Water-soluble composition

Abstract

This water-soluble composition is obtained by blending at least components (A)-(E). · Component (A): Ricinoleic acid condensate · Component (B): Film-forming assistant · Component (C): Non-condensed carboxylic acid · Component (D): Amine-based compound · Component (E): Water

Description

water soluble composition

[0001] This invention relates to a water-soluble composition.

[0002] Metal materials such as steel plates are processed through multiple processes to become intermediate products and final molded products, and rust inhibitors are usually applied to prevent oxidative deterioration of the metal surface. From the viewpoint of rust prevention, oil-based rust inhibitors have been conventionally used, and various oil-based rust inhibitors have been proposed (see, for example, Patent Document 1). In recent years, water-soluble rust inhibitors have also been used from the viewpoints of (1) improving the working environment by suppressing stickiness caused by oil, (2) suppressing stickiness on the metal surface caused by the rust inhibitor film (hereinafter also called "rust-preventive film") by making the rust inhibitor film after drying thinner, (3) making it easy to remove the rust-preventive film in subsequent processes (it can be washed off with water) or from the viewpoint that the rust-preventive film can be used directly in the next process without removal in subsequent processes, thus reducing the degreasing process, and (4) being economical because it can be used after dilution with water (see, for example, Patent Document 2).

[0003] Japanese Patent Application Publication No. 2018-76565 Publication No. 9-3667

[0004] Currently, water-soluble rust inhibitors have low rust-preventive properties and are limited to use in inter-process rust prevention. Therefore, from the perspective of enabling use in applications other than inter-process rust prevention, the creation of water-soluble compositions with enhanced rust-preventive properties is desired. Furthermore, from the perspective of enhancing rust-preventive properties, it is important to uniformly form a rust-preventive film over the entire metal surface, and for this purpose, it is desirable that the water-soluble composition has excellent wetting and spreading properties (hereinafter sometimes simply referred to as "wetting and spreading properties") on the metal surface. However, to date, the creation of a water-soluble composition that satisfies these requirements has not yet been achieved.

[0005] Therefore, the object of the present invention is to provide a water-soluble composition that is excellent in rust prevention as well as excellent in wetting spread.

[0006] The present invention provides the following [1] to [4]: ​​[1] A water-soluble composition comprising at least the following components (A) to (E): Component (A): ricinoleic acid condensate Component (B): film-forming aid Component (C): non-condensing carboxylic acid Component (D): amine compound Component (E): water [2] A method for using the water-soluble composition described in [1] above for rust prevention of metal parts. [3] A method for rust prevention of metal parts comprising applying the water-soluble composition described in [1] above to metal parts and drying it. [4] A method for producing a water-soluble composition, comprising the step of mixing the following components (A) to (E): Component (A): ricinoleic acid condensate Component (B): film-forming aid Component (C): non-condensing carboxylic acid Component (D): amine compound Component (E): water

[0007] According to the present invention, it is possible to provide a water-soluble composition that has excellent rust prevention properties while also having excellent wetting spread properties.

[0008] The upper and lower limits of the numerical ranges described herein can be combined in any way. For example, if the numerical ranges "A to B" and "C to D" are described, the numerical ranges "A to D" and "C to B" are also included within the scope of the present invention. Furthermore, unless otherwise specified, the numerical ranges "lower limit to upper limit" described herein mean greater than or equal to the lower limit and less than or equal to the upper limit.

[0009] [Aspects of the water-soluble composition] The water-soluble composition of this embodiment comprises at least the following components (A) to (E): Component (A): Ricinoleic acid condensate Component (B): Film-forming aid Component (C): Non-condensed carboxylic acid Component (D): Amine compound Component (E): Water

[0010] The inventors conducted various studies to solve the above problems. However, it was found that substrates with excellent wetting properties tend to contain many hydrophilic groups and therefore tend to easily absorb water. As a result, rust-preventive coatings containing substrates with excellent wetting properties are easily damaged by absorbing water due to condensation, etc., and as a result, sufficient rust prevention cannot be ensured. Therefore, it was difficult to create a water-soluble composition that is excellent in both rust prevention and wetting properties. Under these circumstances, the inventors continued their diligent studies and found that a water-soluble composition containing components (A) to (E) is excellent in both rust prevention and wetting properties, thus completing the present invention.

[0011] In this embodiment, the water-soluble composition defined as "a water-soluble composition comprising at least components (A) to (E)" includes the following embodiments: • "A water-soluble composition containing at least components (A) to (E)" • "A water-soluble composition containing a modified product obtained by modifying one or more components selected from components (A) to (D), and also containing component (E)" and / or • "A water-soluble composition containing not only components (A) to (D), but also reaction products obtained by the reaction of two or more components selected from components (A) to (D), and also containing component (E)" The water-soluble composition of this embodiment may contain components other than components (A) to (E) (hereinafter also referred to as "other components") to the extent that it does not impair the effects of the present invention. Each component contained in the water-soluble composition of this embodiment will be described in detail below.

[0012] <Component (A): Ricinoleic Acid Condensate> The water-soluble composition of this embodiment is formulated with a ricinoleic acid condensate as component (A). By incorporating component (A) into the water-soluble composition of this embodiment, the water-soluble composition has excellent wettability and spreadability, making it easier to form a uniform rust-preventive film over the entire metal surface. A ricinoleic acid condensate is a compound having a condensed ricinoleic acid skeleton obtained by esterifying two or more ricinoleic acid molecules. Component (A) may be used alone or in combination of two or more types.

[0013] Here, the average degree of polymerization of component (A) is preferably high from the viewpoint of improving rust prevention. Specifically, it is preferably 2 or higher, more preferably 2.5 or higher, even more preferably 3.0 or higher, and even more preferably 3.3 or higher. Furthermore, the average degree of polymerization of component (A) is preferably 6.0 or lower, more preferably 5.8 or lower, from the viewpoint of the solubility of component (A) in water-soluble compositions and the viewpoint of improving the effects of the present invention.

