Coating film, component for heating cooker, and coating

Abstract

The present invention makes it possible to provide a coating film formed on a substrate, the coating film containing an aromatic polyether ketone and an organosilicon compound having a siloxane bond, and having excellent non-stick properties.

Description

Coating film, parts for a cooking appliance, and paint

[0001] The present disclosure relates to a coating film, parts for a cooking appliance having the coating film, and a paint for forming the coating film.

[0002] Conventionally, a fluororesin coating has been used for coating the surface of a cooking appliance that comes into contact with food (Patent Document 1). On the other hand, in order to improve the adhesion between the fluororesin coating and the substrate, a highly durable aromatic polyether ketone may be formed between the fluororesin coating and the substrate (Patent Document 2). Further, since the aromatic polyether ketone coating film does not have high non-stickiness compared to the fluororesin film, fluorine may be added when non-stickiness is required (Patent Document 3).

[0003] JP-A-2013-27875 JP-A-2013-255647 JP-A-2024-49380

[0004] Based on the above background, a novel coating film with high non-stickiness to articles (e.g., food) on the coating is desired.

[0005] An object of the present disclosure is to provide a novel coating film having excellent non-stickiness.

[0006] The present disclosure includes the following embodiments: [Clause 1] A coating film formed on a substrate, wherein the coating film comprises an aromatic polyether ketone and an organosilicon compound having a siloxane bond. [Clause 2] The coating film according to Claim 1, wherein the aromatic polyether ketone is a polyether ether ketone. [Clause 3] The coating film according to Claim 1 or Claim 2, wherein the organosilicon compound is a compound represented by the following formula: (R13)3Si-O-[-Si(R11)2-O-]a-Si(R13)3 [wherein R11 independently represents an alkyl group having 1 to 12 carbon atoms, R13 independently represents an alkyl group having 1 to 12 carbon atoms, and a is an integer from 3 to 2000.] [Clause 4] The coating film according to Claim 3, wherein R11 and R13 are methyl groups. [Clause 5] The coating film according to any one of Clauses 1 to 4, comprising two or more coating layers including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, wherein the content of the organosilicon compound in the first coating layer is less than the content of the organosilicon compound in the second coating layer. [Clause 6] The coating film according to any one of Clauses 1 to 5, comprising two or more coating layers including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, wherein the color of a part of the second coating layer is different from the color of the layer beneath the second coating layer. [Clause 7] The coating film according to any one of Clauses 1 to 6, comprising two or more coating layers including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, wherein the first coating layer contains carbon black. [Clause 8] The coating film comprises two or more coating layers, including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, wherein the color of the substrate and / or a part of the first coating layer is different from the color of the other part of the substrate and / or the first coating layer, according to any one of claims 1 to 7. [Clause 9] The coating film according to any one of claims 1 to 8, having a concentration gradient of the organosilicon compound that increases in the thickness direction from the substrate side to the surface. [Clause 10] The coating film according to any one of claims 1 to 9, wherein the content of the perfluoroalkyl compound and the polyfluoroalkyl compound is 1% by mass or less.[Claim 11] A coating film according to any one of claims 1 to 10, wherein the content of fluorine atoms in the coating film is 1% by mass or less. [Claim 12] A coating film according to any one of claims 1 to 11, wherein the surface roughness (Ra) is 1 μm or less. [Claim 13] A coating film according to any one of claims 1 to 11, wherein the surface roughness (Ra) is 10 μm or more. [Claim 14] A coating film according to any one of claims 1 to 13, wherein the thickness is 5 to 100 μm. [Claim 15] A coating film according to any one of claims 1 to 14, further comprising at least one selected from the group consisting of diamond powder and silicon carbide. [Claim 16] A cooking appliance component comprising a coating film according to any one of claims 1 to 15. [Claim 17] A paint comprising an aromatic polyether ketone and an organosilicon compound having a siloxane bond. [Claim 18] A paint according to claim 17, comprising a surfactant.

[0007] According to this disclosure, a coating film having excellent non-stick properties can be provided.

[0008] Figure 1 is a schematic cross-sectional view of a laminate 1 including the coating film 12 of the present disclosure according to the first embodiment. Figure 2 is a schematic cross-sectional view of a laminate 2 including the coating film 12 of the present disclosure according to the second embodiment. Figure 3A is a schematic cross-sectional view of a laminate 3 including the coating film 12 of the present disclosure according to the third embodiment. Figure 3B is a schematic cross-sectional view of a laminate 3 including the coating film 12 of the present disclosure according to the third embodiment. Figure 4 is a schematic cross-sectional view of a laminate 4 including the coating film 12 of the present disclosure according to the fourth embodiment. Figure 5A is a schematic cross-sectional view of a laminate 5 including the coating film 12 of the present disclosure according to the fifth embodiment. Figure 5B is a schematic cross-sectional view of a laminate 5 including the coating film 12 of the present disclosure according to the fifth embodiment. Figure 5C is a schematic cross-sectional view of a laminate 5 including the coating film 12 of the present disclosure according to the fifth embodiment.

[0009] According to a first embodiment of the present disclosure, a coating film laminated on a substrate is provided, wherein the coating film contains an aromatic polyether ketone and an organosilicon compound having a siloxane bond.

[0010] [First Embodiment] A coating film according to the first embodiment of this disclosure will be described below with reference to the attached drawings. Figure 1 is a schematic cross-sectional view showing a cross-section of the coating film 12 of this disclosure formed on a substrate 11. As shown in Figure 1, the substrate 11 and the coating film 12 laminated on the substrate 11 constitute a laminate 1.

[0011] (Base material) The type of base material 11 is not particularly limited as long as it has high heat resistance, and may be a material containing one or more of various materials such as aluminum, iron, copper, stainless steel, ceramic, composite materials of various metals, clad materials, or plating. As a component for a heating cooker, it is preferable to have an aluminum film from the viewpoint of thermal conductivity.

[0012] The substrate 11 may have a coating layer. The coating layer may be, for example, titanium, diamond, or a high heat-resistant engineering plastic (e.g., polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polyethersulfone (PES), thermoactive polyimide (TPI), polyamide-imide (PAI), etc.). The thickness of the coating layer is not particularly limited, but is, for example, in the range of 1 to 200 μm, preferably 5 to 50 μm, and more preferably 10 to 30 μm.

[0013] Preferably, the substrate 11 and the coating layer do not contain perfluoroalkyl compounds and polyfluoroalkyl compounds. In this specification, perfluoroalkyl compounds and polyfluoroalkyl compounds (hereinafter also referred to as PFAS) are substances that include at least one of the following three substructures: (a) Ra1-(CF2)-CF(Ra2)Ra3 (b) Rb1-CF2-O-CF2-Rb2 (c) CF3-C(CF3)Rc1Rc2 [wherein Ra1, Ra2 and Ra3 are each independently carbon atoms without unsaturated bonds, Rb1 and Rb2 are each independently carbon atoms, fluorine atoms or oxygen atoms without unsaturated bonds, and Rc1 and Rc2 are each independently carbon atoms or fluorine atoms without unsaturated bonds. The above definition of PFAS is in accordance with Instructions for Reporting PFAS Under TSCA Section 8(a)(7), US Environmental Protection Agency, Office of Pollution Prevention and Toxics, October 2023, EPA-705-G-2023-3727. Examples of PFAS include perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorohexanesulfonic acid (PFHxS), and polytetrafluoroethylene (PTFE).

