US2629694A - Grease composition - Google Patents
Grease composition Download PDFInfo
- Publication number
- US2629694A US2629694A US103178A US10317849A US2629694A US 2629694 A US2629694 A US 2629694A US 103178 A US103178 A US 103178A US 10317849 A US10317849 A US 10317849A US 2629694 A US2629694 A US 2629694A
- Authority
- US
- United States
- Prior art keywords
- grease
- oil
- soap
- stearate
- greases
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- C10M5/00—Solid or semi-solid compositions containing as the essential lubricating ingredient mineral lubricating oils or fatty oils and their use
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- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/026—Butene
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- C10M2229/04—Siloxanes with specific structure
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/02—Bearings
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- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
Definitions
- This invention relates to improved lubricating grease compositions. More particularly, this invention pertains to improved grease compositions which are capable of resisting oxidation under both static and dynamic conditions, bleeding, age-hardening and possess outstanding mechanical stability and are thermally reversible.
- Bleeding is another phenomenon which is frequently encountered in grease compositions. Bleeding is primarily due to the fact that the soaps present in grease compositions have a marked tendency to synerize, thereby causing a separation of the soap from the oil or synthetic base lubricant in which it is dispersed.
- this invention comprises a lubricating grease composition containing in addition to the gel-forming agent and/or agents, two particular types of additives in amounts much less than that of the gelling agent used to form the grease; the combination of which produces a synergistic effect resulting in a grease composition possessing the properties enumerated above.
- the two additives are: (a) a high molecular weight organic amine and (b) an organic salt the acid portion of which contains nitrogen, carbon and the elements from the group of oxygen and the elements of the sulfur family, and may be represented by the formula:
- Rf wherein R1 and R2 can be hydrogen and/or an oil-solubilizing organic group such as normal or iso-alkyl; alicyclic, aryl; aralkyl; alkaryl and heterocyclic group; X1 and X2 may be oxygen or an element selected from the sulfur family or mixtures thereof.
- the cationic portion of the molecule may be a monoor polyvalent metal such as Na, K, Li, Ca, Ba, Sr, Mg, Zn, Al, Cu, Co, Sn, Ni and the like.
- the first additive (a), namely, a high molecular weight organic amine, may include the aromatic amines, aliphatic amines, alkylarylamines, cyclic amines, heterocyclic amines and the like and their mixtures.
- amine compounds are applicable as stabilizing agents for metal coating compositions of this invention: paraphenylenediamine, alpha-naphthylamine, orthophenylenediamine, beta naphthylamine, dibeta-naphthyl para-phenylenediamine, amino diphenylamine, meta-to1uylenediamine, 2- amino-1,4-naphthohydroquinone, 4 amino 1,2- naphthohydroquinone, thiodiphenylamine, monobenzyl para-aminophenyl, ZA-diamino toluene, 'ZA-diamino diphenylamine, para-amino ozobenzene, octadecyl benzylamine, beta-phenylaminealpha naphthylamine, phenyl-alpha-naphthylamine, phenyl-beta-naphthylamine, N
- amines which are particularly preferred are: phenyl alpha naphthylamine, phenyl-beta-naphthylamine, beta-phenylaminealpha-naphthylamine, tetra-methyl diamino diphenylmethane, meta-toluylenediamine and their mixtures.
- the carbamates and their derivatives are used in amounts varying from 0.01% to 2% and preferably from 0.1% to 1%.
- lf-he amines are used in amounts varying from 0.01% to 5% and preferably from 0.25% to 2%.
- the ratio of the two additives (a) amine and (b) carbamate can vary over Wide limits of from 1:4 to 4:1, respectively.
- the gelling agent used to form the grease may be soaps of fatty acids and/or their glycerides.
- the saponifiable material may be fatty acids having from 12 to 32 carbon atoms and they may be saturated, unsaturated or polar substituted iatty acids, such as: capric, lauric, myristic, palmitic,-
- acids abietic acids, naphthenic acids, petroleum sulfonic acids and the like.
- a particularly preferred class of saponifiable materials is the hydroxy fatty acids and their glycerides, such as: dimethyl hydroxy caprylic acid, dimethyl hydroxy capric acid, 12-l'iydroxy stearic acid, 9,10-hydroxy-stearic acid, hydroxy 14 and 32 carbon atoms in the molecule.
- their glycerides can. be used such as castor oil, or hydrogenated castor oil or mixtures of free hydroxy fatty acids and their glycerides can be used. Mixtures of hydroxy and non-hydroxy fatty acids can be used to form soap.
- the saponifying agent used to make the soap may be any oxide or hydroxide of one or several of metals selected from groups I, II, III, VI, VII and VIII.
- the cation portion of the soaps may be Na, K, Li, Cs, Ca, Sr, Ba, Cd, Zn,
- acids produced by oxidation of petroleum oil and waxes are included among which are: acids produced by oxidation of petroleum oil and waxes, rosin acids, tall oil.
- soaps can be used to form the grease.
