CN106604981B - Lubricant compositions for improved thermo-oxidative stability and color stability - Google Patents
Lubricant compositions for improved thermo-oxidative stability and color stability Download PDFInfo
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Abstract
A lubricant composition for improving thermo-oxidative stability and color stability comprising 0.01 to 3.0 wt.% of a secondary antioxidant and 0.01 to 5.0 wt.% of a polyalkylene glycol, based on the total weight of the lubricant composition, wherein the lubricant composition has a total acid value change of less than 5% based on ASTM D664, and a color stability of L of 0.5 to 3.5 or less based on ASTM D1500.
Description
Technical Field
The present invention relates to lubricant compositions for improved thermo-oxidative stability and color stability. More particularly, the present invention relates to lubricant compositions for improved thermo-oxidative stability and color stability comprising a defined amount of an auxiliary oxidative stabilizer and a polyalkylene glycol.
Background
With the trend of reducing the size and energy and increasing the speed of various machines including hydraulic devices, the load of oil used in these machines is gradually increasing, and consumers' demand for stable and safe use of such machines for a long period of time is increasing. To this end, various methods of increasing the oxidative stability of oils have been developed to meet consumer reliability requirements.
With regard to a method for improving oxidation stability and reliability, U.S. Pat. No. 7799101 discloses a lubricant composition for use in an environment where iron catalytic oxidation occurs, comprising a specific organic phosphite and an aromatic secondary amine antioxidant and/or a phenolic antioxidant. In addition, japanese patent application laid-open No.1994-004865 discloses a lubricant additive composition comprising a specific color stabilizer comprising a zinc salt of dialkyl ester of dithiophosphoric acid and trialkylphosphine, wherein the zinc salt of dialkyl ester of dithiophosphoric acid is used to improve color stability, but does not mention color stability of the final lubricant product.
Although conventional methods of improving oxidation stability and/or other properties by varying antioxidants and/or additives and combinations thereof have been proposed to improve reliability, the properties of these methods are still insufficient and it is difficult to meet higher demands of consumers. Therefore, in order to stably enhance the reliability of exhibiting the above-described properties over a long period of time, a new method of improving the thermal oxidation stability of a lubricant and further improving its color stability upon oxidation is required.
Consumers who actually use lubricants consider the change in color of lubricants to be a key criterion, and the change in color of lubricants is essentially regarded in the market as a very important factor for verifying the quality of products. Although the initial color of the oil is important, the quality of the oil depends on the degree to which the color of the oil changes during its use. This color change may not be accurate based on actual objective performance test criteria, but is an important quality issue for consumers because it is considered a long-term consumer use criterion. Therefore, continuous attempts have been made to develop products that meet the quality standards for long-term use by consumers, but in practice they are difficult to work with and do not produce sufficient effects. Thus, there is an urgent need to develop a technology capable of manufacturing products with further improved color stability so as to exhibit good color stability over a long period of time and also exhibit significantly improved thermo-oxidative stability.
Disclosure of Invention
Technical problem
In the present invention, the present inventors have conducted intensive studies in order to solve the problems encountered in the prior art, and as a result, have found that the use of a secondary antioxidant and a polyalkylene glycol results in a significant improvement in the thermo-oxidative stability and color stability of a lubricant.
Accordingly, it is an aspect of the present invention to provide a lubricant composition that may simultaneously include a secondary antioxidant and a polyalkylene glycol, thereby exhibiting excellent thermo-oxidative stability and color stability.
Specifically, the lubricant compositions are significantly effective in exhibiting thermo-oxidative stability, which exhibits a Total Acid Number (TAN) change of less than 5% (ASTM D664) in the Cincinnati Milacron thermal stability test (ASTM D2070), and color stability, which exhibits a L in the range of 0.5 to 3.5 or less (ASTM D1500).
Aspects of the present invention are not limited to the above, and other aspects not mentioned herein will be clearly understood by those skilled in the art from the following description.
