Water soluble rust preventive composition

Abstract

To provide a water soluble rust preventive composition which is excellent in rust prevention property and in which a formed film is thin.SOLUTION: There is provided a water soluble rust preventive composition in which, at least, components (A) to (D) are blended: the component (A) is at least one carboxylic acid-based compound which is selected from, a branched dicarboxylic acid having C8 to C24, an anhydride of the branched dicarboxylic acid having C8 to C24, a polyvalent carboxylic acid which is formed by polymerizing one or more selected from an unsaturated carboxylic acid having C8 to C24 and an unsaturated hydroxy carboxylic acid having C8 to C24, and an acid modified olefin wax which has one or more functional groups selected from a carboxy group and anhydride carboxylic acid group; the component (B) is alkylene glycol mono-hydrocarbyl ether; the component (C) is alkanolamine; the component (D) is water.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] Metal materials such as steel sheets are processed into intermediate products and final molded products through multiple processes, and rust inhibitors are usually applied to prevent oxidation deterioration of the metal surface. From the viewpoint of rust prevention, oil-based rust inhibitors have been used traditionally, and various oil-based rust inhibitors have been proposed (for example, see Patent Document 1, etc.). In recent years, water-soluble rust inhibitors have also been used from the viewpoints of (1) suppressing stickiness caused by oil to improve the working environment, (2) thinning the rust inhibitor film (hereinafter also referred to as "film") after drying to suppress stickiness on the metal surface caused by the film, (3) making the film easy to remove in a subsequent process (it can be washed away with water) or being able to use the film directly in the next process without removing it in a subsequent process, thereby eliminating the need for a degreasing process, and (4) being economical because it can be diluted with water before use (see, for example, Patent Document 2, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-76565 A [Patent Document 2] Japanese Patent Application Publication No. 9-3667 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the water-soluble rust inhibitor composition has low rust-preventing properties and is currently limited to use in inter-process rust prevention. Therefore, from the viewpoint of enabling use in applications other than inter-process rust prevention, it is desired to develop a water-soluble rust inhibitor composition with improved rust-preventing properties. Here, from the viewpoint of enhancing the rust prevention, it is conceivable to make the film thicker, but if the film is made thicker, the metal surface is likely to become sticky, and the advantage of using the water-soluble rust inhibitor composition is lost. Therefore, the water-soluble rust inhibitor composition is required to have excellent rust prevention properties while forming a thin film.

[0005] An object of the present invention is to provide a water-soluble rust inhibitor composition which has excellent rust-preventing properties but forms a thin film. [Means for solving the problem]

[0006] According to the present invention, the following [1] and [2] are provided. [1] A water-soluble rust inhibitor composition comprising at least the following components (A) to (D): Component (A): one or more carboxylic acid compounds selected from the group consisting of branched dicarboxylic acids having 8 to 24 carbon atoms; anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polyvalent carboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic anhydride groups. Component (B): Alkylene glycol monohydrocarbyl ether Ingredient (C): Alkanolamine ·Component (D): Water [2] A method for producing a water-soluble rust inhibitor composition, comprising the step of mixing the following components (A) to (D): Component (A): one or more carboxylic acid compounds selected from the group consisting of branched dicarboxylic acids having 8 to 24 carbon atoms; anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polyvalent carboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic anhydride groups. Component (B): Alkylene glycol monohydrocarbyl ether Ingredient (C): Alkanolamine ·Component (D): Water Effect of the Invention

[0007] According to the present invention, it is possible to provide a water-soluble rust inhibitor composition which has excellent rust prevention properties but forms a thin coating film. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The upper and lower limit values ​​of the numerical ranges described in this specification can be combined in any way. For example, when "A to B" and "C to D" are described as numerical ranges, the numerical ranges "A to D" and "C to B" are also included in the scope of the present invention. In addition, unless otherwise specified, a numerical range of "lower limit value to upper limit value" described in this specification means not less than the lower limit value and not more than the upper limit value. In this specification, the numerical values ​​in the examples are numerical values ​​that can be used as upper or lower limits.

