JPH10298580A - Metal-rolling oil composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil composition for metal rolling that has excellent circulation stability of O/W type emulsion and adhesion properties. SOLUTION: This composition comprises (a) 60-99.8 wt.% of one or two or more kinds of lubricant components selected from mineral oil, fat and oil and fatty acid ester, (b) 0.1-39.9 wt.% of a copolymer containing a polyoxyalkylene derivative shown by the formula: R<1> -O-(AO)n -R<2> (AO is an oxyalkylene group of 2-18 carbon atoms, R<1> is a hydrocarbon group bearing a polymerizable double bond and 2-5 carbon atoms or an acyl group bearing this hydrocarbon group, R<2> is H, a hydrocarbon group or an acyl group of 1-40 carbon atoms, (n) is 1-1,000).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel metal rolling oil composition, and more particularly to a metal rolling oil composition used as an O / W emulsion supplied to a rolling section.

[0002]

2. Description of the Related Art Metal rolling oils conventionally used are:
Lubricating oil components such as mineral oils, fats and fatty acid esters, and lubricating oil assistants such as an oiliness improver, an extreme pressure agent, a rust preventive, and an antioxidant are added. It is supplied to the rolling section at a concentration of ２０20% by weight for use. However, the rapid progress of rolling equipment and technology in recent years has led to higher speeds of rolling and mass production.The lubricating properties, the cleanliness of the metal plate surface, the stability during circulating use, the workability, etc. Demands for rolling oils are becoming increasingly sophisticated, and there is a demand for the development of metal rolling oils that meet those requirements.

[0003] However, conventional metal rolling oils using an emulsifier have various problems, and in particular, the adhesion to the surface of the rolled material and the circulation stability when the O / W emulsion is used in circulation are contradictory. There was a problem. In other words, when trying to improve the circulation stability by adjusting the type and amount of the emulsifier, the amount of oil adhering to the rolled material surface of the metal rolling oil decreases and lubricity becomes insufficient, and conversely, the amount of adhering oil is increased. Then, it is necessary to adjust the emulsifier, and there is a problem that circulation stability is reduced. In order to solve these problems, JP-A-1-163297 discloses a copolymer of a polyoxyalkylene derivative and maleic anhydride, and JP-A-3-81397 discloses a salt of an ethylene oxide adduct of an amino compound. Is disclosed, but it was difficult to satisfy adhesion and circulation stability in a well-balanced manner.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a metal rolling oil composition having excellent circulation stability and adhesion of an O / W emulsion.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to overcome the above problems, and as a result, have found that a copolymer composed of a specific monomer and an alkylene oxide The present inventors have found that by combining an adduct, both circulation stability and adhesion are excellent, and have completed the present invention.

That is, the present invention relates to (a) mineral oils, fats and oils,
One or more lubricating oil components selected from fatty acid esters, (b) a copolymer containing a polyoxyalkylene derivative represented by the following general formula [1] and maleic acid as essential monomers, and (c) A) a metal rolling oil composition containing an alkylene oxide adduct of an amine compound having 8 to 40 carbon atoms; R ¹ —O— (AO) _n —R ² ... [1] (where AO is an oxyalkylene group having 2 to 18 carbon atoms, and R ¹ is a carbon atom having 2 to 5 carbon atoms having a polymerizable double bond. A hydrogen group or an acyl group having this hydrocarbon group, R ²
Represents a hydrogen atom, a hydrocarbon group having 1 to 40 carbon atoms or an acyl group, and n = 1 to 1000. )

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The lubricating oil component (a) includes, for example, cylinder oil, spindle oil, machine oil,
Mineral oils such as turbine oils; animal and vegetable oils such as beef tallow, lard, soybean oil, rapeseed oil, castor oil, nuka oil, coconut oil, and palm oil; fatty acids or synthetic fatty acids obtained from these animal and vegetable oils and 1 to 1 carbon atoms And 30 esters with an aliphatic alcohol.

The aliphatic alcohols include monohydric alcohols such as methanol, ethanol, propanol, butanol, octanol, lauryl alcohol, stearyl alcohol, behenyl alcohol and oleyl alcohol; ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol and glycerin. , Diglycerin, polyglycerin, trimethylolpropane, ditrimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol, polyhydric alcohols such as sorbitan, and the like.

