Cleaning agent composition and coating agent composition

Abstract

The present invention provides a cleaning agent composition or a coating agent composition having excellent anti-rust properties. The present disclosure pertains to a cleaning agent composition having a pH of 8.0-11.0, which contains component (A): an aqueous alkaline solution and component (B): sodium benzoate, or a coating agent composition having a pH of 8.0-11.0, which contains component (A): an aqueous alkaline solution, component (B): sodium benzoate, and component (C): latex particles.

Description

TECHNICAL FIELD

[0001] The present application relates to a water-based cleaner composition and a water-based coating composition. BACKGROUND

[0002] Sodium benzoate is well known as a rust preventive. Patent Literature 1 describes that by incorporating a sodium benzoate aqueous solution, after adjusting the pH of the solution to be acidic, into a base material, a gas-phase rust preventive film is formed, and thus a metal member or the like is prevented from rusting. However, in the case of a processed metal member, if contamination such as oil or dust is not removed, the risk of rusting of the metal member itself is not reduced, and thus cleaning of the metal member is particularly important from the viewpoint of so-called rust prevention. Furthermore, the metal member is subjected to rust prevention treatment by using a coating agent after cleaning.

[0003] Patent Literature 1: Japanese Patent Application Publication No. 2015-78410 SUMMARY

[0004] However, in the past, a cleaner or a coating agent used when a metal member is cleaned or coated has had a tendency to deteriorate slowly over time, and it has been difficult to continue using the same formulation (cleaner or coating agent) for a long period of time. In addition, in the case of cleaning treatment or coating treatment using a conventional cleaner or coating agent, rusting occurs in a short period of time (for example, after 1 day of treatment), and rust prevention performance is not sufficient. Therefore, a cleaner or a coating agent having sufficient rust prevention effect is desired.

[0005] The present inventors and others have conducted intensive research in order to achieve the above object, and as a result, have found a method related to a water-based cleaner composition and a water-based coating composition, and thus have completed the present application.

[0006] The gist of the present application is described below. The first embodiment of the present application is a cleaner composition containing the following (A) component and (B) component, and having a pH of 8.0 to 11.0.

[0007] (A) component: an alkaline aqueous solution

[0008] (B) component: sodium benzoate

[0009] In the case of the cleaner composition described in the first embodiment, the pH of the aforementioned (A) component in the second embodiment of the present application is 9.0 to 12.0.

[0010] The third embodiment of the present application is a coating composition containing the following (A) to (C) components, and having a pH of 8.0 to 11.0.

[0011] (A) component: an alkaline aqueous solution

[0012] (B) component: sodium benzoate

[0013] (C) Component: Latex particles

[0014] In the fourth embodiment of the present application, the pH of the aforementioned (A) component in the coating agent composition described in the third embodiment is 9.0 to 12.0.

[0015] In the fifth embodiment of the present application, the coating agent composition described in the third or fourth embodiment further contains a surfactant.

[0016] In the sixth embodiment of the present application, the aforementioned surfactant in the coating agent composition described in the fifth embodiment is a nonionic surfactant.

[0017] In the seventh embodiment of the present application, the aforementioned nonionic surfactant in the coating agent composition described in the sixth embodiment is a polyoxyethylene-based nonionic surfactant.

[0018] In the eighth embodiment of the present application, the aforementioned (C) component in the coating agent composition described in any of the third to seventh embodiments is latex particles containing a (meth)acrylic polymer.

[0019] The ninth embodiment of the present application is a metal member cleaning method, which includes a cleaning step of immersing a metal member in the cleaning agent composition described in the first or second embodiment and irradiating ultrasonic waves.

[0020] The tenth embodiment of the present application is a metal member coating method, which includes a coating step of immersing a metal member in the coating agent composition described in the third to eighth embodiments, or immersing and irradiating ultrasonic waves, and a drying step of drying the aforementioned metal member after the aforementioned coating step.

[0021] The eleventh embodiment of the present application is a metal member rust prevention method, which includes a cleaning step of immersing a metal member in the cleaning agent composition described in the first or second embodiment, or immersing and irradiating ultrasonic waves, a coating step of immersing the aforementioned metal member in the coating agent composition described in the third to eighth embodiments and irradiating ultrasonic waves after the aforementioned cleaning step, and a drying step of drying the aforementioned metal member after the aforementioned coating step.

[0022] The twelfth embodiment of the present application is a metal member cleaning method described in the ninth embodiment, in which the metal member is a threaded fitting member.

[0023] The thirteenth embodiment of the present application is a metal member coating method described in the tenth embodiment, in which the metal member is a threaded fitting member.

[0024] The fourteenth embodiment of the present application is a rust-preventing method for a metal member that is a threaded mounting member, according to the eleventh embodiment.

[0025] Effects of the Invention

[0026] According to the present application, a cleaning agent composition or an application agent composition that can be used for a long period of time and has excellent rust-preventing properties is provided. DETAILED DESCRIPTION

[0027] The following describes modes for carrying out the present application in detail. The embodiments shown herein are modes exemplifying the technical idea of the present application and do not limit the present application. Thus, other modes, methods of use, and application technologies that can be carried out by those skilled in the art and the like within the scope of the gist of the present application are all included in the scope and gist of the present application, and the scope equivalent to the scope of protection of the present application is also included therein. The embodiments described in the present specification can be combined in any manner to become other embodiments. In the present specification, "X to Y" means "X or more and Y or less", and "weight" and "mass", "wt%" and "mass%", and "weight parts" and "mass parts" are regarded as the same meaning. In the present specification, "A and / or B" includes A or B, and a mode in which A and B are combined. In the present specification, the term "(meth)acryl" includes both acryl and methacryl. Thus, for example, the term "(meth)acrylic acid" includes both acrylic acid and methacrylic acid. Similarly, the term "(meth)acrylate" includes both acrylate and methacrylate, and the term "(meth)acrylamide" includes both acrylamide and methacrylamide. In the present specification, unless otherwise specified, operations and measurement of physical properties and the like are performed under the conditions of room temperature (20°C or higher and 25°C or lower) / relative humidity of 40% RH or higher and 50% RH or lower.

