Rust preventive composition

Abstract

To provide a rust preventive composition that exhibits superior rust prevention performance, has reduced viscosity, and hardly remains as a liquid on a surface of a metallic article.SOLUTION: A rust preventive composition comprising an amine (component A), a salt (component B') of a dicarboxylic acid (component B) having 6 or more to 22 or less carbon atoms and the component A, a salt (component C') of a monocarboxylic acid (component C) having 8 or more to 21 or less carbon atoms and the component A, a salt (component D') of a monocarboxylic acid (component D) having 9 or more to 22 or less carbon atoms and having more carbon atoms than the component C and the component A, and water (component E).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a rust inhibitor composition. [Background technology]

[0002] Metals such as iron, copper, and aluminum are processed and used in industrial products in a variety of fields. Metals are oxidized by oxygen in the air and easily rust, so rust prevention treatments are generally performed on the metal surfaces of articles having metal parts (hereinafter also referred to as "metal articles"), such as by applying an oil-based rust inhibitor such as rust-preventive oil (for example, Patent Document 1 listed below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-164987 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, oil-based rust inhibitors have high rust-preventing properties, but when a metal article is treated with an oil-based rust inhibitor for rust prevention, it is necessary to remove any unnecessary oil-based rust inhibitor from the metal surface of the metal article immediately before work in a process subsequent to the process in which the rust prevention treatment was performed (for example, an assembly process in which the metal article is used as part of a component, hereinafter also referred to simply as a subsequent process), which increases the number of work steps.

[0005] To address this issue, one possible solution is to use a water-based rust inhibitor that can form a rust-preventive coating that does not need to be removed before subsequent work.

[0006] Metal articles that have been subjected to rust prevention treatment are often transported or stored for long periods of time. However, because the rust prevention performance of rust prevention coatings formed from conventional water-based rust inhibitors is insufficient, rust may develop on the surface of metal articles that have rust prevention coatings formed from conventional water-based rust inhibitors when transported for long periods of time.

[0007] Furthermore, because conventional aqueous rust inhibitors have high viscosity, liquid aqueous rust inhibitors may remain on the surface of metal articles subjected to subsequent processes. If the metal articles are subjected to subsequent processes with liquid aqueous rust inhibitor remaining on their surfaces, this is undesirable because it can cause operational defects in the subsequent processes and cause quality defects in products that include the metal articles as components.

[0008] An object of the present invention is to provide a rust inhibitor composition that has high rust prevention performance but low viscosity and is unlikely to remain in a liquid state on the surface of a metal article, as well as a method for producing an article that can impart high rust prevention performance to a metal article, and a method for rust prevention of an article. [Means for solving the problem]

[0009] The inventors discovered that the packing properties of components related to the liquid viscosity can be controlled by the combination of fatty acids, and gained the knowledge that the viscosity of the liquid can be suppressed while maintaining high rust-preventing performance by using a specific combination of carboxylic acids, thereby completing the present invention.

[0010] The present invention provides The rust inhibitor composition contains an amine (component A), a salt (component B') of a dicarboxylic acid (component B) having 6 to 22 carbon atoms with component A, a salt (component C') of a monocarboxylic acid (component C) having 8 to 21 carbon atoms with component A, a salt (component D') of a monocarboxylic acid (component D) having 9 to 22 carbon atoms and a carbon number greater than that of component C, and water (component E).

[0011] The present invention also provides The rust inhibitor composition is a mixture of an amine (component A), a dicarboxylic acid having 6 to 22 carbon atoms (component B), a monocarboxylic acid having 8 to 21 carbon atoms (component C), a monocarboxylic acid having 9 to 22 carbon atoms (component D) that has a carbon number greater than that of component C, and water (component E).

[0012] The present invention also provides a method for producing an article, comprising a rust prevention step of forming an anti-rust coating derived from the rust inhibitor composition on the metal surface of the metal article.

