Components of the detergent and components of the coating.

Abstract

DEPCT69 This invention provides for the inclusion of a cleaning agent or a coating component. Having excellent rust-preventive properties, this invention involves the components of a cleaning agent which... It consists of component (A): an alkaline aqueous solution; and component (B): sodium. Benzoate, in which the pH of the detergent component is 8.0 to 11.0, and the composition of... Coating consisting of the following components (A): alkaline aqueous solution; component (B): sodium benzoate; and component (C): emulsion particles, in which the pH of the components The coating grade is 8.0 to 11;

Description

Cleaning composition and coating composition

[0001] The present invention relates to an aqueous cleaning composition and an aqueous coating composition.

[0002] Sodium benzoate is known as a rust inhibitor. Patent Document 1 describes that by adjusting the pH of a sodium benzoate aqueous solution to an acidic value and then kneading it into a substrate, it can be used in a volatile rust-preventive film, thereby preventing rust on metal parts and the like. However, for processed metal parts, the risk of rusting on the metal parts themselves cannot be reduced unless contaminants such as oil and dust are removed, so cleaning of metal parts is important from the perspective of rust prevention. Furthermore, metal parts are subjected to a rust prevention treatment using a coating agent after cleaning.

[0003] JP 2015-78410 A

[0004] However, conventional cleaning agents or coating agents used for cleaning or coating metal parts tend to gradually deteriorate with long-term use, making it difficult to use the same agent (cleaning agent or coating agent) for a long period of time. Furthermore, when cleaning or coating treatment was performed using conventional cleaning agents or coating agents, rust occurred within a short period of time (e.g., one day after treatment), and the rust-preventing performance was insufficient. Therefore, a cleaning agent or coating agent with sufficient rust-preventing effect has been desired.

[0005] As a result of extensive research to achieve the above object, the present inventors discovered techniques relating to aqueous cleaning compositions and aqueous coating compositions, and completed the present invention.

[0006] The gist of the present invention will now be described. A first embodiment of the present invention is a cleaning composition comprising the following components (A) and (B), and having a pH of 8.0 to 11.0: Component (A): alkaline aqueous solution Component (B): sodium benzoate A second embodiment of the present invention is the cleaning composition according to the first embodiment, wherein the pH of component (A) is 9.0 to 12.0.

[0007] A third embodiment of the present invention is a coating composition comprising the following components (A) to (C), and having a pH of 8.0 to 11.0: Component (A): alkaline aqueous solution Component (B): sodium benzoate Component (C): emulsion particles A fourth embodiment of the present invention is the coating composition according to the third embodiment, wherein the pH of component (A) is 9.0 to 12.0.

[0008] A fifth embodiment of the present invention is the coating composition according to the third or fourth embodiment, further comprising a surfactant.

[0009] A sixth embodiment of the present invention is the coating composition according to the fifth embodiment, wherein the surfactant is a nonionic surfactant.

[0010] A seventh embodiment of the present invention is the coating agent composition according to the sixth embodiment, wherein the nonionic surfactant is a polyoxyethylene-based nonionic surfactant.

[0011] An eighth embodiment of the present invention is the coating agent composition according to any one of the third to seventh embodiments, wherein the component (C) is emulsion particles made of a (meth)acrylic polymer.

[0012] A ninth embodiment of the present invention is a method for cleaning a metal part, comprising a cleaning step of immersing a metal part in the cleaning agent composition according to the first or second embodiment and irradiating the metal part with ultrasonic waves.

[0013] A tenth embodiment of the present invention is a method for coating a metal part, comprising: a coating step of immersing a metal part in the coating agent composition according to any one of the third to eighth embodiments, or immersing the metal part in the coating agent composition and irradiating the metal part with ultrasonic waves; and a drying step of drying the metal part after the coating step.

[0014] An eleventh embodiment of the present invention is a rust prevention method for a metal part, comprising: a cleaning step of immersing a metal part in the cleaner composition described in the first or second embodiment, or immersing the metal part in the cleaner composition and irradiating the metal part with ultrasonic waves; a coating step of immersing the metal part in the coating agent composition described in any of the third to eighth embodiments and irradiating the metal part with ultrasonic waves after the cleaning step; and a drying step of drying the metal part after the coating step.

[0015] A twelfth embodiment of the present invention is a method for cleaning a metal part, wherein the metal part according to the ninth embodiment is a threaded member.

[0016] A thirteenth embodiment of the present invention is a method for coating a metal part, wherein the metal part according to the tenth embodiment is a threaded member.

[0017] A fourteenth embodiment of the present invention is a method for preventing rust of a metal part, wherein the metal part according to the eleventh embodiment is a threaded member.

[0018] According to the present invention, there is provided a cleaning composition or a coating composition which can be used for a long period of time and has excellent rust prevention properties.

[0019] Modes for carrying out the present invention are described in detail below. The embodiments described herein are illustrative examples for embodying the technical concept of the present invention and are not intended to limit the present invention. Therefore, all other possible embodiments, methods of use, and operational techniques conceivable by those skilled in the art without departing from the spirit of the present invention are included within the scope and spirit of the present invention, as well as within the scope of the claims and their equivalents. The embodiments described herein can be arbitrarily combined to produce other embodiments. Furthermore, in this specification, the range "X to Y" means "X or more and Y or less," and "weight" and "mass," "wt%" and "mass%," and "parts by weight" and "parts by mass" are treated as synonyms. In this specification, "A and / or B" encompasses both A and B, as well as both A and B. In this specification, the term "(meth)acrylic" encompasses both acrylic and methacrylic. Thus, for example, the term "(meth)acrylic acid" encompasses 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. Unless otherwise specified, in this specification, operations and measurements of physical properties are performed at room temperature (20° C. or higher and 25° C. or lower) and at a relative humidity of 40% RH or higher and 50% RH or lower.

