JP2020186358A - Water-soluble metal processing liquid composition and manufacturing method thereof - Google Patents

Abstract

To provide the water-soluble metal processing liquid composition having an excellent rust prevention property and a good scum suppression property.SOLUTION: The water-soluble metal processing liquid composition comprises a branched aliphatic monocarboxylic acid (A1) and a water-soluble amine compound (A2), wherein the branched aliphatic monocarboxylic acid (A1) has a total carbon number of 10 or more to 23 or less, and a main chain thereof has a carbon number of 7 or more to 12 or less.SELECTED DRAWING: None

Description

The present invention relates to a water-soluble metalworking liquid composition and a method for producing the same.

Water-based compositions such as water-soluble metalworking liquid compositions are inferior in rust prevention. Therefore, measures are taken to suppress the occurrence of rust by using a rust preventive agent. Examples of the rust preventive used in the water-soluble metal processing liquid composition include amine salts of carboxylic acids. Patent Document 1 describes that an amine salt of a carboxylic acid such as an alkanolamine salt of a carboxylic acid and an alkanolamine salt of a dicarboxylic acid is used as a rust preventive.

Japanese Unexamined Patent Publication No. 2016-132769

By the way, the water-soluble metal processing liquid composition is usually used after being diluted with water. In the following description, the water used for diluting the water-soluble metalworking liquid composition is also referred to as "diluted water". When an amine salt of a carboxylic acid is used as a rust preventive, calcium ions contained in the diluted water may react with the carboxylic acid or the dicarboxylic acid to form a soap, and a precipitate or a precipitate of the soap may be formed. Such precipitates and precipitates are referred to as "scums". The generation of "scum" becomes more remarkable in water having a high content of metal ions such as calcium ions. Scum causes machine dirt, pipe clogging, and the like. In addition, water having a higher content of metal ions such as calcium ions tends to have lower rust prevention properties. In addition, rust may occur due to the scum adhering to the surface of the processed product (work) and the moisture being re-adsorbed to the scum adhering portion.

From the viewpoint that medium hard water and even hard water can be used without limiting the water used as the diluting water for the water-soluble metalworking liquid composition to soft water, the water-soluble metalworking liquid composition has only rust prevention properties. Not only that, performance that suppresses the generation of scum is also required. In the following description, the performance of suppressing the generation of scum is also referred to as "scum suppression".

However, Patent Document 1 does not study any scum-suppressing property when a rust preventive such as an alkanolamine salt of a carboxylic acid and an alkanolamine salt of a dicarboxylic acid is used in the water-soluble metal processing liquid composition. Therefore, as a result of examination by the present inventor, when an amine salt of undecanedioic acid and an amine salt of dodecanedioic acid, which are amine salts of carboxylic acid having excellent rust prevention property, are used, scum suppression property cannot be ensured and rust prevention It was found that it is not easy to achieve both sex and scum inhibitory properties.

An object of the present invention is to provide a water-soluble metalworking liquid composition and a method for producing the same, which are excellent in rust prevention and scum suppression.

The present inventors have found that the above problems can be solved by using a branched aliphatic monocarboxylic acid having a total carbon number and a carbon number of the main chain in a specific range as the carboxylic acid, and the present invention has been made. Was completed.

That is, the present invention relates to the following [1] to [10].
[1] The branched aliphatic monocarboxylic acid (A1) and the water-soluble amine compound (A2) are contained, and the branched aliphatic monocarboxylic acid (A1) has a total carbon number of 10 or more and 23 or less, and has a main chain. A water-soluble metal processing liquid composition having 7 or more and 12 or less carbon atoms.
[2] The water-soluble metal processing liquid composition according to the above [1], wherein the branched aliphatic monocarboxylic acid (A1) is a compound represented by the following general formula (1).

[In the general formula (1), R ^m is a trivalent linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms. R ^s is a monovalent linear aliphatic hydrocarbon group having 3 or more carbon atoms and 11 or less carbon atoms. However, the carbon number of R ^m (C _m ) and the carbon number of R ^s (C _s ) satisfy the relationship of C _m + 2> C _s . Further, the methyl group in the general formula (1) is bonded to the carbon atom farthest from the α carbon of the carboxyl group among the carbon atoms in R ^m . ]
[3] The water-soluble metalworking liquid composition according to the above [2], wherein R ^m in the general formula (1) is a trivalent saturated linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms.
[4] The water-soluble metal processing according to the above [2] or [3], wherein R ^s in the general formula (1) is a monovalent saturated linear aliphatic hydrocarbon group having 3 or more and 11 or less carbon atoms. Liquid composition.
[5] The difference [(C _m )-(C _s )] between the carbon number of R ^m (C _m ) and the carbon number of R ^s (C _s ) in the general formula (1) is 0 or more and 4 or less. The water-soluble metalworking liquid composition according to any one of the above [2] to [4].
[6] The water-soluble metalworking liquid composition according to any one of [2] to [5] above, wherein R ^s is bonded to the α carbon of the carboxyl group in the general formula (1).
[7] The water-soluble metalworking liquid composition according to any one of the above [1] to [6], wherein the water-soluble amine compound (A2) is an alkanolamine.
[8] The ratio [(base value) / (acid value)] of the base value to the acid value of the water-soluble metal processing liquid composition is 1.0 or more and 3.0 or less, the above [1] to [ 7] The water-soluble metalworking liquid composition according to any one of.
[9] The water-soluble metalworking liquid composition according to any one of the above [1] to [8], which further comprises a base material (B).
[10] It has a step of mixing a branched aliphatic monocarboxylic acid (A1) and a water-soluble amine compound (A2).
The branched aliphatic monocarboxylic acid (A1) is a method for producing a water-soluble metal processing liquid composition, wherein the total carbon number is 10 or more and 23 or less, and the carbon number of the main chain is 7 or more and 12 or less.

According to the present invention, it is possible to provide a water-soluble metalworking liquid composition and a method for producing the same, which are excellent in rust prevention and scum suppression.

In the present specification, numerical values relating to "greater than or equal to", "less than or equal to", "greater than", and "less than" regarding the description of the numerical range can be used in any combination. For example, a combination of the numerical range "preferably 10 or more, more preferably 20 or more" and "preferably 50 or less, more preferably 40 or less", "10 or more and 50 or less", "10 or more and 40 or less", "20". It can be "50 or more and 50 or less" and "20 or more and 40 or less".
Further, in the present specification, the numerical values of Examples are numerical values that can be used as upper limit values or lower limit values.

