阅读说明：本技术 防锈油组合物及其制造方法 (Rust preventive oil composition and method for producing same ) 是由 前川阳太 城田雄亮 于 2019-03-22 设计创作，主要内容包括：通过含有(A)闪点小于100℃的溶剂、(B)闪点为100℃以上、40℃运动粘度为7mm<Sup>2</Sup>/s以上且120mm<Sup>2</Sup>/s以下的基础油、以及(C)防锈剂,并且40℃运动粘度为0.5mm<Sup>2</Sup>/s以上且3.2mm<Sup>2</Sup>/s以下的防锈油组合物及其制造方法,能够提供兼具优异的防锈油膜的薄膜性和防锈性的防锈油组合物及其制造方法。(Comprises (A) a solvent having a flash point of less than 100 deg.C and (B) a solvent having a flash point of 100 deg.C or more and a kinematic viscosity of 7mm at 40 deg.C 2 120mm of more than s 2 A base oil of not more than s, and (C) a rust preventive, and has a kinematic viscosity at 40 ℃ of 0.5mm 2 More than s and 3.2mm 2 A rust preventive oil composition having both excellent film properties and rust preventive properties of a rust preventive oil film, and a method for producing the same.)

1. A rust preventive oil composition comprising:

(A) a solvent having a flash point of less than 100 ℃;

(B) flash point of more than 100 ℃ and kinematic viscosity of 7mm at 40 DEG C²120mm of more than s²A base oil of less than s; and

(C) a rust-proof agent, a corrosion inhibitor,

the kinematic viscosity at 40 ℃ of the antirust oil composition is 0.5mm²More than s and 3.2mm²The ratio of the water to the water is less than s.

2. The rust preventive oil composition according to claim 1, wherein the flash point of said component (A) is 70 ℃ or lower.

3. The rust preventive oil composition according to claim 1 or 2, wherein the component (A) is 1 or more selected from isoparaffins and light oils.

4. The rust preventive oil composition according to any one of claims 1 to 3, wherein the content of the component (A) is 70% by mass or more and 95% by mass or less based on the total amount of the rust preventive oil composition.

5. The rust preventive oil composition as claimed in any one of claims 1 to 4, wherein the flash point of said component (B) is 120 ℃ or higher.

6. The rust preventive oil composition as claimed in any one of claims 1 to 5, wherein the kinematic viscosity at 40 ℃ of the component (B) is 15mm²100mm of more than s²The ratio of the water to the water is less than s.

7. The rust preventive oil composition according to any one of claims 1 to 6, wherein the component (B) is a mineral oil.

8. The rust preventive oil composition according to any one of claims 1 to 7, wherein the content of the component (B) is 0.5% by mass or more and 10% by mass or less based on the total amount of the rust preventive oil composition.

9. The rust preventive oil composition as claimed in any one of claims 1 to 8, wherein the component (C) is a metal sulfonate.

10. The rust preventive oil composition according to any one of claims 1 to 9, wherein the content of the component (C) is 1% by mass or more and 20% by mass or less based on the total amount of the rust preventive oil composition.

11. The rust preventive oil composition as claimed in any one of claims 1 to 10, wherein the kinematic viscosity at 40 ℃ is 1.0mm²2.8mm of more than s²The ratio of the water to the water is less than s.

12. The rust preventive oil composition as claimed in any one of claims 1 to 11, which further comprises (D) an antioxidant.

13. The rust preventive oil composition as claimed in claim 12, wherein the antioxidant (D) is contained in an amount of 0.1% by mass or more and 3% by mass or less based on the total amount of the rust preventive oil composition.

14. A method for producing a rust preventive oil composition as described in any one of claims 1 to 13, wherein:

(A) a solvent having a flash point of less than 100 ℃;

(B) flash point of more than 100 ℃ and kinematic viscosity of 7mm at 40 DEG C²120mm of more than s²A base oil of less than s; and

(C) a rust inhibitor.

Technical Field

The present invention relates to a rust preventive oil composition and a method for producing the same.

Background

A metal material such as a steel sheet is processed into an intermediate product or a final molded product through a plurality of steps, and usually, a rust preventive oil is applied to prevent oxidation deterioration of the metal surface. In this case, the rust-preventive property is improved as the thickness of the rust-preventive oil film on the surface of the metal material is increased, but when the thickness of the rust-preventive oil film is increased, the rust-preventive oil is sticky and the cost is increased. On the other hand, when the rust preventive oil film is thinned, a portion not covered with the rust preventive oil film may be generated, and sufficient rust preventive properties may not be obtained. Therefore, for rust preventive oil, a performance of exhibiting excellent rust preventive properties even if the rust preventive oil film is thin is required.