[0020] <Cleaning Composition> One aspect of the present invention is a cleaning composition containing the following components (A) and (B): component (A): alkaline aqueous solution; component (B): sodium benzoate, and having a pH of 8.0 to 11.0. The cleaning composition having such a configuration can suppress rust formation on metal parts after cleaning. For example, rust formation on metal parts can be suppressed even when heated and dried after cleaning with the cleaning composition. Furthermore, the cleaning composition of this aspect is highly stable and can be stored and used for long periods of time. Therefore, the coating composition of one aspect of the present invention suppresses deterioration of the cleaning composition when cleaning machined metal parts such as bolts, making it possible to continue using the same solution for long periods of time.

[0021] <Coating Composition> Another aspect of the present invention is a coating composition comprising the following components (A) to (C): (A) component: alkaline aqueous solution; (B) component: sodium benzoate; and (C) component: emulsion particles, and having a pH of 8.0 to 11.0. A coating composition having such a configuration can suppress rust formation on coated metal parts. For example, rust formation on metal parts can be suppressed when heat drying is performed after coating. Furthermore, the coating composition of this aspect is highly stable and can be stored and used for long periods of time. Therefore, the coating composition of one aspect of the present invention suppresses deterioration of the coating composition when coating processed metal parts such as bolts, making it possible to continue using the same liquid for long periods of time. Furthermore, the coating composition of one aspect of the present invention prevents rust from forming on metal parts even when heat drying is performed.

[0022] Generally, when metal parts are cleaned with an aqueous detergent, rust may develop on the metal parts after drying. As described above, the cleaning composition and coating composition according to one embodiment of the present invention, despite being aqueous compositions, remove oily stains (such as cutting oil) and do not develop rust even when dried after cleaning. In addition, the coating composition according to another embodiment of the present invention forms a uniform coating film on the surface of the substrate and does not develop rust even when left for a long period of time after coating. Furthermore, conventional cleaning agents and coating agents have low liquid stability and gradually deteriorate with prolonged use, making them difficult to use for long periods of time. The cleaning composition and coating composition according to one embodiment of the present invention have high liquid stability and do not change in state even when used for a long period of time, allowing for long-term use.

[0023] The cleaning composition of one embodiment of the present invention and the coating composition of another embodiment of the present invention share the components (A) and (B). Hereinafter, the components (A) and (B) and other components (additives, etc.) will be applied to the cleaning composition and the coating composition unless otherwise specified. Therefore, hereinafter, the term "composition according to this embodiment" encompasses both the cleaning composition and the coating composition. When describing either the cleaning composition or the coating composition, it will be referred to as "cleaning composition according to this embodiment" or "coating composition according to this embodiment."

[0024] The composition according to the present embodiment includes an alkaline aqueous solution as the component (A). Here, the alkaline aqueous solution as the component (A) may be a composition containing a basic compound and water. The component (A) (alkaline aqueous solution) that can be used in the composition according to the present embodiment may be an aqueous solution in which a basic compound is mixed with water such as ion-exchanged water, distilled water, or tap water, or may be alkaline electrolyzed water.

[0025] The alkaline aqueous solution has a pH greater than 7.0, preferably a pH of 7.5 to 12.0, more preferably a pH of 8.0 to 12.0, and even more preferably a pH of 9.0 to 12.0. Thus, according to one embodiment, component (A) (alkaline aqueous solution) is an alkaline aqueous solution having a pH of 9.0 to 12.0. Also, according to one embodiment, component (A) (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. According to one embodiment, component (A) (alkaline aqueous solution) is alkaline electrolyzed water. Therefore, component (A) (alkaline aqueous solution) is preferably alkaline electrolyzed water with a pH of more than 7.0, more preferably alkaline electrolyzed water with a pH of 7.5 to 12.0, even more preferably alkaline electrolyzed water with a pH of 8.0 to 12.0, and particularly preferably alkaline electrolyzed water with a pH of 9.0 to 12.0. According to one embodiment, component (A) (alkaline aqueous solution) is alkaline electrolyzed water with a pH of 9.5 to 11.5, alkaline electrolyzed water with a pH of 10.0 to 11.5, or alkaline electrolyzed water with a pH of 10.5 to 11.5.

[0026] Component (A) can be used as a cleaning composition or a coating composition by being used in combination with component (B), which will be described later. When component (A) is an alkaline aqueous solution having a pH of greater than 7.0 or from 7.5 to 12.0 (preferably from 8.0 to 12.0, more preferably from 9.0 to 12.0, even more preferably from 9.5 to 11.5, particularly preferably from 10.0 to 11.5, and most preferably from 10.5 to 11.5), or alkaline electrolyzed water having a pH of greater than 7.0 or from 7.5 to 12.0 (preferably from 8.0 to 12.0, more preferably from 9.0 to 12.0, even more preferably from 9.5 to 11.5, particularly preferably from 10.0 to 11.5, and most preferably from 10.5 to 11.5), deterioration of the cleaning composition or coating composition is suppressed, allowing for long-term use and enhancing rust prevention properties.

[0027] Although the details of the mechanism by which the above-described structure of component (A) provides the above-described effects are unclear, it is believed that the environment in which component (A) best exhibits the rust-preventing properties of component (B) in the composition of this embodiment is component (A). Furthermore, it is believed that the composition effectively peels off dirt from metal parts, allowing the dirt to remain stable in the liquid, suppressing the formation of aggregates and enabling longer-term use.