- preferred soaps or mixtures thereof are: lithium stearate, lithium hydroxy stearate, lithium castorate, lithium soap of hydrogenated fish oil fatty acids, lithium soap of mixed stearic and hydroxy stearic acid, sodium stearate, sodium hydroxy stearate, sodium oleate, potassium oleate, potassium rosinate, calcium stearate, calcium hydroxy stearate, aluminum stearate, aluminum soap of fish oil fatty acids, barium hydroxy stearate, barium stearate, sodium sap of mixed stearic and hydroxy stearic acids, lithium soap of mixed oleic and hydroxy stearic acid, aluminum castorate, mixed soaps of lithium stearate and sodium stearate, mixed soaps of lithium hydroxy stearate and sodium stearate, mixed soaps of lithium hydroxy stearate and calcium stearate, etc.
- soaps and other gelling agents such as organic or inorganic aerogels, e. g. silica aerogels, can be used or aerogels can replace the soap entirely as the gelling agent.
- organic or inorganic aerogels e. g. silica aerogels
- the soap content of grease compositions of this invention may vary over wide limits and may be as high as 50%. In practice, grease compositions of this invention containing from 5 to by weight of soap.
- the grease-forming lubricant bases used in preparing the greases of the persent invention may vary widely in character and include mineral oil of wide viscosity, the range varying from about 150 SUV at 100 F. to about 2000 SUV at 100 F.
- the viscosity index of the oil can vary from below zero to about 100 and have an average molecular weight ranging from about 250 to about 600. It may be highly refined and solvent treated, if desired, by any known means.
- a preferred mineral oil is one which has a viscosity of 300 to 700 SUS at 100 F., a viscosity index of from 40 to 70 and an average molecular weight of 350 to 750.
- synthetic oils and lubricants may be substituted in part or wholly for the mineral oil.
- synthetic lubricants which can be used are: polymerized olefins; copolymers of alkylene glycols and alkylene oxides; organic esters, e. g., Z-ethyl-hexyl sebacate, dioctyl phthalate, trioctyl phosphate; polymeric tetrahydrofuran; polyalkyl silicon polymers, e. g., dimethyl silicon polymer, etc.
- minor amounts of a fixed oil such as castor oil, lard oil, etc., may be admixed with the hydro- Preferred Range General Range 0.01 to 2--- 0.01 to 5.
- Ca octyl phenolformaldehyde condensation product Base (mineral oil and/or synthetic oil)- 0 t0 2 Balance--- 0. l-l Balance Greases of this invention may be made by conventional or special methods and either by the batch or continuous process.
- lithium soap grease made by the conventional method a calculated amount of lithium soap of between about 5 and 25% and higher is charged into a suitable grease kettle together with about half of the required amount of oil.
- the oil-soap mixture is heated to around about 350 to 450 F. under agitation until a homogeneou mass is obtained. The balance of the oil is then slowly added with stirring.
- Grease compositions of this invention were compared withgreasesiin which one of 'theiadditive components was omitted by subjecting them to 'theperformance'test of'the Army-Navy Aeronautical Specification AN-G-a, and the results were as follows:
- Composition 1 1A 1B Llsteerate Phenyl-alpha-naphthylainirie. '0J25 0. Zn dibutyl dithiocarbamate. 1.0 1. 0 Mid-Cont. oil, 400 SUS at 100.... Balance Balance Balance (Oxidation Tests Results Time for 5 lb. pressure drop (hrs.)) 500 20 (High' speed, high temperature ball bearing performance test (hrs.)) 300 176 Composition 2A Formulae, percent wt.:
- condensation product a "Mineral oil .(85 SUS at 210 naphthenic oil) .r
- 'Minor amount of secondary additives can be "admixed With greases of this invention such as extreme pressure agents can be added to such greases and the preferred comprise esters of phosphorus acids such as triaryl, alkylhydroxy, ary, or aralkyl phosphates, thiophosphates or phosphites, etc.;n'eutral aromatic sulfur compounds such as diaryl sulfides and polysulfides, e.
- esters of phosphorus acids such as triaryl, alkylhydroxy, ary, or aralkyl phosphates, thiophosphates or phosphites, etc.
- n'eutral aromatic sulfur compounds such as diaryl sulfides and polysulfides, e.
- sperm oil, jojoba oil, -etc. in which the sulfur is tightly bound; sulfurized-long-chain olefins obtained by dehydrogenationorcracking of wax; sulfurized phosphorized fatty oils, acids, esters andketones, phosphorus acid esters having sulfurized organic radicals, such as esters of phosphoric or phosphorus acids with hydroxy fattyacids; chlorinated hydrocarbons such as chlorinated paraifins, aromatic hydrocarbons, terpenes, mineral lubricating oils, etc.; or chlorinated ester of fatty acids containing the chlorine in positions other than alpha position.
- kylphenol-aldehyde condensation e. g., Ca octylphenol formaldehyde condensation product, Ca diwaxphenol sulfide, .urea or thiourea derivatives, e. g., :urethanes, allophanates, carbazides, carbazones,etc.; or rubber, polyisobutylene, polyvinyl esters, esters of fatty acids, e. g., butyl stearate, etc.
