Rust preventive composition

Abstract

To provide a rust preventive composition that can suppress lowering of the friction coefficient on a metal surface due to a rust preventive coating.SOLUTION: A rust preventive composition comprising an amine (component A) having a molecular weight of 30 or more to 140 or less represented by the following general formula (I), 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 22 or less carbon atoms and the component A, and water (component D). (In the general formula (I), R1 is a hydrocarbon group having 1 or more to 20 or less carbon atoms with a hydroxy group or an ether group, and R2 is a hydrocarbon group having 1 or more to 20 or less carbon atoms with a hydroxy group or an ether group, or hydrogen.)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 the use of an aqueous rust inhibitor that can form a rust-preventive coating that does not need to be removed before subsequent work.When a metal article has been rust-prevented with an aqueous rust inhibitor composition, the metal article may be used before a subsequent process, such as an assembly process, without removing the rust-preventive coating derived from the aqueous rust inhibitor composition from the surface of the metal article.In such cases, the coefficient of friction on the surface of the metal article is reduced by the rust-preventive coating derived from the aqueous rust inhibitor composition, and fasteners such as bolts and nuts that secure the metal article or are secured to the metal article may become more likely to come off or may suffer from tightening problems.

[0006] Furthermore, it is important that the rust inhibitor composition for forming the rust-preventive coating has stability as a composition, taking into consideration the ease of transportation, storage period, and use.

[0007] An object of the present invention is to provide a rust inhibitor composition that can suppress a decrease in the coefficient of friction of a metal surface caused by a rust-preventive coating, as well as a method for producing an article and a method for rust prevention of an article. [Means for solving the problem]

[0008] The present invention provides The rust inhibitor composition contains an amine (component A) having a molecular weight of 30 to 140 and represented by the following general formula (I), a salt (component B') of a dicarboxylic acid (component B) having 6 to 22 carbon atoms with the component A, a salt (component C') of a monocarboxylic acid (component C) having 8 to 22 carbon atoms with the component A, and water (component D). [ka] (In the general formula (I), R 1 is a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxyl group or an ether group, and R 2 is a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxyl group or an ether group, or hydrogen.

[0009] The present invention also provides The rust inhibitor composition is a compound comprising an amine (component A) having a molecular weight of 30 to 140 and represented by the general formula (I), a dicarboxylic acid (component B) having 6 to 22 carbon atoms, a monocarboxylic acid having a hydrocarbon group having 7 to 21 carbon atoms (component C), and water (component D).

[0010] 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.

[0011] 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]

[0012] According to the present invention, it is possible to provide a rust inhibitor composition that can suppress a decrease in the coefficient of friction of a metal surface caused by a rust-preventive coating, as well as a method for producing an article and a method for rust prevention of an article. DETAILED DESCRIPTION OF THE INVENTION

[0013] <Rust inhibitor composition> The rust inhibitor composition of the present embodiment contains an amine (component A) having a molecular weight of 30 to 140 and represented by the following general formula (I), a salt (component B') of component A with a dicarboxylic acid (component B) having 6 to 22 carbon atoms, a salt (component C') of component A with a monocarboxylic acid (component C) having 8 to 22 carbon atoms, and water (component D). [ka] (In the general formula (I), R 1 is a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxyl group or an ether group, and R 2 is a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxyl group or an ether group, or hydrogen.

[0014] The rust inhibitor composition of this embodiment can suppress a decrease in the coefficient of friction of a metal surface due to a rust-preventive coating. Although the reason why the rust inhibitor composition exhibits such an effect is not clear, it is presumed that the salt (component B') of the dicarboxylic acid (component B) and the amine (component A) and the salt (component C') of the monocarboxylic acid (component C) and the amine (component A) act on iron, and the salt (component C') of the monocarboxylic acid (component C) and the amine (component A) act on non-ferrous metals such as aluminum and copper, thereby suppressing a decrease in the coefficient of friction of a metal surface due to a rust-preventive coating.

[0015] [Amine (Component A)] The rust inhibitor composition contains an amine (component A) represented by the general formula (I) and having a molecular weight of 30 or more and 140 or less.

[0016] The molecular weight of the amine (component A) is 140 or less, preferably 100 or less, from the viewpoint of suppressing a decrease in the coefficient of friction of the metal surface due to the rust-preventive coating derived from the rust inhibitor composition. The molecular weight of the amine (component A) is 30 or more, preferably 50 or more, from the viewpoint of suppressing the odor of the amine.

