DE1129647B - Lubricants and coolants for rolling metals - Google Patents

Description

The invention relates to a lubricant and coolant for use in rolling metals, the is a further development of the subject matter of patent 1104,104.

The subject of patent 1104104 is the use of mixtures of a predominant proportion of water, homogeneous at room temperature, with the addition of a polyoxyalkylene liquid with a negative solution coefficient in water, which at least at the rolling temperature independently convert to oil-in-water emulsions, as lubricants and coolants during rolling of metals, as well as the composition of such a coolant and lubricant for the same purpose, consisting of the same components with a further content of such a surface-active substance that ^{prevents the separation of more than 0.1 cm 3 of the} oil phase in the emulsion stabilization test.

However, these lubricants and coolants show a tendency to corrode some metals. Corrosion inhibitors are added for this purpose. It has now been found that the addition certain anti-corrosive agents, namely from alkali salts of a fatty acid to lubricants and coolants gives a higher resistance to corrosion without impairing their roller behavior.

According to the invention, therefore, a lubricant and coolant for rolling metals is made from a larger proportion of water, a smaller proportion of a liquid polyoxyalkylene with negative Solubility coefficient in water, which is determined by a content of a small amount of an alkali or Alkaline earth metal salt of a fatty acid with at least 10 carbon atoms in the molecule is.

The liquid polyoxyalkylenes used in the lubricants of the present invention are the same as according to the subject-matter of the main patent and have the general formula

R ₁ -O- (R ₂ O) _n -R ₃

in which R ₁ and R _{3 are} a hydrogen atom, a hydrocarbon _{radical or an acyl group, R 2 is} an alkylene radical and η is an integer. In the polyoxyalkylene chain - (R ₂ O) _n - the radical R can be any alkylene radical, preferably an alkylene radical having 2 to 8 carbon atoms. Polyoxyalkylene liquids in which the alkylene radical is an ethylene or propylene radical are particularly preferred in the preparations according to the invention.
As a salt in the lubricants and lubricants according to the invention

Lubricants and coolants
for rolling metals

Addendum to patent 1104 104

Applicant:
"Shell" Research Limited, London

Representative: Dr.-Ing. F. Wuesthoff, Dipl.-Ing. G. Pulse and DipL-Chem. Dr. rer.nat. E. Frhr. v. Bad luck man, Patent Attorneys, Munich 9, Schweigerstr. 2

Claimed priority:
Great Britain August 25, 1958 (No. 27 209)

Philip Alan Winsor, Willington, Cheshire,
and Kenneth Alan Lloyd, Barrow, Cheshire

(Great Britain),
have been named as inventors

Coolants can be the salt of any alkali or alkaline earth metal, preferably an alkali salt and especially the sodium salt can be used. The salt is a salt of a saturated or unsaturated- Fatty acid with at least 10 carbon atoms in the molecule, e.g. lauric acid, myristic acid or palmitic acid. A salt of a fatty acid having 16 to 30 carbon atoms is preferably used in the molecule, e.g. B. oleic acid or stearic acid. In the lubricants and coolants are preferably between 0.05 and 5 percent by weight, in particular between 0.05 and 1.0 percent by weight, of the salt before.

The lubricants can also have a smaller proportion in addition to the metal salts according to the invention one; other common anti-corrosion agents included according to main patent.

Furthermore, they can contain surface-active agents according to the main patent, ie those which ^{prevent the separation of more than 0.1 cm 3 of the} oil phase as the lower layer in the emulsion stabilization test. Surfactants which meet this test when used at concentrations between 0.05 and 0.5 weight percent are particularly preferred.