[Aspects of water-soluble metalworking liquid composition]
The water-soluble metalworking liquid composition of the present invention contains a branched aliphatic monocarboxylic acid (A1) and a water-soluble amine compound (A2), and the branched aliphatic monocarboxylic acid (A1) has a total carbon number of 10. It is a water-soluble metal processing liquid composition having 23 or more and 23 or less and having 7 or more and 12 or less carbon atoms in the main chain.
A water-soluble metal processing liquid composition that satisfies the above requirements is excellent in rust prevention and scum suppression.

In the following description, the branched aliphatic monocarboxylic acid (A1) and the water-soluble amine compound (A2) are also referred to as "component (A1)" and "component (A2)", respectively.
In the following description, the "water-soluble metal processing liquid composition" is also simply referred to as a "processing liquid".
The details of each component in the processing liquid will be described below.

[Branched aliphatic monocarboxylic acid (A1) and water-soluble amine compound (A2)]
The processing liquid of the present invention contains a branched aliphatic monocarboxylic acid (A1) and a water-soluble amine compound (A2).
In addition, not only the branched aliphatic monocarboxylic acid (A1) and the water-soluble amine compound (A2) but also the amine salt (A3) of the branched aliphatic monocarboxylic acid which is a reaction product of these is present in the processing liquid. Can be. Therefore, the amine salt (A3) of the branched aliphatic monocarboxylic acid may also be included in the processing liquid. When the processing liquid also contains an amine salt (A3) of a branched aliphatic monocarboxylic acid, the total content of the branched aliphatic monocarboxylic acid (A1) and the water-soluble amine compound (A2) is the branched aliphatic monocarboxylic acid. Of the (A1) and the water-soluble amine compound (A2), the portion that contributed to the formation of the amine salt (A3) of the branched aliphatic monocarboxylic acid and the portion that contributed to the formation of the amine salt (A3) of the branched aliphatic monocarboxylic acid. It is the total of the amount that did not exist.
Hereinafter, the branched aliphatic monocarboxylic acid (A1) and the water-soluble amine compound (A2) will be described in detail.

<Branched aliphatic monocarboxylic acid (A1)>
The branched aliphatic monocarboxylic acid (A1) used in the present invention is a branched aliphatic monocarboxylic acid having a total carbon number of 10 or more and 23 or less and a main chain having 7 or more and 12 or less carbon atoms.
When the total carbon number of the branched aliphatic monocarboxylic acid is less than 10, and the carbon number of the main chain is less than 7, the scum suppression property can be ensured, but the rust prevention property is inferior.
When the total carbon number of the branched aliphatic monocarboxylic acid is more than 23 and the carbon number of the main chain is more than 12, the branched aliphatic monocarboxylic acid is not dissolved in water.
Further, when a linear aliphatic dicarboxylic acid is used, either rust prevention property or scum suppression property is inferior.

The total number of carbon atoms of the branched aliphatic monocarboxylic acid (A1) in the present specification means the total number of all carbon atoms in the branched aliphatic monocarboxylic acid molecule including the carbon atom of the carboxyl group.
The carbon number of the main chain of the branched aliphatic monocarboxylic acid (A1) is the hydrocarbon chain having the longest chain length among the monovalent branched aliphatic hydrocarbon groups of the branched aliphatic monocarboxylic acid (A1). It means the sum of the number of carbon atoms and the carbon atom of the carboxyl group. If two or more of the monovalent branched aliphatic hydrocarbon groups of the branched aliphatic monocarboxylic acid (A1) have the longest chain length, one of these is used. It will be treated as a main chain.

Here, from the viewpoint of achieving both rust prevention and scum suppression at a higher level, the total carbon number of the branched aliphatic monocarboxylic acid (A1) is preferably 11 or more, more preferably 12 or more. Further, it is preferably 20 or less, more preferably 18 or less, still more preferably 16 or less, still more preferably 15 or less, still more preferably 14 or less.
From the same viewpoint, the number of carbon atoms in the main chain of the branched aliphatic monocarboxylic acid (A1) is preferably 8 or more. Further, it is preferably 11 or less, more preferably 10 or less, and further preferably 9 or less.
Further, from the same viewpoint, the number of branches (side chains) of the monovalent branched aliphatic hydrocarbon group contained in the branched aliphatic monocarboxylic acid (A1) is preferably 3 or less, more preferably 2 or less. More preferably, it is one.
That is, in one aspect of the present invention, as the branched aliphatic monocarboxylic acid (A1), the number of branches (side chains) of the monovalent branched aliphatic hydrocarbon group possessed by the branched aliphatic monocarboxylic acid (A1) is It is preferable to use one compound represented by the following general formula (1).

In the general formula (1), R ^m is a trivalent linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms. R ^s is a monovalent linear aliphatic hydrocarbon group having 3 or more carbon atoms and 11 or less carbon atoms. However, the carbon number of R ^m (C _m ) and the carbon number of R ^s (C _s ) satisfy the relationship of C _m + 2> C _s . That is, in the general formula (1), R ^m constitutes a part of the main chain.
Further, the methyl group in the general formula (1) is bonded to the carbon atom farthest from the α carbon of the carboxyl group among the carbon atoms in R ^m . For example, when the carbon number of R ^m is 10, a methyl group is bonded to the 10th carbon atom counting from the α carbon of the carboxyl group.

The trivalent linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms selected as R ^m may be an unsaturated linear aliphatic hydrocarbon group or a saturated linear aliphatic hydrocarbon group. May be. In the case of an unsaturated linear aliphatic hydrocarbon group, the number and position of double bonds are not particularly limited.
Here, in one aspect of the present invention, from the viewpoint of facilitating the effect of the present invention, R ^m is preferably a trivalent saturated linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms. ..
From the same viewpoint, the number of carbon atoms of the trivalent saturated linear aliphatic hydrocarbon group is preferably 6 or more. Further, it is preferably 9 or less, more preferably 8 or less, and further preferably 7 or less.