[0014] The shape of the substrate is not particularly limited and may be, for example, plate-shaped, film-shaped, dish-shaped, bowl-shaped, or other forms. Furthermore, the surface area of ​​the substrate on which the coating film is to be formed only needs to be at least a part of the substrate surface and can be appropriately determined according to the intended use and specific specifications of the article to be manufactured.

[0015] (Coating film) The coating film 12 is formed on the substrate 11.

[0016] (Aromatic polyether ketone) The coating film 12 contains an aromatic polyether ketone.

[0017] Aromatic polyether ketones are a general term for polymer compounds having a linear structure in which benzene rings are linked by oxygen atoms and / or carbonyl groups, and are generally represented by the following formula: -[-Bz-X-]n- [wherein Bz is a benzene ring, X is independently -O- or -C(=O)-, and n is an integer from 2 to 10000].

[0018] Specific examples of aromatic polyether ketones include polyether ether ketone (PEEK, formula I below), polyether ketone (PEK, formula II below), polyether ketone ketone (PEKK, formula III below), and polyether ether ketone ketone (PEEKK, formula IV below).

[0019] In the above equations I to IV, n is an integer between 2 and 10000.

[0020] The aromatic polyetherketone contained in the coating film of this disclosure may have only one of the repeating structures represented by formulas I to IV, or it may have two or more, but it is preferable to have only one. This is because having a regular repeating structure throughout the entire molecule of the aromatic polyetherketone increases its crystallinity and improves its heat resistance. In particular, from the viewpoint of heat resistance and other factors, the aromatic polyetherketone of this disclosure is preferably a polyetheretherketone (PEEK) having only the repeating structure represented by formula I.

[0021] The bond position of the -O- or -C(=O)- attached to each benzene ring in the aromatic polyether ketone can be any of the ortho, meta, or para positions, but the para position is preferred from the viewpoint of increasing the molecular crystallinity and potentially improving the heat resistance of the coating film.

[0022] Each phenylene group in the aromatic polyether ketone may be substituted with a monovalent group, such as a C1-6 alkyl group or a halogen atom, but it is preferable that it be unsubstituted (i.e., bonded only to hydrogen atoms) from the viewpoint of increasing the molecular crystallinity and improving the heat resistance of the coating film.

[0023] The type of terminal group of an aromatic polyether ketone is not particularly limited as long as it is a substituent to which the molecule can be stably bonded, and may be, for example, a hydrogen atom, a C1-6 alkyl group, a hydroxyl group, a halogen atom, a hydrogen atom, an amino group, a carboxyl group, a C1-6 alkoxy group, etc.

[0024] Furthermore, the number-average molecular weight of the aromatic polyetherketone may be 1,000 or more, 3,000 or more, 5,000 or more, 10,000 or more, 20,000 or more, 30,000 or more, 50,000 or more, 70,000 or more, 100,000 or more, 150,000 or more, 200,000 or more, or 300,000 or more. From the viewpoint of heat resistance, etc., the number-average molecular weight of the aromatic polyetherketone is preferably 5,000 or more, and more preferably 10,000 or more. Furthermore, the number-average molecular weight of the aromatic polyetherketone may be 500,000 or less, 300,000 or less, 200,000 or less, 100,000 or less, or 50,000 or less. From the viewpoint of moldability or after film formation, etc., the number-average molecular weight is preferably 200,000 or less, and more preferably 100,000 or less. Having a number-average molecular weight below the above value is also desirable because it improves the fluidity of paints containing aromatic polyether ketones, making it easier to obtain a smooth coating film.

[0025] Furthermore, the weight-average molecular weight of the aromatic polyetherketone may be 3,000 or more, 10,000 or more, 20,000 or more, 30,000 or more, 60,000 or more, 100,000 or more, 200,000 or more, 300,000 or more, 500,000 or more, 600,000 or more, or 900,000 or more. From the viewpoint of heat resistance, etc., the weight-average molecular weight of the aromatic polyetherketone is preferably 30,000 or more, and more preferably 50,000 or more. Furthermore, the weight-average molecular weight of the aromatic polyetherketone may be 1,500,000 or less, 1,000,000 or less, 500,000 or less, 300,000 or less, 150,000 or less, 100,000 or less, or 50,000 or less. From the viewpoint of moldability, etc., the weight-average molecular weight of the aromatic polyetherketone is preferably 150,000 or less, and more preferably 100,000 or less. Having a weight-average molecular weight below the above value is also preferable because it improves the fluidity of paints containing aromatic polyether ketones, making it easier to obtain a smooth coating film.

[0026] n may be 10 or more, 50 or more, 100 or more, 300 or more, 500 or more, 1000 or more, or 2000 or more. From the viewpoint of heat resistance, etc., n is preferably 100 or more, and more preferably 300 or more. Also, n may be 10000 or less, 7000 or less, 5000 or less, 3000 or less, 1000 or less, or 500 or less. From the viewpoint of moldability, etc., n is preferably 5000 or less, and more preferably 3000 or less.

[0027] (Content of aromatic polyether ketone) The content of aromatic polyether ketone in the coating film 12 may be 0.1% by mass or more, or 9.9% by mass or more, preferably 49% by mass or more, and more preferably 99% by mass or more, based on the total mass of the coating film 12. The amount of aromatic polyether ketone relative to the total mass of the coating film 12 may be 10% by mass or less, or 50% by mass or less, but preferably 99.9% by mass or less. Within the above range, the coating film of this disclosure has the advantage of having high non-stick properties while maintaining the durability of the film.

[0028] Whether or not a coating film contains aromatic polyetherketones can be confirmed by known analytical methods. For example, the presence of aromatic polyetherketones can be detected by Fourier transform infrared spectroscopy (FT-IR). In FT-IR detection, if aromatic C-H stretching vibrations are observed around 3100 cm⁻¹ and carbonyl C=O stretching vibrations are observed around 1650 cm⁻¹, and no vibrations originating from esters or imides are observed around 1700-1800 cm⁻¹, then the coating film can be identified as containing aromatic polyetherketones. Furthermore, by subjecting several standard samples with varying aromatic polyetherketone content to FT-IR analysis and creating a calibration curve in advance regarding the relationship with the peak intensity around 1650 cm⁻¹, the aromatic polyetherketone content of a coating film with an unknown content can be estimated by FT-IR.

[0029] (Organosilicon compound) The coating film 12 contains an organosilicon compound having a siloxane bond.

