Highly heat-resistant composition

Abstract

To provide a heat-resistant coating film excellent in thermal conductivity, electrical conductivity, etc.SOLUTION: A thermally and electrically conductive material is used.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a high heat resistant composition. [Background technology]

[0002] Patent Document 1 discloses a composition containing organic polymer particles and a thermally conductive filler having a graphite-like structure, the composition containing 5 to 60% by weight of organic polymer particles and 40 to 95% by weight of the thermally conductive filler having a graphite-like structure, based on a total amount of 100% by weight of these, in which the thermally conductive filler is dispersed by delamination while maintaining the average surface particle size of the thermally conductive filler, and in which infinitely large thermally conductive clusters are formed, at a temperature equal to or higher than the deflection temperature under load, melting point, or glass transition temperature of the organic polymer, and at a pressure of 1 to 1,000 kgf / cm. 2 and then cooling and solidifying the resulting material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] WO-A1-2014 / 080743 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a heat-resistant coating film having excellent thermal conductivity, electrical conductivity, etc. [Means for solving the problem]

[0005] The present invention encompasses the following thermally and electrically conductive materials: Section 1. 1. A thermally and electrically conductive composition comprising: (A) flaky carbon having a thickness of 1 nm to 100 nm; (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (C) A thermally and electrically conductive composition containing a swelling clay mineral.

[0006] Section 2. Item 2. The thermally and electrically conductive composition according to item 1, wherein the hydrophilic group of the organic compound (B) is at least one hydrophilic group selected from the group consisting of the following general formulae (1) to (4): [ka] [Formula (1) represents an alcoholic hydroxyl group or a phenolic hydroxyl group.] In formula (2), R represents a divalent organic group, and both oxygen atoms represent an ether bond. In formula (3), X 1 represents a hydrogen atom, an alkali metal, NH4, or an organic ammonium. In formula (4), X 2 represents a hydrogen atom, an alkali metal, NH4, an organic ammonium, or an alkyl group.

[0007] Section 3. 2. The thermally and electrically conductive composition according to Item 1, wherein the hydrophilic group of the organic compound (B) is a phenolic hydroxyl group or a polyoxyethylene group.

[0008] Section 4. Item 2. The thermally and electrically conductive composition according to Item 1, wherein the carbon-affinity hydrophobic group of the organic compound (B) is at least one carbon-affinity hydrophobic group selected from the group consisting of an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, and a polyoxyalkylene group having 3 or more carbon atoms.

[0009] Section 5. 2. The thermally and electrically conductive composition according to Item 1, wherein the carbon-affinic hydrophobic group of the organic compound (B) is an aryl group having two or more aromatic rings.

[0010] Section 6. 2. The thermally and electrically conductive composition according to Item 1, wherein the (C) swelling clay mineral is smectite.

[0011] Section 7. Item 2. The thermally and electrically conductive composition according to Item 1, wherein the (C) swelling clay mineral is at least one smectite selected from the group consisting of montmorillonite, beidellite, nontronite, saponite, hectorite, sauconite, and stevensite.

[0012] Section 8. Item 2. The thermally and electrically conductive composition according to Item 1, wherein the (C) swelling clay mineral is hectorite.

[0013] Section 9. Item 2. The thermally and electrically conductive composition according to Item 1, wherein the (C) swelling clay mineral is water-dispersible.

[0014] Section 10. In the composition, The content ratio of the (A) flaky carbon and the (C) swelling clay compound is (A) Flake carbon: per 1 mass (C) swelling clay compound: 0.1 mass to 1 mass ratio; Item 1. The thermally and electrically conductive composition according to item 1.

[0015] Section 11. A thermally conductive and electrically conductive paint, (A) flaky carbon having a thickness of 1 nm to 100 nm; (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (C) a swelling clay mineral; (D) A thermally and electrically conductive paint containing a solvent.

[0016] Section 12. the (D) solvent contains water and an organic solvent, The ratio of water in the solvent is 20% by mass to 95% by mass. Item 12. The thermally and electrically conductive paint according to Item 11.

[0017] Section 13. In the paint, The total content of the (A) flaky carbon and the (C) swelling clay compound is Item 12. The thermally and electrically conductive paint according to item 11, wherein the content is 0.1% by weight to 6% by weight.

[0018] Section 14. A paint containing the thermally and electrically conductive composition according to any one of items 1 to 10, or 14. The thermally and electrically conductive paint according to any one of items 11 to 13. A coating film formed by the above.

[0019] Section 15. A method for producing a thermally and electrically conductive paint, (1) (A) a dispersion containing 1% by mass to 10% by mass of flaky carbon having a thickness of 1 nm to 100 nm and (C) a dispersion containing 0.1% by mass to 10% by mass of a swelling clay mineral, (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (D) a solvent, A manufacturing method for thermally and electrically conductive paint.

[0020] The present invention makes it possible to produce a heat-resistant coating film with excellent thermal conductivity, electrical conductivity, etc., by using a specific organic compound, flaky carbon having a specific thickness, and an expandable clay mineral. [Effects of the Invention]

[0021] The present invention makes it possible to provide a heat-resistant coating film that is excellent in thermal conductivity, electrical conductivity, and the like. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be described in detail below.

[0023] The embodiments of the present invention are intended to provide a better understanding of the gist of the invention, and unless otherwise specified, do not limit the content of the invention.

[0024] In this specification, the terms "comprise" and "contain" are concepts that encompass all of "comprise," "consist essentially of," and "consist only of."

[0025] In this specification, when a numerical range is expressed as "A to B," it means "not less than A and not more than B."

[0026] In this specification, the expressions parts, % and the like are generally used.

[0027] In this specification, unless otherwise specified, all parts by mass or % by mass (wt%) are used.

[0028] [1] Thermal and electrical conductive materials Crystalline carbon materials such as graphite and carbon nanotubes have high thermal and electrical conductivity and are used as thermal and electrical conductive materials.

[0029] When carbon materials are used in paint, the thermal resistance between the resin and the carbon is large, and further study is required on the thermal and electrical conductivity. Carbon materials have low affinity with resin, so if the amount of carbon material added is increased to improve the thermal and electrical conductivity of the paint, further study is required on the coating strength of the paint.

[0030] In the case of paints that use organic resins, further consideration is needed regarding their low heat resistance.

[0031] A graphene sheet is a two-dimensional monolayer sheet in which carbon atoms are arranged in a honeycomb lattice, and is the building block of graphite, fullerenes, carbon nanotubes, etc.

[0032] Flaky carbon, which is composed of graphene sheets stacked to a thickness of approximately 100 nm or less (in this invention, flaky carbon includes graphene sheets), has unique physical properties and is attracting attention as a new material.

[0033] Nanocarbon materials such as flaky carbon have extremely high thermal and electrical conductivity. However, the finer the structure of nanocarbon materials, the more likely they are to aggregate. Therefore, further research is needed to fully utilize the thermal and electrical conductivity of nanocarbon materials.

[0034] Nanocarbon materials are difficult to form into films or to use in paints, so further study is needed to determine their usability. When combined with resins, nanocarbon materials can be incompatible and not disperse well, resulting in paints that do not coat well or do not adhere well after application. In such cases, paints containing nanocarbon materials may have reduced thermal and electrical conductivity, so further study is needed.

[0035] Paints that use organic resins have low heat resistance, and further consideration is needed regarding their use under high temperature conditions.

[0036] The inventors have made it possible to produce a heat-resistant coating film with excellent thermal conductivity, electrical conductivity, etc., by using a specific organic compound, flaky carbon having a specific thickness, and an expandable clay mineral.

[0037] The thermally and electrically conductive material of the present invention contains flaky carbon having a thickness of 1 nm to 100 nm and a swelling clay compound.

[0038] The thermally and electrically conductive composition of the present invention comprises: (A) flaky carbon having a thickness of 1 nm to 100 nm; (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (C) a swelling clay mineral; Contains:

[0039] (1-1)(A) Flake carbon The flaky carbon is preferably thin because it has excellent thermal conductivity and heat dissipation properties. The thickness of the flaky carbon is specifically 1 nm to 100 nm, preferably 1 nm to 20 nm. When the thickness of the flaky carbon is 100 nm or less, a thermally conductive material having sufficient thermal conductivity and heat dissipation properties can be obtained.

[0040] In the thermally and electrically conductive composition, the content of flaky carbon having a thickness of 1 nm to 20 nm is preferably 80 mass% or more, more preferably 90 mass% or more, based on 100 mass% of the total number of flaky carbon. The thermally and electrically conductive composition may contain flaky carbon having a thickness of more than 20 nm. In the thermally and electrically conductive composition, the thickness of most of the flaky carbon is preferably adjusted to 20 nm or less.

[0041] The thickness of the flaky carbon is measured by observation using a transmission electron microscope (TEM).

[0042] The flaky carbon is preferably flaky carbon having a layered structure in which 300 or less layers of graphene (i.e., 1 to 300 layers) are stacked, more preferably flaky carbon having a layered structure in which 1 to 60 layers of graphene are stacked, and even more preferably flaky carbon having a layered structure in which 1 to 30 layers of graphene are stacked.

[0043] In the thermally and electrically conductive composition, the content of flaky carbon having 1 to 30 lamination layers is preferably 80% by mass or more, and more preferably 90% by mass or more, based on 100% by mass of the total number of flaky carbon. The thermally and electrically conductive composition may contain flaky carbon having a large number of lamination layers and a large thickness. In the thermally and electrically conductive composition, the thickness of the multiple flaky carbons is preferably 30 layers or less.

[0044] The thickness of the flaky carbon lamination is calculated from the thickness measured by observation with a transmission electron microscope (TEM).

[0045] Since flaky carbon usually has a planar shape with many convex and concave angles, it is difficult to define its size in general terms other than thickness. In this specification, the size of a piece of flaky carbon is defined as the distance between the furthest convex angles in the piece of flaky carbon.

