a fatty acid ester compound, an alkyl phosphate, a modified silicone oil, a modified silicone oil. Fluorine compounds and the like can be mentioned. These can be suitably selected and used according to molding conditions and various applications.
- the compatibilizing agent has the effect of preventing separation over time due to the addition of the above-described low-shrinking agent such as polystyrene to the conductive resin composition of the present invention, and finely dispersing the low-shrinking agent. Things.
- the compatibilizer various commercially available additives and compounds can be used.
- an inorganic filler and a powdered organic filler can be used.
- examples thereof include inorganic fillers such as glass powder, silica and silicon carbide, and organic fillers such as polytetrafluoroethylene powder and melamine resin powder. These fillers can be appropriately selected and used according to molding conditions and various applications.
- coloring agent various inorganic pigments, organic pigments, and the like can be used.
- inorganic pigments such as titanium white and carbon black
- organic pigments such as phthalocyanine blue, quinacridone red, and perylene.
- the conductive resin composition of the present invention is obtained by adding (meth) acrylic acid to (1) a conductive filler (A) and an epoxy resin having an aromatic cyclic structure and a Z or aliphatic cyclic structure. 20 to 80% by weight of an epoxy (meth) acrylate (b-1), a polyisocyanate (b-12), and an aromatic cyclic structural unit and / or an aliphatic cyclic structural unit. And kneading (meth) acrylate (C) having no active hydrogen atom and having a number average molecular weight of 500 to 100,000 and an ethylenically unsaturated monomer (D).
- the kneading in the first step can be performed using a mixing device such as a kneader, a stirrer, or a mixer.
- an epoxy (meth) atalylate (b-1) having the above-mentioned aromatic cyclic structure and / or aliphatic cyclic structure, an aromatic cyclic structural unit, and Z or an aliphatic ring (Meth) acrylate (C) having a number average molecular weight of 500 to 100, and having a structural unit of 20 to 80% by weight, having no active hydrogen atom, and ethylenic properties
- polyisocyanate (b-2) is added and mixed, and the kneader is charged in advance.
- Such kneading may be performed under normal pressure or under reduced pressure.
- the temperature during kneading is preferably from room temperature to 60 ° C.
- the kneaded material can be made into a sheet, block, or particle to improve the moldability and the handleability of the mixture.
- the epoxy (meth) acrylate (b-1) and the polyisocyanate (b-2) may have reacted to some extent by the kneading as long as they can be taken out of the mixing device.
- the conductive resin and the composition of the present invention are added to the epoxy (meth) acrylate (b-1) and the polyisocyanate (b-1) in a heated atmosphere at room temperature to 80 ° C. It is obtained by reacting b-2) at room temperature until it becomes a state having no fluidity, and elongating the chain.
- the time required for this reaction depends on the resin composition and temperature conditions, but is 5 to 10 times. It is about 0 hours.
- the conductive resin composition of the present invention has good moldability and handleability over a long period of time. This is due to the coexistence of moderately elongated urethane-modified epoxy (meth) acrylate (B) and controlled molecular weight (meth) acrylate.
- the conductive resin composition of the present invention can be molded by molding using a mold or the like by a molding method such as compression molding or injection molding.
- the molding temperature at this time is It is preferably about 100 to 200.
- the temperature is preferably adjusted to the optimum temperature range of the radical polymerization initiator.
- the molding pressure is adjusted to the optimal pressure according to the mold used, the shape of the molded product, and the application. The pressure in this case is generally about 5 to 2 OMPa. If necessary, post-curing can be performed in a heated atmosphere for the purpose of further accelerating or straightening after molding.
- the heat resistance of the molded article can be evaluated, for example, by measuring the heat distortion temperature by a method based on JIS-K-7207 (an edgewise method of ISO-75).
- Heat distortion temperature which the molded article has is a value determined by the load 1 8 1.
- 1 5 0 ° is desirably C or more, Der 2 0 0 ° C or higher Is particularly preferred.
- the heat resistance is sufficiently high because the possibility of thermal deformation after mounting is low.
- the molded article obtained as described above can be used for various electric and electronic members, industrial members, battery members such as fuel cell separators, and the like.
- the conductive resin composition of the present invention can accurately form grooves as gas flow paths by a known resin molding method without performing any processing such as cutting. Can be preferably used.