Patent document 1 discloses a composition containing a specific base oil, a fatty acid ester, an overbased metal sulfonate, and a neutral metal sulfonate as a rust preventive oil composition which is used as a processing oil and which does not substantially contain barium related to environmental load.

Disclosure of Invention

Problems to be solved by the invention

The rust preventive oil composition disclosed in patent document 1, which is used as a processing oil, does not substantially contain barium, and is characterized by being excellent in degreasing properties and also excellent in rust prevention and lubricity compared with conventional rust preventive oil compositions. However, patent document 1 has not studied from the viewpoint of exhibiting excellent rust inhibitive performance even with such a thin rust inhibitive oil film, and there is room for further improvement in terms of both the thin film property and the rust inhibitive performance of the rust inhibitive oil film.

The present invention has been made in view of the above problems, and an object thereof is to provide a rust preventive oil composition having both excellent film formability of a rust preventive oil film and rust preventive properties, and a method for producing the same.

Means for solving the problems

The present inventors have conducted extensive studies and, as a result, have found that: the present inventors have completed the present invention by solving the above problems with a rust preventive oil composition which contains a specific solvent, a specific base oil and a rust preventive agent and has a kinematic viscosity at 40 ℃ adjusted to a specific range.

Namely, the present invention provides the following [1] and [2 ].

[1]A rust preventive oil composition comprising: (A) a solvent having a flash point of less than 100 ℃; (B) flash point of more than 100 ℃ and kinematic viscosity of 7mm at 40 DEG C²120mm of more than s²A base oil of less than s; and (C) a rust preventive agent, the rust preventive oil composition having a kinematic viscosity at 40 ℃ of 0.5mm²More than s and 3.2mm²The ratio of the water to the water is less than s.

[2]A method for producing a rust preventive oil composition, which comprises producing the above [1]The method for producing an anti-rust oil composition, wherein: (A) a solvent having a flash point of less than 100 ℃; (B) flash point of more than 100 ℃ and kinematic viscosity of 7mm at 40 DEG C²120mm of more than s²A base oil of less than s; and (C) a rust inhibitor.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a rust preventive oil composition having both excellent film properties and rust preventive properties of a rust preventive oil film and a method for producing the same can be provided.

Detailed Description

The present embodiment will be described below. In the present specification, the numerical values "at least", "below", "less than" and "more than" in relation to the description of the numerical range are numerical values that can be arbitrarily combined.

[ Rust preventive oil composition ]

The rust preventive oil composition of the embodiment contains:

(A) a solvent having a flash point of less than 100 ℃ (hereinafter also referred to as "(a) solvent");

(B) Flash point of more than 100 ℃ and kinematic viscosity of 7mm at 40 DEG C²120mm of more than s²A base oil of not more than s (hereinafter also referred to as "(B) base oil"); and

(C) a rust-proof agent, a corrosion inhibitor,

the kinematic viscosity at 40 ℃ of the antirust oil composition is 0.5mm²More than s and 3.2mm²The ratio of the water to the water is less than s.

< kinematic viscosity at 40 ℃ of Rust preventive oil composition >

The rust preventive oil composition of the embodiment has a kinematic viscosity at 40 ℃ of 0.5mm²More than s and 3.2mm²The ratio of the water to the water is less than s.

In the present specification, the kinematic viscosity at 40 ℃ is a value measured in accordance with JIS K2283: 2000.

The rust preventive oil composition of the embodiment has a kinematic viscosity at 40 ℃ of 0.5mm²A length of 1.0mm or more, preferably²A thickness of 1.2mm or more, more preferably 1.s²A thickness of 1.4mm or more, particularly 1.s²More than s. On the other hand, the rust preventive oil composition of the embodiment has a kinematic viscosity at 40 ℃ of 3.2mm²Less than s, preferably 2.8mm²Less than s, more preferably 2.5mm²Less than s, particularly preferably 2.2mm²The ratio of the water to the water is less than s.

When the kinematic viscosity at 40 ℃ of the rust preventive oil composition of the present embodiment is not less than the above-described lower limit value, excessive run-off of the rust preventive component during oil control after application of oil can be prevented, and a rust preventive oil film sufficient for exhibiting excellent rust preventive properties can be formed even with a small amount of the base oil and the rust preventive agent. Further, when the kinematic viscosity at 40 ℃ of the rust preventive oil composition of the present embodiment is not more than the above upper limit, a rust preventive oil film having excellent film formability can be formed.

On the other hand, if the kinematic viscosity at 40 ℃ of the rust preventive oil composition is less than 0.5mm²In the oil control process, the rust preventive component may excessively flow off, and a rust preventive oil film sufficient for exhibiting excellent rust preventive properties may not be formed. Further, if the kinematic viscosity at 40 ℃ of the rust preventive oil composition exceeds 3.2mm²When the rust preventive oil film is too thick/s, the rust preventive oil film may be sticky and the cost may be increased.