The monovalent linear aliphatic hydrocarbon group having 3 or more carbon atoms and 11 or less carbon atoms selected as R ^s may be an unsaturated linear aliphatic hydrocarbon group or a saturated linear aliphatic hydrocarbon group. May be. In the case of an unsaturated linear aliphatic hydrocarbon group, the number and position of double bonds are not particularly limited.
Here, in one aspect of the present invention, R ^s is preferably a monovalent saturated linear aliphatic hydrocarbon group having 3 or more and 11 or less carbon atoms from the viewpoint of making it easier to exert the effect of the present invention. ..
From the same viewpoint, the monovalent saturated linear aliphatic hydrocarbon group preferably has 4 or more carbon atoms. Further, it is preferably 10 or less, more preferably 8 or less, still more preferably 7 or less, still more preferably 6 or less, and even more preferably 5 or less.

Further, in one aspect of the present invention, from the viewpoint of making it easier to exert the effect of the present invention, the carbon number of R ^m (C _m ) and the carbon number of R ^s (C _s ) in the general formula (1) The difference [(C _m )-(C _s )] is preferably 0 or more and 4 or less.
From the viewpoint of making it easier to exert the effect of the present invention, [(C _m )-(C _s )] is preferably 1 or more. Moreover, it is preferably 3 or less.

Further, in one aspect of the present invention, the binding position of R ^s to R ^m is not particularly limited. However, from the viewpoint of making it easier to exert the effect of the present invention, it is preferable that R ^s is bonded to a carbon atom close to the carboxyl group among the carbon atoms of R ^m , and the α carbon and β carbon of the carboxyl group, Alternatively, it is more preferably bonded to γ carbon, further preferably bonded to α carbon or β carbon of a carboxyl group, and even more preferably bonded to α carbon of a carboxyl group.

That is, in one aspect of the present invention, the branched aliphatic monocarboxylic acid (A1) is preferably one or more selected from the compounds represented by the following general formula (2).

In the general formula (1), R ⁿ is a monovalent linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms. R ^s is a monovalent linear aliphatic hydrocarbon group having 3 or more carbon atoms and 11 or less carbon atoms. However, the carbon number of R ⁿ (C _n ) and the carbon number of R ^s (C _s ) satisfy the relationship of C _n + 2> C _s . That is, in the general formula (2), R ⁿ constitutes a part of the main chain.
The compound represented by the general formula (2) has a structure in which R ^s is bonded to the α carbon of the carboxyl group.
The monovalent linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms selected as R ⁿ may be an unsaturated linear aliphatic hydrocarbon group or a saturated linear aliphatic hydrocarbon group. May be. In the case of an unsaturated linear aliphatic hydrocarbon group, the number and position of double bonds are not particularly limited.
Here, in one aspect of the present invention, R ⁿ is preferably a monovalent saturated linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms from the viewpoint of making it easier to exert the effect of the present invention. ..
From the same viewpoint, the monovalent saturated linear aliphatic hydrocarbon group preferably has 6 or more carbon atoms. Further, it is preferably 9 or less, more preferably 8 or less, and further preferably 7 or less.
A preferred embodiment of R ^s is the same as in the case of the above general formula (1).
Further, in one aspect of the present invention, from the viewpoint of making it easier to exert the effect of the present invention, the carbon number of R ⁿ (C _n ) and the carbon number of R ^s (C _s ) in the general formula (2) The difference [(C _n )-(C _s )] is preferably 0 or more and 4 or less.
From the viewpoint of making it easier to exert the effect of the present invention, [(C _n ) − (C _s )] is preferably 1 or more. Moreover, it is preferably 3 or less.

Examples of preferable compounds as the branched aliphatic monocarboxylic acid (A1) used in one aspect of the present invention include 2-butyloctanoic acid, 2-butylnonanoic acid, 2-butyldecanoic acid, 3-butyloctanoic acid, 3-butylnonanoic acid, 3-Butyl decanoic acid, 4-butyl octanoic acid, 4-butyl nonanoic acid, 4-butyl decanoic acid, 2-pentyl octanoic acid, 2-pentyl nonanoic acid, 2-pentyl decanoic acid, 3-pentyl octanoic acid, 3-pentyl nonanoic acid, 3 -Pentyldecanoic acid, 4-pentyloctanoic acid, 4-pentylnonanoic acid, 4-pentyldecanoic acid, 2-hexyloctanoic acid, 2-hexylnonanoic acid, 2-hexyldecanoic acid, 3-hexyloctanoic acid, 3-hexylnonanoic acid, 3 -Hexyldecanoic acid, 4-hexyloctanoic acid, 4-hexylnonanoic acid, 4-hexyldecanoic acid and the like can be mentioned.
Among these, 2-butyloctanoic acid, 2-butylnonanoic acid, 2-butyldecanoic acid, 2-pentyloctanoic acid, 2-pentylnonanoic acid, 2-pentyldecanoic acid, 2-hexyloctanoic acid, 2-hexylnonanoic acid, and 2 It is more preferable to use one or more selected from −hexyldecanoic acid, and further preferably to use one or more selected from 2-butyloctanoic acid and 2-hexyldecanoic acid.
These may be used individually by 1 type, and may be used in combination of 2 or more type.

Here, in one aspect of the present invention, the effect of the present invention is exhibited even when only one type of branched aliphatic monocarboxylic acid (A1) is used alone. In the processing liquid, rust prevention may be ensured by using a plurality of types of carboxylic acids, but in one aspect of the present invention, when one type of branched aliphatic monocarboxylic acid (A1) is used alone. Even if there is, it is possible to achieve both rust prevention and scum suppression at a high level.

(Acid value of branched aliphatic monocarboxylic acid (A1))
The acid value of the branched aliphatic monocarboxylic acid (A1) is preferably 160 mgKOH / g or more, more preferably 180 mgKOH / g or more, still more preferably 200 mgKOH / g or more, from the viewpoint of facilitating the effect of the present invention. is there. Further, it is preferably 350 mgKOH / g or less, more preferably 320 mgKOH / g or less, still more preferably 300 mgKOH / g or less, still more preferably 280 mgKOH / g or less.
In the present specification, the acid value of the branched aliphatic monocarboxylic acid (A1) is defined as "5. Indicator drop determination method" or "7. Potential differential titration" of JIS K 2501 2003 "Petroleum products and lubricating oil-neutralization value test method". It means a value measured in accordance with the law.

