Aqueous composition for screw member coating, and screw

Abstract

The purpose of the present invention is to provide an aqueous composition for a screw member coating film, which is an aqueous composition but is capable of achieving high visibility. The aqueous composition for a screw member coating film contains (A) an aqueous binder and (B) an aqueous emulsion containing a fluorescent pigment and having a surface tension of 15.5-80 mN / m.

Description

Technical Field

[0001] The present invention relates to an aqueous composition for coating a threaded component and a threaded component. Background Art

[0002] Conventionally, compositions for preventing loosening, bonding, and sealing, which are pre-coated on the threaded surfaces of threaded components such as screws, bolts, and nuts, have been known. For example, Patent Document 1 discloses an anti-loosening agent composition in the form of an aqueous dispersion, which contains microcapsules encapsulating an epoxy resin or the like as a reactive binder, and a liquid or semi-solid polyamide containing free amino groups that acts as a curing agent and also acts as a binder for the above microcapsules.

[0003] Here, by containing a pigment in the composition as described above, it can be made to exhibit various colors. For example, when titanium oxide is contained as a pigment, the composition can be made to appear white. Thus, by changing the color according to the grade of the composition (processing liquid) and the type of its processed product, there are effects such as improving the recognizability, thereby improving the work efficiency of workers, or reducing operational mistakes such as mis-taking.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-194032 Summary of the Invention

[0005] However, in conventional aqueous compositions for coating threaded components, a problem has been found in that so-called excellent visibility cannot be imparted.

[0006] Therefore, the object is to provide an aqueous composition for coating a threaded component that can impart excellent visibility.

[0007] In the present invention, intensive studies have been conducted to solve the above problems, and by using a curable composition having the following constitution, high visibility can be achieved even though it is an aqueous composition. It should be noted that the aqueous composition referred to here means a system composition in which water is 50% by mass or more of the solvent.

[0008] That is,

[0009] [1] An aqueous composition for coating a threaded component, which contains an aqueous binder as component (A) and an aqueous emulsion-type fluorescent pigment having a surface tension of 15.5 to 80 mN / m as component (B).

[0010] [2] Regarding the aqueous composition for coating a threaded component described in [1], the above component (B) is an aqueous emulsion-type organic fluorescent pigment, which contains resin particles containing a substance that emits fluorescent green light or fluorescent blue light.

[0011] [3]Regarding the aqueous composition for the film of the threaded member described in [1] or [2], the above component (A) is at least one selected from the group consisting of (meth)acrylic polymer emulsion, (meth)acrylic acid-styrene copolymer emulsion, and ethylene-vinyl acetate copolymer emulsion.

[0012] [4]Regarding the aqueous composition for the film of the threaded member described in any one of [1] to [3], it further contains a non-fluorescent colorant as component (C).

[0013] [5]Regarding the aqueous composition for the film of the threaded member described in any one of [1] to [4], it further contains microcapsules encapsulating a curable compound as component (D).

[0014] [6]Regarding the aqueous composition for the film of the threaded member described in [5], it further contains microcapsules encapsulating a curing agent as component (E).

[0015] [7]Regarding the aqueous composition for the film of the threaded member described in any one of [1] to [6], the addition amount of the solid component of the component (B) of the present invention is 0.05 to 10 parts by mass with respect to 10 parts by mass of the solid component of the above component (A).

[0016] [8]A cured product obtained by drying or curing the aqueous composition for the film of the threaded member described in any one of [1] to [7].

[0017] [9]A threaded member covered with the aqueous composition for the film of the threaded member described in any one of [1] to [8].

[0018] The present invention also includes the following forms and manners.

[0019] 1. An aqueous composition for the film of a threaded member, which contains component (A): an aqueous binder, and component (B): an aqueous emulsion having a surface tension of 15.5 to 80 mN / m and containing a fluorescent pigment.

[0020] 2. Regarding the aqueous composition for the film of the threaded member described in 1., the above component (B) is an aqueous emulsion, which contains resin particles containing a substance that emits fluorescent green light or fluorescent blue light.

[0021] 3. Regarding the aqueous composition for the film of the threaded member described in any one of 1. or 2., the above component (A) is at least one selected from the group consisting of (meth)acrylic polymer emulsion, (meth)acrylic acid-styrene copolymer emulsion, and ethylene-vinyl acetate copolymer emulsion.

[0022] 4. Regarding the aqueous composition for coating the threaded member according to any one of 1. to 3., it further contains component (C): a non-fluorescent colorant.

[0023] 5. Regarding the aqueous composition for coating the threaded member according to any one of 1. to 4., it further contains component (D): microcapsules encapsulating a curable compound.

[0024] 6. Regarding the aqueous composition for coating the threaded member according to 5., it further contains component (E): microcapsules encapsulating a curing agent.

[0025] 7. Regarding the aqueous composition for coating the threaded member according to any one of 1. to 6., the addition amount of the solid component of the above-mentioned component (B) is 0.05 to 10 parts by mass with respect to 10 parts by mass of the solid component of the above-mentioned component (A).

[0026] 8. Regarding the aqueous composition for coating the threaded member according to any one of 1. to 7., the viscosity of the above-mentioned component (B) is 14 mPa·s or more.

[0027] 9. Regarding the aqueous composition for coating the threaded member according to 8., the pH of the above-mentioned component (B) is 5.15 to 5.30.

[0028] 10. Regarding the aqueous composition for coating the threaded member according to any one of 1. to 9., it contains talc and mica.

[0029] 11. Regarding the aqueous composition for coating the threaded member according to 10., the contained mass of the above-mentioned talc is 1.2 to 4.0 times the contained mass of mica.

[0030] 12. A cured product obtained by drying and / or curing the aqueous composition for coating the threaded member according to any one of 1. to 11.

[0031] 13. A threaded member, at least a part of which is covered with the aqueous composition for coating the threaded member according to any one of 1. to 12.

[0032] 14. A threaded member, at least a part of which is covered with the cured product according to 12.

[0033] 15. An aqueous composition for coating a threaded member, which is obtained by mixing component (A): an aqueous binder, and component (B): an aqueous emulsion having a surface tension of 15.5 to 80 mN / m and containing a fluorescent pigment. Detailed Description

[0034] Hereinafter, the present invention will be described in detail. It should be noted that in this specification, the use of "X to Y" means including the values (X and Y) described before and after it as the lower limit value and the upper limit value, that is, "X or more and Y or less". When there are multiple "X to Y" described, for example, when described as "X1 to Y1, or X2 to Y2", each value is disclosed as the upper limit, each value is disclosed as the lower limit, and the combinations of their upper limits and lower limits are all disclosed (that is, it becomes a legal basis for amendment). Specifically, amendments of X1 or more, Y2 or less, X1 or less, Y2 or more, X1 to X2, X1 to Y2, etc. are all necessarily regarded as legal. The components constituting the composition can be contained in the composition in two or more kinds as long as there is no special description. Regarding the description of its usage amount, addition amount, etc., in the case of combining two or more kinds, it can refer to the total amount. In addition, when the present disclosure is described from the perspective of a Markush group, those skilled in the art will recognize that the present disclosure is described from the perspective of any individual constituent element or partial group of the constituent elements of the Markush group. In addition, unless otherwise specified, the operations and measurements of physical properties, etc. are carried out under the conditions of room temperature (20 to 25 °C) / relative humidity 40 to 55% RH.

[0035] One embodiment of the present invention is an aqueous composition for a threaded component coating film, which contains component (A): an aqueous binder, and component (B): an aqueous emulsion containing a fluorescent pigment and having a surface tension of 15.5 to 80 mN / m. According to this configuration, although it is an aqueous composition, high visibility is achieved.

[0036] The present invention can provide an aqueous composition for a threaded component coating film that can achieve high visibility although it is an aqueous composition. In this specification, the "aqueous composition for a threaded component coating film" is sometimes abbreviated as "composition". It should be noted that the aqueous composition for a threaded component coating film is roughly divided into a non-curable composition and a curable composition. The non-curable composition is a composition that does not contain a curable compound. On the other hand, the curable composition is a composition that contains a curable compound. Specifically, in order to prepare a curable composition, for example, it can contain microcapsules encapsulating a curable compound as component (D) described later, and microcapsules containing a curing agent that reacts with the curable compound contained in the microcapsules of component (D) as component (E).