Hereinafter, each component contained in the rust preventive oil composition of the present embodiment will be described.

< solvent (A) >

The rust preventive oil composition of the present embodiment contains (A) a solvent having a flash point of less than 100 ℃.

(A) The solvent plays a role in diluting the base oil and the rust inhibitor contained in the rust preventive oil composition, so that the rust preventive oil composition can be coated easily and a uniform rust preventive oil film is formed. (A) The solvent is dried and removed after the application of the rust preventive oil composition, and a rust preventive oil film mainly comprising a base oil and a rust preventive is formed on the surface of the metal material.

In the present specification, the flash point is a value measured according to the method described in JIS K2265: 2007.

(A) The flash point of the solvent is less than 100 ℃, preferably 90 ℃ or less, more preferably 80 ℃ or less, further preferably 70 ℃ or less, and particularly preferably 50 ℃ or less. On the other hand, the flash point of the solvent (A) is preferably 30 ℃ or higher, more preferably 35 ℃ or higher, and particularly preferably 40 ℃ or higher.

If the flash point of the solvent (a) is less than 100 ℃, the quick-drying property is excellent, and therefore, excessive run-off of the rust-preventive component during oil control can be prevented, and a rust-preventive oil film sufficient for exhibiting excellent rust-preventive properties can be formed even with a small amount of the base oil and the rust inhibitor. When the flash point of the solvent (a) is not lower than the lower limit, the volatility of the solvent (a) is not too high, and a rust preventive oil film having a uniform film thickness can be formed. Further, when the flash point of the solvent (A) is not more than the above upper limit, a rust preventive oil composition having more excellent quick-drying properties can be obtained, and excellent workability can be obtained.

On the other hand, if the flash point of the solvent (a) is 100 ℃ or higher, the drying rate becomes slow, and therefore, in the oil-controlling process, the rust-preventive component may excessively flow off, and a rust-preventive oil film sufficient for exhibiting excellent rust-preventive properties may not be formed.

Specific examples of the solvent (A) include hydrocarbons such as paraxylene (flash point: 27 ℃), orthoxylene (flash point: 33 ℃), metaxylene (flash point: 28 ℃), styrene (flash point: 32 ℃), ethylbenzene (flash point: 25 ℃), butene oligomer (flash point: 49 ℃), isoparaffin having a flash point of less than 100 ℃, and gas oil having a flash point of less than 100 ℃; alcohols such as 1-propanol (flash point: 25 ℃), isobutanol (flash point: 30 ℃), 1-butanol (flash point: 37 ℃), and 2-butanol (flash point: 21 ℃); isobutyl acetate (flash point 20 ℃), butyl acetate (flash point 24 ℃), amyl acetate (flash point 32 ℃), and other acetates; diisobutyl ketone (flash point 50 ℃), cyclohexanone (flash point 42 ℃), 4-hydroxy-4-methyl-2-pentanone (flash point 58 ℃), and other ketones; cellosolves such as ethylene glycol monomethyl ether (flash point: 41 ℃), ethylene glycol monoethyl ether (flash point: 43 ℃), ethylene glycol mono-n-butyl ether (flash point: 64 ℃), ethylene glycol monopropyl ether (71 ℃), ethylene glycol mono-tert-butyl ether (flash point: 55 ℃), 2-methoxymethyl acetate (flash point: 52 ℃), and 2-ethoxyethyl acetate (flash point: 57 ℃); glycol esters such as 3-methoxy-3-methylbutanol (flash point: 67 ℃), 3-methoxy-3-methylbutyl acetate (flash point: 75.5 ℃), 1-methoxy-2-propanol (flash point: 32 ℃), 1-methoxypropyl-2-acetate (flash point: 47 ℃), 1-ethoxy-2-propanol (flash point: 39 ℃), propylene glycol monopropyl ether (flash point: 48.5 ℃), 3-methoxybutyl acetate (flash point: 62.5 ℃), ethyl 3-ethoxypropionate (flash point: 59 ℃), propylene glycol monomethyl ether propionate (flash point: 56 ℃); ethyl lactate (flash point 46 ℃ C.), etc. Among these, from the viewpoint of economy and handleability, hydrocarbons are preferable, and 1 or more selected from isoparaffins and gas oils are more preferable.

The flash point in parentheses for the solvent (a) as a polymer, a mixture, or the like is a representative value thereof.

(A) The solvent may be used alone or in combination of two or more.

The isoparaffin is not particularly limited as long as it has a flash point of less than 100 ℃. The isoparaffin has preferably 6 or more carbon atoms, more preferably 8 or more carbon atoms, and particularly preferably 10 or more carbon atoms. On the other hand, the number of carbon atoms of the isoparaffin is preferably 36 or less, more preferably 28 or less, further preferably 20 or less, further preferably 16 or less, and particularly preferably 12 or less.