(Content of branched aliphatic monocarboxylic acid (A1))
The content of the branched aliphatic monocarboxylic acid (A1) in the processing liquid of one aspect of the present invention is set according to the content of the water-soluble amine compound (A2), and is not particularly limited, but for example. From the viewpoint of storage and transportation, when the processing liquid is concentrated, the content of the branched aliphatic monocarboxylic acid (A1) is preferably 0.1% by mass or more based on the total amount of the processing liquid. , More preferably 1.0% by mass or more, still more preferably 2.0% by mass or more, still more preferably 3.0% by mass or more. Further, it is preferably 10.0% by mass or less, more preferably 8.0% by mass or less, and further preferably 7.0% by mass or less.
In the following description, the concentrated processing solution (in other words, the processing solution before being diluted with diluted water) is also referred to as “undiluted solution”.

When the processing liquid contains a carboxylic acid other than the branched aliphatic monocarboxylic acid (A1), the content of the branched aliphatic monocarboxylic acid (A1) is determined from the viewpoint of facilitating the effect of the present invention. Based on the total amount of carboxylic acid in the processing liquid including the branched aliphatic monocarboxylic acid (A1), it is preferably 50% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more, still more preferably. Is 80% by mass or more, and more preferably 90% by mass or more. The content of the branched aliphatic monocarboxylic acid (A1) may be 100% by mass based on the total amount of the carboxylic acid in the processing liquid including the branched aliphatic monocarboxylic acid (A1).

<Water-soluble amine compound (A2)>
The water-soluble amine compound (A2) used in the present invention is not particularly limited as long as it is a water-soluble amine compound capable of reacting with the branched aliphatic monocarboxylic acid (A1) to form an amine salt, but alkanolamine can be used. It is preferable to use it. Examples of alkanolamines include monoalkanolamines, dialkanolamines, and trialkanolamines.

(Monoalkanolamine)
Monoalkanolamines are amines with one alkanol group.
The carbon number of the alkanol group is preferably 1 or more from the viewpoint of water solubility. Further, it is preferably 10 or less, more preferably 6 or less, and further preferably 4 or less.
The alkyl chain of the alkanol group may be linear, branched or cyclic.
Examples of monoalkanolamines include monoisopropanolamine (MIPA) and monoethanolamine.
One type of monoalkanolamine may be used alone, or two or more types may be used in combination.

(Dialkanolamine)
Dialkanolamines are amines with two alkanol groups.
The two alkanol groups may be the same or different from each other.
The carbon number of each of the two alkanol groups is independently, preferably 1 or more. Further, it is preferably 10 or less, more preferably 6 or less, and further preferably 4 or less.
The total carbon number of the two alkanol groups is preferably 3 or more, more preferably 4 or more, from the viewpoint of water solubility and odor reduction. Further, it is preferably 12 or less, more preferably 10 or less, and further preferably 8 or less.
The alkyl chains of the two alkanol groups may be linear, branched or cyclic, respectively.
Examples of dialkanolamines include linear dialkanolamines such as diethanolamine and N-methyldiethanolamine (MDEA), branched dialkanolamines such as diisopropanolamine, and cyclic dialkanolamines such as N-cyclohexyldiethanolamine. ..
One type of dialkanolamine may be used alone, or two or more types may be used in combination.

(Trialkanolamine)
Trialkanolamines are amines with three alkanol groups.
The three alkanol groups may be the same or different from each other.
The carbon number of each of the three alkanol groups is independently, preferably 1 or more. Further, it is preferably 10 or less, more preferably 6 or less, and further preferably 4 or less.
The total carbon number of the three alkanol groups is preferably 3 or more, more preferably 4 or more, from the viewpoint of water solubility and odor reduction. Further, it is preferably 12 or less, more preferably 10 or less, and further preferably 8 or less.
The alkyl chains of the three alkanol groups may be linear, branched or cyclic, respectively.
Examples of trialkanolamines include triethanolamine, tri-n-propanolamine, tri-i-propanolamine, tri-n-butanolamine and the like.
One type of trialkanolamine may be used alone, or two or more types may be used in combination.

(Preferable embodiment of the water-soluble amine compound (A2))
In one aspect of the present invention, it is preferable to use one or more selected from monoalkanolamine and dialkanolamine as the water-soluble amine compound (A2).

(Base value of water-soluble amine compound (A2))
The base value of the water-soluble amine compound (A2) is preferably 300 mgKOH / g or more, more preferably 350 mgKOH / g or more, still more preferably 400 mgKOH / g or more, from the viewpoint of facilitating the effect of the present invention. Further, it is preferably 750 mgKOH / g or less, more preferably 550 mgKOH / g or less, still more preferably 500 mgKOH / g or less, still more preferably 460 mgKOH / g or less.
In the present specification, the base value of the water-soluble amine compound (A2) is defined as "5. Indicator drop method" or "8. Potential difference drop method" of JIS K 2501 2003 "Petroleum products and lubricating oil-neutralization value test method". It means a value measured according to the "base value / hydrochloric acid method)".

(Content of water-soluble amine compound (A2))
The content of the water-soluble amine compound (A2) in the processing liquid of one aspect of the present invention is set according to the content of the branched aliphatic monocarboxylic acid (A1), and is not particularly limited, but for example. For example, when the processing liquid is in a concentrated state (stock solution) from the viewpoint of storage and transportation, the content of the water-soluble amine compound (A2) is preferably 0.1 based on the total amount of the processing liquid. It is by mass% or more, more preferably 5.0% by mass or more, still more preferably 8.0% by mass or more, and even more preferably 10.0% by mass or more. Further, it is preferably 18.0% by mass or less, more preferably 16.0% by mass or less, and further preferably 14.0% by mass or less.

(Ratio of branched aliphatic monocarboxylic acid (A1) to water-soluble amine compound (A2))
In one embodiment of the working fluid of the present invention, the ratio of the molar amount of the water-soluble amine compound _{(A2) (mol} A2) to the molar amount of branched aliphatic monocarboxylic acids _{(mol A1) [(mol A2} ) / (mol A1 )] Is preferably 1.0 or more, more preferably 1.4 or more, still more preferably 1.8 or more, from the viewpoint of making it easier to exert the effect of the present invention. Further, it is preferably 3.0 or less, more preferably 2.6 or less, and further preferably 2.2 or less.