[0046] The size of the flaky carbon (the distance between the furthest convex angles on a single piece of flaky carbon) is preferably 100 nm or more, more preferably 500 nm or more, and even more preferably 1000 nm or more. By using flaky carbon with a size within this range in the thermally and electrically conductive composition, it is possible to further improve thermal conductivity and heat dissipation.

[0047] Since larger flaky carbon is preferable because it has better thermal conductivity and heat dissipation properties, there is no particular upper limit to the size of the flaky carbon, and the upper limit of the size of the flaky carbon is usually about 100 μm.

[0048] The size of the flaky carbon is measured by observation using a transmission electron microscope (TEM).

[0049] The content of flaky carbon in the thermally and electrically conductive composition (thermally conductive material) is not particularly limited. From the viewpoint of thermal conductivity and heat dissipation, the content of flaky carbon in the thermally and electrically conductive composition is preferably adjusted to 50% to 99.5% by mass, and more preferably adjusted to 60% to 99.2% by mass, based on 100% by mass of the total amount of the thermally and electrically conductive composition.

[0050] (1-2)(B) Organic compounds having hydrophilic groups and carbon-affinic hydrophobic groups To prepare a thermally and electrically conductive composition (thermal conductive material), (A) a dispersion containing flaky carbon with a thickness of 1 nm to 100 nm is mixed with (C) a dispersion containing a swelling clay mineral. Since the paint is produced by mixing the liquids in this manner, (B) an organic compound having a hydrophilic group and a carbon-affinitive hydrophobic group is required.

[0051] The thermally and electrically conductive composition uses an organic compound having a hydrophilic group and a carbon-affinitive hydrophobic group. By using the organic compound, the flaky carbon that maintains the graphene structure can be maintained in a uniformly dispersed state without agglomeration. The organic compound can also function as a dispersant to uniformly disperse the flaky carbon.

[0052] The organic compound is not particularly limited, and a wide variety of organic compounds (particularly water-soluble compounds) that can function as a dispersant for flaky carbon can be used.

[0053] (B) Carbon-philic hydrophobic groups possessed by organic compounds (B) The carbon-affinity hydrophobic group contained in the organic compound is not particularly limited. The carbon-affinity hydrophobic group is preferably an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, a polyoxyalkylene group having 3 or more carbon atoms, or the like. The organic compound can contain one or more types of carbon-affinity hydrophobic groups. When the organic compound has multiple carbon-affinity hydrophobic groups, the multiple carbon-affinity hydrophobic groups may be the same or different.

[0054] Alkyl group (including as a substituent) The alkyl group may be a chain alkyl group or a branched alkyl group. From the viewpoint of affinity with carbon, the alkyl group is preferably a chain alkyl group. In consideration of affinity with carbon, the number of carbon atoms in the alkyl group is preferably 6 or more, more preferably 8 to 28, and even more preferably 10 to 22. The alkyl group having the above carbon number is preferably a hexyl group, octyl group, decyl group, undecyl group, dodecyl group (or lauryl group), tridecyl group, tetradecyl group (or myristyl group), pentadecyl group, hexadecyl group (or cetyl group), octadecyl group, icosyl group, etc.

[0055] The alkyl group may or may not have a substituent. The substituent that the alkyl group has is preferably a cycloalkyl group, an aryl group, an aralkyl group, or the like.

[0056] The cycloalkyl group and aryl group as the substituent will be described later.

[0057] The aralkyl group as a substituent of the alkyl group is preferably an aralkyl group having 7 to 14 carbon atoms and containing an aryl group described below and an alkyl group having 1 to 6 carbon atoms, and more preferably a benzyl group, a phenethyl group, or the like.

[0058] The substituents on the alkyl group are not limited to the above-mentioned substituents. The substituents on the alkyl group may also be substituents having a group derived from a fluorene structure (such as a fluorenyl group). When using the (B) organic compound, if importance is placed on water solubility, the substituent is preferably a phenyl group or the like. When using the (B) organic compound, if importance is placed on compatibility with the (A) flaky carbon, the substituent is preferably a naphthyl group, a fluorenyl group, or the like.

[0059] Alkenyl group In consideration of the affinity with carbon and the water solubility of the compound, the alkenyl group preferably has 4 or more carbon atoms, more preferably 6 to 100, and even more preferably 8 to 30. The alkenyl group having the above carbon number is preferably an oleyl group, a linoleyl group, or the like.

[0060] The alkenyl group may or may not have a substituent, and the substituent that the alkenyl group has is preferably an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group, or the like.

[0061] The alkyl group and aralkyl group as the substituent are as described above.

[0062] The cycloalkyl group and aryl group as the substituent will be described later.

[0063] The alkyl group as a substituent of the alkenyl group is preferably an alkyl group having 1 to 6 carbon atoms, and more preferably a methyl group, ethyl group, propyl group, butyl group, tert-butyl group, or the like.

[0064] The substituent of the alkenyl group is not limited to the above-mentioned substituents. The substituent of the alkenyl group may also be a substituent having a group derived from a fluorene structure (such as a fluorenyl group). When using the (B) organic compound, if importance is placed on water solubility, the substituent is preferably a phenyl group or the like. When using the (B) organic compound, if importance is placed on compatibility with the (A) flaky carbon, the substituent is preferably a naphthyl group, a fluorenyl group, or the like.

[0065] Cycloalkyl group (including as a substituent) The cycloalkyl group is preferably a cycloalkyl group having 5 to 10 carbon atoms (more preferably 5 to 8, particularly preferably 5 to 6), and more preferably a cyclopentyl group, a cyclohexyl group, or the like.

[0066] The cycloalkyl group may or may not have a substituent. The substituent that the cycloalkyl group has is preferably an alkyl group, an aryl group, an aralkyl group, or the like.

[0067] The alkyl group as a substituent of the cycloalkyl group is preferably an alkyl group having 1 to 6 carbon atoms, more preferably a methyl group, an ethyl group, a propyl group, a butyl group, a tert-butyl group, or the like.

[0068] The alkyl group and aralkyl group as the substituent are as described above.

[0069] The aryl group as the substituent will be described later.

[0070] The substituents of the cycloalkyl group are not limited to the above-mentioned substituents. The substituents of the cycloalkyl group may be substituents having a group derived from a fluorene structure (such as a fluorenyl group). When using the (B) organic compound, if importance is placed on water solubility, the substituent is preferably a phenyl group or the like. When using the (B) organic compound, if importance is placed on compatibility with the (A) flaky carbon, the substituent is preferably a naphthyl group, a fluorenyl group, or the like.

[0071] Aryl group (including as a substituent) The aryl group is preferably an aryl group having 6 to 18 carbon atoms (particularly preferably 6 to 14 carbon atoms), more preferably a monocyclic aryl group, a fused ring aryl group, a polycyclic aryl group, etc., and even more preferably a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a biphenyl group, a terphenyl group, a fluorenyl group, a pyrenyl group, a triphenylenyl group, etc. From the viewpoint of affinity with carbon, the aryl group is preferably an aryl group having two or more aromatic rings (a fused ring aryl group and a polycyclic aryl group).

[0072] The aryl group may or may not have a substituent, and the substituent that the aryl group has is preferably an alkyl group, a cycloalkyl group, an aralkyl group, or the like.

[0073] The alkyl group as a substituent of the aryl group is preferably an alkyl group having 1 to 6 carbon atoms, more preferably a methyl group, ethyl group, propyl group, butyl group, tert-butyl group, or the like.

[0074] The cycloalkyl group and aralkyl group as the substituent are as described above.

[0075] The substituents on the aryl group are not limited to the above-mentioned substituents, but may also include a group derived from a fluorene structure (such as a fluorenyl group).

[0076] Polyoxyethylene group Polyoxyethylene groups are usually hydrophilic. Polyoxyalkylene groups having 3 or more carbon atoms, such as polyoxypropylene groups and polyoxybutylene groups, become more hydrophobic as the degree of polymerization increases, and function as hydrophobic groups. Polyoxyalkylene groups are particularly preferably polyoxypropylene groups with a degree of polymerization of 4 or more and polyoxybutylene groups with a degree of polymerization of 3 or more. For example, when polyoxyethylene-polyoxypropylene or polyoxyethylene-polyoxybutylene is used as an organic compound having a hydrophilic group and a carbon-affinic hydrophobic group, the polyoxypropylene group and polyoxybutylene group can also function as hydrophobic groups.

[0077] The polyoxyalkylene group having 3 or more carbon atoms may or may not have a substituent. The substituent that the polyoxyalkylene group having 3 or more carbon atoms has is preferably an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, or the like.

[0078] The alkyl group as a substituent of the polyoxyalkylene group having 3 or more carbon atoms is preferably an alkyl group having 1 to 6 carbon atoms, more preferably a methyl group, ethyl group, propyl group, butyl group, tert-butyl group, or the like.

[0079] The cycloalkyl group, aralkyl group and aryl group as the substituent are as described above.

[0080] The substituents on the polyoxyalkylene group having 3 or more carbon atoms are not limited to the above-mentioned substituents. The substituents on the polyoxyalkylene group having 3 or more carbon atoms may have a group derived from a fluorene structure (such as a fluorenyl group). When using the (B) organic compound, if importance is placed on water solubility, the substituent is preferably a phenyl group or the like. When using the (B) organic compound, if importance is placed on compatibility with the (A) flaky carbon, the substituent is preferably a naphthyl group, a fluorenyl group, or the like.