The content of the solvent (A) in the rust preventive oil composition of the present embodiment is preferably 70% by mass or more, more preferably 75% by mass or more, and particularly preferably 80% by mass or more, based on the total amount of the rust preventive oil composition. On the other hand, the content of the solvent (A) is preferably 95% by mass or less, more preferably 93% by mass or less, and particularly preferably 91% by mass or less, based on the total amount of the rust preventive oil composition.

When the content of the solvent (a) is not less than the lower limit, the concentration of the rust preventive component becomes appropriate, and a rust preventive oil film having excellent film formability can be formed. On the other hand, when the content of the solvent (a) is not more than the upper limit, the concentration of the rust-preventive component does not become too low, and a rust-preventive oil film sufficient for exhibiting excellent rust-preventive properties can be formed.

< B base oil >

The base oil (B) contained in the rust preventive oil composition of the embodiment has a flash point of 100 ℃ or higher and a kinematic viscosity at 40 ℃ of 7mm²120mm of more than s²The ratio of the water to the water is less than s.

(B) The base oil is retained on the surface of the metal material after the application of the rust preventive oil composition, and forms a rust preventive oil film together with the rust preventive (C).

(B) The base oil has a flash point of 100 ℃ or higher, preferably 120 ℃ or higher, more preferably 170 ℃ or higher, and particularly preferably 200 ℃ or higher. On the other hand, the flash point of the base oil (B) is preferably 300 ℃ or lower, more preferably 250 ℃ or lower, and particularly preferably 220 ℃ or lower.

When the flash point of the base oil (B) is 100 ℃ or higher, the volatility of the base oil (B) is suppressed, and the long-term rust prevention property is excellent. Further, when the flash point of the base oil (B) is not higher than the upper limit value, the handling property of the base oil (B) becomes excellent.

On the other hand, if the flash point of the base oil (B) is less than 100 ℃, the volatility of the base oil (B) may become too high, and the deterioration of rust inhibitive performance may be accelerated.

(B) The kinematic viscosity at 40 ℃ of the base oil is 7mm²A length of 15mm or more, preferably²More preferably 20 mm/s or more²More than s, particularly preferably 25mm ²More than s. In another aspect of (B) a base oilKinematic viscosity at 40 ℃ of 120mm²Less than s, preferably 100mm²Less than s, more preferably 80mm²(ii) less than s, more preferably 60mm²Less than s, particularly preferably 35mm²The ratio of the water to the water is less than s.

When the kinematic viscosity at 40 ℃ of the base oil (B) is not less than the lower limit, a rust preventive oil film sufficient for exhibiting excellent rust preventive properties can be formed. When the kinematic viscosity at 40 ℃ of the base oil (B) is not more than the upper limit, a rust preventive oil film having a uniform film thickness can be formed.

On the other hand, if the kinematic viscosity at 40 ℃ of the base oil (B) is less than 7mm²In the case of (B), the viscosity of the base oil becomes too low, and a rust preventive oil film sufficient for exhibiting excellent rust preventive properties may not be formed. In addition, if the kinematic viscosity at 40 ℃ of the base oil (B) exceeds 120mm²In the case of the oil composition (B), the viscosity of the base oil (B) becomes too high, and a rust-preventive oil film does not form normally.

(B) The base oil is not particularly limited as long as it satisfies the above flash point and kinematic viscosity at 40 ℃, and mineral oil, synthetic oil, or the like can be used.

Examples of the mineral oil include residual oils obtained by atmospheric distillation of paraffinic, intermediate or naphthenic crude oils; or a distillate oil obtained by vacuum distillation of an atmospheric distillation residue; further, examples of the refined oils obtained by refining them according to a conventional method include solvent refined oils, hydrogenated refined oils, dewaxed oils, clay-treated oils and the like. As the mineral oil, a mineral oil (GTL) obtained by isomerizing a wax (gtlwax (gas To Liquids wax)) produced from a natural gas by a fischer-tropsch process or the like can be used.

Examples of the synthetic oil include poly- α -olefin, α -olefin copolymer, polybutene, alkylbenzene, polyol ester, dibasic acid ester, polyoxyalkylene glycol ester, polyoxyalkylene glycol ether, hindered ester, silicone oil, and the like.

(B) The base oil may be used alone or in combination of two or more.

The content of the base oil (B) in the rust preventive oil composition of the present embodiment is preferably 0.5% by mass or more, more preferably 1% by mass or more, and particularly preferably 2% by mass or more, based on the total amount of the rust preventive oil composition. On the other hand, the content of the (B) base oil is preferably 10% by mass or less, more preferably 8% by mass or less, and particularly preferably 6% by mass or less, based on the total amount of the rust preventive oil composition.

