DE1056313B - Non-corrosive lubricants - Google Patents

Description

C ") M

GERMAN

PATENT OFFICE

kl. 23 c 1/01

INTERNAT. KL. C 10 А1

EXPLAINING EDITORIAL 1056 313

B 47310 IVc / 23 c

REGISTRATION DATE: DECEMBER 31, 1957

NOTICE
THE REGISTRATION
AND ISSUE DEK
EDITORIAL ·. APRIL 30, 1959

It 'has proven to be necessary in many cases, when lubricating machines, motors or metallic workpieces to be used lubricants to add such substances that the Reduce corrosion of metals and rust formation to a minimum. Additives of this kind, which are referred to in the literature as inhibitors are, for. B. required for such engine oils (preservative oils), which after a short test run the inner parts of newer engines during storage or during transport, especially by sea, to protect them from the effects of changing weather conditions and should then be used again as engine oil for a certain period of time. AuA turbine oils, which come into contact with water or water vapor during their use, or drilling oils, which are used in the form of aqueous emulsions generally require additives such as if they are to meet the requirements.

When using corrosion and rust inhibitors In lubricants it has been shown that these additives sometimes have different effects, i. h., they are able to provide effective protection against a certain corrosive or rust-forming agent confer, however, have only a reduced protective ability against the attack of other agents or are even completely ineffective. Some of these inhibitors also have the disadvantage that they Affect properties of the lubricants in an unfavorable way, especially if the lubricants contain other additives.

It has now been found that the corrosion and rust formation of lubricants is reduced quite considerably if you give them Dihydroxyimidazolidone of the general formula

Non-corrosive lubricants

Applicant:

Aniline & Soda Factory in Baden

Corporation,
ίο Ludwigshafen / Rhine

Dr. Alfred Woerner, Limburgerhof (Palatinate),
Dr. Walter Franke and Dr. Diether Fischer,

Ludwigshafen / Rhine,
have been named as inventors

R "

R '

O O

R'- C CR '

R-K

, NH

clogs.

In the above formula, R can be an alkyl or a Aral'kyl radical with more than 8 carbon atoms, R 'and R "can be hydrogen atoms, alkyl, alkenyl, alkynyl, Be aryl or aralkyl radicals, while X is an oxygen or sulfur atom. The substituents R 'and R "do not need to be identical; they can also be different from those specified

Belong to groups. It is not necessary that the etherification of the Dihydiroxyimidazolidone is complete, d. That is, a hydroxyl group can also stand next to an ether group.

Also the methylol compounds mentioned

Substances, which are obtained by the addition of formaldehyde to the NH group, "have proven to be very effective corrosion «and rust-preventing additives proven.

Examples of the group of substances mentioned are

the following compounds are mentioned: N-stearylglyoxalmonourein as well as its ether, e.g. B. methyl, ethyl, propyl or butyl ether, and the corresponding Methylol compounds', also the dimethyl- and dibenzyl-N-stearyldihydroxy-imidazolidonie, which their-

on the one hand etherified or reacted with formaldehyde can, finally also the thioureins, z. B. the N-palmityl-glyoxaldihydroxymonothiourein.

The compounds mentioned can be lubricants, like mineral or vegetable oils,

Ester oils, lubricating greases, or polar lubricating oils can be added.

The production of the additives mentioned is known per se; B. in the German patents 889152, 910 475, 920965, 962 795.

There is a particular advantage of the compounds claimed as additives according to the invention in that they do not contain organic ash-forming constituents contain and are free of undesirable elements such as chlorine.