[Base material (B)]
The processing liquid of one aspect of the present invention preferably contains a base material (B).
In the following description, the "base material (B)" is also referred to as "component (B)".
The processing liquid of one aspect of the present invention is an emulsion-type water-soluble cutting fluid classified into JIS A1, a solveable-type water-soluble cutting fluid classified into JIS A2, and a chemical solution classified into JIS A3. It may be any aspect of the water-soluble cutting fluid of the mold. Therefore, the base material (B) may be one or more selected from water (B1) and base oil (B2). That is, the base material (B) may be composed of only water (B1) or only the base oil (B2), and both the water (B1) and the base oil (B2). It may consist of.
Here, the processing liquid of one aspect of the present invention is a form of a solvable type water-soluble cutting oil classified into JIS A2 type and a chemical solution type water-soluble cutting oil classified into JIS A3 type. It is more preferable that the mode is a chemical solution type water-soluble cutting fluid classified into JIS A3 type.
From this point of view, in the processing liquid of one aspect of the present invention, the content of water (B1) in the base material (B) is preferably 60% by mass or more, more preferably 60% by mass or more, based on the total amount of the base material (B). It is 70% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, and even more preferably 100% by mass.
When the content of water (B1) in the base material (B) is less than 100% by mass based on the total amount of the base material (B), the rest of the base material (B) other than water (B1) is , Base oil (B2).

Hereinafter, water (B1) and base oil (B2) will be described in detail.

<Water (B1)>
The water (B1) used as the base material (B) is not particularly limited, and purified water such as distilled water and ion-exchanged water (deionized water), tap water, industrial water and the like can be used.

Here, it is preferable to select the type of water (B1) according to the situation in which the processing liquid is used.
For example, when storing and transporting a processing liquid, the processing liquid is usually in a concentrated state (stock solution). In the following description, the water (B1) used when preparing the undiluted solution is also referred to as "prepared water (B1-1)".
When the processing liquid is used for metal processing, it is preferable that the stock solution is further diluted with water (B1) and the processing liquid is used in a diluted state. In the following description, the diluted processing liquid is also referred to as "diluted liquid". Further, the water (B1) used for diluting the "stock solution" is also referred to as "diluted water (B1-2)".
Hereinafter, the prepared water (B1-1) and the diluted water (B1-2) will be described in detail.

(Prepared water (B1-1))
As the prepared water (B1-1), purified water such as distilled water and ion-exchanged water (deionized water), tap water, industrial water, etc. can be used, but the undiluted solution is diluted with water (diluted water at the time of metal processing later). From the viewpoint of improving scum suppression when diluted with B1-2), water having low hardness such as distilled water and purified water such as ion-exchanged water (deionized water) is preferable.
Specifically, the prepared water (B1-1) has, for example, preferably a hardness of 30 or less, more preferably a hardness of 20 or less, still more preferably a hardness of 10 or less, still more preferably a hardness of 5 or less, and even more preferably a hardness of 2. It is as follows. Moreover, the hardness is usually 0.1 or more.
Here, from the viewpoint of improving the stability of the stock solution, the content of the prepared water (B1-1) with respect to a total of 100 parts by mass of the component (A1) and the component (A2) is preferably 100 parts by mass or more, more preferably 100 parts by mass or more. It is 200 parts by mass or more, more preferably 300 parts by mass or more. Further, it is preferably 700 parts by mass or less, more preferably 600 parts by mass or less, and further preferably 500 parts by mass or less.
From the same viewpoint, the content of the prepared water (B1-1) based on the total amount of the processing liquid is preferably 50% by mass or more, more preferably 60% by mass or more, and further preferably 70% by mass or more. .. Further, it is preferably 90% by mass or less, more preferably 85% by mass or less, and further preferably 80% by mass or less.

(Diluted water (B1-2))
The type of water used as the diluted water (B1-2) is not limited, and medium hard water or hard water can be used. Since the processing liquid of the present invention has good scum-suppressing properties, scum generation can be suppressed even when water having a high calcium content is used as diluted water (B1-2). In other words, the processing liquid of the present invention is excellent in hard water stability.
Therefore, the diluted water (B1-2) may have a hardness of 60 or more, a hardness of 100 or more, a hardness of 200 or more, a hardness of 300 or more, and a hardness of, for example. It may be 400 or more, and the hardness may be 500 or more. As described above, even when water having high hardness is used as diluted water (B1-2), the generation of scum is suppressed. The diluted water (B1-2) usually has a hardness of 1000 or less.
Here, from the viewpoint of improving the stability of the diluted solution and effectively exerting the performance of the component (A1) and the component (A2) in the processing solution, the volume ratio of the diluted water (B1-2) to the stock solution. The [diluted water (B1-2) / stock solution] is preferably 80/20 or more and 99/1 or less, more preferably 85/15 or more and 98/2 or less, and further preferably 90/10 or more and 97/3 or less.

<Base oil (B2)>
The base oil (B2) used as the base material (B) is not particularly limited, and one or more selected from mineral oil and synthetic oil can be used.
As the mineral oil, a paraffin-based crude oil, an intermediate-based crude oil, a residual oil obtained by atmospheric-distilling a naphthen-based crude oil, a distillate obtained by vacuum-distilling a residual oil of atmospheric-pressure distillation, and further, these are usually used. Examples of the refined oil obtained by refining according to the method include solvent refined oil, hydrogenated refined oil, delamination treated oil, dewaxed treated oil, white clay treated oil, hydrorefined treated oil and the like.
Examples of synthetic oils include poly-α-olefin, α-olefin copolymer, polybutene, alkylbenzene, polyol ester, dibasic acid ester, fatty acid ester, polyoxyalkylene glycol, polyoxyalkylene glycol ester, and polyoxyalkylene glycol ether. Examples include hindered esters and silicone oils. In addition, synthetic oil obtained by isomerizing a wax (GTL wax (Gas To Liquids WAX)) produced by the Fischer-Tropsch method or the like can also be mentioned.
As the base oil (B2), one having a kinematic viscosity at 40 ° C. of 1 mm ² / s or more and 1000 mm ² / s or less is generally used. The kinematic viscosity of the base oil (B2) at 40 ° C. is preferably 2 mm ² / s or more, more preferably 5 mm ² / s or more, and further preferably 10 mm ² / s or more. Further, it is preferably 500 mm ² / s or less, more preferably 400 mm ² / s or less, and further preferably 300 mm ² / s or less.
In the present specification, the kinematic viscosity at 40 ° C. means a value measured according to JIS K 2283: 2000.
The content of the base oil (B2) is preferably 0% by mass or more and 80% by mass or less, more preferably 0% by mass or more and 50% by mass or less, and further preferably 0% by mass or more and 10% by mass based on the total amount of the processing liquid. It is less than% by mass.