Solution to the problem
One aspect of the present invention provides a lubricant composition for improving thermo-oxidative stability and color stability comprising 0.01 to 3.0 wt.% of a secondary antioxidant and 0.01 to 5.0 wt.% of a polyalkylene glycol, based on the total weight of the lubricant composition, wherein the lubricant composition has a total acid value change of less than 5% based on ASTM D664, and a color stability of L of 0.5 to 3.5 or less based on ASTM D1500.
In one embodiment of the present invention, the lubricant composition may further comprise 0.01 to 3.0 wt.% of a phenolic antioxidant and 0.01 to 3.0 wt.% of an amine antioxidant.
In one embodiment of the present invention, the lubricant composition may further comprise 0.01 to 2.0 wt.% of a phenolic antioxidant and 0.01 to 2.0 wt.% of an amine antioxidant.
In one embodiment of the present invention, the secondary antioxidant may be a phosphorous antioxidant or a sulfur antioxidant.
In one embodiment of the present invention, the phosphorus antioxidant may comprise at least one selected from the group consisting of trialkyl phosphite, trialkyl phosphate, and trialkyl phosphine.
In one embodiment of the present invention, the trialkyl phosphite may comprise at least one selected from the group consisting of trimethyl phosphite, triethyl phosphite, triisopropyl phosphite, tributyl phosphite, tris (trimethylsilyl) phosphite, tris (t-butyldimethylsilyl) phosphite, diisodecylphenyl phosphite, di-t-butyl phosphite, dimethyltrimethylsilyl phosphite, diethyltrimethylsilyl phosphite, tris (2-ethylhexyl) phosphite, tris (2, 4-di-t-butylphenyl) phosphite, tris (tridecyl) phosphite, triphenyl phosphite, tris (nonylphenyl) phosphite, triisodecyl phosphite, triacontyl phosphite, trilauryl phosphite, and benzyldiethyl phosphite.
In one embodiment of the present invention, the trialkyl phosphate may comprise at least one selected from the group consisting of trilauryl phosphate, triolein phosphate, dioleoyl hydrogen phosphate, C12-C15 phosphate, C8-C10 phosphate, alkyl diphenyl phosphate, alkyl ditolyl phosphate, polypropylene glycol-5-cetyl-10 phosphate, ceteth-5 phosphate, ceteth-4 phosphate, polyethylene glycol-5 ethylhexyl ether phosphate, tris (tridecyl) phosphate, triphenyl phosphate, tris (nonylphenyl) phosphate, and triisodecyl phosphate.
In one embodiment of the present invention, the trialkylphosphine may comprise at least one selected from the group consisting of tri-n-butylphosphine, tris (2-cyanoethyl) phosphine, tri-n-octylphosphine, tris (3-hydroxypropyl) phosphine, monoisobutylphosphine, dicyclohexylphosphine, 4, 8-dimethyl-2-phosphabicyclo [3.3.1] nonane, mono-2, 4, 4-trimethylpentylphosphine, and di-t-butylphosphine.
In one embodiment of the present invention, the alkyl diphenyl phosphate may comprise a compound selected from the group consisting of methyl diphenyl phosphate, ethyl diphenyl phosphate, propyl diphenyl phosphate, n-butyl diphenyl phosphate, 2-methylpropyl diphenyl phosphate, n-pentyl diphenyl phosphate, 2-methylbutyl diphenyl phosphate, 2-dimethylpropyl diphenyl phosphate, n-hexyl diphenyl phosphate, 2-methylpentyl diphenyl phosphate, 2, 2-dimethylbutyl diphenyl phosphate, n-heptyl diphenyl phosphate, n-octyl diphenyl phosphate, n-decyl diphenyl phosphate, n-dodecyl diphenyl phosphate, tridecyl diphenyl phosphate, tetradecyl diphenyl phosphate, n-hexadecyl diphenyl phosphate, and octadecyl diphenyl phosphate.