[0017] In the general formula (I), R 1 is a hydrocarbon group having 1 to 20 carbon atoms, and the hydrocarbon group has a hydroxy group or an ether group. 1 is preferably a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxy group.

[0018] In the general formula (I), R 1 The number of carbon atoms in the hydrocarbon group is 20 or less, preferably 10 or less, and more preferably 4 or less, from the viewpoint of improving storage stability.

[0019] In the general formula (I), R 2 is a hydrocarbon group having 1 to 20 carbon atoms, or hydrogen, and the hydrocarbon group has a hydroxy group or an ether group. 2 is preferably a hydrocarbon group having 1 to 20 carbon atoms and a hydroxy group, or hydrogen.

[0020] In the general formula (I), R 2 The number of carbon atoms in the hydrocarbon group is 20 or less, preferably 10 or less, and more preferably 4 or less, from the viewpoint of improving storage stability.

[0021] From the viewpoint of improving rust-preventing performance on metals, the amine (component A) preferably includes at least one alkanolamine selected from monoethanolamine, monoisopropanolamine, diethanolamine, and diisopropanolamine, and at least one alkoxyalkylamine selected from 2-methoxyethylamine, 2-ethoxyethylamine, 2-isopropoxyethylamine, 2-isobutoxyethylamine, 2-tert-butoxyethylamine, 2-(2-ethylhexyloxy)ethylamine, 2-(2-butylhexyloxy)ethylamine, 2-decyloxyethylamine, 2-dodecyloxyethylamine, 2-tetradecyloxyethylamine, 2-stearyloxyethylamine, 2-oleyloxyethylamine, 3-methoxypropylamine, 3-ethoxypropylamine, 3-isopropoxypropylamine, 3-isobutoxypropylamine, and 3-tert-butoxypropylamine, and more preferably includes at least one selected from monoethanolamine and diethanolamine.

[0022] 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.

[0023] From the viewpoint of improving the rust prevention performance on metals, the total content of monoethanolamine and diethanolamine 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.

[0024] From the viewpoint of improving storage stability, 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 0.3% by mass or more.

[0025] The content of the amine (component A) in the rust inhibitor composition is preferably 50% by mass or less, more preferably 30% by mass or less, and even more preferably 20% by mass or less from the viewpoint of improving storage stability. The content of the amine (component A) in the rust inhibitor composition is preferably 4% by mass or less, more preferably 3.5% by mass or less, and even more preferably 3% by mass or less from the viewpoint of suppressing surface deterioration of metal articles.

[0026] [Salt (Component B') of a dicarboxylic acid having 6 to 22 carbon atoms (Component B) and Component A] From the viewpoint of improving rust-preventive performance against metals, the carbon number of the dicarboxylic acid (component B) is 6 or more, preferably 8 or more, more preferably 9 or more, and more preferably 10 or more. From the viewpoint of improving rust-preventive performance against metals, the carbon number of the dicarboxylic acid (component B) is 22 or less, preferably 18 or less, and more preferably 14 or less.

[0027] The dicarboxylic acid (component B) is represented, for example, by the following general formula (II): The dicarboxylic acid (component B) may be used alone or in combination of two or more kinds. General formula (II): HOOC-R 3 -COOH (In general formula (II), R 3 is an alkylene group having 4 to 20 carbon atoms.

[0028] 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.

[0029] 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.

[0030] From the viewpoint of improving the rust prevention 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.

[0031] 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.

[0032] 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 against metals.

[0033] The content of Component B' in the rust inhibitor composition is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less from the viewpoint of improving storage stability. 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 1.5% by mass or less, and even more preferably 1% by mass or less from the viewpoint of suppressing a decrease in the coefficient of friction of a metal surface due to a rust-preventive coating derived from the rust inhibitor composition.

[0034] The mass ratio of the amount of component A to the amount of component B in the rust inhibitor composition (amount of component B' / amount of component A) is preferably 0.01 or more, more preferably 0.05 or more, even more preferably 0.1 or more, and still more preferably 0.15 or more, from the viewpoint of improving storage stability. The mass ratio of the amount of component A to the amount of component B in the rust inhibitor composition (amount of component B / amount of component A) is preferably 2 or less, more preferably 1.5 or less, even more preferably 1 or less, and still more preferably 0.5 or less, from the viewpoint of improving rust prevention performance on metals.

[0035] The mass ratio of the content of Component A to the content of Component B' in the rust inhibitor composition (content of Component B' / content of Component A) is preferably 0.01 or more, more preferably 0.1 or more, even more preferably 0.15 or more, and still more preferably 0.2 or more, from the viewpoint of improving storage stability. The mass ratio of the content of Component A to the content of Component B' in the rust inhibitor composition (content of Component B' / content of Component A) is preferably 2 or less, more preferably 1.5 or less, even more preferably 1 or less, and still more preferably 0.8 or less, from the viewpoint of improving rust prevention performance on metals.