[0030] An example of such organosilicon compounds is the compound represented by the following structure: (R13)3Si-O-[-Si(R11)2-O-]a-Si(R13)3 (S1) [wherein R11 independently represents a hydrogen atom, an alkyl group having 1 to 40 carbon atoms, an aryl group having 4 to 20 carbon atoms, an alkoxy group having 1 to 40 carbon atoms, a hydroxyl group, or -O-[-Si(R11')2-O-]b-Si(R13')3, and R13 independently represents a hydrogen atom, an alkyl group having 1 to 40 carbon atoms, an aryl group having 4 to 20 carbon atoms, a hydroxyl group, an alkoxy group having 1 to 40 carbon atoms, or a saturated hydrocarbon group having 1 to 40 carbon atoms]. Each R11' independently represents a hydrogen atom, a C1-C40 alkyl group, a C4-C20 aryl group, a C1-C40 alkoxy group, a hydroxyl group, or -O-[-Si(R11')2-O-]b-Si(R13')3, where R13' is an elementary atom, a C1-C40 alkyl group, a C4-C20 aryl group, a hydroxyl group, a C1-C40 alkoxy group, or a saturated hydrocarbon group, and a is an integer from 3 to 2000.

[0031] In R11 and R13, the C1-C40 alkyl group and the C4-C20 aryl group may be unsubstituted or substituted. R11 and R13 are preferably unsubstituted.

[0032] In R11 and R13, the alkyl group has 1 to 40 carbon atoms, preferably 1 to 20, more preferably 1 to 12, and even more preferably 1 to 4. The alkyl group may be branched or linear. In one embodiment, the alkyl group is branched. In another embodiment, the alkyl group is linear.

[0033] In R11 and R13, the alkoxy group has 1 to 40 carbon atoms, preferably 1 to 20, more preferably 1 to 12, and even more preferably 1 to 4. The alkoxy group may be linear or branched. In one embodiment, the alkoxy group is branched. In another embodiment, the alkoxy group is linear.

[0034] Examples of alkoxy groups with 1 to 40 carbon atoms include the methoxy group, ethoxy group, propoxy group, and butoxy group.

[0035] In terms of ease of industrial manufacture and availability, and in terms of safety for the human body, R11 and R13 are preferably hydrogen atoms or methyl groups, and more preferably methyl groups, except when R11 is -O-[-Si(R11)2-O-]a-Si(R13)3.

[0036] When R11 is -O-[-Si(R11')2-O-]b-Si(R13')3, the other R11 bonded to the same Si is preferably an alkyl group having 1 to 40 carbon atoms, more preferably an alkyl group having 1 to 12 carbon atoms, even more preferably an alkyl group having 1 to 4 carbon atoms, and even more preferably a methyl group.

[0037] Furthermore, in formula (S1), one of the R13 atoms at one end of the molecule and one of the R13 atoms at the other end may combine to form -O-. In this case, the compound represented by formula (S1) may be a cyclic siloxane.

[0038] Specific examples of R11 and R13 include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, dodecyl group, tetradecyl group, hexadecyl group, octadecyl group; cyclopentyl group, cyclohexyl group, cycloheptyl group; phenyl group, tolyl group, naphthyl group, or groups in which some or all of the hydrogen atoms bonded to these groups are substituted with halogen atoms, amino groups, cyano groups, etc. R11 and R13 are preferably methyl groups or ethyl groups.

[0039] In R11' and R13', the C1-C40 alkyl group and the C4-C20 aryl group may be unsubstituted or substituted. R11' and R13' are preferably unsubstituted.

[0040] In R11' and R13', the alkyl group has 1 to 40 carbon atoms, preferably 1 to 20, more preferably 1 to 12, and even more preferably 1 to 4. The alkyl group may be branched or linear. In one embodiment, the alkyl group is branched. In another embodiment, the alkyl group is linear.

[0041] In R11' and R13', the alkoxy group has 1 to 40 carbon atoms, preferably 1 to 20, more preferably 1 to 12, and even more preferably 1 to 4. The alkoxy group may be linear or branched. In one embodiment, the alkoxy group is branched. In another embodiment, the alkoxy group is linear.

[0042] Examples of alkoxy groups with 1 to 40 carbon atoms include the methoxy group, ethoxy group, propoxy group, and butoxy group.

[0043] In terms of ease of industrial manufacture and availability, and in terms of safety for the human body, R11' and R13 are preferably hydrogen atoms or methyl groups, and more preferably methyl groups, except when R11' is -O-[-Si(R11)2-O-]a-Si(R13)3.

[0044] When R11’ is -O-[-Si(R11’)2-O-]b-Si(R13’)3, the other R11’ bonded to the same Si is preferably an alkyl group having 1 to 40 carbon atoms, more preferably an alkyl group having 1 to 12 carbon atoms, still more preferably an alkyl group having 1 to 4 carbon atoms, and even more preferably a methyl group.

[0045] Specific examples of R11’ and R13’ include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a dodecyl group, a tetradecyl group, a hexadecyl group, an octadecyl group; a cyclopentyl group, a cyclohexyl group, a cycloheptyl group; a phenyl group, a tolyl group, a naphthyl group, or a group in which some or all of the hydrogen atoms bonded to these groups are substituted with a halogen atom, an amino group, a cyano group, etc. R11’ and R13’ are preferably a methyl group or an ethyl group.

[0046] a is an integer of 3 to 2000. In terms of being easy to manufacture industrially and being easily available, a may be 1500 or less, 1000 or less, 800 or less, 500 or less, 200 or less, 100 or less, and is preferably 1000 or less. Also, a may be 10 or more, 50 or more, 100 or more, 200 or more, 300 or more, and is preferably 100 or more.

[0047] Among the total of the R11, R13 groups, R11’ groups, and R13’ groups, preferably 50 mol% to 100 mol%, more preferably 70 mol% to 100 mol%, still more preferably 90 mol% to 100 mol%, even more preferably 95 mol% to 100 mol%, and particularly preferably 98 mol% to 100 mol% are methyl groups.

[0048] In a preferred embodiment, the organosilicon compound contained in the coating film of the present disclosure is a compound represented by the following formula. (R13)3Si - O - [-Si(R11)2 - O -]a - Si(R13)3 (S3) [In the formula, R11 each independently represents an alkyl group having 1 to 12 carbon atoms, R13 each independently represents an alkyl group having 1 to 12 carbon atoms, and a is an integer of 3 to 2000.]

[0049] In the above formula (S3), R11 and R13 are more preferably methyl groups or ethyl groups, and are particularly preferably methyl groups.

[0050] The coating film of this disclosure may contain only one of the organosilicon compounds described above, or it may contain two or more. In a preferred embodiment, 80% or more, more preferably 90% or more, and even more preferably 99% or more of the total silicon compounds contained in the coating film of this disclosure are compounds represented by formula (S3). In an even more preferred embodiment, 95% or more, or 98% or more, and particularly preferably 100%, of all R11 groups of the organosilicon compounds represented by formula (S3) contained in the coating film of this disclosure are methyl groups.