In one embodiment of the present invention, the alkyl ditolyl phosphate may comprise at least one selected from the group consisting of ethyl ditolyl phosphate, ethyl diphenyl phosphate, n-hexyl ditolyl phosphate, 2-methylpentyl ditolyl phosphate, 2-dimethylbutyl ditolyl phosphate, n-octyl ditolyl phosphate, 2-ethylhexyl ditolyl phosphate, 3,5, 5-trimethylhexyl ditolyl phosphate, n-decyl ditolyl phosphate, n-dodecyl ditolyl phosphate, and tridecyl ditolyl phosphate.
In one embodiment of the present invention, the antioxidant may be a thiol ester, and particularly, the antioxidant may include at least one selected from the group consisting of pentaerythritol tetrakis (3-laurylthiopropionate), dilauryl thiodipropionate, distearyl thiodipropionate, ditridecyl thiodipropionate, and dimyristyl thiodipropionate.
In an embodiment of the invention, the polyalkylene glycol may have a viscosity of ISO VG680 or less, in particular, the polyalkylene glycol may have at least one ISO VG selected from the group consisting of ISO VG18, ISO VG 22, ISO VG 32, ISO VG46, ISO VG68, ISO VG 100, ISO VG 150, ISO VG 220, ISO VG 320, ISO VG460 and ISO VG 680.
In one embodiment of the present invention, the phenolic antioxidant may comprise at least one selected from the group consisting of 2, 6-dibutylphenol, hindered bisphenol, high molecular weight hindered phenol, and hindered phenol having thioether.
In one embodiment of the present invention, the amine antioxidant comprises at least one selected from the group consisting of diphenylamine, alkylated diphenylamine, and naphthylamine, and the alkylated diphenylamine may comprise at least one selected from the group consisting of dioctyldiphenylamine, octylated diphenylamine, and butylated diphenylamine.
Advantageous effects of the invention
According to one aspect of the invention, the lubricant composition includes a defined amount of a secondary antioxidant and a polyalkylene glycol, thereby improving the thermo-oxidative stability of the lubricant. In particular, the color stability of the lubricant upon oxidation can be maintained for a long period of time, and thus it is possible to alleviate the anxiety of consumers due to the color change occurring after the use time even shorter than the oil change period (oil drain interval) and to extend the oil change period.
Further, according to an aspect of the present invention, the lubricant composition further comprises a predetermined amount of a secondary antioxidant, a polyalkylene glycol, and/or a phenol antioxidant and an amine antioxidant in addition to typical additives of conventional lubricant compositions, which can provide a novel antioxidant system different from the conventional antioxidant system and can slow down the color change of oil, thereby extending the oil change cycle and the use time of oil, ultimately resulting in economic benefits.
In addition, in one aspect of the present invention, the lubricant composition has significantly improved color stability even when stored at high temperatures due to increased thermal oxidation stability, thereby enabling lubricants having high quality to be safely used for longer periods of time.
Drawings
Fig. 1 shows standard color values based on ASTM D1500.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. These embodiments are merely illustrative, and not restrictive of the invention, which is defined by the scope of the claims set forth herein.
One aspect of the present invention provides a lubricant composition for improving thermo-oxidative stability and color stability comprising 0.01 to 3.0 wt.% of a secondary antioxidant and 0.01 to 5.0 wt.% of a polyalkylene glycol, based on the total weight of the lubricant composition, wherein the lubricant composition has a total acid value change of less than 5% based on ASTM D664, and a color stability of L of 0.5 to 3.5 or less based on ASTM D1500.
In one embodiment of the present invention, the secondary antioxidant may be a phosphorous antioxidant or a sulfur antioxidant.
The phosphorus antioxidant may be a phosphorus antioxidant consisting of (RO)3A trialkyl phosphite represented by P, wherein R is alkyl (having 0 or more carbons); consists of (R')3A trialkyl phosphate represented by PO, wherein R' is an alkyl group (having 0 or more carbons); or by R'3P represents a trialkylphosphine wherein R' is an alkyl group (having 0 or more carbons).