- VI improvers such aspolyisobutylene having a molecular weight above about 800, volatilized parafiin wax, unsaturated polymerized esters of fatty acids .and monohydric alcohols, etc.; antioxidants, e. g.,, alkyl phenols; oiliness agents such as stearic and oleic .acids and pour point depressors suchas chlorinated naphthalene to further lower the pourpoint of the lubricant.
- antioxidants e. g., alkyl phenols
- oiliness agents such as stearic and oleic .acids
- pour point depressors such as chlorinated naphthalene to further lower the pourpoint of the lubricant.
- the amount of the :above additives can be added to grease compositions of this inventionin around about 0.01% to less than 10% by Weight, and preferably'dl .to 5.0% by weight.
- a grease composition comprising a major amount of mineral lubricating .oil having incor porated therein an amount sufiicient to forma grease of lithium soap and from about 0.01 to 5% of .an oil-soluble aryl amine and from about 0.1 to 2% of .an oil-soluble polyvalentmetal salt of an alkyl dithiocarbamic acid.
- a grease composition comprising .a major amount of mineral lubricating oil having incorporated therein an amount sufiicient to form "a grease of a sodium soap "and from about 0.01 to 5% of an oil-soluble aryl amine and from about 0.1 to 2% of an oil-soluble p'olyvalentmetal salt of an alkyl dithiocarbamic acid.
- a grease composition comprising a :major amount of mineral lubricating oil having incorporated therein an amount sufficient to form :a grease of a lithium stearate and from 0.25 to 1% of phenyl-alpha-naphthylamine and from 0.1 to 1.5% of zinc dibutyl dithiocarbamate.
- a grease composition comprising a major amount of mineral lubricating oilhaving incorporated therein an amount sufficient to form a grease of sodium stearate and from 0.25 to 1% of phenyl-alpha naphthylamine and from 0.1 to 1.5% of .zinc dibutyl dithiocarbamate.
- a grease composition comprising a major amount of mineral lubricating oil having incor-- porated therein an amount sufiicient to form a grease of lithium stearate and from 0.25 to 1% of p-henyl-alpha-naphthylamine and from 0.1 to 1.5% of zinodihexyl dithiocarbamate.
- a grease composition comprising a, major amount of mineral lubricating oil having incorporated therein an amount sumcient to form a grease of sodium stearate and from 0.25 to 1% of pheny'halpha-nap-hthylamine and from 0.1 to 1.5% of zinc dihexyl dithiocarbamate.
- a grease composition comprising a major amount of mineral lubricating oil having incorporated therein inan amount sufiicient to form a grease of lithium IZ-hydroxy stearate and from 0.25 to 1% of phenyl-alpha-naphthylamine and from 0.1 to 1.5% of zinc .dibutyl dithiocarbamate.
- a grease composition comprising a major amount of a lubricating oil having incorporated therein a minor amount of an alkali metal soap and from about 0:01 to5% of an oil-soluble aryl amine and from about 0.01 'to 2% of an oil-soluble polyvalent metal salt of an alkyl dithiocarbamic acid.
- a grease composition comprising the following ingredients in the following proportions:
Description
Patented Feb. 24, 1953 GREASE COMPOSITION Harold A. Woods and John A. Edgar, Martinez,
Calif., assignors to Shell Development Company, San Francisco, Calif., a corporation of Delaware No Drawing. Application July 5, 1949, Serial No. 103,178
9 Claims.
This invention relates to improved lubricating grease compositions. More particularly, this invention pertains to improved grease compositions which are capable of resisting oxidation under both static and dynamic conditions, bleeding, age-hardening and possess outstanding mechanical stability and are thermally reversible.
, It is well established that oxidation has a profound deteriorating efiect upon lubricants and lubricating compositions. The rapidity of this deterioration varies with different lubricants and depends in part upon the source of the base oil, the presence of additives therein as well as on the conditions to which the lubricant is exposed. Once oxidation has started in a lubricant, the deterioration caused thereby appears to be an autocatalytic phenomenon which results in further deterioration of the lubricant.
A general deficiency encountered in greases is their lack of resistance to shear as well as other types of mechanical forces which are generally exerted upon greases under various working conditions. Thus, in the lubrication of ball and roller bearings, greases are often subjected to temperatures in excess of 250 to 300 F., which temperatures accelerate oxidation and coupled with high shearing stresses, the greases break down in structure and are incapable of adhering to the lubricating surfaces, resulting in bearing corrosion, wear and failure. It is essential of good greases, therefore, to resist shearing stresses and oxidation, particularly over wide temperature ranges.
The cause or causes of age-hardening of greases at present is not understood. It is believed to be caused by the soap fibers which in storage tend to form cross layers due to the presence of an active group associated with the soap micelles, and thereby increases the consistency of the grease. Such hardening is extremely undesirable for it introduces numerous lubricating difficulties such as in pumping equipment and the like.
Bleeding is another phenomenon which is frequently encountered in grease compositions. Bleeding is primarily due to the fact that the soaps present in grease compositions have a marked tendency to synerize, thereby causing a separation of the soap from the oil or synthetic base lubricant in which it is dispersed.