Here, when the processing liquid of one aspect of the present invention contains the component (B), the total content of the component (A1), the component (A2), and the component (B) is preferably based on the total amount of the processing liquid. Is 70% by mass or more, more preferably 75% by mass or more, still more preferably 80% by mass or more. Further, in the processing liquid of one aspect of the present invention, the total content of the component (A1), the component (A2), and the component (B) may be 100% by mass based on the total amount of the processing liquid.
When the processing liquid of one aspect of the present invention contains a component (A1), a component (A2), and a component (C) other than the component (B), the component (A1), the component (A2), The upper limit of the total content of the component (B) and the component (B) may be adjusted in relation to the content of the other component (C), preferably 95% by mass or less, more preferably 90% by mass or less, still more preferably. Is 85% by mass or less.
Hereinafter, the other component (C) will be described.

[Other component (C)]
Examples of the other component (C) include surfactants, lubricity improvers, metal deactivators, defoamers, preservatives, antioxidants and the like.

(Surfactant)
Examples of the surfactant include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants. Examples of the nonionic surfactant include ethers such as polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkylene ether and polyoxyethylene alkyl phenyl ether, and amides such as fatty acid alkanolamide. Examples of the anionic surfactant include alkylbenzene sulfonates and alpha olefin sulfonates. Examples of the cationic surfactant include quaternary ammonium salts such as alkyltrimethylammonium salt, dialkyldimethylammonium salt and alkyldimethylbenzylammonium salt. Examples of the amphoteric surfactant include alkyl betaine as a betaine type.

(Lubricability improver)
Examples of the lubricity improver include vegetable oils such as castor oil and rapeseed oil, fats and oils such as lanolin, and refined products thereof.

(Metal inactivating agent, antioxidant)
Examples of the metal inactivating agent include benzotriazole, imidazoline, pyrimidine derivative, thiadiazole, sodium phosphate salt, and phosphate ester derivative.
Antioxidants include amine-based antioxidants such as alkylated diphenylamine, phenyl-α-naphthylamine, alkylated phenyl-α-naphthylamine; 2,6-di-t-butylphenol, 4,4'-methylenebis (2, 6-di-t-butylphenol), isooctyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, n-octadecyl-3- (3,5-di-t-butyl-4-) Phenolic antioxidants such as hydroxyphenyl) propionate; sulfur-based antioxidants such as dilauryl-3,3'-thiodipropionate; phosphorus-based antioxidants such as phosphite; and molybdenum-based antioxidants. Be done.

(Preservative)
Examples of preservatives include triazine-based preservatives, alkylbenzimidazole-based preservatives, isothiazoline-based preservatives, pyridine-based preservatives, phenol-based preservatives, and pyrithion-based preservatives.

(Defoamer)
Examples of the defoaming agent include silicone compounds and polyether compounds.

The content of the other component (C) is preferably 0.1% by mass or more, more preferably 0.1% by mass or more, based on the total amount of the water-soluble metal processing liquid composition, independently from the viewpoint of fully exerting the effect of each component. Is 0.5% by mass or more, more preferably 1% by mass or more. Further, it is preferably 15% by mass or less, more preferably 10% by mass or less, and further preferably 5% by mass or less.

When the processing liquid of one aspect of the present invention contains the above component (B) and further the above component (C), the total content of the above component (A), the above component (B), and the above component (C). Is preferably 75% by mass or more, more preferably 80% by mass or more, and further preferably 85% by mass or more based on the total amount of the processing liquid. Further, in the processing liquid of one aspect of the present invention, even if the total content of the above component (A), the above component (B), and the above component (C) is 100% by mass based on the total amount of the processing liquid. Good.
The processing liquid of one aspect of the present invention may contain a liquid component different from the above component (B) in order to disperse and dissolve the above component (A1) and the above component (A2).

[Physical properties of water-soluble metalworking liquid composition]
The water-soluble metal processing liquid composition according to one aspect of the present invention has a ratio of base value to acid value [(base value) / (acid value)] of preferably 1.0 or more, more preferably 1.4 or more. , More preferably 1.8 or more. Further, it is preferably 3.0 or less, more preferably 2.6 or less, and further preferably 2.2 or less.
By adjusting the ratio [(base value) / (acid value)] of the base value to the acid value within this range, the reaction product of the branched aliphatic monocarboxylic acid (A1) and the water-soluble amine compound (A2). It is possible to easily improve the solubility of the amine salt (A3) of the branched aliphatic monocarboxylic acid (A3) in the processing liquid, and it is possible to make it easier to exert the effect of the present invention.
In the present specification, the base value of the water-soluble metalworking liquid composition is defined as "5. Indicator drop method" or "8. Potential difference drop method" of JIS K 2501 2003 "Petroleum products and lubricating oil-neutralization value test method". It means a value measured according to the "base value / potassium method)".
In the present specification, the acid value of the water-soluble metalworking liquid composition is defined as "5. Indicator drop method" or "7. Potential difference drop method" of JIS K 2501 2003 "Petroleum products and lubricating oil-neutralization value test method". Means the value measured according to.

[Manufacturing method of water-soluble metal processing liquid composition]
The method for producing a water-soluble metalworking liquid composition of the present invention includes a step of mixing a branched aliphatic monocarboxylic acid (A1) and a water-soluble amine compound (A2), and the branched aliphatic monocarboxylic acid (A1). Has a total carbon number of 10 or more and 23 or less, and a main chain having a carbon number of 7 or more and 12 or less.
According to the method for producing a water-soluble metal processing liquid composition of the present invention, it is possible to produce a water-soluble metal processing liquid composition having excellent rust prevention properties and scum suppression properties.
In the method for producing a water-soluble metalworking liquid composition according to one aspect of the present invention, in addition to the branched aliphatic monocarboxylic acid (A1) and the water-soluble amine compound (A2), the base material (B) and other components ( C) may be mixed.
The above-mentioned component (A1) and the above-mentioned component (A2) and their blending amounts, the above-mentioned component (B) and their blending amounts, other components (C) and their blending amounts, and other details are described in the present invention. It is the same as the content described about the water-soluble metal processing liquid composition of.