[0014] Furthermore, the terminal structure of component (A) is not particularly limited and may be, for example, a terminal structure derived from ricinoleic acid, or it may have a terminal structure derived from a fatty acid other than ricinoleic acid. From the viewpoint of improving rust prevention, it is preferable that the terminal structure derived from a fatty acid having 12 to 30 carbon atoms does not have hydrophilic groups such as hydroxyl groups, more preferably it is a terminal structure derived from a fatty acid having 16 to 20 carbon atoms that does not have hydrophilic groups such as hydroxyl groups, and even more preferably it is a terminal structure derived from oleic acid. Preferred embodiments of the terminal structure of component (A) include one or more selected from the terminal structures derived from ricinoleic acid and the terminal structures derived from oleic acid.

[0015] <Component (B): Film-forming aid> The water-soluble composition of this embodiment is formulated with a film-forming aid as component (B). By incorporating component (B), the water-soluble composition of this embodiment can form a good rust-preventive film and effectively suppress the reach of water, such as condensation, which can cause corrosion after film formation, to the metal surface. Component (B) may be used alone or in combination of two or more types.

[0016] In this embodiment, the film-forming aid is not particularly limited as long as it can improve the film-forming properties of the rust-preventive film. However, from the viewpoint of forming a good rust-preventive film while increasing the hydrophobicity of the rust-preventive film and more effectively suppressing the reach of water to the metal surface, the film-forming aid is preferably one or more selected from the group consisting of lignin, lignin sulfonic acid, polyvinylpyrrolidone, gum arabic, zein, xylan, styrene maleic anhydride polymer, and glycol ether compounds having an organic content of 100 or more and an inorganic content of 60 to 160 in the organic conceptual diagram.

[0017] (Lignin) Lignin is a major component of plant cell walls, along with polysaccharides such as cellulose. In this embodiment, various types of lignin extracted from plant raw materials such as wood by conventional methods such as steam explosion can be used without particular limitation.

[0018] (Lignosulfonic acid) As for ligninsulfonic acid, for example, those obtained using waste liquid eluted from sulfurous acid pulp in a chemical pulping method by sulfurous acid pulping can be used without particular limitation. Specifically, as for ligninsulfonic acid, one or more selected from calcium ligninsulfonate, sodium ligninsulfonate, potassium ligninsulfonate, and magnesium ligninsulfonate can be used. Among these, sodium ligninsulfonate is preferred from the viewpoint of availability and other factors.

[0019] (Polyvinylpyrrolidone) Polyvinylpyrrolidone is a polymer compound obtained by polymerizing N-vinyl-2-pyrrolidone. In this embodiment, from the viewpoint of improving rust prevention, the average molecular weight of polyvinylpyrrolidone is preferably 500 to 100,000, more preferably 1,000 to 50,000, and even more preferably 2,000 to 40,000.

[0020] (Gum Arabic) Gum arabic is a dried secretion from the bark of the Acacia senegal tree (Acacia senegal), a member of the Mimograceae family. It can be used in various forms, such as powder, without any particular restrictions.

[0021] (Zein) Zein is a water-insoluble protein derived from corn, and can be used in various forms such as powder without any particular restrictions.

[0022] (Xylan) Xylan is a plant-derived (bio-derived) high-molecular-weight compound, a heterosaccharide in which various side chains are attached to a β(1,4)-linked xylose main chain. The types of substituents attached to the side chains are not particularly limited, but examples include one or more selected from the group consisting of glucuronic acid, galactose, mannose, glucose, arabinose, and fucose.

[0023] (Styrene maleic anhydride polymer) Styrene maleic anhydride polymer is a copolymer of styrene and maleic anhydride. The copolymer may be a random copolymer or a block copolymer, but a random copolymer is preferred from the viewpoint of availability and other factors. In this embodiment, from the viewpoint of improving rust prevention, the average molecular weight of the styrene maleic anhydride polymer is preferably 200 to 100,000, more preferably 500 to 50,000, and even more preferably 800 to 10,000.

[0024] (Glycol ether compound) The glycol ether compound used as component (B) in this embodiment is a glycol ether compound having an organic component of 100 or more and an inorganic component of 60 to 160 in the organic conceptual diagram.

[0025] Here, we will explain the organic conceptual diagram. The organic conceptual diagram is described in works such as "Organic Conceptual Diagram - Fundamentals and Applications -" (by Yoshio Koda, Sankyo Publishing, 1984). In other words, the "organic conceptual diagram" quantifies two factors for all organic compounds according to a prescribed rule: "organicness" resulting from the covalent bond chain in the carbon region and "inorganicness" due to the electrostatic effect present in substituents (functional groups). These two factors are then plotted on a diagram with the organicness value on the X axis and the inorganicness value on the Y axis. The above-mentioned literature states that the magnitude of the organicness value in the organic conceptual diagram can be measured by the number of carbon atoms, represented by the methylene group, in the molecule of the organic compound. Furthermore, it is stipulated that "the basic organicness value for one carbon atom is set to 20, which is the average value of the boiling point elevation due to the addition of one carbon atom for organic compounds with around 5 to 10 carbon atoms."

[0026] A glycol ether compound having an organicity of 100 or more and an inorganicity of 60 to 160 in an organic conceptual diagram can impart excellent rust inhibition properties to a water-soluble composition. Here, from the viewpoints of rust inhibition properties and storage stability, the organicity is preferably 120 to 300, more preferably 150 to 280, still more preferably 150 to 250. Further, from the viewpoints of imparting wettability and spreading properties and storage stability, the inorganicity is preferably 80 to 150, more preferably 110 to 150, still more preferably 130 to 150.

[0027] The glycol ether compound as component (B) is not particularly limited as long as the organicity and inorganicity thereof in the organic conceptual diagram satisfy the above ranges, and preferably includes alkylene glycol monoalkyl ethers represented by the following general formula (1).