[0009] [Embodiments of Water-Soluble Rust Inhibitor Composition] The water-soluble rust inhibitor composition of the present embodiment comprises at least the following components (A) to (D) (the following component (A), the following component (B), the following component (C), and the following component (D)). Component (A): one or more carboxylic acid compounds selected from the group consisting of branched dicarboxylic acids having 8 to 24 carbon atoms; anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polyvalent carboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic anhydride groups. Component (B): Alkylene glycol monohydrocarbyl ether Ingredient (C): Alkanolamine ·Component (D): Water

[0010] The present inventors have conducted extensive research in order to solve the above problems. As a result, the present inventors discovered that a water-soluble rust inhibitor composition comprising components (A) to (D) has excellent rust prevention properties while forming a thin coating film, and after further investigations, they have completed the present invention. The reason why the water-soluble rust inhibitor composition of the present embodiment has excellent rust prevention properties yet forms a thin film is not clear, but is presumed to be due to the following mechanism. That is, when a water-soluble rust inhibitor composition containing components (A) to (D) is diluted with water and applied to a metal surface, the multiple carboxy groups of the carboxylic acid compound constituting component (A) are adsorbed to the metal surface. Then, when the multiple carboxy groups are adsorbed to the metal surface, the groups (e.g., alkyl groups and alkenyl groups, etc.) present between the multiple carboxy groups form a dense hydrophobic rust-preventive film on the metal surface. It is presumed that this causes each of the carboxylic acid compounds constituting component (A) to be efficiently adsorbed to the entire metal surface in a manner that allows them to exhibit rust-preventive properties, and in combination with the actions of components (B), (C), and further (D), a thin film with excellent rust-preventive properties is formed.

[0011] In this embodiment, the water-soluble rust inhibitor composition specified as "a water-soluble rust inhibitor composition comprising at least components (A) to (D)" includes not only "a water-soluble rust inhibitor composition containing at least components (A) to (D)", but also "a water-soluble rust inhibitor composition which contains, instead of one or more components selected from components (A) to (C), a modified product of the component, and which contains component (D)" and / or "a water-soluble rust inhibitor composition which contains not only components (A) to (C) but also a reaction product of two or more components selected from components (A) to (C), and which contains component (D)". The water-soluble rust inhibitor composition of the present embodiment may contain components other than the components (A) to (D) (hereinafter also referred to as “other components”) within the range that does not impair the effects of the present invention.

[0012] Each component contained in the water-soluble rust inhibitor composition of the present embodiment will be described in detail below. In the following description, the "water-soluble rust inhibitor composition" will also be referred to simply as "rust inhibitor."

[0013] <Component (A)> The rust inhibitor of the present embodiment contains component (A). Component (A) is one or more carboxylic acid compounds selected from the group consisting of branched dicarboxylic acids having 8 to 24 carbon atoms; anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polyvalent carboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic anhydride groups. If component (A) is not included, the rust prevention properties will be insufficient. The component (A) may be used alone or in combination of two or more kinds.

[0014] (Branched dicarboxylic acid with 8 to 24 carbon atoms) The branched dicarboxylic acid having 8 to 24 carbon atoms is, for example, preferably at least one selected from the group consisting of alkylsuccinic acids having 8 to 24 carbon atoms and alkenylsuccinic acids having 8 to 24 carbon atoms. The alkylsuccinic acid having 8 to 24 carbon atoms is a succinic acid having an alkyl group having 4 to 20 carbon atoms. The number of carbon atoms in the alkyl group is preferably 6 to 20, more preferably 7 to 16, and even more preferably 8 to 12, from the viewpoint of easily improving rust prevention properties and water solubility. The alkyl group may be linear or branched, but is preferably linear from the viewpoint of facilitating improvement of rust prevention properties. The alkenyl succinic acid having 8 to 24 carbon atoms is a succinic acid having an alkenyl group having 4 to 20 carbon atoms. The number of carbon atoms in the alkenyl group is preferably 6 to 20, more preferably 7 to 20, and even more preferably 8 to 18, from the viewpoint of easily improving rust prevention properties and water solubility. The alkenyl group may be linear or branched, but is preferably linear from the viewpoint of facilitating improvement of rust prevention properties.

[0015] Here, the branched dicarboxylic acid having 8 to 24 carbon atoms may be an anhydride. Since the rust inhibitor of this embodiment contains components (C) and (D), even if an anhydride of a branched dicarboxylic acid having 8 to 24 carbon atoms is added to the rust inhibitor, the anhydride undergoes a hydrolysis reaction to produce a branched dicarboxylic acid having 8 to 24 carbon atoms. Therefore, even if an anhydride of a branched dicarboxylic acid having 8 to 24 carbon atoms is added, the same effect as when a branched dicarboxylic acid having 8 to 24 carbon atoms is added is achieved.

[0016] The anhydride of a branched dicarboxylic acid having 8 to 24 carbon atoms is preferably at least one selected from the group consisting of alkylsuccinic anhydrides having 8 to 24 carbon atoms and alkenylsuccinic anhydrides having 8 to 24 carbon atoms.