[0081] From the viewpoint of affinity with carbon, the carbon-affinity hydrophobic group contained in the (B) organic compound is preferably an aryl group or a polyoxyalkylene group having 3 or more carbon atoms, more preferably an aryl group, and even more preferably an aryl group having two or more aromatic rings (a fused aryl group or a polycyclic aryl group). Particularly preferred carbon-affinity hydrophobic groups contained in the (B) organic compound are naphthyl, anthracenyl, phenanthrenyl, biphenyl, terphenyl, fluorenyl, pyrenyl, triphenylenyl, polyoxypropylene, polyoxybutylene, and the like.

[0082] (B) Hydrophilic groups possessed by organic compounds The hydrophilic group contained in the (B) organic compound is not particularly limited as long as it can increase the solubility in water of the (B) organic compound having a hydrophilic group and a carbon-affinic hydrophobic group.

[0083] The hydrophilic group of the (B) organic compound is preferably at least one hydrophilic group selected from the group consisting of the following general formulas (1) to (4), taking into consideration the water solubility of the (B) organic compound having a hydrophilic group and a carbon-affinic hydrophobic group, the dispersibility of the flaky carbon, the thermal conductivity, and the heat dissipation properties.

[0084] [ka]

[0085] Formula (1) represents an alcoholic hydroxyl group or a phenolic hydroxyl group.

[0086] In formula (2), R represents a divalent organic group, and both oxygen atoms represent an ether bond.

[0087] In formula (3), X 1 represents a hydrogen atom, an alkali metal, NH4, or an organic ammonium.

[0088] In formula (4), X 2 represents a hydrogen atom, an alkali metal, NH4, an organic ammonium, or an alkyl group.

[0089] The hydrophilic group of the (B) organic compound is preferably a phenolic hydroxyl group or a polyoxyethylene group.

[0090] The carbon-affinity hydrophobic group of (B) the organic compound is preferably at least one carbon-affinity hydrophobic group selected from the group consisting of an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, and a polyoxyalkylene group having 3 or more carbon atoms.

[0091] (B) The carbon-philic hydrophobic group of the organic compound is preferably an aryl group having two or more aromatic rings.

[0092] The organic compound having a hydrophilic group and a carbon-affinity hydrophobic group can contain one or more types of the hydrophilic group. When using multiple hydrophilic groups, multiple types of the same hydrophilic group may be used, or multiple types of hydrophilic groups represented by the same general formula may be used, or multiple types of hydrophilic groups represented by different general formulas may be used.

[0093] Hydrophilic group of general formula (1) General formula (1) represents an alcoholic hydroxyl group or a phenolic hydroxyl group.

[0094] In general formula (1), -OH may be either an alcoholic hydroxyl group or a phenolic hydroxyl group. From the viewpoints of water solubility of the organic compound having a hydrophilic group and a carbon-affinic hydrophobic group, dispersibility of the flaky carbon, thermal conductivity, heat dissipation, etc., an alcoholic hydroxyl group is preferred.

[0095] In general formula (1), when a phenolic hydroxyl group is contained (particularly when multiple phenolic hydroxyl groups are contained), it necessarily contains a benzene ring, which has excellent hydrophobicity, and as a whole, the water solubility of the organic compound having a hydrophilic group and a carbon-affinity hydrophobic group, the dispersibility of the flaky carbon, thermal conductivity, heat dissipation, etc. are also excellent.

[0096] Hydrophilic group of general formula (2) In the general formula (2), R represents a divalent organic group, and both oxygen atoms represent an ether bond.

[0097] In the general formula (2), the divalent organic group represented by R is not particularly limited, and R is preferably a divalent hydrocarbon group.

[0098] The divalent hydrocarbon group is preferably an aliphatic hydrocarbon group (such as an alkylene group (or alkylidene group), a cycloalkylene group, an alkylene (or alkylidene)-cycloalkylene group, or a bi- or tricycloalkylene group), or an aromatic hydrocarbon group (such as an arylene group, an alkylene (or alkylidene)-arylene group), or the like.

[0099] In the general formula (2), the alkylene group (or alkylidene group) represented by R is preferably an alkylene group, more preferably C 1-8 alkylene group, more preferably C 1-4 An alkylene group is particularly preferably C 2-4 alkylene groups, most preferably C 2-3 R is preferably a methylene group, an ethylene group, an ethylidene group, a trimethylene group, a propylene group, a propylidene group, a tetramethylene group, an ethylethylene group, a butan-2-ylidene group, a 1,2-dimethylethylene group, a pentamethylene group, a pentane-2,3-diyl group, or the like.

[0100] In the general formula (2), the cycloalkylene group represented by R is preferably C 5-10 is a cycloalkylene group, more preferably C 5-8 R is a cycloalkylene group. R is preferably a cyclopentylene group, a cyclohexylene group, a methylcyclohexylene group, a cycloheptylene group, or the like.

[0101] In the general formula (2), the alkylene (or alkylidene)-cycloalkylene group represented by R is preferably an alkylene-cycloalkylene group, more preferably C 1-6 Alkylene-C 5-10A cycloalkylene group, more preferably C 1-4 Alkylene-C 5-8 R is a cycloalkylene group. R is preferably a methylene-cyclohexylene group, an ethylene-cyclohexylene group, an ethylene-methylcyclohexylene group, an ethylidene-cyclohexylene group, or the like.

[0102] In the general formula (2), the bi- or tricycloalkylene represented by R is preferably a norbornane-diyl group or the like.

[0103] In the general formula (2), the arylene group represented by R is preferably C 6-10 R is an arylene group. R is preferably a phenylene group, a naphthalenediyl group, or the like.

[0104] In the general formula (2), the alkylene (or alkylidene)-arylene group represented by R is preferably an alkylene-arylene group, more preferably C 1-6 Alkylene-C 6-20 An arylene group, more preferably C 1-4 Alkylene-C 6-10 An arylene group, particularly preferably C 1-2 R is an alkylene-phenylene group. R is preferably a methylene-phenylene group, an ethylene-phenylene group, an ethylene-methylphenylene group, an ethylidenephenylene group, or the like.

[0105] Formula (2) is preferably a divalent aliphatic hydrocarbon group, particularly preferably an alkylene group (e.g., a C alkylene group such as a methylene group or an ethylene group). 1-4 alkylene groups, etc.).

[0106] The alkylene (or alkylidene)-cycloalkylene group and the alkylene (alkylidene)-arylene group refer to groups represented by the following formula: -Ra-Rb-

[0107] In the formula, Ra represents an alkylene group or alkylidene group bonded to each of the oxygen atoms in general formula (2). In the formula, Rb represents a cycloalkylene group or an arylene group.

[0108] The hydrophilic group represented by the general formula (2) is not particularly limited. The hydrophilic group represented by the general formula (2) may preferably be -OC2H4O-, -OC3H6O-, -OCH2O-, or the like. Groups having a plurality of these (preferably 3 to 100 groups) may also be preferably used. For example, polyoxymethylene groups, polyoxyethylene groups, polyoxypropylene groups, or the like may be preferably used.

[0109] In particular, when the hydrophilic group represented by general formula (2) has a structure in which three or more polymerized groups are present, the hydrophilicity decreases and the hydrophobicity increases as the number of carbon atoms in R increases (for example, the number of carbon atoms is 3 or more). Therefore, -OC2H4O-, -OCH2O-, etc., which can maintain hydrophilicity even when the degree of polymerization increases, are preferred.

[0110] Hydrophilic group of general formula (3) In general formula (3), X 1 represents a hydrogen atom, an alkali metal, NH4, or an organic ammonium.

[0111] In general formula (3), X 1 The alkali metal represented by X is not particularly limited. 1 is preferably sodium, potassium, lithium, etc.

[0112] In general formula (3), X 1 The organic ammonium represented by the formula (I) is preferably a quaternary ammonium, more preferably tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, or the like.

[0113] The hydrophilic group represented by general formula (3) is not particularly limited. The hydrophilic group is preferably -SO3 - H + , -SO3 - Na+ , -SO3 - K + , -SO3 - Li + , -SO3 - NH4 + , -SO3 - N(CH3)4 + , -SO3 - N(C2H5)4 + , -SO3 - N(C3H7)4 + , -SO3 - N(C4H9)4 + etc.

[0114] Hydrophilic group of general formula (4) In general formula (4), X 2 represents a hydrogen atom, an alkali metal, NH4, an organic ammonium, or an alkyl group.

[0115] In general formula (4), X 2 The alkali metal and organic ammonium represented by the formula (3) are 1 This is what was explained in.

[0116] In general formula (4), X 2 The alkyl group represented by may be a chain alkyl group or a branched alkyl group. From the viewpoint of affinity with carbon, the alkyl group is preferably a chain alkyl group. From the viewpoint of affinity with carbon, the number of carbon atoms in the alkyl group is preferably 1 to 2.

[0117] The hydrophilic group represented by general formula (4) is not particularly limited. The hydrophilic group is preferably -COOH, -COONa, -COOK, -COOLi, or -COONH4. + , -COON(CH3)4 + , -COON(C2H5)4 + , -COON(C3H7)4 + , -COON(C4H9)4 + etc.

[0118] The hydrophilic group is preferably a hydrophilic group represented by general formula (2). The hydrophilic group represented by general formula (2) is excellent in terms of water solubility of the organic compound having the (B) hydrophilic group and the carbon-affinic hydrophobic group, stability unaffected by pH, dispersibility of the (A) flaky carbon, thermal conductivity of the thermally and electrically conductive composition, and heat dissipation of the thermally and electrically conductive composition.

[0119] (B) When an organic compound has multiple identical hydrophilic groups represented by general formula (2), i.e., when it has a polymerized structure, the hydrophilicity of the water-soluble compound increases as the degree of polymerization increases for compounds with two or fewer carbon atoms. (B) When an organic compound has multiple identical hydrophilic groups represented by general formula (2), i.e., when it has a polymerized structure, the hydrophobicity increases as the degree of polymerization increases for compounds with three or more carbon atoms.