[0028]

[0029] In the above general formula (1), R １ represents an alkyl group having 4 or more carbon atoms. R ２ represents an alkylene group having 2 or 3 carbon atoms. m1 is an integer of 1 to 5.

[0030] R １ The number of carbon atoms of the alkyl group that can be selected as is preferably 4 to 12, more preferably 4 to 10, still more preferably 4 to 8, even more preferably 6 to 8.

[0031] R １ The alkyl group that can be selected as may be a linear alkyl group or a branched alkyl group. R １ Specific examples of the alkyl group that can be selected as include n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, 2-ethylhexyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, etc. Among these, n-butyl group, isobutyl group, n-hexyl group, or 2-ethylhexyl group are preferable, and n-butyl group, n-hexyl group, and 2-ethylhexyl group are more preferable.

[0032] R２ From the viewpoint of the availability of alkylene glycol monoalkyl ethers, it is preferably an alkylene group having 2 carbon atoms.

[0033] m1 is preferably 1 to 4, more preferably 1 to 3, even more preferably 1 to 2, and even more preferably 1, from the viewpoint of ensuring appropriate inorganic properties and the availability of alkylene glycol monoalkyl ethers.

[0034] In this embodiment, preferred compounds as alkylene glycol monoalkyl ethers include n-butyl carbitol, n-hexyl carbitol, and 2-ethylhexyl carbitol, among which n-hexyl carbitol and 2-ethylhexyl carbitol are more preferred, and 2-ethylhexyl carbitol is even more preferred.

[0035] (Preferred form of film-forming aid) In the water-soluble composition of this embodiment, preferred film-forming aids from the viewpoint of improving the effects of the present invention (particularly from the viewpoint of improving wettability) are one or more selected from the group consisting of lignin, sodium ligninsulfonate, polyvinylpyrrolidone, gum arabic, zein, styrene maleic anhydride polymer, and glycol ether compounds having an organic content of 100 or more and an inorganic content of 60 to 160 in the organic conceptual diagram. More preferred film-forming aids are lignin, sodium ligninsulfonate, polyvinylpyrrolidone, styrene maleic anhydride polymer, and organic in the organic conceptual diagram. The film-forming aid is one or more selected from the group consisting of glycol ether compounds having an inorganic property of 100 or more and an inorganic property of 60 to 160. A more preferred film-forming aid is one or more selected from the group consisting of lignin, sodium lignin sulfonate, polyvinylpyrrolidone, styrene maleic anhydride polymer, n-hexyl carbitol, and 2-ethylhexyl carbitol. A more preferable film-forming aid is one or more selected from the group consisting of n-hexyl carbitol and 2-ethylhexyl carbitol, and even more preferably 2-ethylhexyl carbitol.

[0036] <Component (C): Non-condensed carboxylic acid> The water-soluble composition of this embodiment is formulated with a non-condensed carboxylic acid as component (C). It is presumed that by incorporating component (C) into the water-soluble composition of this embodiment, the density of the rust-preventive film formed by the water-soluble composition is improved, and excellent rust prevention properties can be exhibited. Component (C) may be used alone or in combination of two or more types. In this specification, "non-condensed carboxylic acid" means a carboxylic acid that does not have a condensed carboxylic acid skeleton obtained by esterifying two or more carboxylic acid molecules.

[0037] In this embodiment, as the non-condensed carboxylic acid, from the viewpoint of improving rust prevention, a non-condensed carboxylic acid having 8 to 24 carbon atoms is preferred, and more preferably, one or more selected from the group consisting of non-condensed fatty acids having 8 to 24 carbon atoms and non-condensed dibasic acids having 8 to 24 carbon atoms is preferred.

[0038] (Non-condensed fatty acids with 8 to 24 carbon atoms) Non-condensed fatty acids with 8 to 24 carbon atoms may be linear or branched, and may be saturated or unsaturated. Examples of linear and branched non-condensed saturated fatty acids include various octanoic acids such as n-octanoic acid, 2-ethylhexanoic acid, and isooctanoic acid; various nonanoic acids such as n-nonanoic acid, 3,5,5-trimethylhexanoic acid, and isononanoic acid; various decanoic acids such as n-decanoic acid, isodecanoic acid, 3,7-dimethyloctanoic acid, and neodecanoic acid; various undecanoic acids; various dodecanoic acids; various tetradecanoic acids; various hexadecanoic acids; various octadecanoic acids (including stearic acid and isostearic acid); various eicosanoic acids; various henicosanoic acids; various tricosanoic acids; and various tetracosanoic acids. Furthermore, examples of non-condensed unsaturated fatty acids include various octenylic acids, various nonenylic acids, various decenylic acids, various hexadecenylic acids, various octadecenylic acids (including oleic acid and / or linoleic acid (its isomerized linoleic acid)), various eicocenylic acids, various henicocenylic acids, various tricocenylic acids, and various tetracocenylic acids. Among these, from the viewpoint of improving rust prevention and ease of availability, fatty acids having 8 to 18 carbon atoms are preferred, with n-nonanoic acid, neodecanoic acid, and linoleic acid and its isomer (isomerized linoleic acid) being more preferred. It is also preferable to use these in combination. Preferred combinations include n-nonanoic acid and neodecanoic acid, neodecanoic acid and linoleic acid, or neodecanoic acid and isomerized linoleic acid. Among these, the combination of n-nonanoic acid and neodecanoic acid, or neodecanoic acid and isomerized linoleic acid are more preferred.

[0039] (Non-condensed dibasic acids with 8 to 24 carbon atoms) Non-condensed dibasic acids with 8 to 24 carbon atoms may be linear or branched, and may be saturated or unsaturated. Examples of linear and branched non-condensed saturated dibasic acids include various octanedioic acids such as suberic acid, various nonanedioic acids such as azelaic acid, various decanedioic acids such as n-decanedioic acid, various undecanedioic acids such as n-undecanedioic acid, various dodecanedioic acids such as n-dodecanedioic acid, various tridecanedioic acids, various tetradecanedioic acids, various pentadecanedioic acids, various hexadecanedioic acids, various heptadecanedioic acids, various octadecanedioic acids, various eicosanedioic acids, and various docosanedioic acids. Furthermore, examples of non-condensing unsaturated dibasic acids include decendioic acid, undecendioic acid, dodecendioic acid, tetradecendioic acid, hexadecenoic acid, and octadecendioic acid. Among these, non-condensing saturated dibasic acids having 8 to 18 carbon atoms are preferred from the viewpoint of improved rust prevention and ease of availability, with n-decanediic acid and n-dodecanediic acid being more preferred.