[0028] The component (A) (alkaline aqueous solution) may contain, for example, a basic compound, so that its pH exceeds 7.0 or is 7.5 to 12.0 (preferably 8.0 to 12.0, more preferably 9.0 to 12.0, even more preferably 9.5 to 11.5, particularly preferably 10.0 to 11.5, and most preferably 10.5 to 11.5). Examples of the basic compound include nitrogen-containing organic or inorganic basic compounds, alkali metal or alkaline earth metal hydroxides, and various carbonates and bicarbonates. Examples include alkali metal hydroxides, quaternary ammonium hydroxides or salts thereof, ammonia, and amines. Specific examples of alkali metal hydroxides include potassium hydroxide and sodium hydroxide. Specific examples of carbonates or bicarbonates include ammonium bicarbonate, ammonium carbonate, potassium bicarbonate, potassium carbonate, sodium bicarbonate, and sodium carbonate. Specific examples of the quaternary ammonium hydroxide or its salt include tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrabutylammonium hydroxide, etc. Specific examples of the amine include methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, ethylenediamine, monoethanolamine, N-(β-aminoethyl)ethanolamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, etc.

[0029] From the viewpoint of rust prevention and the like, preferred basic compounds include ammonia, potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, ammonium hydrogen carbonate, ammonium carbonate, potassium hydrogen carbonate, potassium carbonate, sodium hydrogen carbonate, and sodium carbonate. Among these, preferred examples include ammonia, potassium hydroxide, sodium hydroxide, tetramethylammonium hydroxide, and tetraethylammonium hydroxide. Such basic compounds can be used alone or in combination of two or more.

[0030] The component (A) can be prepared as an alkaline aqueous solution having a pH of 9.0 to 12.0 by, for example, adjusting the pH of ion-exchanged water with ammonia water.

[0031] The component (A) may be alkaline electrolyzed water. There are no particular limitations on the alkaline electrolyzed water, and alkaline electrolyzed water produced in a one-tank, two-tank, or three-tank electrolytic cell may be used. The alkaline electrolyzed water is produced by electrolyzing water or an electrolyte aqueous solution obtained by dissolving an electrolyte in water, and alkaline electrolyzed water produced in a known electrolyzed water production device may be used as appropriate. Examples of the electrolyzed water production device that can be used include the alkaline electrolyzed water production device EW3000A manufactured by Amano Corporation and the strong alkaline electrolyzed water production system (ZK series) manufactured by Zao Sangyo Co., Ltd.

[0032] The electrolyte used for alkaline electrolyzed water can be appropriately selected from known electrolytes. When a single-tank electrolytic cell is used, alkaline electrolytes (pH 8.5 to pH 14) such as sodium bicarbonate, potassium bicarbonate, sodium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, and sodium metasilicate are preferably used. When alkaline electrolyzed water is produced in a two-tank or three-tank electrolytic cell, in addition to similar alkaline electrolytes, neutral electrolytes (pH 5.5 to pH 8.5) such as table salt are preferably used.

[0033] When component (A) is alkaline electrolyzed water, specifically, water or an electrolyte aqueous solution containing water and an electrolyte is electrolyzed using an alkaline electrolyzed water production device to produce water (alkaline electrolyzed water) with a pH of over 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, even more preferably a pH of 9.5 to 11.5, particularly preferably a pH of 10.0 to 11.5, and most preferably a pH of 10.5 to 11.5).

[0034] According to one embodiment, the pH of component (A) is 9.3 to 12.0, 9.5 to 12.0, or 10.0 to 12.0.

[0035] As described above, when component (A) is an alkaline aqueous 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, even more preferably a pH of 9.5 to 11.5, particularly preferably a pH of 10.0 to 11.5, and most preferably a pH of 10.5 to 11.5), the pH may be in the above range by, for example, containing a basic compound, or the alkaline electrolyzed water may have a pH in the above range obtained by alkaline electrolysis of water or an electrolytic aqueous solution containing water and an electrolyte.

[0036] As described above, in the composition according to the present embodiment, the component (A) is preferably an alkaline aqueous solution having a pH of 9.0 to 12.0, and more preferably alkaline electrolyzed water prepared by electrolyzing water or an electrolytic aqueous solution containing water and an electrolyte.

[0037] Component (B) The composition according to this embodiment contains sodium benzoate as component (B). Sodium benzoate is used as a rust-preventing component. Specific examples of component (B) include sodium benzoate itself as a reagent, or a composition (rust inhibitor) containing sodium benzoate. Examples of rust inhibitors containing sodium benzoate include, but are not limited to, ASCOTRAN (registered trademark, hereinafter omitted) HPB and ASCOTRAN AL-4 manufactured by ASCOTEC (sold by GSI Creos Corporation).

[0038] The content of component (B) in the composition according to this embodiment is preferably 0.01 to 10.0 parts by mass, more preferably 0.03 to 8.0 parts by mass, even more 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 component (A). According to one embodiment, the content of component (B) in the composition according to this embodiment may 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 component (A).

[0039] Component (C) The coating agent composition according to this embodiment contains emulsion particles (resin emulsion) as component (C). The emulsion particles as component (C) are dispersed in the composition. Component (C) is preferably resin particles uniformly dispersed in water, and more preferably emulsion particles ((meth)acrylic resin emulsion) made of a (meth)acrylic polymer or a (meth)acrylic copolymer. When the cleaning agent composition according to this embodiment contains component (C), it becomes the coating agent composition according to this embodiment.

[0040] The component (C) may be present in a form dispersed in a medium such as water, and when the medium such as water dries, the emulsion particles (resin emulsion) fuse to form a film. By containing the component (C) in the coating composition according to this embodiment, the coating (paint film) formed by the coating composition has good adhesion to metal parts. As a result, the coating composition according to this embodiment can exhibit excellent rust prevention properties.

