JPS5975997A - Synthetic lubricating agent composition for transmission - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Background of the Invention Synthetic lubricants are in increasing demand because of their homogeneity and stability. Synthetic lubricants, especially those containing polyol esters, have many desirable properties.

Vehicle transmission lubricants used today must meet many stringent standards.

The transmission may be surrounded by sound absorbing material, which acts as an insulating shell and still has the side effect of increasing the temperature of the lubricant.

The sealing swelling properties of lubricant compositions are extremely important if engine fluid leakage is to be maintained at acceptable levels.

Polyol esters used as lubricants often exhibit unacceptably high sealing swelling. Poly-α-olefins used as lubricants often exhibit negative sealing swelling (
, & does not have heat resistance stability like lyol ester.

According to the disclosure of U.S. Pat. No. 4,144,183, yI
? The use of linear or branched caldic acid mixtures in lyol esterification to improve the viscosity-temperature properties of ester oils. According to the disclosure of U.S. Pat. The polyol is esterified in a mixture with phosphoric acid to improve the sealing compatibility of the polyol ester lubricant.

Synthetic lubricants often obtain desired viscosity properties by adding viscosity index improvers.

Viscosity index improver polymers often deteriorate over time. Lubricants blended with modifiers have a limited service life due to this slow deterioration.

The synthetic transmission lubricant compositions produced have good stability, acceptable viscosity, and good sealing swelling properties without the inclusion of degrading viscosity index improvers or sealing lubricants. This is desirable.

FIELD OF THE INVENTION This invention relates to lubricant compositions and methods of using the same in machines requiring lubrication.

Summary of the Invention A synthetic lubricant composition for transmissions comprises (A) a polyol ester prepared by esterifying trimethylolpronobase with a monocarbic acid having 8 to 12 carbon atoms, and (B) a carbon having a branched chain. Monocarbic acid with 18 to 24 atoms and trimethylol prono 4? and (C) a liquid poly-α-olefin.

The object of the detailed description of the invention is to provide a synthetic lubricant for use as a general purpose and heavy duty lubricant in the transmission of internal combustion engines, and in particular for use in heavy duty transmissions of commercial road vehicles such as buses and trucks. be.

Properties defining acceptable transmission lubricants for purposes of this invention include Detrolt Dieselb Al 11son W Type C-3T (hydra
ul Ic Tranamlss tonFluid
5 standard. The properties of the synthetic lubricant of the present invention are as follows: Detroit Diesel All 1s
on 10 WType C-3 lubricant specifications, below @1
Conforms to the test standards listed in the table.

Table 1 Viscosity, -18°C (06F) 2,400
oPM large viscosity, 37.8℃ (below 100) -m-・viscosity, 98.9℃ (210F) 5.75c
st minimum pour point -28,9℃ (-20”F
) Maximum defoaming 11m (7716 inches, 19
Maximum) Abrasion Resistance No scratches, nicks, or streaks that indicate abrasive turns, and will not fest or sludge.

(7) Oxidation resistance No festering or sludge formation, no blackening/flake formation of Cu, 15 cm max. 98.9°C (210'F) Viscosity SUS increased sealing test Full immersion Candidate volume 0.45~ 6.
70% Candidate Hardness 5~-5Pts.

Dip cycle Candidate volume 0～]0 yandite hardness -2~3Pti Chip cycle Candidate volume 1.0~6.0 yande date hardness θ~-10Pts Rust prevention
Friction retention without rust or corrosion Maximum slip time 0.
85 seconds or less.

Torque 751b-ft Minimum Torque Differential 301b-fti The composition of the transmission lubricant invented by Omoto Ozeki has as essential components CA) General formula (8), where R1, R2 and R3 are The same or different -0CH2(CH2)xCH5 groups,
A polyol ester in which X is an integer from 6 to ]0, and (B
) It is represented by the following general formula % formula %, where R4, R5 and R6 are the same or different iso n hydrocarbon groups, and n is 18 to 2.
and (C) a 17-α-olefin having a kinematic viscosity of about 3 to about 6 est, wherein the weight ratio of component (4) to component (B) is about 2:1. ~
about 1=2, and the weight ratio of the sum of components (A+B) to component (C) is from about 2.4:1 to about 1.5:I, and the sum of components (A+B+C) is at least about 90
He is in charge of weight.

Weight ratio of component (B): H1, 6:1 to 1.2:1
is preferred, and the weight ratio of the total component (A+B) to component (C'l) is preferably 2.1:1 to 1.6:1.