[0051] The organosilicon compound can be synthesized by conventionally known methods. For example, it can be obtained by hydrosilylation of an α-olefin with a silicone having an SiH group.

[0052] (Content of organosilicon compounds) The content of the organosilicon compound in the coating film 12 may be 0.01% by mass or more, 0.1% by mass or more, 1% by mass or more, 3% by mass or more, or 5% by mass or more, based on the total mass of the coating film. Furthermore, the amount of the organosilicon compound may be 40% by mass or less, 30% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less, based on the total mass of the coating film. If the content of the organosilicon compound is within the above range, a coating film with an excellent balance of non-stick properties, smoothness, peel resistance, processability, etc. can be obtained.

[0053] The content of organosilicon compounds in the coating film 12 may be quantified by known methods, such as Fourier transform infrared spectroscopy (FT-IR), atmospheric pressure chemical ionization mass spectrometry (APCI / MS), electrospray ionization mass spectrometry (ESI / MS), gas chromatograph mass spectrometry (GC / MS), or pyrolysis gas chromatography-tomagnet-mass spectrometry (Py-GC / MS). In the case of quantification by Py-GC / MS, the content of organosilicon compounds can be obtained from the total amount of low-molecular-weight cyclic siloxanes generated by the thermal decomposition of organosilicon compounds in the material introduced into the pyrolizer.

[0054] (Other components, etc.) In addition to those described above, the coating film of this disclosure may also contain other components such as inorganic fillers and pigments.

[0055] Examples of inorganic fillers include silica, porous silica, alumina, titanium nitride, copper oxide, silicon carbide, carbon black, carbon nanotubes, carbon fiber or graphite fillers, and other carbon-based fillers, as well as diamond powder, talc, bentonite, kaolin, glass fiber, aluminum hydroxide, magnesium hydroxide, magnesium oxide, calcium carbonate, hydrotalcite, clay, calcium silicate, mica, barium sulfate, titanium dioxide, potassium titanate, barium titanate, aluminum nitride, boron nitride, zinc borate, aluminum borate, zinc oxide, montmorillonite, sepiolite, iron fillers, titanium fillers, zinc fillers, and aluminum fillers. These inorganic fillers may be used individually or in combination of two or more. The inorganic filler content may be, for example, 0.001% to 20% by mass or 0.005% to 10% by mass relative to the total mass of the coating film 12.

[0056] From the viewpoint of improving the thermal conductivity of the coating film, the coating film of this disclosure preferably contains at least one inorganic filler selected from the group consisting of diamond powder and silicon carbide. As a result, for example, when the coating film of this disclosure is applied to a cooking appliance component, a large number of fine bubbles are generated, allowing heat to be efficiently transferred to the food being heated. The coating film of this disclosure may contain both diamond powder and silicon carbide as inorganic fillers. Furthermore, the coating film of this disclosure may further contain the above-mentioned inorganic fillers in addition to diamond powder and silicon carbide.

[0057] Examples of pigments include iron oxide, titanium oxide, zinc oxide, titanium black, carbon black, barium white, talc, lamp black, chromium black, anthraquinone, pyrrole, and various other pigments or dyes. When used in components for cooking appliances, carbon black and titanium oxide are preferred from the viewpoint of safety for the human body. The pigment content may be, for example, 0.001% to 20% by mass, or 0.005% to 10% by mass, relative to the total mass of the coating film.

[0058] The content of other components in the coating film of this disclosure is not particularly limited and may be, for example, 0.001% to 20% by mass or 0.01% to 10% by mass relative to the total mass of the coating film.

[0059] The coating film 12 of this disclosure can be manufactured by forming a coating layer on the surface of a substrate 11 and post-treating the coating layer as necessary. The coating film 12 may be applied directly to the surface of the substrate 11, or it may be applied on top of a coating layer or the like applied to the surface of the substrate 11.

[0060] The coating film 12 can be formed by applying it to the surface of the substrate 11 so as to cover the surface. The coating method is not particularly limited, and for example, either a wet coating method or a dry coating method can be used.

[0061] Examples of wet coating methods include immersion coating, spin coating, flow coating, spray coating, roll coating, gravure coating, wipe coating, squeegee coating, die coating, inkjet, casting, Langmuir-Bludget method, and similar methods.

[0062] Examples of dry coating methods include vapor deposition (usually vacuum deposition), powder coating, sputtering, CVD, and similar methods. Specific examples of vapor deposition methods (usually vacuum deposition) include resistance heating, electron beam, high-frequency heating using microwaves, ion beam, and similar methods. Specific examples of powder coating include electrostatic powder coating, fluid immersion coating, and similar methods. Specific examples of CVD methods include plasma CVD, optical CVD, thermal CVD, and similar methods.

[0063] When using the wet coating method, the coating film of this disclosure may be diluted with a solvent as a paint before being applied to the substrate surface. From the viewpoint of solvent volatility, solubility, decomposition, etc., the following solvents are preferably used: water; aliphatic hydrocarbons such as hexane, cyclohexane, heptane, octane, nonane, decane, undecane, dodecane, mineral spirits; aromatic hydrocarbons such as benzene, toluene, xylene, naphthalene, solvent naphtha; methyl acetate, ethyl acetate, propyl acetate, n-butyl acetate, isopropyl acetate, isobutyl acetate, cellosolve acetate, propylene glycol methyl ether acetate, carbitol acetate, diethyl oxalate Esters such as acetone, ethyl pyruvate, ethyl-2-hydroxybutyrate, ethyl acetacetate, amyl acetate, methyl lactate, ethyl lactate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 2-hydroxyisobutyrate, ethyl 2-hydroxyisobutyrate; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, 2-hexanone, cyclohexanone, methylaminoketone, 2-heptanone; methanol, ethanol, iso-propanol, n-butanol, isobutanol Alcohols such as tert-butanol, sec-butanol, 3-pentanol, octyl alcohol, 3-methyl-3-methoxybutanol, and tert-amyl alcohol; glycols such as ethylene glycol and propylene glycol; cyclic ethers such as tetrahydrofuran, tetrahydropyran, and dioxane; amides such as N,N-dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone; methyl cellosolve, cellosolve, isopropyl cellosolve, butyl cellosolve, and diethylene Ether alcohols such as glycol monomethyl ether; diethylene glycol monoethyl ether acetate; ethers such as cyclopentyl methyl ether; siloxanes such as hexamethyldisiloxane, hexaethyldisiloxane, octamethyltrisiloxane, octamethylcyclotetrasiloxane, octamethylcyclopentasiloxane, decamethylcyclopentasiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, tetradecamethylhexasiloxane; dimethyl sulfoxides, etc.These solvents can be used individually or as a mixture of two or more. Water, aliphatic hydrocarbons, aromatic hydrocarbons, esters, ketones, glycol ethers, ethers, alcohols, ether alcohols, and siloxanes are preferred, with water being particularly preferred.

[0064] When using the drying coating method, the coating film of this disclosure may be subjected to the drying coating method as is, or it may be diluted with the solvent described above before being subjected to the drying coating method.