Generally, to inhibit bleeding and improve the texture of greases special precautionary measures are taken, such as employing slow or rapid means of cooling, or extensively working the grease in special homogenizers, e. g., the Cornell homogenizer and the like. Such procedures are usually time-consuming and add to the cost of the grease. Other ways of producing stable, nonbleeding greases have been attempted by either reducing the soap content generally to less than about 5% by weight or by increasing the soap content to a maximum. These methods of stabilizing greases against bleeding have also proved to be unsatisfactory because in the case of reducing the soap content to less than 5% such greases become limited in their use due to the low soap content, while increasing the soap content to a maximum makes the grease too costly and such products generally possess an undesired consistency.
It is an object of this invention to produce grease compositions having outstanding mechanical stability under dynamic and static conditions. It is another object of this invention to produce greases having good thermal reversibility and which are capable of resisting shearing stresses over wide temperature ranges. Still another object of this invention is to produce non-bleeding greases. Still another object of this invention is to produce novel greases of this invention by conventional grease-making techniques either by batch or continuous processes. Furthermore, it is an object of this invention to produce a multi-p-urpose grease of outstanding lubricating properties.
These and other objects of this invention will be apparent from the following description and the appended claims.
Broadly stated, this invention comprises a lubricating grease composition containing in addition to the gel-forming agent and/or agents, two particular types of additives in amounts much less than that of the gelling agent used to form the grease; the combination of which produces a synergistic effect resulting in a grease composition possessing the properties enumerated above. The two additives are: (a) a high molecular weight organic amine and (b) an organic salt the acid portion of which contains nitrogen, carbon and the elements from the group of oxygen and the elements of the sulfur family, and may be represented by the formula:
Rf wherein R1 and R2 can be hydrogen and/or an oil-solubilizing organic group such as normal or iso-alkyl; alicyclic, aryl; aralkyl; alkaryl and heterocyclic group; X1 and X2 may be oxygen or an element selected from the sulfur family or mixtures thereof. The cationic portion of the molecule may be a monoor polyvalent metal such as Na, K, Li, Ca, Ba, Sr, Mg, Zn, Al, Cu, Co, Sn, Ni and the like.
The first additive (a), namely, a high molecular weight organic amine, may include the aromatic amines, aliphatic amines, alkylarylamines, cyclic amines, heterocyclic amines and the like and their mixtures. The following amine compounds are applicable as stabilizing agents for metal coating compositions of this invention: paraphenylenediamine, alpha-naphthylamine, orthophenylenediamine, beta naphthylamine, dibeta-naphthyl para-phenylenediamine, amino diphenylamine, meta-to1uylenediamine, 2- amino-1,4-naphthohydroquinone, 4 amino 1,2- naphthohydroquinone, thiodiphenylamine, monobenzyl para-aminophenyl, ZA-diamino toluene, 'ZA-diamino diphenylamine, para-amino ozobenzene, octadecyl benzylamine, beta-phenylaminealpha naphthylamine, phenyl-alpha-naphthylamine, phenyl-beta-naphthylamine, N,N'-dibutyl para-phenylenediamine, tetramethyl diaininodiphenylmethane, p,p'diamino-diphenylmethane, 4,4-diamino-diphenylmethane, tetraethyl diamino diphenylmethane, diisoamyl diamino diphenylmethane, bis (beta naphthyl amino methyl) -p-tert-amyl-phenol; 3,3,5-tricyclohexylamine, dicyclohexylamine; N-phenyl morpholine, N-(para-hydroxyphenyl) morpholine; octadecyl 3-methyl-2-pentylamine, N-octadecyl-2-ethylhexylamine, hexadecylamine, octadecylamine, octadenylamine, octadecadienylamine, parafiin waxamine, cocoamine prepared from cocoanut oil acids, N,N'-dimethyl triglycoldiamine; disalicylal ethylenediamine; N-salicylal-N'-ethanol-ethylenediamine; S-methyLZA-diamino anisole; ketone diarylamine, ketone amine; ketone amine condensation products; butyraldehyde aniline derivatives; condensation products of acetone and aniline, reaction products of acetone and paraamino diphenyl. In addition to the above amine compounds the following mixtures of amines produce good stabilizers. Mixtures of diphenyl paraphenylenediamine and isopropoxy-diphenylamine, phenyl-alpha-naphthylamine and metatoluylenediamine, mixture of di-para-methoxy diphenylamine, diphenylamine, diphenyl paraphenylenediamine and phenyl-betanap-hthylamine, mixtures of phenyl-beta-naphthylamine and meta-toluylenediamine mixture of di-phenyl para-phenylenediamine and para-phenylenediamine, mixture of stearic acid, meta-toluylenediamine and phenyl-alpha-naphthylamine, mixture of ditolylamine and petroleum wax and the like. The amines which are particularly preferred are: phenyl alpha naphthylamine, phenyl-beta-naphthylamine, beta-phenylaminealpha-naphthylamine, tetra-methyl diamino diphenylmethane, meta-toluylenediamine and their mixtures.
