JP5785625B2 - Metalworking fluid - Google Patents

Description

  The present invention relates to a metal working fluid used when forming a metal material.

Conventionally, when a metal plate such as an aluminum plate or an iron plate is formed and processed, a volatile oil-based metal working fluid has been used as a lubricant. Moreover, in order to improve hydrophilicity, the thing which apply | coated the surface of the water dispersible silica compound etc. is widely used for the aluminum plate used as fin materials, such as various heat exchangers. Furthermore, in order to protect this surface layer, an aluminum plate coated with hydrophilic polyethylene glycol has also been proposed (see Patent Document 1).
On the other hand, oil-based metalworking fluids are not sufficiently dry and require high-temperature drying with hot air, so it is necessary to cope with fire prevention. In addition, the burden on workers and the environment due to VOC (Volatile Organic Compounds) is also a problem. Accordingly, water-soluble metalworking fluids that are excellent in cooling properties and infiltration properties, have no danger of fire, and have a low environmental load have come to be used frequently. And a water-soluble metalworking fluid may be used also to the aluminum plate which has a hydrophilic surface as mentioned above.

Japanese Patent Laid-Open No. 09-014888

  However, if it is an oil-based metalworking fluid, it does not attack the hydrophilic surface described above, but since the water-soluble metalworking fluid is diluted with water and used, it dissolves the hydrophilic substance on the surface of the metal plate. Therefore, there is a possibility that the slipperiness of the metal surface at the time of forming may be deteriorated.

  Accordingly, the present invention provides a metal processing oil that can maintain sufficient lubricity even for a metal material having a hydrophilic surface without impairing the hydrophilicity of the surface, and is excellent in processing performance of the metal material. With the goal.

In order to solve the above problems, the present invention provides the following metalworking fluid. (1) (A) the following components, that Do blended with (B) a, (C), and component (D) and at least one kind of acidic phosphoric acid esters and phosphorous acid esters a water-soluble metalworking fluid,
(A) C8-C12 carboxylic acid (B) trialkanolamine (C) water-soluble polymer (D) water having a mass average molecular weight of 200 or more
The component (C) is a compound represented by the following formula (1),
^{_{R 1 - [(OR 2)}} m1 -OR 3] n1 (1)
(In the formula, R ¹ is a hydrogen atom, a hydrocarbyl group having 1 to 10 carbon atoms, an oxygen-containing hydrocarbyl group having 2 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, and a carbon number 1 having 2 to 6 bonding parts. R ² is an alkylene group having 2 to 4 carbon atoms, R ³ is a hydrogen atom, a hydrocarbyl group having 1 to 10 carbon atoms, an oxygen-containing hydrocarbyl group having 2 to 10 carbon atoms, and It is any of acyl groups having 2 to 10 carbon atoms, n1 is an integer of 1 to 6, and m1 is a number with an average value of m1 × n1 of 6 to 80.)
The water-soluble metalworking fluid characterized in that the blending amounts of the component (A), the component (B), and the component (C) are as follows based on the total amount of the water-soluble metalworking fluid.
(A) component: 20 mass% or more and 40 mass% or less
(B) component: 20 mass% or more and 40 mass% or less
Component (C): 1% by mass or more and 15% by mass or less ( 2 ) The water-soluble metalworking fluid according to (1) above, further comprising a metal deactivator. Metal processing oil.
( 3 ) In the water-soluble metalworking fluid according to (1) or (2) , the component (A), the component (B), the component (C), the component (D), and the acidic phosphorus A water-soluble metalworking fluid characterized by comprising an acid ester.
(4) (A) the following components, (B) component, a water-soluble, characterized in that by blending a component (C), and component (D), acidic phosphoric acid ester Oyo via phosphoric acid ester Metalworking fluid.
(A) Carboxylic acid having 8 to 12 carbon atoms
(B) Trialkanolamine
(C) Water-soluble polymer having a mass average molecular weight of 200 or more
(D) Water ( 5 ) The water-soluble metalworking fluid according to any one of (1) to ( 4 ) above is diluted with water at a volume ratio of 2 to 200 times. Metalworking fluid.
( 6 ) The metalworking fluid according to the above ( 5 ) is for aluminum processing.