[0013] The present invention also provides a method for preventing rust on an article, comprising a rust prevention step of forming a rust-preventive coating derived from the rust inhibitor composition on the metal surface of the metal article. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a rust inhibitor composition that has high rust prevention performance but low viscosity and is unlikely to remain in a liquid state on the surface of a metal article, as well as a method for producing an article that can impart high rust prevention performance to a metal article, and a method for rust prevention of an article. DETAILED DESCRIPTION OF THE INVENTION

[0015] <Rust inhibitor composition> The rust inhibitor composition of this embodiment contains an amine (component A), a salt (component B') of a dicarboxylic acid (component B) having from 6 to 22 carbon atoms with component A, a salt (component C') of a monocarboxylic acid (component C) having from 8 to 21 carbon atoms with component A, a salt (component D') of a monocarboxylic acid (component D) having from 9 to 22 carbon atoms and having a carbon number greater than that of component C, and component A, and water (component E). The rust inhibitor composition of this embodiment has high rust prevention performance while having low viscosity, and is unlikely to remain in liquid form on the surface of a metal article.

[0016] [Amine (Component A)] The rust inhibitor composition contains an amine (component A).

[0017] From the viewpoint of improving rust-preventive performance on metals, the amine (component A) preferably includes at least one selected from alkanolamines and alkoxyalkylamines, and more preferably includes monoethanolamine, monoisopropanolamine, N-methylmonoisopropanolamine, N-ethylmonoethanolamine, N-ethylmonoisopropanolamine, N-phenylmonoethanolamine, N-phenylmonoisopropanolamine, N-benzylmonoethanolamine, N-benzylmonoisopropanolamine, diethanolamine, diisopropanolamine, N-dimethylmonoethanolamine, N-dimethylmonoisopropanolamine, N-methyldiethanolamine, N-methyldiisopropanolamine, N-diethylmonoethanolamine, N-diethylmonoisopropanolamine, N-ethyldiethanolamine, N-ethyldiisopropanolamine, The amine compound includes at least one selected from N-phenyldiethanolamine, N-phenyldiisopropanolamine, N-benzyldiethanolamine, N-benzyldiisopropanolamine, triethanolamine, N-(β-aminoethyl)monoethanolamine, N-(β-aminoethyl)monoisopropanolamine, N-(β-aminoethyl)diethanolamine, N-(β-aminoethyl)diisopropanolamine, 3-methoxypropylamine, and 2-amino-2-methyl-1-propanol, more preferably at least one selected from diisopropanolamine, diethanolamine, diisopropanolamine, triethanolamine, 3-methoxypropylamine, and 2-amino-2-methyl-1-propanol, and even more preferably at least one selected from triethanolamine, diisopropanolamine, and 3-methoxypropylamine.

[0018] From the viewpoint of improving rust-preventing performance against metals, the total content of alkanolamines and alkoxyalkylamines in the amine (component A) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass. In this specification, "substantially 100% by mass" means that the content includes the case where a trace amount of impurities is inevitably mixed in.

[0019] The amines (component A) include monoethanolamine, monoisopropanolamine, N-methylmonoisopropanolamine, N-ethylmonoethanolamine, N-ethylmonoisopropanolamine, N-phenylmonoethanolamine, N-phenylmonoisopropanolamine, N-benzylmonoethanolamine, N-benzylmonoisopropanolamine, diethanolamine, diisopropanolamine, N-dimethylmonoethanolamine, N-dimethylmonoisopropanolamine, N-methyldiethanolamine, N-methyldiisopropanolamine, N-diethylmonoethanolamine, N-diethylmonoisopropanolamine, N-ethyldiethanolamine, and N-ethyldiisopropanolamine. From the viewpoint of improving the rust-preventing performance on metals, the total content of ethanolamine, N-phenyldiethanolamine, N-phenyldiisopropanolamine, N-benzyldiethanolamine, N-benzyldiisopropanolamine, triethanolamine, N-(β-aminoethyl)monoethanolamine, N-(β-aminoethyl)monoisopropanolamine, N-(β-aminoethyl)diethanolamine, N-(β-aminoethyl)diisopropanolamine, 3-methoxypropylamine, and 2-amino-2-methyl-1-propanol is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0020] From the viewpoint of improving the rust prevention performance on metals, the total content of diethanolamine, diisopropanolamine, triethanolamine, 3-methoxypropylamine, and 2-amino-2-methyl-1-propanol in the amine (component A) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0021] From the viewpoint of improving the rust prevention performance against metals, the total content of triethanolamine and 3-methoxypropylamine in the amine (component A) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0022] The content of the amine (component A) in the rust inhibitor composition is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.5% by mass or more from the viewpoint of improving storage stability. The content of the amine (component A) in the rust inhibitor composition is preferably 5% by mass or less, more preferably 4.5% by mass or less, and even more preferably 4% by mass or less from the viewpoint of suppressing surface deterioration of metal articles.