The trialkyl phosphite may comprise any one or more selected from the group consisting of trimethyl phosphite, triethyl phosphite, triisopropyl phosphite, tributyl phosphite, tris (trimethylsilyl) phosphite, tris (t-butyldimethylsilyl) phosphite, diisodecylphenyl phosphite, di-t-butyl phosphite, dimethyltrimethylsilyl phosphite, diethyltrimethylsilyl phosphite, tris (2-ethylhexyl) phosphite, tris (2, 4-di-t-butylphenyl) phosphite, tris (tridecyl) phosphite, triphenyl phosphite, tris (nonylphenyl) phosphite, triisodecyl phosphite, triacontyl phosphite, trilauryl phosphite, and benzyldiethyl phosphite.
The trialkyl phosphate may comprise any one or more selected from the group consisting of trilauryl ester, triolein phosphate, dioleoyl hydrogen phosphate, C12-C15 phosphate, C8-C10 phosphate, alkyl diphenyl phosphate, alkyl ditolyl phosphate, polypropylene glycol (PPG) -5-cetyl-10 phosphate, ceteth-5 phosphate, decylether-4 phosphate, polyethylene glycol (PEG) -5 ethylhexyl ether phosphate, tris (tridecyl) phosphate, triphenyl phosphate, tris (nonylphenyl) phosphate, and triisodecyl phosphate.
The trialkylphosphine may comprise any one or more selected from the group consisting of tri-n-butylphosphine, tris (2-cyanoethyl) phosphine, tri-n-octylphosphine, tris (3-hydroxypropyl) phosphine, monoisobutylphosphine, dicyclohexylphosphine, 4, 8-dimethyl-2-phosphabicyclo [3.3.1] nonane, mono-2, 4, 4-trimethylpentylphosphine, and di-t-butylphosphine.
The antioxidant sulfur may be a thiol ester. The sulfur antioxidant may comprise any one or more selected from the group consisting of pentaerythritol tetrakis (3-laurylthiopropionate), dilaurylthiodipropionate, distearylthiodipropionate, tricosyl thiodipropionate, and dimyristylthiodipropionate.
In one embodiment of the invention, the amount of secondary antioxidant may be from 0.01 to 3.0 wt.%, or from 0.01 to 2.0 wt.%. If the amount of the secondary antioxidant exceeds 3.0 wt%, defoaming property, anti-emulsifying property and friction property may be deteriorated. On the contrary, if the amount thereof is less than 0.01 wt%, it is difficult to improve the thermal oxidation stability and the color stability.
In one embodiment of the invention, the polyalkylene glycol used in the lubricant composition may have a viscosity at 40 ℃ kinematic viscosity of 680cSt (centistokes) or less (ISO VG680 or less). More specifically, the viscosity of the polyalkylene glycol is ISO VG18, ISO VG 22, ISO VG 32, ISO VG46, ISO VG68, ISO VG 100, ISO VG 150, ISO VG 220, ISO VG 320, ISO VG460, or ISO VG 680.
The amount of polyalkylene glycol may be 0.01 to 5.0 wt% or 0.01 to 2.0 wt%. If the amount of the polyalkylene glycol is less than 0.01 wt%, it is difficult to ensure the effect thereof, and the same effect as when the secondary antioxidant is used alone may be exhibited. On the contrary, if the amount thereof exceeds 5.0 wt%, the anti-emulsification property may be reduced and the color stability may be deteriorated.
In one embodiment of the present invention, the composition may further comprise 0.01 to 3.0 wt% of a phenol antioxidant and 0.01 to 3.0 wt% of an amine antioxidant, or may further comprise 0.01 to 2.0 wt% of a phenol antioxidant and 0.01 to 2.0 wt% of an amine antioxidant. From the viewpoint of improving oxidation stability, it is more preferable to use both a phenol antioxidant and an amine antioxidant. If the amount of the phenolic antioxidant and the amine antioxidant is less than 0.01 wt%, the effect is not significant. Conversely, if the amount thereof exceeds 3.0 wt%, these components may generate a larger amount of oxidation products such as sludge, rather than contributing to the improvement of oxidation stability, undesirably decreasing the thermal oxidation stability and color stability of the oil due to an excess thereof.