  The water-soluble metalworking fluid of the present invention exhibits excellent lubricity and processing performance for various metal materials when diluted with water. It is particularly excellent for plastic working of aluminum fins. Further, sufficient lubricity can be maintained even when the surface of the aluminum fin is coated with a hydrophilic resin.

The water-soluble metalworking fluid of the present invention (hereinafter also simply referred to as “oil”) is a stock solution for use in various metalworking by diluting in water. The following (A) component, (B) component, ( C) and (D) component are mix | blended.
(A) C8-C18 carboxylic acid (B) Trialkanolamine (C) Water-soluble polymer (D) Water having a mass average molecular weight of 200 or more

The component (A) is a carboxylic acid having 8 to 18 carbon atoms, preferably 10 to 16 carbon atoms. When the carbon number is 7 or less, the friction reducing effect is lowered, which is not preferable. On the other hand, even if the number of carbon atoms is 19 or more, an improvement in the friction reduction effect cannot be expected, which is not economical.
The carboxylic acid may be a monocarboxylic acid or a polycarboxylic acid (such as a dibasic acid). Moreover, although there exist aromatic carboxylic acid and fatty acid as carboxylic acid, a fatty acid (aliphatic carboxylic acid) is suitable from a water-soluble and lubricous viewpoint. The carboxylic acid may be a saturated fatty acid or an unsaturated fatty acid.
Specifically, as saturated fatty acids, caprylic acid (octanoic acid), pelargonic acid (nonanoic acid), capric acid (decanoic acid), lauric acid (dodecanoic acid), myristic acid (tetradecanoic acid), palmitic acid (hexadecanoic acid) , Margaric acid (heptadecanoic acid), stearic acid (octadecanoic acid), and the like. These fatty acids are not limited to straight chain structures, but include all branched isomers such as isooctanoic acid and neodecanoic acid. Examples of unsaturated fatty acids include octenoic acid, decenoic acid, docosenoic acid, and oleic acid. The inclusion of all branched isomers, not limited to linear structures, is the same as saturated fatty acids.

From the viewpoint of defoaming properties and stability of hard water when the oil agent is diluted with water, lauric acid having 8 to 12 carbon atoms, caproic acid, nonanoic acid, isononanoic acid, decanoic acid, neodecanoic acid (octanoic acid) , A mixture of nonanoic acid and decanoic acid), examples of the dicarboxylic acid include nonanedioic acid having 9 to 12 carbon atoms, undecanedioic acid, sebacic acid, dodecanedioic acid and the like.
In particular, the above-mentioned isononanoic acid is excellent in the effect (hard water stability) of reducing the formation of a solid on the liquid surface when the oil agent (stock solution) is diluted with water.
Moreover, as an alkyl group which comprises the principal chain of a fatty acid, what has a branched structure is preferable at the point of spoilage resistance. In particular, the above-mentioned isononanoic acid is also excellent in the effect (hard water stability) of reducing the formation of a solid on the liquid surface when the oil agent (stock solution) is diluted with water.
When using a dibasic acid as a fatty acid, the salt is better when used as a salt, but from the viewpoint of the stability of the stock solution (hard to insolubilize), a dibasic acid and a monobasic acid are mixed. It is also preferable to use them.

  The blending amount of the component (A) is preferably 20% by mass or more and 40% by mass or less, and more preferably 25% by mass or more and 35% by mass or less, based on the total amount of the water-soluble metalworking fluid. When the blending amount of the component (A) is less than 20% by mass, the synergistic effect (formation of salt) with the component (B) described later is poor, and the lubricity may not be sufficiently exhibited when the oil agent is diluted with water. There is. On the other hand, when the blending amount of the component (A) exceeds 40% by mass, the blending amount is excessive with respect to the component (B) described later, and the lubricity as a metalworking fluid cannot be sufficiently exhibited.