[0120] In the organic compound having (B) a hydrophilic group and a carbon-affinity hydrophobic group, the number of carbon atoms in the constituent parts other than the hydrophilic group (such as the hydrophobic group) is preferably 6 or more, and more preferably 8 to 18, from the viewpoints of the water solubility of the organic compound having (B) a hydrophilic group and a carbon-affinity hydrophobic group, the dispersibility of the flaky carbon, thermal conductivity, heat dissipation, etc.

[0121] When a nonionic material (such as a nonionic surfactant) is used as the organic compound having (B) a hydrophilic group and a carbon-affinity hydrophobic group, the HLB value thereof is preferably 12 or more, more preferably 13 to 19, from the viewpoints of the water solubility of the organic compound having (B) a hydrophilic group and a carbon-affinity hydrophobic group, the dispersibility of (A) the flaky carbon, the thermal conductivity of the thermally and electrically conductive composition, and the heat dissipation property of the thermally and electrically conductive composition. When a nonionic material (such as a nonionic surfactant) is used, and the hydrophobic group is the same (when the affinity with the flaky carbon is about the same), the higher the HLB value, the better.

[0122] The (B) organic compound having a hydrophilic group and a carbon-affinity hydrophobic group is not particularly limited. The (B) organic compound having a hydrophilic group and a carbon-affinity hydrophobic group may be an aromatic water-soluble compound or a non-aromatic water-soluble compound. The (B) organic compound having a hydrophilic group and a carbon-affinity hydrophobic group is preferably an aromatic water-soluble compound.

[0123] (B) The organic compound having a hydrophilic group and a carbon-affinity hydrophobic group is preferably polyoxyethylene lauryl ether, polyoxyethylene decyl ether, polyoxypropylene decyl ether, polyoxyethylene lauryl ether, polyoxyethylene naphthyl ether, polyoxypropylene lauryl ether, polyoxypropylene naphthyl ether, polyoxyethylene myristyl ether, polyoxypropylene myristyl ether, polyoxyethylene cetyl ether, polyoxypropylene cetyl ether, polyoxyethylene octylphenyl ether, polyoxypropylene octylphenyl ether, polyoxyethylene undecyl ether, phenyl ether, polyoxypropylene undecyl phenyl ether, polyoxyethylene tridecyl phenyl ether, polyoxypropylene tridecyl phenyl ether, polyoxyethylene pentadecyl phenyl ether, polyoxypropylene pentadecyl phenyl ether, polyoxyethylene polyoxypropylene glycol, polyoxypropylene polyglyceryl ether, sodium cholate, potassium cholate, sodium dodecyl sulfonate, potassium dodecyl sulfonate, sodium dilauroyl glutamate lysine, potassium dilauroyl glutamate lysine, decaglycerin laurate, n-decyl alcohol, etc.

[0124] (B) Organic compounds having a hydrophilic group and a carbon-affinity hydrophobic group are preferably used, such as Emulgen 103, Emulgen 104P, Emulgen 105, Emulgen 106, Emulgen 108, Emulgen 109P, Emulgen 120, Emulgen 123P, Emulgen 130K, Emulgen 147, Emulgen 150, Emulgen 210P, and Emulgen 220 (polyoxyethylene alkyl ethers manufactured by Kao Corporation), Triton X-100, Triton X-114, Triton X-305, and Triton X-405 (polyoxyethylene octylphenyl ethers manufactured by Dow Chemical Company), Noigen EN, and Noigen EN-10 (polyoxyethylene naphthyl ethers manufactured by Daiichi Kogyo Seiyaku Co., Ltd.).

[0125] The content of (B) the organic compound having a hydrophilic group and a carbon affinity hydrophobic group in the thermally and electrically conductive composition (thermally conductive material) of the present invention is not particularly limited. In order to impart sufficient thermal conductivity and heat dissipation properties to the thermally and electrically conductive composition, the content of (B) the organic compound having a hydrophilic group and a carbon affinity hydrophobic group is preferably adjusted to 0.5 to 50 mass %, more preferably 0.8 to 40 mass %, based on 100 mass % of the total amount of the thermally and electrically conductive composition.

[0126] In order to provide the thermally and electrically conductive composition with sufficient thermal conductivity and heat dissipation properties, the content of (B) the organic compound having a hydrophilic group and a carbon-affinitive hydrophobic group is preferably adjusted to 1 to 100 parts by mass, more preferably 2 to 80 parts by mass, per 100 parts by mass of (A) the flaky carbon.

[0127] When the content of (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group is small, the thermally conductive and electrically conductive composition has a configuration in which the surface of (A) flaky carbon is coated with (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group.

[0128] When the thermally conductive and electrically conductive composition contains a large amount of (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group, the composition has a configuration in which (A) flaky carbon is dispersed in (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group.

[0129] In both cases, the thermally conductive and electrically conductive composition has (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group interposed around the (A) flaky carbon, which suppresses the aggregation of the (A) flaky carbon and allows for the production of a material with excellent thermal conductivity and heat dissipation properties.

[0130] (1-3)(C) Swelling clay minerals The swelling clay compound is an inorganic material, and may have an organic group adsorbed thereon or may contain an organic group in its adsorbed structure.

[0131] By using (C) an expanding clay mineral together with (A) flaky carbon, the effect of increasing the dispersibility of (A) flaky carbon, the effect of increasing the adhesion of the thermally and electrically conductive composition to the substrate, the effect of suppressing cracks in the coating film made of the thermally and electrically conductive composition, and the like can be achieved without using organic materials.

[0132] By using (C) a swelling clay mineral in a thermally and electrically conductive composition, the thermally and electrically conductive composition is expected to have higher thermal conductivity and electrical conductivity than when an organic polymer is used.

[0133] By using a highly heat-resistant swelling clay mineral, and by using (A) flaky carbon with high dispersibility and (C) swelling clay mineral, the thermally and electrically conductive composition can produce a coating film with high heat resistance, thermal conductivity, and electrical conductivity compared to when organic polymers are used.

[0134] The (C) swelling clay mineral is preferably smectite. The swelling clay mineral is preferably a layered silicate having the same two-dimensional shape as the (A) flaky carbon, and more preferably smectite.

[0135] The (C) swelling clay mineral is preferably a swelling clay mineral containing sodium and magnesium. The (C) swelling clay mineral is preferably a swelling clay mineral further containing lithium.

[0136] The (C) swelling clay mineral is preferably water-dispersible, and from the viewpoint of being easily dispersed when mixed with the (A) aqueous dispersion of flaky carbon, the swelling clay mineral is preferably one that disperses in water, more preferably a swelling clay mineral containing sodium and magnesium, and even more preferably a swelling clay mineral that further contains lithium.

[0137] The swelling clay mineral (C) is preferably at least one smectite selected from the group consisting of montmorillonite, beidellite, nontronite, saponite, hectorite, sauconite, and stevensite, and more preferably hectorite.

[0138] The (C) swelling clay mineral preferably has a structure represented by the following formula: Na (x) (Mg (y) ,Li (3-y) ) (Si (z) Al (4-z) )O 10 (OH)2 In the formula, x is equal to or greater than 0.3 and equal to or less than 0.4. In the formula, y is 0.25 or more and 3 or less. In the formula, z is 3 or more and 4 or less.

[0139] The swelling clay mineral is preferably Na 0.33 (Mg,Li)3Si4O 10 (OH)2, or Na 0.3 (Mg,Li)3Si4O 10 (OH)2 It is hectorite, which is represented by the formula:

[0140] The thermally and electrically conductive composition of the present invention comprises: In the thermally and electrically conductive composition, preferably The content ratio of (A) flaky carbon and (C) swelling clay compound is (A) Flake carbon: per 1 mass (C) Swelling clay compound: 0.1 to 1 mass ratio.

[0141] (1-4)(D) Solvent The thermally and electrically conductive composition of the present invention can be preferably applied in a state where it is dispersed in the solvent (D).

[0142] The present invention provides (A) flaky carbon having a thickness of 1 nm to 100 nm; (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (C) a swelling clay mineral; (D) A thermally and electrically conductive paint containing a solvent.

[0143] The (D) solvent preferably contains water and an organic solvent, and the proportion of water in the solvent is 20% by mass to 95% by mass.

[0144] The solvent is not particularly limited. The solvent preferably contains water. When the solvent contains water and an organic solvent, the proportion of water is preferably 20% by mass to 95% by mass.

[0145] In the thermally and electrically conductive paint, the total content of the (A) flaky carbon and the (C) swelling clay compound is preferably 0.1% by weight to 6% by weight.

[0146] The organic solvent can be used to control volatility and improve wettability, and is a solvent that is compatible with water, and is preferably an alcohol-based solvent, a glycol-based solvent, or the like.

[0147] Alcohol-based solvents The alcohol-based solvent is preferably a water-soluble alcohol, more preferably methanol, ethanol, 1-propanol, 2-propanol, t-butyl alcohol, or 2-butanol. As the alcohol-based solvent, a water-soluble solvent with a high boiling point, such as 3-methoxy-3-methyl-1-butanol, may be used. Acetylenic alcohols may be added to the alcohol-based solvent to improve leveling properties, dispersibility, etc.

[0148] Glycol-based solvents The glycol-based solvent is preferably ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol monoisopropyl ether, ethylene glycol mono-n-butyl ether, ethylene glycol monoisobutyl ether, ethylene glycol mono-t-butyl ether, ethylene glycol monomethyl ether acetate, propylene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol monoisopropyl ether, propylene glycol mono-n-butyl ether, propylene glycol monoisobutyl ether, propylene glycol mono-t-butyl ether, propylene glycol mono Examples of the alkyl ethers include methyl ether acetate, diethylene glycol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-propyl ether, diethylene glycol monoisopropyl ether, diethylene glycol mono-n-butyl ether, diethylene glycol monoisobutyl ether, diethylene glycol mono-t-butyl ether, dipropylene glycol, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, dipropylene glycol monoisopropyl ether, dipropylene glycol mono-n-butyl ether, dipropylene glycol monoisobutyl ether, dipropylene glycol mono-t-butyl ether, and diethylene glycol dimethyl ether.

