DE1444777A1 - Lubricating oil mixture - Google Patents

Description

44 777.9 July 17, 1968

ALUMINUM LABORATORIES LIMITED, MONTREAL, QUEBEC, CANADA

LUBRICANT MIXTURE

The invention relates to a lubricating oil mixture having a viscosity of at least 600 redwood / seconds at 37.8 ° C, consisting of a mineral oil and polybutene. . ·

In particular, it is directed to a high viscosity lubricating oil mixture that is used during cold rolling or another Kait machining process comes into contact with aluminum.

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It has been shown that with highly viscous mixes, the polyolefin-like compounds contain ^ within a few

Hours a considerable decrease in viscosity occurs if the mixtures are exposed to heavy loads during operation, in particular due to strong pressure or shear effects. This circumstance represents. For the use; Such lubricant mixings represent a very significant disadvantage, · · ^; ',

The manufacturer of rolling mills usually writes for ^; / "'-

Lubricants to be used / to be used in the bearings of such systems have a minimum viscosity. With a '■■'"'

Polyolefinzusatζ to the lubricant is the disadvantage connected that the viscosity becomes dynamically unstable - "" _ "" ■ -, so that it is difficult to determine the real viscosity of these mixtures under the working conditions with which they are used to meet ν

are exposed to their puncture. ._

On the other hand, polyolefins offer certain advantages as lubricants in plants in which certain aluminum processing processes are carried out. .- ■ ·

BATH ORIGINAL 809801/0447

It is already from the German Auslegeschrift 1 04-9 035

known that aluminum surfaces, even the cheapest Annealing conditions, when annealing strongly start when they are provided with a film of the already known rolling lubricants . are »In the cited patent application rolling lubricants are described to eliminate this disadvantage. During operation In these systems, however, it was found that in many rolling systems the bearing oil tends to get into the rolling lubricant system infiltrate.

The known rolling bearing lubricants are oil fractions with high boiling range, the viscosity of which depends on this range. They have the advantage for use in rolling mills, that their viscosity remains dynamically stable. However, when used in rolling mills, they bring about cold rolling Aluminum has the disadvantage that it strongly discolors aluminum. If now such bearing lubricants in noteworthy The extent to which it can seep into the rolling lubricant

the benefit of using the

new stain-free or only slightly staining rolling lubricant results, as in the Auslegeschrift 1 0 ^ 9 035 described by the use of long-chain, saturated aliphatic alcohols in light oil fractions is created.

BATH

It has already been proposed, because of the relatively low tarnishing effects of polybutene when heated in contact with metal, to produce rolling lubricants from a mixture of polybutene ^e with a light, temperature-resistant mineral oil. These rolling oils had only a relatively low viscosity and only contained approx. 1-3 % polybutenes, with a molecular weight of 50,000 - 60,000, although the use of up to 30 % eolybuteneri was suggested.

When using a lubricant that: To obtain a Viscosity of at least 600 RedWood / seconds at 37.8 ° C Is composed of a commercially available polybutene and a light mineral oil, the Viacosity is due to the occurrence affected by shear forces and within a few hours steadily reduced.

Further, temporarily affected by the high load and Spherkräfte * the viscosity of these oils in such a way that the viscosity under the effect of shear forces and stresses occurring is initially reduced and then * - * - Termination of these pressures increases ^ again ..

The invention is therefore based on the object that in a .Lubricant of the type mentioned at the beginning for heavy loads

""'..'- ■. ■■ '.' ■. ■ :. ; ^: . · - -5-809806 / 0447 "-

- 5 to eliminate the viscosity decrease that occurs.

This object is achieved with a lubricating mixture of the above kind in that the mineral base oil has a boiling range from 175 to 350 ⁰ G, and a bromine number less than 1.5 is that the polybutene has a Molekurlargewicht of less than 2500 and that the mixture additionally contains organic compounds with a molecular weight below 500 with an olefinic double bond and possibly other lubricating oil additives.

Compounds preferred as viscosity stabilizers are styrene, acrylic acid, vinyl alcohol or the tetramer des

Propylene

These very reactive organic substances with low

Molecular weights, which monomers, dimers, tetramers, etc. can represent, can be polymerized in a simple manner due to the presence of a reactive double bond in the molecule. The molecular weight of the viscosity stabilizer is preferably below 250 and should not exceed 500. The addition of 1 - "}% external water content of the propylene is particularly preferred.

809806/0447

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The mechanism by which after the addition of these funds the viscosity can be kept constant, has not yet been fully clarified. Presumably it is Effect on the additives due to the fact that the olefinically unsaturated compounds with the at Breakage of the polybutene chain formed substances with free Implement radical character.

In this way the polymer chain is always newly formed, so that there is no decrease in viscosity.

Since the additive tends to polymerize and since its reaction with the degraded polybutene tends to form compounds of greater chain length, it is important that the percentage of additive added to the lubricant compound is carefully balanced so that one ultimately results It follows that the percentage of the viscosity stabilizer additive is determined by a number of factors such as the stress to which the Sehini ermi ttelverblndung is to be subjected and the molecular weight and the type of polybutenes used in the lubricant compound or one other polyolefins, and the choice of viscosity stabilizer used. If the viscosity stabilizer has one of the σ. G. V _e is rbiadungen, it is _s preferably in an amount of less than 5 JTU ^^ in the range of 1 - 3% is used.