[0017] Specific examples of alkylsuccinic acids having 8 to 24 carbon atoms, alkylsuccinic anhydrides having 8 to 24 carbon atoms, alkenylsuccinic acids having 8 to 24 carbon atoms, and alkenylsuccinic anhydrides having 8 to 24 carbon atoms include octylsuccinic anhydride, octenylsuccinic acid and its anhydride, dodecylsuccinic acid and its anhydride, dodecenylsuccinic acid and its anhydride, hexadecylsuccinic acid and its anhydride, hexadecenylsuccinic acid and its anhydride, octadecylsuccinic acid and its anhydride, and octadecenylsuccinic acid and its anhydride.

[0018] (Polycarboxylic Acid) The polycarboxylic acid is obtained by polymerizing one or more kinds selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms (preferably unsaturated carboxylic acids having 8 to 24 carbon atoms or unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms). The polyvalent carboxylic acid preferably includes a dimer acid obtained by dimerizing an unsaturated carboxylic acid having 8 to 24 carbon atoms, and a trimer acid obtained by trimerizing an unsaturated carboxylic acid having 8 to 24 carbon atoms. In addition, a condensate obtained by polycondensing an unsaturated hydroxycarboxylic acid having 8 to 24 carbon atoms (for example, preferably a condensate of ricinoleic acid (degree of polymerization 3)) can be used. The number of monomers of the polyvalent carboxylic acid is not particularly limited, but is preferably 2-10, and more preferably 2-5. These may be used alone or in combination of two or more. From the viewpoint of availability, the polycarboxylic acid may be a mixture of a plurality of polycarboxylic acids having different numbers of monomers. For example, a polycarboxylic acid obtained by polymerizing a generally available unsaturated carboxylic acid having 8 to 24 carbon atoms may be a mixture of a dimer acid and a trimer acid. From the viewpoint of improving the effects of the present invention, it is preferable that the polycarboxylic acid obtained by polymerizing an unsaturated carboxylic acid having 8 to 24 carbon atoms contains a trimer acid.

[0019] (Acid-modified olefin wax) The acid-modified olefin wax is an olefin wax having one or more functional groups selected from the group consisting of a carboxy group and a carboxylic anhydride group. The acid-modified olefin wax can be obtained by post-treating an olefin wax with a compound having a carboxy group and / or a carboxylic anhydride (preferably maleic acid and / or maleic anhydride), or by copolymerizing an α-olefin with a compound having a carboxy group and / or a carboxylic anhydride (preferably maleic acid and / or maleic anhydride) that is copolymerizable with the α-olefin when polymerizing or copolymerizing the α-olefin. Examples of α-olefins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 1-heneicosene, 1-docosene, 1-tricosene, 1-tetracosene, 1-pentacosene, 1-hexacosene, 1-heptacosene, 1-octacosene, and 1-nonacosene. The aliphatic hydrocarbon group constituting the acid-modified olefin wax may be linear or branched, and may include one or more bonds selected from the group consisting of unsaturated bonds, ester bonds, and ether bonds.

[0020] (Preferred embodiment of component (A)) In the rust inhibitor of the present embodiment, the component (A) preferably contains one or more selected from the group consisting of alkylsuccinic acids having 8 to 24 carbon atoms; alkylsuccinic anhydrides having 8 to 24 carbon atoms; alkenylsuccinic acids having 8 to 24 carbon atoms; alkenylsuccinic anhydrides having 8 to 24 carbon atoms; polycarboxylic acids obtained by polymerizing unsaturated carboxylic acids having 8 to 24 carbon atoms; polycarboxylic acids obtained by polymerizing unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic anhydride groups. The content of these components in component (A) is, based on the total amount of component (A), preferably 50% by mass to 100% by mass, more preferably 60% by mass to 100% by mass, even more preferably 70% by mass to 100% by mass, still more preferably 80% by mass to 100% by mass, even more preferably 90% by mass to 100% by mass, and even more preferably 95% by mass to 100% by mass.

[0021] <Ingredient (B)> The rust inhibitor of the present embodiment contains component (B). Component (B) is an alkylene glycol monohydrocarbyl ether. If component (B) is not blended, the rust prevention properties will be insufficient, and separation of the active ingredient will be likely to occur in the water-soluble rust inhibitor composition and in its diluted solution. Component (B) has the function of improving the wettability of the water-soluble rust inhibitor composition, and it is presumed that this function enables the water-soluble rust inhibitor composition to be applied uniformly to a metal surface, thereby enabling the formation of a thin coating with excellent rust prevention properties. The component (B) may be used alone or in combination of two or more kinds.