[0023] [Salt (Component B') of a dicarboxylic acid having 6 to 22 carbon atoms (Component B) and Component A] From the viewpoint of improving rust-preventing performance against iron, the carbon number of the dicarboxylic acid (component B) is 6 or more, preferably 8 or more, more preferably 9 or more, and even more preferably 10 or more. From the viewpoint of improving rust-preventing performance against iron, the carbon number of the dicarboxylic acid (component B) is 22 or less, preferably 18 or less, and more preferably 14 or less.

[0024] The dicarboxylic acid (component B) is represented, for example, by the following general formula (I): The dicarboxylic acid (component B) may be used alone or in combination of two or more kinds. General formula (I): HOOC-R 1 -COOH (In general formula (I), R 1is an alkylene group having 4 to 20 carbon atoms.

[0025] From the viewpoint of improving the rust prevention performance against iron, the dicarboxylic acid (component B) preferably includes at least one selected from hexanedioic acid, 1,8-octanedicarboxylic acid, 1,10-decanedicarboxylic acid, 1,11-undecanedicarboxylic acid, and 1,12-dodecanedicarboxylic acid, and more preferably includes 1,10-decanedicarboxylic acid.

[0026] From the viewpoint of improving the rust-preventing performance against iron, the total content of hexanedioic acid, 1,8-octanedicarboxylic acid, 1,10-decanedicarboxylic acid, 1,11-undecanedicarboxylic acid, and 1,12-dodecanedicarboxylic acid in the dicarboxylic acid (component B) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0027] From the viewpoint of improving the rust-preventing performance against iron, the content of 1,10-decanedicarboxylic acid in the dicarboxylic acid (component B) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0028] Since the dicarboxylic acid (component B) and the amine (component A) form a salt in water, the rust inhibitor composition essentially contains a salt (component B') of the dicarboxylic acid (component B) and the amine (component A). The salt (component B') of the dicarboxylic acid (component B) and the amine (component A) may be used alone or in combination of two or more. The salt (component B') of the dicarboxylic acid (component B) and the amine (component A) may be prepared from a raw material that has already formed a salt.

[0029] The content of Component B' in the rust inhibitor composition is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, from the viewpoint of improving rust prevention performance for metals. The content of Component B' in the rust inhibitor composition is preferably 2% by mass or less, more preferably 1.8% by mass or less, even more preferably 1.7% by mass or less, and even more preferably 1.5% by mass or less, from the viewpoint of suppressing surface deterioration of metal articles.

[0030] [Salt (Component C') of a monocarboxylic acid having 8 to 21 carbon atoms (Component C) and Component A] The number of carbon atoms in the monocarboxylic acid (component C) is 8 or more from the viewpoint of improving the rust-preventive performance for metals. The number of carbon atoms in the monocarboxylic acid (component C) is 21 or less, preferably 17 or less, and more preferably 16 or less, from the viewpoint of reducing the viscosity of the rust inhibitor composition and preventing it from remaining in a liquid state on the surface of a metal article.

[0031] The monocarboxylic acid (component C) is represented, for example, by the following general formula (II): The monocarboxylic acid (component C) may be used alone or in combination of two or more kinds. General formula (II):R 2 -COOH (In general formula (II), R 2 is a linear or branched alkyl or alkenyl group having 7 to 20 carbon atoms, and is preferably linear from the viewpoint of improving rust prevention performance against metals.

[0032] From the viewpoint of reducing the viscosity of the rust inhibitor composition and preventing it from remaining in a liquid state on the surface of the metal article, the monocarboxylic acid (component C) preferably comprises at least one selected from saturated fatty acids such as caprylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, and arachidic acid; and unsaturated fatty acids such as palmitoleic acid, oleic acid, elaidic acid, cetoleic acid, erucic acid, brassidic acid, linoleic acid, linolenic acid, arachidonic acid, and stearic acid, more preferably at least one selected from palmitic acid, stearic acid, oleic acid, and linoleic acid, and even more preferably at least one selected from caprylic acid, lauric acid, myristic acid, and palmitic acid.