[How to use the water-soluble metal processing liquid composition]
The water-soluble metal processing liquid composition is used for metal processing.
As a type of metal processing, it can be suitably used in various metal processing fields such as cutting, grinding, punching, polishing, drawing, drawing, rolling, etc., but in cutting and grinding It is preferable to have.
Examples of the cutting process include turning, milling, boring, drilling (drilling, screwing, reamer finishing), gear cutting, planing, shaping, vertical cutting, broaching, gear shaping and the like.
Examples of the grinding process include a method of grinding a metal with a grinding belt. The grinding belt is a polishing tool made of an endless belt in which an abrasive (abrasive grains) is adhered to a substrate surface made of cloth, paper, plastic, rubber, etc., and is usually used in grinding. It can be used by appropriately selecting the one. As the abrasive grains, for example, alumina can be used. The metal to be processed by this method is, for example, stainless steel, alloy steel, carbon steel, aluminum alloy, copper alloy and the like.
Based on the above, the present invention also provides a method for using the following water-soluble metalworking liquid composition.
(1) A method for using a water-soluble metal processing liquid composition, wherein the water-soluble metal processing liquid composition of the present invention is used for metal processing.
(2) A method for using a water-soluble metal processing liquid composition, wherein the water-soluble metal processing liquid composition of the present invention is used for cutting or grinding a metal.
The water-soluble metalworking liquid composition used in the method of use may be a stock solution or a diluted solution diluted with diluted water (B1-2), but must be a diluted solution. Is preferable.

The present invention will be specifically described with reference to the following examples, but the present invention is not limited to the following examples.

[Various physical property values]
(1) Acid value The acid value of the carboxylic acid and the acid value of the water-soluble metalworking liquid composition conform to "5. Indicator drop determination method" of JIS K 2501 2003 "Petroleum products and lubricating oil-neutralization value test method". And measured.
(2) Base value The base value of the water-soluble amine compound and the base value of the water-soluble metalworking liquid composition are determined in "5. Indicator drop determination method" of JIS K 2501 2003 "Petroleum products and lubricating oil-neutralization value test method". Measured according to.

[Examples 1 and 2 and Comparative Examples 1 to 5]
A water-soluble metalworking solution composition is prepared with the raw materials and blending amounts shown in Table 1, and a diluted solution obtained by diluting the water-soluble metalworking solution composition to a specific concentration is used to improve rust prevention and scum suppression. evaluated.
The unit of the blending amount of the raw materials shown in Table 1 is "mass%".

<Raw materials>
The raw materials used in Examples 1 and 2 and Comparative Examples 1 and 5 are as follows.

(I) Carboxylic acid The following branched aliphatic monocarboxylic acid (A1) and linear aliphatic dicarboxylic acid were used.
(1) Branched aliphatic monocarboxylic acid (A1)
(1-1) 2-Butyloctanoic acid

・ Total carbon number: 12
・ Carbon number of main chain: 8
-R ^m : saturated linear aliphatic hydrocarbon group having 6 carbon atoms in the general formula (1) -R ⁿ : saturated linear aliphatic hydrocarbon group having 6 carbon atoms in the general formula (2) R ^s in the general formulas (1) and (2): Saturated linear aliphatic hydrocarbon group having 4 carbon atoms · [(C _m )-(C _s )] = 2
・ [(C _n )-(C _s )] = 2
・ R ^s bond position: α carbon of carboxyl group ・ Acid value: 269 mgKOH / g

(1-2) 2-Hexyldecanoic acid

・ Total carbon number: 16
・ Carbon number of main chain: 10
-R ^m : saturated linear aliphatic hydrocarbon group having 8 carbon atoms in the general formula (1) -R ⁿ : saturated linear aliphatic hydrocarbon group having 8 carbon atoms in the general formula (2) R ^s in the general formulas (1) and (2): Saturated linear aliphatic hydrocarbon group having 6 carbon atoms · [(C _m )-(C _s )] = 2
・ [(C _n )-(C _s )] = 2
・ R ^s bond position: α carbon of carboxyl group ・ Acid value: 216 mgKOH / g

(1-3) 2-Ethylhexanoic acid

・ Total carbon number: 8
・ Carbon number of main chain: 6
-R ^m : saturated linear aliphatic hydrocarbon group having 4 carbon atoms in the general formula (1) -R ⁿ : saturated linear aliphatic hydrocarbon group having 4 carbon atoms in the general formula (2) R ^s in the general formulas (1) and (2): Saturated linear aliphatic hydrocarbon group having 2 carbon atoms · [(C _m )-(C _s )] = 2
・ [(C _n )-(C _s )] = 2
・ R ^s bond position: α carbon of carboxyl group ・ Acid value: 389 mgKOH / g

(1-4) 2-decyltetradecanoic acid

・ Total carbon number: 24
・ Carbon number of main chain: 14
-R ^m : saturated linear aliphatic hydrocarbon group having 12 carbon atoms in the general formula (1) -R ⁿ : saturated linear aliphatic hydrocarbon group having 12 carbon atoms in the general formula (2) R ^s in the general formulas (1) and (2): Saturated linear aliphatic hydrocarbon group having 10 carbon atoms · [(C _m )-(C _s )] = 2
・ [(C _n )-(C _s )] = 2
・ R ^s bond position: α carbon of carboxyl group ・ Acid value: 149 mgKOH / g

(2) Linear aliphatic dicarboxylic acid (2-1) Decanedioic acid

・ Total carbon number: 10
・ Carbon number of main chain: 10
-Acid value: 555 mgKOH / g

(2-2) Undecanedioic acid

・ Total carbon number: 11
・ Carbon number of main chain: 11
-Acid value: 526 mgKOH / g

(2-3) Dodecanedioic acid

・ Total carbon number: 12
・ Carbon number of main chain: 12
-Acid value: 489 mgKOH / g

(II) Water-soluble amine compound (A2)
N-Methyldiethanolamine (base value: 434 mgKOH / g, dialkanolamine) was used.
In Table 1, "N-methyldiethanolamine" is abbreviated as "MDEA".

(III) Base material (B)
It was water (B1).
Water (B1) was used as prepared water (B1-1) for preparing a water-soluble metalworking liquid composition.
The prepared water (B1-1) was ion-exchanged water.