[0037] <Component (A)>

[0038] The aqueous composition for a threaded component coating film of the present invention contains component (A).

[0039] The component (A) of the present invention is an aqueous binder. The above-mentioned component (A) is not particularly limited, but by combining with other components of the present invention, an aqueous composition for a thread member film that is an aqueous composition but can achieve high visibility and has excellent fixing force can be further obtained. Therefore, a (meth)acrylic polymer emulsion, a (meth)acrylic acid-styrene copolymer emulsion, an ethylene-vinyl acetate copolymer emulsion, etc. are preferred, and a (meth)acrylic acid-styrene copolymer emulsion is particularly preferred. In addition, since the component (A) can significantly reduce the environmental load, water can be used as a solvent. They can be used alone or two or more of them can be used in combination. The mass ratio of the solid component to water in the component (A) is preferably 1:99 to 99:1, more preferably 20:80 to 70:30. According to one embodiment of the present invention, the mass ratio of the solid component to water in the component (A) is 30:70 to 60:40, 35:65 to 55:45, or 35:65 to 48:52.

[0040] Examples of commercially available products of the above (meth)acrylic polymer emulsions include JURYMER AC-10S, JURYMER AS-10SH (products of Toagosei Co., Ltd.), ACRYSET ARL-468, ACRYSET ARL-460 (products of Nippon Shokubai Co., Ltd.), Polysol AP-1761, Polysol AP-5595N, Polysol AP-4690N (products of Showa Denko K.K. (now Resonac Holdings Corporation)), Newcoat SFK-1000A, Newcoat SFK-8000A, Newcoat KSB-1 (products of Shin-Nakamura Chemical Co., Ltd.), Mowinyl 727, Mowinyl 7525, Mowinyl 745 (products of Nippon Synthetic Chemical Industry Co., Ltd.), ACRONAL 7064 (products of BASF JAPAN Ltd.), etc., but are not limited to these. In addition, examples of commercially available products of the above (meth)acrylic acid-styrene copolymer emulsions include Polysol AP-6750, AP-3160A (products of Showa Highpolymer Co., Ltd. (now Resonac Holdings Corporation)), VONCOAT4280 (products of DIC Corporation), ACRONAL YS-756ap, YS-800ap, PDX-7430, YJ2741Dap (products of BASF JAPAN Ltd.), etc., but are not limited to these. In addition, examples of commercially available products of the above ethylene-vinyl acetate copolymer emulsions include Sumikaflex 410HQ, 408HQE (products of Sumika Chemtex Corporation), Polysol EVA EL-851 (products of Showa Highpolymer Co., Ltd. (now Resonac Holdings Corporation)), etc., but are not limited to these.

[0041] According to one embodiment of the present invention, the glass transition temperature (the glass transition temperature of the theoretical value calculated by the FOX equation) of the (meth)acrylic acid-styrene copolymer (when it becomes a cured product) is 5 to 30°C, or 10 to 20°C.

[0042] In the present invention, the addition amount of the solid component of the component (A) is preferably 0.5 to 50% by mass, more preferably 1 to 30% by mass, and particularly preferably 3 to 20% by mass, based on the whole composition. According to one embodiment of the present invention, the addition amount of the solid component of the component (A) is 3.5 to 15% by mass, 3.7 to 11% by mass, 4 to 10% by mass, 4.5 to 9% by mass, or 5 to 8% by mass based on the whole composition. By being within the above range, it is further possible to obtain an aqueous composition for a thread member film that can achieve high visibility and has excellent adhesion despite being an aqueous composition. It should be noted that in this specification, the solid component refers to the residue excluding volatile components, and the residue can be solid or liquid at normal temperature.

[0043] <Component (B)>

[0044] The aqueous composition for a thread member film of the present invention contains a component (B).

[0045] As the component (B) of the present invention, it is an aqueous emulsion containing a fluorescent pigment and having a surface tension of 15.5 to 80 mN / m. By combining with other components of the present invention, it has a remarkable effect of achieving high visibility despite being an aqueous composition. The surface tension of the above component (B) is preferably 16.0 to 50 mN / m, and particularly preferably 16.5 to 30 mN / m. According to one embodiment of the present invention, the surface tension of the above component (B) is 16.0 to 24.0 mN / m, 16.1 to 23.0 mN / m, 16.2 to 20.0 mN / m, 16.3 to 19.0 mN / m, or 16.4 to 18.0 mN / m. By being in such a range, the fluorescence color development can be enhanced. In addition, when the composition contains microcapsules encapsulating a curable compound, the adhesion of the cured product can be further improved. It should be noted that as the measurement method of the above "surface tension", methods such as the plate method, the ring method, the pendant drop method, and the maximum bubble pressure method can be cited, but the plate method is preferred. Specifically, it is preferred to measure the static surface tension by the plate method (such as the platinum plate method) using the DY series (such as DY-200 or DY-300) of an automatic surface tensiometer manufactured by Kyowa Interface Science Co., Ltd. in an environment of 25 °C and a relative humidity of 55% RH.

[0046] As a specific example of the above component (B), an aqueous emulsion containing resin particles can be cited. The resin particles contain a substance (organic fluorescent pigment) that emits fluorescent green light or fluorescent blue light. According to one embodiment of the present invention, as the substance that emits fluorescent green light, it preferably has a peak of the emission spectrum in the wavelength range of 490 to 575 nm (preferably 490 to 570 nm, 490 to 560 nm, or 490 to 550 nm). As the substance that emits fluorescent blue light, it preferably has a peak of the emission spectrum in the wavelength range of 425 nm or more and less than 490 nm (preferably 430 nm or more and less than 490 nm).

[0047] In addition, since component (B) can significantly reduce the environmental load, water can be used as a solvent. They can be used alone, or two or more of them can be used in combination. The mass ratio of the solid component to water in component (B) is preferably 1:99 to 99:1, more preferably 20:80 to 70:30. According to one embodiment of the present invention, the mass ratio of the solid component to water in component (B) is 30:70 to 60:40, or 35:65 to 55:45.

[0048] There is no particular limitation on the average particle diameter of the resin particles contained in the above component (B), but it is preferably 0.01 to 50 μm, more preferably 0.05 to 20 μm. According to one embodiment of the present invention, the average particle diameter of the resin particles of the above component (B) is 0.06 to 10 μm, 0.07 to 5 μm, 0.07 to 1 μm, or 0.08 to 0.5 μm. It should be noted that the "average particle diameter" refers to the average particle diameter measured by a laser diffraction particle size distribution measuring device or an electron microscope.

[0049] According to one embodiment of the present invention, the resin particles are preferably styrene-acrylonitrile-acrylic acid polymers, methyl methacrylate-methyl acrylonitrile polymers, methyl methacrylate-acrylonitrile-glycidyl methacrylate polymers, or styrene-methyl methacrylate-acrylonitrile-methacrylic acid polymers, etc.

[0050] Examples of the substance that emits fluorescent green light or fluorescent blue light in the component (B) above include 3-(2-quinolinylmethylene)isoindolin-1-one), and examples of the compound that emits fluorescent blue light include cobalt aluminate. In addition, examples of the substance that emits fluorescent green light include manganese-activated zinc silicate phosphor (Zn2SiO4:Mn), copper-activated zinc sulfide phosphor (ZnS:Cu), copper- and aluminum-activated zinc sulfide phosphor (ZnS:Cu,Al), copper-activated zinc cadmium sulfide ((Zn,Cd)S:Cu), zinc-activated zinc oxide phosphor (ZnO:Zn), copper-activated zinc cadmium sulfide phosphor ((Zn,Cd)S:Cu), titanium-activated calcium magnesium silicate phosphor ((Ca,Mg)SiO3:Ti), silver-activated zinc thioselenide phosphor (Zn(S,Se):Ag), ZnS:Cu,Cl,Au, ZnS:Cu,Cl,Al, ZnS:Cu,Cl, Zn2SiO4:Mn, Y2SiO5:Tb, (Zn,Cd)S:Cu,Al, Y3Al5O 12 :Tb, or Y2O2S:Tb, etc.