[0022] As the alkylene glycol monohydrocarbyl ether, alkylene glycol monohydrocarbyl ethers used in water-soluble rust inhibitor compositions, alkylene glycol monohydrocarbyl ethers used in water-soluble metal working oil compositions, etc. can be appropriately used. From the viewpoints of easily improving rust prevention, easily forming a thin film, and water solubility, the rust inhibitor of this embodiment preferably has component (B) as a compound represented by the following general formula (1). The compound represented by the following general formula (1) may be used alone or in combination of two or more.

[0023] [ka] [In the general formula (1), each symbol represents the following.] R 11 represents an alkyl group having 1 to 10 carbon atoms. R 12 represents an alkylene group having 1 to 10 carbon atoms. Each m1 independently represents an integer of 1 to 10.

[0024] R 11 The number of carbon atoms in the alkyl group that can be selected as the alkyl group is preferably 2 to 10, more preferably 3 to 8, and even more preferably 4 to 6, from the viewpoints of easily improving rust prevention, easily making the coating film that is formed thin, and water solubility. R 11The alkyl group that may be selected as may be straight-chain or branched-chain. R 11 The alkyl group that can be selected for is preferably an n-hexyl group or an n-butyl group.

[0025] R 12 The number of carbon atoms in the alkylene group that can be selected as is preferably 2 to 6, more preferably 2 to 4, even more preferably 2 to 3, and still more preferably 2, from the viewpoints of facilitating improved rust prevention, facilitating the formation of a thinner coating, water solubility, and ease of availability of the compound represented by the general formula (1). R 12 The alkylene group that can be selected as may be linear or branched. R 12 The alkylene group that can be selected as is preferably an ethylene group, a propylene group, or a butylene group, more preferably an ethylene group or a propylene group, and even more preferably an ethylene group. In addition, when m1 is 2 or more, there are multiple R 12 may be the same or different, but are preferably the same from the viewpoint of availability of the compound represented by the above general formula (1), etc.

[0026] From the viewpoints of easily improving rust prevention properties, easily forming a thinner coating, water solubility, and ease of availability of the compound represented by general formula (1), m1 is preferably an integer of 1 to 5, more preferably an integer of 1 to 4, and even more preferably an integer of 1 to 3.

[0027] Examples of the compound represented by the above general formula (1) include diethylene glycol mono-n-butyl ether, diethylene glycol isobutyl ether, diethylene glycol mono-n-hexyl ether, triethylene glycol mono-n-butyl ether, and propylene glycol mono-n-butyl ether. Among these, diethylene glycol mono-n-butyl ether and diethylene glycol mono-n-hexyl ether are preferred.

[0028] <Ingredient (C)> The rust inhibitor composition of the present embodiment contains component (C). Component (C) is an alkanolamine. If component (C) is not included, the rust prevention properties will be insufficient. It is presumed that the incorporation of component (C) improves the solubility of component (A) in the water-soluble rust inhibitor composition, thereby improving the rust prevention properties. The component (C) may be used alone or in combination of two or more kinds.

[0029] As the alkanolamine, alkanolamines used in water-soluble rust inhibitor compositions, alkanolamines used in water-soluble metal-working oil compositions, and the like can be appropriately used. Here, the alkanolamine may be one or more selected from the group consisting of monoalkanolamines, dialkanolamines, and trialkanolamines, but from the viewpoint of improving rust prevention, the alkanolamine is preferably a compound represented by the following general formula (2): The compound represented by the following general formula (2) may be used alone or in combination of two or more.

[0030] [ka] [In the general formula (2), each symbol represents the following.] R 21 represents a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms. R 22 represents an alkylene group having 1 to 10 carbon atoms. n1 is an integer from 0 to 2. n2 is an integer from 1 to 3. However, n1+n2=3.

[0031] In addition, in the above general formula (2), when n1 is 2 and n2 is 1, the compound represented by the above general formula (2) is a monoalkanolamine. In the above general formula (2), when n1 is 1 and n2 is 2, the compound represented by the above general formula (2) is a dialkanolamine. In the above general formula (2), when n1 is 0 and n2 is 3, the compound represented by the above general formula (2) is a trialkanolamine.

[0032] R 21 Examples of the hydrocarbon group that can be selected as the alkyl group include an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, and an aromatic hydrocarbon group. From the viewpoint of easily improving rust prevention properties, an aliphatic hydrocarbon group or an alicyclic hydrocarbon group is preferred. R 21 The number of carbon atoms in the hydrocarbon group that can be selected as is preferably 1 to 12, more preferably 1 to 8, and even more preferably 1 to 6, from the viewpoints of facilitating improvement in rust prevention properties, water solubility, and the like. R 21 Examples of the hydrocarbon group that can be selected for include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, etc. These may be linear or branched. In addition, the propyl group, the butyl group, the pentyl group, the hexyl group, etc. may have a cyclic structure. R 21 is preferably a hydrogen atom, a methyl group, or a cyclohexyl group. In addition, when n1 is 2 or more, there are multiple R 21 may be the same or different.