[0041] The component (C) used in the coating composition of this embodiment can be, for example, a commercially available (meth)acrylic resin emulsion (polymer acrylic emulsion), and can include a resin emulsion containing at least a (meth)acrylic acid derivative. Examples of (meth)acrylic resin emulsions include (meth)acrylic acid polymer emulsions; (meth)acrylic acid copolymer emulsions such as ethylene / vinyl acetate / (meth)acrylic acid derivative copolymer emulsions, ethylene / (meth)acrylic acid derivative copolymer emulsions, poly(meth)acrylic acid derivative emulsions, styrene / (meth)acrylic acid derivative copolymer emulsions, and vinyl acetate / (meth)acrylic acid derivative emulsions. The (meth)acrylic acid derivative refers to acid derivatives such as acrylic acid and / or methacrylic acid, and esters thereof, and contains at least one of these components. The emulsion particles (resin emulsion) can be either self-crosslinking or non-self-crosslinking, but non-self-crosslinking is preferred.

[0042] Specific examples of the (meth)acrylic acid derivative include 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, etc. Among these, component (C) is preferably a (meth)acrylic copolymer or a (meth)acrylic resin emulsion composed of a polymer containing a (meth)acrylic acid ester as a constituent monomer.

[0043] Specific examples of component (C) include the New Coat series (New Coat KSB-1, New Coat SFK-1000A, New Coat SFK-8000A) manufactured by Shin-Nakamura Chemical Co., Ltd.; Jurymer AC-10S (mass average molecular weight of about 5000) and Jurymer AS-10SH (mass average molecular weight of about 1 million) manufactured by Toagosei Co., Ltd.; Acryset ARL-468 (mass average molecular weight of about 4000) and Acryset ARL-460 manufactured by Nippon Shokubai Co., Ltd.; Polysol AP-1761, Polysol AP-5595N, and Polysol AP-4690N manufactured by Resonac Corporation; and Mowinyl 727, Mowinyl 7525, and Mowinyl 745 manufactured by Japan Coating Resins Co., Ltd., but are not limited to these.

[0044] The glass transition temperature (Tg) of the emulsion polymer (cured product) of the emulsion particles (resin emulsion) is preferably −20° C. or higher and 50° C. or lower, more preferably −15° C. or higher and 40° C. or lower, even more 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. This allows the coating (paint film) formed from the coating agent composition according to this embodiment to have excellent rust prevention properties.

[0045] The glass transition temperature Tg of an emulsion polymer of emulsion particles (resin emulsion) refers to the value obtained by converting the glass transition temperature Tga (K) at absolute temperature calculated by the following (Equation 1) into Celsius temperature. Specifically, when the monomers constituting the emulsion polymer are designated M1, M2, M3, ... Mn, the glass transition temperatures (K) of the homopolymers obtained from each monomer are designated Tg1, Tg2, Tg3, ... Tgn, and the weight proportions (weight fractions) of the constituent units derived from each monomer in the emulsion polymer are designated W1, W2, W3, ... Wn, the glass transition temperature Tg of the emulsion polymer can be calculated from the following (Equation 1) (FOX formula), where W1 + W2 + W3 + ... + Wn = 1. Details thereof are described in Bulletin of the American Physical Society, Series 2, Vol. 1, No. 3, p. 123 (1956). As the glass transition temperatures ((Tg1) to (Tgn)) of homopolymers of various monomers for calculation by the FOX equation, for example, values ​​described in Paints and Coatings (Paint Publishing Company, 10 (No. 358), 1982) can be used.

[0046]

[0047] Here, each Wi / Tgi (where each i is a natural number from 1 to n) constituting the right side of the above formula 1 corresponds to each monomer Mi constituting the emulsion polymer. Therefore, on the right side of the above formula 1, there are the same number of Wi / Tgi as the number of types of monomers constituting the emulsion polymer (n when each i is 1 to n). Therefore, for example, when the (meth)acrylic-styrene copolymer is a binary copolymer composed of monomers M1 and M2, the above formula 1 becomes 1 / Tga = W1 / Tg1 + W2 / Tg2. Furthermore, for example, when the (meth)acrylic-styrene copolymer is a terpolymer composed of monomers M1, M2, and M3, the above formula 1 becomes 1 / Tga = W1 / Tg1 + W2 / Tg2 + W3 / Tg3.

[0048] The component (C) essentially contains emulsion particles (preferably a (meth)acrylic resin emulsion) and water, but may further contain a crosslinking agent and other components.

[0049] The emulsion particles (resin emulsion) can be obtained by a known production method, and can be produced, for example, by a method in which polymerizable monomers, which are raw materials for the resin, are emulsion-polymerized in water or an aqueous solvent using a polymerization initiator in the presence of an emulsifier.

[0050] As the emulsifier, known emulsifiers can be used, including anionic, nonionic, cationic or amphoteric surfactants, and protective colloids such as polyvinyl alcohol.

[0051] The content of component (C) in the coating composition according to this embodiment is preferably 0.1 to 20.0 mass%, more preferably 0.5 to 15.0 mass%, even more preferably 0.8 to 13.0 mass%, even more preferably 1.0 to 12.0 mass%, and most preferably 2.0 to 8.0 mass%, relative to the total mass (100 mass%) of the coating composition. According to one embodiment, the content of component (C) may be 1.0 to 10.0 mass%, 1.0 to 5.0 mass%, or 1.5 to 8.0 mass%, relative to the total mass (100 mass%) of the coating composition. When the content of component (C) is within the above range, the coating film formed by the coating composition is thin and uniform, so that it is not visible to the naked eye, thereby improving rust prevention properties.