[0065] The thickness of the coating film 12 is not particularly limited, but may be 1 μm or more, preferably 5 μm or more, more preferably 10 μm or more, and may also be 200 μm or less, preferably 100 μm or less, more preferably 70 μm or less. If the thickness of the coating film 12 is within the above range, a coating film with an excellent balance of processability, non-adhesion, durability, etc. can be obtained.

[0066] The coating film 12 is preferably transparent. In this specification, "transparent" means that the transmittance of the coating film 12 is 50% or more in the visible light wavelength range (380 nm to 780 nm). Although not limited to theory, the coating film 12 may be transparent if the pigment content in the coating film 12 is 1% by mass or less, 0.1% by mass or less, or 0.01% by mass or less, or if the coating film 12 does not contain any pigment.

[0067] Preferably, the coating film 12 contains perfluoroalkyl compounds and polyfluoroalkyl compounds (PFAS) at a content of 1% by mass or less, 0.1% by mass or less, 0.01% by mass or less, 0.001% by mass or less, 0.0001% by mass or less, or 0.00001% by mass or less, relative to the total mass of the coating film 12. In particular, it is preferable that the coating film 12 does not contain PFAS (i.e., 0% by mass or below the detection limit). The PFAS content in the coating film may be detected by a known method (e.g., LC-MS / MS).

[0068] Apart from the above, it is preferable that the coating film 12 has a fluorine atom content of 1% by mass or less, 0.1% by mass or less, 0.01% by mass or less, 0.001% by mass or less, 0.0001% by mass or less, or 0.00001% by mass or less, relative to the total mass of the coating film 12. The fluorine atom content in the PFAS in the coating film may be detected by a known method (e.g., LC-MS / MS).

[0069] The surface roughness Ra of the coating film 12 may be 5 μm or less, preferably 2 μm or less, more preferably 1 μm or less, and even more preferably 0.6 μm or less, from the viewpoint of reducing the anchoring effect on the surface of the coating film and improving non-adhesion to various articles (e.g., food) on the coating film. Furthermore, from the viewpoint of processability, the surface roughness Ra of the coating film 12 may be 0.1 μm or more.

[0070] Aside from that, the surface roughness Ra of the coating film 12 may be 5 μm or more, preferably 7 μm or more, more preferably 10 μm or more, and even more preferably 20 μm or more, from the viewpoint of improving the durability of the coating film. Also, from the viewpoint of processability, the surface roughness Ra of the coating film 12 may be 50 μm or less.

[0071] [Second Embodiment] Next, a second embodiment will be described. According to the second embodiment of the present disclosure, a coating film is provided which is formed on a substrate, wherein the coating film contains an aromatic polyether ketone and an organosilicon compound having a siloxane bond, and the coating film comprises two or more coating layers, including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, wherein the content of the organosilicon compound in the first coating layer is less than the content of the organosilicon compound in the second coating layer.

[0072] Figure 2 is a schematic cross-sectional view of a laminate 2 including the coating film 12 of the present disclosure according to the second embodiment. As shown in Figure 2, the laminate 2 according to the second embodiment is the same as the first embodiment except that the coating film 12 consists of a first coating layer 121 and a second coating layer 122. That is, the laminate 2 has a substrate 11 and a coating film 12 consisting of a first coating layer 121 formed on the substrate and a second coating layer 122 formed thereon. The content of the organosilicon compound in the first coating layer 121 is less than the content of the organosilicon compound in the second coating layer 122.

[0073] The content of the organosilicon compound in the coating layer 121 may be 0% by mass or more, 0.001% by mass or more, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, or 0.5% by mass or more, based on the total mass of the coating layer 121, provided that it is less than the content of the organosilicon compound in the coating layer 122. Furthermore, the amount of the organosilicon compound may be 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 1% by mass or less, based on the total mass of the coating film. From the viewpoint of suppressing a decrease in adhesion between the substrate 11 and the coating layer 121, the content of the organosilicon compound in the coating layer 121 is more preferably 0.1% by mass or less, and particularly preferably 0% by mass.

[0074] The content of the organosilicon compound in the coating layer 122 may be 0.01% by mass or more, 0.1% by mass or more, 1% by mass or more, 3% by mass or more, or 5% by mass or more, based on the total mass of the coating layer 122, provided that it exceeds the content of the organosilicon compound in the coating layer 121. Furthermore, the amount of the organosilicon compound may be 40% by mass or less, 30% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less, based on the total mass of the coating. From the viewpoint of adhesion to the coating layer 121 and non-adhesion to articles (e.g., food) on the coating layer 122, 0.1% by mass to 20% by mass is preferred, 1% by mass to 15% by mass is more preferred, and 3% by mass to 10% by mass is even more preferred.

[0075] The aromatic polyether ketone content in the coating layer 121 may be 0.1% by mass or more, or 9.9% by mass or more, preferably 49% by mass or more, and more preferably 99% by mass or more, based on the total mass of the coating layer 121. Furthermore, the amount of aromatic polyether ketone in the coating layer 121 may be 10% by mass or less, or 50% by mass or less, based on the total mass of the coating layer 121, but preferably 99.9% by mass or less.

[0076] The aromatic polyetherketone content in the coating layer 122 may be 0.1% by mass or more, or 9.9% by mass or more, preferably 49% by mass or more, and more preferably 99% by mass or more, based on the total mass of the coating layer 122. The amount of aromatic polyetherketone in the coating layer 122 may be 10% by mass or less, or 50% by mass or less, based on the total mass of the coating layer 122, but preferably 99.9% by mass or less. Furthermore, the aromatic polyetherketone content (by mass) is preferably coating layer 122 > coating layer 121.

[0077] The aromatic polyether ketone content in the coating layer 121 may be 0.1% by mass or more, or 9.9% by mass or more, preferably 49% by mass or more, and more preferably 99% by mass or more, based on the total mass of the coating layer 121. Furthermore, the amount of aromatic polyether ketone in the coating layer 121 may be 10% by mass or less, or 50% by mass or less, based on the total mass of the coating layer 121, but preferably 99.9% by mass or less.

[0078] The aromatic polyetherketone content in the coating layer 122 may be 0.1% by mass or more, or 9.9% by mass or more, preferably 49% by mass or more, and more preferably 99% by mass or more, based on the total mass of the coating layer 122. The amount of aromatic polyetherketone in the coating layer 122 may be 10% by mass or less, or 50% by mass or less, based on the total mass of the coating layer 122, but preferably 99.9% by mass or less. Furthermore, the aromatic polyetherketone content (by mass) is preferably coating layer 122 > coating layer 121.

[0079] The coating layers 121 and 122 may also contain other additives as listed in the first embodiment (such as dyes and inorganic fillers). The inorganic filler may be a porous inorganic filler, and organosilicon compounds may be impregnated into the porous voids. This can further improve the effective life of the non-stick properties of the coating layers 121 and 122. The content of other additives in the coating layers 121 and 122 may vary depending on the application. For example, the coating layer 121 may contain dyes for decoration, and it is preferable to contain inorganic fillers from the viewpoint of improving adhesion to the substrate and adjusting the coefficient of expansion. The coating layer 122 is preferably free of inorganic fillers from the viewpoint of improving smoothness.