[0033] From the viewpoint of improving rust prevention performance against metals, the total content of saturated fatty acids and unsaturated fatty acids in the monocarboxylic acid (component C) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0034] From the viewpoint of improving rust prevention performance against metals, the total content of palmitic acid, stearic acid, isostearic acid, oleic acid, and linoleic acid in the monocarboxylic acid (component C) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0035] From the viewpoint of improving rust prevention performance against metals, the total content of caprylic acid, lauric acid, myristic acid, and palmitic acid in the monocarboxylic acid (component C) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0036] Since the monocarboxylic acid (component C) and the amine (component A) form a salt in water, the rust inhibitor composition essentially contains a salt (component C') of the monocarboxylic acid (component C) and the amine (component A). The salt (component C') of the monocarboxylic acid (component C) and the amine (component A) may be used alone or in combination of two or more. The salt (component C') of the monocarboxylic acid (component C) and the amine (component A) may be prepared from a raw material that has already formed a salt.

[0037] The content of Component C' in the rust inhibitor composition is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, from the viewpoint of reducing the viscosity of the rust inhibitor composition and preventing it from remaining in a liquid state on the surface of a metal article. The content of Component C' in the rust inhibitor composition is preferably 2% by mass or less, more preferably 1.5% by mass or less, and even more preferably 1% by mass or less, from the viewpoint of improving rust prevention performance on metals.

[0038] [A salt (component D') of component A with a monocarboxylic acid (component D) having 9 to 22 carbon atoms and a carbon number greater than that of component C] From the viewpoint of improving the rust-preventive performance on metals, the number of carbon atoms in the monocarboxylic acid (component D) is 9 or more, preferably 12 or more, more preferably 16 or more, and even more preferably 17 or more. From the viewpoint of reducing the viscosity of the rust inhibitor composition and preventing it from remaining in a liquid state on the surface of a metal article, the number of carbon atoms in the monocarboxylic acid (component D) is 22 or less, preferably 20 or less, and more preferably 19 or less.

[0039] The monocarboxylic acid (component D) is represented, for example, by the following general formula (III): The monocarboxylic acid (component D) may be used alone or in combination of two or more kinds. General formula (III):R 3 -COOH (In general formula (III), R 3 is a linear or branched alkyl or alkenyl group having 8 to 21 carbon atoms, and is preferably linear from the viewpoint of improving rust prevention performance against metals.

[0040] From the viewpoint of reducing the viscosity of the rust inhibitor composition and preventing it from remaining in a liquid state on the surface of the metal article, the monocarboxylic acid (component D) preferably includes at least one selected from saturated fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, arachidic acid, and behenic acid; and unsaturated fatty acids such as palmitoleic acid, oleic acid, elaidic acid, cetoleic acid, erucic acid, brassidic acid, linoleic acid, linolenic acid, arachidonic acid, and stearic acid, more preferably at least one selected from palmitic acid, stearic acid, isostearic acid, oleic acid, and linoleic acid, and even more preferably at least one selected from isostearic acid and oleic acid.

[0041] From the viewpoint of improving rust prevention performance against metals, the total content of saturated fatty acids and unsaturated fatty acids in the monocarboxylic acid (component D) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0042] From the viewpoint of improving rust prevention performance against metals, the total content of palmitic acid, stearic acid, isostearic acid, oleic acid, and linoleic acid in the monocarboxylic acid (component D) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0043] From the viewpoint of improving rust prevention performance against metals, the total content of isostearic acid and oleic acid in the monocarboxylic acid (component D) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably substantially 100% by mass.

[0044] Since the monocarboxylic acid (component D) and the amine (component A) form a salt in water, the rust inhibitor composition essentially contains a salt (component D') of the monocarboxylic acid (component D) and the amine (component A). The salt (component D') of the monocarboxylic acid (component D) and the amine (component A) may be used alone or in combination of two or more. The salt (component D') of the monocarboxylic acid (component D) and the amine (component A) may be prepared from a raw material that has already formed a salt.

[0045] The content of component D' in the rust inhibitor composition is preferably 0.1% by mass or more, more preferably 0.6% by mass or more, and even more preferably 1% by mass or more, from the viewpoint of improving rust prevention performance for metals. The content of component D' in the rust inhibitor composition is preferably 10% by mass or less, more preferably 4% by mass or less, and even more preferably 3% by mass or less, from the viewpoint of suppressing surface deterioration of metal articles.

[0046] The mass ratio of the content of Component B' to the content of Component A in the rust inhibitor composition (content of Component B' / content of Component A) is preferably 0.1 or more, more preferably 0.2 or more, more preferably 0.3 or more, and still more preferably 0.4 or more, from the viewpoint of improving storage stability. The mass ratio of the content of Component B' to the content of Component A in the rust inhibitor composition (content of Component B' / content of Component A) is preferably 5 or less, more preferably 3 or less, and still more preferably 2 or less, from the viewpoint of improving rust inhibitor performance on metals.