[0033] R 22 The number of carbon atoms of the alkylene group that can be selected for is preferably 2 to 6, more preferably 2 to 4, even more preferably 2 to 3, and still more preferably 2, from the viewpoint of facilitating improvement of rust prevention and water solubility. R 12 The alkylene group that can be selected as may be linear or branched. R 12The alkylene group that can be selected as is preferably an ethylene group, a propylene group, or a butylene group, more preferably an ethylene group or a propylene group, and even more preferably an ethylene group. In addition, when n2 is 2 or more, there are multiple R 22 may be the same or different, but are preferably the same from the viewpoint of availability of the compound represented by the above general formula (2), etc.

[0034] The alkanolamine may be one or more selected from the group consisting of monoalkanolamines, dialkanolamines, and trialkanolamines. From the viewpoint of availability, etc., the alkanolamine is preferably one or more selected from the group consisting of monoalkanolamines and dialkanolamines. Therefore, n1 is preferably an integer of 1 or 2, and n2 is preferably an integer of 1 or 2, provided that n1+n2=3.

[0035] The compound represented by the above general formula (2) is preferably at least one selected from the group consisting of N-methylethanolamine, N-methyldiethanolamine, and N-cyclohexyldiethanolamine.

[0036] In the rust inhibitor of the present embodiment, the amount of component (A) relative to the total amount of components (A), (B), and (C) [A / (A+B+C)], expressed by mass ratio, is preferably 0.05 to 0.80, more preferably 0.10 to 0.80, even more preferably 0.20 to 0.70, and still more preferably 0.30 to 0.65.

[0037] In the rust inhibitor of the present embodiment, the amount of component (B) relative to the total amount of components (A), (B), and (C) [B / (A+B+C)], expressed by mass ratio, is preferably 0.10 to 0.80, more preferably 0.12 to 0.60, and even more preferably 0.14 to 0.40. ​​

[0038] <C / (A+B+C)> In the rust inhibitor of the present embodiment, the amount of component (C) relative to the total amount of components (A), (B), and (C) [C / (A+B+C)], expressed by mass ratio, is preferably 0.10 to 0.80, more preferably 0.15 to 0.75, and even more preferably 0.20 to 0.70.

[0039] In the rust inhibitor of the present embodiment, the amount of component (A) to the amount of component (B) [A / B] is preferably 0.3 to 5.0, more preferably 1.0 to 4.5, and even more preferably 1.2 to 4.0, in mass ratio.

[0040] In the rust inhibitor of the present embodiment, the amount of component (B) relative to the amount of component (C) [B / C] is preferably 0.1 to 2.0, more preferably 0.2 to 1.5, and even more preferably 0.25 to 1.0, in terms of mass ratio.

[0041] <Ingredient (D)> The water as component (D) is not particularly limited, and may be purified water such as distilled water or ion-exchanged water (deionized water); tap water; industrial water; or the like. Purified water is preferred, and ion-exchanged water (deionized water) is more preferred.

[0042] The amount of component (D) to be added varies depending on the type of rust inhibitor. In general, rust inhibitors are used by diluting the original solution with water. Therefore, the amount of component (D) to be added is as follows, depending on the type of rust inhibitor: (1) When the rust inhibitor is undiluted When the rust inhibitor is in the form of a concentrate, it is diluted with water before use. In this case, the amount of component (D) is 1 to 30 parts by mass per 100 parts by mass of the total amount of components (A) to (C). (2) When the rust inhibitor is diluted with water When the rust inhibitor is diluted with water (diluted solution), the dilution is applied to the metal surface to form a coating. In this case, the amount of component (D) is preferably 100 to 5000 parts by mass, more preferably 100 to 3000 parts by mass, even more preferably 100 to 2000 parts by mass, and even more preferably 100 to 1500 parts by mass, based on 100 parts by mass of the total amount of components (A) to (C). However, the amount of component (D) in (2) includes the amount of water used for dilution.