When the content of the base oil (B) is not less than the lower limit, a rust preventive oil film sufficient for exhibiting excellent rust preventive properties can be formed. On the other hand, if the content of the base oil (B) is not more than the above upper limit, a rust preventive oil film having excellent film properties can be formed.

The rust preventive oil composition of the present embodiment can contain a kinematic viscosity at 40 ℃ of more than 120mm within a range not departing from the object of the invention²The base oil/s is preferably not contained from the viewpoint of forming a rust-preventive oil film having a uniform film thickness.

The rust preventive oil composition of the present embodiment comprises a rust preventive oil having a viscosity exceeding 120mm²The base oil having a kinematic viscosity at 40 ℃ per second is preferably contained in an amount of 8% by mass or less, more preferably 4% by mass or less, and particularly preferably 1% by mass or less, based on the total amount of the rust preventive oil composition.

Further, the rust preventive oil composition of the present embodiment can contain a kinematic viscosity at 40 ℃ of less than 7mm within a range not prejudicial to the object of the invention²The base oil/s is preferably not contained from the viewpoint of forming a sufficient rust-preventive oil film.

The rust preventive oil composition of the present embodiment comprises a composition having a viscosity of less than 7mm²The base oil having a kinematic viscosity at 40 ℃ per second is preferably contained in an amount of 8% by mass or less, more preferably 4% by mass or less, and particularly preferably 1% by mass or less, based on the total amount of the rust preventive oil composition.

[ anti-rust agent (C) ]

Examples of the rust inhibitor (C) include metal sulfonates, alkylbenzene sulfonates, dinonylnaphthalene sulfonates, organic phosphites, organic phosphates, metal salts of organic sulfonates, metal salts of organic phosphates, alkenyl succinates, polyol esters, and benzotriazole compounds. Among these, metal sulfonates are preferred from the viewpoint of solubility and rust prevention. Here, the metal sulfonate refers to a metal salt of various sulfonic acids.

Examples of the sulfonic acid constituting the metal sulfonate include aromatic petroleum sulfonic acid, alkyl sulfonic acid, aryl sulfonic acid, and alkylaryl sulfonic acid, and more specifically, dodecyl benzene sulfonic acid, dilauryl cetyl benzene sulfonic acid, paraffin wax-substituted benzene sulfonic acid, polyolefin-substituted benzene sulfonic acid, polyisobutylene-substituted benzene sulfonic acid, and naphthalene sulfonic acid.

Examples of the metal constituting the metal sulfonate include sodium, magnesium, calcium, zinc, and the like, and among these, calcium is preferable from the viewpoint of rust prevention and acquisition easiness.

Examples of the metal sulfonate include an overbased metal sulfonate and a neutral metal sulfonate, and from the viewpoint of rust prevention and acquisition easiness, an overbased calcium sulfonate and a neutral calcium sulfonate are preferable.

(C) The rust inhibitor may be used singly or in combination of two or more, and preferably, an overbased metal sulfonate and a neutral metal sulfonate are used in combination. By using the overbased metal sulfonate and the neutral metal sulfonate in combination, a synergistic effect of exerting excellent rust inhibitive performance can be obtained as compared with the case of using only one.

(overbased metal sulfonates)

The alkali number of the overbased metal sulfonate is preferably 300mgKOH/g or more, more preferably 400mgKOH/g or more, and particularly preferably 500mgKOH/g or more. On the other hand, the base number of the overbased metal sulfonate is preferably 700mgKOH/g or less, more preferably 600mgKOH/g or less, and particularly preferably 550mgKOH/g or less.

In the present specification, the base number is a value measured according to the method described in JIS K2501: 2003.

When the base number of the overbased metal sulfonate is not less than the above-described lower limit, the acid neutralizing ability of the rust preventive oil film is sufficiently ensured. On the other hand, if the base number of the overbased metal sulfonate is not more than the above upper limit, it is easy to obtain it, and an increase in cost can be suppressed.

The content of the overbased metal sulfonate in the rust preventive oil composition of the present embodiment is preferably 0.5% by mass or more, more preferably 1% by mass or more, and particularly preferably 1.5% by mass or more, based on the total amount of the rust preventive oil composition. On the other hand, the content of the overbased calcium sulfonate is preferably 10% by mass or less, more preferably 7% by mass or less, and particularly preferably 4% by mass or less, based on the total amount of the rust preventive oil composition.

When the content of the overbased metal sulfonate is not less than the above lower limit, sufficient rust prevention can be obtained. On the other hand, when the content of the overbased metal sulfonate is not more than the above upper limit, the amount of the overbased metal sulfonate to be used can be suppressed and a sufficient effect can be exerted.