[0051] It should be noted that even if the component (B) literally conforms to the organic pigments and inorganic pigments of the component (C) described below, when it exhibits fluorescence color development, it can be treated as the component (B).

[0052] According to one embodiment of the present invention, the pH of the aqueous emulsion having a surface tension of 15.5 to 80 mN / m constituting the composition is preferably 3.00 to 7.00, 3.50 to 6.50, 4.00 to 6.00, 4.50 to 5.50, 5.00 to 5.40, or 5.15 to 5.30. By making the pH of the component (B) an appropriate value, the fixing power is significantly improved. The pH can be measured, for example, using a commercially available pH meter such as the pH meter D54 manufactured by Horiba, Ltd.

[0053] According to one embodiment of the present invention, the viscosity of the aqueous emulsion having a surface tension of 15.5 to 80 mN / m constituting the composition is 10 to 20 mPa·s, 12 to 18 mPa·s, 14 to 18 mPa·s, or 16 to 18 mPa·s. According to one embodiment of the present invention, the viscosity of the aqueous emulsion having a surface tension of 15.5 to 80 mN / m constituting the composition is 14 mPa·s or more. By making the viscosity of the component (B) an appropriate value, the fixing power is significantly improved. The viscosity can be measured, for example, using a B-type or E-type (preferably B-type) rotational viscometer. As the B-type rotational viscometer, a UL low-viscosity adapter (including a matching rotor) can be used in the Brookfield digital viscometer (model: DV1M, product name: LVDV1M). It should be noted that the viscosity is the measured value at 25°C.

[0054] As commercially available products of the above-mentioned component (B), there is no particular limitation, but examples include MLCB12, MLCB18 (manufactured by Shinloihi Co., Ltd.), etc.

[0055] The addition amount of the solid component of the component (B) of the present invention is preferably 0.05 to 10 parts by mass, more preferably 0.07 to 5 parts by mass, and particularly preferably 0.1 to 3 parts by mass with respect to 10 parts by mass of the solid component of the above-mentioned component (A). According to one embodiment of the present invention, the addition amount of the solid component of the component (B) is 0.1 to 2 parts by mass, 0.2 to 1 part by mass with respect to 10 parts by mass of the solid component of the above-mentioned component (A).

[0056] In addition, the solid component of the component (B) is preferably 0.01 to 20% by mass, more preferably 0.03 to 10% by mass, and particularly preferably 0.05 to 5% by mass with respect to the whole composition. According to one embodiment of the present invention, the solid component of the component (B) is 0.05 to 4% by mass, 0.06 to 3% by mass, 0.07 to 2% by mass, 0.08 to 1% by mass, 0.09 to 0.8% by mass, 0.1 to 0.6% by mass, or 0.1 to 0.4% by mass with respect to the whole composition. By making the above-mentioned component (B) within the above range, a water-based composition for a thread member film that is a water-based composition but can achieve high visibility and has excellent adhesion can be further obtained. In this specification, the solid component refers to the residue excluding volatile components, and the residue can be solid or liquid at normal temperature.

[0057] According to one embodiment of the present invention, the proportion of the substance that emits fluorescent green light or fluorescent blue light in the solid component of the component (B) can be 0.99 to 1.96% by mass.

[0058] <Component (C)>

[0059] The water-based composition for a thread member film of the present invention may contain a component (C).

[0060] Furthermore, as the component (C) that can be used in the present invention, it is a non-fluorescent colorant. When a non-fluorescent colorant is contained in an aqueous emulsion ((B) component) containing a fluorescent pigment and having a surface tension of 15.5 to 80 mN / m, the non-fluorescent colorant ((C) component) can exclude the solid component of the above-mentioned (B) component.

[0061] By using the component (C) in the present invention, it is possible to confirm color development under fluorescent light and natural light environments. In the case of using the above-mentioned component (B), it is possible to confirm color development under an ultraviolet irradiation environment. Even when the component (B) and the component (C) of the present invention are used in combination, neither of them will inhibit color development, and a coating film with different colors under a fluorescent light environment and an ultraviolet irradiation environment can be obtained. The "non-fluorescent" of the above-mentioned component (C) does not develop color (luminescence) (there is no peak in the emission spectrum) under the irradiation of ultraviolet rays (365 nm).

[0062] (C) component can be used by being dispersed in a dispersion medium such as solvents like alcohols and ketones, plasticizers, water, etc.

[0063] Examples of the above-mentioned component (C) include dyes, pigments, etc. As the above-mentioned pigments, organic pigments, inorganic pigments, etc. can be cited. As the above-mentioned organic pigments, there is no particular limitation, but isoindolinone, isoindoline, methineimine, perylene, dioxazine, Pigment Blue - 15 (alias 29H,31H - phthalocyanato(2 - ) - N29,N30,N31,N32 copper), phthalocyanines such as Pigment Green - 7 (copper polychlorophthalocyanine), Permanent Carmine FB, 1,4 - bis[1' - (dichlorophenylazo) - 2' - hydroxynaphthalene - 3' - carbonylamino]benzene, Solvent Yellow - 16 can be cited. As the above-mentioned inorganic pigments, there is no particular limitation, but carbon black, ultramarine, cobalt blue, iron oxide (ferric oxide), titanium oxide such as CI Pigment Green 50 (green spinel of cobalt titanate), etc. can be cited.

[0064] Among them, since the dispersibility with respect to the component (A) of the present invention is excellent, cobalt blue, ultramarine, and titanium oxide are preferred. They can be used alone, or two or more of them can be used in combination. Here, cobalt blue is also called cobalt cyan, and it is known as a very stable pigment that is excellent in light resistance, weather resistance, acid resistance, and alkali resistance. The composition formula is represented by CoAl2O4 (cobalt aluminate) or CoO·Al2O3 (spinel of cobalt oxide and alumina). Ultramarine is a kind of inorganic pigment, and its constituent components are a mixture of sulfide ions and sulfate ions in aluminum and sodium silicate. It exists naturally as the main component of lapis lazuli.

[0065] The component (C) of the present invention can contain a dispersion medium such as water. The addition amount of the solid component of the component (C) is preferably 0.05 to 10 parts by mass, more preferably 0.1 to 7 parts by mass, further preferably 0.3 to 5 parts by mass, still more preferably 0.3 to 2 parts by mass, and still more preferably 0.3 to 1 part by mass with respect to 10 parts by mass of the solid component of the above-mentioned component (A). By the component (C) being within the above range, it is further possible to obtain an aqueous composition for a threaded part film that is a water-based composition but can achieve high visibility and has excellent adhesion.

[0066] <(D) component>

[0067] Furthermore, in order to impart curability to the aqueous composition for the film of the threaded member of the present invention, microcapsules encapsulating a curable compound may be contained as the (D) component. Thereby, direct contact between the curable compound and the substance obtained by curing the curable compound can be avoided, and the storage stability of the aqueous composition for the film of the threaded member can be ensured. By adding the (D) component, an aqueous composition for the film of a threaded member that is an aqueous composition but can achieve high visibility and has excellent adhesion can be further obtained.

[0068] Examples of the curable compound contained in the microcapsules of the above (D) component include (meth)acrylate compounds (acrylic acid or acrylic functional compounds) or epoxy compounds. The curable compound contains one kind or a combination of two or more kinds.

[0069] The above (meth)acrylate compound is a (meth)acrylate having one or more (meth)acryloyl groups per molecule. Specifically, it refers to a (meth)acrylate oligomer or a (meth)acrylate monomer. The difference between the monomer and the oligomer can be divided by a weight average molecular weight (or molecular weight) of 1000, and the weight average molecular weight (or molecular weight) of the monomer is 1000 or less. Since the aqueous composition for the film of the threaded member of the present invention is an aqueous composition but has excellent adhesion, it contains only (meth)acrylate monomers.

