FI60885C - SMOERJMEDELKOMPOSITION - Google Patents

Description

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Patent and Registration Office '' Ansekan utlagd och utl.skriften publkarad 31.12.8l (32) (33) (31) Claim requested privilege —Beglid prloritet 15 * 08.75 USA (US) 601 + 977 (71) Mobil Oil Corporation, 150 East l + 2nd Street, New York, NY, USA (72) Eldon Lester Armstrong, Mullica Hill, NJ, Samuel Joseph Leonardi,

This invention relates to lubricant compositions, and more particularly to lubricant compositions which are normally exposed to scattering by ultraviolet light, such as light present in photochemical radiation such as photochemical radiation. in the light of.

More particularly, the invention relates to lubricant compositions such as lubricating viscosity oils, hydrocracked lubricating oils, hydraulic oils, mineral oils or fractions thereof, automotive oils, gear oils, lubricating agents, ultra-lubricating agents, waxes, greases and other forms of lubricants.

In general, the preparation of lubricant blends, for example hydrocracked lubricating oils, provides a relatively high viscosity index and allows the use of certain raw materials that would be unsuitable for other processes. On the other hand, however, hydrocracked lubricating oils tend to have poor stability against ultraviolet light scattering, rapidly forming 2,608,85 suspended and / or precipitated insoluble materials when exposed to ultraviolet light, such as sunlight or other sources of photochemical radiation. Compounds capable of absorbing ultraviolet light, e.g., hydroxybenzophenone 11a and hydroxyphenylbenzotriazoles, have provided some improvement in the light stability of hydrocracked oils. Conventional antioxidants have also provided some benefit.

In the literature, Heskins and Guillet, in the article "Mechanism of Ultraviolet Stabilization of Polymers", Macromolecules 1, 97 (1968) were the first to propose the loose mechanism of ultraviolet shielding energy. Commercially available ultraviolet stabilizers are also listed by class and function and identified in structure in the Kirk-Othmer compilation "Encyclopedia of Chemical Technology"; second edition, Oh. 21, pages 115-122. Uri mentions in the article "Thermal and Photochemical Oxidation of Polymers and Its Prevention", Chemistry and Industry, March 1, 1975, pages 199-203 bis (stilbene dithiolate) on the conventional antioxidant effects of nickel (hydroperoxide decomposition and free radical scavenging) and its Ulta-violet light. British Patent 1,263,910 (1972) discloses bis (stilbene dithiolate) nickel as an antioxidant in plastic materials. The patent also mentions the excellent hydroperoxide degradability of this additive. U.S. Patent 3,832,304 discloses the use of aromatic azo compounds to stabilize hydrocracked oils. None of the above disclosures discloses lubricant compositions comprising the organic sulfur-containing nickel complexes described herein.

In accordance with the present invention, we have found that protection against scattering by ultraviolet light, which is present in sunlight or other sources of photochemical radiation, can be effectively provided to lubricant mixtures by incorporating nickel complexes containing organic sulfur. These nickel complexes are particularly effective against ultraviolet dispersion in lubricating media such as oils with lubricating viscosity, hydrocracked lubricating oils, hydraulic oils, mineral oils or their fractions, lubricating oils, lubricating oils, gear oils, transmission oils, the presence of stabilizers against the diffusing effect of ultraviolet light.

60885

The invention thus relates to a lubricant mixture containing a stabilizing amount of an organic nickel compound against ultraviolet dispersion, and the invention is characterized in that the nickel compound is a nickel phenol sulphide of the formula

R R

or nickel phenol phenolate sulfide of the formula?

H Ni "H

R R

or

I Ni - OH

: ^ "i - ^

HO "I" OH

R R

in which R represents a hydrogen atom or an alkyl group having up to 30 carbon atoms.

4 60885

Organic sulfur-containing nickel complexes can be effectively used in any amount sufficient to give the lubricant the desired degree of protection against ultraviolet dispersion. In many cases, the nickel complex is effectively used in an amount of about 0.01 to b% by weight, and preferably in an amount of about 0.1 to 2% by weight of the total amount of the lubricant mixture. The term "nickel complex" as used herein is intended to include nickel compounds having chelate ring formation. As mentioned above, organic sulfur-containing nickel complexes can be incorporated into any lubricating medium which may contain oils having a lubricating viscosity, and also to fats in which one of the above oils is used as an excipient. In general, synthetic oils can also be effectively protected against ultraviolet dispersion or can also be used in conjunction with mineral oils or as fat excipients. Typical synthetic excipients include polyisobutylene, polybutenes, hydrogenated polydenes, polypropylene glycol, polyethylene glycol, trimethylolpropane esters, neopentyl and pentaerythritol esters, di (2-ethylhexyl) sebacate, di (2-ethylhexyl) sebacate, di (2-ethyl) esters of phosphorus-containing acids, liquid ureas, ferrocene derivatives, hydrogenated mineral oils, chain-type polyphenols, siloxanes and silicones (polysiloxanes), alkyl-substituted diphenyl ethers, etc., of which are butyl-substituted bis (p-phenoxy) phenis,