(neutral Metal sulfonate)

From the viewpoint of rust prevention, the total base number of the neutral metal sulfonate is preferably 0mgKOH/g or more, more preferably 5mgKOH/g or more, and particularly preferably 10mgKOH/g or more. On the other hand, from the viewpoint of obtaining excellent rust prevention when combined with an overbased metal sulfonate, the total base number of the neutral metal sulfonate is preferably 200mgKOH/g or less, more preferably 100mgKOH/g or less, and particularly preferably 30mgKOH/g or less.

The content of the neutral metal sulfonate in the rust preventive oil composition of the present embodiment is preferably 0.5% by mass or more, more preferably 1% by mass or more, and particularly preferably 1.5% by mass or more, based on the total amount of the rust preventive oil composition. On the other hand, the content of the neutral metal sulfonate is preferably 10% by mass or less, more preferably 7% by mass or less, and particularly preferably 4% by mass or less, based on the total amount of the rust preventive oil composition.

When the content of the neutral metal sulfonate is not less than the lower limit, sufficient rust prevention can be obtained. On the other hand, if the content of the neutral metal sulfonate is not more than the above upper limit, the amount of the neutral metal sulfonate to be used can be suppressed and a sufficient effect can be exerted.

When the rust preventive oil composition of the present embodiment contains the overbased metal sulfonate and the neutral metal sulfonate, the content ratio of the overbased metal sulfonate to the neutral metal sulfonate (overbased metal sulfonate/neutral metal sulfonate) is preferably 0.25 or more, more preferably 0.5 or more, and particularly preferably 0.8 or more on a mass basis from the viewpoint of rust prevention. On the other hand, from the viewpoint of rust prevention, the content ratio (overbased metal sulfonate/neutral metal sulfonate) is preferably 4 or less, more preferably 2 or less, and particularly preferably 1.25 or less on a mass basis.

The content of the rust inhibitor (C) in the rust preventive oil composition of the present embodiment is preferably 1% by mass or more, more preferably 2% by mass or more, and particularly preferably 3% by mass or more, based on the total amount of the rust preventive oil composition. On the other hand, the content of the (C) rust inhibitor is preferably 20% by mass or less, more preferably 14% by mass or less, and particularly preferably 8% by mass or less, based on the total amount of the rust preventive oil composition.

When the content of the (C) rust inhibitor is not less than the lower limit, sufficient rust inhibition can be obtained. On the other hand, if the content of the (C) rust inhibitor is not more than the above upper limit, the amount of the (C) rust inhibitor to be used can be suppressed and a sufficient effect can be exhibited.

The rust preventive oil composition of the present embodiment preferably contains 1 or more selected from (D) an antioxidant, (E) a metal deactivator, and (F) a fatty acid ester of a polyhydric alcohol, as necessary.

[ antioxidant (D) ]

As the antioxidant (D), a phenol-based antioxidant, an amine-based antioxidant and the like are exemplified, and among these, a phenol-based antioxidant is preferable from the viewpoint of oxidation stability.

Examples of the phenol-based antioxidant include monocyclic phenol-based compounds such as 2, 6-di-t-butyl-4-methylphenol, 2, 6-di-t-butyl-4-ethylphenol, 2,4, 6-tri-t-butylphenol, 2, 6-di-t-butyl-4-hydroxymethylphenol, 2, 6-di-t-butylphenol, 2, 4-dimethyl-6-t-butylphenol, 2, 6-di-t-butyl-4- (N, N-dimethylaminomethyl) phenol, 2, 6-di-t-pentyl-4-methylphenol, and N-octadecyl 3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate; polycyclic phenol compounds such as 4,4 ' -methylenebis (2, 6-di-tert-butylphenol), 4 ' -isopropylidenebis (2, 6-di-tert-butylphenol), 2 ' -methylenebis (4-methyl-6-tert-butylphenol), 4 ' -bis (2, 6-di-tert-butylphenol), 4 ' -bis (2-methyl-6-tert-butylphenol), 2 ' -methylenebis (4-ethyl-6-tert-butylphenol), and 4,4 ' -butylidenebis (3-methyl-6-tert-butylphenol). Among these, from the viewpoint of oxidation stability, a monocyclic phenol compound is preferable, and octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate is more preferable.

(D) The antioxidant may be used alone or in combination of 1.

The content of the antioxidant (D) in the rust preventive oil composition of the present embodiment is preferably 0.1% by mass or more, more preferably 0.15% by mass or more, and particularly preferably 0.2% by mass or more, based on the total amount of the rust preventive oil composition. On the other hand, the content of the antioxidant (D) is preferably 3% by mass or less, more preferably 1% by mass or less, and particularly preferably 0.5% by mass or less, based on the total amount of the rust preventive oil composition.

When the content of the antioxidant (D) is not less than the lower limit, sufficient oxidation stability can be obtained. On the other hand, if the content of the antioxidant (D) is not more than the above upper limit, the amount of the antioxidant can be suppressed and a sufficient effect can be exhibited.