In one embodiment of the present invention, the phenolic antioxidant is a bisphenol. Specifically, the phenolic antioxidant may comprise any one or more selected from the group consisting of 2, 6-dibutylphenol, hindered bisphenol, high molecular weight hindered phenol, and hindered phenol and thioether.
In one embodiment of the invention, the amine antioxidant is aniline. In particular, the amine antioxidant may comprise diphenylamine, alkylated diphenylamine, or naphthylamine. The alkylated diphenylamine may comprise any one or more selected from the group consisting of dioctyldiphenylamine, octylated diphenylamine, and butylated diphenylamine.
A better understanding of the present invention may be obtained through the following examples, which are set forth to illustrate, but are not to be construed to limit the scope of the present invention.
Examples
In one embodiment of the present invention, the thermo-oxidative stability is measured using a test method based on ASTM D2070, which is specifically described below.
In a 250ml Griffin beaker, iron and copper catalytic rods were placed across each other and 200ml of a lubricant sample was added. The beaker was placed in an aluminum block in a standard convection oven at 135 ℃ and heated for 168 hours. After 168 hours, the TAN change of the lubricant samples was measured according to ASTM D664. A lower TAN variation in response to oxidation of the oil is considered an indication of superior thermo-oxidative stability.
The color of the lubricant was measured according to ASTM D1500 test method. Specifically, a lubricant sample is placed in a test tube and its color is compared to the color of standard colored glass, thus selecting a standard color value that matches the color of the sample. When the colors do not match each other, a dark color value is selected. As shown in fig. 1, the ASTM color has a standard color number in the range of 0.5 to 0.8.
In the ASTM D1500 test, fresh oil is used to check the purity level and contamination level of base oil, and used oil is used to determine the oxidation level of the oil to check whether the oil can be used further.
In the ASTM D1500 test for measuring color stability, the color stability of an oil stored at high temperature (180 °, 48 hours) is measured, not the color stability of a new oil.
Here, a high temperature storage test of oil was performed using a beaker oxidation test. Specifically, iron and copper catalysts were placed in a beaker to promote oxidation, and the samples were stored in a convection oven at 180 ℃ for 48 hours. The degree of oxidation of the oil is evaluated under conditions promoting its oxidation, including high temperature storage, temperature change, catalysts, and the like.
A typical lubricant composition comprises 0 to 5.0 wt.% antioxidant, 0.1 to 15.0 wt.% metal cleaner, 0 to 5.0 wt.% preservative, 0 to 5.0 wt.% defoamer, 0.01 to 10.0 wt.% viscosity modifier, 0.5 to 5.0 wt.% dispersant, balance base oil.
In the following examples and comparative examples, mixture a was a lubricant composition comprising 0.5 wt% of a preservative (amine phosphate), 0.1 wt% of a defoamer (silicon-type defoamer), 0.5 wt% of a pour point depressant (polymethacrylate), 5.0 wt% of a viscosity modifier (olefin copolymer), 1.0 wt% of a dispersant (polyisobutylene succinic anhydride), and the balance lubricant base oil (YUBASE 4/6).
In the following examples and comparative examples, mixture B was a lubricant composition comprising 1.0 wt% of a preservative (amine phosphate), 0.05 wt% of a defoaming agent (silicon-type defoaming agent), 1.0 wt% of a pour point depressant (polymethacrylate), 8.0 wt% of a viscosity modifier (olefin copolymer), 2.0 wt% of a dispersant (polyisobutylene succinic anhydride), and the balance lubricant base oil (YUBASE 4/6).