The component (B) is trialkanolamine and contributes to improvement of lubricity and reduction of odor. Here, the three alkanol groups may be the same or different, but each carbon number is preferably 1 or more and 10 or less. If there is an alkanol group having more than 10 carbon atoms, the water solubility is lowered, which is not preferable. Moreover, it is preferable that the total carbon number of three alkanol groups is 3-12. If the total number of carbon atoms of the three alkanol groups is less than 3, odor may be generated, which is not preferable. On the other hand, if the total number of carbon atoms of the three alkanol groups is 13 or more, the water solubility decreases, which is not preferable.
Examples of such alkanolamines include triethanolamine, tri-n-propanolamine, tri-i-propanolamine, and tri-n-butanolamine. Triethanolamine is a water-soluble point. preferable.

  The blending amount of the component (B) is preferably 20% by mass or more and 40% by mass or less, and more preferably 25% by mass or more and 35% by mass or less, based on the total amount of the water-soluble metalworking fluid. When the blending amount of the component (B) is less than 20% by mass, the synergistic effect (formation of salt) with the component (A) is poor, and the lubricity may not be sufficiently exhibited when the oil agent is diluted with water. . On the other hand, when the blending amount of the component (B) exceeds 40% by mass, the blending amount is too large with respect to the component (A), and the lubricity as a metalworking fluid cannot be sufficiently exhibited.

The component (C) is a water-soluble polymer, and imparts lubricity to the metal surface when the oil agent is diluted with water and used as a metal processing oil agent in metal processing. Furthermore, when the metal working fluid of the present invention is applied to a metal plate coated with a hydrophilic substance, it functions to control the solubility of the hydrophilic substance.
The water-soluble polymer that can be used as the component (C) is not particularly limited as long as the mass average molecular weight is 200 or more. Therefore, the water-soluble polymer in the present invention includes those having a molecular weight that is generally not recognized as a polymer. The preferred mass average molecular weight of the water-soluble polymer in the present invention is 200 or more and 70,000 or less, and more preferably 250 or more and 70,000 or less. When the mass average molecular weight is less than 200, the above-described effects cannot be sufficiently achieved. Such a mass average molecular weight can be measured, for example, by gel chromatography.

  Examples of the water-soluble polymer include polyalkylene glycol, polyvinyl alcohol, polyvinylamine, polyvinylpyrrolidone, polyethyleneimine, and polyacrylamide as synthetic polymers. Natural water-soluble polymers include agar, alginic acids (alginic acid, alginate), carrageenan, xanthan gum, native gellan gum, deacylated gellan gum, macrohomopsis gum, curdlan, pullulan, galactomannan (guar gum, locust Bean gum, tara gum, cassia gum, etc.), tamarind seed gum, psyllium seed gum, glucomannan, tragacanth gum, karaya gum, gum arabic, gati gum, pectin, water-soluble hemicellulose, soybean polysaccharide, methylcellulose (MC), hydroxypropylcellulose (HPC) Cellulose derivatives such as hydroxypropylmethylcellulose (HPMC), sodium carboxymethylcellulose (CMC), hydroxyethylcellulose (HEC), Starch, raw starch (raw starch), dextrin, and the like gelatin.

Among the water-soluble polymers described above, polyalkylene glycol is preferable because the molecular weight and water solubility can be easily controlled. Polyalkylene glycols having various structures can be used. For example, the compound shown by following formula (1) is mentioned.
_{^{R 1 - [(OR 2)}} m1 -OR 3] n1 (1)
(In the formula, R ¹ is a hydrogen atom, a hydrocarbyl group having 1 to 10 carbon atoms, an oxygen-containing hydrocarbyl group having 2 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, and a carbon number 1 having 2 to 6 bonding parts. R ² is an alkylene group having 2 to 4 carbon atoms, R ³ is a hydrogen atom, a hydrocarbyl group having 1 to 10 carbon atoms, an oxygen-containing hydrocarbyl group having 2 to 10 carbon atoms, and It is any of acyl groups having 2 to 10 carbon atoms, n1 is an integer of 1 to 6, and m1 is a number with an average value of m1 × n1 of 6 to 80.)