<Evaluation method>
(1) Evaluation of Rust Prevention The water-soluble metalworking liquid composition prepared in Examples 1 and 2 and Comparative Examples 1 to 5 was diluted with diluted water (B1-2) to obtain a diluted liquid.
The diluted water (B1-2) was ion-exchanged water.
The diluted solution was prepared so that the concentration of the water-soluble metalworking liquid composition prepared in Examples 1 and 2 and Comparative Examples 1 to 5 was 3.0% by volume. The acid value of the diluent was 0.83 mgKOH / g. Hereinafter, the diluent will be referred to as a "rust preventive evaluation diluent".
The rust prevention property was evaluated by the following procedure.
According to DIN 51360-12-A, 2 g of casting chips (Fc-250) was placed on a filter paper in a petri dish, 2 mL of each water-soluble rust preventive solution was added dropwise, the petri dish was covered, and the dish was left for 2 hours. After 2 hours, the state of rust transferred to the filter paper was displayed in 5 stages according to the following criteria.
(Criteria)
0: No rust (no rust is found)
1: Traces of rust (maximum 3 rusts (diameter does not exceed 1 mm))
2: Slight rust (discoloration of less than 1% of the area (rust larger than the criterion 1))
3: Moderate rust (1% or more and less than 5% of the area)
4: Severe rust (discoloration of 5% or more of the area)

(2) Evaluation of Scum Suppression The water-soluble metalworking solution composition prepared in Examples 1 and 2 and Comparative Examples 1 to 5 was diluted with diluted water (B1-2) to obtain a diluted solution.
The diluted water (B1-2) was hard water adjusted to a hardness of 500 by adding calcium chloride to ion-exchanged water.
The diluent was prepared so that the concentration of the water-soluble metalworking liquid composition prepared in Examples 1 and 2 and Comparative Examples 1 to 5 was 5.0% by volume, and was more water-soluble than in the rust prevention evaluation. The concentration of the metalworking liquid composition was increased to make the conditions more likely to generate scum. The acid value of the diluent was 1.38 mgKOH / g. Hereinafter, the diluted solution will be referred to as a "diluted solution for evaluating scum inhibitory property".
After allowing the diluted solution for evaluation of scum suppression to stand at 23 ° C. for 4 hours, the presence or absence of precipitation was evaluated, and the one without precipitation was evaluated as "A", and the one with precipitation was evaluated as "F". ".

The results are shown in Table 1.

From Table 1, the following can be seen.
The water-soluble metalworking liquid compositions of Examples 1 and 2 using branched aliphatic monocarboxylic acids having a total carbon number of 10 or more and 23 or less and a main chain carbon number of 7 or more and 12 or less are rust preventive. It can be seen that both the property and the scum suppressing property are excellent, and both the rust prevention property and the scum suppressing property can be achieved at the same time. In particular, it can be seen that the water-soluble metalworking liquid composition of Example 1 has both rust prevention and scum suppression at an extremely high level.
On the other hand, even when the branched aliphatic monocarboxylic acid is used, the total number of carbon atoms of the branched aliphatic monocarboxylic acid is less than 10 as in the water-soluble metal processing liquid composition of Comparative Example 1. It can be seen that when the number of carbon atoms in the main chain is less than 7, the scum suppression property is excellent, but the rust prevention property is inferior.
Further, even when the branched aliphatic monocarboxylic acid is used, the total carbon number of the branched aliphatic monocarboxylic acid is larger than 23, as in the water-soluble metal processing liquid composition of Comparative Example 2, and the main chain. If the number of carbon atoms in the compound is also larger than 12, it can be seen that the branched aliphatic monocarboxylic acid is insoluble in water.
Further, the water-soluble metalworking liquid compositions of Comparative Examples 3 to 5 in which a linear aliphatic dicarboxylic acid is used instead of the branched aliphatic monocarboxylic acid do not satisfy either rust prevention property or scum suppression property. You can see that.

Claims (10)

Contains branched aliphatic monocarboxylic acid (A1) and water-soluble amine compound (A2),
The branched aliphatic monocarboxylic acid (A1) is a water-soluble metal processing liquid composition having a total carbon number of 10 or more and 23 or less and a main chain having 7 or more and 12 or less carbon atoms. The water-soluble metal processing liquid composition according to claim 1, wherein the branched aliphatic monocarboxylic acid (A1) is a compound represented by the following general formula (1).

[In the general formula (1), R ^m is a trivalent linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms. R ^s is a monovalent linear aliphatic hydrocarbon group having 3 or more carbon atoms and 11 or less carbon atoms. However, the carbon number of R ^m (C _m ) and the carbon number of R ^s (C _s ) satisfy the relationship of C _m + 2> C _s . Further, the methyl group in the general formula (1) is bonded to the carbon atom farthest from the α carbon of the carboxyl group among the carbon atoms in R ^m . ] The water-soluble metalworking liquid composition according to claim 2, wherein R ^m in the general formula (1) is a trivalent saturated linear aliphatic hydrocarbon group having 5 or more and 10 or less carbon atoms. The water-soluble metalworking liquid composition according to claim 2 or 3, wherein R ^s in the general formula (1) is a monovalent saturated linear aliphatic hydrocarbon group having 3 or more and 11 or less carbon atoms. Claim that the difference [(C _m )-(C _s )] between the carbon number of R ^m (C _m ) and the carbon number of R ^s (C _s ) in the general formula (1) is 0 or more and 4 or less. Item 2. The water-soluble metal processing liquid composition according to any one of Items 2 to 4. The water-soluble metalworking liquid composition according to any one of claims 2 to 5, wherein R ^s is bonded to α carbon of a carboxyl group in the general formula (1). The water-soluble metalworking liquid composition according to any one of claims 1 to 6, wherein the water-soluble amine compound (A2) is an alkanolamine. Any 1 of claims 1 to 7, wherein the ratio [(base value) / (acid value)] of the base value to the acid value of the water-soluble metal processing liquid composition is 1.0 or more and 3.0 or less. The water-soluble metalworking liquid composition according to the section. The water-soluble metalworking liquid composition according to any one of claims 1 to 8, further comprising a base material (B). It has a step of mixing a branched aliphatic monocarboxylic acid (A1) and a water-soluble amine compound (A2).
The branched aliphatic monocarboxylic acid (A1) is a method for producing a water-soluble metal processing liquid composition, wherein the total carbon number is 10 or more and 23 or less, and the carbon number of the main chain is 7 or more and 12 or less.