JPS61213294A - Lubricating oil for cold rolling of metallic material - Google Patents

Abstract

PURPOSE:A lubricating oil for cold rolling of metallic material such as steel plate, etc., having improved lubricating properties and surface cleaning properties, standing long-period use, obtained by blending fats and oils with a specific dimer acid, a polymer acid and a specified ester. CONSTITUTION:Fats and oils are blended with (A) 0.5-10wt% dimer acid of 16-20C higher fatty acid unsaturated acid and/or polymer acid, and (B) 5.40wt% ester having 750-7,500mol.wt. obtained by condensing the component A with a polyol under heating to give a polyester and reacting the residual carboxyl group or hydroxyl group of the polyester with 1-22C alcohol or 12-22C fatty acid, to give the aimed lubricating oil.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lubricating oil for cold rolling of metal materials, more specifically, a lubricating oil for cold rolling of metal materials that can be rolled in a wide range of thickness. (Hereinafter, it may be abbreviated as cold rolling oil or simply rolling oil.) Regarding K.

[Conventional technology]

Conventionally, the base oil used for cold rolling steel sheets is one made from animal and vegetable fats such as beef tallow, lard, and palm oil, mineral oil, or a mixture thereof, and various additives etc. added to the base oil. There is.

However, in recent years, with advances in cold rolling technology, the number of passes during rolling has been reduced in order to improve productivity.

Higher rolling speeds are required, and in addition, lines for large-scale continuous rolling are highly automated, and demands for streamlining the rolling process and improving the surface quality and standard accuracy of finished steel sheets are becoming stricter. There is.

[Problem that the invention seeks to solve]

However, even conventional cold rolling oils such as beef tallow and palm oil, which are said to have high lubricity, no longer satisfy the above conditions, and rolling is unavoidably carried out under conditions lower than the actual capacity. The situation was that no alternative cold rolling oil had been found. In other words, with conventional cold rolling oil,
Under the harsh conditions assumed in actual operations, the rolling oil composition deteriorates due to thermal decomposition and thermal oxidative decomposition in the rolling oil coolant, and dirt such as iron powder and scum generated during rolling deteriorates the composition. If these contaminants are mixed and adhered to the surface of the rolled steel sheet along with the rolling oil composition and subjected to the post-processing as a coil after rolling, the residual heat of about 130℃ and the temperature of 200 to 300℃ during annealing will occur. Under the conditions mentioned above, chemical reactions such as oxidation and decomposition polymerization result in polymerization and resin formation, making it difficult to remove even during cleaning.
~700℃), resulting in soot stains on the entire surface of the steel plate and a state like edge carbon with soot adhering to the edges of the rolled material, which not only impairs the appearance of the steel plate, but also reduces its neutrality, bondability, and paintability. There were problems such as deterioration of surface treatment properties. Therefore, it has been desired to develop a cold rolling oil that has a lubricating performance superior to conventional fat-based cold rolling oils and is capable of rolling that satisfies the above-mentioned severe conditions.

[Means for solving problems]

As a result of intensive research under these circumstances, the present inventor focused on the excellent rolling lubricity of animal and vegetable fats and oils such as beef tallow, palm oil, and pork fat, and added a predetermined amount of dimer acid and/or polymer acid and A predetermined amount of ester obtained by reacting residual carboxylic acid groups or hydroxyl groups of a polyester obtained by thermally condensing polyols with at least one dimer acid and/or polymeric acid of a higher aliphatic unsaturated acid and an alcohol or fatty acid. The first invention was completed by discovering the fact that a composition containing the following significantly improves rolling lubricity compared to a single animal or vegetable oil such as beef tallow, palm oil, pork fat, etc.

Although the object of the present invention is fully achieved by the lubricating oil according to the first invention, the lubricating oil according to the first invention can be achieved by combining a specific type of antioxidant with the base oil of the first invention. In addition to these properties, it exhibits heat decomposition resistance and heat oxidation resistance when using rolling oil coolant in circulation over a long period of time.
and ■ Excellent properties that can withstand the harsh conditions expected in actual operations, such as excellent degreasing and surface cleanliness of the steel plate after rolling even when contaminated with iron powder, scum, etc. generated during rolling. They discovered that the second invention could be imparted with the following characteristics.