909 508/407

Claims (1)

Another advantage that should be emphasized is that the compounds mentioned have the effect of other additives (ζ. B. HD additives. EP additives, VI and stock image improvers) not affect. example 1 0.1 g of stearylglvoxalmonourein was dissolved in 500 ml of a refined lubricating oil intended for use as turbine oil. This combination was tested for rostverhinderade property, namely! In the prescribed for turbine oils test method ASTM D 665-52 T. This dip steel bars certain composition at 60 ⁰ C in an oil-water Mischuaig which is stirred constantly intense . The test of the lubricating oil combination prepared as above showed no signs of rust formation after 24 hours. An experiment carried out under the same conditions without the addition of the butyl ether of stearylglyoxal monourein showed strong rusting after just 1 hour, and after 24 hours there was total rust entered the surface. Example 2 400 ml of a motor oil of class SAE 10 produced by solvent refining were added 0.8 g of monomethyl ether of stearylglyoxalmonourein added and dissolved with gentle warming. The lubricating oil combination obtained in this way was then tested for its ability to resist iron parts to give effective protection against attacking hydrobromic acid. This ability is from the following Reason of great importance: gasoline containing lead tetraä thy I is known to contain also small amounts of organic bromine compounds (e.g. ethyl bromide). When taking place in the engine When such gasoline is burned, small amounts of hydrogen bromide are always produced. those under suitable Conditions that can attack cylinder liners and other metal parts. The well-known "acid neutralization" test was used for testing (MIL-L-21260) is used. Here, Evsen strips are placed in 0.1% hydrobromic acid for 1 second given and then dipped several times into the oil to be tested; after 4 hours it will then the appearance of the metal surfaces assessed. In which A ^ request with the described engine oil combination After this time there were still no signs of corrosion. while in a parallel experiment with the oil without additives after just a few keyways Corrosion was found. Example 4 0.05 percent by weight of monobutyl ether of stearylglyoxal monourein was dissolved in an SAE90 gear oil. This solution was examined for its corrosion-inhibiting effect against a salt water solution. For this purpose, the lubricating oil test method specified in the journal »Schweizer Archiv«, January 1953, pp. 26 and 27, was chosen. Under this method, sanded sheet iron pieces are inserted into the test oil and then dropped a 3 ^fl / o saline. The sheet iron inserted in the described gear oil combination remained completely corrosion-free even after 4 days at a temperature of 60 ° C, while a similarly treated sheet in the unalloyed gear oil showed strong, visible signs of corrosion after just a few hours. It is already known to add substituted glyoxalidines to lubricating oils as emulsifiers. Comparative experiments have shown that these compounds are used as corrosion-preventing additives according to the invention Dihydroxyimidazolidonen claimed as additives are inferior. If you dive z. B. a test panel covered with an oil film of motor oil (SAE 20, Solvent Neutral) is coated with 0.4 percent by weight of 1 - hydroxyethyl - 2 - oleylglyoxalidine, In sea water (20 ° C) for 20 hours, after this time there is a clear build-up of rust on the entire surface of the sheet. On the other hand, an oil film made of the same engine oil, however, protects 0.4 percent by weight of monomethyl ether of stearylglyoxalmonourein was added to the test panel considerably better. Only after 75 hours do faint rust spots appear on the edges of the sheet. the OH or OR "-Gnippen, which in the invention Compounds claimed as additives are contained, cause particularly good protection against Corrosion, as these groups hold the oil in a thin layer on the surface of the metal. Patent AKSPRi-cH: Non-corrosive lubricants, characterized by a content of dihydroxyimidazolidones of the general ¹ «! formula R "R"
0 0 R 'C C-R' B e i s ρ i e 1 3 In another engine oil (SAE 20, Solvent Neutral) was 0.4 percent by weight of monomethyl ether des Stearvlglyoxalmonourein dissolved. This solution was used in the so-called salt water immersion test Tested for their anti-corrosion effect (MIL-L-21260). The test panels coated with the oil to be tested are immersed in artificial ones for 20 hours Hooked in seawater and then examined the condition of the metal. Examining the said After this time, the oil combination still showed metal surfaces without corrosion, in a parallel test of the Very intense corrosion was found in the oil without additives. R-N. NH where R is an alkyl or an aralkyl radical with more than 8 carbon atoms, R 'and R "are hydrogen atoms, Alkyl, alkenyl, alkynyl, aryl or aralkyl groups, and X is an oxygen or sulfur atom mean. Considered publications:
U.S. Patent Nos. 2,581,132, 2,599,384, 2,767,143. © S09 508y407 4.