In the above formula (1), the hydrocarbyl group in R ¹ and R ³ may be linear, branched or cyclic. Specific examples of the hydrocarbyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, various butyl groups, various pentyl groups, various hexyl groups, various heptyl groups, various octyl groups, various nonyl groups, and various decyl groups. And alkyl groups such as a cyclopentyl group and a cyclohexyl group. When the number of carbon atoms in the hydrocarbyl group exceeds 10, the compatibility with the refrigerant is lowered, and phase separation may occur. A preferred hydrocarbyl group has 1 to 6 carbon atoms. Examples of the oxygen-containing hydrocarbyl group include a tetrahydrofurfuryl group.
Further, the alkyl group part of the acyl group in R ¹ and R ³ may be linear, branched or cyclic. As specific examples of the alkyl group portion of the acyl group, various groups having 1 to 9 carbon atoms exemplified as specific examples of the alkyl group can be exemplified.
When R ¹ and R ³ are both hydrocarbyl groups, oxygen-containing hydrocarbyl groups, or acyl groups, R ¹ and R ³ may be the same or different from each other.
Furthermore, when n1 is 2 or more, a plurality of R ^{3 in} one molecule may be the same or different.

When R ¹ is a hydrocarbyl group having 1 to 10 carbon atoms having 2 to 6 bonding sites, the hydrocarbyl group may be chain-like or cyclic. Examples of the hydrocarbyl group having two bonding sites include alkylene such as ethylene group, propylene group, butylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group, decylene group, cyclopentylene group, and cyclohexylene group. Groups. Examples of the hydrocarbyl group having 3 to 6 binding sites include trimethylolpropane, glycerin, pentaerythritol, sorbitol; 1,2,3-trihydroxycyclohexane; 1,3,5-trihydroxycyclohexane The residue which remove | excluded the hydroxyl group from alcohol can be mentioned.

R ² in the formula (1) is an alkylene group having 2 to 4 carbon atoms, and examples of the oxyalkylene group of the repeating unit include an oxyethylene group, an oxypropylene group, and an oxybutylene group. The oxyalkylene groups in one molecule may be the same or two or more oxyalkylene groups may be contained, but those containing at least an oxypropylene unit in one molecule are preferred, and in particular, oxyalkylene units. Those containing 50 mol% or more of oxypropylene units are preferred.
N1 in the formula (1) is an integer of 1 to 6, is determined in accordance with the number of binding sites of ^{R 1.} For example, when R ¹ is an alkyl group or an acyl group, n 1 is 1, and when R ¹ is an aliphatic hydrocarbon group having 2, 3, 4, 5 and 6 binding sites, n 1 is 2, 3 respectively. 4, 5 and 6. Moreover, m1 is a number from which the average value of m1 * n1 becomes 6-80.

The polyalkylene glycol represented by the formula (1) includes a polyalkylene glycol having a hydroxyl group at the terminal. Specific examples of the polyalkylene glycol include polypropylene glycol, polyethylene glycol, pentaerythritol ether of polyethylene glycol, and polyoxypropylene-polyoxyethylene copolymer. In the case of a copolymer composed of a polyoxypropylene (PO) unit and a polyoxyethylene (EO) unit, either a random polymer or a block polymer may be used.
Among the above-mentioned polyalkylene glycols, those having a mass average molecular weight of 200 or more among those known as nonionic (nonionic) surfactants can be suitably used.

  In this invention, it is preferable that the compounding quantity of the water-soluble polymer which is (C) component is 1-15 mass% on the basis of oil agent whole quantity, More preferably, it is 5-10 mass%. If the blending amount is less than 1% by mass, a friction reducing effect cannot be expected, which is not preferable. On the other hand, if the blending amount exceeds 15% by mass, an effect cannot be expected for the blending amount, which is not economical.