[0149] The glycol-based solvent is preferably an ethylene glycol-based solvent, and may be a triethylene glycol derivative or a tetraethylene glycol derivative as long as it is water-soluble.

[0150] More preferred glycol solvents are ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol monoisopropyl ether, ethylene glycol mono-n-butyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol monoisopropyl ether, propylene glycol mono-n-butyl ether, and the like.

[0151] The present invention includes a paint containing the thermally and electrically conductive composition of the present invention, and a coating film formed by the thermally and electrically conductive paint.

[0152] The thermally and electrically conductive composition of the present invention is a material with excellent thermal conductivity and heat dissipation properties. The thermally and electrically conductive composition of the present invention has excellent thermal conductivity, and after being heated, can dissipate heat more quickly, thereby cooling the temperature. The thermally and electrically conductive composition of the present invention can also function as a thermally conductive and heat-dissipating material.

[0153] The paint containing the thermally and electrically conductive composition of the present invention has excellent thermal conductivity and heat dissipation properties, and can therefore be suitably used for applications such as thermally conductive grease for electronic materials, thermally dissipative paint for electronic materials, thermally conductive rubber for electronic materials, thermally dissipative paint for LEDs, paint for heat sinks, and coatings for various heat exchangers.

[0154] The thermally and electrically conductive composition of the present invention is a material that not only has excellent electrical conductivity but also excellent heat resistance. The thermally and electrically conductive composition of the present invention can be suitably used in conductive paints used in high-temperature environments. The thermally and electrically conductive composition of the present invention can also generate heat by passing a high current through it.

[0155] The paint containing the thermally and electrically conductive composition of the present invention has excellent electrical conductivity and heat resistance, and can therefore be suitably used in applications such as wiring ink, antistatic paint, and heat-generating paint.

[0156] [2] Manufacturing method for thermally and electrically conductive materials The method for producing the thermally and electrically conductive paint of the present invention comprises the steps of: (1) (A) a step of mixing a dispersion containing 1% by mass to 10% by mass of flaky carbon having a thickness of 1 nm to 100 nm with (C) a dispersion containing 0.1% by mass to 10% by mass of a swelling clay mineral; Including, Thermal and electrical conductive paints are (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (D) a solvent.

[0157] The thermally and electrically conductive composition of the present invention can be prepared in the form of a dispersion.

[0158] In the method for producing the thermally and electrically conductive composition of the present invention, preferably, (A) the flaky carbon and (C) the swelling clay compound are each added as solids to a solvent and dispersed therein.

[0159] In the method for producing the thermally and electrically conductive composition of the present invention, in order to maintain dispersibility, it is more preferable to mix (A) flaky carbon and (C) swellable clay compound in the form of a dispersion, or preferably both.

[0160] In the method for producing the thermally and electrically conductive composition of the present invention, for example, a uniform dispersion can be prepared by mixing a dispersion containing 1% to 6% by mass of (A) flaky carbon with a dispersion containing 0.1% to 10% by mass of the swelling clay compound.

[0161] (2-1) Method for producing flaky carbon dispersion In a dispersion (flaky carbon dispersion) containing (A) flaky carbon, (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group, and (D) a solvent, the above-mentioned explanation applies to (A) flaky carbon and (B) the organic compound having a hydrophilic group and a carbon-affinity hydrophobic group.

[0162] The flaky carbon dispersion may contain components other than the above-mentioned components, if necessary.

[0163] The solvent (D) used to prepare the flaky carbon dispersion liquid is preferably water as the main solvent, from the viewpoints of the dispersibility of the flaky carbon, the thermal conductivity and heat dissipation properties of the resulting thermally and electrically conductive composition (thermally conductive material).

[0164] The content of water in the (D) solvent is not particularly limited, but from the viewpoints of the dispersibility of the (A) flaky carbon, the thermal conductivity and heat dissipation of the resulting thermal conductive material, etc., the content of water in the (D) solvent used is preferably 70 mass % or more (70 mass % to 100 mass %), more preferably 75 mass % to 100 mass %, based on 100 mass % of the total amount of the (D) solvent.

[0165] In the method for producing a flaky carbon dispersion, only water may be used as the solvent (D), and an organic solvent is not necessarily used. In order to further improve the solubility of the organic compound having a hydrophilic group and a carbon-affinitive hydrophobic group (B) in water, it is preferable to use an organic solvent such as alcohols (e.g., methanol, ethanol, 2-propanol, tert-butyl alcohol), glycols (e.g., ethylene glycol), glycerin, or 2-methoxyethanol.

[0166] The content of the organic solvent in the (D) solvent is adjusted to preferably 30% by mass or less (0 to 30% by mass), more preferably 5% by mass to 25% by mass, based on 100% by mass of the total amount of the solvent, from the viewpoints of the solubility of the (B) organic compound having a hydrophilic group and a carbon-affinity hydrophobic group, the thermal conductivity and heat dissipation of the resulting thermally and electrically conductive composition (thermal conductive material), and the like.

[0167] In the flaky carbon dispersion, the content of (A) flaky carbon is not particularly limited. From the viewpoint of successfully preparing the thermally and electrically conductive composition (thermal conductive material) of the present invention, the content is preferably adjusted to 20% by mass or less, more preferably adjusted to 0.0001% by mass to 15% by mass, and even more preferably adjusted to 0.001% by mass to 10% by mass, based on 100% by mass of the total amount of the flaky carbon dispersion.

[0168] The content of the (D) solvent in the thermally and electrically conductive composition is not particularly limited. From the viewpoint of successfully preparing the thermally and electrically conductive composition (thermal conductive material) of the present invention, the content is preferably adjusted to 40 to 99.9998 mass%, more preferably adjusted to 63 to 99.998 mass%, and even more preferably adjusted to 85 to 99.98 mass%, based on 100 mass% of the total amount of the flaky carbon dispersion.

[0169] The method for producing the flaky carbon dispersion liquid is not particularly limited. The method for producing the flaky carbon dispersion liquid can be achieved by adding (A) flaky carbon and (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group to (D) a solvent.

[0170] The method for producing a flaky carbon dispersion can also be to add (A) flaky carbon to a dispersion of (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group.The method for producing a flaky carbon dispersion can also be to add (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group to a dispersion of (A) flaky carbon.The method for producing a flaky carbon dispersion can also be to simultaneously add (A) flaky carbon and (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group to a (D) solvent.

[0171] <Grinding method (shearing treatment)> In order to further improve the dispersibility of the flaky carbon and make it less likely to agglomerate, and to further enhance the thermal conductivity and heat dissipation properties of the resulting thermally and electrically conductive composition (thermal conductive material) of the present invention, the method for producing a flaky carbon dispersion preferably involves placing a composition containing a carbonaceous material having a layered structure (the "carbonaceous material" being a material for producing flaky carbon, as described below) and (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group between a rotating turntable and a turntable placed approximately parallel to the turntable, and subjecting the carbonaceous material in the composition to a shearing treatment (grinding method) while adjusting the shortest distance between the turntable and the turntable to 200 μm or less.

[0172] By performing shearing treatment, the carbonaceous material having a layered structure is atomized, and therefore, the carbonaceous material having a layered structure can be efficiently flaked while maintaining the graphene structure, and the treatment time can be reduced.

[0173] The rotating disk and the disk are installed approximately parallel to each other during shearing, but do not have to be strictly parallel. The angle between an axis perpendicular to the rotating disk and an axis perpendicular to the disk is preferably 10° or less, more preferably 5° or less. The axis perpendicular to the rotating disk and the axis perpendicular to the disk are preferably strictly parallel.

[0174] The shortest distance between the two surfaces when shearing is not particularly limited as long as it is possible to sufficiently thin the carbonaceous material having a layered structure, and is preferably 200 μm or less, more preferably 1 μm to 50 μm, and even more preferably 2 μm to 30 μm.

[0175] The rotating disk and the disk are installed approximately parallel to each other, but the distance between the rotating disk and the disk may vary depending on the location. In this case, the shortest distance between the rotating disk and the disk means the shortest distance between the rotating disk and the disk.

[0176] It is not necessary to separate the turntables from the disks in advance; the material to be processed may be sandwiched between the turntables and the disks, or the turntables and the disks may be brought into contact with each other, and the gap between the turntables and the disks may widen as a result of the carbonaceous material having a layered structure being sandwiched between them.

[0177] The shearing treatment can be carried out using any device that can rotate a disk-like object, and is preferably carried out using a millstone, a vibration mixer, a spin coater, a grinder, or the like.

[0178] The sizes of the turntable and the disk that can be used are not particularly limited, and the sizes of the turntable and the disk are preferably 5 mm to 600 mm, and more preferably 10 mm to 400 mm.

[0179] The rotation speed of the rotating disk during shearing is not particularly limited, and is preferably adjusted within a range that allows sufficient exfoliation of the carbonaceous material having a layered structure, more preferably 1,000 ppm to 10,000 ppm, and even more preferably 1,500 ppm to 5,000 ppm.

[0180] By performing the shearing treatment, the plate and the carbonaceous material having a layered structure, and the carbonaceous material having a layered structure and the carbonaceous material having a layered structure can be brought into contact with each other, and shear can be applied to the carbonaceous material having a layered structure in a direction parallel to the graphene layers of the carbonaceous material having a layered structure.

[0181] By reducing the shortest distance between the rotating disks during shearing and increasing the rotation speed of the rotating disks, it is possible to make the conditions stronger, which allows the carbonaceous material having a layered structure to be flaked more efficiently and reduces the processing time. The shearing operation is preferably carried out one or more times, more preferably three or more times.