- the fuel cell separator of the present invention can be easily obtained by molding using a mold having a desired separator shape by a molding method such as compression molding, transfer molding, or injection molding.
- the molding temperature at this time can be appropriately selected, but in consideration of productivity, the temperature is usually preferably in the range of 140 to 190 ° C.
- the fuel cell separator of the present invention is preferably used for a fuel cell whose operating temperature during power generation is 200 ° C. or lower.
- the fuel cell separator of the present invention can be used as a fuel cell separator of various types such as a hydrazine type, a direct methanol type, an alkaline type, a solid polymer type, and a phosphate type. Among these, it is suitable for a polymer electrolyte fuel cell.
- the transfer of the conductive resin composition obtained in the following Examples and Comparative Examples was carried out using a transfer molding machine of 50 t at a pressure of 15 Ok gf / cm 2 (gauge pressure), a piston speed of lmm nos, and a temperature of 150. Molded. The cross section of the molded article was 7 ⁇ 2 mm. The spiral flow length of the cured product at that time was measured, and the results were classified into four stages.
- the fuel cell separators obtained in Examples and Comparative Examples described below were used as test pieces as they were, and the test pieces were visually observed for fillability, warpage, cracking, swelling, and internal state.
- the filling property was rated “good” when the material was uniformly filled to the end, and “bad” when the material was not filled and the thickness was uneven.
- the test piece with no occurrence was indicated as “none”, and the test piece with any occurrence was indicated as “with j”.
- Were visually observed, and those with a dense state were defined as “good”, and those with many voids were defined as “many voids”.
- the flat molded products obtained in the Examples and Comparative Examples were cut out to the specified size, used as test specimens, and immersed in hot water at 95 ° C adjusted to pH 1 acidity with sulfuric acid for 4000 hours. After that, the flexural strength was measured according to JIS K-6911. The retention ratio (%) with respect to the strength before immersion was calculated and evaluated in three steps. The atmosphere during the measurement was 25 ° C.
- epoxy methacrylate B-1 After cooling to around 80 ° C., it was taken out of the reaction vessel to obtain epoxy methacrylate. This is hereinafter referred to as epoxy methacrylate B-1.
- the hydroxyl value of this epoxy methacrylate B-1 was 166, and the aromatic cyclic structural unit was 39%.
- epoxy methacrylate B-2 After cooling to around 80 ° C., it was taken out of the reaction vessel to obtain epoxy methacrylate. This is hereinafter referred to as epoxy methacrylate B-2.
- the epoxy methacrylate B-2 had a hydroxyl value of 160 and an aromatic cyclic structural unit of 55%.
- epoxy methacrylate B-3 After cooling to around 80 ° C., it was taken out of the reaction vessel to obtain epoxy methacrylate. This is hereinafter referred to as epoxy methacrylate B-3.
- the hydroxyl value of this epoxy methacrylate B-3 was 153, and the aromatic cyclic structural unit was 51%.
- BAP-2 bisphenol A propylene lenoxide 2 mol adduct, hydroxyl equivalent 180, Nippon emulsifier
- 360 g, 444 g of holon diisocyanate was charged and reacted at 80 ° C. for 4 hours under a gas flow in which nitrogen and air were mixed in a ratio of 1: 1.
- 270 g of 2-hydroxyethyl methacrylate, 0.15 g of hydroquinone, and 0.1 g of tin octylate were added in 6 and the mixture was heated to 90 ° C. and reacted for 6 hours.
- urethane methacrylate was obtained.
- methacrylate C-1 This is hereinafter referred to as methacrylate C-1.
- the hydroxyl value of this metathallate C-1 was 4, and the number average molecular weight was 910. Furthermore, the aromatic cyclic structural unit in the molecule was 30%.
- Components other than the resins obtained in Synthesis Examples 1 to 4 above and used in Comparative Examples of Examples described below are listed below.
- K-1 100 Synthetic graphite, average particle size 300 ⁇ m, manufactured by Applied Carbon Technology: This is hereinafter referred to as filler A-1.
- Methacrylate of bisphenol A adduct of 2 mol of propylene lenoxide (manufactured by Nippon Emulsifier): This is hereinafter referred to as metathallate C-12.