< E) Metal passivator >

The metal deactivator (E) includes benzotriazole compounds, thiadiazole compounds, alkenyl succinic acid esters and derivatives thereof, and among these, benzotriazole compounds are preferable from the viewpoint of preventing discoloration.

Examples of the benzotriazole-based compound include 1,2, 3-benzotriazole, methylbenzotriazole, and 1- [ N, N-bis (2-ethylhexyl) aminomethyl ] methylbenzotriazole, and among these, 1- [ N, N-bis (2-ethylhexyl) aminomethyl ] methylbenzotriazole is preferable.

(E) The metal deactivators may be used singly or in combination of two or more.

The content of the metal deactivator (E) in the rust preventive oil composition of the present embodiment is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, and particularly preferably 0.05% by mass or more, based on the total amount of the rust preventive oil composition. On the other hand, the content of the (E) metal deactivator is preferably 3% by mass or less, more preferably 1% by mass or less, particularly preferably 0.3% by mass or less, based on the total amount of the rust preventive oil composition.

When the content of the (E) metal deactivator is not less than the lower limit, a sufficient metal deactivation effect can be obtained. On the other hand, when the content of the metal deactivator (E) is not more than the upper limit, the amount of use can be suppressed and a sufficient effect can be exhibited.

< polyol ester of monocarboxylic acid (F) >

(F) The polyol ester of a monocarboxylic acid may be a full ester in which all of the hydroxyl groups in the polyol have been esterified, a partial ester in which a part of the hydroxyl groups in the polyol have not been esterified, or a mixture of a partial ester and a full ester, and is preferably a full ester.

The number of carbon atoms of the polyol constituting the component (F) is preferably 3 or more, more preferably 4 or more, and particularly preferably 5 or more. On the other hand, the number of carbon atoms of the polyol is preferably 15 or less, more preferably 10 or less, and particularly preferably 8 or less.

When the number of carbon atoms of the polyhydric alcohol is not less than the lower limit, the polyhydric alcohol easily functions as a film forming component in the rust-preventive oil film. On the other hand, when the number of carbon atoms of the polyol is not more than the above upper limit, the polyol is excellent in solubility with other components.

The polyhydric alcohol may be linear, branched, or cyclic, and may be saturated or unsaturated.

Examples of the polyhydric alcohol include dihydric alcohols such as ethylene glycol, propylene glycol, propane diol, butanediol, butane diol, 2-methyl-1, 3-propane diol, pentane diol, neopentyl glycol, hexane diol, 2-ethyl-2-methyl-1, 3-propane diol, heptane diol, 2-methyl-2-propyl-1, 3-propane diol, 2-diethyl-1, 3-propane diol, octane diol, nonane diol, decane diol, undecane diol, dodecane diol, tridecane diol, tetradecane diol, and pentadecane diol; polyhydric aliphatic alcohols such as trihydric or higher alcohols such as trimethylolethane, bis (trimethylolethane), trimethylolpropane, bis (trimethylolpropane), glycerol, pentaerythritol, dipentaerythritol, tripentaerythritol and sorbitol. Among these, from the viewpoint of ease of developing a film forming function in a rust-preventive oil film and solubility in other components, a ternary or higher aliphatic alcohol is preferable, and pentaerythritol and sorbitol are more preferable.

The monocarboxylic acid constituting the component (F) has preferably 9 or more carbon atoms, more preferably 12 or more carbon atoms, and particularly preferably 14 or more carbon atoms. On the other hand, the carbon number of the monocarboxylic acid is preferably 21 or less, more preferably 20 or less, and particularly preferably 18 or less. If the carbon number of the monocarboxylic acid is not less than the lower limit, the monocarboxylic acid easily functions as a film forming component in the rust-preventive oil film. On the other hand, when the carbon number of the monocarboxylic acid is not more than the above upper limit, the monocarboxylic acid is excellent in solubility with other components.

The monocarboxylic acid may be linear, branched or cyclic, or may be saturated or unsaturated.

Specific examples of the monocarboxylic acid include saturated monocarboxylic acids such as nonanoic acid, capric acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, heptadecanoic acid, decanoic acid, isodecanoic acid, nonadecanoic acid, arachidic acid, and heneicosanoic acid; aliphatic monocarboxylic acids such as monounsaturated carboxylic acids including myristoleic acid, palmitoleic acid, hexadecenoic acid, oleic acid, linoleic acid, linolenic acid, gadoleic acid, and eicosenoic acid; alicyclic monocarboxylic acids such as ethylcyclohexanecarboxylic acid, propylcyclohexanecarboxylic acid, butylcyclohexanecarboxylic acid, phenylcyclopentanecarboxylic acid, and phenylcyclohexanecarboxylic acid; and monoaromatic carboxylic acids such as biphenylcarboxylic acid, benzoylbenzoic acid, naphthoic acid and anthracenecarboxylic acid. Among these, from the viewpoint of processability and solubility in other components, monounsaturated carboxylic acids such as oleic acid, linoleic acid, and linolenic acid are preferable, and oleic acid is more preferable.