[0028] <Cleaning agent composition>

[0029] One embodiment of the present application is a cleaning agent composition containing the following (A) component and (B) component and having a pH of 8.0 to 11.0:

[0030] (A) component: an aqueous alkali solution

[0031] (B) component: sodium benzoate.

[0032] The cleaner composition thus configured can inhibit rusting of the metal member after cleaning. For example, even in the case where heating and drying are performed after cleaning with the cleaner composition, rusting of the metal member can be inhibited. In addition, the cleaner composition of the present embodiment has high stability and can be stored and used for a long period of time. Thus, the coating agent composition of one embodiment of the present application can inhibit deterioration of the cleaner composition when cleaning a processed metal member such as a bolt, and the same liquid can be used for a long period of time.

[0033] <Coating agent composition>

[0034] Another embodiment of the present application is a coating agent composition containing the following (A) to (C) components and having a pH of 8.0 to 11.0:

[0035] (A) Component: Alkaline aqueous solution

[0036] (B) Component: Sodium benzoate

[0037] (C) Component: Latex particles

[0038] The coating agent composition thus configured can inhibit rusting of the metal member after coating. For example, even in the case where heating and drying are performed after coating, rusting of the metal member can be inhibited. In addition, the coating agent composition of the present embodiment has high stability and can be stored and used for a long period of time. Thus, the coating agent composition of one embodiment of the present application can inhibit deterioration of the coating agent composition when coating a processed metal member such as a bolt, and the same liquid can be used for a long period of time. In addition, the coating agent composition of one embodiment of the present application does not cause rusting of the metal member even when heating and drying are performed.

[0039] In general, when a metal member is cleaned with a water-based cleaner, rusting of the metal member occurs when drying is performed after cleaning. As described above, the cleaner composition and the coating agent composition according to one embodiment of the present application can remove dirt (cutting oil and the like) even when the composition is a water-based composition, and rusting does not occur even when drying is performed after cleaning. In addition, the coating agent composition according to another embodiment of the present application forms a uniform coating film on the surface of the adherend, and rusting does not occur even when the coating film is left for a long period of time after coating. In addition, conventional cleaners and coating agents have low stability of the liquid, and the liquid deteriorates slowly when the use period is extended, and it is difficult to use the liquid for a long period of time. The cleaner composition and the coating agent composition according to one embodiment of the present application have high stability of the liquid, and the state of the liquid does not change even when the use period is extended, and the liquid can be used for a long period of time.

[0040] The (A) component and (B) are common to the cleaning agent composition as one embodiment of the present application, and the coating agent composition as another embodiment of the present application. Hereinafter, regarding the (A) component and (B) component, and other components (additives, etc.), unless otherwise specified, they can be applied to the cleaning agent composition and the coating agent composition. Thus, hereinafter, as "the composition according to the present embodiment", the cleaning agent composition and the coating agent composition are included. For the description of either one of the cleaning agent composition or the coating agent composition, it is described as "the cleaning agent composition according to the present embodiment" or "the coating agent composition according to the present embodiment".

[0041] (A) component

[0042] The composition according to the present embodiment contains an alkaline aqueous solution as the (A) component. Here, the alkaline aqueous solution as the (A) component can be a composition containing an alkaline compound and water. As the (A) component (alkaline aqueous solution) that can be used in the composition according to the present embodiment, there can be mentioned an aqueous solution in which an alkaline compound is mixed in water such as ion-exchanged water, distilled water, tap water, and the like, and an alkaline electrolyzed water.

[0043] The alkaline aqueous solution is an aqueous solution having a pH of more than 7.0, preferably a pH of 7.5 to 12.0, more preferably a pH of 8.0 to 12.0, and further preferably a pH of 9.0 to 12.0. Thus, based on one embodiment, the (A) component (alkaline aqueous solution) is an alkaline aqueous solution having a pH of 9.0 to 12.0. In addition, based on one embodiment, the (A) component (alkaline aqueous solution) is an alkaline aqueous solution having a pH of 9.5 to 11.5, an alkaline aqueous solution having a pH of 10.0 to 11.5, or an alkaline aqueous solution having a pH of 10.5 to 11.5.

[0044] Based on one embodiment, the (A) component (alkaline aqueous solution) is an alkaline electrolyzed water. Thus, the (A) component (alkaline aqueous solution) is preferably an alkaline electrolyzed water having a pH of more than 7.0, more preferably an alkaline electrolyzed water having a pH of 7.5 to 12.0, further preferably an alkaline electrolyzed water having a pH of 8.0 to 12.0, and particularly preferably an alkaline electrolyzed water having a pH of 9.0 to 12.0. Based on one embodiment, the (A) component (alkaline aqueous solution) is an alkaline electrolyzed water having a pH of 9.5 to 11.5, an alkaline electrolyzed water having a pH of 10.0 to 11.5, or an alkaline electrolyzed water having a pH of 10.5 to 11.5.

[0045] (A) component can be used as a cleaner composition or an application agent composition by being combined with the (B) component described later. The (A) component is an aqueous alkaline solution having a pH of more than 7.0 or 7.5 to 12.0 (preferably a pH of 8.0 to 12.0, more preferably a pH of 9.0 to 12.0, further preferably a pH of 9.5 to 11.5, particularly preferably a pH of 10.0 to 11.5, most preferably a pH of 10.5 to 11.5) or alkaline electrolytic water having a pH of more than 7.0 or 7.5 to 12.0 (preferably a pH of 8.0 to 12.0, more preferably a pH of 9.0 to 12.0, further preferably a pH of 9.5 to 11.5, particularly preferably a pH of 10.0 to 11.5, most preferably a pH of 10.5 to 11.5) in terms of the cleaner composition or the application agent composition, and can inhibit deterioration of the liquid, can be used for a long period of time, and can further exert rust-preventive properties.

[0046] The detailed mechanism by which the (A) component has the above-described effects is not clear, but it is presumed that the (A) component is the environment in which the rust-preventive properties of the (B) component are most exerted in the composition according to the present embodiment. In addition, it is presumed that the (A) component causes dirt to be effectively removed from the metal member and can cause the dirt to stably exist in the liquid, inhibiting the generation of agglomerates, whereby the composition can be used for a long period of time.