Component (D) is water for preparing the present oil agent (stock solution) and may be tap water, but it is preferable to use distilled water or ion-exchanged water. The ratio of water for preparing the stock solution is preferably 10 to 80% by mass. When the proportion of water is less than 10% by mass, it becomes difficult to dissolve the components (A) to (C), and the preparation of the stock solution becomes complicated. Moreover, when the ratio of the water for stock solution preparation exceeds 80 mass%, the storage amount and transport amount as stock solution will become excessive, and handling property will fall. Therefore, the amount of water in the stock solution is preferably 20 to 60% by mass.
In addition, the water-soluble metalworking fluid (stock solution) of the present invention is used by diluting 2 to 200 times (volume ratio), preferably 5 to 100 times with water.

The water-soluble metalworking fluid of the present invention may further contain an acidic phosphate ester or phosphite ester from the viewpoint of improving lubricity.
Examples of the acidic phosphate ester include 2-ethylhexyl acid phosphate, ethyl acid phosphate, butyl acid phosphate, oleyl acid phosphate, tetracosyl acid phosphate, isodecyl acid phosphate, lauryl acid phosphate, tridecyl acid phosphate, stearyl acid phosphate , Isostearyl acid phosphate and the like.

Examples of phosphites include triethyl phosphite, tributyl phosphite, triphenyl phosphite, tricresyl phosphite, tri (nonylphenyl) phosphite, tri (2-ethylhexyl) phosphite, tridecyl phosphite, tridecyl phosphite Examples thereof include lauryl phosphite, triisooctyl phosphite, diphenylisodecyl phosphite, tristearyl phosphite, and trioleyl phosphite.
These acidic phosphate esters and phosphite esters may be used alone or in combination with each other, but the total amount added to the oil is preferably about 1 to 15% by mass.

Further, the water-soluble metalworking fluid of the present invention can further contain a metal deactivator (corrosion-resistant agent), an antioxidant, an oily agent and an antifoaming agent as long as the object of the present invention is not impaired. .
Examples of the metal deactivator include benzotriazole, imidazoline, pyrimidine derivatives, thiadiazole, thiadiazole and the like. One of these may be used alone, or two or more may be used in combination. As for the compounding quantity to an oil agent, about 0.01-1 mass% is preferable on the basis of the total amount of an oil agent.

Conventionally known phenolic antioxidants and amine antioxidants can be used as the antioxidant.
Examples of phenolic antioxidants include 2,6-di-tert-butyl-4-methylphenol; 2,6-di-tert-butyl-4-ethylphenol; 2,4,6-tri-tert-butylphenol. 2,6-di-tert-butyl-4-hydroxymethylphenol; 2,6-di-tert-butylphenol; 2,4-dimethyl-6-tert-butylphenol; 2,6-di-tert-butyl-4 -(N, N-dimethylaminomethyl) phenol; 2,6-di-tert-amyl-4-methylphenol; n-octadecyl 3- (4-hydroxy-3,5-di-tert-butylphenyl) propionate Monocyclic phenols, 4,4′-methylenebis (2,6-di-tert-butylphenol); 4,4′-isopropyl Redenbis (2,6-di-tert-butylphenol); 2,2′-methylenebis (4-methyl-6-tert-butylphenol); 4,4′-bis (2,6-di-tert-butylphenol); 4 4,4′-bis (2-methyl-6-tert-butylphenol); 2,2′-methylenebis (4-ethyl-6-tert-butylphenol); 4,4′-butylidenebis (3-methyl-6-tert- Butylphenol); 2,2′-thiobis (4-methyl-6-tert-butylphenol); polycyclic phenols such as 4,4′-thiobis (3-methyl-6-tert-butylphenol).