[0036] [Salt (Component C') of a monocarboxylic acid having 8 to 22 carbon atoms (Component C) and Component A] From the viewpoint of improving rust-preventive performance against metals, the number of carbon atoms in the monocarboxylic acid (component C) is 8 or more, preferably 12 or more, more preferably 16 or more, and even more preferably 17 or more. From the viewpoint of improving rust-preventive performance against metals, the number of carbon atoms in the monocarboxylic acid (component C) is 22 or less, preferably 20 or less, and more preferably 19 or less.

[0037] The monocarboxylic acid (component C) is represented, for example, by the following general formula (III): The monocarboxylic acid (component C) may be used alone or in combination of two or more kinds. General formula (III):R 4 -COOH (In general formula (III), R 4 is a linear or branched alkyl or alkenyl group having 7 to 21 carbon atoms, and is preferably linear from the viewpoint of improving rust prevention performance against metals.

[0038] From the viewpoint of improving rust-preventing performance on metals, the monocarboxylic acid (component C) preferably contains 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 contains at least one selected from palmitic acid, stearic acid, isostearic acid, oleic acid, and linoleic acid, and even more preferably contains at least one selected from isostearic acid and oleic acid.

[0039] 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.

[0040] 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.

[0041] From the viewpoint of improving rust prevention performance against metals, the total content of isostearic acid and oleic 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.

[0042] 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.

[0043] The content of Component C' 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 0.9% by mass or more, from the viewpoint of improving rust prevention performance against metals.

[0044] The content of Component C' in the rust inhibitor composition is preferably 50% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less from the viewpoint of improving storage stability. The content of Component C' in the rust inhibitor composition is preferably 5% 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 a decrease in the coefficient of friction of a metal surface due to a rust-preventive coating derived from the rust inhibitor composition.

[0045] From the viewpoint of improving storage stability, the mass ratio of the amount of component A to the amount of component C in the rust inhibitor composition (amount of component A / amount of component C) is preferably 0.01 or more, more preferably 0.1 or more, even more preferably 0.5 or more, still more preferably 1 or more, and still more preferably 2 or more. From the viewpoint of improving rust prevention performance on metals, the mass ratio of the amount of component A to the amount of component C in the rust inhibitor composition (amount of component A / amount of component C) is preferably 10 or less, more preferably 8 or less, and still more preferably 7 or less.

[0046] The mass ratio of the content of Component A to the content of Component C' in the rust inhibitor composition (content of Component A / content of Component C') is preferably 0.01 or more, more preferably 0.05 or more, even more preferably 0.1 or more, and still more preferably 0.15 or more, from the viewpoint of improving storage stability. The mass ratio of the content of Component A' to the content of Component C' in the rust inhibitor composition (content of Component A / content of Component C') is preferably 2 or less, more preferably 1.5 or less, even more preferably 1.3 or less, even more preferably 1.1 or less, and still more preferably 1 or less, from the viewpoint of improving rust prevention performance on metals.

[0047] The mass ratio of the amount of component B to the amount of component C in the rust inhibitor composition (amount of component B / amount of component C) is preferably 0.01 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 amount of component B to the amount of component C in the rust inhibitor composition (amount of component B / amount of component C) is preferably 2 or less, more preferably 1.5 or less, even more preferably 1 or less, and even more preferably 0.5 or less, from the viewpoint of improving rust prevention performance on metals.

[0048] The mass ratio of the content of Component B' to the content of Component C' in the rust inhibitor composition (content of Component B' / content of Component C') is preferably 0.1 or more, and more preferably 0.2 or more, from the viewpoint of improving storage stability. The mass ratio of the content of Component B' to the content of Component C' in the rust inhibitor composition (content of Component B' / content of Component C') is preferably 2 or less, more preferably 1.4 or less, even more preferably 1.3 or less, even more preferably 1.1 or less, and even more preferably 0.5 or less, from the viewpoint of improving rust prevention performance on metals.

[0049] [Water (ingredient D)] The water (component D) 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.

[0050] The content of component D in the rust inhibitor composition is preferably 10% by mass or more, more preferably 40% by mass or more, and even more preferably 50% by mass or more from the viewpoint of improving storage stability. The content of component D 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 suppressing a decrease in the coefficient of friction of a metal surface due to a rust-preventive coating derived from the rust inhibitor composition.