[0047] The (A) component (aqueous alkaline solution) can be, for example, an aqueous solution containing an alkaline compound having a pH of more than 7.0 or 7.5 to 12.0 (preferably a pH of 8.0 to 12.0, more preferably a pH of 9.0 to 12.0, further preferably a pH of 9.5 to 11.5, particularly preferably a pH of 10.0 to 11.5, most preferably a pH of 10.5 to 11.5). As the alkaline compound at this time, a nitrogen-containing organic or inorganic alkaline compound, a hydroxide of an alkali metal or an alkaline earth metal, various carbonates, bicarbonates, and the like can be used. For example, a hydroxide of an alkali metal, a quaternary ammonium hydroxide or a salt thereof, ammonia, an amine, and the like can be given. As the hydroxide of an alkali metal, for example, potassium hydroxide, sodium hydroxide, and the like can be given. As the carbonate or bicarbonate, for example, ammonium bicarbonate, ammonium carbonate, potassium bicarbonate, potassium carbonate, sodium bicarbonate, sodium carbonate, and the like can be given. As the quaternary ammonium hydroxide or salt thereof, for example, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrabutylammonium hydroxide, and the like can be given. As the amine, for example, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, ethylenediamine, monoethanolamine, N-(β-aminoethyl)ethanolamine, hexanediamine, diethylenetriamine, triethylenetetramine, and the like can be given.

[0048] As a basic compound, ammonia, potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, ammonium bicarbonate, ammonium carbonate, potassium bicarbonate, potassium carbonate, sodium bicarbonate, and sodium carbonate can be given as preferable examples from the viewpoint of rust prevention and the like. As a more preferable compound, ammonia, potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, and tetraethylammonium hydroxide can be given as examples. Such a basic compound can be used alone or in combination with two or more.

[0049] As the (A) component, for example, an aqueous basic solution having a pH of 9.0 to 12.0 can be obtained by adjusting the pH of ion-exchanged water with ammonia water.

[0050] The (A) component can be alkaline electrolyzed water. As the alkaline electrolyzed water, there is no particular limitation, and electrolyzed water generated by an electrolytic cell of a one-tank type, a two-tank type, or a three-tank type can be used. The alkaline electrolyzed water is generated by electrolyzing water or an electrolyte aqueous solution in which an electrolyte is dissolved in water, and a substance manufactured by a publicly known electrolyzed water generating device can be appropriately used. As the electrolyzed water generating device, for example, an alkaline electrolyzed water generating device EW3000A manufactured by Amano Corporation, or a strong alkaline electrolyzed water generating system (ZK series) manufactured by Zao Sangyo Co., Ltd. can be used.

[0051] As the electrolyte used as the alkaline electrolyzed water, a publicly known electrolyte can be appropriately selected. In the case where an electrolytic cell of a one-tank type is used, for example, an electrolyte such as sodium bicarbonate, potassium bicarbonate, sodium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, or sodium metasilicate, which exhibits alkalinity (pH 8.5 to pH 14), can be appropriately used. In the case where an electrolytic cell of a two-tank type or a three-tank type is used, in addition to an electrolyte exhibiting the same alkalinity, for example, an electrolyte such as common salt, which exhibits neutrality (pH 5.5 to pH 8.5), can be appropriately used.

[0052] In the case where the (A) component is alkaline electrolyzed water, specifically, water or an electrolyte aqueous solution containing water and an electrolyte is electrolyzed by a manufacturing device for alkaline electrolyzed water, whereby water having a pH of more than 7.0 or 7.5 to 12.0 (preferably a pH of 8.0 to 12.0, more preferably a pH of 9.0 to 12.0, further preferably a pH of 9.5 to 11.5, particularly preferably a pH of 10.0 to 11.5, most preferably a pH of 10.5 to 11.5) (alkaline electrolyzed water) can be manufactured.

[0053] According to one embodiment, the (A) component has a pH of 9.3 to 12.0, 9.5 to 12.0, or 10.0 to 12.0.

[0054] As described above, in the case where the (A) component is an aqueous alkali solution having a pH of 7.5 to 12.0 (preferably a pH of 8.0 to 12.0, more preferably a pH of 9.0 to 12.0, further preferably a pH of 9.5 to 11.5, particularly preferably a pH of 10.0 to 11.5, most preferably a pH of 10.5 to 11.5), the pH can be in the above range, for example, by containing an alkali compound, or can be in the above range by using an alkaline electrolyzed water obtained by alkaline electrolysis of water or an electrolyte aqueous solution containing water and an electrolyte.

[0055] As described above, in the composition according to the present embodiment, the (A) component is preferably an aqueous alkali solution having a pH of 9.0 to 12.0, more preferably an alkaline electrolyzed water obtained by electrolysis of water or an electrolyte aqueous solution containing water and an electrolyte.

[0056] (B) component

[0057] The composition according to the present embodiment contains sodium benzoate as the (B) component. Sodium benzoate is used as a rust-preventive component. As a specific example of the (B) component, even if the reagent is sodium benzoate itself, it can be a composition containing sodium benzoate (rust-preventive agent). As the rust-preventive agent containing sodium benzoate, ASCOTRAN (registered trademark, hereinafter abbreviated as ASCOTRAN) HPB, ASCOTRAN AL-4, and the like manufactured by ASCOTEC Corporation (sold by GSI Creos Corporation) can be given, but the present embodiment is not limited to these.

[0058] The content of the (B) component in the composition according to the present embodiment is preferably 0.01 to 10.0 parts by mass, more preferably 0.03 to 8.0 parts by mass, further preferably 0.05 to 5.0 parts by mass, particularly preferably 0.08 to 4.0 parts by mass, and most preferably 0.1 to 3.0 parts by mass, relative to 100 parts by mass of the (A) component. According to one embodiment, the content of the (B) component in the composition according to the present embodiment can be 0.05 to 2.0 parts by mass, 0.05 to 1.5 parts by mass, 0.05 to 1.0 parts by mass, 0.08 to 1.5 parts by mass, 0.1 to 2.0 parts by mass, 0.1 to 1.5 parts by mass, or 0.1 to 1.0 parts by mass, relative to 100 parts by mass of the (A) component.