[0047] The mass ratio of the content of Component C' to the content of Component A in the rust inhibitor composition (content of Component C' / content of Component A) is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 0.2 or more, from the viewpoint of improving storage stability. The mass ratio of the content of Component C' to the content of Component A in the rust inhibitor composition (content of Component C' / content of Component A) is preferably 5 or less, more preferably 3 or less, and even more preferably 1 or less, from the viewpoint of improving rust inhibitor performance on metals.

[0048] From the viewpoint of improving storage stability, the mass ratio of the content of component D' to the content of component A in the rust inhibitor composition (content of component D' / content of component A) is preferably 0.1 or more, more preferably 0.5 or more, and still more preferably 1 or more. From the viewpoint of improving rust inhibitor performance on metals, the mass ratio of the content of component D' to the content of component A in the rust inhibitor composition (content of component D' / content of component A) is preferably 10 or less, more preferably 7 or less, and still more preferably 5 or less.

[0049] The mass ratio of the content of component D' to the content of component C' in the rust inhibitor composition (content of component D' / content of component C') is preferably 0.5 or more, more preferably 1.5 or more, even more preferably 2 or more, and still more preferably 2.5 or more, from the viewpoint of reducing the viscosity of the rust inhibitor composition and preventing it from remaining in a liquid state on the surface of a metal article. The mass ratio of the content of component D' to the content of component C' in the rust inhibitor composition (content of component D' / content of component C') is preferably 10 or less, more preferably 9.5 or less, and still more preferably 9 or less, from the viewpoint of improving rust prevention performance on metals.

[0050] The total content of Component C' and Component D' in the rust inhibitor composition is preferably 0.5% by mass or more, more preferably 0.6% by mass or more, and even more preferably 0.7% by mass or more, from the viewpoint of improving rust prevention performance for metals. The total content of Component C' and Component D' in the rust inhibitor composition is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less, from the viewpoint of suppressing surface deterioration of metal articles.

[0051] The mass ratio of the content of Component B' to the total content of Component C' and Component D' in the rust inhibitor composition (content of Component B' / (content of Component C'+content of Component D')) is preferably 0.02 or more, more preferably 0.1 or more, and even more preferably 0.2 or more, from the viewpoint of improving rust inhibitory performance against metals. The mass ratio of the content of Component B' to the total content of Component C' and Component D' in the rust inhibitor composition (content of Component B' / (content of Component C'+content of Component D')) is preferably 4 or less, more preferably 1 or less, and even more preferably 0.5 or less, from the viewpoint of improving rust inhibitory performance against metals.

[0052] [Water (ingredient E)] The water (component E) can be industrial water, tap water, pure water, deionized water, distilled water, etc., and from the viewpoint of improving the rust prevention performance on metals, at least one selected from pure water, deionized water, and distilled water is preferred, with pure water being more preferred.

[0053] The content of Component E in the rust inhibitor composition is preferably 80% by mass or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more from the viewpoint of concentration. The content of Component E in the rust inhibitor composition is preferably 99% by mass or less, more preferably 98% by mass or less from the viewpoint of improving rust prevention performance for metals.

[0054] [Other ingredients] The rust inhibitor composition may contain components other than the components A to E that are generally used as rust inhibitors, to the extent that the components do not affect the performance. Examples of such components include solubilizers, dispersants, thickeners such as thickeners, antifoaming agents, preservatives, and colorants.

[0055] From the viewpoint of ease of handling, the viscosity of the rust inhibitor composition at 25°C is preferably 0.80 mPa·s or more, more preferably 0.85 mPa·s or more, and even more preferably 0.90 mPa·s or more. From the viewpoint of preventing the rust inhibitor composition from remaining in a liquid state on the surface of a metal article, the viscosity of the rust inhibitor composition at 25°C is preferably 2.75 mPa·s or less, more preferably 2.50 mPa·s or less, and even more preferably 2.25 mPa·s or less. In this specification, the viscosity of the rust inhibitor composition is measured by the method described in the Examples.