[0070] Specific examples of the (meth)acrylate oligomer include urethane-modified (meth)acrylate oligomers, etc., and the main skeletons thereof include bisphenol A, novolac phenol, polybutadiene, polyester, polyether, etc., but are not limited to these.

[0071] The above urethane-modified (meth)acrylate oligomer is a compound having a urethane bond formed by reacting an isocyanate group and a hydroxyl group, and a (meth)acryloyl group. The above epoxy-modified (meth)acrylate oligomer can be synthesized by ring-opening polymerization of the glycidyl group of a polyfunctional glycidyl ether compound with (meth)acrylic acid, etc., but is not limited to these. As the main chain of the polyfunctional glycidyl ether, various skeletons such as bisphenol A type, bisphenol F type, and novolac phenol type can be used.

[0072] As the (meth)acrylate monomer, monofunctional, bifunctional, and trifunctional (meth)acrylate monomers can be contained. From the viewpoint of curability, it is preferable to contain bifunctional and trifunctional (meth)acrylate monomers, and particularly preferably bifunctional. In addition, multiple other monomers can also be used in combination.

[0073] Specific examples of the monofunctional (meth)acrylate monomer include lauryl (meth)acrylate, stearyl (meth)acrylate, ethyl carbitol (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, caprolactone-modified tetrahydrofurfuryl (meth)acrylate, cyclohexyl (meth)acrylate, dicyclopentyl (meth)acrylate, isobornyl (meth)acrylate, benzyl (meth)acrylate, phenyl (meth)acrylate, phenoxyethyl (meth)acrylate, phenoxydiethylene glycol (meth)acrylate, phenoxytetraethylene glycol (meth)acrylate, nonylphenoxyethyl (meth)acrylate, nonylphenoxytetraethylene glycol (meth)acrylate, methoxydiethylene glycol (meth)acrylate, ethoxydiethylene glycol (meth)acrylate, butoxyethyl (meth)acrylate, butoxytriglycol (meth)acrylate, 2-ethylhexyl polyethylene glycol (meth)acrylate, 4-hydroxybutyl (meth)acrylate, nonylphenyl polypropylene glycol (meth)acrylate, methoxydipropylene glycol (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, glycerol (meth)acrylate, polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, epichlorohydrin-modified butyl (meth)acrylate, epichlorohydrin-modified phenoxy (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, (meth)acryloyl acid, 3-(meth)acryloyloxypropyl succinic acid, 4-(meth)acryloyloxybutyl succinic acid, 2-(meth)acryloyloxyethyl maleic acid, 3-(meth)acryloyloxypropyl maleic acid, 4-(meth)acryloyloxybutyl maleic acid, 2-(meth)acryloyloxyethyl hexahydrophthalic acid, 3-(meth)acryloyloxypropyl hexahydrophthalic acid, 4-(meth)acryloyloxybutyl hexahydrophthalic acid, 2-(meth)acryloyloxyethyl phthalic acid, 3-(meth)acryloyloxypropyl phthalic acid, 4-(meth)acryloyloxybutyl phthalic acid, 2-ethylhexyl acid phosphate, 2-hydroxyethyl (methacrylate) acid phosphate, etc., but are not limited thereto.

[0074] According to one embodiment of the present invention, the curable compound does not contain a monofunctional (meth)acrylate.

[0075] According to one embodiment of the present invention, the (meth)acrylate compound has a bisphenol skeleton. According to one embodiment of the present invention, the (meth)acrylate compound has an oxyalkylene group. As the number of carbon atoms of the oxyalkylene group, 1 to 4 or 1 to 3 is preferred, or 1 or 2 is preferred. According to one embodiment of the present invention, the (meth)acrylate compound has two or three (meth)acryloyl groups and has a bisphenol skeleton and an oxyalkylene group.

[0076] According to an embodiment of the present invention, the (meth)acrylate compound has an alkyl glycol di(meth)acrylate. The number of carbon atoms of the alkyl group in the alkyl glycol di(meth)acrylate is preferably 1 to 11, 2 to 10, 3 to 9, 4 to 8, or 5 to 7.

[0077] Specific examples of the bifunctional (meth)acrylate monomer include 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate (1,6-hexamethylene glycol di(meth)acrylate), ethylene glycol diacrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, dimethylol tricyclodecane di(meth)acrylate, ethylene oxide-modified neopentyl glycol di(meth)acrylate, propylene oxide-modified neopentyl glycol di(meth)acrylate, bisphenol A di(meth)acrylate, ethoxy-modified bisphenol A type epoxy di(meth)acrylate, bisphenol F di(meth)acrylate, ethoxy-modified bisphenol F type epoxy di(meth)acrylate, neopentyl glycol-modified trimethylolpropane di(meth)acrylate, dicyclopentenyl di(meth)acrylate, ethylene oxide-modified dicyclopentenyl di(meth)acrylate, diacryloyl isocyanurate, etc., but are not limited to these. Among them, in order to obtain an aqueous composition for a threaded part film having excellent adhesion even though it is an aqueous composition, it is preferable to use one or more of ethoxy-modified bisphenol A type epoxy di(meth)acrylate, ethoxy-modified bisphenol F type epoxy di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and dimethylol tricyclodecane di(meth)acrylate.

[0078] According to an embodiment of the present invention, the curable compound in the component (D) is preferably a combination of two or more compounds. As the combination, any combination of the above-listed compounds can be used, but it is preferable that the curable compound in the component (D) contains (d1) a (meth)acrylate having a bisphenol skeleton and an oxyalkylene group, and (d2) an alkyl glycol di(meth)acrylate. According to an embodiment of the present invention, the mass ratio of the contents of (d1) and (d2) ((d1):(d2)) is preferably 30:70 to 70:30, or 40:60 to 60:40.

[0079] According to an embodiment of the present invention, the (meth)acrylate compound contains only bifunctional compounds.

[0080] Specific examples of the trifunctional (meth)acrylate monomer include trimethylolpropane tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, EO-modified trimethylolpropane tri(meth)acrylate, PO-modified trimethylolpropane tri(meth)acrylate, ECH-modified trimethylolpropane tri(meth)acrylate, ECH-modified glycerol tri(meth)acrylate, tris(acryloyloxyethyl) isocyanurate, etc., but are not limited to these.

[0081] According to one embodiment of the present invention, the curable compound does not contain a trifunctional (meth)acrylate.

[0082] It should be noted that when the curable compound contains both (meth)acryloyl and epoxy groups, it is classified as a (meth)acrylate compound.

[0083] According to one embodiment of the present invention, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more of the curable compound is composed of a (meth)acrylate compound (upper limit: 100% by mass). According to one embodiment of the present invention, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more of the curable compound is composed of (d1) a (meth)acrylate having a bisphenol skeleton and an oxyalkylene group, and (d2) an alkyl glycol di(meth)acrylate.

[0084] As the above-mentioned epoxy compound, an epoxy resin having an epoxy group in the molecule is used. Examples thereof include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, bisphenol AD type epoxy resin, hydrogenated bisphenol type epoxy resin, 1,2-butanediol diglycidyl ether, 1,3-butanediol diglycidyl ether, 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, 2,3-butanediol diglycidyl ether, 1,5-pentanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,4-cyclohexanedimethanol diglycidyl ether, phenol novolac type epoxy resin, cresol novolac type epoxy resin, N,N-diglycidyl-4-glycidyloxyaniline, 4,4'-methylenebis(N,N-diglycidylaniline), tetraglycidyl diaminodiphenylmethane, tetraglycidyl-m-xylylenediamine, naphthalene type epoxy resin, 1,2-epoxy-3-methyloxyphenylpropane, 1,4-butanediol diglycidyl ether, n-butyl glycidyl ether, allyl glycidyl ether, 2-ethylhexyl glycidyl ether, styrene oxide, phenyl glycidyl ether, tolyl glycidyl ether, p-sec-butylphenyl glycidyl ether, glycidyl methacrylate, tert-butylphenyl glycidyl ether, diglycidyl ether, (poly)ethylene glycol glycidyl ether, butanediol glycidyl ether, trimethylolpropane triglycidyl ether, 1,6-hexanediol diglycidyl ether, etc., but are not limited thereto.