[0059] (C) component

[0060] The coating agent composition according to the present embodiment contains latex particles (resin latex) as the (C) component. The latex particles as the (C) component are dispersed in the composition. The (C) component is preferably particles of resin uniformly dispersed in water, and more preferably (meth)acrylic polymer or latex particles containing (meth)acrylic copolymer ((meth)acrylic resin latex). Note that the cleaning agent composition according to the present embodiment becomes the coating agent composition according to the present embodiment when the (C) component is contained.

[0061] The (C) component can be dispersed in a medium such as water and exist, and the latex particles (resin latex) are fused and adhered to form a film by drying of the medium. The coating (coating film) formed from the coating agent composition according to the present embodiment has good adhesion to metal parts by containing the (C) component. Thus, the coating agent composition according to the present embodiment can exhibit excellent rust prevention.

[0062] As the (C) component used in the coating agent composition according to the present embodiment, for example, commercially available (meth)acrylic resin latex (polymer acrylic latex) can be used, and resin latex containing at least a (meth)acrylic derivative or the like can be used. As the (meth)acrylic resin latex, (meth)acrylic polymer latex; ethylene / vinyl acetate / (meth)acrylic derivative copolymer latex, ethylene / (meth)acrylic derivative copolymer latex, poly(meth)acrylic derivative latex, styrene / (meth)acrylic derivative copolymer latex, vinyl acetate / (meth)acrylic derivative latex, and the like (meth)acrylic copolymer latex; and the like can be used. The (meth)acrylic derivative refers to acrylic acid and / or methacrylic acid, acid derivatives thereof, and the like, and contains at least one or more of these components. The latex particles (resin latex) can be self-crosslinking type or non-self-crosslinking type, but are preferably non-self-crosslinking type.

[0063] As specific examples of the above (meth)acrylic derivative, for example, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, and the like can be given. Among these, as the (C) component, (meth)acrylic resin latex containing (meth)acrylic copolymer or a polymer containing (meth)acrylate as a constituent monomer is preferred.

[0064] As specific examples of the component (C), there can be mentioned Newcoat series (Newcoat KSB-1, Newcoat SFK-1000A, Newcoat SFK-8000A) manufactured by Shin-Nakamura Chemical Industry Co., Ltd., JURYMER AC-10S (weight average molecular weight: about 5000), JURYMER AS-10SH (weight average molecular weight: about 1 million) manufactured by Dainippon Ink and Chemicals, Inc., ACRYSET ARL-468 (weight average molecular weight: about 4000), ACRYSET ARL-460 manufactured by Japan Catalyst Co., Ltd., Polysol AP-1761, Polysol AP-5595N, Polysol AP-4690N manufactured by Resonac Co., Ltd., Mowinyl 727, Mowinyl 7525, Mowinyl 745 manufactured by Japan Coating Resin Co., Ltd., and the like, but are not limited to these.

[0065] The glass transition temperature (Tg) of the emulsified polymer (cured product) of the latex particles (resin latex) is preferably -20°C or higher and 50°C or lower, more preferably -15°C or higher and 40°C or lower, further preferably -10°C or higher and 30°C or lower, particularly preferably -5°C or higher and 20°C or lower, and most preferably -5°C or higher and 10°C or lower. Thus, the coating (coating film) formed from the coating agent composition according to the present embodiment achieves excellent rust resistance.

[0066] The glass transition temperature Tg of the emulsified polymer of the latex particles (resin latex) refers to a value obtained by converting the glass transition temperature Tga (K) at an absolute temperature calculated from the following (Math. 1) into a Celsius temperature. Specifically, when the monomers constituting the emulsified polymer are represented as M1, M2, M3, ··· Mn, the glass transition temperatures (K) of the homopolymers obtained from each monomer are represented as Tg1, Tg2, Tg3, ··· Tgn, and the weight proportions (weight fractions) of the structural units derived from each monomer in the emulsified polymer are represented as W1, W2, W3, ··· Wn, the glass transition temperature Tg of the emulsified polymer can be calculated by (Math. 1) (FOX equation) shown below. Here, W1 + W2 + W3 + ··· + Wn = 1. Note that the details are described in Bulletin of the American Physical Society, Series 2, Vol. 1, No. 3, p. 123 (1956). In addition, the glass transition temperatures of the homopolymers of various monomers ((Tg1) to (Tgn)) used for calculation by the FOX equation can be, for example, values described in Painting and Coatings (published by the Coatings Industry Magazine, No. 358, 1982), and the like.

[0067] [Math. 1]

[0068]

[0069] Here, each Wi / Tgi (here, each i is a natural number of 1 to n) on the right side of the above formula 1 corresponds to each monomer Mi that constitutes the emulsion polymer. Thus, on the right side of the above formula 1, the number of Wi / Tgi is the same as the number of types of monomers that constitute the emulsion polymer (n when each i is 1 to n). Therefore, for example, when the (meth) acrylic-styrene copolymer is a 2-membered copolymer constituted by monomers M1 and M2, the above formula 1 becomes 1 / Tga = W1 / Tg1 + W2 / Tg2. In addition, for example, when the (meth) acrylic-styrene copolymer is a 3-membered copolymer constituted by monomers M1, M2, and M3, the above formula 1 becomes 1 / Tga = W1 / Tg1 + W2 / Tg2 + W3 / Tg3.

[0070] (C) Component must contain latex particles (preferably (meth) acrylic resin latex) and water, but can further contain a crosslinking agent, other components.

[0071] The latex particles (resin latex) can use a substance obtained by a publicly known production method, and can be produced, for example, by emulsion polymerization of a polymerizable monomer that is a raw material of a resin, using a polymerization initiator in the presence of an emulsifier, in water or an aqueous solvent.

[0072] As the emulsifier, a publicly known emulsifier can be used, and a surfactant, a protective colloid such as polyvinyl alcohol, and the like can be cited.

[0073] The content of the (C) component in the coating agent composition according to the present embodiment is preferably 0.1 to 20.0% by mass, more preferably 0.5 to 15.0% by mass, further preferably 0.8 to 13.0% by mass, further preferably 1.0 to 12.0% by mass, and most preferably 2.0 to 8.0% by mass, with respect to the total mass (100% by mass) of the coating agent composition. According to one embodiment, the content of the (C) component can be 1.0 to 10.0% by mass, 1.0 to 5.0% by mass, or 1.5 to 8.0% by mass, with respect to the total mass (100% by mass) of the coating agent composition. By the content of the (C) component being in the above range, the coating film formed from the coating agent composition becomes a thin and uniform coating film to the extent that it cannot be visually confirmed, and thus the rust-preventive property is improved.