Examples of amine-based antioxidants include diphenylamine-based compounds, specifically diphenylamine and monooctyldiphenylamine; monononyldiphenylamine; 4,4′-dibutyldiphenylamine; 4,4′-dihexyldiphenylamine; 4,4′-dioctyl. 4,4'-dinonyldiphenylamine;tetrabutyldiphenylamine;tetrahexyldiphenylamine; tetraoctyldiphenylamine: alkylated diphenylamine having a C3-C20 alkyl group such as tetranonyldiphenylamine, and the like, and naphthylamine-based ones Specifically, α-naphthylamine; phenyl-α-naphthylamine, further butylphenyl-α-naphthylamine; hexylphenyl-α-naphthylamine; octylphenyl α- naphthylamine; and alkyl-substituted phenyl -α- naphthylamine having 3 to 20 carbon atoms such as nonylphenyl -α- naphthylamine. Among these, the diphenylamine type is preferable to the naphthylamine type from the viewpoint of the effect, and in particular, an alkylated diphenylamine having an alkyl group having 3 to 20 carbon atoms, especially 4,4′-di (C _{3 to} C ₂₀ alkyl). Diphenylamine is preferred.
In this invention, 1 type (s) or 2 or more types chosen from the said phenolic antioxidant and amine antioxidant can be used as antioxidant. Moreover, the compounding quantity is about 0.01-5 mass% on the basis of composition whole quantity from surfaces, such as an antioxidant effect and economical balance.

  Examples of the oily agent include fatty alcohols, fatty acid compounds such as fatty acids and fatty acid metal salts, ester compounds such as polyol esters, sorbitan esters, and glycerides, and amine compounds such as aliphatic amines. Examples of the antifoaming agent include methyl silicone oil, fluorosilicone oil, and polyacrylate.

  As described above, the water-soluble metalworking fluid of the present invention is appropriately diluted in water so as to have an appropriate concentration according to the purpose of use, and includes punching, cutting, grinding, polishing, drawing, drawing, It can be suitably used in various metal processing fields such as rolling. And since the water-soluble metalworking fluid of the present invention is excellent in lubricity regardless of the dilution concentration, not only soft aluminum plates such as aluminum fin materials but also hard iron plates (such as S45C thin plates) such as carbon steel. Is also suitable. Furthermore, even if the surface of an aluminum fin material or the like is coated with a hydrophilic substance, the lubricity is not impaired.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
[Examples 1-2, Comparative Examples 1-3, Reference Example]
A water-soluble metalworking fluid (stock solution) was prepared according to the formulation shown in Table 1. Details of each component are as follows.

１）ポリアルキレングリコールＡ
（ＥＯ）_ｎ−（ＰＯ）_ｍ−（ＥＯ）_ｎで示されるブロック型共重合体を用いた。ここで、（ＥＯ）_ｎはエチレンオキサイドの重合体からなり、（ＰＯ）_ｍは、プロピレンオキサイドの重合体からなる。ｎは、約５であり、ｍは約３５である。なお、両末端基とも水酸基である。
２）ポリアルキレングリコールＢ （株式会社日本乳化剤社製 ＰＮＴ−４０）
ポリエチレングリコールペンタエリスリトールエーテルを用いた。

1) Polyalkylene glycol A
A block copolymer represented by (EO) _n- (PO) _m- (EO) _n was used. Here, (EO) _n is made of a polymer of ethylene oxide, and (PO) _m is made of a polymer of propylene oxide. n is about 5 and m is about 35. Both terminal groups are hydroxyl groups.
2) Polyalkylene glycol B (Nihon Emulsifier Co., Ltd. PNT-40)
Polyethylene glycol pentaerythritol ether was used.

The following characteristics were evaluated based on the stock solution of the above-described formulation. The evaluation results are shown in Table 1.
(1) Lubricity (coefficient of friction)
Except for the reference examples, the stock solution was diluted 50 times (volume ratio) with ion-exchanged water, then applied to the test piece, and the dynamic friction coefficient (μ) was determined by the reciprocating friction test shown below. As a reference example, a test using only ion-exchanged water was also performed.

<Reciprocating friction test>
Test machine: Reciprocating friction tester (Orientec Co., Ltd.)
Test piece: Pre-coated aluminum fin material for heat exchanger
(The surface is coated with polyethylene glycol as a hydrophilic film)
Test conditions:
Liquid temperature: 70 ° C
Load: 3kgf (29N)
Sliding speed: 20mm / s
Amplitude: 50 mm
Under this condition, the highest friction coefficient at the first sliding was read. In addition, a friction coefficient is an average value when measuring about three test pieces each in an Example, a comparative example, and a reference example.