. ■ 209 580/359

The emulsion stabilization test is carried out as follows: 0.5% by weight of the surfactant Means are added to 100 ml of an aqueous solution containing 5 percent by weight of the Monoether of a mixed polymer of ethylene oxide and propylene oxide with statistical distribution in Contains molecule. The solution is mixed thoroughly and heated to 70 ° C. Because this temperature is above the separation temperature of the solution, an emulsion is formed. The solution is 3 hours Left to stand at 70 ° C, whereupon the volume of the lower layer, which may be deposited, is shown has, measures. This lower layer consists of liquid polyoxyalkylene concentrate and its volume is a measure of the instability of the emulsion. The most suitable device for this experiment is a centrifuge measuring glass with a diameter at the top of about 38mm, which extends downwards too rejuvenated.

It should be emphasized that the invention The fatty acids used in sake are also surface-active Can represent means; however, they fall not among those who meet the above text

In the examples below are the parts Parts by weight.

example 1

The following lubricant formulation was used for cold rolling steel.

Monobutyl ether of a polyoxyalkylene

glycol "its polyoxyalkylene chain
t 1 α Α λ

35

₄ o

45

5 °

55

ity of 660 SUS at 37.8 ° C has .. 4 parts

Diethanolamine 0.5 parts

Polyethylene glycol dioleate 1.0 TeU

NatriurnoleaY 0 1 part

^ _ater 94 parts

Using this lubricant it was possible to do five speeds at one roller speed of 61 m / min, at the point of contact the thickness of a steel band of 1.270 mm 0.3048 mm.

. .
Example 2

The following lubricant formulation was used for cold rolling steel:

Monobutyl ether of a polyoxyalkylene glycol, its polyoxyalkylene chain
consists of oxyethylene and oxypropylene residues and has a viscosity of 660 SUS at 37.8 ° C .. 6 parts

Sodium Laurate 0.2 parts

^ ■ _ater 92 parts

When steel is cold-rolled, a preparation containing 6 parts of monobutyl ether of a polyoxyalkylene glycol gives whose polyoxyalkylene chain consists of oxyethylene and oxypropylene radicals and the has a viscosity of 660 SUS at 37.8 ° C, and parts water, acceptable rolling performances. the Leaves showed considerable signs of corrosion. In a laboratory test, one showed Plate in half an hour showing signs of corro- sion if you do the above preparation Run at 50 ° C over an inclined steel plate at 50 ° C. In a similar attempt with the preparation according to example 2 no corrosion is observed.

Example 3

The following lubricant formulation was used in the hot rolling of aluminum. The received Sheets were of excellent anodizing quality, i.e. they had a very bright appearance on.

_M onobutyläther a polyoxyalkylene _{whose Polvoxvalkylenkette}

oxyäthylen- and oxypropylen _{residues b} ' _{consists and which has a} f yiskosi _{ity of 660 sus at 37 ° C} .. 2 parts
Sodium oleate 0 1 part

Claims (1)

PATENT CLAIMS: 1. Lubricant and coolant for rolling metals according to patent 1104 104, characterized by an additional content of an alkali or alkaline earth salt of an optionally unsaturated «R ^ trrif ^{at least 10 carbon atoms} atoms in the molecule } · Lubricant and coolant according to claim 1, characterized by a content of 75 to ⁹⁸ percent by weight water, 2 to 20 percent by weight polyoxyalkylene compound and between 0.05 and 5 percent by weight, preferably 0.05 to 1 percent by weight, of an alkali or alkaline earth metal salt of a fatty acid . 3. lubricant and coolant according to claim 1 or 2, characterized in that the alkali or the alkaline earth salt of the fatty acid has 16 to 30 carbon atoms in the molecule. 4. lubricant and coolant according to claim 1 to 3, characterized in that the fatty acid salt is a salt of oleic acid. ^{when the} fatty acid is a sodium salt. ". . ^ ^B ^ ^costume f * & f ⁶ publications:
British Patent No. 716,354;
French Patent No. 1065 376;
Brochure "Ucon Fluids and Lubricants"(1948); Mechanical Engineering (1951), pp. 472/473;
Iron and Steel Engineer (1948), pp. 56/57. © 209 580/399 5.62