[0043] <Other ingredients> The water-soluble rust inhibitor composition of the present embodiment may further contain other components in addition to the components (A) to (D) to the extent that the effects of the present invention are not impaired. Examples of other components include antioxidants, antifoaming agents, aluminum discoloration inhibitors, and copper deactivators. The other components may be used alone or in combination of two or more. The content of each of the other components may be appropriately adjusted within a range that does not impair the effects of the present invention, but is usually 0.1 to 10 parts by mass, preferably 0.2 to 5 parts by mass, and more preferably 0.5 to 3 parts by mass, relative to 100 parts by mass of the total amount of components (A) to (C).

[0044] [Physical properties of water-soluble rust inhibitor composition] The preferred physical properties of the water-soluble rust inhibitor composition of the present embodiment are as follows.

[0045] <Rust prevention> The water-soluble rust inhibitor composition of this embodiment has a rust prevention period, as measured by the method described in the Examples below, of preferably more than 1 week, more preferably 2 weeks or more, even more preferably 3 weeks or more, and still more preferably more than 3 weeks.

[0046] <Adhesion> The water-soluble rust inhibitor composition of the present embodiment has an adhesion of preferably 0.3 g / m 2 less than 0.1 g / m 2 More preferably, 0.1 g / m or less 2 is less than.

[0047] <Acid number / base number ratio> The water-soluble rust inhibitor composition of this embodiment has a ratio of acid value to base value [acid value / base value], measured by the method described in the Examples below, of preferably 0.05 to 0.97, more preferably 0.10 to 0.95, and even more preferably 0.15 to 0.93.

[0048] [Method of producing water-soluble rust inhibitor composition] The method for producing the water-soluble rust inhibitor composition of the present embodiment is not particularly limited. For example, a method for producing the lubricating oil composition of this embodiment includes a step of mixing the following components (A) to (D). Component (A): one or more carboxylic acid compounds selected from the group consisting of anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polyvalent carboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic anhydride groups. Component (B): Alkylene glycol monohydrocarbyl ether Ingredient (C): Alkanolamine ·Component (D): Water

[0049] The order of mixing components (A) to (D) is not particularly limited, but it is preferable to mix components (A) and (B) simultaneously or separately into a mixture obtained by mixing components (C) and (D). In addition to the components (A) to (D), other components may also be added. The preferred embodiments of each of the above components are as described above.

[0050] [Uses of water-soluble rust inhibitor composition] The water-soluble rust inhibitor composition of the present embodiment has excellent rust prevention properties, but also forms a thin film. Therefore, the water-soluble rust inhibitor composition of this embodiment is diluted with water in the above-mentioned "(1) when the rust inhibitor is a concentrate" and then applied directly to a metal surface in the above-mentioned "(2) when the rust inhibitor is diluted with water," thereby forming a thin film on the surface of the metal material and exhibiting excellent rust prevention properties. Therefore, according to the present embodiment, the following aspects are provided. A method for using the water-soluble rust inhibitor composition of the present embodiment, comprising applying the water-soluble rust inhibitor composition to a metal part and drying the composition. A method for preventing rust on a metal product, comprising applying the water-soluble rust inhibitor composition of the present embodiment to a metal part and drying it.

[0051] The method for applying the water-soluble rust inhibitor composition to the metal part is not particularly limited, but examples thereof include a method of spraying the composition using a sprayer and a method of immersion. Metals to be protected from rust are preferably metals containing iron, such as pure iron, steel, cast steel, alloy steel, carbon steel, pig iron, and cast iron, but the invention can also be used for other metals. The water-soluble rust inhibitor composition of the present embodiment can be used without particular limitation as long as the application requires rust prevention, and is suitably used not only for rust prevention between processes but also for rust prevention before and after shipment.