[0182] The temperature at which the shearing treatment is carried out is not particularly limited. The temperature at which the shearing treatment is carried out may be adjusted to a temperature at which the carbonaceous material having a layered structure can be sufficiently exfoliated, and is preferably adjusted to 0°C or higher, more preferably adjusted to 0°C to 100°C, and even more preferably adjusted to 20°C to 95°C. The temperature at which the shearing treatment is carried out is preferably under conditions that result in high solubility of (B) the organic compound having a hydrophilic group and a hydrophobic group that has high affinity with carbon, and in cases where a higher temperature increases solubility, a higher temperature is preferred. When a water-soluble compound having a cloud point is used, the temperature at which the shearing treatment is carried out is preferably maintained at a temperature below the cloud point.

[0183] In order to bring the carbonaceous material having a layered structure and (B) the organic compound having a hydrophilic group and a hydrophobic group that has a high affinity for carbon into good contact before the shearing treatment, a stirring device, an ultrasonic dispersing device, or the like may be used to stir the material in advance before preparing the thermally and electrically conductive composition, thereby allowing (B) the organic compound having a hydrophilic group and a hydrophobic group that has a high affinity for carbon to become familiar with the surface of the carbonaceous material having a layered structure.

[0184] When graphite oxide is used as the carbonaceous material having a layer structure, it exists as an oxide of flaky carbon in the dispersion that has been subjected to shear treatment. When graphite oxide is used as the carbonaceous material having a layer structure, it is preferably subjected to a reduction treatment as a post-treatment.

[0185] The reduction treatment can be carried out by various methods such as chemical reduction and electrochemical reduction, and is preferably carried out by chemical reduction using a reducing agent such as hydrazine or sodium borohydride.

[0186] The amount of the reducing agent is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, and even more preferably 0.5 to 3 parts by mass per 1 part by mass of (A) flaky carbon oxide.

[0187] Heating during reduction facilitates reduction. The heating temperature is preferably adjusted to 40° C. to 200° C., more preferably adjusted to 50° C. to 150° C., and even more preferably adjusted to 60° C. to 120° C. The heating temperature is adjusted to a level that does not excessively destroy the graphene structure.

[0188] The reduction time is adjusted to preferably 10 minutes to 64 hours, more preferably 30 minutes to 48 hours, and even more preferably 1 hour to 24 hours, so that the graphene structure is not excessively destroyed.

[0189] By using a method for producing a flaky carbon dispersion, (A) flaky carbon is obtained as a flaky carbon dispersion. In this production method, the flaky carbon dispersion contains (B) an organic compound having a hydrophilic group and a hydrophobic group that has a high affinity for carbon, and therefore the flaky carbon dispersion also contains (B) an organic compound having a hydrophilic group and a hydrophobic group that has a high affinity for carbon.

[0190] (B) Organic compounds having hydrophilic groups and hydrophobic groups with high affinity for carbon can adsorb onto the surface of (A) flaky carbon and disperse (A) flaky carbon at high concentrations in (D) solvents, and therefore also function as dispersants in flaky carbon dispersions.

[0191] (B) Organic compounds having hydrophilic groups and hydrophobic groups with high affinity for carbon can be commercially available products, and are superior to conventional products in both cost and dispersibility. (B) Organic compounds having hydrophilic groups and hydrophobic groups with high affinity for carbon remain on the surface of the flaky carbon, allowing the thermally and electrically conductive composition to exhibit sufficient thermal conductivity and heat dissipation.

[0192] In conventional methods involving oxidation and reduction treatment, it was impossible to form a flaky carbon dispersion on a plastic substrate because the plastic substrate was hydrolyzed during the reduction treatment and the flaky carbon aggregated when the reduction treatment was performed, preventing it from existing as a dispersion.

[0193] In the present invention, by incorporating (B) an organic compound having a hydrophilic group and a hydrophobic group that has a high affinity for carbon, and performing a specific treatment, it is also possible to form a flaky carbon dispersion on a plastic substrate such as polyethylene terephthalate (PET) without the substrate being hydrolyzed.

[0194] <High-pressure dispersion method (pressure treatment)> As a method for producing a flaky carbon dispersion, the flaky carbon dispersion can also be produced by subjecting a composition containing a carbonaceous material having a layered structure and (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group to a pressure treatment of 30 MPa or more (high-pressure dispersion method).

[0195] When the high-pressure dispersion method is employed, a composition containing a carbonaceous material having a layered structure and (B) an organic compound having a hydrophilic group and a hydrophobic group having a high affinity for carbon is preferably subjected to a pressure treatment of 30 MPa or more.

[0196] By applying pressure treatment, the carbonaceous material having a layered structure is atomized, so that the carbonaceous material having a layered structure can be efficiently flaked while maintaining the graphene structure, and the treatment time can be reduced.

[0197] The pressure level when carrying out the pressure treatment is not particularly limited as long as it can sufficiently exfoliate the carbonaceous material having a layered structure. The pressure level is preferably adjusted to 30 MPa or more, more preferably adjusted to 50 MPa to 400 MPa, and even more preferably adjusted to 100 MPa to 300 MPa. The pressure treatment is preferably carried out using a high-pressure dispersion device, a supercritical water production device, or the like. The high-pressure dispersion device can disperse (A) flaky carbon by applying mechanical pressure. The supercritical water production device can increase the pressure of the system by heating water.

[0198] By applying pressure, for example, (i) causing two or more of the carbonaceous material dispersions to collide with each other; (ii) colliding the carbonaceous material dispersion with a metal or ceramic material (a high-hardness material such as silicon carbide or alumina); (iii) The carbonaceous material dispersion is formed into a film having a cross-sectional area of ​​1 cm 2 Passing through the following spaces Processing such as the above is performed.

[0199] According to (i) and (ii), it is possible to make the pressure conditions stronger, so that the carbonaceous material having a layered structure can be more efficiently exfoliated, and the processing time can be further reduced.

[0200] According to (iii), it is possible to more appropriately exfoliate a carbonaceous material having a layered structure while maintaining the graphene structure.

[0201] The pressurization operation is preferably carried out once or more, more preferably ten or more times.

[0202] The pressing temperature is not particularly limited. The pressing temperature is adjusted to a temperature at which the carbonaceous material having a layered structure can be sufficiently exfoliated. In the cases of (i) and (ii), the pressing temperature is preferably adjusted to 0°C to 100°C, more preferably 20°C to 95°C. In the case of (iii), when pressure is applied mechanically, the temperature is preferably adjusted to 0°C to 100°C. In the case of (iii), when pressure is generated by the supercritical state of water, the temperature is preferably adjusted to 373°C to 700°C, more preferably 380°C to 450°C.

[0203] When the pressure treatment is carried out, it is preferable to carry out an ultrasonic dispersion treatment as a preliminary treatment (pretreatment) to atomize the carbonaceous material having a layered structure, which can have the effect of preventing clogging in a high-pressure dispersion device, a supercritical water production device, etc.

[0204] The output power during ultrasonic dispersion treatment is not particularly limited. From the viewpoint of flaking the carbonaceous material having a layered structure, the output power during ultrasonic dispersion treatment is preferably adjusted to be stronger than that of a commonly performed ultrasonic dispersion treatment (about 40 W to 50 W). The output power during ultrasonic dispersion treatment is preferably adjusted to 100 W or more, more preferably adjusted to 300 W to 20,000 W, and even more preferably adjusted to 400 W to 18,000 W.

[0205] The ultrasonic dispersion temperature is not particularly limited. The ultrasonic dispersion temperature is preferably adjusted to a temperature at which the carbonaceous material having a layered structure can be sufficiently exfoliated. The ultrasonic dispersion temperature is preferably adjusted to 0°C to 80°C, more preferably 10°C to 70°C.

[0206] The ultrasonic dispersion time is not particularly limited. The ultrasonic dispersion time is preferably adjusted to a time that allows sufficient exfoliation of the carbonaceous material having a layered structure. The ultrasonic dispersion time is preferably adjusted to 1 minute to 600 minutes, more preferably 3 minutes to 120 minutes.

[0207] As a pre-treatment or post-treatment of these treatments, dispersion treatment using other dispersion devices such as ordinary mechanical stirring, dispersion treatment using an emulsifying device, dispersion treatment using a bead mill, etc. In this case, from the viewpoint of pulverizing large particles, a higher rotation speed is preferred within the range that ensures safety.

[0208] In the present invention, when graphite oxide is used as the carbonaceous material having a layer structure, it exists as an oxide of flaky carbon in the dispersion that has been subjected to the pressure treatment. Therefore, when graphite oxide is used as the carbonaceous material having a layer structure, it is preferable to perform a reduction treatment as a post-treatment.

[0209] The reduction treatment can be carried out by various methods such as chemical reduction and electrochemical reduction, and is preferably carried out by chemical reduction using a reducing agent such as hydrazine or sodium borohydride.

[0210] The amount of the reducing agent is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, and even more preferably 0.5 to 3 parts by mass per 1 part by mass of (A) flaky carbon oxide.

[0211] Heating during reduction facilitates reduction. The heating temperature is preferably adjusted to 40° C. to 200° C., more preferably adjusted to 50° C. to 150° C., and even more preferably adjusted to 60° C. to 120° C. The heating temperature is set to a level that does not excessively destroy the graphene structure.

[0212] The reduction time is preferably adjusted to 10 minutes to 64 hours, more preferably adjusted to 30 minutes to 48 hours, and even more preferably adjusted to 1 hour to 24 hours. The reduction time is set to a length that does not excessively destroy the graphene structure.

[0213] Method for producing flaky carbon dispersion The most preferred method for producing the flaky carbon dispersion is the grinding method, from the viewpoint of the thermal conductivity and heat dissipation of the resulting thermally and electrically conductive composition of the present invention.