Sulfur-containing nickel phenol phenolates are useful substances. They are described, for example, in U.S. Patent Nos. 2,971,9 ^ 2 and 2,971,9 ^ 1. They consist of nickel salts of bis-phenol sulphides in which only part of the total phenylhydrogen has been replaced by nickel.

A mixture of nickel phenol-phenolate compounds of the above formulas (referred to herein as "mixture A") in which R is an octyl group is a good ultraviolet stabilizer.

To evaluate the effectiveness of the organic sulfur-containing nickel complexes of this invention against ultraviolet dispersion in lubricant media, the following experiment was used: This experiment used a base oil, namely a hydrotreated 100 "hydrocracked oil obtained by removing wax from a base at 385 ° C. 5 60885. The mixtures of the additives and the above-mentioned hydrocracked base oil were tested by exposing 20 g of the test oil in a sealed elongated bottle of about 118 ml to a window facing south-east on a window facing south-east of the suspended, insoluble products. progress from turbidity to suspended flocculation and precipitation, which is usually preceded by turbidity or flocculation and often consists of settled turbidity or flocculation.The results are shown in Table I below, obtained by using 0.1% by weight of additives in the above hydrocracked base oil. It can be seen from the table that the nickel complexes of this invention are much more effective against ultraviolet scattering (Examples 2-3) than the best commercially available conventional antioxidants and ultraviolet light absorbing agents (Examples 4-8).

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The following Table II shows the results obtained using 0.5% by weight of additives in the hydrocracked base oil of Table I described above. Here again, it is noted from the table that when the sulfur-containing nickel complex in the lubricant compositions of this invention is subjected to the experiment described above, it is much more effective against ultraviolet dispersion (Example 2) than the best of the above commercially available conventional antioxidants and ultraviolet light absorbing agents (Example 3-7).

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The following Table III shows the performance of a typical nickel complex of this invention, namely nickel-bis (octylphenyl) sulfide, in a 200 "hydrocracked base oil (base oil 1) and also in another base oil (base oil 2), namely in a heavy vacuum gas oil as shown in the table. the nickel of the invention - (octylphenol) sulfide was significantly effective in reducing the ultaviolet dispersion of both base oils.

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ω 60885

The following Table IV shows the effectiveness of representative nickel complexes of this invention as antioxidants in lubricant compositions. Representative additives were separately mixed with 130 "solvent-purified paraffinic mineral oil and subjected to a standard rotary bomb oxidation test according to ASTM D-22 '(2).

As can be seen from the table, the oxidation life of the base oil was significantly increased by the antioxidant effect of the nickel complexes of this invention.

TABLE IV

Antioxidant effects of nickel complexes

Example Age in a roundabout oxidation test, minutes_ 1 Not at all (base oil) 37 3. 1% mixture A 80

Although the present invention has been described with reference to its preferred compositions and components, those skilled in the art will appreciate that deviation from the preferred embodiments may be made effectively and is within the scope of the specification.

Claims (4)

12 60885 A lubricant mixture comprising an organolickel compound stabilizing against ultraviolet dispersion, characterized in that the nickel compound is a nickel phenol sulfide of the formula Ni (^ 0 ^ Λ V -: - VY [Ni '"H' S '' '"' '"" χΚ RR or RR Π - Q (' "--Ni --OH: i. HO ^ I" OH ö ° —Λ V v RR in which R represents a hydrogen atom or an alkyl group having up to 30 carbon atoms k. A lubricant mixture according to claim 1, characterized in that the nickel compound is present in an amount of about 0.01 to 5% by weight. Lubricant composition according to Claim 2, characterized in that the nickel compound is present in an amount of about 0.1 to 2% by weight. ^. Lubricant mixture according to Claim 1, 2 or 3, characterized in that the lubricant consists of an oil having a lubricating viscosity, a hydrocracked lubricating oil, a hydraulic oil, a mineral oil or a fraction thereof, wax or grease. 1. Smörjmedelkomposition innehällande en mot ultraviolettdegrade-ring stabiliziliserande mängd av en organicisk nickelförening, kän n e-tecknad av att nickelföreningen utgöres av en nickeifenol sulfide med formuleln xi sllA I 1 'v v R R eller en nickelfen X H Ni H R R eller