[0056] [Concentrate of Rust Inhibitor Composition] The rust inhibitor composition may be prepared as a concentrate in which the amount of component E is reduced to the extent that separation, precipitation, or the like does not occur and storage stability is not impaired. The rust inhibitor composition concentrate is preferably a concentrate diluted 3 times or more from the viewpoint of transportation and storage, and is preferably a concentrate diluted 30 times or less from the viewpoint of storage stability. The rust inhibitor composition concentrate can be used by diluting it with water so that each component has the above-mentioned content (i.e., the content at the time of rust prevention treatment) when used. Furthermore, the rust inhibitor composition concentrate can also be used by adding each component separately when used. In the present disclosure, the term "when used" for the concentrated rust inhibitor composition refers to the diluted state of the rust inhibitor composition concentrate.

[0057] The rust inhibitor composition can be produced by blending the above-mentioned components by a known method. That is, the rust inhibitor composition may be a rust inhibitor composition obtained by blending the above-mentioned components A, B, C, D, and E. The term "blending" as used herein includes mixing the above-mentioned components simultaneously or in any order.

[0058] From the viewpoint of composition stability, the blending amount of the component A is preferably 0.1% by mass or more, more preferably 1% by mass or more, and even more preferably 1.5% by mass or more. From the viewpoint of suppressing surface deterioration of the metal article and improving storage stability, the blending amount of the component A is preferably 10% by mass or less, more preferably 6% by mass or less, and even more preferably 5% by mass or less.

[0059] From the viewpoint of improving the rust prevention performance for metals, the blending amount of the component B is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more. From the viewpoint of suppressing surface deterioration of metal articles, the blending amount of the component B is preferably 1% by mass or less, more preferably 0.9% by mass or less, and even more preferably 0.8% by mass or less.

[0060] The amount of component C is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, from the viewpoint of reducing the viscosity of the rust inhibitor composition and preventing it from remaining in a liquid state on the surface of a metal article, and is preferably 1% by mass or less, more preferably 0.9% by mass or less, and even more preferably 0.8% by mass or less, from the viewpoint of improving rust prevention performance on metals.

[0061] From the viewpoint of improving the rust prevention performance for metals, the blending amount of the component D is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 0.7% by mass or more. From the viewpoint of suppressing surface deterioration of metal articles, the blending amount of the component D is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 2.5% by mass or less.

[0062] The mass ratio of the amount of component D to the amount of component C (amount of component D / amount of component C) is preferably 0.5 or more, more preferably 1.5 or more, even more preferably 2 or more, and still more preferably 2.5 or more, from the viewpoint of improving rust-preventive performance on metals. The mass ratio of the amount of component D to the amount of component C (amount of component D / amount of component C) is preferably 10 or less, more preferably 9.5 or less, and still more preferably 9 or less, from the viewpoint of reducing the viscosity of the rust inhibitor composition and preventing it from remaining in a liquid state on the surface of a metal article.

[0063] The total amount of the components C and D is preferably 0.4% by mass or more, more preferably 0.5% by mass or more, and even more preferably 0.6% by mass or more, from the viewpoint of improving the rust-preventive performance for metals. The total amount of the components C and D is preferably 5% by mass or less, more preferably 4.5% by mass or less, and even more preferably 4% by mass or less, from the viewpoint of reducing the viscosity of the rust-preventive composition to prevent it from remaining in a liquid state on the surface of a metal article and from the viewpoint of preventing surface deterioration of the metal article.

[0064] The mass ratio of the amount of component B to the total amount of component C and component D (amount of component B / (amount of component C+amount of component D)) is preferably 0.02 or more, more preferably 0.1 or more, and even more preferably 0.2 or more, from the viewpoint of improving rust-preventive performance against metals. The mass ratio of the amount of component B to the total amount of component C and component D (amount of component B / (amount of component C+amount of component D)) is preferably 5 or less, more preferably 1 or less, and even more preferably 0.5 or less, from the viewpoint of improving rust-preventive performance against metals.

[0065] From the viewpoint of concentration, the blending amount of the component E is preferably 80% by mass or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more. From the viewpoint of improving the rust prevention performance for metals, the blending amount of the component E is preferably 99% by mass or less, and more preferably 98% by mass or less.

[0066] The rust inhibitor composition may contain other components, other than the components A to E, that are generally used as rust inhibitors, within a range that does not affect performance. Examples of such other components include solubilizers, dispersants, thickeners such as thickeners, antifoaming agents, preservatives, and colorants.