[0080] From the viewpoint of improving decorative properties, the coating layer 121 preferably contains carbon black. The carbon black content in the coating layer 121 may be 0.02% by mass or more, 0.1% by mass or more, 0.4% by mass or more, or 0.8% by mass or more, based on the total mass of the coating layer 121, and preferably 0.4% by mass or more. Furthermore, from the viewpoint of suppressing deterioration of the adhesiveness of the coating film, the carbon black content in the coating layer 121 may be 5% by mass or less, 2.5% by mass or less, or 1.5% by mass or less, based on the total mass of the coating layer 121, and preferably 2.5% by mass or less.

[0081] The thickness of the coating layer 121 is not particularly limited, but may be 0.5 μm or more, preferably 2.5 μm or more, more preferably 5 μm or more, and may also be 100 μm or less, preferably 45 μm or less, more preferably 30 μm or less. If the thickness of the coating layer 121 is within the above range, a coating film with excellent adhesion to the substrate and coating layer 122, processability, etc., can be obtained.

[0082] The thickness of the coating layer 122 is not particularly limited, but may be 0.5 μm or more, preferably 5 μm or more, more preferably 15 μm or more, and may also be 100 μm or less, preferably 50 μm or less, more preferably 35 μm or less. If the thickness of the coating layer 122 is within the above range, a coating can be obtained that has excellent adhesion to the coating layer 121, as well as durability, processability, and non-stick properties to articles (e.g., food).

[0083] In Embodiment 2, the coating film 12 is not limited to a two-layer coating film as shown in Figure 2, but may include three or more coating film layers. For example, a laminate having the coating film of this disclosure may have an intermediate coating film layer between the coating film layer 121 and the coating film layer 122. The thickness, component composition, and formation method of the intermediate coating film layer are not particularly limited and may be the same as, for example, any of the coating films listed in the first and second embodiments.

[0084] [Third Embodiment] Next, a third embodiment will be described. The third embodiment provides a coating film formed on a substrate, wherein the coating film contains an aromatic polyether ketone and an organosilicon compound having a siloxane bond, and the coating film includes two or more coating layers, including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, wherein the color of a part of the second coating layer is different from the color of the layer beneath the second coating layer.

[0085] Figure 3 is a schematic cross-sectional view of a laminate 3 including the coating film 12 of the present disclosure according to the third embodiment. As shown in Figure 3, the laminate 3 according to the third embodiment is the same as the second embodiment except that the second coating layer 122 consists of a coating layer portion 122a and a coating layer portion 122b that is a different color from the first coating layer 121. That is, the laminate 3 has a substrate 11 and a coating film 12 consisting of a first coating layer 121 formed on the substrate and a second coating layer 122 formed thereon, and the color of a part of the coating layer 122 is different from the color of the coating layer 121.

[0086] The coating layer 122b may be located on the surface of the coating film, as shown in Figure 3A. Alternatively, the coating layer 122b may be embedded within the coating layer 122, as shown in Figure 3B.

[0087] When the coating layer 122b is located on the surface of the coating film, it is preferable that the coating layer 122b has the same component composition, thickness, etc., as the coating layer 122a, except that it contains a specific pigment. The type and content of the specific pigment may be the same as that of the coating layer 122 in the second embodiment. By having a part of the coating layer 122 have a different color from the rest, it is possible to display characters, figures, grid lines, etc., on the coating film.

[0088] When the coating layer portion 122b is embedded within the coating layer 122, it is preferable that the coating layer portion 122b is a different color from both the lower layer (coating layer 121 in the case of Figure 3B) and the coating layer portion 122a, and that its thickness and component composition, excluding the pigment, are the same as those of the coating layer 121. The thickness of the coating layer portion 122b is not particularly limited as long as it is less than the coating layer portion 122a, and may be, for example, 1 μm or more or 5 μm or more. The type and content of the pigment contained in the coating layer portion 122b are not particularly limited as long as the condition that it is a different color from both the lower layer (coating layer 121 in the case of Figure 3B) and the coating layer portion 122a is met, and may be the same as the conditions exemplified in the coating 121 in the second embodiment. Furthermore, it is preferable that the coating layer portion 122a is transparent. With this configuration, the coating layer portion 122b can be printed on the coating layer 121 using a stamp or the like, so that characters, figures, grid lines, etc. can be displayed on the coating 12 while suppressing process costs.

[0089] The coating layer 122a is preferably transparent.

[0090] It is particularly preferable that the color of the coating layer 122b is different from the color of either the coating layer 122a or the substrate 11.

[0091] In Embodiment 3, the coating film 12 is not limited to a two-layer coating film as shown in Figure 3, but may be a coating film consisting of three or more coating layers. For example, a laminate having the coating film of this disclosure may have an intermediate coating layer between the coating layer 121 and the coating layer 122. The thickness, component composition, and formation method of the intermediate coating layer are not particularly limited and may be the same as any of the coating films listed in Embodiments 1 to 3.

[0092] [Fourth Embodiment] Next, a fourth embodiment will be described. According to the fourth embodiment of the present disclosure, a coating film formed on a substrate is provided, wherein the coating film contains an aromatic polyether ketone and an organosilicon compound having a siloxane bond, and has a concentration gradient of the organosilicon compound that increases in the thickness direction from the substrate to the surface.

[0093] Figure 4 is a schematic cross-sectional view of a laminate 4 including the coating film 12 of the present disclosure according to the fourth embodiment. As shown in Figure 4, in the laminate 4 according to the fourth embodiment, the coating film 12 has a concentration gradient of organosilicon compounds that increases in the thickness direction from the substrate 11 side to the surface of the laminate 4.

[0094] The concentration gradient can be expressed as follows: If C0 is the concentration of the organosilicon compound per unit area at the interface between the substrate 11 and the coating film 12, CT is the concentration of the organosilicon compound per unit area at the surface of the coating film 12, and T is the thickness of the coating film 12, then the concentration Ct of the organosilicon compound per unit area at a point t toward the surface in the thickness direction of the coating film 12 from the interface between the substrate 11 and the coating film 12 is preferably equal to or close to the value calculated by: C = C0 + (CT - C0) * (t / T) [where CT > C0]. For example, Ct may be in the range of 70% to 130%, 80% to 120%, 90% to 110%, 95% to 105%, or 99% to 101% of the above value of C, preferably in the range of 90% to 110%, and more preferably in the range of 95% to 105%.

[0095] In the fourth embodiment, from the viewpoint of adhesion between the substrate 11 and the coating film 12, C0 may be 0.