[0214] Conventionally, when producing flaky carbon by a wet method, a water dispersion containing flaky carbon oxide and an aqueous solvent is subjected to a reduction treatment. With this conventional method, it is difficult to maintain the graphene structure, and the resulting flaky carbon aggregates severely, making it difficult to obtain a flaky carbon water dispersion. The conventional method also poses safety problems.

[0215] Conventional methods can obtain a flaky carbon aqueous dispersion when high-pressure treatment is performed, but the resulting flaky carbon is easily destroyed, production tends to take a long time, and clumps that fail to peel off may remain.

[0216] The method for producing a flaky carbon dispersion of the present invention uses (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group, thereby obtaining flaky carbon in a uniformly dispersed state (flaky carbon dispersion) without aggregation of (A) flaky carbon that maintains the graphene structure. The method for producing a flaky carbon dispersion of the present invention makes it possible to obtain flaky carbon in a short period of time, with the flaky carbon being less likely to be destroyed. The method for producing a flaky carbon dispersion of the present invention also makes it less likely that clumps that have not been peeled off remain. In the method for producing a flaky carbon dispersion of the present invention, (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group can also function as a dispersant for uniformly dispersing the flaky carbon.

[0217] The content of the (B) organic compound having a hydrophilic group and a carbon affinity hydrophobic group is not particularly limited. For the reason that the thermally and electrically conductive composition (thermal conductive material) can be easily prepared, the content of the (B) organic compound having a hydrophilic group and a carbon affinity hydrophobic group is preferably adjusted to 0.00001 to 99.9% by mass, more preferably 0.0001 to 50% by mass, and even more preferably 0.001 to 30% by mass, based on 100% by mass of the total amount of the (A) flaky carbon dispersion.

[0218] The content of the (B) organic compound having a hydrophilic group and a carbon affinity hydrophobic group in the flaky carbon dispersion is not particularly limited. The content of the (B) organic compound having a hydrophilic group and a carbon affinity hydrophobic group in the flaky carbon dispersion is preferably adjusted to 1 to 100 parts by mass, more preferably 2 to 80 parts by mass, per 100 parts by mass of the (A) flaky carbon, for the reason that it is easy to adjust the thermally and electrically conductive composition (thermal conductive material).

[0219] The lower the content of the (B) organic compound having a hydrophilic group and a carbon-affinity hydrophobic group, the higher the content of the carbonaceous material having a layered structure, which tends to improve thermal conductivity and heat dissipation and makes processing easier and less expensive. On the other hand, the higher the content of the (B) organic compound having a hydrophilic group and a carbon-affinity hydrophobic group, the more likely exfoliation (delamination) occurs, which tends to result in more efficient production of flaky carbon. If the content of the (B) organic compound having a hydrophilic group and a carbon-affinity hydrophobic group is too low, the viscosity may increase and the exfoliation efficiency may decrease.

[0220] The content of (B) the organic compound having a hydrophilic group and a carbon-affinity hydrophobic group is set appropriately from the viewpoint of the balance between thermal conductivity, heat dissipation, cost, exfoliation efficiency, etc. When a carbonaceous material dispersion is used in the method for producing a flaky carbon dispersion, the content of (B) the organic compound having a hydrophilic group and a carbon-affinity hydrophobic group in the carbonaceous material dispersion is set within the above range.

[0221] The method for producing a flaky carbon dispersion liquid employs a shearing method, so that the direction of force application is parallel to the surface direction of the carbonaceous material having a layered structure, and processing is performed in a narrow space, resulting in less destruction and larger-sized flaky carbon (for example, flaky carbon with a size of 1 μm or more) compared to conventional production methods that rely on high-speed stirring, ultrasonic treatment, high-pressure treatment, etc. The method for producing a flaky carbon dispersion liquid employs a shearing method, which results in efficient peeling, allows processing in a short time (few passes), and is less likely to leave thick clumps that were not peeled off.

[0222] The carbonaceous material having a layer structure is not particularly limited, and is preferably natural graphite, artificial graphite, expanded graphite, amorphous graphite, graphite oxide, or the like.

[0223] The oxidized graphite is preferably graphite oxidized with one or more oxidizing agents such as sulfuric acid, nitric acid, potassium permanganate, hydrogen peroxide, etc. When oxidized graphite is obtained by the Hummers method, graphite is immersed in concentrated sulfuric acid, potassium permanganate is added to oxidize the graphite, and the reaction product is quenched with dilute sulfuric acid and / or hydrogen peroxide, and then washed with distilled water, whereby oxygen atoms are bonded to carbon atoms and introduced between layers, thereby obtaining oxidized graphite.

[0224] When it is desired to obtain high-purity flaky carbon that does not contain heteroatoms such as oxygen, graphite is preferably used as the raw material, and natural graphite and expanded graphite are more preferably used.

[0225] When using expanded graphite, it is preferable to use expanded graphite with less oxidation of the graphene structure. When using expanded graphite, it may be heat-treated at about 300°C to 1,000°C for about 10 seconds to 5 hours before use. This makes it possible to obtain expanded graphite that has been appropriately expanded.

[0226] When ease of production is important, graphite oxide may be used. By using graphite oxide, solvent molecules can be easily inserted between the layers, making it easy to exfoliate only in the layer direction, improving the exfoliation efficiency and dispersibility, and making it possible to shorten the processing time. When graphite oxide is used, a subsequent reduction treatment is required.

[0227] From the viewpoint of further maintaining the graphene structure, electrical conductivity, and strength, materials other than graphite oxide (natural graphite, artificial graphite, expanded graphite, amorphous graphite) are preferred.

[0228] In the method for producing a flaky carbon dispersion, amorphous graphite can also be used to further improve dispersibility.

[0229] From the viewpoints of crystallinity, purity and structural maintenance, materials other than amorphous graphite (natural graphite, artificial graphite, expanded graphite, graphite oxide) are preferred.

[0230] When emphasis is placed on the crystallinity, strength, structural integrity, etc. of the resulting flaky carbon, artificial graphite can also be used.

[0231] In the present invention, when a shearing treatment is performed between a rotating rotating disk and a disk placed approximately parallel to the rotating disk, with the shortest distance between the two surfaces maintained at 200 μm or less, the content of the carbonaceous material having a layered structure in the system is not particularly limited. The content of the carbonaceous material having a layered structure is adjusted to preferably 20% by mass or less, more preferably 0.0001% by mass to 15% by mass, and even more preferably 0.001% by mass to 10% by mass, based on 100% by mass of the total amount of the composition used to produce the flaky carbon dispersion.

[0232] The thinner the content of the carbonaceous material having a layered structure, the more easily flaking (delamination) occurs, which tends to result in more efficient production of flaky carbon and fewer treatments, and also tends to make it easier to maintain appropriate viscosity and perform shearing treatments, etc.

[0233] The higher the content of the carbonaceous material having a layered structure, the better the productivity. The content of the carbonaceous material having a layered structure is appropriately set from the viewpoint of the balance of exfoliation efficiency, viscosity, productivity, etc. When a carbonaceous material dispersion is used, the content of the carbonaceous material having a layered structure in the flaky carbon dispersion is set within the above range.

[0234] When producing a flaky carbon dispersion, it is preferable to subject a carbonaceous material having a layered structure to a specific treatment in the coexistence of (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group. In terms of the exfoliation efficiency of the carbonaceous material having a layered structure, the thermal conductivity and heat dissipation properties of the resulting flaky carbon, etc., the method for producing a flaky carbon dispersion preferably subjects a carbonaceous material dispersion containing a carbonaceous material having a layered structure and (B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group to a specific treatment.

[0235] (D) The solvent may be any of the solvents described above. The solvent used to prepare the carbonaceous material dispersion (carbonaceous material dispersion liquid, or carbonaceous material coating film) may be any of the solvents described above.

[0236] In the present invention, when a specific treatment is performed using a carbonaceous material dispersion liquid containing a solvent, the total amount of solvent in the carbonaceous material dispersion liquid is not particularly limited. From the viewpoints of the exfoliation efficiency of the carbonaceous material having a layered structure, the solubility of the (B) organic compound having a hydrophilic group and a carbon-affinitive hydrophobic group, and the like, the total amount of solvent in the carbonaceous material dispersion liquid is adjusted to preferably 40% to 99.9998% by mass, more preferably 63% to 99.998% by mass, and even more preferably 85% to 99.98% by mass, based on 100% by mass of the total amount of the carbonaceous material dispersion liquid.

[0237] In the present invention, when a specific treatment is performed using a carbonaceous material dispersion using a solvent, the carbonaceous material dispersion may be prepared by adding a carbonaceous material having a layered structure to a dispersion of an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group (B), or by adding an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group (B) to a dispersion of a carbonaceous material having a layered structure. Alternatively, the carbonaceous material having a layered structure and the organic compound having a hydrophilic group and a carbon-affinity hydrophobic group may be simultaneously added to a solvent.

[0238] (2-2)(C) Method of adding swelling clay minerals The (C) swelling clay mineral may be added in powder form to the (D) solvent or the (A) dispersion of flaky carbon. Preferably, the (C) swelling clay mineral is dispersed in the (D) solvent beforehand, and then added to the (D) solvent or the dispersion of flaky carbon.

[0239] (C) When the swelling clay mineral is added to a solvent or a dispersion of flaky carbon, if the swelling clay mineral is highly dispersible, it can be dispersed by ordinary stirring.

[0240] (C) When adding the swelling clay mineral to a solvent or a dispersion of flaky carbon, if the dispersibility is not high or if rapid dispersion is desired, a high-shear dispersion method is preferably employed, and more preferably, a homogenizer, high-pressure dispersion device, ultrasonic dispersion device, bead mill, wet grinder, etc. is employed.