The second additive (b) as, defined above and the acid portion of which has been represented by the general formula:
can be exemplified by such specific compounds as:
Ca, Ba, Na, Zn, Cu, Ni, salts of dibutyl monoand dithiocarbamic acid Na, Ca, Zn, Cu, Ni, salts of diethyl monoand dithiocarbamic acid Na, Ca, Zn, Cu, Ni, Co, salts of diamyl monoand dithiocar-bamic acid Na, Ca, Zn, Cu, Ni, Co, salts of dihexyl monoand dithiocarbamic acid Na, Ca, Zn, salts of dioctyl monoand dithiocarbamic acid Ca, Zn, Cu, Ni, salts of N-ethyl-l -phenyl monoand dithiocarbamic acid Ba, Ca, Zn, Na, salts of dicyclohexylmonoand dithiocarhamic acid ZJi-di- Zn, Ca, salts of monocetyl monoand; dithiocarbamic acid Zn, Ca, Ni, salts of di(cetyl phenyl) monoand dithiocarbamic acid Sr, Zn, Li, salts of dibenzyl monoand dithiocarbamic acid Zn and Ni salts of di(amyl piperidyl) monoand dithiocarbamic acid Zn, Ca, Na, salts of dihexyl monoand diselenocarbamic acid Zn salt of dicyclohexyl monoand diselenocarbamic acid Na, Zn, Ni, Cu, salts of dibutyl carbamic acid Na, Ca, Zn, salts of dihexyl carbamic acid Ca and Zn salts of dicyclohexyl carbamic acid Co salts of monocetyl carbamic acid Zn salts of dibenzyl carbamic acid The amount of both the amine or the carbamate which can be added to grease compositions of this invention depends upon various factors such as the lubricating base used to form the grease, the amount and type of soap and/or other gelling agents and the like. Generally, the carbamates and their derivatives are used in amounts varying from 0.01% to 2% and preferably from 0.1% to 1%. lf-he amines are used in amounts varying from 0.01% to 5% and preferably from 0.25% to 2%. Depending upon the type of grease produced, the ratio of the two additives (a) amine and (b) carbamate can vary over Wide limits of from 1:4 to 4:1, respectively.
The gelling agent used to form the grease may be soaps of fatty acids and/or their glycerides. The saponifiable material may be fatty acids having from 12 to 32 carbon atoms and they may be saturated, unsaturated or polar substituted iatty acids, such as: capric, lauric, myristic, palmitic,-
stearic, arachidic, behenic, lignoceric, myristoleic acids, cottonseed oil fatty acid, palm oil fatty acids, linoleic, hydrogenated fish oil fatty acids, palmitoleic, oleic, linoleic, ricinoleic, erucic acids and their mixtures and/or their glycerides, such as lard, beef, rapeseed, palm, menhaden, herring oils, etc.
acids, abietic acids, naphthenic acids, petroleum sulfonic acids and the like.
A particularly preferred class of saponifiable materials is the hydroxy fatty acids and their glycerides, such as: dimethyl hydroxy caprylic acid, dimethyl hydroxy capric acid, 12-l'iydroxy stearic acid, 9,10-hydroxy-stearic acid, hydroxy 14 and 32 carbon atoms in the molecule. Instead of using the free fatty acids containing a hy-' droxy radical, their glycerides can. be used such as castor oil, or hydrogenated castor oil or mixtures of free hydroxy fatty acids and their glycerides can be used. Mixtures of hydroxy and non-hydroxy fatty acids can be used to form soap.
The saponifying agent used to make the soap may be any oxide or hydroxide of one or several of metals selected from groups I, II, III, VI, VII and VIII. Specifically, the cation portion of the soaps may be Na, K, Li, Cs, Ca, Sr, Ba, Cd, Zn,
Al, Pb and Co. Mixtures of. soaps can be. used,
and the soap can be made in situ or pre-made Other acids may be included among which are: acids produced by oxidation of petroleum oil and waxes, rosin acids, tall oil.
soaps can be used to form the grease. Specific examples of preferred soaps or mixtures thereof are: lithium stearate, lithium hydroxy stearate, lithium castorate, lithium soap of hydrogenated fish oil fatty acids, lithium soap of mixed stearic and hydroxy stearic acid, sodium stearate, sodium hydroxy stearate, sodium oleate, potassium oleate, potassium rosinate, calcium stearate, calcium hydroxy stearate, aluminum stearate, aluminum soap of fish oil fatty acids, barium hydroxy stearate, barium stearate, sodium sap of mixed stearic and hydroxy stearic acids, lithium soap of mixed oleic and hydroxy stearic acid, aluminum castorate, mixed soaps of lithium stearate and sodium stearate, mixed soaps of lithium hydroxy stearate and sodium stearate, mixed soaps of lithium hydroxy stearate and calcium stearate, etc.
Instead of using only soaps as the gelling agent mixtures of soaps and other gelling agents, such as organic or inorganic aerogels, e. g. silica aerogels, can be used or aerogels can replace the soap entirely as the gelling agent.
The soap content of grease compositions of this invention may vary over wide limits and may be as high as 50%. In practice, grease compositions of this invention containing from 5 to by weight of soap.