[0074] Other components

[0075] The composition according to the present mode can further contain a surfactant. As the surfactant, an anionic surfactant containing an anionic group such as -SO3Na, -SO3NH4, etc. in the molecule, a nonionic surfactant which is a nonionic organic compound, a cationic surfactant containing a quaternary ammonium salt, an amphoteric surfactant containing an anionic group and a cationic group in the molecule can be given. The surfactant can be used alone or two or more kinds can be used in combination.

[0076] As examples of the anionic surfactant, polyoxyethylene alkyl ether acetate, polyoxyethylene alkyl sulfate, alkyl sulfate, polyoxyethylene alkyl ether sulfate, alkyl ether sulfate, alkyl benzene sulfonic acid, alkyl phosphate, polyoxyethylene alkyl phosphate, polyoxyethylene sulfosuccinic acid, alkyl sulfosuccinic acid, alkyl naphthalene sulfonic acid, alkyl diphenyl ether disulfonic acid, and salts thereof, etc. can be given.

[0077] As examples of the cationic surfactant, alkyl trimethyl ammonium salt, alkyl dimethyl ammonium salt, alkyl benzyl dimethyl ammonium salt, alkyl amine salt, etc. can be given.

[0078] As examples of the amphoteric surfactant, alkyl betaine, alkyl amine oxide, etc. can be given.

[0079] As examples of the nonionic surfactant, polyoxyalkylene alkyl ether such as polyoxyethylene alkyl ether, sorbitan fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene alkyl amine, alkyl alkanolamide, etc. can be given.

[0080] As the surfactant for the coating agent composition according to the present mode, a nonionic surfactant is preferred in terms of compatibility with the (C) component, a polyoxyethylene-based nonionic surfactant is more preferred, and a polyoxyethylene alkyl ether is particularly preferred. As the HLB (Hydrophilic-Lipophilic Balance) value of the nonionic surfactant, 8 to 16 is preferred, 9 to 15 is more preferred, and 10 to 14 is further preferred. As specific examples of the polyoxyethylene-based nonionic surfactant (polyoxyethylene alkyl ether), NOIGEN series (NOIGEN ET-65, NOIGEN ET-95, NOIGEN ET-115, NOIGEN ET-135, NOIGEN ET-165, etc.) manufactured by the First Industrial Pharmaceutical Co., Ltd., etc. can be given, but are not limited to these.

[0081] The content of the surfactant in the coating agent composition according to the present embodiment is preferably 0.01 to 5.0% by mass, more preferably 0.1 to 3.0% by mass, relative to the total mass (100% by mass) of the coating agent composition. If the content of the surfactant is 0.01% by mass or more, a more uniform coating film is formed, and if it is 5.0% by mass or less, the tackiness of the surface of the coating film is further suppressed.

[0082] The composition according to the present embodiment can contain an azole compound. The azole compound contains a 5-membered ring heterocyclic compound having one or more nitrogens and derivatives thereof. By containing the azole compound in the composition according to the present embodiment, the rust-preventive property is further improved. As the azole compound, a benzotriazole-based compound, a tolyltriazole-based compound, a thiadiazole-based compound, and an imidazole-based compound, and the like can be given. As the azole compound, for example, triazole, benzotriazole, 4-methylbenzotriazole, 5-methylbenzotriazole, and the like can be given.

[0083] The composition according to the present embodiment can contain, within a range not impairing the object of the present application, a preservative, an antioxidant, a light stabilizer, a heavy metal deactivator, a silane coupling agent, a plasticizer, an antifoaming agent, a coloring agent such as a pigment and a dye, a rheology modifier, a flame retardant, and the like.

[0084] The composition according to the present embodiment contains the component (A) and the component (B) as essential components, and can be used as a cleaner composition or a coating agent composition.

[0085] The pH of the cleaner composition according to the present embodiment is preferably 8.0 to 10.5, more preferably 8.2 to 10.0, and further preferably 8.5 to 9.5. If the pH of the cleaner composition is within the above range, the rust-preventive property based on the cleaner composition is further exerted, and the temporal stability of the cleaner composition is also improved.

[0086] The pH of the coating agent composition according to the present embodiment is preferably 8.0 to 10.5, more preferably 8.0 to 10.0, further preferably 8.0 to 9.5, and particularly preferably 8.0 to 9.0. If the pH of the coating agent composition is within the above range, the rust-preventive property based on the coating agent composition is further exerted, and the temporal stability of the coating agent composition is also improved.

[0087] In the case of using the composition according to the present application as a cleaner composition, the (A) component and the (B) component are contained. More preferably, the cleaner composition contains only the (A) component and the (B) component. The pH of the cleaner composition is 8.0 to 11.0. Even after use as a cleaner composition, the cleaner composition does not become turbid or produce a precipitate, and can be used for a long time for cleaning a metal member by performing a cleaning treatment such as immersing a metal member such as a bolt in the cleaner composition, immersing it and irradiating it with ultrasonic waves, immersing it and heating it (for example, immersing it at 80°C for 3 minutes to 1 hour), or immersing it and irradiating it with ultrasonic waves while heating it (for example, irradiating it with ultrasonic waves while immersing it at 80°C for 3 minutes to 1 hour). Note that the immersion of the metal member in the cleaner composition described above can be continuous immersion or intermittent (discontinuous) immersion, and the immersion time (the use time of the cleaner composition) is considered as the total of the actual immersion times.

[0088] Thus, based on the present application, there is also provided a method for cleaning a metal member, which includes a cleaning step of immersing a metal member in a cleaner composition according to the present application and irradiating it with ultrasonic waves.

[0089] In addition, based on the present application, there is also provided a method for cleaning a metal member, which includes a cleaning step of immersing a metal member in a cleaner composition according to the present application and irradiating it with ultrasonic waves, and a drying step of drying the metal member after the cleaning step. The drying of the metal member after immersion in the cleaner composition described above can be continuous heating or intermittent (discontinuous) heating.