[0052] Other Components The composition according to this embodiment may further contain a surfactant. The surfactant may be a surfactant having a —SO ３ Na, -SO ３ NH ４ Examples of such surfactants include anionic surfactants containing anionic groups such as those listed above, nonionic surfactants which are nonionic organic compounds, cationic surfactants made of quaternary ammonium salts, and amphoteric surfactants which contain anionic and cationic groups in the molecule. These surfactants can be used singly or in combination of two or more.

[0053] Examples of anionic surfactants include polyoxyethylene alkyl ether acetates, polyoxyethylene alkyl sulfates, alkyl sulfates, polyoxyethylene alkyl ether sulfates, alkyl ether sulfates, alkyl benzene sulfonates, alkyl phosphates, polyoxyethylene alkyl phosphates, polyoxyethylene sulfosuccinates, alkyl sulfosuccinates, alkyl naphthalene sulfonates, alkyl diphenyl ether disulfonates, and salts thereof.

[0054] Examples of cationic surfactants include alkyltrimethylammonium salts, alkyldimethylammonium salts, alkylbenzyldimethylammonium salts, and alkylamine salts.

[0055] Examples of amphoteric surfactants include alkyl betaines and alkyl amine oxides.

[0056] Examples of nonionic surfactants include polyoxyalkylene alkyl ethers such as polyoxyethylene alkyl ethers, sorbitan fatty acid esters, glycerin fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene alkylamines, and alkylalkanolamides.

[0057] In the coating agent composition according to this embodiment, in consideration of compatibility with component (C), a nonionic surfactant is preferred, a polyoxyethylene-based nonionic surfactant is more preferred, and a polyoxyethylene alkyl ether is particularly preferred. The HLB (Hydrophilic-Lipophilic Balance) value of the nonionic surfactant is preferably 8 to 16, more preferably 9 to 15, and even more preferably 10 to 14. Specific examples of polyoxyethylene-based nonionic surfactants (polyoxyethylene alkyl ethers) include the Noigen series (Noigen ET-65, Noigen ET-95, Noigen ET-115, Noigen ET-135, Noigen ET-165, etc.) manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., but are not limited thereto.

[0058] The content of the surfactant in the coating composition according to this embodiment is preferably 0.01 to 5.0% by mass, and more preferably 0.1 to 3.0% by mass, relative to the total mass (100% by mass) of the coating 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, stickiness of the coating film surface is further suppressed.

[0059] The composition according to this embodiment may contain an azole compound. The azole compound includes a five-membered heterocyclic compound containing one or more nitrogen atoms and a derivative thereof. When the composition according to this embodiment contains an azole compound, the rust prevention properties are improved. Examples of the azole compound include benzotriazole-based compounds, tolyltriazole-based compounds, thiadiazole-based compounds, and imidazole-based compounds. Exemplary azole compounds include triazole, benzotriazole, 4-methylbenzotriazole, and 5-methylbenzotriazole.

[0060] The composition according to this embodiment may contain a storage stabilizer, an antioxidant, a light stabilizer, a heavy metal deactivator, a silane coupling agent, a plasticizer, an antifoaming agent, a colorant such as a pigment or a dye, a rheology adjuster, a flame retardant, or the like, as long as the object of the present invention is not impaired.

[0061] The composition according to this embodiment, which contains the components (A) and (B) as essential components, can be used as a cleaning composition or a coating composition.

[0062] The pH of the cleaning composition according to this embodiment is preferably 8.0 to 10.5, more preferably 8.2 to 10.0, and even more preferably 8.5 to 9.5. When the pH of the cleaning composition is within the above range, the cleaning composition exhibits more effective rust prevention and improves the stability over time of the cleaning composition.

[0063] The coating composition according to this embodiment has a pH of preferably 8.0 to 10.5, more preferably 8.0 to 10.0, even more preferably 8.0 to 9.5, and particularly preferably 8.0 to 9.0. When the pH of the coating composition is within the above range, the rust prevention properties of the coating composition are further enhanced, and the stability of the coating composition over time is also improved.

[0064] When the composition according to this embodiment is used as a cleaning composition, it contains component (A) and component (B). A cleaning composition containing only component (A) and component (B) is more preferred. The pH of the cleaning composition is 8.0 to 11.0. Metal parts such as bolts can be immersed in the cleaning composition; immersed and irradiated with ultrasonic waves; immersed and heated (e.g., immersed at 80°C for 3 minutes to 1 hour); or immersed and heated while irradiated with ultrasonic waves (e.g., immersed and irradiated with ultrasonic waves for 3 minutes to 1 hour) and used as a cleaning composition. Even after use as a cleaning composition, the cleaning composition does not become cloudy or produce precipitates, and can be used for cleaning metal parts for a long period of time. The immersion of metal parts in the cleaning composition may be continuous or intermittent (discontinuous), and the immersion time in the cleaning composition (the usage period of the cleaning composition) can be considered as the total time actually immersed.

[0065] Therefore, the present invention also provides a method for cleaning metal parts, which includes a cleaning step of immersing the metal parts in the cleaning composition according to this embodiment and irradiating them with ultrasonic waves.

[0066] The present invention also provides a method for cleaning metal parts, including a cleaning step of immersing a metal part in the cleaning composition according to this embodiment and irradiating the metal part with ultrasonic waves, and a drying step of drying the metal part after the cleaning step. The drying of the metal part after immersion in the cleaning composition may be performed by continuous heating or by intermittent (discontinuous) heating.