[0040] <Component (D): Amine Compound> The water-soluble composition of this embodiment is formulated with an amine compound as component (D). By incorporating component (D) into the water-soluble composition of this embodiment, components (A) and (C) in the water-soluble composition can be made into amine salts, and the solubility of the amine salts in the water-soluble composition can be improved. This makes it easier to form a uniform rust-preventive film over the entire metal surface. Furthermore, it is possible to improve the stability of the rust-preventive film and make it easier to exhibit rust prevention properties over a long period of time. Component (D) may be used alone or in combination of two or more types.

[0041] In this embodiment, the amine compound can be any amine compound used in water-soluble compositions such as water-soluble rust inhibitor compositions.

[0042] In this embodiment, from the viewpoint of further improving the stability of the rust-preventive coating and making it easier to exhibit rust prevention over a longer period of time, it is preferable to contain two or more amine compounds (hereinafter sometimes referred to as "low-volatile amines") whose volatility, calculated from the following formula (i) when heated at 50°C for 48 hours, is 20% or less. Formula (i): Volatility (%) = ([Mass of amine compound before heating] - [Mass of amine compound after heating for 48 hours]) / [Mass of amine compound before heating] × 100 In this specification, volatility means the value measured based on the method described in the examples below.

[0043] The low-volatility amine may be, for example, a monoamine having one amino nitrogen atom per molecule, a diamine having two amino nitrogen atoms per molecule, or a polyamine having three or more amino nitrogen atoms per molecule. However, from the viewpoint of keeping the volatility below a predetermined value, a monoamine is preferred as the low-volatility amine.

[0044] The monoamine used as a low-volatility amine may be a primary amine, a secondary amine, or a tertiary amine. However, from the viewpoint of keeping the volatility below a predetermined value, a primary amine compound represented by the following general formula (d-1) is preferred as the primary amine, a secondary amine compound represented by the following general formula (d-2) is preferred as the secondary amine, and a tertiary amine compound represented by the following general formula (d-3) is preferred as the tertiary amine.

[0045]

[0046] In the general formula (d-1) above, p1 and p2 are each an integer between 0 and 10, preferably between 1 and 6, more preferably between 1 and 4, even more preferably between 2 and 3, and even more preferably 2. x1 is 0 or 1.

[0047] As the primary amine compound represented by the general formula (d-1), 2-(2-aminoethoxy)ethanol is preferred.

[0048] In the general formula (d-2), R １１ ~R １４are each independently a hydrogen atom, a hydroxyl group, a linear or branched alkyl group optionally substituted with a hydroxyl group, or a phenyl group. R １１ to R １４ , the number of carbon atoms in the alkyl group that can be selected is preferably 1 to 12, more preferably 1 to 10, still more preferably 1 to 6, even more preferably 1 to 3. Provided that R １１ and R １３ preferably has at least one being a hydrogen atom and the other being a group other than a hydrogen atom; further, R １２ and R １４ preferably has at least one being a hydrogen atom and the other being a group other than a hydrogen atom. X １ and X ２ are each independently an oxygen atom, an oxyethylene group, or an oxypropylene group. p3 and p4 are each independently an integer of 0 to 10, preferably an integer of 0 to 6, and more preferably an integer of 0 to 3.

[0049] As the secondary amine compound represented by the general formula (d-2), diisopropanolamine or dibenzylamine is preferable.

[0050] In the general formula (d-3), R ２１ to R ２４ are each independently a hydrogen atom, a hydroxyl group, a linear or branched alkyl group optionally substituted with a hydroxyl group, or a phenyl group. R ２１ to R ２４ , the number of carbon atoms in the alkyl group that can be selected is preferably 1 to 12, more preferably 1 to 10, still more preferably 1 to 6, even more preferably 1 to 3. Provided that R ２１ and R ２３ preferably has at least one being a hydrogen atom and the other being a group other than a hydrogen atom; further, R ２２ and R ２４ preferably has at least one being a hydrogen atom and the other being a group other than a hydrogen atom. X ３ and X ４Each of these is independently an oxygen atom, an oxyethylene group, or an oxypropylene group. Each of p3 and p4 is independently an integer from 0 to 10, preferably an integer from 0 to 6, and more preferably an integer from 0 to 3. ３１ R is a linear or branched alkyl group, phenyl group, or cyclohexyl group, which may be substituted with a hydroxyl group. ３１ The number of carbon atoms in the alkyl group that can be selected is preferably 1 to 12, more preferably 1 to 10, even more preferably 1 to 6, and even more preferably 1 to 3.

[0051] The tertiary amine compound represented by the general formula (d-3) is preferably N-methyldiethanolamine, triethanolamine, triisopropanolamine, cyclohexyldiethanolamine, or polyoxyalkylene alkylamine, and more preferably contains N-methyldiethanolamine or cyclohexyldiethanolamine.

[0052] In the above general formulas (d-2) to (d-3), R １１ ~R １４ , R ２１ ~R ２４ and R ３１ Examples of alkyl groups that can be selected include methyl group, ethyl group, propyl group (n-propyl group, i-propyl group), butyl group (n-butyl group, i-butyl group, s-butyl group, t-butyl group), pentyl group (n-pentyl group, i-pentyl group, neopentyl group), hexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, undecyl group, dodecyl group, and the like. The alkyl group may be a linear alkyl group or a branched alkyl group.