The grease-forming lubricant bases used in preparing the greases of the persent invention may vary widely in character and include mineral oil of wide viscosity, the range varying from about 150 SUV at 100 F. to about 2000 SUV at 100 F. The viscosity index of the oil can vary from below zero to about 100 and have an average molecular weight ranging from about 250 to about 600. It may be highly refined and solvent treated, if desired, by any known means. A preferred mineral oil is one which has a viscosity of 300 to 700 SUS at 100 F., a viscosity index of from 40 to 70 and an average molecular weight of 350 to 750. Instead of using straight mineral oil as the base, synthetic oils and lubricants may be substituted in part or wholly for the mineral oil. Among the synthetic lubricants which can be used are: polymerized olefins; copolymers of alkylene glycols and alkylene oxides; organic esters, e. g., Z-ethyl-hexyl sebacate, dioctyl phthalate, trioctyl phosphate; polymeric tetrahydrofuran; polyalkyl silicon polymers, e. g., dimethyl silicon polymer, etc. Under some conditions of lubrication, minor amounts of a fixed oil such as castor oil, lard oil, etc., may be admixed with the hydro- Preferred Range General Range 0.01 to 2--- 0.01 to 5.--
Gelling agent, g., soaps, aerogels, etc.-. Primary Additives:
Carbamates and their thio derivatives. Amine Secondary Additives:
Ca octyl phenolformaldehyde condensation product Base (mineral oil and/or synthetic oil)- 0 t0 2 Balance--- 0. l-l Balance Greases of this invention may be made by conventional or special methods and either by the batch or continuous process. In the case of lithium soap grease made by the conventional method a calculated amount of lithium soap of between about 5 and 25% and higher is charged into a suitable grease kettle together with about half of the required amount of oil. The oil-soap mixture is heated to around about 350 to 450 F. under agitation until a homogeneou mass is obtained. The balance of the oil is then slowly added with stirring. Stirring is continued until a homogeneous mass is formed at which point the grease is allowed to cool either in the grease kettle or in pans to the ambient temperature. The grease thus formed is generally lumpy and requires reworking by milling or homogenizing to produce a smooth and relatively stable grease. If soda soap or alkaline earth greases are made, they may be cooled slowly in the kettle; whereas if lithium or aluminum soap greases of this invention are made, it is preferred that they be cooled uniformly and rapidly either in tubes of small diameter or in their layers by feeding the hot grease onto a steel belt and subjecting the grease to a current of air or other cooling medium, so as to cool the grease in a uniform fashion free from shearing stresses. The primary additives and, if desired, the secondary additives, can be added to the grease at any convenient time. A preferred time for adding the additives of this invention is while the grease is in a hot liquid state.
The following table illustrates specific grease compositions of this invention, each component of which may be used in the range indicated above in the general formulations.
Components:
%i stegrae .Eun
il2- y roxy s eara e Li soap of hydrogenated fish O11 Ca stearate Ca soap of tallow and beg fat" Ba stearate Al stearate Zn dibutyl dithiocarbarna Zn-dihexyl dithiocarbamate- Zn dibenzyl dithiocarbamate. Zn dihexyl monothiocarbamate.. Ca dibutyl dithiocarbamate Zn dicyclohexyl dithiocarbarna Zn dicyclohexyl carbamate. Phenyl-alpha-naphthylamine. Phenyl-beta-naphthylamme. Ca octylphenol-formaldehyde condensation product 2, 4-Dibutyl-6-methylphenol Mineral 'l Dioctyl sebacatem.
Grease compositions of this invention were compared withgreasesiin which one of 'theiadditive components was omitted by subjecting them to 'theperformance'test of'the Army-Navy Aeronautical Specification AN-G-a, and the results were as follows:
Composition 1 1A 1B Llsteerate Phenyl-alpha-naphthylainirie. '0J25 0. Zn dibutyl dithiocarbamate. 1.0 1. 0 Mid-Cont. oil, 400 SUS at 100.... Balance Balance Balance (Oxidation Tests Results Time for 5 lb. pressure drop (hrs.)) 500 20 (High' speed, high temperature ball bearing performance test (hrs.)) 300 176 Composition 2A Formulae, percent wt.:
Sodium Soap- Hydrogenated castor oil, .10
Stearic acid, 40 27.5% wt. Beef tallow fatty acids, .50 Phenylalpha-naphtllylamine 0.5% Wt. .Zn dioutyl dithiocarbamate 0.5% wt.
la salt oioctyl phenoltormaldehyde.
condensation product a "Mineral oil .(85 SUS at 210 naphthenic oil) .r
Test Results:
Worked penetration, ASTM SpeC. AN G5a.performance, hours 0.5% sulfated ash.
Balance.