[0085] As the substance constituting the microcapsule wall, a conventionally well-known substance can be used. Gelatin, aldehyde resin or urea resin is used. Here, as the aldehyde resin, urea-formaldehyde resin, melamine-formaldehyde resin, etc. can be cited, and as the urea resin, polyurea resin, polyurethane resin, etc. can be cited. It should be noted that the mass ratio of the curable compound to the wall is not particularly limited, but is, for example, 95:5 to 10:90. According to one embodiment of the present invention, the mass ratio of the curable compound to the wall is 95:5 to 40:60, 95:5 to 60:40, or 95:5 to 70:30.

[0086] The average particle diameter of the above-mentioned microcapsules can be adjusted to a desired value by adjusting the stirring speed, stirring time, etc. In the present invention, it is preferably 50 to 500 μm, more preferably 100 to 300 μm, and further preferably 120 to 200 μm. By being within the above range, an aqueous composition for a thread member film having excellent adhesion force can be obtained even though it is an aqueous composition. It should be noted that the average particle diameter is photographed using a scanning electron microscope, the particle diameter is measured, and the average value thereof is used as the average particle diameter.

[0087] The above-mentioned component (D) can be produced by using publicly known microencapsulation methods, interfacial polymerization methods, in-situ synthesis methods (in-situ methods), insolubilization precipitation methods, coagulation methods, etc. It can be produced by using the methods described in Japanese Patent Application Laid-Open No. 2000-15087, etc., and the disclosure content thereof is incorporated herein by reference in its entirety.

[0088] The addition amount of the component (D) of the present invention is preferably 5 to 95% by mass, more preferably 10 to 80% by mass, and particularly preferably 20 to 60% by mass based on the whole composition. In one embodiment of the present invention, the addition amount of the component (D) is 25 to 55% by mass, 30 to 50% by mass, or 35 to 45% by mass based on the whole composition.

[0089] In addition, the addition amount of the component (D) of the present invention is preferably 5 to 150 parts by mass, more preferably 15 to 100 parts by mass, and particularly preferably 30 to 80 parts by mass based on 10 parts by mass of the solid component of the above-mentioned component (A). In one embodiment of the present invention, the addition amount of the component (D) of the present invention is 40 to 75 parts by mass or 50 to 70 parts by mass based on 10 parts by mass of the solid component of the above-mentioned component (A).

[0090] In addition, the addition amount of the curable compound encapsulated in the component (D) of the present invention is preferably 3 to 130 parts by mass, more preferably 12 to 90 parts by mass, further preferably 25 to 70 parts by mass, still further preferably 30 to 70 parts by mass, still further preferably 35 to 60 parts by mass, or still further preferably 40 to 50 parts by mass based on 10 parts by mass of the solid component of the above-mentioned component (A). By making the above-mentioned component (D) within the above range, a water-based composition for a thread member film that is a water-based composition but can achieve high visibility and has excellent adhesion can be further obtained.

[0091] <Component (E)>

[0092] Furthermore, in order to impart curability to the water-based composition for a thread member film of the present invention, as the component (E), microcapsules encapsulating a curing agent that reacts with the curable compound contained in the microcapsules of the above-mentioned component (D) can be contained. There is no particular limitation as long as it is a substance that cures the above-mentioned curable compound. In the case where the above-mentioned curable compound is a (meth)acrylate compound, peroxides, etc. can be mentioned, and in the case where the above-mentioned curable compound is an epoxy compound, amine compounds, thiol compounds, imidazole compounds, etc. can be mentioned. Among them, peroxides are preferred. They can be used alone or two or more of them can be used in combination.

[0093] When the curable compound used in (D) of the present invention is a (meth)acrylate compound, as the component (E), peroxides can be exemplified. As the above peroxides, cumene hydroperoxide, tert-butyl hydroperoxide, p-hydroperoxide such as p-menthane, etc. can be exemplified. Hydroperoxides such as diisopropylbenzene hydroperoxide, dicumyl peroxide, tert-butyl cumyl peroxide, di-tert-butyl peroxide and other diallyl peroxide compounds, methyl ethyl ketone peroxide, cyclohexane peroxide, methyl cyclohexane peroxide and other ketone peroxide compounds, benzoyl peroxide, lauroyl peroxide, acetyl peroxide and other diacyl peroxide compounds, tert-butyl peroxybenzoate, tert-butyl peroxyacetate, tert-butyl peroxybenzoate and other peroxyester compounds, etc. In particular, in the present invention, diacyl peroxide compounds are suitable. Among them, since it is an aqueous composition but has excellent adhesion, benzoyl peroxide is suitable. They can be used alone or two or more of them can be used in combination. According to one embodiment of the present invention, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more of the peroxide is composed of benzoyl peroxide (upper limit: 100% by mass).

[0094] When the curable compound used in (D) of the present invention is an epoxy compound, as the component (E), chain aliphatic polyamines, cyclic aliphatic polyamines, aliphatic aromatic amines, aromatic amines, modified amines such as amine adducts, polyamide resins, imidazole compounds, mercapto compounds, acid anhydrides, etc. can be exemplified, and among them, mercapto compounds are preferred. They can be used alone or two or more of them can be used in combination.

[0095] As the above mercaptan compounds, pentaerythritol tetra(3-mercaptobutyrate), pentaerythritol tetra(3-mercaptopropionate), trimethylolpropane tri(3-mercaptobutyrate), trimethylolethane tri(3-mercaptobutyrate), 1,3,5-tris(3-mercaptobutyloxyethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, etc. can be exemplified.

[0096] As the method for producing the microcapsules of the above component (E), known techniques can be used, and interfacial polymerization, in-situ polymerization, insolubilization precipitation method, coacervation method, etc. can be used for production, but in the present invention, microcapsules produced by in-situ polymerization are particularly suitable for use.

[0097] The production of the above microcapsules can be carried out by a known conventional method described in, for example, Japanese Patent Laid-Open No. 04-048926, Japanese Patent Laid-Open No. 53-84881, Japanese Patent Publication No. 52-18671, Japanese Patent Publication No. 44-27257, etc. The entire disclosure of these documents is incorporated herein by reference. As the wall material of the above microcapsules, urea-formaldehyde resin, melamine-formaldehyde resin, polyurea resin, polyurethane resin, etc. can be appropriately selected according to the purpose. It should be noted that the mass ratio of the curing agent to the wall is not particularly limited, but is, for example, 95:5 to 10:90.

[0098] The addition amount of the microcapsules encapsulating the curing agent of the above component (E) is preferably 0.1 to 95% by mass, more preferably 0.5 to 80% by mass, and particularly preferably 1 to 60% by mass based on the whole composition. According to one embodiment of the present invention, the addition amount of the microcapsules of the above component (E) is 1.2 to 50% by mass, 1.4 to 40% by mass, 1.6 to 30% by mass, 1.8 to 20% by mass, 2.0 to 10% by mass, 2.2 to 5% by mass, or 2.4 to 4% by mass based on the whole composition.

[0099] In addition, the addition amount of the capsules encapsulating the curing agent of the component (E) is preferably 0.1 to 100 parts by mass, more preferably 0.5 to 50 parts by mass, and particularly preferably 1 to 25 parts by mass based on 10 parts by mass of the solid component of the above component (A). In addition, the addition amount of the component (E) of the present invention is preferably 0.1 to 50 parts by mass, more preferably 0.3 to 20 parts by mass based on 10 parts by mass of the above component (D). According to one embodiment of the present invention, the addition amount of the component (E) of the present invention is 1 to 10 parts by mass, 2 to 8 parts by mass, or 3 to 6 parts by mass based on 10 parts by mass of the above component (D).

[0100] In addition, the addition amount of the curing agent encapsulated in the component (E) of the present invention is preferably 0.05 to 85 parts by mass, more preferably 0.4 to 45 parts by mass, still more preferably 0.6 to 22 parts by mass, still more preferably 0.8 to 18 parts by mass, still more preferably 1 to 13 parts by mass, still more preferably 1.5 to 9 parts by mass, or 2 to 6 parts by mass based on 10 parts by mass of the solid component of the above component (A). By making the above component (E) within the above range, a water-based composition for a thread member film that is a water-based composition but can achieve high visibility and has excellent adhesion can be further obtained.