[0067] The temperature of the detergent composition in the cleaning step (the cleaning temperature for metal parts) is preferably 40 to 100°C, more preferably 60 to 90°C, and particularly preferably 70 to 85°C. The time for immersing the metal parts in the detergent composition (cleaning time) is preferably 1 minute to 3 hours, more preferably 3 minutes to 2 hours, and even more preferably 3 minutes to 1 hour. In the drying step after the cleaning step, the metal parts may be dried by placing the parts in a hot air drying oven, a constant temperature bath, or a high-temperature, high-humidity bath, for example. The drying temperature in the drying step is preferably 25 to 120°C, more preferably 40 to 120°C, even more preferably 50 to 115°C, and particularly preferably 60 to 110°C.

[0068] When the composition according to this embodiment is used as a coating composition, it contains components (A), (B), and (C). A coating composition containing only components (A), (B), and (C) and a surfactant is more preferred. The pH of the coating composition is 8.0 to 11.0, preferably 8.0 to 10.0. When used as a coating composition, the coating composition does not discolor even when metal parts such as bolts are immersed in the coating composition, allowing for long-term use. The coating composition can be used to coat metal parts for long periods of time without discoloration, even after being used as a coating composition by performing a coating treatment such as immersing a metal part such as a bolt in the coating composition; immersing and heating the part (e.g., immersing for 1 minute to 1 hour at 40°C); or immersing and heating the part while irradiating it with ultrasound (e.g., irradiating with ultrasound while immersed for 3 minutes to 1 hour at 40°C). The immersion of the metal part in the coating composition may be continuous or intermittent (discontinuous), and the immersion time in the coating composition (the usage period of the coating composition) may be considered as the total time for which the metal part is actually immersed.

[0069] Therefore, according to the present invention, there is also provided a method for coating a metal part, comprising a coating step of immersing a metal part in the coating composition according to this embodiment, or immersing the metal part in the coating composition and irradiating it with ultrasonic waves, and a drying step of drying the metal part after the coating step. The drying of the metal part after immersion in the coating composition may be carried out by continuous heating or by intermittent (discontinuous) heating.

[0070] The temperature of the coating 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 immersing the metal part in the coating composition is preferably 1 minute to 3 hours, more preferably 3 minutes to 2 hours, and even more preferably 3 minutes to 1 hour. In addition, in the drying step after the coating step, the drying method may be such as placing the part in a hot air drying oven, a constant temperature bath, or a high-temperature, high-humidity bath. The drying temperature in the drying step is preferably 25 to 120°C, more preferably 40 to 120°C, even more preferably 50 to 115°C, and particularly preferably 60 to 110°C.

[0071] The cleaning composition and the coating composition according to this embodiment are applied to the entire threaded member or to a threaded portion, which is a part of the threaded member, and are then washed and dried to provide a rust-proofing treatment. More specifically, after immersing the metal part in the cleaning composition for one or more cleaning operations, the metal part is immersed in the coating composition and dried to form a coating film (coating) on ​​the surface of the metal part, completing the rust-proofing treatment. Although the cleaning composition also provides a rust-proofing treatment, further performing a rust-proofing treatment with the coating composition provides even more excellent rust prevention. Although the coating composition may be used to form a coating film (coating) immediately after the metal part has been cleaned with the cleaning composition, some time may pass between the cleaning of the metal part with the cleaning composition and the formation of a coating film (coating) with the coating composition. For example, after the completion of cleaning of the metal part with the cleaning composition, the coating film may be formed (coated) with the coating agent composition 10 minutes, 1 day (24 hours), 3 days (72 hours), 5 days (120 hours), or 7 days (168 hours).

[0072] Therefore, the present invention also provides a rust prevention method for metal parts, including: a cleaning step of immersing a metal part in the cleaning composition according to this embodiment and irradiating it with ultrasonic waves; a coating step of immersing the metal part in the coating composition according to this embodiment after the cleaning step, or immersing the metal part in the coating composition according to this embodiment and irradiating it with ultrasonic waves; and a drying step of drying the metal part after the coating step.

[0073] In this embodiment, the metal part may be a threaded member. Examples of the threaded member include, but are not limited to, screws, bolts, nipples having a threaded portion, threaded joints such as sockets, tapered plugs, and elbows, and the inner periphery of a nut. The material of the threaded member is mainly metal, such as iron, aluminum, gold, stainless steel, and SUS. These may also be plated with zinc chromate or other plating, and may have oil or other residue remaining on the threaded portion.

[0074] When cleaning with a cleaning composition and / or coating with a coating composition, an ultrasonic cleaner can be used to immerse a metal part (threaded member) in the cleaning composition and / or coating composition. Any ultrasonic cleaner can be used as long as it has an ultrasonic vibrator and a bath integrated into one unit. The bath can be maintained at a predetermined temperature (e.g., 25 to 60°C) using a heater or chiller.

[0075] After immersion in the cleaning composition and / or coating composition, the metal part (threaded member) can be dried by, for example, placing it in a hot air drying oven adjusted to an atmosphere of 25 to 120°C. The drying temperature for the metal part (threaded member) is preferably 40 to 120°C, more preferably 50 to 115°C, and even more preferably 60 to 110°C. Drying the metal part (threaded member) within the above temperature range allows the evaporation rate of the volatile components to be appropriately adjusted, improving rust prevention and suppressing the formation of rust on the metal part (threaded member). In addition, in the case of a coating composition, the evaporation rate of the volatile components is appropriately adjusted, forming a uniform coating film and further enhancing rust prevention. Furthermore, according to one embodiment, the drying time for the metal part (threaded member) in the hot air drying oven is preferably 5 minutes to 1 hour, more preferably 5 minutes to 30 minutes.

[0076] The present invention will be described in more detail below with reference to examples, but is not limited to these examples. Furthermore, the detergent composition will also be referred to simply as a detergent, and the coating composition will also be referred to simply as a coating agent. The detergent composition and the coating composition will also be collectively referred to as a composition.