[0090] The temperature of the cleaner composition in the cleaning step (the cleaning temperature of the metal member) is preferably 40 to 100°C, more preferably 60 to 90°C, and particularly preferably 70 to 85°C. The time for which the metal member is immersed in the cleaner composition (the cleaning time) is preferably 1 minute to 3 hours, more preferably 3 minutes to 2 hours, and further preferably 3 minutes to 1 hour. In addition, in the drying step after the cleaning step, the drying method is not particularly limited and drying by standing in a warm air drying oven or standing in a constant temperature tank or a high temperature and high humidity tank, or the like, is acceptable. The drying temperature in the drying step is preferably 25 to 120°C, more preferably 40 to 120°C, further preferably 50 to 115°C, and particularly preferably 60 to 110°C.

[0091] In the case where the composition according to the present embodiment is used as a coating agent composition, the (A) component, the (B) component, and the (C) component are contained. More preferably, the coating agent composition contains only the (A) component, the (B) component, the (C) component, and a surfactant. The pH of the coating agent composition is 8.0 to 11.0, preferably 8.0 to 10.0. As long as it is used as a coating agent, even if a metal member such as a bolt is immersed therein, the coating agent composition does not discolor and can be used for a long period of time. The following coating treatment is performed, and even after being used as a coating agent composition, the coating agent composition does not discolor and can be used for a long period of time for coating of a metal member: immersion of a metal member such as a bolt in the coating agent composition; immersion and heating (for example, immersion at 40°C for 1 minute to 1 hour); or immersion and heating while irradiating ultrasonic waves (for example, irradiation of ultrasonic waves in a state of immersion at 40°C for 3 minutes to 1 hour); and the like. Note that the immersion of the metal member in the coating agent composition described above can be in a state of continuous immersion or in a state of intermittent (discontinuous) immersion, and as the immersion time (the use time of the coating agent composition) in the coating agent composition, the total of the actual immersion times is considered.

[0092] Thus, based on the present application, there is also provided a method for coating a metal member, including: a coating step of immersing a metal member in a coating agent composition according to the present embodiment, or immersing and irradiating ultrasonic waves, and a drying step of drying the metal member after the aforementioned coating step. The drying of the metal member after immersion in the aforementioned coating agent composition can be continuous heating and drying, or intermittent (discontinuous) heating and drying.

[0093] The temperature of the coating agent composition in the coating step is preferably 20 to 100°C, more preferably 25 to 80°C, and particularly preferably 30 to 60°C. The time for which the metal member is immersed in the coating agent composition is preferably 1 minute to 3 hours, more preferably 3 minutes to 2 hours, and further preferably 3 minutes to 1 hour. In the drying step after the coating step, the drying method can be drying by standing in a warm air drying oven or standing in a constant temperature tank or a high temperature and high humidity tank. The drying temperature in the drying step is preferably 25 to 120°C, more preferably 40 to 120°C, further preferably 50 to 115°C, and particularly preferably 60 to 110°C.

[0094] The cleaner composition according to the present aspect and the coating composition according to the present aspect are used to clean and dry a threaded portion that is all or a part of a threaded member, thereby completing rustproof treatment. More specifically, after cleaning a metal member by immersing it in the cleaner composition one or more times, the metal member is immersed in the coating composition and dried, thereby forming a coating film (coating) on the surface of the metal member, and completing rustproof treatment. Even if rustproof treatment is completed by the cleaner composition, rustproof treatment based on the coating composition can be further performed, thereby imparting more excellent rustproof properties. The coating film (coating) can be formed by the coating composition immediately after cleaning of the metal member by the cleaner composition, or can be formed by the coating composition after a lapse of a certain period of time after cleaning of the metal member by the cleaner composition. For example, the coating film (coating) can be formed by the coating composition after a lapse of 10 minutes, 1 day (24 hours), 3 days (72 hours), 5 days (120 hours), or 7 days (168 hours) after cleaning of the metal member by the cleaner composition.

[0095] Thus, based on the present application, there is also provided a rustproof method for a metal member, including: a cleaning step of immersing a metal member in a cleaner composition according to the present aspect and irradiating ultrasonic waves, a coating step of immersing the metal member in a coating composition according to the present aspect after the cleaning step, or immersing and irradiating ultrasonic waves, and a drying step of drying the metal member after the coating step.

[0096] In the present aspect, the metal member can be a threaded member. As the threaded member, a screw, a bolt, a nipple having a threaded portion, a socket, a tapered plug, a screw joint member such as an elbow, the inner periphery of a nut, and the like can be given, but are not limited thereto. As the material of the threaded member, a metal such as iron, aluminum, gold, stainless steel, SUS, and the like can be given, and can be subjected to plating treatment such as zinc plating, chromate treatment, and the like, and oil or the like can be left on the threaded portion.

[0097] In cleaning by the cleaner composition and / or coating by the coating composition, an ultrasonic cleaner can be used in the case of immersing the metal member (threaded member) in the cleaner composition and / or the coating composition. As the ultrasonic cleaner, one in which an ultrasonic vibrator and a bath are integrated can be used. In addition, the bath can be maintained at a predetermined temperature (for example, 25 to 60°C) by a heater, a chiller, or the like.

[0098] The metal member (screwed member) immersed in the cleaner composition or / and the coating agent composition can be dried by, for example, being left in a warm air drying oven adjusted to an atmosphere of 25 to 120°C. The drying temperature of the metal member (screwed member) is preferably 40 to 120°C, more preferably 50 to 115°C, and further preferably 60 to 110°C. By drying the metal member (screwed member) in the above temperature range, the evaporation speed of the volatile component can be moderately adjusted, the rustproof property can be improved, and rusting of the metal member (screwed member) can be suppressed. In the case of the coating agent composition, the evaporation speed of the volatile component can be appropriately adjusted, a uniform coating film can be formed, and the rustproof property can be further exerted. In addition, according to one embodiment, the drying time of the metal member (screwed member) in the warm air drying oven is preferably 5 minutes to 1 hour, and more preferably 5 minutes to 30 minutes.