[0051] The content of the component D in the rust inhibitor composition is preferably 97% by mass or less, and more preferably 96% by mass or less, from the viewpoint of improving rust prevention performance against metals.

[0052] [Other ingredients] The rust inhibitor composition may contain other components besides the components A to D that are generally used as rust inhibitors, to the extent that the components do not affect the performance of the composition. Examples of such other components include solubilizers, dispersants, thickeners such as thickeners, antifoaming agents, preservatives, and colorants.

[0053] 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 components A, B, C, and D. The term "blending" as used herein includes mixing the above-mentioned components simultaneously or in any order.

[0054] From the viewpoint of improving storage stability, the blending amount of the component A is preferably 0.5% by mass or more, more preferably 1% by mass or more, and even more preferably 1.5% by mass or more.

[0055] From the viewpoint of improving storage stability, the blending amount of Component A is preferably 60% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less. From the viewpoint of suppressing a decrease in the coefficient of friction of the metal surface due to the rust preventive coating derived from the rust inhibitor composition, the blending amount of Component A is preferably 5% by mass or less, more preferably 3.5% by mass or less, and even more preferably 3% by mass or less.

[0056] The amount of 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 improving rust prevention performance on metals.

[0057] From the viewpoint of improving storage stability, the blending amount of the component B is preferably 10% by mass or less, more preferably 7% by mass or less, and even more preferably 5% by mass or less. From the viewpoint of suppressing a decrease in the coefficient of friction of the metal surface due to the rust preventive coating derived from the rust inhibitor composition, the blending amount of the component B is preferably 1% by mass or less, more preferably 0.9% by mass or less, even more preferably 0.8% by mass or less, and even more preferably 0.5% by mass or less.

[0058] From the viewpoint of improving rust prevention performance for metals, the blending amount of the component C is preferably 0.3% by mass or more, more preferably 0.5% by mass or more, even more preferably 0.7% by mass or more, and even more preferably 1% by mass or more.

[0059] From the viewpoint of improving storage stability, the blending amount of Component C is preferably 40% by mass or less, more preferably 30% by mass or less, and even more preferably 20% by mass or less. From the viewpoint of suppressing a decrease in the coefficient of friction of the metal surface due to the rust preventive coating derived from the rust inhibitor composition, the blending amount of Component C is preferably 4% by mass or less, more preferably 3% by mass or less, and even more preferably 2.5% by mass or less.

[0060] From the viewpoint of improving storage stability, the mass ratio of the amount of component C to the amount of component B (amount of component B / amount of component C) is preferably 0.1 or more, more preferably 0.15 or more, and even more preferably 0.2 or more. From the viewpoint of improving rust prevention performance on metals, the mass ratio of the amount of component C to the amount of component B (amount of component B / amount of component C) is preferably 1.5 or less, more preferably 1 or less, even more preferably 0.8 or less, even more preferably 0.5 or less, and even more preferably 0.3 or less.

[0061] From the viewpoint of improving storage stability, the blending amount of the component D is preferably 10% by mass or more, more preferably 40% by mass or more, and even more preferably 50% by mass or more. From the viewpoint of suppressing a decrease in the coefficient of friction of the metal surface due to the rust preventive coating derived from the rust inhibitor composition, the blending amount of the component D is preferably 80% by mass or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more.

[0062] The amount of component D is preferably 97% by mass or less, and more preferably 96% by mass or less, from the viewpoint of suppressing a decrease in the coefficient of friction of the metal surface due to the rust preventive coating derived from the rust preventive composition.

[0063] The rust inhibitor composition may contain other components, other than the components A to D, 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.

[0064] <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 D and a solution (second component) containing Component A, Component C', and Component D 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.

[0065] <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.

[0066] [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.

[0067] [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', and Component D can be used without any particular limitation, and can be 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 to the surface of the metal article, or immersing the metal article in the rust inhibitor composition.

[0068] [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.

[0069] 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.

[0070] 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.

[0071] 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]

[0072] 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.

[0073] <Examples 1-1 to 1-2 and Comparative Example 1-1> [Preparation of Rust Inhibitor Composition] The components were mixed and stirred in the amounts shown in Table 1 to prepare rust inhibitor compositions according to Examples 1-1 to 1-2 and Comparative Example 1-1, each containing the components in the amounts shown in Table 1. The values ​​shown in Table 1 represent the amounts of the active ingredients, and are expressed in mass%.