The synergistic efiects which are obtained by the combination of'the'two additive agents of this invention are illustrated by subjecting a lithium stearate grease to a modified Dornte oxidation test using an iron Wire catalyst at 300 F. The results were as follows:
'Minor amount of secondary additives can be "admixed With greases of this invention such as extreme pressure agents can be added to such greases and the preferred comprise esters of phosphorus acids such as triaryl, alkylhydroxy, ary, or aralkyl phosphates, thiophosphates or phosphites, etc.;n'eutral aromatic sulfur compounds such as diaryl sulfides and polysulfides, e. g., diphenyl sulfide, dicresol sulfide, dibenzyl sulfide, methyl butyl diphenol sulfide, etc., diphenyl selenide and diselenide; dicresol selenide and polyselenide, etc.; sulfurized fatty oils or esters of fatty acids and 'monohydric alcohols, e. g., sperm oil, jojoba oil, -etc., in which the sulfur is tightly bound; sulfurized-long-chain olefins obtained by dehydrogenationorcracking of wax; sulfurized phosphorized fatty oils, acids, esters andketones, phosphorus acid esters having sulfurized organic radicals, such as esters of phosphoric or phosphorus acids with hydroxy fattyacids; chlorinated hydrocarbons such as chlorinated paraifins, aromatic hydrocarbons, terpenes, mineral lubricating oils, etc.; or chlorinated ester of fatty acids containing the chlorine in positions other than alpha position.
Additional ingredients which can be added are kylphenol-aldehyde condensation, e. g., Ca octylphenol formaldehyde condensation product, Ca diwaxphenol sulfide, .urea or thiourea derivatives, e. g., :urethanes, allophanates, carbazides, carbazones,etc.; or rubber, polyisobutylene, polyvinyl esters, esters of fatty acids, e. g., butyl stearate, etc. VI improvers-such aspolyisobutylene having a molecular weight above about 800, volatilized parafiin wax, unsaturated polymerized esters of fatty acids .and monohydric alcohols, etc.; antioxidants, e. g.,, alkyl phenols; oiliness agents such as stearic and oleic .acids and pour point depressors suchas chlorinated naphthalene to further lower the pourpoint of the lubricant.
The amount of the :above additives can be added to grease compositions of this inventionin around about 0.01% to less than 10% by Weight, and preferably'dl .to 5.0% by weight.
:Grease .of this invention are applicable for general automotive uses and are excellent aircraft greases, industrial greases and the like.
This application is a continuation-in-partof our co-pending application Serial No. 93,635, filed May 16,1949.
We claim as ourinvention:
l. A grease composition comprising a major amount of mineral lubricating .oil having incor porated therein an amount sufiicient to forma grease of lithium soap and from about 0.01 to 5% of .an oil-soluble aryl amine and from about 0.1 to 2% of .an oil-soluble polyvalentmetal salt of an alkyl dithiocarbamic acid.
2. A grease composition comprising .a major amount of mineral lubricating oil having incorporated therein an amount sufiicient to form "a grease of a sodium soap "and from about 0.01 to 5% of an oil-soluble aryl amine and from about 0.1 to 2% of an oil-soluble p'olyvalentmetal salt of an alkyl dithiocarbamic acid.
3. A grease composition comprising a :major amount of mineral lubricating oil having incorporated therein an amount sufficient to form :a grease of a lithium stearate and from 0.25 to 1% of phenyl-alpha-naphthylamine and from 0.1 to 1.5% of zinc dibutyl dithiocarbamate.
4. A grease composition comprising a major amount of mineral lubricating oilhaving incorporated therein an amount sufficient to form a grease of sodium stearate and from 0.25 to 1% of phenyl-alpha naphthylamine and from 0.1 to 1.5% of .zinc dibutyl dithiocarbamate.
5. A grease composition comprising a major amount of mineral lubricating oil having incor-- porated therein an amount sufiicient to form a grease of lithium stearate and from 0.25 to 1% of p-henyl-alpha-naphthylamine and from 0.1 to 1.5% of zinodihexyl dithiocarbamate.
6. A grease composition comprising a, major amount of mineral lubricating oil having incorporated therein an amount sumcient to form a grease of sodium stearate and from 0.25 to 1% of pheny'halpha-nap-hthylamine and from 0.1 to 1.5% of zinc dihexyl dithiocarbamate.
7. A grease composition comprising a major amount of mineral lubricating oil having incorporated therein inan amount sufiicient to form a grease of lithium IZ-hydroxy stearate and from 0.25 to 1% of phenyl-alpha-naphthylamine and from 0.1 to 1.5% of zinc .dibutyl dithiocarbamate.
8. A grease composition comprising a major amount of a lubricating oil having incorporated therein a minor amount of an alkali metal soap and from about 0:01 to5% of an oil-soluble aryl amine and from about 0.01 'to 2% of an oil-soluble polyvalent metal salt of an alkyl dithiocarbamic acid.
9. A grease composition comprising the following ingredients in the following proportions:
Li stearate 20 Phenyl-a1pha-naphthylamine 0.25 Zn dibutyl dithiocarbamate 1.0 Mineral lubricating oil Balance HAROLD A. WOODS. JOHN A. EDGAR.