Preferably, the sum of components (A+B+C) is from about 90 to about 93 percent by weight of the composition. Synthetic transmission lubricants consist essentially of essential components (A, B% C) and conventional optional lubricating components. Optional components of the lubricant composition make up 8% of the total composition.
It is preferable that it is less than the weight factor.

Component (N to appropriate ratio of component (B) and component (A+B)
The appropriate ratio of sum to component (C) is approximately determined by a linear admonition model. Each component contributes to the overall viscosity in direct proportion to the viscosity of each component multiplied by the weight ratio in the composition within the ratio ranges taught herein. The viscosity properties of the final product lubricating composition are determined by blending the final coat of all components, including any optional additives, with component (A), (B) or (
The viscosity can be finely adjusted by appropriately adding any one of C).

The above-mentioned 4-lyol ester component (B) can be prepared by conventional esterification. Suitable esterification techniques are described in U.S. Pat. No. 3,778,454, column 4, lines 9-75; and is disclosed in column 5, lines 1 to 12.

It is convenient to completely esterify the component (Alld) II methylolpropropane (TMP) of the compositions of the invention with a linear monocarboxylic acid or a mixture of linear monocarboxylic acids having from 8 to 12 carbon atoms. It is. Suitable acids for esterifying TMP to prepare component (A) are n-octanoic acid, n-nonanoic acid and decanoic acid. Straight chain C
Mixtures of 8 to C12 Karuka Gungo can also be used if desired. In particular, nonanoic acid is produced by esterifying TMP as a component (A).
) gives suitable ester oil.

Component (B) of the composition of the present invention can be conveniently prepared by complete esterification of TMP with a branched carbon 18-24 caldic acid. Examples of monocarboxylic acids suitable for esterifying TMP to give component (B) include isostearic acid, inoctadecane, and acids containing 18 or more carbon atoms with symmetrical branching and which are Patent No. 4.144,183, No. 4a No. 55~
It is stated in line 68 and lines 1 to 39 of column 5. In C18-24 monocal? A mixture of acids can be used. Trimethylo(11) monoruderonocuntriinsteriophosphate is a component (
A particularly preferred ester oil for use as B1.

Component (C'') of the compositions of the present invention is an ij/I-alpha-olefin having a viscosity at 98.9°C of from about 3 to about 6 cstO. They can be prepared by racking or oligomerization, as described in the Encyclopedia of Che
mical Technology, Th1rd E
d, Vol, IL p, p.

487-492. l5BNO-471-02069-9
It is described in . C6-C2o olefin oligomers are described in the above Encyclopedia, page 492, and are preferred for use as component (C). Poly-alpha-decene having a viscosity of about 4 cSt is particularly preferred in the practice of this invention.

The balance of less than 10 parts by weight of the lubricant composition is conventional lubricant additives such as corrosion inhibitors, antioxidants, additives, metal deactivators, defoamers and dyes. In a preferred aspect of the invention, the lubricant composition does not contain viscosity index improver polymers or sealing swelling agents (12). Even without a viscosity modifier, it has the necessary physical properties of a silk IAi product, and the quality of the product deteriorates when the viscosity modifier is added.

The synthetic 11VI lubricant silk material for transmissions of the present invention can be used for machine lubrication. Machinery is lubricated by contacting the moving parts of the machine with a lubricant composition.

The contact method is the usual method, i.e. spray, immersion fI.
There is t or padding. The lubrication method of the invention can be used in particular for treating metal parts of vehicles.

Next, examples of the present invention will be shown.

Example composition (I) (wt%) 23.759 34.94) Limethylolpronotrisostearate (TMP/3.8nCp) 17.000 25.00) Limethylolpronotrisostearate (TMP/3.8nCp) 3.0isoC48) 22.399 32.94 Poly-α-decene-4cs (Gulf Oiland Chemic
al s g ) 4.48B 6.6 Lubr
lzol 79] QTM (LubrizolCorp,
)Multifunctional additive. Chemical properties (wt%), Ca 1
．． 1-1.3, Po, 24-030.82.2-2.7
, BO24~032, NO, 75~1.05°15.
Specific gravity at 6℃ 095. Viscosity at 100℃ 45cSt340
0.50 Phenyl-α-naphthylamine antioxidant 13.6 0.02 Benzotriolizole, metal deactivator 17 25ppm SWS-101ANTIF
A solution of OAM (manufactured by SWSCorp) antifoaming agent diluted in toluene to 10 liters. Transmission lubricant approx. 75.7! (about 68.0
001 was prepared as follows. Clean dry yf? ,) was added to the above Ml of phenyl-α-naphthylamine and trimethylolpropane tripelargonic acid ester. A preblend was prepared by heating these materials at Fi 71.1-767° C. for 1 hour to dissolve the solids.