The specific components and amounts of the lubricant compositions in the respective examples and comparative examples are shown in tables 1 to 6 below.
In tables 1 to 6, the thermo-oxidative stability and color stability values of the lubricant compositions of examples and comparative examples were measured by Cincinnati Milacron thermal stability test (ASTM D2070) and ASTM color test (ASTM D1500). The results are shown in the tables.
In order to evaluate the characteristics shown in tables 1 to 6, the thermal oxidation stability was determined according to ASTM D2070.
For color stability, the samples were stored with iron and copper catalysts for 48 hours in a typical convection oven at 180 ℃ and their color stability was subsequently measured according to ASTM D1500. Referring to fig. 1, the ASTM color has a standard color number of 0.5 to 8.0.
As important properties of the lubricant, its kinematic viscosity was measured, and a viscosity index of viscosity with temperature was measured. The term "viscosity" refers to a kinematic viscosity of 40 ℃ and is measured according to ASTM D445. The viscosity index was measured by ASTM D2270 based on kinematic viscosity at 40 ℃ and 100 ℃.
In examples 1 to 72, the measured viscosity was ISO VG46, and the "viscosity" having the meaning of kinematic viscosity was obtained by dividing the absolute viscosity by the density.
The lubricants of examples 1 to 72 had kinematic viscosities at 40 ℃ within 46cSt (centistokes) ± 10%.
In Table 1 below, the phosphorus antioxidant tris (2, 4-di-tert-butylphenyl) phosphate and ISO VG18 polyalkylene glycol were used.
Table 1: lubricant compositions comprising phosphorus antioxidant/polyalkylene glycol
[ Table 1]
In examples 25 to 72, the phosphorus antioxidant was tris (2, 4-di-tert-butylphenyl) phosphite and the polyalkylene glycol was ISO VG18 polyalkylene glycol. Additionally, the phenolic antioxidant is a hindered phenol and the amine antioxidant is a nonylated diphenylamine.
Table 2: lubricant composition comprising phosphorus antioxidant/polyalkylene glycol/phenol antioxidant/amine antioxidant
[ Table 2]
Comparative example
In the following comparative examples, the same procedures as in examples were carried out using a phosphorus antioxidant and a polyalkylene glycol, and optionally a phenol antioxidant and an amine antioxidant, except that the amounts thereof were changed.
In comparative examples 1 to 24, the phosphorus antioxidant was trilauryl phosphate and the polyalkylene glycol was ISO VG 320 polyalkylene glycol. The results are shown in table 3 below.
Table 3: lubricant compositions comprising phosphorus antioxidant/polyalkylene glycol
[ Table 3]
In comparative examples 25 to 46, the phosphorus antioxidant was trilauryl phosphate and the polyalkylene glycol was ISO VG680 polyalkylene glycol. The results are shown in table 4 below.
Table 4: lubricant compositions comprising phosphorus antioxidant/polyalkylene glycol
[ Table 4]
In comparative examples 47 to 66, the phosphorus antioxidant was triisodecyl phosphite and the polyalkylene glycol was ISO VG460 polyalkylene glycol. The results are shown in table 5 below.
Table 5: lubricant composition comprising a phosphorus antioxidant/polyalkylene glycol/hindered phenol
[ Table 5]
In comparative examples 67 to 94, the phosphorus antioxidant was triisodecyl phosphite and the polyalkylene glycol was ISO VG460 polyalkylene glycol. In addition, the phenolic antioxidant is hindered phenol and the aminic antioxidant is diphenylamine. The results are shown in table 6 below.