[0101] <Any component>

[0102] Furthermore, in the present invention, within the range that does not impede the effects of the invention, additives such as solvents, fillers, curing accelerators, rust inhibitors, surfactants, plasticizers, dispersants, adhesion aids, preservatives, defoamers, wetting agents, emulsifiers, diluents, pH regulators, viscoelasticity regulators, and rheology regulators (rheology control agents) may be included, or the above additives may not be included.

[0103] Particularly when the aqueous composition for the film of the threaded member of the present invention is used for threaded members, by combining a suitable filler and a viscoelasticity regulator or a rheology control agent, the fixing force can be improved, and the anti-loosening effect after thread tightening can be further enhanced. When the selection of the filler is inappropriate, it may have an adverse effect on color development and fixing force.

[0104] There is no particular limitation on the above solvent, but examples thereof include water, alcohols, N-methyl-2-pyrrolidone, etc. Among them, water, which is the preferred solvent for the above components (A) and (B), is preferably used. Water is preferably ion-exchanged water.

[0105] The addition amount of water (including the water in components (A) and (B)) is not particularly limited, but is 5 to 95% by mass, more preferably 10 to 80% by mass, and particularly preferably 20 to 60% by mass relative to the whole composition. By making the addition amount of the above water within the above range, an aqueous composition for the film of a threaded member that can achieve high visibility and has excellent fixing force can be further obtained although it is an aqueous composition. It should be noted that the aqueous composition referred to here means a composition in a system where 50% by mass or more of the solvent is water. In addition, the solid content in the whole composition is 5 to 95% by mass, more preferably 20 to 90% by mass, and particularly preferably 40 to 80% by mass.

[0106] According to one embodiment of the present invention, 80% by mass or more, 90% by mass or more, 95% by mass or more, 98% by mass or more, or 99% by mass or more of the solvent contained in the composition is water (upper limit: 100%).

[0107] As the above filler, inorganic fillers and organic filler materials excluding components (B) and (C) of the present invention can be cited. As the inorganic filler, examples include silica, alumina, talc, calcium carbonate, glass, boron nitride, aluminum nitride, mica, kaolin, etc. Among them, silica, talc, and mica are preferred because they have high fixing force although they are aqueous compositions. As the above organic filler material, examples include polyethylene, polypropylene, polyamide, polystyrene, polycarbonate, polytetrafluoroethylene resin, etc. Among them, polytetrafluoroethylene resin is preferred. They can be used alone or two or more of them can be mixed, but it is preferred to mix two or more.

[0108] According to one embodiment of the present invention, the proportion of the filler contained in the composition is preferably 5 to 25% by mass, or 10 to 20% by mass. According to one embodiment of the present invention, the filler contains talc and mica. According to one embodiment of the present invention, the content of talc is 1.2 to 4.0 times, 1.4 to 3.0 times, or 1.6 to 2.5 times the content of mica in terms of the mass content. By making the content of talc more than that of mica, the fixing force can be improved. This is because mica is more slippery (layered structure), the friction during fastening is reduced, and as a result, the fastening can be made more firm. On the other hand, it is also preferable to contain talc in the following aspects. For example, when using a threaded component coated with an aqueous composition for a threaded component film in an engine compartment of a vehicle or the like, it can be placed in a high-temperature environment. Even in such a high-temperature environment, by containing talc in the aqueous composition for a threaded component film, the strength of its cured product (strength at high temperature) can be maintained.

[0109] According to one embodiment of the present invention, 80% by mass or more, 90% by mass or more, 95% by mass or more, 98% by mass or more, or 99% by mass or more of the inorganic filler contained in the composition contains at least one of talc and mica (upper limit: 100% by mass).

[0110] The above polytetrafluoroethylene resin functions as a coating film strength maintaining component in the aqueous composition for a threaded component film of the present invention. The average particle size of the above polytetrafluoroethylene resin is not particularly limited, but is 0.1 to 100 μm, and further 1 to 50 μm. In addition, there is no particular limitation on commercially available products of polytetrafluoroethylene resin, but examples thereof include Lubron L5, Lubron L5F (both are manufactured by Daikin Industries, Ltd.), TLP-10, TLP-10F-1 (both are products of Mitsui DuPont Fluorochemicals Co., Ltd. (now Mitsui-Chemie Fluoroproducts Co., Ltd.)), Fluon L169, Fluon L170, Fluon L171, Fluon L173J (both are manufactured by Asahi Glass Co., Ltd. (now AGC Inc.)), KTL-20N, KTL-10N, KTL-8N, KTL-4N, KTL-2N, KTL-450, KT-600M, KTL-610, KTL-620 (both are manufactured by Kitamura Co., Ltd.), etc.

[0111] As the above-mentioned curing accelerator, for example, ethylene thiourea, saccharin, N,N-dimethylaniline, N,N-dimethyl-p-toluidine, N,N-diethyl-p-toluidine, o-tolidine, p-tolyldiethanolamine, glycolic acid, lactic acid, malic acid, tartaric acid, citric acid, maleic acid, etc. can be cited. Among them, since it is an aqueous composition but has high fixing power, ethylene thiourea, saccharin, N,N-dimethylaniline, N,N-dimethyl-p-toluidine, p-tolyldiethanolamine are preferred. They can be used alone, or two or more of them can be used in combination. According to one embodiment of the present invention, as the curing accelerator, an aromatic amine such as p-tolyldiethanolamine is preferably contained. According to one embodiment of the present invention, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more of the curing accelerator is composed of aromatic amines (upper limit: 100% by mass). According to one embodiment of the present invention, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more of the aromatic amine is composed of p-tolyldiethanolamine (upper limit: 100% by mass).

[0112] According to one embodiment of the present invention, the aromatic amine has an alkylphenyl group and a hydroxyalkyl group. The carbon number of the alkyl group in the alkylphenyl group is preferably 1 to 4, or 1 to 3. The carbon number of the alkyl group in the hydroxyalkyl group is preferably 1 to 4, or 1 to 3.

[0113] According to one embodiment of the present invention, the content of the curing accelerator (especially the aromatic amine) in the composition is 0.01 to 5% by mass, 0.05 to 3% by mass, 0.1 to 1% by mass, or 0.1 to 0.8% by mass.

[0114] The aqueous composition for the thread member coating film is constituted by appropriately adjusting the amounts of the respective components so that their total is 100% by mass.

[0115] <Manufacturing method of the aqueous composition for the thread member coating film>

[0116] Regarding the manufacturing method of the aqueous composition for the thread member coating film, as long as it contains component (A): an aqueous binder and component (B): an aqueous emulsion having a surface tension of 15.5 to 80 mN / m containing a fluorescent pigment, there is no particular limitation. For example, component (A): a curable composition containing an aqueous binder or a non-curable composition containing an aqueous binder can be separately prepared, and the curable composition or the non-curable composition and component (B): an aqueous emulsion having a surface tension of 15.5 to 80 mN / m containing a fluorescent pigment are mixed using a suitable mixing device such as a three-one mixer, etc.

[0117] According to one aspect of the present invention, by mixing component (A): an aqueous binder and component (B): an aqueous emulsion having a surface tension of 15.5 to 80 mN / m and containing a fluorescent pigment, an aqueous composition for coating a threaded member can be obtained. According to one aspect of the present invention, there is also provided an aqueous composition for coating a threaded member obtained by mixing component (A): an aqueous binder and component (B): an aqueous emulsion having a surface tension of 15.5 to 80 mN / m and containing a fluorescent pigment. Regarding the description related to this aqueous composition for coating a threaded member, the above description can be applied.

[0118] <Use>

[0119] The aqueous composition for coating a threaded member of the present invention is an aqueous composition but can achieve high visibility and has excellent adhesion, so it is preferably used for threaded members.

