JP2002128721A - Ether compound and fluid composition for traction drive containing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fluid composition for a traction drive having excellent low-temperature fluidity, a high traction coefficient and excellent performances. SOLUTION: This ether compound is represented by general formula [1] (R1 is a 5-20C hydrocarbon group; X is a 1-4C alkylene; n is an integer of 0 or 1; R2s are each a group selected from a methyl group, an ethyl group, a propyl group and a butyl group and may be the same or different in the same molecule; p is an integer of 0-10). This fluid composition for traction drive is characterized by comprising the ether compound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel ether compound and a traction drive fluid composition containing the ether compound, and more particularly to a traction drive fluid having a high traction coefficient and excellent low-temperature fluidity. New ether compound, useful as
And a traction drive fluid composition containing the ether compound.

[0002]

2. Description of the Related Art Traction drive fluid is a fluid used for a power transmission mechanism by a traction drive. The traction drive fluid is used in a traction drive device such as a continuously variable transmission (CVT) of a vehicle.
It intervenes on the rolling contact surface, transmits power, and plays a role as a lubricating oil that prevents direct contact between the rolling elements. Since the traction drive is a rolling transmission, its mechanism is simpler than that of a gear transmission, and low noise and a smooth continuously variable transmission can be achieved. Therefore, development of an automobile traction drive is expected.

An important performance in a traction drive is a power transmission capacity, and a traction coefficient μ (μ = T / P) defined by a ratio of a tangential force (traction force) T to a normal load (normal force) P. The larger the traction coefficient, the larger the transmission capacity. Traction drive fluids are generally broadly divided into liquid lubricating oils and semi-solid or solid greases, but there are mineral oils and synthetic oils depending on the base oil used as the main component. Have been. Thus, in a traction drive device such as a continuously variable transmission, a traction drive fluid having a high traction coefficient is desired from the viewpoint of power transmission capability. In particular, in recent years, research on high performance or miniaturization and lightening has been advanced mainly for automotive applications, and traction drive fluids also exhibit high traction coefficient with practical properties such as excellent viscosity temperature characteristics and low temperature fluidity. Is required.

Conventionally, a traction drive fluid has been disclosed in Japanese Patent Publication No. 53-36105,
No. 11639, Japanese Patent Publication No. 5-87117, Japanese Patent Publication No. 5-88918, Japanese Patent Publication No. 6-31373, Japanese Patent Publication No. 7-47752, Japanese Unexamined Patent Publication No. Hei 6-2715.
No. 88, JP-A-7-242891, JP-A-9
Various compounds have been proposed in numerous patents and literatures, such as JP-A-59660 and JP-A-10-25489.

For example, Japanese Patent Publication No. 53-36105 proposes a power transmission method using a compound exemplified by 2,4-dicyclohexyl-2-methylpentane as a power transmission fluid. Japanese Patent Publication No. 5-87117 proposes a traction drive fluid composition in which polycyclohexylalkane is mixed with squalane or polyolefin oil. Japanese Patent Publication No. 5-88918 proposes a lubricant for a power transmission device having a traction drive mechanism, in which a phosphetane derivative is blended in a base oil in which a naphthenic hydrocarbon and polyisobutene are mixed. Japanese Patent Publication No. 6-31373 proposes a traction drive fluid in which cyclohexanol cyclohexanecarboxylic acid ester or a derivative thereof is mixed with polybutene. Japanese Patent Publication No. 7-47552 discloses a cyclopentadiene trimer to hexamer having a ratio of hydrogen amount (ND / CD) on a norbornene ring double bond to a cyclopentene ring double bond (ND / CD) of 0.9. A fluid composition for traction drive has been proposed in which a hydride of a cyclopentadiene-based condensed hydrocarbon having a molecular weight of 1.3 to 1.3 and a branched poly-α-olefin are mixed. JP-A-7-2428
No. 91 discloses a cyclopentadiene trimer to hexamer having a hydrogen content ratio (ND / CD) of 0.9 to 1.3 on a norbornene ring double bond and a cyclopentene ring double bond. A fluid composition for traction drive has been proposed in which a hydride of a cyclopentadiene-based condensed ring hydrocarbon is mixed with a dimer hydride of an α-alkylstyrene having 1 to 3 carbon atoms in an alkyl group. Further, JP-A-9-59660 and JP-A-10-25489 disclose a traction drive in which a dicyclohexyl compound and a thermal copolymer of cyclopentadiene and vinyl aromatic hydrocarbon or a hydride thereof are mixed. Working fluids have been proposed. Further, although there are some fluids for traction drive using a silicone-based compound, such fluids have been studied in Japanese Patent Publication No. 2-11639 and Japanese Patent Application Laid-Open No. 6-271588.
In the publication, a traction drive fluid using cyclohexylmethyl silicone is proposed.