- the methacrylate C-2 had a hydroxyl value of 8 and a number average molecular weight of 510.
- the aromatic cyclic structural unit in the molecule was 31%.
- Dick styrene CR-2500 polystyrene resin, molecular weight 200,000, manufactured by Dainippon Ink & Chemicals, Inc.
- This is hereinafter referred to as a low-shrinking agent-11.
- initiator-11 [organic peroxide, 10-hour half-life is 97 ° C, manufactured by Kayaku Axo]: This is hereinafter referred to as initiator-11.
- inhibitor-1 p-Venzoquinone (manufactured by Eastman Chemical): This is hereinafter referred to as inhibitor-1.
- Carnavalo II manufactured by Kato Yoko: This is hereinafter referred to as mold release agent-1.
- RS-900 contains a graft copolymer of polystyrene and polyethylene oxide, manufactured by Dainippon Ink and Chemicals, Inc.]: This is hereinafter referred to as Compatibilizer-11.
- Examples 1-5 Preparation of conductive resin composition and molded article
- the resin composition taken out of the multilayer film was uniformly filled in a separator mold for fuel cells and a flat plate mold, and a compression molding machine was used to apply a pressure of 14 O kgf / cm2 (gauge pressure). ), Upper die 150 ° C, lower die 144. C. Molding was performed under the conditions of a molding time of 10 minutes to produce a fuel cell separator having a width of 13 cm, a length of 20 cm and a thickness of 3 mm, and a flat molded product.
- Conductive resin compositions and molded articles were obtained in the same manner as in Examples 1 to 3, except that the urethane methacrylate and methacrylate used in Examples 1 to 3 were not used at all. In this case, the amount of the entire resin component was adjusted in order to make the amount of the conductive filler in the resin composition the same.
- the composition is shown in Table 1-2. Table 14 shows the evaluation results.
- a conductive resin composition and a molded article were obtained in the same manner as in Comparative Example 2, except that the conductive resin composition was prepared in Comparative Example 2 without using any polyisocyanate. In this case, in order to make the same amount of the conductive filler in the resin composition, was adjusted.
- the composition is shown in Table 1-2. Table 14 shows the evaluation results.
- the conductive resin composition of the present invention is excellent in handleability, and has no problems related to moldability such as separation of a resin component from a conductive filler during molding and generation of voids and warpage, and also has good moldability. It is possible to provide molded products that have excellent moldability and excellent dimensional accuracy.
- the molded product obtained by curing the conductive resin composition of the present invention has excellent durability such as conductivity, heat resistance, mechanical strength, and especially hydrolysis resistance. Therefore, the molded article obtained by curing the conductive resin composition of the present invention is extremely useful also as a fuel cell separator used in a severe environment.
- a fuel cell separator having the above-mentioned excellent characteristics can be economically and stably produced in a simple process.
- the fuel cell separator of the present invention it is possible to provide a fuel cell having high performance and high durability.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04717818A EP1602674B1 (en) | 2003-03-10 | 2004-03-05 | Conductive resin composition, process for production thereof, and fuel cell separators |
US10/532,084 US7858696B2 (en) | 2003-03-10 | 2004-03-05 | Conductive resin composition, process for production thereof, and fuel cell separators |