Table 6: lubricant composition comprising phosphorus-containing antioxidant/polyalkylene glycol/hindered phenol/diphenylamine
[ Table 6]
As is apparent from tables 1 and 2, the lubricant compositions of the examples of the present invention exhibited a TAN variation of less than 5% (ASTM D664) and a color stability (ASTM D1500) with L of 0.5 to 3.5 or less after the thermo-oxidative stability and color stability tests, indicating excellent thermo-oxidative stability and color stability. However, as shown in tables 3 to 6, the lubricant compositions of the comparative examples had a TAN variation of about 9 to 30% and an average TAN variation of 15 to 25%, thereby evaluating that their thermal oxidation stability was inferior to that of the lubricant compositions of the examples of the present invention. Further, the lubricant compositions of the comparative examples exhibited very poor color stability because the values thereof fell within the range of 5.0 to 8.0, which was significantly higher than the color stability value L (ranging from 0.5 to 3.5 or lower) of the lubricant compositions of the examples.
In particular, the lubricant compositions according to embodiments of the present invention can exhibit excellent color stability even after being subjected to oxidation of oil stored at high temperature, rather than fresh oil.
Thus, the lubricant composition according to the present invention may show significantly improved oxidation stability and color stability compared to conventional lubricant compositions.
In addition, when the secondary antioxidant, the polyalkylene glycol, the phenol antioxidant, and the amine antioxidant are used in an excessive amount beyond the scope of the present embodiment, the thermal oxidation stability and the color stability are lowered upon long-term use of the lubricant, and the effects thereof may be deteriorated or side reactions may occur due to the use of a large amount of additives.
Claims (12)
1. A lubricant composition for improving thermo-oxidative stability and color stability comprising 0.01 to 3.0 wt.% of a secondary antioxidant, 0.01 to 5.0 wt.% of a polyalkylene glycol, 0.01 to 3.0 wt.% of a phenolic antioxidant, and 0.01 to 3.0 wt.% of an amine antioxidant, based on the total weight of the lubricant composition,
wherein the lubricant composition has a total acid value change of less than 5% based on ASTM D664, and a color stability of 0.5 to 3.5 or less based on ASTM D1500,
wherein the auxiliary antioxidant is a phosphorus antioxidant,
wherein the phosphorus antioxidant comprises at least one selected from the group consisting of trialkyl phosphite, trialkyl phosphate and trialkyl phosphine, and
wherein the polyalkylene glycol has a viscosity of ISO VG680 or less.
2. The lubricant composition of claim 1, wherein the phenolic antioxidant is present in an amount of 0.01 to 2.0 wt.%, and the amine antioxidant is present in an amount of 0.01 to 2.0 wt.%.
3. The lubricant composition of claim 1, wherein the trialkyl phosphite comprises a phosphorous acid selected from the group consisting of trimethyl phosphite, triethyl phosphite, triisopropyl phosphite, tributyl phosphite, tris (trimethylsilyl) phosphite, tris (t-butyldimethylsilyl) phosphite, diisodecyl phenyl phosphite, di-t-butyl phosphite, dimethyltrimethylsilyl phosphite, diethyltrimethylsilylphosphite, tris (2-ethylhexyl) phosphite, tris (2, 4-di-tert-butylphenyl) phosphite, tris (tridecyl) phosphite, triphenyl phosphite, tris (nonylphenyl) phosphite, triisodecyl phosphite, triacontyl phosphite, trilauryl phosphite and benzyldiethyl phosphite.
4. The lubricant composition of claim 1, wherein the trialkyl phosphate comprises at least one selected from the group consisting of trilauryl phosphate, triolein phosphate, dioleoyl hydrogen phosphate, C12-C15 phosphate, C8-C10 phosphate, alkyl diphenyl phosphate, alkyl ditolyl phosphate, polypropylene glycol-5-cetyl-10 phosphate, ceteth-5 phosphate, decylether-4 phosphate, polyethylene glycol-5 ethylhexyl ether phosphate, tris (tridecyl) phosphate, triphenyl phosphate, tris (nonylphenyl) phosphate, and triisodecyl phosphate.
5. The lubricant composition of claim 1, wherein the trialkylphosphine comprises at least one selected from the group consisting of tri-n-butylphosphine, tris (2-cyanoethyl) phosphine, tri-n-octylphosphine, tris (3-hydroxypropyl) phosphine, monoisobutylphosphine, dicyclohexylphosphine, 4, 8-dimethyl-2-phosphabicyclo [3.3.1] nonane, mono-2, 4, 4-trimethylpentylphosphine, and di-t-butylphosphine.