That is, the present invention adds 0.5 to 10% by weight (hereinafter simply indicated by -) of at least one of (A) a dimer acid and a polymer acid of higher aliphatic unsaturated acids having 16 to 20 carbon atoms to fats and oils. b) At least one of dimer acids and polymer acids of higher aliphatic unsaturated acids having 16 to 20 carbon atoms is thermally condensed with polyols to obtain a polyester, and the remaining carboxyl group or hydroxyl group of this is added with an alcohol having 1 to 22 carbon atoms. A first invention for a lubricating oil for cold rolling of metal materials containing 5 to 40 esters having a molecular weight of 750 to 7,500 obtained by reacting fatty acids having 12 to 22 carbon atoms, and furthermore (e) phenolic oxidation. 0.3 to 5.0% each of two or more antioxidants selected from the group consisting of sulfur-based antioxidants, phosphorus-based antioxidants, and amine-based antioxidants; %, 0-3~5.0%
The second invention provides a lubricating oil for cold rolling of metal materials, which contains 0.3 to 5.0% of the lubricating oil for cold rolling of metal materials.

Examples of the fats and oils used as the base oil component in the present invention include beef tallow, palm oil, pork fat, and the like. As the beef tallow, any of crude beef tallow, refined beef tallow, and edible beef tallow can be used, but it is more desirable to use refined beef tallow and edible beef tallow. Crude palm oil, refined palm oil, and deoxidized palm oil can be used as palm oil. Refined pork fat is preferable.

The dimer acid and polymer acid of (a) have 16 or more carbon atoms.
Dimer acids or polymer acids of 20 higher aliphatic monoenoic acids or dienoic acids, such as dimer acids and polymer acids of seamarinic acid, oleic acid, linoleic acid, and gadoleic acid. These dimer acids and polymer acids are used in the range of 0.5-10% of the total composition. If it exceeds this range, the surface cleanliness of the steel plate after rolling will be poor due to poor washability, and if it is less than this range, the lubricity will deteriorate, which is undesirable.

The ester (b) is produced by heating and condensing polyols with at least one dimer acid or polymeric acid of a higher aliphatic unsaturated acid having 16 to 20 carbon atoms to form a polyester. 1-22
It is an ester having a molecular weight of 750 to 7,500, which is obtained by reacting an alcohol or a fatty acid having 12 to 22 carbon atoms.

The dimer acid or polymeric acid used here is the same as the dimer acid or polymeric acid used in (a). Examples of polyols include propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, neopentyl glycol, butanediol, bentanediol, hexanediol, as well as polyoxypropylene glycol, polyoxyethylene glycol, and polyol. Examples include oxypropylene-polyoxyethylene-glycol. Examples of alcohols having 1 to 22 carbon atoms include methanol, ethanol, butanol,
heptyl alcohol, octyl alcohol, caffryl alcohol, nonyl alcohol, decyl alcohol, stearyl alcohol, undecyl alcohol, lauryl alcohol, myristyl alcohol, palmityl alcohol, instearyl alcohol, behenyl alcohol,
Examples include oleyl alcohol. Also, the number of carbon atoms is 12~
Examples of the 22 fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid,
Examples include oleic acid and behenic acid.

If the molecular weight of the ester (b) is less than 750, the lubricity will be poor, and if it is more than 7500, the solubility in the compounding system will be poor and the viscosity will be high, causing problems in handling, so this is not preferred. do not have. These (b) esters are used in the range of 5 to 40 tbc in the total composition, but if they exceed 40 tc, oil stains will occur significantly, and 5 to 40 tc.
If it is less than %, the lubricity decreases, which is not preferable.