This preblend was then added to a 75.7 liter pot along with the remaining ingredients of the above combined lubricant composition. Heat this entire blend to 60-65.6℃ to 1-1.5
Stir for an hour and stir evenly. Next, the cooled composition was passed through a Viscon paper and placed in an F3 pot, and the P solution was stored.

The transmission lubricant introduction blend of this example has the following physical properties.

Table 2 Viscosity 98.9°C (cs) 6.437.
8°C (cm) 36.2 -17.8°C (cs) 1049 -28.9°C (ca) 312] Viscosity index 141 Pour point (°C) -43 Total acid value (1# KOH/g) 0.46 Flash point C0C (''C) 238 Combustion point C0C
(''C) 266 spontaneous ignition point ('C)
421.1 specific gravity 15.6'715.6℃
0.896025'/25℃ 0
．． 89 (1(1()5) Solubility Soluble in gasoline, hexane, chloroform and toluene vs. heavy swelling Bnn-N-thi swelling percentage 1489°C, 70#fL,'l 3.31 Hardness change -1 The present invention Although the above special example has been described, it is clear that this example is not intended to limit the scope of the claims.

patent applicant Stouffer Chemical Kanno Yani Patent Application Agent Patent attorney Akira Aoki Patent Attorney Kazuyuki Nishitate Patent attorney Tera 1) Yutaka Patent attorney Akira Yamaguchi Patent attorney Masaya Nishiyama '. 7) -675- (16)

Claims (1)

[Claims] 1. Dstrolt D%esel A11lson IO consisting of a mixture of components (A), (B) and (C)
A lubricant composition for a W-type transmission, wherein component (A) is represented by the general formula, where R1, R2 and R3 are the same or different -0CH2(CH2)XCH6 groups, and
is an integer of 6 to 10, component (B
) is represented by the general formula % formula %, where R4, R5 and R6 are the same or different f, (iso-Cn hydrocarbons, where n is 18
and the weight ratio of component (A) 7↑component (B) is about 2:1 to about 1-
2. The weight ratio of the total of components (A+R) to component (C) is approximately 2.
4:1 to about 1.5:1, the sum of components (A+B+C) being at least about 8% by weight of the composition. 2. The composition according to claim 1, in which component (N) is trimethylolglointriintanate. 3. The composition according to claim 1, in which component (B) is trimethylolpropane triisosteric acid ester. The composition according to claim 1. 4. The composition according to claim 1, wherein component (Q is a C6-C2o poly-α-?liolefin). 5. The composition according to claim 1, wherein component (O has a kinematic viscosity of 3. 5-4.2 cSt poly-
The composition according to any one of claims 1 to 3, which is α-decene. 6 components (weight ratio of N to component (B) is 1.6:1 to 1.
2=1, and the weight ratio of the sum of components (A+B) to component (C) is 21:1 to 1.6 to 1. A composition according to any one of claims 1 to 4. 7. Component (A) is trimethylolpropane) IJ heptanoate, component (B) is trimethylolpronoginstearate, and component (C) is polyα-
7. The composition of claim 6, which is f-sen. 8. The composition according to claim 1, which comprises optional components selected from anticorrosive agents, antioxidants, antiwear agents, metal deactivators, antifoaming agents, and dyes. thing. 9. The composition of claim 8 containing optional ingredients less than 9.8 FtS. 10, Detrolt Diesel AIHson 10 consisting of a mixture of components (4), (B) and (C)
WfJi) A lubricant composition for Ranmitushiron, comprising the following components:
is an integer of 6 to 10, component (B
) is represented by the general formula % formula %, where R4, R5 and R6 are the same or different iso-Cn hydrocarbon groups,
d, which is an integer of 4? Polyol ester powder - viscosity approx. 3
~6 est, and the weight ratio of component (4) to component (B) is from about 2:1 to about 1:2.
, the weight ratio of the sum of components (A+B) to component (C1) is about 2.
4:1 to about 1.5:1. A method of lubricating a moving part of a machine with a transmission lubricant composition in which the sum of the components (A+B+C) is at least about 90 parts kA' of said composition. 11 Weight ratio of component (A) to component (B) is 1.6:1
11. The method according to claim 10, wherein the weight ratio of the sum of components (A + B) to component (C) is 2.1 = 1 to 1.6 to 1. 11. The method of claim 10, comprising components selected from dyes and dyes. 13. A method according to any of claims 10 to 12, wherein the machine is a vehicle transmission.