[0053] In this embodiment, the low-volatility amine consists of a combination of two or more types, specifically the following combinations: • (i) A combination of at least one primary amine and at least one secondary amine. • (ii) A combination of at least one primary amine and at least one tertiary amine. • (iii) A combination of at least one secondary amine and at least one tertiary amine. • (iv) A combination of at least one primary amine, at least one secondary amine, and at least one tertiary amine. • (v) A combination of at least two primary amines. • (vi) A combination of at least two secondary amines. • (vii) A combination of at least two tertiary amines. Among the above combinations, (vii) is preferred from the viewpoint of further improving the stability of the rust-preventive coating and making it easier to exhibit rust prevention properties over a longer period. Furthermore, as the combination of (vii) above, N-methyldiethanolamine and cyclohexyldiethanolamine are preferred.

[0054] Furthermore, in this embodiment, component (D) may also contain an amine compound that is not a low-volatility amine in addition to a low-volatility amine. Examples of amine compounds that are not low-volatility amines include amine compounds used in water-soluble compositions and amine compounds used in water-soluble metalworking oil compositions that are not low-volatility amines. Examples of such amine compounds include amine compounds having an alicyclic group with 5 to 12 (preferably 6) ring-forming carbon atoms. Examples of such amine compounds include dicyclohexylamine or N-methyldicyclohexylamine, with N-methyldicyclohexylamine being preferred.

[0055] <A / (A+B+C+D)> In the water-soluble composition of this embodiment, the amount of component (A) [A / (A+B+C+D)] relative to the total amount of component (A), component (B), component (C), and component (D) is preferably 0.05 to 0.50, more preferably 0.10 to 0.40, and even more preferably 0.10 to 0.35 by mass ratio, from the viewpoint of easily improving both rust prevention and wettability.

[0056] <B / (A+B+C+D)> In the water-soluble composition of this embodiment, the amount of component (B) [B / (A+B+C+D)] relative to the total amount of component (A), component (B), component (C), and component (D) is preferably 0.01 to 0.40, more preferably 0.03 to 0.35, even more preferably 0.05 to 0.30, and even more preferably 0.05 to 0.20 by mass ratio, from the viewpoint of easily improving both rust prevention and wettability.

[0057] <C / (A+B+C+D)> In the water-soluble composition of this embodiment, the amount of component (C) [C / (A+B+C+D)] relative to the total amount of component (A), component (B), component (C), and component (D) is preferably 0.01 to 0.40, more preferably 0.05 to 0.30, and even more preferably 0.05 to 0.20 by mass ratio.

[0058] <D / (A+B+C+D)> In the water-soluble composition of this embodiment, the amount of component (D) [D / (A+B+C+D)] relative to the total amount of component (A), component (B), component (C), and component (D) is preferably 0.20 to 0.60, more preferably 0.30 to 0.50, and even more preferably 0.35 to 0.50, in terms of mass ratio, from the viewpoint of easily improving both rust prevention and wettability.

[0059] <A / B> In the water-soluble composition of this embodiment, the amount of component (A) to the amount of component (B) [A / B] is preferably 1.00 to 6.00, more preferably 1.20 to 5.80, even more preferably 1.50 to 5.00, and even more preferably 2.00 to 4.50 in mass ratio.

[0060] <A / C> In the water-soluble composition of this embodiment, the amount of component (A) to the amount of component (C) [A / C] is preferably 1.00 to 6.00, more preferably 1.30 to 5.50, even more preferably 1.50 to 5.00, and even more preferably 1.50 to 4.00, in terms of mass ratio, from the viewpoint of easily improving both rust prevention and wettability.

[0061] <A / D> In the water-soluble composition of this embodiment, the amount of component (A) to the amount of component (D) [A / D] is preferably 0.10 to 3.00, more preferably 0.20 to 2.00, and even more preferably 0.30 to 1.50 by mass ratio, from the viewpoint of easily improving both rust prevention and wettability.

[0062] <B / C> In the water-soluble composition of this embodiment, the amount of component (B) to the amount of component (C) [B / C] is preferably 0.10 to 2.00, more preferably 0.20 to 1.50, even more preferably 0.25 to 1.30, and even more preferably 0.30 to 1.20 in mass ratio, from the viewpoint of easily improving both rust prevention and wettability.

[0063] <B / D> In the water-soluble composition of this embodiment, the amount of component (B) to the amount of component (D) [B / D] is preferably 0.01 to 0.50, more preferably 0.05 to 0.45, and even more preferably 0.10 to 0.40 by mass ratio, from the viewpoint of easily improving both rust prevention and wettability.

[0064] <C / D> In the water-soluble composition of this embodiment, the ratio of component (C) to the amount of component (D) [C / D] is preferably 0.05 to 0.50, more preferably 0.08 to 0.45, even more preferably 0.10 to 0.40, and even more preferably 0.15 to 0.35 by mass, from the viewpoint of easily improving both rust prevention and wettability.

[0065] <Preferred ranges for each component in the water-soluble composition> In the water-soluble composition of this embodiment, the amount of each component (A) to (D) is preferably within the following ranges, relative to 100 parts by mass of the total amount of components (A) to (D): Component (A): 5 to 50 parts by mass Component (B): 1 to 40 parts by mass Component (C): 1 to 40 parts by mass Component (D): 20 to 60 parts by mass A more preferred amount of each component (A) to (D) relative to 100 parts by mass of the total amount of components (A) to (D) is within the following ranges: Component (A): 10 to 40 parts by mass Component (B): 2 to 30 parts by mass (preferably 5 to 30 parts by mass) Component (C): 5 to 30 parts by mass Component (D): 30 to 50 parts by mass A still more preferred amount of each component (A) to (D) relative to 100 parts by mass of the total amount of components (A) to (D) is within the following ranges. • Component (A): 10 to 35 parts by mass • Component (B): 2 to 30 parts by mass (preferably 5 to 20 parts by mass) • Component (C): 5 to 20 parts by mass • Component (D): 35 to 50 parts by mass

[0066] <Component (E): Water> The water, which is component (E), is not particularly limited and can be purified water such as distilled water or ion-exchanged water (deionized water); tap water; industrial water; etc., and is preferably purified water, and more preferably ion-exchanged water (deionized water).