The copolymer of the component (b) is a copolymer containing a polyoxyalkylene derivative represented by the general formula [1] and maleic acid as essential monomers, and a polyoxyalkylene derivative and maleic acid. The copolymerization ratio with is not particularly limited, but is an equivalent ratio of 7: 3 based on the polymerizable double bond.
To 3: 7, preferably 1: 1 from the viewpoint of copolymerizability of both.
More preferably, the ratio is close to

The molecular weight of the copolymer is not particularly limited, but if the weight average molecular weight is less than 500, a sufficient emulsified state may not be obtained. If it exceeds 500,000, addition to a lubricating oil component becomes difficult. Weight average molecular weight of 500
Preferably it is ~ 500,000.

In the general formula [1], the oxyalkylene group having 2 to 18 carbon atoms represented by AO includes oxyethylene group, oxypropylene group, oxybutylene group, oxytetramethylene group, oxystyrene group, oxydecylene. Group, oxytetradecylene group, oxyhexadecylene group, oxyoctadecylene group, and the like. One or more kinds may be used, and in the case of two or more kinds, random addition or block addition may be used. May be.

N is the average number of moles of the oxyalkylene group added, and n = 1 to 1000, preferably 1 to 100. If the oxyalkylene group is not added, the emulsifiability is poor,
If it exceeds 1,000, it becomes difficult to add it to the lubricating oil component.

The hydrocarbon group having a polymerizable double bond represented by R ¹ and having 2 to 5 carbon atoms or the acyl group having the hydrocarbon group includes vinyl, allyl, methallyl, and 3-butenyl. , 4-pentenyl group, 3-methyl-
Those having a polymerizable double bond such as a 3-butenyl group, an acryl group, a methacryl group, a vinylacetyl group, and a crotonyl group are exemplified.

The hydrocarbon group having 1 to 40 carbon atoms represented by R ² includes methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, amyl, isoamyl, hexyl. Group, heptyl group, 2-
Ethylhexyl group, octyl group, nonyl group, decyl group,
Undecyl, dodecyl, isotridecyl, tetradecyl, hexadecyl, isohexadecyl, octadecyl, isooctadecyl, oleyl, octyldodecyl, docosyl, decyltetradecyl, benzyl, cresyl, butylphenyl Group, dibutylphenyl group, octylphenyl group, nonylphenyl group, dodecylphenyl group, dioctylphenyl group, dinonylphenyl group, styrenated phenyl group, naphthyl group and the like. Examples of the acyl group having 1 to 40 carbon atoms include a formic acid residue and an acyl group having the above hydrocarbon group.

The copolymer (b) can be obtained by copolymerizing the polyoxyalkylene derivative of the general formula [1] with maleic acid using a radical catalyst such as a peroxide. A high molecular weight copolymer can also be obtained by using maleic anhydride and hydrolyzing it after copolymerization to form maleic acid units. In addition, at the time of copolymerization, other copolymerizable monomers such as styrene, α-olefin, vinyl acetate, and (meth) acrylate may be mixed and copolymerized, but are essential monomers. When another monomer is copolymerized at an equivalent ratio exceeding either of the polyoxyalkylene derivative and the maleic acid, sufficient emulsifiability may not be obtained.

The copolymer thus obtained is AO,
By appropriately selecting R ¹ , R ² and n, it is possible to obtain a copolymer having an appropriate emulsifying property corresponding to the type and concentration of the lubricating oil component, the use conditions of the metal rolling oil, and the like.

As the alkylene oxide adduct (hereinafter referred to as amine derivative) of an amine compound having 8 to 40 carbon atoms as the component (c), octylamine, decylamine, coconut oil alkylamine, soybean oil alkylamine, tallow alkylamine, Monoamine compounds such as laurylamine, oleylamine and stearylamine; alkylene oxides of amine compounds such as coconut oil alkylaminopropylamine, tallowalkylaminopropylamine, laurylaminopropylamine, oleylaminopropylamine and diamine compounds such as stearylaminopropylamine Adducts. When the number of carbon atoms of the amine compound is less than 8, emulsifiability is poor, and when it exceeds 40, it becomes difficult to add the amine compound to the lubricating oil component. Examples of the alkylene oxide include ethylene oxide, propylene oxide, and butylene oxide.If no alkylene oxide is added, the emulsifiability is poor.If the number of moles added exceeds 1,000, addition to the lubricating oil component becomes difficult. The number of moles of alkylene oxide added to the compound is preferably in the range of 1 to 1,000.