[0120] <Threaded member>

[0121] Another aspect of the present invention relates to a threaded member coated with the aqueous composition for coating a threaded member. That is, the above aspect can also be said to relate to a threaded member in which at least a part of the threaded portion is covered with a film of the above aqueous composition for coating a threaded member. In this specification, "covered with the aqueous composition for coating a threaded member" means "covered with a dry film of the aqueous composition for coating a threaded member". As the threaded member, it is preferably that the area of the surface of the threaded portion covered with the film of the above aqueous composition for coating a threaded member is 50% or more, and more preferably the entire threaded portion is covered. In addition, the entire threaded member including the threaded portion is covered with a film of the aqueous composition for coating a threaded member.

[0122] Examples of the threaded member include screws, bolts, nuts, screws, etc., but are not particularly limited to these. In addition, the material of the above threaded member is not particularly limited, but examples include iron, aluminum, gold, stainless steel, SUS, etc., and in addition, it can be a material subjected to plating treatments such as zinc chromate plating.

[0123] In this specification, regarding the conditions of the drying process when producing a threaded member coated with the aqueous composition for coating a threaded member, the temperature is not particularly limited, but is preferably 15 to 150 °C, more preferably 20 to 120 °C. In addition, the time is not particularly limited, but is preferably 1 to 300 minutes, more preferably 3 to 120 minutes, and further preferably 5 to 60 minutes.

[0124] In the present invention, there is also provided a cured product obtained by drying and / or curing the aqueous composition for coating a threaded member. In addition, there is also provided a threaded member covered with the cured product.

[0125] Examples are given below to further illustrate the present invention in detail, but the present invention is not limited to these examples. It should be noted that operations, tests, etc. are carried out in an environment of 25°C and 55% RH unless otherwise specified.

[0126] Example

[0127] Evaluation and research were conducted on the examples and comparative examples.

[0128] <Preparation of Aqueous Composition for Coating Thread Components>

[0129] Take each component shown in Table 1 in the parts by mass shown in Table 1, and mix them with a three-in-one mixer for 30 minutes to obtain an aqueous composition for coating each thread component. It should be noted that the detailed addition amounts are based on Table 1, and all the values are shown in parts by mass.

[0130] <Method for Manufacturing Microcapsules Encapsulating Curable Compounds>

[0131] Mix using the following general formula:

[0132] [Chemical Formula 1]

[0133]

[0134] 100 parts by mass of ethoxylated bisphenol A dimethacrylate (BPE-80N manufactured by Shin-Nakamura Chemical Co., Ltd., with an average addition number of n + m being 2.3) represented by the following formula, and 100 parts by mass of 1,6-hexanediol diacrylate (Light Acrylate 1.6HX-A manufactured by Kyoeisha Chemical Co., Ltd.) represented by the following general formula. Relative to 90 parts by mass of the above mixture, add the following general formula as the wall material of the microcapsules:

[0135] [Chemical Formula 2]

[0136]

[0137] 100 parts by mass of 1,6-hexanediol diacrylate (Light Acrylate 1.6HX-A manufactured by Kyoeisha Chemical Co., Ltd.) represented by the following formula. Relative to 90 parts by mass of the above mixture, add the following general formula as the wall material of the microcapsules:

[0138] [Chemical Formula 3]

[0139]

[0140] 10 parts by mass of a biuret-modified product of methylene diisocyanate (manufactured by Sumitomo Bayer Urethane Co., Ltd. (currently manufactured by Sumitomo Covestro Urethane Co., Ltd.), Desmodur N3200) was mixed and stirred. 130 parts by mass of this mixture was added to 100 parts by mass of a 4% aqueous solution of an isobutene-maleic acid copolymer, mixed to disperse it, stirred under acidic conditions, and 53 parts by mass of a 50% aqueous solution of a melamine-formaldehyde initial condensate (product of Nippon Carbide Industries Co., Ltd., Nikaresin) was dropped therein, followed by continued mixing and stirring. Thereafter, by drying it, a microcapsule (D) component encapsulating a curable compound was produced. Note that the average particle diameter of the microcapsule encapsulating the curable compound was 150 μm.

[0141] <Method for producing base liquid>

[0142] As the liquid (hereinafter also referred to as "base liquid" in this specification) serving as the basis for dispersing the above microcapsules, to ion-exchanged water (50 parts by mass) as a dispersion medium, the following were added respectively:

[0143] 30 parts by mass (=12.9 parts by mass of solid content = approximately 28.71% by mass of the total solid content in the base liquid) of an acrylic-styrene copolymer emulsion (manufactured by Showa Denko K.K. (currently manufactured by Resonac Holdings Corporation), Polysol AP-3160A) having a solid content of 43% as component (A),

[0144] 0.4 parts by mass of p-tolyldiethanolamine as a curing accelerator (approximately 0.89% by mass of the total solid content in the base liquid),

[0145] 20 parts by mass of talc as a filler (approximately 44.5% by mass of the total solid content in the base liquid),

[0146] 10 parts by mass of mica as a filler (approximately 22.3% by mass of the total solid content in the base liquid),

[0147] 1 part by mass of a rheology control agent (urea urethane oligomer) (approximately 2.2% by mass of the total solid content in the base liquid), and

[0148] 1 part by mass (=0.62 part by mass of solid content = approximately 1.4% by mass of the total solid content in the base liquid) of a colorant of cobalt blue dispersed in water having a solid content of 62% as component (C) (MF-5460 manufactured by Dainichi Seika Kogyo Co., Ltd. (made of composite oxide)) were mixed and stirred to obtain a base liquid (112.4 parts by mass).

[0149] <Method for manufacturing curable composition>

[0150] Next, the method for manufacturing the curable composition described in Table 1 will be described.

[0151] Add 140 parts by mass of the above base liquid containing component (A) and component (C) (solid component of component (A): about 16.07 parts by mass, solid component of component (C): about 0.77 parts by mass),

[0152] 100 parts by mass of the above microcapsules encapsulating a curable compound (average particle diameter: 30 μm) as component (D),

[0153] and 7 parts by mass of a substance having a wall material containing a urea - resorcinol - formaldehyde reaction product and encapsulating a curing agent as component (E), with benzoyl peroxide as the content (5.95 parts by mass of benzoyl peroxide and 1.05 parts by mass of the wall material (urea wall film agent)) in 7 parts by mass, and mix and stir uniformly to obtain a curable composition (247 parts by mass).

[0154] That is, in 100 parts by mass of the curable composition, the solid component of component (A) is about 6.51 parts by mass, the solid component of component (C) is about 0.32 parts by mass, the component (D) is about 40.49 parts by mass, and the component (E) is about 2.83 parts by mass (the amount of the curing agent in component (E) is about 2.41 parts by mass).

[0155] <Method for manufacturing non - curable composition>

[0156] Next, the method for manufacturing the non - curable composition described in Table 1 will be described.

[0157] Add 59 parts by mass of polytetrafluoroethylene resin (KT - 600M manufactured by Kitamura Co., Ltd.) with an average particle diameter of 15 μm as a filler,

[0158] 36 parts by mass of an acrylic - styrene copolymer emulsion (Polysol AP - 3160A manufactured by Showa Denko K.K.) with a solid content of 43% as a binder of component (A),

[0159] 50 parts by mass of ion - exchanged water, and

[0160] 1 part by mass of titanium oxide with a solid content of 99% (=solid component: 0.99 parts by mass) (0.1 part by mass is H2O) as a colorant of component (C), and mix and stir uniformly to manufacture a non - curable composition (146 parts by mass).

[0161] That is to say, in 100 parts by mass of the non-curing composition, the solid content of component (A) is about 10.6 parts by mass, and the solid content of component (C) is about 0.68 parts by mass.