[0067] Here, the amount of component (E) is distinguished according to the form of the water-soluble composition. Water-soluble compositions are generally used by the user after diluting the stock solution with water. Therefore, the amount of component (E) is as follows, depending on the form of the water-soluble composition. The following amounts are particularly suitable, for example, when the water-soluble composition is used as a rust inhibitor (water-soluble rust inhibitor composition).

[0068] (1) When the water-soluble composition is in its undiluted form, the water-soluble composition is diluted with water before use. In this case, the amount of component (E) to be added is 1 to 100 parts by mass per 100 parts by mass of the total amount of components (A) to (D). (2) When the water-soluble composition is diluted with water, the water-soluble composition is diluted with water (in the case of a diluted solution), and the diluted solution is applied to a metal surface to form a film. In this case, the amount of component (E) to be added is preferably 100 to 5,000 parts by mass, more preferably 100 to 3,000 parts by mass, even more preferably 100 to 2,000 parts by mass, and even more preferably 100 to 1,500 parts by mass per 100 parts by mass of the total amount of components (A) to (D). However, the amount of component (E) in (2) also includes the amount of water used for dilution. Furthermore, the lower limit of the amount of component (E) may be more than 100 parts by mass relative to 100 parts by mass of the total amount of components (A) to (D).

[0069] <Other Components> The water-soluble composition of this embodiment may further contain other components besides components (A) to (E), as long as they do not impair the effects of the present invention. Examples of other components include antioxidants, defoaming agents, aluminum discoloration inhibitors, copper deactivators, etc. One of the other components may be used alone, or two or more may be used in combination. The amount of each other component is adjusted as appropriate, as long as it 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, per 100 parts by mass of the total amount of components (A) to (E).

[0070] Herein, from the viewpoint of improving the effects of the present invention, the total amount of components (A) to (E) in the water-soluble composition of this embodiment is preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, and even more preferably 90% by mass or more, based on the total amount of the water-soluble composition.

[0071] Furthermore, in the water-soluble composition of this embodiment, from the viewpoint of improving the effects of the present invention, it is preferable that the amount of mineral oil is small. Specifically, the amount of mineral oil is preferably less than 10 parts by mass, more preferably less than 1 part by mass, even more preferably less than 0.1 parts by mass, and even more preferably no mineral oil is included, based on 100 parts by mass of the total amount of components (A) to (E). Furthermore, in the water-soluble composition of this embodiment, from the viewpoint of improving the effects of the present invention, it is preferable that the amount of polyoxyalkylene alkyl ether is small. The polyoxyalkylene alkyl ether referred to here is a compound that does not fall under the glycol ether compounds in the organic conceptual diagram that have an organic content of 100 or more and an inorganic content of 60 to 160. Specifically, the amount of polyoxyalkylene alkyl ether that does not fall under the glycol ether compounds in the organic conceptual diagram that have an organic content of 100 or more and an inorganic content of 60 to 160 is preferably less than 3 parts by mass, more preferably less than 1 part by mass, even more preferably less than 0.1 parts by mass, and even more preferably no polyoxyalkylene alkyl ether is included, based on 100 parts by mass of the total amount of components (A) to (E).

[0072] [Physical properties of the water-soluble composition] The water-soluble composition of this embodiment preferably satisfies the following physical properties.

[0073] <Rust Prevention> The water-soluble composition of this embodiment provides rust prevention for a period of three weeks or more, more preferably four weeks or more, according to the method described in the examples below.

[0074] <Wetting Spreadability> The water-soluble composition of this embodiment only needs to have a wetting spreadability (liquid area) of 60% or more, preferably 70% or more, more preferably 80% or more, even more preferably 90% or more, and even more preferably 100%.

[0075] [Method for Producing the Water-Soluble Composition] The method for producing the water-soluble composition of this embodiment is not particularly limited. For example, the method for producing the water-soluble composition of this embodiment includes the step of mixing the following components (A) to (E): Component (A): Ricinoleic acid condensate Component (B): Film-forming aid Component (C): Non-condensed carboxylic acid Component (D): Amine compound Component (E): Water

[0076] The order in which components (A) to (E) are added is not particularly limited, but it is preferable to add components (A) and (B) simultaneously or separately to the mixture obtained by mixing components (C) and (D). In addition to components (A) to (E), other components may also be added. The preferred embodiments of each of the above components are as previously described.

[0077] [Uses of the Water-Soluble Composition] The water-soluble composition of this embodiment has excellent rust prevention properties and wetting spread properties. Therefore, when the water-soluble composition of this embodiment is applied to a metal surface, it is diluted with water in the case of "(1) when the water-soluble composition is in its undiluted form" or applied as is in the case of "(2) when the water-soluble composition has been diluted with water", thereby forming a thin film on the surface of the metal material and exhibiting excellent rust prevention properties. Accordingly, the water-soluble composition of this embodiment can be used as a rust inhibitor (water-soluble rust inhibitor composition). Accordingly, the following aspects are provided according to this embodiment: - A method of using the water-soluble composition of this embodiment for rust prevention of metal parts. - A method of rust prevention of metal parts by applying the water-soluble composition of this embodiment to metal parts and drying it.

[0078] The method of applying the water-soluble composition to metal parts is not particularly limited, but methods such as spraying or immersion are possible. The metals to be rust-prevented are preferably iron-containing metals such as pure iron, steel, cast steel, alloy steel, carbon steel, pig iron, and cast iron, but it can also be used on other metals. The water-soluble composition of this embodiment can be used without particular limitations for any application requiring rust prevention, and is suitably used not only for rust prevention between processes but also for rust prevention before and after shipment. Furthermore, the water-soluble composition of this embodiment can be used not only for rust prevention but also, for example, as a coolant (water-soluble coolant composition). Specifically, it can be used, for example, as a coolant for cooling metal workpieces after tempering.