[0099] Examples

[0100] The present application will be described in more detail by way of examples, but the present application is not limited to these examples. In addition, the cleaner composition can be simply referred to as a cleaner, the coating agent composition can be simply referred to as a coating agent, and the cleaner composition and the coating agent composition can be collectively referred to as a composition.

[0101] [Examples 1 to 7, Comparative Examples 1 to 13]

[0102] The following ingredients were prepared for the preparation of the composition. Here, the pH of the (A) component or the (A') component can be measured in the same manner as the cleaner pH measurement and the coating agent pH measurement described later.

[0103] (A) component: water having a pH of 9.0 to 12.0

[0104] • Alkaline electrolyzed water having a pH of 11.0 (adjusted using an alkaline electrolyzed water generating device EW3000A manufactured by Amano Corporation)

[0105] • Ion exchange water adjusted to an alkaline aqueous solution 1 having a pH of 10.7 using ammonia water (hereinafter referred to as adjusted water 1)

[0106] • Ion exchange water adjusted to an alkaline aqueous solution 2 having a pH of 9.4 using ammonia water (hereinafter referred to as adjusted water 2)

[0107] (A') component: water other than the (A) component

[0108] • Ion exchange water having a pH of 6.3

[0109] (B) component: sodium benzoate

[0110] • Antirust agent containing sodium benzoate as an antirust component (containing (B) component: 10 mass%) (ASCOTRAN HPB, manufactured by ASCOTEC Corporation)

[0111] • Antirust agent containing sodium benzoate as an antirust component (containing (B) component: 10 mass%) (ASCOTRAN AL-4, manufactured by ASCOTEC Corporation)

[0112] (B') component: Antirust component of sodium benzoate

[0113] • Antirust agent containing 2-mercaptobenzothiazole as an antirust component (containing (B') component: 15 mass%) (ASCONIUM 142 / DA, manufactured by ASCOTEC Corporation)

[0114] • Antirust agent containing 1,2,3-benzotriazole as an antirust component (containing (B') component: 15 mass%) (ASCONIUM 112, manufactured by ASCOTEC Corporation)

[0115] (C) component: Latex particles dispersed in the composition

[0116] • Water-based polymer acrylic latex (solid component equivalent to (C) component: 45 mass%) (Newcoat KSB-1, manufactured by Shin Nakamura Chemical Industrial Co., Ltd.; (meth)acrylic copolymer, non-self-crosslinking type, Tg: 0°C)

[0117] Other components

[0118] • Nonionic surfactant (NOIGEN ET-115, manufactured by DKS Enterprises Co., Ltd.)

[0119] Preparation Examples 1 to 3 and Comparative Examples 1 to 7 were prepared as cleaning agents. The (A) component (or the (A') component), the (B) component (or the (B') component) were weighed into a beaker for stirring, and stirred for 10 minutes. The detailed preparation amounts are shown in Table 1, and all the values are in mass parts. In addition, for Preparation Examples 1 to 3 and Comparative Examples 1 to 7, cleaning agent pH measurement, cleaning agent appearance confirmation, and bolt corrosion confirmation 1 were performed. The results thereof are summarized in Table 1.

[0120] [Cleaning agent pH measurement]

[0121] Measurement was performed at 25°C using a glass electrode type pH meter (LAQUA D-210P, manufactured by HORIBA, Ltd.) as "cleaning agent pH". The pH measurement method was based on JIS Z 8802 (2011).

[0122] [Cleaning agent appearance confirmation]

[0123] In a 50 mL glass bottle with a lid, 40 parts by mass of the composition 40 and 4 bolts (material: iron blank, product name: Hexagonal bolt M10 x 20 iron full thread (Kingodai Screw Co., Ltd.), length: L size 20 mm, diameter: 10 mm) were placed and the lid was closed. It was confirmed that the bolts were fully immersed in the composition. The entire composition was transparent at the initial stage. The glass bottle was placed in a warm air drying oven set to an atmosphere of 80°C for 1 week. If the glass bottle was removed from the warm air drying oven and returned to 25°C, visual confirmation was performed according to the following evaluation criteria as "cleaner appearance". From the viewpoint that the cleaner is not deteriorated and can be used continuously, "O" is preferred.

[0124] Evaluation Criteria

[0125] O: The composition maintained the initial transparency;

[0126] Δ: The composition maintained the initial transparency but precipitates were generated;

[0127] X: The composition became turbid and precipitates were generated.

[0128] [Bolt Corrosion Confirmation 1]

[0129] The bolts used in the above test were removed and dried in a warm air drying oven set to an atmosphere of 105°C for 8 minutes. Thereafter, it was placed in an environment of 85°C x 85% RH for 1 day. Thereafter, the appearance was visually confirmed according to the following evaluation criteria as "corrosion confirmation 1". However, in the above test, "Δ" or "X" was not confirmed and was recorded as "-".

[0130] Evaluation Criteria

[0131] O: The bolt surface was not rusted;

[0132] X: The bolt surface was rusted all over.

[0133]

[0134] The appearance of the cleaner was maintained in the initial state of transparency in Examples 1 to 3 using the (A) component having a pH of 9.0 to 12.0, as compared with Comparative Examples 1 and 2 using the (A') component having a pH of less than 9.0. In addition, Comparative Examples 3 and 5 did not contain the (B) component, and Comparative Examples 6 and 7 contained a rust preventive other than the (B) component, but it was found that the appearance of the cleaner was turbid or precipitates were generated. In addition, in Examples 1 to 3, it was confirmed that the appearance of the cleaner was "O" and the bolt corrosion confirmation 1 was also "O", and the cleaner could be used for a long period of time, and the rust-preventing effect on the threaded member was also exhibited. The result of Comparative Example 4 was that although the appearance of the cleaner was also "O", the bolt corrosion confirmation 1 was "X". Note that in the present example, even when ultrasonic treatment (for example, 80°C x 4 minutes / 1 time, 40 Hz, etc.) was performed while the bolt was immersed in the cleaner, it was confirmed that the result of the cleaner based on Examples 1 to 3 was that the appearance of the cleaner and the bolt corrosion test 1 were both good results (both "O").