[0096] In the fourth embodiment, the concentration of the organosilicon compound may increase uniformly in the thickness direction from the substrate 11 to the surface of the laminate 4. Alternatively, as long as CT > C0, there may be regions where the concentration of the organosilicon compound decreases in the thickness direction from the substrate 11 to the surface of the laminate 4, or regions where the concentration repeatedly decreases or increases in the thickness direction from the substrate 11 to the surface of the laminate 4.

[0097] Furthermore, in the fourth embodiment, the coating film 12 is not limited to a single layer having a concentration gradient of organosilicon compounds as shown in Figure 4, but may be a coating film composed of a combination of two or more layers having a concentration gradient of organosilicon compounds and / or two or more layers having a constant concentration of organosilicon compounds. For example, in the fourth embodiment, the coating film may be a coating film consisting of a coating film layer formed on a substrate, having a concentration gradient of organosilicon compounds that increases in the thickness direction from the substrate side to the surface, on which a layer having a constant concentration of organosilicon compounds is formed. In any case, the concentration of organosilicon compounds per unit area is higher on the surface of the coating film 12 than at the interface between the substrate 11 and the coating film 12.

[0098] [Fifth Embodiment] Next, a fifth embodiment will be described. The fifth embodiment provides a coating film formed on a substrate, comprising two or more coating layers including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, wherein the color of a part of the substrate and / or the first coating layer is different from the color of the other part of the substrate and / or the first coating layer.

[0099] Figures 5A, 5B, and 5C are schematic cross-sectional views of a laminate 5 including the coating film 12 of the present disclosure according to the fifth embodiment. As shown in Figures 5A to 5C, the laminate 5 according to the fifth embodiment is the same as the second embodiment except that the base material 11 and / or the first coating layer 121 include a colored portion 13. The colored portion 13 included in the base material 11 and / or the first coating layer 121 has a different color from the parts of the base material 11 and / or the first coating layer 121 other than the colored portion 13.

[0100] The colored portion 13 may be located at the boundary between the substrate 11 and the first coating layer 121, as shown in Figure 5A. Alternatively, the colored portion 13 may be located at the boundary between the first coating layer 121 and the second coating layer 122, as shown in Figures 5B and 5C. Furthermore, if the colored portion 13 is included in the first coating layer 121, a portion of the colored portion 13 may also be included in the substrate.

[0101] Preferably, the colored portion 13 has the same component composition, thickness, etc., as the first coating layer 121, except that it contains a specific pigment. The type and content of the specific pigment may be the same as that of the coating layer 121 in the second embodiment. Furthermore, it is preferable that the colored portion 13 is different in color from the substrate 11 and / or the first coating layer 121 other than the colored portion 13, and also different in color from the second coating layer 122. By having a different color for the colored portion 13 from the other parts, characters, figures, grid lines, etc., can be visually identified when viewing the laminate from above.

[0102] The thickness of the colored portion 13 is not particularly limited and may be, for example, 1 μm or more or 5 μm or more, or 100 μm or 70 μm or less.

[0103] As shown in Figure 5A, if the substrate 11 of the laminate 5 includes a colored portion 13 but the first coating layer 121 does not include a colored portion 13, it is preferable that the first coating layer 121 and the second coating layer 122 are transparent.

[0104] As shown in Figures 5B and 5C, when the first coating layer 121 of the laminate 5 includes a colored portion 13, the second coating layer 122 is preferably transparent.

[0105] The manufacturing method for the laminate 5 of this embodiment may be, for example, in the form shown in Figures 5A and 5B, a method in which an incision is made in the base material 11 or the first coating layer 121, the paint according to the present disclosure is poured into the incised portion to form a colored portion 13, and a higher coating layer is formed on top of that. Alternatively, for example, in the form shown in Figure 5C, an incision may be made in the base material 11, the first coating layer 121 is formed on top of that, the paint according to the present disclosure is poured into the recess of the first coating layer 121 formed as a result of the first coating layer 121 biting into the incised portion of the base material 11 to form a colored portion 13, and a second coating layer 122 is formed on top of that. In this embodiment, by such a manufacturing method, pattern formation is possible even when the printing stamp method cannot be used as a process for forming patterns such as characters, figures, and grid lines on the laminate. Furthermore, the colored portion 13 of the laminate 5 of this embodiment may have excellent abrasion resistance.

[0106] In Embodiment 5, the coating film 12 is not limited to a two-layer coating film as shown in Figures 5A to 5C, but may be a coating film consisting of three or more coating layers. For example, a laminate having the coating film of this disclosure may have an intermediate coating layer between the coating layer 121 and the coating layer 122. The thickness, component composition, and formation method of the intermediate coating layer are not particularly limited and may be the same as, for example, any of the coating films listed in Embodiments 1 to 4.

[0107] In the first to fifth embodiments described above, known methods can be used to measure the component composition in the coating film 12, such as X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), trending X-ray spectroscopy (XRF), scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX), etc. For example, in the above embodiments, by subjecting a cross-section of the coating film 12 to SEM-EDX analysis, a depth profile of specific atomic concentrations can be obtained, thereby allowing the concentration or concentration gradient of organosilicon compounds in each coating layer to be calculated.

[0108] (Paints) Next, we will describe the paints related to this disclosure.

[0109] The paint of this disclosure is a paint for forming a coating film of this disclosure on a substrate.

[0110] In other words, the coatings of this disclosure include a resin containing the above-mentioned aromatic polyether ketone, the above-mentioned organosilicon compounds, and other components.

[0111] Various commercially available products may be used as the resin containing the above-mentioned aromatic polyetherketone. Specific examples of commercially available products include the "Vestakeep®" series from Polypla Evonik, the "Keetaspire®" series from Solvay, and the "PEEK" series from Victrex. These aromatic polyetherketone resins may be used as a single grade, or as a blend of multiple grades with different properties. Alternatively, resins synthesized by known methods may be used.

[0112] In the paint of this disclosure, the content of the above-mentioned aromatic polyetherketone may be 10% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, or 50% by mass or more, based on the total mass of the paint, or it may be 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, or 50% by mass or less, for example, 10% by mass to 80% by mass, or 20% by mass to 40% by mass.

[0113] Various commercially available products may be used as the organosilicon compounds included in the paints disclosed herein, depending on their application and purpose. For example, if the paint is a water-based paint, it is preferable to use a silicone emulsion in which the organosilicon compound is dispersed in water. Using a silicone emulsion improves the dispersibility of the silicone oil in the paint, which can improve non-stick properties and film smoothness. Furthermore, from the viewpoint of safety for the human body, it is preferable that the silicone be unmodified. Examples of commercially available products that satisfy these conditions include Shin-Etsu Chemical Co., Ltd.'s "KM-9782" and "KM-9783," and Dow-Toray's "XIAMSTER AFE-1530." These silicones may be used as a single grade, or as a blend of multiple grades with different properties.

[0114] In the paint of this disclosure, the content of the organosilicon compound described above may be 0.01% by mass or more, 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 3% by mass or more, or 5% by mass or more, or 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 3% by mass or less, for example, 0.5% by mass to 20% by mass, or 1% by mass to 10% by mass.