[0077] [Examples 1 to 7, Comparative Examples 1 to 13] The following components were prepared to prepare compositions. The pH of component (A) or (A') was measured in the same manner as in measuring the pH of a cleaning agent or a coating agent, which will be described later.

[0078] Component (A): Water with a pH of 9.0 to 12.0 ・Alkaline electrolyzed water with a pH of 11.0 (adjusted using an alkaline electrolyzed water generator EW3000A manufactured by Amano Corporation) ・Alkaline aqueous solution 1 obtained by adjusting ion-exchanged water to pH 10.7 with ammonia water (hereinafter referred to as adjusted water 1) ・Alkaline aqueous solution 2 obtained by adjusting ion-exchanged water to pH 9.4 with ammonia water (hereinafter referred to as adjusted water 2) Component (A'): Water other than component (A) ・Ion-exchanged water with a pH of 6.3 Component (B): Sodium benzoate ・Rust inhibitor containing sodium benzoate as a rust-inhibiting component (Component (B): containing 10% by mass) (Ascotran HPB manufactured by ASCOTEC) ・Rust inhibitor containing sodium benzoate as a rust-inhibiting component (Component (B): containing 10% by mass) (Ascotran AL-4 manufactured by ASCOTEC) Component (B'): Sodium benzoate rust-inhibiting component Rust inhibitor containing 2-mercaptobenzothiazole as a rust-preventive component (component (B'): content 15 mass %) (Asconium 142 / DA, manufactured by ASCOTEC) Rust inhibitor containing 1,2,3-benzotriazole as a rust-preventive component (component (B'): content 15 mass %) (Asconium 112, manufactured by ASCOTEC) Component (C): emulsion particles dispersed in the composition Aqueous polymer acrylic emulsion (solid content corresponding to component (C): 45 mass %) (Newcoat KSB-1, manufactured by Shin-Nakamura Chemical Co., Ltd.; (meth)acrylic copolymer, non-self-crosslinking type, Tg: 0°C) Other components Nonionic surfactant (Noigen ET-115, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) Examples 1 to 3 and Comparative Examples 1 to 7 were prepared as cleaning agents. Component (A) (or component (A')) and component (B) (or component (B')) were weighed and placed in a stirring beaker and stirred for 10 minutes. Detailed amounts prepared are shown in Table 1, and all values ​​are expressed in parts by mass. In addition, for Examples 1 to 3 and Comparative Examples 1 to 7, the pH of the detergent was measured, and the appearance of the detergent and bolt corrosion check 1 were carried out. The results are summarized in Table 1.

[0079] [Measurement of pH of detergent] The pH of the detergent was measured at 25°C using a glass electrode pH meter (LAQUA D-210P, manufactured by HORIBA, Ltd.) and recorded as "pH of the detergent." The pH was measured in accordance with JIS Z 8802 (2011).

[0080] [Detergent Appearance Check] 40 parts by mass of the composition and four bolts (material: raw iron, product name: Hexagonal Bolt M10 x 20 Iron Fully Threaded (Kongo Byora Co., Ltd.), length: L dimension 20 mm, diameter: 10 mm) were placed in a 50 mL glass bottle with a lid, and the lid was closed. It was confirmed that the bolts were entirely immersed in the composition. All compositions were initially transparent. The glass bottles were left in a hot air drying oven set to an atmosphere of 80°C for one week. After removing the glass bottles from the hot air drying oven and returning to 25°C, they were visually inspected according to the following evaluation criteria, and the "appearance of the cleaner" was determined. From the viewpoint of continuous use without deterioration, a rating of "○" is preferable. Evaluation criteria ○: The composition remained transparent as initially; △: The composition remained transparent as initially, but precipitate occurred; ×: The composition was cloudy and precipitate occurred.

[0081] [Bolt Corrosion Confirmation 1] The bolts used in the above test were removed and left to dry in a hot air drying oven set to an atmosphere of 105°C for 8 minutes. Then, they were left in an environment of 85°C x 85% RH for 1 day. After that, the appearance was visually confirmed according to the following evaluation criteria, and it was designated as "Corrosion Confirmation 1". However, "△" or "×" in the above test was not confirmed and was marked as "-". Evaluation criteria ○: No rust occurred on the bolt surface; ×: Rust occurred all over the bolt surface.

[0082]

[0083] Examples 1 to 3, which used component (A) with a pH of 9.0 to 12.0, maintained the initial transparency of the cleaner's appearance compared to Comparative Examples 1 and 2, which used component (A') with a pH of less than 9.0. Comparative Examples 3 and 5 did not contain component (B), and Comparative Examples 6 and 7 contained rust inhibitors other than component (B). However, both cleaners were found to be cloudy or to produce precipitates. Furthermore, in Examples 1 to 3, the cleaner's appearance was rated "Good" and the bolt corrosion test 1 was also rated "Good," confirming that the cleaners could be used for a long period of time and also exhibited rust prevention effects on threaded parts. Comparative Example 4 showed a good cleaner appearance but an "Unclear" result in the bolt corrosion test 1. Even when ultrasonic treatment (e.g., 80°C x 4 minutes once, 40 Hz, etc.) was performed when immersing bolts in the cleaner, the cleaners of Examples 1 to 3 showed good results (both "Good") in the cleaner's appearance and in the bolt corrosion test 1.

[0084] Coating agents in Examples 4 to 7 and Comparative Examples 8 to 13 were prepared. Component (A) (or component (A')), component (B) (or component (B')), component (C), and other components were weighed and placed in a stirring beaker and stirred for 30 minutes. Detailed preparation amounts are shown in Table 2, with all values ​​expressed in parts by mass. Furthermore, coating agent pH measurements, coating agent appearance checks, and bolt corrosion check 2 were performed on Examples 4 to 7 and Comparative Examples 8 to 13. The results are also summarized in Table 2.