[0079] [One aspect of the present invention provided] According to one aspect of the present invention, the following [1] to

[12] are provided. [1] A water-soluble composition comprising at least the following components (A) to (E): Component (A): Ricinoleic acid condensate Component (B): Film-forming aid Component (C): Non-condensing carboxylic acid Component (D): Amine compound Component (E): Water [2] The water-soluble composition according to [1], wherein component (B) is one or more selected from the group consisting of lignin, lignin sulfonic acid, polyvinylpyrrolidone, gum arabic, zein, xylan, styrene maleic anhydride polymer, and glycol ether compounds having an organic content of 100 or more and an inorganic content of 60 to 160 in the organic conceptual diagram. [3] The water-soluble composition according to [1] or [2], wherein the average degree of polymerization of component (A) is 2 or more. [4] The water-soluble composition according to any one of [1] to [3] above, wherein component (A) has one or more terminal structures selected from ricinoleic acid-derived terminal structures and oleic acid-derived terminal structures. [5] The water-soluble composition according to any one of [1] to [4] above, wherein component (C) has 8 to 24 carbon atoms. [6] The water-soluble composition according to any one of [1] to [5] above, wherein component (D) contains two or more amine compounds whose volatility, calculated from the following formula (i) when heated at 50°C for 48 hours, is 20% or less. Formula (i): Volatility (%) = ([Mass of amine compound before heating] - [Mass of amine compound after heating for 48 hours]) / [Mass of amine compound before heating] × 100 [7] The water-soluble composition according to any one of [1] to [6] above, wherein the total amount of components (A) to (E) is 40% by mass or more on a total basis of the water-soluble composition. [8] A water-soluble composition according to any one of [1] to [7] above, wherein the amount of each of the components (A) to (D) is within the following ranges per 100 parts by mass of the total amount of components (A) to (D): - Component (A): 5 to 50 parts by mass - Component (B): 1 to 40 parts by mass - Component (C): 1 to 40 parts by mass - Component (D): 20 to 60 parts by mass [9] A water-soluble composition according to any one of [1] to [8] above, used as a rust inhibitor.

[10] A method of using the water-soluble composition according to any one of [1] to [9] above for rust prevention of metal parts.

[11] A method for preventing rust on metal parts, comprising applying a water-soluble composition described in any one of [1] to [9] above to a metal part and drying it.

[12] A method for producing a water-soluble composition, comprising the step of mixing the following components (A) to (E): Component (A): Ricinoleic acid condensate; Component (B): Film-forming aid; Component (C): Non-condensing carboxylic acid; Component (D): Amine compound; Component (E): Water.

[0080] The present invention will be specifically described by the following examples, but the present invention is not limited to the following examples.

[0081] [Measurement Methods for Various Physical Properties] The measurement of each property was carried out according to the following procedure.

[0082] (1) Volatility of Amine Compounds 20 g of the amine compound to be measured was weighed using an electronic balance into a 70 mm diameter glass petri dish (manufactured by Kenis Corporation), and placed without a lid in a precision constant temperature oven with an explosion vent (Fine Oven) (manufactured by Yamato Scientific Co., Ltd., model "DF412S"). The vent was then fully opened, and the temperature was raised from 25°C to 50°C over 30 minutes, followed by heating at 50°C for 48 hours. The mass of the amine compound after heating was measured using an electronic balance and calculated using the following formula: Volatility (%) = ([Mass of amine compound before heating (20 g)] - [Mass of amine compound after 48 hours of heating (g)]) / [Mass of amine compound before heating (20 g)] × 100

[0083] [Examples 1-36 and Comparative Examples 1-3] Water-soluble compositions with the compositions shown in Tables 1-4 were prepared and evaluated as described below. The numerical units for the compositional data in Tables 1-4 are in "mass%". Details of each component used in the preparation of the water-soluble compositions shown in Tables 1-4 are described below.

[0084] <Component (A)> - Ricinoleic acid condensate A1 (Terminal structure: derived from oleic acid, average degree of polymerization: 2.4) - Ricinoleic acid condensate A2 (Terminal structure: derived from oleic acid, average degree of polymerization: 3.4) - Ricinoleic acid condensate A3 (Terminal structure: derived from dodecanoic acid, average degree of polymerization: 2.3) - Ricinoleic acid condensate A4 (Terminal structure: derived from ricinoleic acid, average degree of polymerization: 3.9) - Ricinoleic acid condensate A5 (Terminal structure: derived from oleic acid, average degree of polymerization: 3.9) - Ricinoleic acid condensate A6 (Terminal structure: derived from ricinoleic acid, average degree of polymerization: 5.5)

[0085] <Component (B)> ・Film-forming aid B1: n-hexyl carbitol n-hexyl carbitol has an organic component value of 200 and an inorganic component value of 140 in the organic conceptual diagram. Therefore, n-hexyl carbitol corresponds to a glycol ether compound with an organic component value of 100 or more and an inorganic component value of 60 to 160 in the organic conceptual diagram. ・Film-forming aid B2: butyl carbitol n-butyl carbitol has an organic component value of 160 and an inorganic component value of 140 in the organic conceptual diagram. Therefore, n-butyl carbitol corresponds to a glycol ether compound with an organic component value of 100 or more and an inorganic component value of 60 to 160 in the organic conceptual diagram. ・Film-forming aid B3: 2-ethylhexyl carbitol 2-ethylhexyl carbitol has an organic component value of 240 and an inorganic component value of 140 in the organic conceptual diagram. Therefore, 2-ethylhexylcarbitol corresponds to a glycol ether compound in the organic conceptual diagram that has an organic component of 100 or more and an inorganic component of 60 to 160. • Film-forming aid B4: Lignin (no chemical modification) • Film-forming aid B5: Sodium ligninsulfonate • Film-forming aid B6: Styrene maleic anhydride polymer (average molecular weight 5,000) • Film-forming aid B7: Polyvinylpyrrolidone (average molecular weight 10,000) • Film-forming aid B8: Gum arabic (powder) • Film-forming aid B9: Zein (powder) • Film-forming aid B10: Xylan (powder)