[0052] [One aspect of the present invention provided] In one embodiment of the present invention, the following [1] to [7] are provided. [1] A water-soluble rust inhibitor composition comprising at least the following components (A) to (D): Component (A): one or more carboxylic acid compounds selected from the group consisting of branched dicarboxylic acids having 8 to 24 carbon atoms; anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polyvalent carboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic anhydride groups. Component (B): alkylene glycol monohydrocarbyl ether Ingredient (C): Alkanolamine ·Component (D): Water [2] the branched dicarboxylic acid having 8 to 24 carbon atoms is at least one selected from the group consisting of alkylsuccinic acids having 8 to 24 carbon atoms and alkenylsuccinic acids having 8 to 24 carbon atoms; The water-soluble rust inhibitor composition according to the above-mentioned [1], wherein the branched dicarboxylic acid anhydride having 8 to 24 carbon atoms is at least one selected from the group consisting of alkylsuccinic anhydrides having 8 to 24 carbon atoms and alkenylsuccinic anhydrides having 8 to 24 carbon atoms. [3] The water-soluble rust inhibitor composition according to the above [1] or [2], wherein the component (B) is a compound represented by the following general formula (1): [ka] [In the general formula (1), each symbol represents the following.] R 11 represents an alkyl group having 1 to 10 carbon atoms. R 12 represents an alkylene group having 1 to 10 carbon atoms. Each m1 independently represents an integer of 1 to 10. [4] The water-soluble rust inhibitor composition according to any one of the above [1] to [3], wherein the component (C) is a compound represented by the following general formula (2): [ka] [In the general formula (2), each symbol represents the following.] R 21 represents a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms. R 22 represents an alkylene group having 1 to 10 carbon atoms. n1 is an integer from 0 to 2. n2 is an integer from 1 to 3. However, n1+n2=3. [5] The water-soluble rust inhibitor composition according to any one of the above [1] to [4], wherein the ratio of the acid value to the base value [acid value / base number] is 0.05 to 0.97. [6] A method for using the water-soluble rust inhibitor composition according to any one of the above [1] to [5], which comprises applying the water-soluble rust inhibitor composition to a metal part and drying the composition. [7] A method for producing a water-soluble rust inhibitor composition, comprising the step of mixing the following components (A) to (D): Component (A): one or more carboxylic acid compounds selected from the group consisting of branched dicarboxylic acids having 8 to 24 carbon atoms; anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polyvalent carboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic anhydride groups. Component (B): Alkylene glycol monohydrocarbyl ether Ingredient (C): Alkanolamine ·Component (D): Water EXAMPLES

[0053] The present invention will be described in more detail with reference to the following examples, although the present invention is not limited to the following examples.

[0054] [Methods for measuring various physical properties] The measurements of each property were carried out according to the procedures shown below.

[0055] (1) Acid number / base number ratio The acid value / base value ratio of the water-soluble rust inhibitor compositions of the Examples and Comparative Examples was calculated based on the acid value measured by a potentiometric method based on JIS K2501:2003 and the base value measured by a hydrochloric acid method in accordance with JIS K-2501-2003.

[0056] [Examples 1 to 11, Comparative Examples 1 to 7] Water-soluble rust inhibitor compositions having the compositions shown in Tables 1 and 2 were prepared and evaluated as described below. The numerical units for the blend compositions in Table 1 are "mass %." The components used in the preparation of the water-soluble rust inhibitor compositions having the compositions shown in Tables 1 and 2 will be described in detail below.

[0057] <Component (A)> (A)-1: Octylsuccinic anhydride (A)-2: Dodecylsuccinic anhydride (A)-3: Dodecenylsuccinic anhydride (A)-4: Octadecyl succinic acid (A)-5: Mixture containing polycarboxylic acid (carbon number 18 to 36) It is a mixture composed of 20% by mass of trimer acid, 70% by mass of dimer acid, and 10% by mass of monomer acid. (A)-6: Copolymer of α-olefin and maleic anhydride (manufactured by Mitsubishi Chemical Corporation, Diacalna (registered trademark) 30M) (A)-7: Acid-modified ethylene-α-olefin copolymer (manufactured by Mitsui Chemicals, Inc., TAFMER (registered trademark) MH7010) (A)-8: Polycondensation product of ricinoleic acid (degree of polymerization: 3) In addition, (A)-5 is a polycarboxylic acid obtained by polymerizing an unsaturated carboxylic acid having 8 to 24 carbon atoms, (A)-6 and (A)-7 are acid-modified olefin waxes having one or more functional groups selected from the group consisting of a carboxy group and a carboxylic anhydride group, and (A)-8 is a polycarboxylic acid obtained by polymerizing an unsaturated hydroxycarboxylic acid having 8 to 24 carbon atoms. <Component (A')> (A')-1: Decanoic acid (A')-2: Sebacic acid (A')-3: Dodecanedioic acid

[0058] <Ingredient (B)> (B)-1: Diethylene glycol mono-n-hexyl ether (B)-2: Diethylene glycol mono-n-butyl ether

[0059] <Ingredient (C)> (C)-1: N-methylethanolamine (C)-2: Methyldiethanolamine (C)-3: Cyclohexyldiethanolamine

[0060] <Ingredient (D)> Ion-exchanged water

[0061] [evaluation] <Evaluation 1: Rust prevention> The water-soluble rust inhibitor compositions of the examples and comparative examples were diluted 10 times with tap water, and a commercially available SPCC-SD (with the rust inhibitor removed) was immersed in the diluted solution. After removing the SPCC-SD, it was dried at 23°C and then subjected to an exposure test under the eaves. The presence of rust was judged at the time when rust spots appeared. The evaluation criteria were as follows, with A and B being considered as passing. (Evaluation Criteria) A: No rust for over 3 weeks B: Rust occurs within 1 to 3 weeks C: Rust appears in 1 week D: Rust appears in less than a week (Test conditions) Test environment: Corrosion category C2 to C3 equivalent in ISO9225:2012 (Chiba coastal area) Exam season: September