[0085] [Measurement of pH of coating agent] The pH of the coating agent was measured at 25°C using a glass electrode pH meter (LAQUA D-210P, manufactured by Horiba, Ltd.) and recorded as "pH of the coating agent." The pH measurement method complies with JIS Z 8802 (2011).

[0086] [Coating Appearance Confirmation] A bolt (material: raw iron, product name: Hexagonal Bolt M10 x 20 Iron Fully Threaded (Kongo Byora Co., Ltd.), length: L dimension 20 mm, diameter: 10 mm) cleaned with methylene chloride was used. 40 parts by mass of the composition and four of the above-mentioned cleaned bolts were placed in a 50 mL glass bottle with a lid, and the lid was closed. It was confirmed that the bolts were entirely immersed in the composition. All compositions were initially white. The glass bottle was left in a hot air drying oven set to an 80°C atmosphere for one week. After removing the glass bottle from the hot air drying oven and returning to 25°C, it was visually inspected according to the following evaluation criteria and recorded as the "coating agent appearance." From the perspective of continuous use without deterioration of the coating agent, a rating of "○" is preferable. Evaluation criteria ○: The composition remained its original white color; ×: The composition discolored to brown.

[0087] [Bolt Corrosion Confirmation 2] The bolts used in the above test were removed and left to dry in a hot air drying oven set to an atmosphere of 105°C for 8 minutes. Then, they were left in an environment of 85°C x 85% RH for 2 days. After that, the appearance was visually checked according to the following evaluation criteria, and the result was determined as "Corrosion Confirmation 2". Evaluation criteria: ○: No rust occurred on the bolt surface; △: Rust occurred partially on the bolt surface; ×: Rust occurred entirely on the bolt surface.

[0088]

[0089] Examples 4 to 7, which used component (A) with a pH of 9.0 to 12.0, maintained the initial white color of the coating appearance and were rated "Good" in bolt corrosion confirmation 2, compared to Comparative Example 11, which used component (A') with a pH of less than 9.0. Comparative Examples 8, 9, and 10 did not contain component (B), and although Comparative Example 10 was rated "Good" in the coating appearance, rust occurred in bolt corrosion confirmation 2. Comparative Examples 12 and 13 contained a rust inhibitor other than component (B), but discoloration occurred in the coating appearance and bolt corrosion confirmation 2 was rated "Good." In Examples 4 to 7, the coating appearance was rated "Good" and bolt corrosion confirmation 2 was rated "Good," confirming that the coating can be used for a long period of time and that the rust prevention effect on the threaded member was fully exerted for two days in a 105°C atmosphere. In this example, even when ultrasonic treatment (for example, 40°C x 4 minutes / time, 40 Hz, etc.) was performed when the bolts were immersed in the coating agent, the results of the coating agents of Examples 4 to 7 were confirmed to be good (both "Good") in terms of coating agent appearance and bolt corrosion test 2.

[0090] In addition, in this example, even when bolts cleaned with the cleaning agents of Examples 1 to 3 were coated with the coating agents of Examples 4 to 7, it was confirmed that the results of the coating agent appearance and bolt corrosion test 2 were good (both were "Good").

[0091] 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.

[0092] When a general cleaner is used, rust occurs in a much shorter time than one day when the threaded member is heated and dried after cleaning. However, by using the cleaner composition according to the present invention, the threaded member, which is a metal part, can be protected from rust even when heated and dried. Furthermore, by using the coating composition according to the present invention in combination, an even longer-lasting rust prevention effect can be achieved. The present invention can be used on the threaded member as a surface treatment before applying a so-called pre-coating agent that becomes reactive when threaded.

Claims

DEPCT691. The composition of the cleansing agent which consists of components (A) and components (B) as follows: Component (A): alkaline aquatic solution; and Component (B): sodium benzoate, in which the pH of the cleansing agent components is 8.0 to 11.

0.

2. The composition of the cleansing agent according to claim 1, in which the pH of component (A) is 9.0 to 12.

0.

3. The composition of the coating agent which consists of components (A) to components (C) as follows: Component (A): alkaline aquatic solution; Component (B): sodium benzoate; and Component (C): particles.

1. Emulsion composition, where the pH of the coating component is 8.0 to 11.

04. Coating composition according to claim 3, where the pH of component (A) is 9.0 to 12.

05. Coating composition according to claim 3, subsequently which includes: surfactant6. Coating composition according to claim 5 where the surfactant is a nonionic surfactant7. Coating composition according to claim 6 where the nonionic surfactant is a polyoxyethylene-based nonionic surfactant8.

9. Method for cleaning metal parts, which includes: the cleaning step of immersing the metal parts in the cleaning solution according to claim 1 and ultrasonic radiation; 10. Method for coating metal parts, which includes: the coating step of immersing the metal parts in the coating solution according to claim 3, and ultrasonic radiation; and the drying step of drying the metal parts after the coating step; 11. Method for rust prevention of metal parts, which includes: the cleaning step of immersing the metal parts in the cleaning solution according to claim 1 and ultrasonic radiation; the coating step of immersing the metal parts in the coating solution according to claim 3 after the cleaning step, and ultrasonic radiation; and the drying step of drying the metal parts after the coating step; 12.Methods for cleaning metal parts under claim number 9, where the metal part is a screw component; 13. Methods for surface coating of metal parts under claim number 10, where the metal part is a screw component; 14. Methods for rust prevention of metal parts under claim number 11, where the metal part is a screw component.