Moreover, it is used in the cold rolling oil of the second invention (e
), examples of phenolic antioxidants include 2,6-tert-butyl-p-cresol; 2-tert-butyl-p-cresol;
-tert-butylphenol; 3-methyl-5-
tert-butylphenol; 2,4-di-tert-
Butylphenol; 2゜5-di-tert-butylp
-Cresol; 315-di-tert-butyl-4- and droxybenzyl alcohol: 2.4.6-)
rt-butylphenol; catechol: P-tert-
Butylcatechol; 4,6-tart-butyl-resorcin, 6-(4-oxy)-3,5-tar
t-Butylanilino-2,4-bis-(n-octylthio)-1,3,5-)riazine; (4-oxy-3,
5-di-tart-butylbenzyl)-octadecyl phosphate ester: 4,4'-thiobis(3-methyl-6
-tert-butylphenol): 4,4'-butylidenebis(3-methyl-6-tert-butylphenol);2,2'-methylenebis(4-methyl-
6-tart-butylphenol): 2,2'-
Thiobis(4,6-di-tert-butylresorcin); 12'-methylenebis(4-ethyl-6-tert
-butylphenol); 4°4'-methylenebis(2,
6-tert-butylphenol): 2, 2
'-(3,5-di-tart-butyl-4-hydroxy)propane: 4,4'-cyclohexylidenebis(2,6-di-tert-butylphenol)
;tetrakis[methylene-3-(3I5-tert
-butyl-4-hydroxy 7-c:″ノ′)propionate comethane; hexamethylene glycol bis[β-(
3,5-di-tert-butyl-4-hydroxyphenol)propionate"l: 2,2'-thio[diethyl-bis-3(3,5-di-tert-butyl-4
-Hydroxyphenol)propione-1; 1,3.5
-trimethyl-2,4,6-1lis(3,5-di-te)
rt-phthyl-4-hydroxybenzyl)benzene; bis-(3,3'-bis-(4'-hydroxy-3'-t
ert-butyl-phenyl)-butyric acid cochlicol ester; 1,3.5-)IJsu-4-te
rt-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanuric acid, etc. can be used.

Examples of sulfur-based antioxidants include dilaurylthiodigropionate, simiristylthiodipropionate, distearylthiodipropionate, laurylstearylthiodiglopionate, distearyl-β, βI-thiodiptylate, and dilauryl sulfide. , dioctadecyl sulfide, 2-mercaptobenzimidazole, 5-(
3,5-tert-phthyl-4-hydroxybenzyl)-monoalkylthioglycolate, 4,4'-thiobis-(6-alkyl-3-methylphenol), N-oxy-diethylene-benzotheazylsulfenamide,
Examples include tetraalgylthiuram disulfide and tetraalkyl-thiuram-monosulfide.

Examples of phosphorus-based antioxidants include triphenylphosphite, triotadecylphosphite, tridecyl 7-osphite, trilauryltrithiophosphite, triallylphosphite, and di(dinonylphenyl)-
Mono-(p-/nylphenyl)phosphite, diphenylisodecylphosphite, 0-(2-tert-
Butyl-5-methyl-4-(2-methyl-5-tert
-butyl-4-(hydroxyphenylthio)phenyl]
-8. S/-bis-(laurylthio)phosphite,
Phenyl diisodecyl phosphite, phenyl-di-1so-octyl phosphite, tris (cyclohexylphenyl) phosphite, tris (0-cyclohexylphenol) 7-osphite, tris (0-piphenyl) phosphite, tris (p-phenylphenol) phosphite , alkyl (C8~, 2) cyclohexyl 7-osphite, alkyl (CA-+tl phenyl cyclohexyl phosphite), and the like.

In addition, as an amine antioxidant, fetchazi
; N, N'-G tert-pf A, -p
-71 nylenediamine, 4,4'-tetramethyl-
Diaminodiphenylmethane; 4-hydroxydiphenylamine; N-amino-Nl-phenylparaphenylenecyamine; N,Nl-bis(octylphenyl)amine; N,N'-diphenyl-p-phenylenediamine;
N,N'-disalicylidene-1,2-diaminopropane: 4,4'-bis(4-α,α'-dimethylbenzine)diphenylamine: 4,4'-dicumyldiphenylamine; N,Nl-di-2-naphthyl- p-phenylenediamine, N,Nl-ditolyl-p-phenylenediamine; N-amino-N'-phenylparaphenylenediamine;N,Nl-dicyclohexylparaphenylenediamine;NIN'-diphenyl-p-phenylenediamine, etc. I can give it to you.

Among the antioxidants mentioned in (C), phenolic antioxidants account for 0.3% to 5.0% of the total composition, sulfur based antioxidants account for 0.3% to 8.0% of the total composition, and phosphorus based antioxidants account for 0.3% to 8.0% of the total composition. The inhibitor is used in an amount of 0.3 to 5.0% in the total composition, and the amine antioxidant is used in an amount of 0.3 to 5.0% in the total composition. If these exceed the above range, they will adversely affect the lubricity, and if they are less than 0.3%, the effect as an antioxidant will be reduced, which is not preferable.