The metal rolling oil composition of the present invention uses a mixture of a lubricating oil component (a), a copolymer (b), and an amine derivative (c). Is 60 to 99.8% by weight of the component (a) and 0.
When used in the range of 1 to 39.9% by weight and the component (c) in the range of 0.1 to 39.9% by weight, more excellent circulation stability and adhesion can be obtained.

In addition to the above-mentioned components, various known additives such as an oiliness improver, an extreme pressure agent and an antioxidant can be added to the metal rolling oil composition of the present invention, if necessary. As oiliness improvers, stearic acid, oleic acid,
Linoleic acid, linolenic acid, arachinic acid, behenic acid, erucic acid, trimellitic acid, palm oil fatty acid, tallow fatty acid,
Fatty acids such as lard fatty acid, soybean oil fatty acid, rapeseed oil fatty acid, and tall oil fatty acid; esterified products of these fatty acids; dibasic acids such as dimer acid; As extreme pressure agents,
Phosphate esters such as trialkyl phosphate, dialkyl phosphate, triaryl phosphate;
Examples include phosphites such as trialkyl phosphite, dialkyl phosphite and triallyl phosphite. As an antioxidant, di-t-butyl-
Phenolic compounds such as p-cresol; phenyl-α
And aromatic amines such as naphthylamine.

[0020] The metal rolling oil composition of the present invention comprises the above (a)
It is prepared as a mixture of the lubricating oil component, the copolymer of the component (b), the amine derivative of the component (c) and various other additives as required, or as a thick emulsified mixed solution to which water is further added. It is used after dilution with water. The method of use is the same as in the prior art. The metal rolling oil composition of the present invention is added to water or hot water to form an O / W emulsion having a concentration of usually 1 to 20% by weight, which is supplied to the rolling section for use.

[0021]

EXAMPLES Examples of the present invention and comparative examples will be described below. In addition,% is weight%, Mw unless otherwise specified.
Indicates a weight average molecular weight.

Example 1 A metal rolling oil composition was produced with the composition shown in Tables 1 and 2.

[0023]

[Table 1]

[0024]

[Table 2]

The test sample is prepared by diluting the metal rolling oil composition to 10% with water, heating it to 60 ° C., and stirring it at 10,000 rpm for 60 minutes with a homomixer to form an emulsion. went. The adhesion amount of the test sample is
Steel sheet with clean surface (50 × 150 × 0.5mm, S
PCC-D) was set to 150 ° C., spray-coated at a rate of 200 ml / min for 1 second, and the amount of adhesion was measured. The stability of the emulsified state of the test sample was observed 5 hours after preparation according to the following criteria. Table 3 shows the results. Stable: The whole is a uniform emulsified layer. Slight separation: There is a slight transparent separation aqueous layer. Separation: There is a clear transparent aqueous layer.

[0026]

[Table 3]

Examples 2 to 6 and Comparative Examples 1 to 12 In the same manner as in Example 1, metal rolling oil compositions were prepared with the formulations shown in Tables 1 and 2, and test samples were prepared. Table 3 shows the results.

[0028]

According to the metal rolling oil composition of the present invention, it is possible to sufficiently cope with the demands for the contradictory rolling oil of lubricity and circulation stability.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10M 145: 26 133: 08) C10N 30:06 40:24

Claims (2)

[Claims] 1. A lubricant comprising: (a) one or more lubricating oil components selected from mineral oils, fats and oils, and fatty acid esters; and (b) a polyoxyalkylene derivative represented by the following general formula [1] and maleic acid: A metal rolling oil composition comprising a copolymer as an essential monomer and (c) an alkylene oxide adduct of an amine compound having 8 to 40 carbon atoms. R ¹ —O— (AO) _n —R ² ... [1] (where AO is an oxyalkylene group having 2 to 18 carbon atoms, and R ¹ is a carbon atom having 2 to 5 carbon atoms having a polymerizable double bond. A hydrogen group or an acyl group having this hydrocarbon group, R ²
Represents a hydrogen atom, a hydrocarbon group having 1 to 40 carbon atoms or an acyl group, and n = 1 to 1000. ) 2. An alkylene oxide addition of the lubricating oil component of (a) at 60 to 99.8% by weight, the copolymer of (b) at 0.1 to 39.9% by weight, and the amine compound of (c). The metal rolling oil composition according to claim 1, wherein the metal rolling oil composition contains 0.1 to 39.9% by weight.