[0067] <Kit> The kit of this embodiment relates to a kit for producing the rust inhibitor composition (hereinafter also referred to as the "kit of the present disclosure"). Examples of the kit of the present disclosure include a kit (two-component rust inhibitor composition) that contains a solution (first component) containing Component A, Component B', and Component E and a solution (second component) containing Component A, Component C', Component D', and Component E in a mutually unmixed state, and that is mixed at the time of use. After the first and second components are mixed, they may be diluted with water or an aqueous solution as needed. The first or second component may contain all or a portion of the water used to prepare the rust inhibitor composition. The first and second components may each contain the optional components described above as needed. The kit of the present disclosure allows the preparation of a rust inhibitor composition with excellent storage stability.

[0068] <Method for manufacturing an article and method for preventing rust of an article> The method for manufacturing an article and the method for rust prevention of a metal article of this embodiment include a rust prevention step of forming a rust-preventive coating derived from the rust inhibitor composition on the metal surface of the metal article. The metal article is not particularly limited, and examples thereof include metal articles made of iron members such as steel and cast iron; metal articles made of non-ferrous metal members such as copper, zinc, aluminum, and alloys of these metals; and metal articles that are composites of the iron members and the non-ferrous metal members.

[0069] [Rust prevention process] In the rust prevention step, the method for forming a rust-preventive coating derived from the rust inhibitor composition on the metal surface of a metal article is not particularly limited. For example, the rust prevention step may include a contacting step of bringing the rust inhibitor composition into contact with the metal surface of the metal article, and a drying step of drying the metal article having the rust inhibitor composition on its metal surface.

[0070] [Contact process] In the contacting step, a method for contacting the metal surface of the metal article with the rust inhibitor composition containing Component A, Component B', Component C', Component D', and Component E is not particularly limited, and can be performed by a known method. Examples of the method for contacting the metal surface of the metal article with the rust inhibitor composition include spraying, dropping, or applying the rust inhibitor composition onto the surface of the metal article, or immersing the metal article in the rust inhibitor composition.

[0071] [Drying process] In the drying step, the method for drying the metal article having the rust inhibitor composition on the surface thereof is not particularly limited, and the metal article can be dried by a known method.

[0072] From the viewpoints of reducing energy costs and environmental impact, the drying temperature in the drying step is preferably 100° C. or lower, more preferably 90° C. or lower, and even more preferably 80° C. or lower. Since the detergent composition has excellent drying properties at room temperature, the drying temperature may be 30° C. or lower. From the viewpoint of improving productivity, the drying temperature is preferably 10° C. or higher, and more preferably 20° C. or higher.

[0073] The drying step may be a step of removing excess cleaning composition from the metal article by air purging or the like, followed by drying. In this case, the temperature of the air blow is preferably 20°C or higher, more preferably 30°C or higher, and even more preferably 40°C or higher, from the viewpoint of improving productivity, and is preferably 100°C or lower, more preferably 90°C or lower, and even more preferably 80°C or lower, from the viewpoint of reducing energy costs and environmental load.

[0074] The rust inhibitor composition can be used as a rust inhibitor. The metal articles that can be treated for rust prevention with the rust inhibitor composition are not particularly limited, and examples thereof include transportation machinery such as automobiles, bicycles, trains, ships, and airplanes, home appliances such as televisions, air conditioners, and refrigerators, electronic devices such as mobile terminals and computers, and metal products and metal parts that are used as raw materials for tableware and beverage cans. [Example]

[0075] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0076] <Examples 1 to 10 and Comparative Examples 1 and 2> [Preparation of Rust Inhibitor Composition] Rust inhibitor compositions were prepared by blending the raw materials listed in Table 1. The content of each component was calculated from the blended amount of the raw materials. The contents of Components A, B', C', and D' were calculated on the assumption that all of the carboxy groups of Components B, C, and D were bonded to Component A via ionic bonds.

[0077] The components listed in Table 1 were as follows: (amine) Triethanolamine: 2,2',2"-nitrilotriethanol, manufactured by Kishida Chemical Co., Ltd. Diisopropanolamine: manufactured by Tokyo Chemical Industry Co., Ltd. 3-Methoxypropylamine: Fujifilm Wako Pure Chemical Industries, Ltd. (dicarboxylic acid) 1,10-Decanedicarboxylic acid: Tokyo Chemical Industry Co., Ltd. (carbon number: 12) (monocarboxylic acid) Palmitic acid: Kao Corporation, Lunac P-95 (carbon number: 16) Myristic acid: Kao Corporation, Lunac MY-98 (carbon number: 14) Lauric acid: Kao Corporation, Lunac L-98 (carbon number: 12) Caprylic acid: Kao Corporation, Lunac 8-98 (carbon number: 8) Oleic acid: Nacalai Tesque, oleic acid (carbon number: 18) Isostearic acid: Isostearic acid EX (carbon number: 18), manufactured by High Alcohol Co., Ltd. (water) Deionized water (Yamato Scientific, purified with WGH200)

[0078] [Evaluation method] [pH measurement] The pH of the rust inhibitor composition at a liquid temperature of 25°C was measured using a pH electrode (HM-30G, manufactured by DKK-Toa Corporation).