[0162] <Component (B) and comparative components>

[0163] B1: An aqueous emulsion-type organic fluorescent pigment containing resin particles with an average particle size of 0.1 μm (surface tension 16.7 mN / m, solid content ratio 36.4% by mass, viscosity 17.3 mPa·s, pH 5.27) (MLCB12 manufactured by Shinloihi Co., Ltd.), and the resin particles contain a substance that emits fluorescent green light;

[0164] B2: An aqueous emulsion-type organic fluorescent pigment fluorescent blue containing resin particles with an average particle size of 0.1 μm (surface tension 24.8 mN / m, solid content ratio 36.2% by mass, viscosity 13.6 mPa·s, pH 5.11) (MLCB18 manufactured by Shinloihi Co., Ltd.), and the resin particles contain a substance that emits fluorescent blue light;

[0165] B’1: An aqueous emulsion-type organic fluorescent pigment fluorescent red containing resin particles with an average particle size of 0.1 μm (surface tension 15.2 mN / m, solid content ratio 36.8% by mass, viscosity 15.0 mPa·s, pH 5.32) (MLCB13 manufactured by Shinloihi Co., Ltd.), and the resin particles contain a substance that emits fluorescent red light.

[0166] It should be noted that the surface tension is measured by the plate method.

[0167] Next, the following evaluation studies were conducted on the examples and comparative examples.

[0168] <Method for manufacturing threaded components>

[0169] The threaded surfaces of hexagon bolts (M10×P1.5) made of SS41 conforming to JIS B 1180:2014 were immersed in each of the examples and comparative examples, and then only the top parts of the above-mentioned threaded surfaces were cleaned with clean water. Thereafter, the bolts were left standing at room temperature for 1 hour with the heads of the bolts held upward to allow the excess composition liquid to drip off. Then, it was further left standing in a constant temperature bath at 80°C for 20 minutes to volatilize and dry the volatile components, thereby manufacturing bolts with a composition film formed on the threaded surfaces (hereinafter also referred to as "film-forming bolts").

[0170] The film-forming bolts manufactured by the above method were evaluated for their characteristics by the following test methods.

[0171] <Appearance confirmation under fluorescent lamp environment>

[0172] Visually evaluate the appearance of each of the above-described film-forming bolts, that is, confirm the color rendering under a fluorescent lamp environment. The results of the appearance colors are shown in Table 1.

[0173] <Fluorescent color rendering confirmation>

[0174] For each of the above-described film-forming bolts, use an ultraviolet irradiation device (CHROMATO-VUE, manufactured by ULTRA-VIOLET PRODUCTS) to irradiate ultraviolet rays (365 nm), and visually evaluate the fluorescent color rendering of the test piece based on the following evaluation criteria. The results are shown in Table 1. In the present invention, ○ or ◎ is preferred.

[0175] [Evaluation results]

[0176] ◎... Strong fluorescent color rendering was confirmed.

[0177] ○... Weak fluorescent color rendering was confirmed.

[0178] ×... Fluorescent color rendering was not confirmed.

[0179] <Adhesion strength>

[0180] Pass the above-described film-forming bolts coated with Examples 1 and 2 and Comparative Examples 1 and 2 through flat washers (equivalent products conforming to JIS B1256: 2008 standard, M10), and then tighten the matching nuts (nuts made of SS41 conforming to JIS B1181: 2014, M10) with a tightening torque of 30 N·m, thereby causing the destruction of the microcapsules and the accompanying curing reaction, and leaving them standing at room temperature for 24 hours to produce test pieces for evaluating the adhesion strength.

[0181] Mount the bolt head of this test piece on a screw tightening measuring machine (NST-100NM, manufactured by Nippon Metersystem Co., Ltd.), rotate the nut in the loosening direction, and measure the torque (breaking torque) at the first movement of the nut as the adhesion strength, and evaluate it according to the evaluation criteria. The results are shown in Table 1. In the present invention, the breaking torque is preferably 35 N·m or more, more preferably 37 N·m or more, further preferably 40 N·m or more, and further preferably 45 N·m or more. It should be noted that "not measured" in the table means that this evaluation was not performed.

[0182] [Table 1]

[0183]

[0184] From Examples 1 and 2 in Table 1, it can be confirmed that the aqueous composition for coating threaded components of the present invention, although being a curable and aqueous composition, can achieve high visibility and has excellent adhesion. Additionally, from Examples 3 and 4 above, it can be confirmed that the aqueous composition for coating threaded components of the present invention, although being a non-curable and aqueous composition, can achieve high visibility.

[0185] Comparative Example 1 in Table 1 is an aqueous composition for coating threaded components that does not contain component (B) of the present invention, but it was confirmed that the visibility deteriorated. Additionally, Comparative Example 2 is an aqueous composition for coating threaded components that contains component B'1 which is not component (B) of the present invention, but it was confirmed that both the visibility and adhesion deteriorated. Comparative Example 1 is an aqueous composition for coating threaded components that does not contain component (B) of the present invention, but it was confirmed that the visibility deteriorated. Additionally, Comparative Example 3 is an aqueous composition for coating threaded components that does not contain component (B) of the present invention, but it was confirmed that the visibility deteriorated. Additionally, Comparative Example 4 is an aqueous composition for coating threaded components that contains component B'1 which is not component (B) of the present invention, but it was confirmed that the visibility deteriorated.

[0186] In summary, by combining (A) and (B) of the present invention, an aqueous composition for coating threaded components that can achieve high visibility although being an aqueous composition can be provided.

[0187] Industrial Applicability

[0188] The present invention is an aqueous composition for coating threaded components that can achieve high visibility although being an aqueous composition, so by being used for components having threaded portions such as screws, bolts, nuts, and screws, it is a useful substance that can prevent leakage of enclosed grease, gas, water, etc.

[0189] It should be noted that this application is based on Japanese Patent Application No. 2022-199774 filed on December 14, 2022, and the entire content disclosed therein is incorporated herein by reference.

Claims

1. An aqueous composition for coating a threaded component, wherein, Containing (A) component: an aqueous binder, and (B) component: an aqueous emulsion having a surface tension of 15.5 to 80 mN / m and containing a fluorescent pigment.

2. The aqueous composition for coating a threaded component according to claim 1, wherein the (B) component is an aqueous emulsion containing resin particles, and the resin particles contain a substance that emits fluorescent green light or fluorescent blue light.

3. The aqueous composition for coating a threaded component according to claim 1 or 2, wherein the (A) component is selected from at least one or more of the group consisting of (meth)acrylic polymer emulsions, (meth)acrylic acid-styrene copolymer emulsions, and ethylene-vinyl acetate copolymer emulsions.

4. The aqueous composition for coating a threaded component according to claim 1 or 2, wherein the aqueous composition for coating a threaded component further contains a (C) component: a non-fluorescent colorant.

5. The aqueous composition for coating a threaded component according to claim 1 or 2, wherein the aqueous composition for coating a threaded component further contains a (D) component: microcapsules encapsulating a curable compound.

6. The aqueous composition for coating a threaded component according to claim 5, wherein the aqueous composition for coating a threaded component further contains an (E) component: microcapsules encapsulating a curing agent.

7. The aqueous composition for coating a threaded component according to claim 1 or 2, wherein the addition amount of the solid component of the (B) component is 0.05 to 10 parts by mass with respect to 10 parts by mass of the solid component of the (A) component.

8. The aqueous composition for coating a threaded component according to claim 1 or 2, wherein the viscosity of the (B) component is 14 mPa·s or more.

9. The aqueous composition for coating a threaded component according to claim 8, wherein the pH of the (B) component is 5.15 to 5.

30.

10. The aqueous composition for coating a threaded component according to claim 9, wherein the aqueous composition for coating a threaded component contains talc and mica.

11. The aqueous composition for coating a threaded component according to claim 10, wherein the content mass of talc is 1.2 to 4.0 times the content mass of mica.

12. A cured product, wherein it is obtained by drying and / or curing the aqueous composition for coating a threaded component according to claim 1 or 2.

13. A threaded component, wherein at least a part of it is covered with the aqueous composition for coating a threaded component according to claim 1 or 2.

14. A threaded component, wherein at least a part of it is covered with the cured product according to claim 12.

15. An aqueous composition for coating a threaded component, wherein, Obtained by mixing the following components (A) component: an aqueous binder, and (B) component: an aqueous emulsion containing a fluorescent pigment and having a surface tension of 15.5 to 80 mN / m.

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