[0062] <Evaluation 2: Amount of adhesion> The water-soluble rust inhibitor compositions of the Examples and Comparative Examples were diluted 10-fold with tap water, and a steel plate (SPCC-SD (rust inhibitor removed)) with a width of 60 mm, length of 80 mm, and thickness of 0.8 mm was immersed in the diluted composition, then removed and dried at 23° C. The adhesion amount (g / m2) was calculated from the difference between the weight of the steel plate before applying the water-soluble rust inhibitor composition and the weight of the steel plate after the oil was removed. 2 The evaluation criteria were as follows, with A and B being considered acceptable. (Evaluation Criteria) A: 0.1g / m 2 less than B: 0.1g / m 2 More than 0.3g / m 2 less than C: 0.3g / m 2 super

[0063] The results of Evaluation 1 and Evaluation 2 are shown in Tables 1 and 2.

[0064] [Table 1]

[0065] [Table 2]

[0066] The following can be seen from Tables 1 and 2: It is clear that the water-soluble rust inhibitor compositions of Examples 1 to 11 have excellent rust prevention properties, have a small amount of adhesion, and are water-soluble rust inhibitor compositions that have excellent rust prevention properties but form thin coatings. In contrast, it is clear that the water-soluble rust inhibitor compositions of Comparative Examples 1 to 7 do not satisfy at least one of the requirements for rust prevention and adhesion amount.

Claims

1. A water-soluble rust inhibitor composition comprising at least the following components (A) to (D): Component (A): one or more carboxylic acid compounds selected from the group consisting of branched dicarboxylic acids having 8 to 24 carbon atoms; anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polycarboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic acid anhydride groups. Component (B): alkylene glycol monohydrocarbyl ether Component (C): Alkanolamine ・Component (D): Water

2. the branched dicarboxylic acid having 8 to 24 carbon atoms is at least one selected from the group consisting of alkylsuccinic acids having 8 to 24 carbon atoms and alkenylsuccinic acids having 8 to 24 carbon atoms; 2. The water-soluble rust inhibitor composition according to claim 1, wherein the branched dicarboxylic acid anhydride having 8 to 24 carbon atoms is at least one selected from the group consisting of alkylsuccinic anhydrides having 8 to 24 carbon atoms and alkenylsuccinic anhydrides having 8 to 24 carbon atoms.

3. 3. The water-soluble rust inhibitor composition according to claim 1, wherein the component (B) is a compound represented by the following general formula (1): 【Chemical 1】 [In the general formula (1), each symbol represents the following.] R １１ represents an alkyl group having 1 to 10 carbon atoms. R １２ represents an alkylene group having 1 to 10 carbon atoms. Each m1 independently represents an integer of 1 to 10.

4. 3. The water-soluble rust inhibitor composition according to claim 1, wherein the component (C) is a compound represented by the following general formula (2): 【Chemistry 2】 [In the general formula (2), each symbol represents the following.] R ２１ represents a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms. R ２２ represents an alkylene group having 1 to 10 carbon atoms. n1 is an integer of 0 to 2. n2 is an integer of 1 to 3. However, n1 + n2 = 3.

5. 3. The water-soluble rust inhibitor composition according to claim 1, wherein the ratio of the acid value to the base value [acid value / base number] is 0.05 to 0.

97.

6. 3. A method for using the water-soluble rust inhibitor composition according to claim 1, which comprises applying the water-soluble rust inhibitor composition to a metal part and drying the composition.

7. A method for producing a water-soluble rust inhibitor composition, comprising the step of mixing the following components (A) to (D): Component (A): one or more carboxylic acid compounds selected from the group consisting of branched dicarboxylic acids having 8 to 24 carbon atoms; anhydrides of branched dicarboxylic acids having 8 to 24 carbon atoms; polycarboxylic acids obtained by polymerizing one or more selected from the group consisting of unsaturated carboxylic acids having 8 to 24 carbon atoms and unsaturated hydroxycarboxylic acids having 8 to 24 carbon atoms; and acid-modified olefin waxes having one or more functional groups selected from the group consisting of carboxy groups and carboxylic acid anhydride groups. Component (B): alkylene glycol monohydrocarbyl ether Component (C): Alkanolamine ・Component (D): Water

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