DE602004002096T DE602004002096T2 (de) | 2003-03-10 | 2004-03-05 | Leitfähige harzzusammensetzung, herstellungsverfahren dafür und brennstoffzellenseparatoren |
CA002503157A CA2503157A1 (en) | 2003-03-10 | 2004-03-05 | Conductive resin composition, process for producing the same and separator for a fuel cell |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-63192 | 2003-03-10 | ||
JP2003063192 | 2003-03-10 |
Publications (1)
Publication Number | Publication Date |
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WO2004081071A1 true WO2004081071A1 (ja) | 2004-09-23 |
Family
ID=32984423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/002843 WO2004081071A1 (ja) | 2003-03-10 | 2004-03-05 | 導電性樹脂組成物、その製造方法及び燃料電池用セパレータ |
Country Status (7)
Country | Link |
---|---|
US (1) | US7858696B2 (ja) |
EP (1) | EP1602674B1 (ja) |
KR (1) | KR100987683B1 (ja) |
CN (1) | CN100343297C (ja) |
CA (1) | CA2503157A1 (ja) |
DE (1) | DE602004002096T2 (ja) |
WO (1) | WO2004081071A1 (ja) |
Cited By (2)
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EP1760813A1 (en) * | 2005-08-31 | 2007-03-07 | Samsung SDI Co., Ltd. | Bipolar plate |
CN102070991A (zh) * | 2009-11-19 | 2011-05-25 | 古河电气工业株式会社 | 薄片状粘接剂及晶片加工用胶带 |
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TW200623492A (en) * | 2004-11-08 | 2006-07-01 | Tokai Carbon Kk | Separator material for solid polymer fuel cell and process for producing the same |
US7326369B2 (en) | 2005-03-07 | 2008-02-05 | National Starch And Chemical Investment Holding Corporation | Low stress conductive adhesive |
KR100673778B1 (ko) * | 2005-08-19 | 2007-01-24 | 제일모직주식회사 | 저온 속경화형 이방성 도전 필름용 조성물, 그로부터제조된 이방성 도전 필름 및 그 제조방법 |
US20080206622A1 (en) * | 2006-06-06 | 2008-08-28 | Naoki Mitsuta | Sealing member for fuel cell, method for producing the same and separator for fuel cell |
KR101097428B1 (ko) * | 2008-12-11 | 2011-12-23 | 제일모직주식회사 | 이방 전도성 필름용 조성물 및 이를 이용한 이방 전도성 필름 |
TWI390005B (zh) * | 2008-12-31 | 2013-03-21 | Eternal Chemical Co Ltd | 無溶劑導電膠組成物及使用該組成物之太陽能電池元件 |
CN101969312A (zh) * | 2010-08-20 | 2011-02-09 | 宇龙计算机通信科技(深圳)有限公司 | 一种电子终端电源管理控制方法和电子终端 |
KR101279975B1 (ko) * | 2010-10-05 | 2013-07-05 | 제일모직주식회사 | 도체간 전기적 접속 재료 |
JP5816044B2 (ja) * | 2011-09-29 | 2015-11-17 | 太陽ホールディングス株式会社 | 導電性樹脂組成物、導電性樹脂硬化物および導体回路パターン |
JP6181907B2 (ja) * | 2011-11-15 | 2017-08-16 | 互応化学工業株式会社 | カルボキシル基含有樹脂及びソルダーレジスト用樹脂組成物 |
DE102014004751A1 (de) * | 2013-04-04 | 2014-10-09 | Daimler Ag | Epoxymethacrylat-basierter Klebstoff für Strömumgsfeldplatten von Brennstoffzellen |
JP6232823B2 (ja) * | 2013-08-08 | 2017-11-22 | 日清紡ケミカル株式会社 | 燃料電池セパレータ |
CN106415880A (zh) * | 2014-06-30 | 2017-02-15 | 东洋橡胶工业株式会社 | 密闭型二次电池的变形检测传感器、密闭型二次电池、及密闭型二次电池的变形检测方法 |
JP5880649B1 (ja) * | 2014-09-08 | 2016-03-09 | 日清紡ケミカル株式会社 | 燃料電池セパレータ |
KR102644661B1 (ko) * | 2015-12-21 | 2024-03-07 | 디아이씨 가부시끼가이샤 | 프리프레그 및 성형품 |
DE102020005165A1 (de) * | 2020-08-24 | 2022-02-24 | Cellcentric Gmbh & Co. Kg | Bipolarplatte und Verfahren zur Herstellung |
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- 2004-03-05 CA CA002503157A patent/CA2503157A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
US7858696B2 (en) | 2010-12-28 |
US20060060824A1 (en) | 2006-03-23 |
DE602004002096T2 (de) | 2007-03-15 |
DE602004002096D1 (de) | 2006-10-05 |
CA2503157A1 (en) | 2004-09-23 |
CN100343297C (zh) | 2007-10-17 |
EP1602674A1 (en) | 2005-12-07 |
CN1705692A (zh) | 2005-12-07 |
EP1602674B1 (en) | 2006-08-23 |
KR20050105974A (ko) | 2005-11-08 |
EP1602674A4 (en) | 2006-01-18 |
KR100987683B1 (ko) | 2010-10-13 |
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