10 REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS
Claims (1)
- 8. A GREASE COMPOSTION COMPRISING A MAJOR AMOUNT OF A LUBRICATING OIL HAVING INCORPORATED THEREIN A MINOR AMOUNT OF AN ALKALI METAL SOAP AND FROM ABOUT 0.01 TO 5% OF AN OIL-SOLUBLE ARYL AMINE AND FROM ABOUT 0.01 TO 2% OF AN OIL-SOLUBLE POLYVALENT METAL SALT OF AN ALKYL DITHIOCARBAMIC ACID.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US103178A US2629694A (en) | 1949-07-05 | 1949-07-05 | Grease composition |
GB16692/50A GB693697A (en) | 1949-07-05 | 1950-07-04 | Improvements in and relating to lubricating greases |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US103178A US2629694A (en) | 1949-07-05 | 1949-07-05 | Grease composition |
Publications (1)
Publication Number | Publication Date |
---|---|
US2629694A true US2629694A (en) | 1953-02-24 |
Family
ID=22293802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US103178A Expired - Lifetime US2629694A (en) | 1949-07-05 | 1949-07-05 | Grease composition |
Country Status (2)
Country | Link |
---|---|
US (1) | US2629694A (en) |
GB (1) | GB693697A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2784219A (en) * | 1954-03-23 | 1957-03-05 | Monsanto Chemicals | Stabilization of unsaturated nitriles |
US2836561A (en) * | 1954-05-17 | 1958-05-27 | Wakefield & Co Ltd C C | Lubricating oils |
US2856363A (en) * | 1955-12-01 | 1958-10-14 | Pure Oil Co | Stable anti-rust lubricating oil |
US2921902A (en) * | 1957-06-03 | 1960-01-19 | Texaco Inc | Lubricating composition containing a synergistic extreme pressure additive |
US2957826A (en) * | 1958-09-22 | 1960-10-25 | Pure Oil Co | Grease composition thickened with a metal n-substituted carbamate |
US2999813A (en) * | 1956-12-18 | 1961-09-12 | Texaco Inc | Lubricant comprising a sulfurized mineral oil and a polyvalent metal dithiocarbamate |
US3037997A (en) * | 1956-10-12 | 1962-06-05 | Olin Mathieson | Lead salts of substituted propionic acid |
US3244627A (en) * | 1962-01-23 | 1966-04-05 | Monsanto Res Corp | Functional fluid compositions |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL100159C (en) * | 1955-02-25 | |||
DE1260861B (en) * | 1962-04-30 | 1968-02-08 | Esso A G | Lubricating oil-fuel mixtures for two-stroke internal combustion engines |
KR100296478B1 (en) * | 1997-03-26 | 2001-10-25 | 포만 제프리 엘 | Improved Spindle Motor |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2024990A (en) * | 1932-12-07 | 1935-12-17 | Texas Co | Lubricant |
US2197433A (en) * | 1939-02-03 | 1940-04-16 | Gulf Research Development Co | Stabilized grease lubricant |
US2332825A (en) * | 1941-10-21 | 1943-10-26 | Jasco Inc | Lubricant |
US2363012A (en) * | 1942-05-06 | 1944-11-21 | Standard Oil Co California | Compounded mineral oil |
US2504672A (en) * | 1948-11-01 | 1950-04-18 | California Research Corp | Lithium grease |
US2515133A (en) * | 1948-06-30 | 1950-07-11 | Standard Oil Dev Co | Lubricating grease |
-
1949
- 1949-07-05 US US103178A patent/US2629694A/en not_active Expired - Lifetime
-
1950
- 1950-07-04 GB GB16692/50A patent/GB693697A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2024990A (en) * | 1932-12-07 | 1935-12-17 | Texas Co | Lubricant |
US2197433A (en) * | 1939-02-03 | 1940-04-16 | Gulf Research Development Co | Stabilized grease lubricant |
US2332825A (en) * | 1941-10-21 | 1943-10-26 | Jasco Inc | Lubricant |
US2363012A (en) * | 1942-05-06 | 1944-11-21 | Standard Oil Co California | Compounded mineral oil |
US2515133A (en) * | 1948-06-30 | 1950-07-11 | Standard Oil Dev Co | Lubricating grease |
US2504672A (en) * | 1948-11-01 | 1950-04-18 | California Research Corp | Lithium grease |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2784219A (en) * | 1954-03-23 | 1957-03-05 | Monsanto Chemicals | Stabilization of unsaturated nitriles |
US2836561A (en) * | 1954-05-17 | 1958-05-27 | Wakefield & Co Ltd C C | Lubricating oils |
US2856363A (en) * | 1955-12-01 | 1958-10-14 | Pure Oil Co | Stable anti-rust lubricating oil |
US3037997A (en) * | 1956-10-12 | 1962-06-05 | Olin Mathieson | Lead salts of substituted propionic acid |
US2999813A (en) * | 1956-12-18 | 1961-09-12 | Texaco Inc | Lubricant comprising a sulfurized mineral oil and a polyvalent metal dithiocarbamate |
US2921902A (en) * | 1957-06-03 | 1960-01-19 | Texaco Inc | Lubricating composition containing a synergistic extreme pressure additive |
US2957826A (en) * | 1958-09-22 | 1960-10-25 | Pure Oil Co | Grease composition thickened with a metal n-substituted carbamate |
US3244627A (en) * | 1962-01-23 | 1966-04-05 | Monsanto Res Corp | Functional fluid compositions |
Also Published As
Publication number | Publication date |
---|---|
GB693697A (en) | 1953-07-08 |
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