6. The lubricant composition of claim 4 wherein said alkyl diphenyl phosphate comprises a member selected from the group consisting of methyl diphenyl phosphate, ethyl diphenyl phosphate, propyl diphenyl phosphate, n-butyl diphenyl phosphate, 2-methylpropyl diphenyl phosphate, n-pentyl diphenyl phosphate, 2-methylbutyl diphenyl phosphate, 2-dimethylpropyl diphenyl phosphate, n-hexyl diphenyl phosphate, 2-methylpentyl diphenyl phosphate, 2, 2-dimethylbutyl diphenyl phosphate, n-heptyl diphenyl phosphate, n-octyl diphenyl phosphate, n-decyl diphenyl phosphate, n-dodecyl diphenyl phosphate, tridecyl diphenyl phosphate, tetradecyl diphenyl phosphate, n-hexadecyl diphenyl phosphate, and octadecyl diphenyl phosphate.
7. The lubricant composition of claim 4, wherein the alkyl ditolyl phosphate comprises at least one selected from the group consisting of ethyl ditolyl phosphate, n-hexyl ditolyl phosphate, 2-methylpentyl ditolyl phosphate, 2-dimethylbutyl ditolyl phosphate, n-octyl ditolyl phosphate, 2-ethylhexyl ditolyl phosphate, 3,5, 5-trimethylhexyl ditolyl phosphate, n-decyl ditolyl phosphate, n-dodecyl ditolyl phosphate, and tridecyl ditolyl phosphate.
8. The lubricant composition of claim 1, wherein the polyalkylene glycol has at least one ISO VG selected from the group consisting of ISO VG18, ISO VG 22, ISO VG 32, ISO VG46, ISO VG68, ISO VG 100, ISO VG 150, ISO VG 220, ISO VG 320, ISO VG460, and ISO VG 680.
9. The lubricant composition according to claim 1 or 2, wherein the phenolic antioxidant comprises at least one selected from the group consisting of 2, 6-dibutylphenol, a hindered bisphenol, a high molecular weight hindered phenol, and a hindered phenol with a thioether.
10. The lubricant composition of claim 1 or 2, wherein the amine antioxidant comprises at least one selected from the group consisting of diphenylamine, alkylated diphenylamine, and naphthylamine.
11. The lubricant composition of claim 10, wherein the alkylated diphenylamine comprises at least one selected from the group consisting of octylated diphenylamine and butylated diphenylamine.
12. The lubricant composition of claim 10, wherein the alkylated diphenylamine is dioctyldiphenylamine.
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| KR1020150120207A KR101831489B1 (en) | 2014-08-27 | 2015-08-26 | Lubricant Composition for Excellent Thermo-Oxidation Stability and Color Stability |
| PCT/KR2015/008969 WO2016032246A1 (en) | 2014-08-27 | 2015-08-27 | Lubricant composition for improving thermo-oxidation stability and color stability |
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| CN101432405A (en) * | 2006-02-28 | 2009-05-13 | 科聚亚公司 | Stabilizing compositions for lubricants |
| CN101466818A (en) * | 2006-05-15 | 2009-06-24 | 国际壳牌研究有限公司 | Lubricating oil composition |
| CN103396874A (en) * | 2013-06-25 | 2013-11-20 | 岳西县新峰机械制造有限公司 | Lubrication cutting fluid and its preparation method |
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| CN101466818A (en) * | 2006-05-15 | 2009-06-24 | 国际壳牌研究有限公司 | Lubricating oil composition |
| CN103396874A (en) * | 2013-06-25 | 2013-11-20 | 岳西县新峰机械制造有限公司 | Lubrication cutting fluid and its preparation method |
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| CN106604981A (en) | 2017-04-26 |
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