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Considering the use of polybutenes in lubricant compounds for use in the bearings of aluminum rolling mills takes into account the reason why the polybutene composition does not stain on the aluminum leads to the fact that at the temperature of the subsequent annealing the polybutenes simply break into short-chain ones Molecules are broken down that do not discolor the aluminum. It should be noted that only those polyoxines which simply split at or below the annealing temperature let as suitable for use in lubricants for Rolling mill bearings can be viewed. At the same time it is

the
It is desirable that complex compounds formed "as a result" of the addition of the monomers are broken down so that they too do not form any coloring compounds

Rolling abrasive existing complex compounds due to the penetration of bearing lubricants into the same in the Hegel is very slight and consequently their staining is insignificant in many cases "

The following are examples of lubricating oil blends according to the invention shown, which have a high initial viscosity and maintain this after the application of shear forces. Furthermore, they have little, if any

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80-9806 / 0447

There is a tendency to> on aluminum strip during annealing under the conditions described in the Ausleschrift 1 QM> $ 035

to form brown tarnishes.

example 1
Light mineral base oil Z \%) initial viscosity 1600

Polybutene Zk styrene

) Hedwood seconds (no, l)

) at 37.8 ° C, after 15-

) hourly exposure of

) Shear forces 2000 Redwood

) Seconds (# 1) at 37.8 ° C

Example 2
Light mineral base oil %%% -. ) Starting viscosity 1150

Polybutene 128 styrene

) Redwood seconds (Nr * l) at

$ 0 $ ) 37.8 ° G, after 15 hours

) Action of shear forces

) 1350 Hedwood seconds

2%) (No. 1) at 37.8 ° C.

Example 3

Light mineral base oil fr8 # J Starting viscosity 1150

) Hedwoode customers (No. 1) at · C ₀ Cg) 37.8 ° (V » after 15 hours - - _Λ \ effect of the powers of sight

} 1350 redwood seconds acrylic acid Z% } (No. 1) at 37.8 ° G ,.

Polybutene

Example of light mineral base oil

Polybutene 128

Styrene
Lauryl * lkohQl. _t ) Initial viscosity 1200) redwood seconds (No. 1} at) 37.80 c, after 15 hours) exposure to shear forces ) 1800 redwood seconds (No. 1)) at 37.8 ° C.

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Example 5 Polybutene 128 52% Propylene tetramer 2% Stearyl alcohol 0.5% Cetyl alcohol 0.5%

Santolub AR) Anti- $ 0.05

_mrt _ _avlAi ■ _avsm ) oxidations Topanol BHT _{) medium Qfl%} Light mineral
Base oil residual

) Starting viscosity 1250 Redwood-) Seconds (No. l) "at 37.8 ° G, ) after 15 hours of exposure to) shear forces 1475 redwood seconds ) (No. 1) "at 37.8 ° C, -

> · ■

Example 6

The stabilizing effect of other compounds with olefinic double bonds on the viscosity of the polybutenes was investigated. For this purpose, a certain amount of a high molecular weight polybutenes (polybutene 128) was increased to approx. 71 ° C and mixed with a light mineral oil (Mineral Colza Oil), which had a viscosity of approx. 37.5 SSü, a Si ^ d range of approx. of approx. 1500 'SSIf at ^ 7.8® G verm | .scht. Subsequently, part of this burnout mixture was mixed with 2 % of the "'viscosity stabilizer to be examined, which was done by stirring at i. The viscosity was then a

d © s. sl ^ bilized lubricating oil mixture at 37 * 8 ° C- w® &. wap using a redwood no. 1-

. After a 2 ^ -hour operational des ^ i. The original TemperaWr

BATH ORIGINAL

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Ton 37.0, O ⁰ C increased to approx. 52 ° G, the viscosity would be increased at 37.8 ° G using the _; same Hedwood No. 1 viscometer determined again. The results are shown in the following table:

T A BE link LLE End--
viscosity
at 37 ° G Methyl methacrylate 1200; .; ·: Crotonaldehyde Initial viscosity
sity at, -.- -
37 ° G ,, · 1205 - ^ A Dipents 1208 ■: ■ - ■■ .. "->: - Vinyl acetate monomer ..p6o - 1120 '' ,. :: Lower polybutene.
(Mixture of the tetramer
and pentamers of butylene
in the ratio i: l) '- Ϊ157 1200 ' ^: ' ■■: '': Acrylic acid ii68 '-V / Methyl acrylate 1200. "
'''.'.'■"■ 1108 Isophoron 1170; 1175 Mesityl oxide '- 1100. . 11 ^ 0 Kerosene (control test) 850 1130 ll60

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It has been found that by changing the polybutene content in Example 5, the viscosity of 175 Redwood seconds (No. 1) "at 37.8 ° C with 30 $ polybutene to 1000 Redwood seconds (No. 1) at 37.8 ° C with 50% polybutene and up to 2790 redwood seconds (No. 1) at 37.8 ° G could be increased with 6 0% polybutene, in each case using polybutene 128. For the present purpose, a polybutene content of k-5-55 % preferable.