[0241] In the present invention, other components may be added to the composition containing the carbonaceous material having a layered structure, (B) an organic compound having a hydrophilic group and a hydrophobic group having a high affinity for carbon, and (C) an expandable clay mineral. This allows these other components to be added to the final (A) flaky carbon dispersion and thermally and electrically conductive composition (thermal conductive material). The above-mentioned components may be used as such other components, and they may be used within a range that does not impair the effects of the present invention.

[0242] (D) From the viewpoint of easily obtaining a thermally and electrically conductive composition (thermally conductive material) that is easily dispersed in a solvent and that further improves the uniformity and adhesion of a coating film when applied, the content of other components is preferably small, and is preferably 0.00001% by mass to 5% by mass, and more preferably 0.0001% by mass to 2% by mass, relative to 100% by mass of the total amount of the carbonaceous material dispersion.

[0243] The present invention makes it possible to produce a heat-resistant coating film with excellent thermal conductivity, electrical conductivity, etc., by using a specific organic compound, flaky carbon having a specific thickness, and an expandable clay mineral.

[0244] The present invention can be implemented in various forms without departing from the gist of the present invention. [Example]

[0245] The present invention will be specifically described below with reference to examples.

[0246] The present invention is not limited to the following specific examples.

[0247] Example 1 1 kg of natural graphite (manufactured by Ito Graphite Industries Co., Ltd.), 0.1 kg of polyoxyethylene naphthyl ether ((B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group), and 18.9 kg of water ((D) solvent) were mixed, and the mixture was processed five times in a ceramic grinder to obtain a dispersion containing flaky carbon ((A) flaky carbon with a thickness of 1 nm to 100 nm). The obtained dispersion of flaky carbon had a solids content of 5.5 wt %, of which the carbon content was 5.0 mass %.

[0248] A 5.0 wt % dispersion of smectite was prepared by mixing 50 g of smectite (manufactured by Co-op Chemical) ((C) swelling clay mineral) with 950 g of distilled water ((D) solvent).

[0249] 8 g of the dispersion containing flaky carbon and 2 g of the dispersion containing smectite were mixed.

[0250] This mixed solution was applied to glass and dried at room temperature to obtain a blackish gray coating film.

[0251] The surface resistivity of this coating was 16 Ω / □.

[0252] When this coating was rubbed with a load of approximately 500 g, no peeling occurred.

[0253] When this coating film was baked at 350°C, there was no change in its condition and the surface resistivity was 13 Ω / □.

[0254] When the coating film baked at 350°C was rubbed under the above conditions, no peeling occurred.

[0255] Example 2 1 kg of natural graphite (manufactured by Ito Graphite Industries Co., Ltd.), 0.1 kg of polyoxyethylene naphthyl ether ((B) an organic compound having a hydrophilic group and a carbon-affinity hydrophobic group), and 18.9 kg of water ((D) solvent) were mixed, and the mixture was processed five times in a ceramic grinder to obtain a dispersion containing flaky carbon ((A) flaky carbon with a thickness of 1 nm to 100 nm). The obtained dispersion of flaky carbon had a solids content of 5.5 wt %, of which the carbon content was 5.0 mass %.

[0256] A 5.0 wt % dispersion of smectite was prepared by mixing 50 g of smectite (manufactured by Co-op Chemical) ((C) swelling clay mineral) with 950 g of distilled water ((D) solvent).

[0257] 8 g of the dispersion containing flaky carbon and 4 g of the dispersion containing smectite were mixed.

[0258] This mixed solution was applied to glass and dried at room temperature to obtain a blackish gray coating film.

[0259] The surface resistivity of this coating was 34 Ω / □.

[0260] When this coating was rubbed with a load of approximately 500 g, no peeling occurred.

[0261] When this coating film was baked at 350°C, there was no change in its condition and the surface resistivity was 29 Ω / □.

[0262] When the coating film baked at 350°C was rubbed under the above conditions, no peeling occurred.

[0263] (Comparative Example 1, Example not containing (C) swelling clay mineral) 1 kg of natural graphite (manufactured by Ito Graphite Industries Co., Ltd.), 0.1 kg of polyoxyethylene naphthyl ether, and 18.9 kg of water were mixed, and the mixture was processed five times in a ceramic grinder to obtain a dispersion containing flaky carbon. The obtained dispersion of flaky carbon had a solid content of 5.5 wt % and a carbon content of 5.0 mass %.

[0264] This dispersion was applied to glass and dried at 100°C to obtain a blackish-gray coating film.

[0265] The surface resistivity of this coating was 9 Ω / □.

[0266] When this coating was rubbed with a load of approximately 500 g, some peeling occurred.

[0267] When this coating film was baked at 400°C, there was no change in its condition and the surface resistivity was 8 Ω / □.

[0268] When the coating film baked at 400°C was rubbed under the above conditions, peeling occurred.

[0269] (Comparative Example 2, Example not containing (C) swelling clay mineral) 1 kg of natural graphite (manufactured by Ito Graphite Industries Co., Ltd.), 0.1 kg of polyoxyethylene naphthyl ether, and 18.9 kg of water were mixed, and the mixture was processed five times in a ceramic grinder to obtain a dispersion containing flaky carbon. The obtained dispersion of flaky carbon had a solid content of 5.5 wt % and a carbon content of 5.0 mass %.

[0270] A 20 wt % aqueous polyimide dispersion (DSP, manufactured by Gokyo Food & Chemical Co., Ltd.) was prepared and diluted four times.

[0271] 8 g of the dispersion containing flaky carbon and 2 g of the dispersion containing polyimide were mixed.

[0272] This mixed solution was applied to glass and dried at room temperature to obtain a blackish gray coating film.

[0273] The surface resistivity of this coating was 216 Ω / □.

[0274] When this coating was rubbed with a load of approximately 500 g, peeling occurred.

[0275] When this coating film was baked at 350°C, there was no change in its condition and the surface resistivity was 39 Ω / □.

[0276] When the coating film baked at 350°C was rubbed under the above conditions, slight peeling occurred.

[0277] This coating film had a higher resistivity than the coating film of Example 1.

[0278] [Industrial Applicability] The present invention makes it possible to produce a heat-resistant coating film with excellent thermal conductivity, electrical conductivity, etc., by using a specific organic compound, flaky carbon having a specific thickness, and an expandable clay mineral.

Claims

1. 1. A thermally and electrically conductive composition comprising: (A) Thin flake carbon with a thickness of 1 nm to 100 nm; (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (C) a swelling clay mineral; A thermally and electrically conductive composition comprising:

2. 2. The thermally and electrically conductive composition according to claim 1, wherein the hydrophilic group of the organic compound (B) is at least one hydrophilic group selected from the group consisting of the following general formulas (1) to (4): 【Chemical 1】 [Formula (1) represents an alcoholic hydroxyl group or a phenolic hydroxyl group. In formula (2), R represents a divalent organic group, and both oxygen atoms represent ether bonds. In formula (3), X 1 is a hydrogen atom, an alkali metal, NH 4 , or organic ammonium. In formula (4), X 2 is a hydrogen atom, an alkali metal, NH 4 , an organic ammonium group, or an alkyl group.

3. 2. The thermally and electrically conductive composition according to claim 1, wherein the hydrophilic group of the organic compound (B) is a phenolic hydroxyl group or a polyoxyethylene group.

4. 2. The thermally and electrically conductive composition according to claim 1, wherein the carbon-affinity hydrophobic group of the organic compound (B) is at least one carbon-affinity hydrophobic group selected from the group consisting of an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, and a polyoxyalkylene group having 3 or more carbon atoms.

5. 2. The thermally and electrically conductive composition according to claim 1, wherein the carbon-philic hydrophobic group of the organic compound (B) is an aryl group having two or more aromatic rings.

6. 2. The thermally and electrically conductive composition according to claim 1, wherein the (C) swelling clay mineral is smectite.

7. 2. The thermally and electrically conductive composition according to claim 1, wherein the (C) swelling clay mineral is at least one smectite selected from the group consisting of montmorillonite, beidellite, nontronite, saponite, hectorite, sauconite, and stevensite.

8. 2. The thermally and electrically conductive composition according to claim 1, wherein the (C) swelling clay mineral is hectorite.

9. 2. The thermally and electrically conductive composition according to claim 1, wherein the (C) swelling clay mineral is water-dispersible.

10. In the composition, The content ratio of the (A) flaky carbon and the (C) swelling clay compound is (A) Flake carbon: per 1 mass (C) swelling clay compound: 0.1 mass to 1 mass ratio; 10. The thermally and electrically conductive composition of claim 1.

11. A thermally and electrically conductive paint, (A) Thin flake carbon with a thickness of 1 nm to 100 nm; (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (C) a swelling clay mineral; (D) a solvent; A thermally and electrically conductive paint containing

12. the (D) solvent contains water and an organic solvent; The ratio of water in the solvent is 20% by mass to 95% by mass. The thermally and electrically conductive paint according to claim 11.

13. In the paint, The total content of the (A) flaky carbon and the (C) swelling clay compound is 0.1% to 6% by weight, The thermally and electrically conductive paint according to claim 11.

14. A paint containing the thermally and electrically conductive composition according to any one of claims 1 to 10, or The thermally and electrically conductive paint according to any one of claims 11 to 13. A coating film formed by the above.

15. A method for producing a thermally and electrically conductive paint, (1) A method for producing a swellable clay mineral, comprising: (A) mixing a dispersion containing 1% by mass to 10% by mass of flaky carbon having a thickness of 1 nm to 100 nm with (C) a dispersion containing 0.1% by mass to 10% by mass of the swellable clay mineral; (B) an organic compound having a hydrophilic group and a carbon-philic hydrophobic group; (D) a solvent; A manufacturing method for thermally and electrically conductive paint.

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