[0074] The components listed in Table 1 were as follows: (amine) Diethanolamine: Fujifilm Wako Pure Chemical Industries, Ltd., diethanolamine (molecular weight: 105.1) Monoethanolamine: Fujifilm Wako Pure Chemical Industries, Ltd., 2-aminoethanol (molecular weight: 61.08) Triethanolamine: 2,2',2"-nitrilotriethanol (molecular weight: 149.19), manufactured by Kishida Chemical Co., Ltd. (dicarboxylic acid) 1,10-Decanedicarboxylic acid: Tokyo Chemical Industry Co., Ltd. (carbon number: 12) (monocarboxylic acid) Oleic acid: Nacalai Tesque, oleic acid (carbon number: 18) Myristic acid: Kao Corporation, Lunac MY-98 (carbon number: 14) Lauric acid: Kao Corporation, Lunac L-98 (carbon number: 12) (water) Deionized water (Yamato Scientific, purified with WGH200)

[0075] [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).

[0076] [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.

[0077] [Friction coefficient measurement test] A specified rust inhibitor (aqueous solution; if it is not soluble in water, an ethanol aqueous solution) was applied to either a ball (SAE-AMS6440 steel, manufactured by PCS Instruments) or a disk ((Grade 28 per ISO3290) of SAE-AMS6440 steel, manufactured by PCS Instruments) that had been degreased with hexane, and then dried. The test was then placed in a diesel oil-lubricated friction tester (HFRR, manufactured by PCS). The temperature was 27°C, the frequency was 10 Hz, the load was 10 g, the travel distance was 2000 μm, the measurement interval was 1 second, and the measurement time was 1800 seconds. The average of the measured values ​​was taken as the friction coefficient.

[0078] The evaluation results are shown in Table 1.

[0079] [Table 1]

[0080] <Examples 2-1 to 2-2 and Comparative Example 2-1> [Preparation of Rust Inhibitor Composition and Evaluation of Stability] Water, amine, dicarboxylic acid, and monocarboxylic acid were added to a 100 mL glass vial in the amounts shown in Table 2, in that order, and stirred at room temperature for 6 hours. After leaving the solution to stand at room temperature for 24 hours, the appearance of the solution was observed and visually checked for separation of the components.

[0081] The evaluation results are shown in Table 2.

[0082]

Table 2

Claims

1. The rust inhibitor composition contains an amine (component A) having a molecular weight of 30 to 140 and represented by the following general formula (I): a salt (component B') of a dicarboxylic acid (component B) having 6 to 22 carbon atoms with the component A; a salt (component C') of a monocarboxylic acid (component C) having 8 to 22 carbon atoms with the component A; and water (component D). 【Chemical 1】 (In the general formula (I), R １ is a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxy group or an ether group, and R ２ is a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxy group or an ether group, or hydrogen.

2. The rust inhibitor composition according to claim 1, wherein the content of the component A is 0.1% by mass or more and 50% by mass or less.

3. 2. The rust inhibitor composition according to claim 1, wherein the content of Component B' is 0.1% by mass or more and 20% by mass or less.

4. 2. The rust inhibitor composition according to claim 1, wherein the content of said component C' is 0.1% by mass or more and 50% by mass or less.

5. 2. The rust inhibitor composition according to claim 1, wherein the content of component D is 10% by mass or more and 97% by mass or less.

6. 2. The rust inhibitor composition according to claim 1, wherein a mass ratio of the content of said component B' to the content of said component C' (content of component B' / content of component C') is 0.1 or more and 2 or less.

7. A rust inhibitor composition comprising an amine (component A) having a molecular weight of 30 to 140 and represented by the following general formula (I), a dicarboxylic acid (component B) having 6 to 22 carbon atoms, a monocarboxylic acid having a hydrocarbon group having 7 to 21 carbon atoms (component C), and water (component D). 【Chemistry 2】 (In the general formula (I), R １ is a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxy group or an ether group, and R ２ is a hydrocarbon group having 1 to 20 carbon atoms and having a hydroxy group or an ether group, or hydrogen.

8. The rust inhibitor composition according to claim 7, wherein the blending amount of the component A is 0.5% by mass or more and 60% by mass or less.

9. 9. The rust inhibitor composition according to claim 8, wherein a mass ratio of the amount of component C to the amount of component B (amount of component B / amount of component C) is 0.1 or more and 1.5 or less.

10. A method for producing an article, comprising a rust prevention step of forming an anti-rust coating derived from the rust inhibitor composition according to any one of claims 1 to 9 on a metal surface of the article having a metal part.

11. 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 according to any one of claims 1 to 9 on a metal surface of the article having a metal part.

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