[0115] The paints disclosed herein may contain other components such as alcohols, pigments, inorganic fillers, water, and surfactants.

[0116] Examples of alcohols include monoalcohols such as methanol, ethanol, iso-propanol, n-butanol, isobutanol, tert-butanol, sec-butanol, 3-pentanol, octyl alcohol, 3-methyl-3-methoxybutanol, and tert-amyl alcohol, as well as glycols such as ethylene glycol and propylene glycol. From the viewpoint of improving the dispersibility of the coating of this disclosure, glycols are more preferred. These alcohols may be used individually or in combination of two or more. In one embodiment, the coating of this disclosure contains propylene glycol. The alcohol content may be, for example, 0.1% to 10% by mass, or 1% to 5% by mass, based on the total mass of the coating.

[0117] The inorganic filler may include any of the inorganic fillers described above as inorganic fillers that can be contained in the coating film. The inorganic filler content may be, for example, 0.01% to 10% by mass, or 0.1% to 5% by mass, based on the total mass of the paint. In one embodiment, the paint of the present disclosure contains carbon black. In another embodiment, the paint of the present disclosure contains titanium oxide.

[0118] As a pigment, any of the pigments described above may be included in the coating film. The pigment content may be, for example, 0.001% to 20% by mass, or 0.005% to 10% by mass, relative to the total mass of the paint. In one embodiment, the paint of this disclosure contains a carbon-based filler (e.g., silicon carbide). In another embodiment, the paint of this disclosure contains diamond powder.

[0119] The coatings of this disclosure may contain water as a dispersion medium. The water content may vary depending on the purpose, and may be, for example, 1% to 80% by mass, 5% to 50% by mass, or 10% to 40% by mass relative to the total mass of the coating.

[0120] Furthermore, the coatings of this disclosure preferably contain surfactants. The inclusion of surfactants in the coatings of this disclosure maintains the dispersibility of organosilicon compounds, thereby further improving the non-stick properties and smoothness of the coating film after application to a substrate. Examples of surfactants include nonionic surfactants such as propylene glycol stearate, polyoxyethylene alkyl ether, polyoxyethylene alkylene alkyl ether, isostearyl glyceryl ether, polyoxyethylene tridecyl ether, polyoxyalkylene tridecyl ether, polyoxyalkylene alkyl ether, polyoxyethylene lauryl ether, and polyoxyethylene octylphenyl ether; anionic surfactants such as polyoxyethylene lauryl ether ammonium sulfate, polyoxyethylene alkyl ether sodium sulfate, sodium dodecylbenzenesulfonate, alkyldiphenyl ether disulfonate sodium, and dioctyl sulfosuccinate sodium; and mixtures thereof. In one embodiment, the coatings of this disclosure contain polyoxyalkylene alkyl ether. The surfactant content may be, for example, 0.1 ppm to 100 ppm or 0.5 ppm to 10 ppm relative to the total mass of the paint.

[0121] Furthermore, the coatings of this disclosure do not necessarily have to contain a dispersion medium (e.g., water). If the coating does not contain a dispersion medium, it is preferable that it does not contain a surfactant. Also, if the coating does not contain water, the coatings of this disclosure may be a mixed powder of aromatic polyether ketone powder and organosilicon compound powder, or a powder in which organosilicon compound powder is attached to aromatic polyether ketone powder. Such coatings can be suitably used for powder coating, particularly electrostatic powder coating.

[0122] The coating film disclosed herein can be used in a wide range of applications, for example, as a coating for kitchen range components such as faucets, gas stoves, induction cooktops, microwave oven parts, oven parts, various pots and pans, and rice cooker inner pots; various pipes such as exhaust gas pipes, underbody metal pipes for automobiles, and ducts; various marine-related components such as fishing lines, fishing nets, and submersible pumps; water-related components such as shower curtains, toilets, bathtubs, and mops; fabrics such as clothing and nonwoven fabrics; glass fibers; interior materials; medical supplies; metal musical instruments; food packing; 3D printed molded products; precious metal panels; heat exchangers; and electric wires. It is particularly suitable for applications requiring both heat resistance and non-stick properties, and is especially suitable for use as a coating for cooking appliances such as frying pans, various pots and pans, and rice cooker inner pots.

[0123] 1 Laminate 1 11 Substrate 12 Coating 121 First coating layer 122 Second coating layer 13 Colored part 2 Laminate 2 3 Laminate 3 4 Laminate 4 5 Laminate 5

Claims

1. A coating film formed on a substrate, wherein the coating film contains an aromatic polyether ketone and an organosilicon compound having a siloxane bond.

2. The coating film according to claim 1, wherein the aromatic polyether ketone is a polyether ether ketone.

3. The organosilicon compound is represented by the following formula: (R １３ ) ３ Si—O—[—Si(R １１ ) ２ —O—] ａ —Si(R) １３ ) ３ [In the formula, R １１ each independently represents an alkyl group having 1 to 12 carbon atoms, R １３ each independently represents an alkyl group having 1 to 12 carbon atoms, and a is an integer of 3 to 2000.]. The coating film according to claim 1, which is a compound represented by the formula.

4. R １１ and R １３ The coating film according to claim 3, wherein is a methyl group.

5. The coating film according to claim 1, wherein the coating film comprises two or more coating film layers, including a first coating film layer formed on the substrate and a second coating film layer located on the surface of the coating film, and the content of the organosilicon compound in the first coating film layer is less than the content of the organosilicon compound in the second coating film layer.

6. The coating film according to claim 1, wherein the coating film comprises two or more coating layers, including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, and the color of a part of the second coating layer is different from the color of the layer beneath the second coating layer.

7. The coating film according to claim 1, wherein the coating film comprises two or more coating layers, including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, and the first coating layer comprises carbon black.

8. The coating film according to claim 1, wherein the coating film comprises two or more coating layers, including a first coating layer formed on the substrate and a second coating layer located on the surface of the coating film, and the color of a part of the substrate and / or the first coating layer is different from the color of the other part of the substrate and / or the first coating layer.

9. The coating film according to claim 1, having a concentration gradient of the organosilicon compound that increases in the thickness direction from the substrate side to the surface.

10. The coating film according to claim 1, wherein the content of perfluoroalkyl compounds and polyfluoroalkyl compounds is 1% by mass or less.

11. The coating film according to claim 1, wherein the content of fluorine atoms in the coating film is 1% by mass or less.

12. The coating film according to claim 1, wherein the surface roughness (Ra) is 1 μm or less.

13. The coating film according to claim 1, wherein the surface roughness (Ra) is 10 μm or more.

14. The coating film according to claim 1, wherein the thickness is 5 to 100 μm.

15. The coating film according to claim 1, further comprising at least one selected from the group consisting of diamond powder and silicon carbide.

16. A component for a cooking appliance, comprising a coating film according to any one of claims 1 to 15.

17. A paint comprising an aromatic polyether ketone and an organosilicon compound having a siloxane bond.

18. The paint according to claim 17, comprising a surfactant.

Images