[0086] <Components (C)> • Non-condensed carboxylic acid C1: Dodecanediic acid • Non-condensed carboxylic acid C2: Decanediic acid • Non-condensed carboxylic acid C3: Neodecanoic acid • Non-condensed carboxylic acid C4: n-nonanoic acid • Non-condensed carboxylic acid C5: Isomerized linoleic acid

[0087] <Component (D)> ・Amine compound D1: Cyclohexyldiethanolamine (tertiary amine, volatility: 0.10%, an amine compound that falls under the category of low-volatility amines) ・Amine compound D2: N-methyldiethanolamine (tertiary amine, volatility: 7.00%, an amine compound that falls under the category of low-volatility amines) ・Amine compound D3: N-methyldicyclohexylamine (tertiary amine, volatility: 28.00%)

[0088] <Ingredients (E)> ・Tap water

[0089] <Other ingredients> - Copper inactivator (benzotriazole) - Bactericide / Antifoaming agent

[0090] [Evaluation] <Evaluation 1: Rust Prevention> The water-soluble compositions of Examples 1-36 and Comparative Examples 1-3 were diluted 10 times with tap water, then commercially available SPCC-SD (rust inhibitor removed) was immersed in the water. After removing the SPCC-SD, it was dried at 23°C and then subjected to an exposure test under the eaves. Rust was determined to be present when spot rust occurred. The evaluation criteria were as follows, with evaluations A and B being considered passing. (Evaluation Criteria) A: No rust occurred for 4 weeks. B: Rust occurred between 3 and 4 weeks. C: Rust occurred between 2 and 3 weeks. D: Rust occurred between 1 and 2 weeks. E: Rust occurred within 1 week. (Test Conditions) Test Environment: Corrosion category equivalent to C2-C3 as defined in ISO 9225:2012 (coastal area of ​​Chiba) Test Season: September

[0091] <Evaluation 2: Wetting Spread> The water-soluble compositions of Examples 1-36 and Comparative Examples 1-3 were diluted 10 times with tap water, and commercially available SPCC-SD (rust inhibitor removed) was immersed in the water-soluble compositions. After removing the SPCC-SD and drying it at 23°C, the wetting spread of the water-soluble compositions on the surface of the SPCC-SD was evaluated. Specifically, the surface of the dried SPCC-SD was photographed, and the area of ​​the wet areas (areas that do not reflect light) in the photograph was measured by image analysis. The value was calculated by dividing this by the total area and multiplying by 100. The evaluation criteria were as follows, with evaluations A to E being considered passing. (Evaluation Criteria) A: Wetting area 100% B: Wetting area 90% or more and less than 100% C: Wetting area 80% or more and less than 90% D: Wetting area 70% or more and less than 80% E: Wetting area 60% or more and less than 70% F: Wetting area less than 60%

[0092] The results of Evaluation 1 and Evaluation 2 are shown in Tables 1 to 4.

[0093]

[0094]

[0095]

[0096]

[0097] From Tables 1 to 4, the following can be seen: The water-soluble compositions of Examples 1 to 36 exhibit excellent rust prevention and wetting properties. In contrast, the water-soluble compositions of Comparative Examples 1 to 3 fail to achieve both rust prevention and wetting properties.

Claims

1. A water-soluble composition comprising at least the following components (A) to (E): • Component (A): Ricinoleic acid condensate • Component (B): Film-forming aid • Component (C): Non-condensed carboxylic acid • Component (D): Amine compound • Component (E): Water 2. The water-soluble composition according to claim 1, wherein component (B) is one or more selected from the group consisting of lignin, lignin sulfonic acid, polyvinylpyrrolidone, gum arabic, zein, xylan, styrene maleic anhydride polymer, and glycol ether compounds having an organic content of 100 or more and an inorganic content of 60 to 160 in the organic conceptual diagram.

3. The water-soluble composition according to claim 1 or 2, wherein the average degree of polymerization of component (A) is 2 or more.

4. The water-soluble composition according to any one of claims 1 to 3, wherein component (A) has one or more terminal structures selected from ricinoleic acid-derived and oleic acid-derived terminal structures.

5. The water-soluble composition according to any one of claims 1 to 4, wherein the number of carbon atoms in component (C) is 8 to 24.

6. The water-soluble composition according to any one of claims 1 to 5, wherein component (D) comprises two or more amine compounds whose volatility, calculated from the following formula (i) after heating at 50°C for 48 hours, is 20% or less. Formula (i): Volatility (%) = ([Mass of amine compound before heating] - [Mass of amine compound after heating for 48 hours]) / [Mass of amine compound before heating] × 100 7. The water-soluble composition according to any one of claims 1 to 6, wherein the total amount of components (A) to (E) is 40% by mass or more based on the total amount of the water-soluble composition.

8. The water-soluble composition according to any one of claims 1 to 7, wherein the amount of each component (A) to (D) is within the following ranges, based on a total amount of 100 parts by mass of components (A) to (D): - Component (A): 5 to 50 parts by mass - Component (B): 1 to 40 parts by mass - Component (C): 1 to 40 parts by mass - Component (D): 20 to 60 parts by mass 9. A water-soluble composition according to any one of claims 1 to 8, to be used as a rust inhibitor.

10. A method for using the water-soluble composition described in any one of claims 1 to 9 for rust prevention of metal parts.

11. A method for preventing rust on metal parts, comprising applying a water-soluble composition according to any one of claims 1 to 9 to the metal parts and drying them.

12. A method for producing a water-soluble composition, comprising the step of mixing the following components (A) to (E): Component (A): Ricinoleic acid condensate Component (B): Film-forming aid Component (C): Non-condensed carboxylic acid Component (D): Amine compound Component (E): Water

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