(2) Stock solution stability Each component of the stock solution was placed in a beaker and mixed with stirring with a stirrer to obtain a uniform solution. After allowing the solution to stand overnight, the state of the solution in the beaker was visually observed, and the stock solution stability was evaluated according to the following criteria.
○: Dissolved.
Δ: dispersed (cloudy)
X: It has hardened.

(3) Diluent stability Each component of the stock solution was placed in a beaker and mixed with stirring with a stirrer to prepare a uniform solution (stock solution preparation). 98 mL of water was placed in a 100 mL graduated cylinder and then diluted by adding 2 mL of stock solution. After shaking the graduated cylinder three times, the solution was allowed to stand overnight. The state of the solution in the graduated cylinder was visually observed, and the diluent stability was evaluated according to the following criteria.
○: Dissolved.
Δ: dispersed (cloudy)

〔Evaluation results〕
From the results of Table 1, the metalworking fluid of the present invention uses a predetermined water-soluble metalworking fluid diluted with water, so that when applied to an aluminum fin material, the fin material surface has a hydrophilic film. Even if it does, it exhibits excellent lubricity. In addition, the water-soluble metalworking fluid of the present invention has no problem with the stock solution stability and the diluted solution stability after dilution with water.
On the other hand, the oil agents of Comparative Examples 1 to 3 lacking at least one of the component (A), the component (B), and the component (C), which are essential components in the present invention, are used after diluted with water. In addition, none of them can exhibit lubricity.

  The metalworking fluid of the present invention can be suitably used for forming metal plates such as aluminum and iron.

Claims (6)

The following (A) component, (B) component, (C) component, and (D) component;
A water-soluble metalworking fluid ing by blending at least one kind of acidic phosphoric acid esters and phosphorous acid esters,
(A) C8-C12 carboxylic acid (B) trialkanolamine (C) water-soluble polymer (D) water having a mass average molecular weight of 200 or more
The component (C) is a compound represented by the following formula (1),
^{_{R 1 - [(OR 2)}} m1 -OR 3] n1 (1)
(In the formula, R ¹ is a hydrogen atom, a hydrocarbyl group having 1 to 10 carbon atoms, an oxygen-containing hydrocarbyl group having 2 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, and a carbon number 1 having 2 to 6 bonding parts. R ² is an alkylene group having 2 to 4 carbon atoms, R ³ is a hydrogen atom, a hydrocarbyl group having 1 to 10 carbon atoms, an oxygen-containing hydrocarbyl group having 2 to 10 carbon atoms, and It is any of acyl groups having 2 to 10 carbon atoms, n1 is an integer of 1 to 6, and m1 is a number with an average value of m1 × n1 of 6 to 80.)
The blending amounts of the component (A), the component (B), and the component (C) are as follows based on the total amount of the water-soluble metalworking fluid.
A water-soluble metalworking fluid characterized by that.
(A) component: 20 mass% or more and 40 mass% or less
(B) component: 20 mass% or more and 40 mass% or less
(C) component: 1 mass% or more, 15 mass% or less In the water-soluble metalworking fluid according to claim 1,
Furthermore, a water-soluble metalworking fluid characterized by comprising a metal deactivator. In the water-soluble metalworking fluid according to claim 1 or 2,
A water-soluble metalworking fluid comprising the component (A), the component (B), the component (C), the component (D), and the acidic phosphate ester. (A) the following components, (B), (C), and component (D), a water-soluble metalworking fluid, characterized in that by blending the acidic phosphoric acid ester Oyo via phosphoric acid ester .
(A) Carboxylic acid having 8 to 12 carbon atoms
(B) Trialkanolamine
(C) Water-soluble polymer having a mass average molecular weight of 200 or more
(D) Water With respect to the water-soluble metalworking fluid according to any one of claims 1 to 4,
A metalworking fluid characterized by being diluted with water at a volume ratio of 2 to 200 times. The metalworking fluid according to claim 5 is used for aluminum processing.