[0079] [Accelerated rust prevention test] 100 g of the rust inhibitor composition was mixed into a 100 mL glass beaker, and a steel plate (SPCC, 50 mm x 50 mm x 0.8 mm) that had been degreased and cleaned with acetone was immersed in the rust inhibitor composition for 30 seconds. The steel plate was removed and dried with air blowing. The substrate was placed upright in a 30 L polypropylene box-type container, which simulates a returnable box for transporting metal goods, and the container was placed in a high-temperature, high-humidity chamber set at a temperature of 60°C and a humidity of 95% RH. The steel plate surface was visually observed every 12 hours, and the time until rust appeared on the steel plate was measured.

[0080] [Viscosity measurement] 100 mL of each solution in the Examples and Comparative Examples was left to stand for 30 minutes at 25° C., and then measured using a Brookfield viscometer. The lower the viscosity, the less likely it is to remain in liquid form on the surface of a metal article.

[0081] The evaluation results are shown in Table 1.

[0082] [Table 1]

Claims

1. The rust inhibitor composition contains an amine (component A), a salt (component B') of a dicarboxylic acid (component B) having from 6 to 22 carbon atoms with the component A, a salt (component C') of a monocarboxylic acid (component C) having from 8 to 21 carbon atoms with the component A, a salt (component D') of a monocarboxylic acid (component D) having from 9 to 22 carbon atoms and having a carbon number greater than that of the component C, and water (component E).

2. 2. The rust inhibitor composition according to claim 1, wherein a mass ratio of the content of said component D' to the content of said component C' (content of component D' / content of component C') is 0.5 or more and 10 or less.

3. The rust inhibitor composition according to claim 1, wherein the content of the component A is 0.1% by mass or more and 5% by mass or less.

4. 2. The rust inhibitor composition according to claim 1, wherein the content of said component B' is 0.1% by mass or more and 2% by mass or less.

5. 2. The rust inhibitor composition according to claim 1, wherein the content of said component C' is 0.1% by mass or more and 2% by mass or less.

6. 2. The rust inhibitor composition according to claim 1, wherein the content of said component D' is 0.1% by mass or more and 10% by mass or less.

7. 2. The rust inhibitor composition according to claim 1, wherein the content of said component E is 80% by mass or more and 99% by mass or less.

8. 2. The rust inhibitor composition according to claim 1, wherein a mass ratio of a content of said component B' to a total content of said component C' and said component D' (content of component B' / (content of component C'+content of component D')) is 0.02 or more and 4 or less.

9. The rust inhibitor composition comprises an amine (component A), a dicarboxylic acid (component B) having 6 to 22 carbon atoms, a monocarboxylic acid (component C) having 8 to 21 carbon atoms, a monocarboxylic acid (component D) having 9 to 22 carbon atoms and having a carbon number greater than that of component C, and water (component E).

10. The rust inhibitor composition according to claim 9, wherein a mass ratio of the amount of component D to the amount of component C (amount of component D / amount of component C) is 1 or more and 10 or less.

11. The rust inhibitor composition according to claim 9, wherein the blending amount of the component A is 0.1% by mass or more and 10% by mass or less.

12. 10. The rust inhibitor composition according to claim 9, wherein a mass ratio of the blending amount of the component B to the total blending amount of the component C and the component D (blending amount of component B / (blending amount of component C+blending amount of component D)) is 0.02 or more and 5 or less.

13. A method for producing an article, comprising a rust prevention step of forming an anticorrosive coating derived from the rust inhibitor composition according to any one of claims 1 to 12 on a metal surface of the article having a metal part.

14. A method for rust prevention of an article, comprising a rust prevention step of forming an anticorrosive coating derived from the rust inhibitor composition according to any one of claims 1 to 12 on a metal surface of the article having a metal part.

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