[0135] Examples 4 to 7 and Comparative Examples 8 to 13 were prepared as coating agents. The (A) component (or the (A') component), the (B) component (or the (B') component), the (C) component, and other components were weighed and put into a beaker for stirring, and stirred for 30 minutes. The details of the preparation amounts are shown in Table 2, and all the values are shown as parts by mass. In addition, for Examples 4 to 7 and Comparative Examples 8 to 13, the coating agent pH measurement, the coating agent appearance confirmation, and the bolt corrosion confirmation 2 were performed. The results are also summarized in Table 2.

[0136] [Coating agent pH measurement]

[0137] The measurement was performed at 25°C using a glass electrode type pH meter (LAQUA D-210P manufactured by HORIBA, Ltd.) as the "coating agent pH". The pH measurement method was based on JIS Z 8802 (2011).

[0138] [Coating agent appearance confirmation]

[0139] A bolt cleaned with dichloromethane (material: iron base, product name: hexagonal bolt M10 x 20 iron full thread (Kongo Tekko Co., Ltd.), length: L size 20 mm, diameter: 10 mm) was used. The composition 40 parts by mass and 4 cleaned bolts described above were put in a 50 mL glass bottle with a cap, and the cap was put on. It was confirmed that the bolts were entirely immersed in the composition. The entire composition was white at the initial stage. The glass bottle was left in a warm air drying oven set to an atmosphere of 80°C for 1 week. The glass bottle was taken out of the warm air drying oven, and returned to 25°C, and visual confirmation was performed according to the following evaluation criteria as the "coating agent appearance". From the viewpoint that the coating agent should not be deteriorated and should be able to be used continuously, "O" is preferable.

[0140] Evaluation criteria

[0141] O: The composition maintains the initial white color;

[0142] X: The composition becomes discolored to brown.

[0143] [Confirmation of Bolt Corrosion 2]

[0144] The bolts used in the above test were taken out and dried in a warm air drying oven set to an atmosphere of 105°C for 8 minutes. Thereafter, they were left in an environment of 85°C x 85% RH for 2 days. Thereafter, visual appearance confirmation was performed in accordance with the following evaluation criteria as "Corrosion Confirmation 2".

[0145] Evaluation Criteria

[0146] O: The bolt surface is not rusted;

[0147] Δ: The bolt surface is partially rusted;

[0148] X: The bolt surface is entirely rusted.

[0149]

[0150] Examples 4 to 7 using (A) component having a pH of 9.0 to 12.0, compared with Comparative Example 11 using (A') component having a pH lower than 9.0, the appearance of the coating agent maintained the initial white color and was "O" in the bolt corrosion confirmation 2. In addition, Comparative Examples 8, 9, and 10 did not contain (B) component, and Comparative Example 10, although the appearance of the coating agent was "O", was rusted in the bolt corrosion confirmation 2. Comparative Examples 12 and 13 contained rust preventives other than (B) component, but both were discolored in the appearance of the coating agent and were "Δ" in the bolt corrosion confirmation 2. In Examples 4 to 7, it was confirmed that the appearance of the coating agent was "O" and the bolt corrosion confirmation 2 was also "O", and the coating agent could be used for a long time, and the rust prevention effect of the threaded fastening member was also fully exhibited under an atmosphere of 105°C for 2 days. Note that, in the present example, in the case where the bolt was subjected to ultrasonic treatment (for example, 40°C x 4 minutes / 1 time, 40 Hz, etc.) while being immersed in the coating agent, it was confirmed that the appearance of the coating agent and the bolt corrosion test 2 were both good results (both "O") based on the results of the coating agent of Examples 4 to 7.

[0151] In addition, in the present example, in the case where the bolt cleaned by the cleaner of Examples 1 to 3 was coated with the coating agent of Examples 4 to 7, it was confirmed that the appearance of the coating agent and the bolt corrosion test 2 were both good results (both "O").

[0152] This application is based on Japanese Patent Application No. 2023-113473 filed on July 11, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0153] Industrial applicability

[0154] In the case of using a general cleaner, if heating drying is performed after cleaning, rusting occurs in a shorter time than 1 day, but by using the cleaner composition according to the present application, even if heating drying is performed, the threaded fitting member as a metal member can be prevented from rusting. Furthermore, by using the coating agent composition according to the present application, a long-term rust prevention effect is further exhibited. The present application can be used for threaded fitting members as a base material treatment before a so-called pre-coating agent exhibiting reactivity at the time of threaded fitting is treated.

Claims

1. A cleaning agent composition, wherein, (A) component and a (B) component described below and has a pH of 8.0 to 11.0, (A) component: an aqueous alkaline solution, (B) component: sodium benzoate.

2. The cleaner composition according to claim 1, wherein the (A) component has a pH of 9.0 to 12.

0.

3. A composition for application, wherein, (A) to (C) components described below and has a pH of 8.0 to 11.0, (A) component: an aqueous alkaline solution, (B) component: sodium benzoate, (C) component: a latex particle.

4. The coating agent composition according to claim 3, wherein the (A) component has a pH of 9.0 to 12.

0.

5. The coating agent composition according to claim 3, wherein further comprising a surfactant.

6. The coating agent composition according to claim 5, wherein the surfactant is a nonionic surfactant.

7. The coating agent composition according to claim 6, wherein the nonionic surfactant is a polyoxyethylene-based nonionic surfactant.

8. The coating agent composition according to claim 3, wherein the (C) component is a latex particle containing a (meth)acrylic acid polymer.

9. A method of cleaning a metal part, wherein, comprising: a cleaning process of immersing a metal member in the cleaner composition described in claim 1 and irradiating ultrasonic waves.

10. A method of coating a metal part, wherein, comprising: a coating process of immersing a metal member in the coating agent composition described in claim 3 and irradiating ultrasonic waves, and a drying process of drying the metal member after the coating process.

11. A rust-preventive method for a metal member, wherein, comprising: a cleaning process of immersing a metal member in the cleaner composition described in claim 1 and irradiating ultrasonic waves, a coating process of immersing the metal member in the coating agent composition described in claim 3 and irradiating ultrasonic waves after the cleaning process, and a drying process of drying the metal member after the coating process.

12. The metal member cleaning method according to claim 9, wherein the metal member is a threaded fitting member.

13. The metal member coating method according to claim 10, wherein the metal member is a threaded fitting member.

14. The metal member rust prevention method according to claim 11, wherein the metal member is a threaded fitting member.

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