Polybutene Zk and 128 are grades sold by Oronite Chemical Company and indicated with an average molecular weight of about 840 and 3,500, respectively. * In the present invention, preference is given to using polybutene with a molecular weight below 2500, im

Compared to polybutene with a molecular weight of 50,000-6o,000 suggested for use in earlier lubricant compositions already mentioned was.

The light mineral base oil with which the polybutenes mixed is a light petroleum fraction

ORIGINAL INSPECTED

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with a boiling range between 175 and 350 ° C and with a bromine number below 1.5, so there is very little for the leakage contains unsaturated groups responsible for the leakage.

Using a lubricant of 50% polybutene 128 and other ingredients of the composition given in Example 5, excellent protection of the white metal steel bearings of a mill for cold rolling aluminum strips was achieved. ^; ".- :,"■.; . .

His penetration into that which is practically non-staining Cold rolling lubricant produced no tendency to stain the aluminum strip, even if the concentration was reduced of the '^^ bearing lubricant in the rolling lubricant to the unusual Increased by $ 15.

It should be noted, however, that in all of the listed Fall the viscosity of the lubricant one after the other of working hours, due to the very small amount of

Monomers or reactive polymer additive present with low molecular weight actually increased. The stabilization The amount of styrene required for the lower molecular weight polybutene was less than that required for the - '. Stabilization of a polybutene with a higher molecular weight required amount. 0

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It is particularly noted that, although others may also be used as the above-mentioned Viskositätsstabilisätoren for the present purpose, be soluble, any other substance used in the polybutene to a sufficient degree and must be maintained in solution ₄ to cause the viscosity stabilization .

The reason for choosing fropylene tetramer over styrene as an additive, lies in the somewhat toxic properties of styrene »On the other hand Propylene tetramer has the slight disadvantage that a polybutene stabilized therewith causes a slight brown tarnish when heated in connection with aluminum, although

this tarnishing compared to that caused by conventional bearing oils conditional start-up is irrelevant.

The tendency of polybutene type bearing lubricants to tarnish

are stabilized with probylene tetramer, can largely.

through the use of antioxidants such as 0.1 % p-tert, butylpyrocatechol or p-tert. Butylphenol can be suppressed.

Purpose of adding the long-chain, saturated fatty alcohols in Examples 4 and 5 it is considered non-staining

ORiGINAHMSPECTEO " ¹ ^"

High pressure additives at low speed of the rollers too

works. These are preferably straight Fett'alkohole ■: '._ ■ chains with a length of at least? Carbon atoms. Λ. When running slowly, the hydrodynamic lubrication by polybutene is only partially developed. It is therefore advisable to add up to 5%, preferably 1/2 - 2 % _{} of} the high-pressure additive to improve the load-bearing capacity under these conditions.

The purpose of adding the antioxidants such as Santolub AR and Topanol BHT according to Example 5 is to avoid; acid formation in the rolling bearing lubricants. It is already known to be important that rolling oil is mentioned in the interpretative document 1 0 ^ 9 035 must be free from acid it is therefore just as important that each should be in the rolling oil. penetrating bearing oil should not be acidic. The polybutenes contained in a petroleum fraction tend to break down during operation To form acid. However, this difficulty can be overcome by adding a suitable antioxidant. the

Choice of antioxidant depends on the one used Polybutene variety, the type of petroleum fraction and the

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ORfQiNAL INSPECTED 809A06 / OU7 r i /

turned away from viscosity stabilizer. Topanol BHT and Santolub AR are just two of many antioxidants that can be used.

When the lubricant composition according to the invention was examined in a rolling mill for film production, it was found that the lubricant ^{behaved like a non-Newton 1} fluid with increasing coefficients of friction with increasing coefficient of friction in the range in which the lubricant was used. The results showed that the lubricant composition superior to Newton's mineral oils of comparable viscosity which are commonly used in general.

All given ratios are volume ratios.

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Claims (2)

PATENT CLAIMS 1. Lubricating oil mixture with a viscosity of at least 600 Reawood seconds at 37.8 ° C, consisting of one Mineral oil and polybutene, characterized in that the mineral base oil is one Boiling range of 175-350 ° C and a bromine number below 1.5 that the polybutene has a molecular weight of less than 2500 and that the mixture additionally organic compounds with a molecular weight below 500 with an olefinic double bond as well as possibly other lubricating oil additives. 2. Lubricating oil composition according to claim 1, characterized geke η η ζ η et verifiable that it contains, as compounds having an olefinic double bond, styrene, acrylic acid, vinyl alcohol or, preferably, the tetramer of propylene. ' BATH New documents (Af *. * § 1 Paragraph g No. l Safe 3 de§ Xnderurtgsges. V. 4. a. 1967) -8.09 8 0 6/0 44 7 "