In addition to the above-mentioned essential components oils and fats (a), (b), or (C), the lubricating oil for cold rolling of the present invention may optionally contain various conventionally known additives, such as: Surfactants, rust inhibitors, extreme pressure additives, etc. can be added.

(9) Any one of the above antioxidants used in the second invention can be blended into the rolling oil of the first invention.

Examples of the surfactant include nonionic surfactants such as polyoxyethylene alkyl phenyl ether, holoxyethylene alkyl ether, polyoxyethylene alkyl ester, polyoxyethylene polyoxypropylene ether, and rubitan alkyl ester, and alkyl phosphate esters. Phosphate ester surfactants such as salts and polyoxyethylene alkyl phosphate ester salts are used, and are usually blended in an amount of about 0.5 to 5% in the lubricating oil for cold rolling.

As the rust preventive agent, for example, amines and their derivatives, alkenylsuccinic acids and their derivatives, phosphoric acid esters and their derivatives, etc. are used, and are usually blended in the lubricating oil for cold rolling in an amount of about 0.1 to 5.

Examples of extreme pressure additives used include phosphorus compounds such as trialkyl phosphates and trialkyl phosphites, and organometallic compounds such as zinc dialkylthiophosphate. % is added.

〔Effect of the invention〕

The cold rolling oil composition obtained by adding the compounds (a) and (b) to the oil and fat of the present invention has excellent lubricity and surface cleanliness. In addition, a cold rolling oil obtained by further combining two or more antioxidants selected from (c) phenolic antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and amine-based antioxidants. The composition has excellent thermal decomposition resistance,
It has heat oxidative decomposition resistance, maintains stable and high lubricity over a long period of time in actual operation, and can improve the cleanliness of steel plates after washing.

Furthermore, compared to conventional products, the lubricating oil for cold rolling of the present invention has better lubricity than conventional commercially available oil-based rolling oils, and can withstand long-term use in actual operations. Also, the cleanliness of the plate surface after washing the steel plate after rolling is excellent.

〔Example〕

Next, the present invention will be explained with reference to Examples.

Example 1 Various tests were conducted on various rolling oils having the compositions shown below. The results are shown in Tables 1 and 2.

■ Rolling oil (all composition units are heavy) (1) Rolling oil of the first invention &1 Refined beef tallow 66 Polymerized acid (t) 1 Ester (A) 30 Surfactant (a) 3 &2 Refined palm oil 69 Polymerized acid (2) 5 Ester (B) 20 Surfactant (b) 5 Phenolic antioxidant (A) I P63 Crude beef tallow 40 Refined palm oil 40 Polymerized acid (3) 6 Ester (c) i.

Surfactant (C) 3 Phosphate ester antioxidant (A) I Edible beef tallow 81 Polymerized acid (4) 10 Ester (C) 5 Surfactant (a) 3 Phenol antioxidant (B) I Refined beef tallow 50 Fine pork fat 27 Polymerized acid (5) 4 Ester (E) 15 Surfactant (C) 3 Sulfur-based antioxidant (A) 1 (2) Rolling oil of the second invention &6 Refined beef tallow 69 Polymerized acid ( 1) 1 Ester (A) 25 Surfactant (a) 3 Phenolic antioxidant (A) 1 Phosphate ester antioxidant (B) 1 7 Edible beef tallow 68 Polymerized acid (2) 5 Ester (Bl 20 Surfactant (b) 3 Phenolic antioxidant (B) 1 Sulfur-based antioxidant (A) 3 B Refined palm oil 74 Polymerized acid (3) 6 Ester (C110 Surfactant (C) 5 Sulfur-based antioxidant Agent (B) 4 Phosphate ester antioxidant (C) 1 &9 Crude beef tallow 40 Refined palm oil 47.5 Polymerized acid (4) 10 Ester (D) 5 Surfactant (a) 3 Phenol antioxidant ( C) 4 Amine antioxidant (A) 0.5 Refined beef tallow 5° Refined pork tallow 25,5 Polymerized acid (5) 4 Ester (E) 15 Surfactant (b) 3 (3) Comparative rolled oil refined beef tallow 93 Polymerized acid (4) 1 Ester (C) 1 Surfactant (a) 5 Refined palm oil 89.7 Polymerized acid 11) 0.3 Ester (A
) 5 Surfactant (b) 5 Crude beef tallow 94 Polymerized acid (1) 2 Surfactant (c> 3 Phenolic antioxidant (A) 1 Refined beef tallow 93 Beef tallow fatty acid 2 Surfactant (1) 3 Sulfur oxidation Inhibitor (B) 1 Phosphate ester extreme pressure agent (A) 1 Mu 5 Commercially available tallow-based rolling oil Muro Commercially available mineral oil-based rolling oil In addition, in the above composition, polymeric acid, ester, surfactant, antioxidant and extreme pressure agent means the following:

Polymerization acid (1)...Polymer acid of olefinic acid and linoleic acid (equal mixing ratio of the two components) (polymer acid of dimer acid, nitrimer acid or higher = 4:6) Polymerization acid (2)
... Polymer acid of tall oil fatty acid (polymer acid of dimer acid, nitrimer acid or higher = 8:2) Polymer acid (3) ... Polymer acid of soybean oil fatty acid (polymer acid of dimer acid, nitrimer acid or higher = 6: 4 + Polymerization acid (4)...polymer acid of oleic acid (polymer acid higher than dimer acid, nitrimer acid = 9:1) Polymerization acid (5)...seamaric acid, oleic acid, and cadreic acid (the blending ratio of the three components is equal amount)
Polymer acid (dimer acid, nitrimer acid or higher polymer acid = 9 = 1) Ester (A) ... Polymer acid (2) 100 P and diethylene glycol 25.6 F were blended in a nitrogen stream,
Polyol polyester (hydroxyl value = 75) 100F obtained by heating condensation at 220°C under normal pressure and stearic acid (
Acid value = 104) 36) in a nitrogen stream, normal pressure, 22
Ester obtained by heating condensation at 0°C (hydroxyl value = 7,
Acid value = 8, average molecular weight = 150 Ql Ester (B)...Polymerized acid (4) 100 P and diethylene glycol 23? A mixture of polyol polyester (hydroxyl value = 44 + 100?) and isostearic acid (acid value = 205) 23? obtained by blending and heating condensation at 220 ° C. in a nitrogen stream at normal pressure.

Ester obtained by heating condensation at 220°C in a nitrogen stream at normal pressure (hydroxyl value = 6, acid value = 6, average molecular weight = 250
01 Ester (C)...Polymerized acid +5) 100? And propylene glycol 22? in a nitrogen stream, at normal pressure,
Polyol obtained by heat condensation at 220°C A mixture of 100P polyester (hydroxyl value = 112) and behenic acid (#1 value = 161) was combined with a heating wire at 220°C at normal pressure in a nitrogen stream. Nine esters (hydroxyl value = 9, acid value = 8
, average molecular weight = ester (D)...polymerized acid (3) 1
00 P and polyethylene glycol (average molecular weight = 20
Polyol polyester (hydroxyl value = 25) 10051' and palmitic acid (acid value = 218) obtained by blending 0) 41) and heating and condensing it at 220°C at normal pressure in a nitrogen stream
lly- and heat condensation in a nitrogen stream at normal pressure at 220°C (hydroxyl value = 5, acid value = 4,
Average molecular weight = 4500 + ester (1)...Polymerized acid (
4) 1001F and neopentyl glycol 10? And diethylene glycol 10? 100p of polyonyl polyester (hydroxyl value = 23) obtained by blending and heating condensation at 220 ° C. in a nitrogen stream with palmitic acid (acid value = 256) 9) in a nitrogen stream, Normal pressure, 220℃
Ester obtained by heating and condensation (hydroxyl value = 4, acid value = 5, average molecular weight = 50001 surfactant (a)...
Polyoxyethylene nonylphenyl ether (number of moles of ethylene oxide added n = 6) Surfactant ('b)...polyoxyethylene lauryl ether (number of moles of ethylene oxide added n = 5
) Surfactant a (e)...polyoxyethylene monostearate (number of moles of ethylene oxide added n = 7) phenolic antioxidant (A)...2 e 5-sheet
rt-butyl-p-cresol phenolic antioxidant (B)...4,4'-butylidenebis(3-methyl-5-tart-butylphenol) Phenolic antioxidant (C)...tetrakis[methylene-3 -(3,5-di-tert-butyl-4-hydroxyphenyl) flobionate comethane phenolic antioxidant (DJ...bis-(3,3'
-Bis-(4'-hydroxy-3'-tert-butyl-phenyl)-butyric acid coglycol ester sulfur-based antioxidant (A)...Laurylstearylthiodipropionate sulfur-based antioxidant (B)・5-(3,5-jeeter
t-phtheru-4-hydroxybenzyl)-alkylthioglycolate phosphate ester antioxidant (A)...triallylphosphite phosphate ester antioxidant (B)...phenyl-diigo-octylphosphite Phosphate ester antioxidant (C)... Tris (0-
biphenyl) phosphite amine antioxidant (A)...N, N'-T
art -Butyl-p-phenylenediamine phosphate ester extreme pressure agent (A)...Tricresyl phosphate ■ Test items and test methods (1) Lubricating performance Using a Timken tester, concentration 5-1 temperature 50°C An O-rolling oil emulsion was prepared in advance in a tank and was circulated and supplied. The evaluation was carried out based on the size of the area (OK area) within the seizure limit curve that connects the front load and rotational speed that cause seizure color, and the improvement rate was shown as 1.0 for those that were inferior.