Specific examples of the polyhydric alcohol ester of a monocarboxylic acid (F) include pentaerythritol esters such as pentaerythritol monooleate, pentaerythritol dioleate, pentaerythritol trioleate, pentaerythritol tetraoleate, various pentaerythritol oleates, various pentaerythritol stearates, various pentaerythritol laurates, various pentaerythritol myristates, and various pentaerythritol palmitates; esters of trimethylolpropane as a polyhydric alcohol such as trimethylolpropane monooleate, trimethylolpropane dioleate, trimethylolpropane trioleate and the like, trimethylolpropane laurate and the like, trimethylolpropane myristate and the like and trimethylolpropane palmitate and the like; the polyhydric alcohol such as sorbitan sesquioleate is an ester of sorbitol. Among these, various pentaerythritol oleate, various trimethylolpropane oleate, and sorbitan sesquioleate are preferable from the viewpoint of processability.

(F) The polyol ester of a monocarboxylic acid may be used in 1 kind alone or in combination.

The content of the polyol ester of a monocarboxylic acid (F) in the rust preventive oil composition of the present embodiment is preferably 0.5% by mass or more, more preferably 1% by mass or more, and particularly preferably 2% by mass or more, based on the total amount of the rust preventive oil composition. On the other hand, the content of the (F) polyol ester of a monocarboxylic acid is preferably 15% by mass or less, more preferably 10% by mass or less, and particularly preferably 7% by mass or less, based on the total amount of the rust preventive oil composition.

When the content of the polyol ester of monocarboxylic acid (F) is not less than the lower limit, the film-forming component functions. On the other hand, when the content of the polyol ester of monocarboxylic acid (F) is not more than the above upper limit, a rust preventive oil film having little stickiness can be formed.

< other additives >

The rust preventive oil composition of the present embodiment may contain other additives such as an antifoaming agent, a viscosity index improver, and the like in addition to the components (a) to (F) within a range not to impair the object of the present invention.

The rust preventive oil composition of the present embodiment may contain only the components (a) to (C), or may contain 1 or more selected from the components (D) to (F), and no other additive.

The total content of the components (a) to (C) in the rust preventive oil composition of the present embodiment is preferably 80% by mass or more, more preferably 90% by mass or more, and particularly preferably 93% by mass or more, based on the total weight of the rust preventive oil composition. The total content is preferably 99% by mass or less, more preferably 98% by mass or less, and particularly preferably 97% by mass or less, based on the total amount of the rust preventive oil composition. The total content of the components (a) to (F) in the rust preventive oil composition of the present embodiment is preferably 90 mass% or more, more preferably 95 mass% or more, and particularly preferably 99 mass% or more, based on the total weight of the rust preventive oil composition.

< content of barium >

The rust preventive oil composition of the present embodiment is preferably substantially free of barium. Here, "substantially free" means that barium is not actively added, and does not mean that barium, which is a trace impurity, is positively removed.

When the rust preventive oil composition of the present embodiment contains barium, the content thereof is preferably 5 mass ppm or less, more preferably 3 mass ppm or less, and particularly preferably 1 mass ppm or less, based on the total amount of the rust preventive oil composition.

If the rust preventive oil composition of the present embodiment contains substantially no barium or has a barium content of not more than the above upper limit, the burden on the environment can be reduced.

< method for producing Rust preventive oil composition >

The rust preventive oil composition of the present embodiment can be produced by mixing (A) a solvent having a flash point of less than 100 ℃ and (B) a solvent having a flash point of 100 ℃ or higher and a kinematic viscosity of 7mm at 40 ℃²120mm of more than s²A base oil having a viscosity of not more than s and (C) a rust preventive agent. In this case, 1 or more selected from the components (D) to (F) and/or other additives may be blended as necessary.

< use of Rust preventive oil composition >

As described above, the rust preventive oil composition of the present embodiment has both excellent film formability of a rust preventive oil film and excellent rust preventive properties, and further has excellent quick-drying properties and low odor properties, and therefore has excellent workability. Therefore, the rust preventive oil composition of the present embodiment is suitable for use in metal materials such as steel sheets, particularly metal materials for automobiles, and more particularly metal materials for torque converters. That is, according to the present invention, there can be provided a method for rust prevention of a metal material using the rust preventive oil composition of the present embodiment, and a method for rust prevention of a metal material for a torque converter using the rust preventive oil composition of the present embodiment.