(2) Long-term circulation stability concentration of emulsion 5 weight -
1. A rolling oil emulsion with a temperature of 60°C was prepared in advance, and iron powder (particle size of 5μ or less) was added to 0, assuming iron powder generated during rolling.
．． It was added in an amount of 3% by weight. Next, this was continuously circulated and injected onto an iron roll heated to 150°C at a pressure of 25 to 9/cIi using a gear pump, and after 48 hours, the oil content of the emulsion after removing the upper layer floating oil was extracted and weighed, and the initial preparation oil was The amount of decrease relative to the amount was determined.

In addition, the emulsion stability (Emul-sio)
n 5tability Index ) was also measured.

ESI is emulsion 5O collected from the tank intermediate layer.
After O- was allowed to stand still for 10 minutes, it was expressed as the ratio of the oil content in the upper layer 100rnl to the oil content in the lower layer 100TR1.

Table 1 Table 2 (tank temperature 50℃) *Values after circulation time of 0.20.48 hours Tables 1 and 2
As is clear from the table, the one-time rolling lubricating oil of the present invention was superior to the comparative rolling oil in both lubricating performance and long-term circulation stability.

that's all

Claims (1)

[Claims] 1. Fats and oils contain (a) 0.5 to 10% by weight of at least one of dimer acid and polymer acid of higher aliphatic unsaturated acids having 16 to 20 carbon atoms, (b) carbon number Polyols are thermally condensed with at least one of dimer acid and polymeric acid of 16 to 20 higher aliphatic unsaturated acids to obtain a polyester, and the remaining carboxyl group or hydroxyl group of the polyester is treated with an alcohol having 1 to 22 carbon atoms or an alcohol having 12 carbon atoms. A lubricating oil for cold rolling of metal materials, characterized in that it contains 5 to 40% by weight of an ester having a molecular weight of 750 to 7,500, which is obtained by reacting 1 to 22 fatty acids. 2. In fats and oils, (a) 0.5 to 10% by weight of at least one of dimer acids and polymer acids of higher aliphatic unsaturated acids having 16 to 20 carbon atoms, and (b) higher fats having 16 to 20 carbon atoms. Polyols are thermally condensed with at least one of a dimer acid and a polymeric acid of group unsaturated acids to form a polyester, and the remaining carboxyl group or hydroxyl group is reacted with an alcohol having 1 to 22 carbon atoms or a fatty acid having 12 to 22 carbon atoms. (c) 2 types selected from the group consisting of phenolic antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and amine-based antioxidants; The above antioxidants were added in an amount of 0.3 to 5.0% by weight, 0.3 to 8.0% by weight, and 0.0% by weight, respectively.
A lubricating oil for cold rolling of metal materials, characterized in that it contains 3 to 5.0% by weight and 0.3 to 5.0% by weight.