However, in spite of these proposals, in addition to a high traction coefficient, there are few practical traction drive fluids. In particular, 2,
The dimer hydride of α-alkylstyrene exemplified by 4-dicyclohexyl-2-methylpentane has a high traction coefficient, but has poor fluidity at low temperatures, and is difficult to be practically used as a continuously variable transmission oil for automobiles. It has become. Therefore, development of a practical traction drive fluid having excellent low-temperature fluidity is strongly desired. Also, in general, the traction coefficient of ether oil is not so high, and it has never been used as a traction fluid, and there is no patent that uses ether oil as a traction fluid or a patent that mixes it with traction fluid.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a traction drive fluid composition which is excellent in low-temperature fluidity, has a high traction coefficient, and is practically excellent.

[0008]

Means for Solving the Problems The present inventors have conducted intensive studies to overcome the problems of the prior art, and as a result, a newly synthesized ether compound having a specific structure has a high traction coefficient and a high traction coefficient. Because of its excellent low-temperature fluidity, it has been found that a practically excellent traction drive fluid can be obtained when used as part or all of the base oil of the traction drive fluid. The present invention has been completed based on these findings.

That is, according to the present invention, there is provided an ether compound represented by the following general formula [1].

[0010]

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(Wherein, R ¹ represents a C ₅ -C ₂₀ hydrocarbon group, X represents an alkylene group having 1 to 4 carbon atoms,
Is an integer of 0 or 1, R ² is selected from a methyl group, an ethyl group, a propyl group, and a butyl group, and may be the same or different in the same molecule, and p is 0 to 10, preferably It is an integer of 0-6, more preferably 1-3. According to the present invention, there is also provided a traction drive fluid composition comprising the above ether compound.

As described above, the present invention relates to a specific ether compound and a traction drive fluid composition containing the ether compound.
Preferred embodiments also include the following. (1) The traction drive fluid composition described above, which is an ether compound represented by the general formula [1], wherein R ¹ is an alkyl group having a cyclohexyl ring. (2) The above traction drive fluid composition, which is an ether compound represented by the general formula [1], wherein R ¹ is an alkyl group having a norbornane ring. (3) 2,4-dicyclohexyl-2 base oil consisting of methyl pentane, or made an oligomer obtained by polymerizing C ₅ fraction composed mainly of cyclopentadiene from a component of average molecular weight 190 to 250 obtained by adding hydrogen group A fluid composition for traction drive, comprising a base oil composed of any one of the ether compounds described above mixed with an oil or a mixed base oil of both. (4) The traction drive fluid composition according to (3), further comprising a base oil composed of polybutene having an average molecular weight of 300 to 3500. (5) wear inhibitors, extreme pressure agents, friction modifiers, antioxidants,
The fluid for traction drive according to any of the above, further comprising at least one additive selected from the group consisting of a viscosity index improver, a detergent / dispersant, a metal deactivator, and an antifoaming agent. Composition. (6) The traction drive fluid composition according to (3), wherein the hydrogenated cyclopentadiene oligomer has an average molecular weight of 190 to 220. (7) The traction drive fluid composition according to any of the above, wherein the traction coefficient is 0.090 or more and the low-temperature viscosity at -40 ° C is 60 Pa · s or less.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. 1. Ether compound The ether compound according to the present invention has a specific structure represented by the following general formula [1].

[0014]

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(Wherein, R ¹ represents a C ₅ -C ₂₀ hydrocarbon group; X represents an alkylene group having 1 to 4 carbon atoms;
Is an integer of 0 or 1, R ² is selected from a methyl group, an ethyl group, a propyl group, and a butyl group, and may be the same or different in the same molecule, and p is 0 to 10, preferably It is an integer of 0-6, more preferably 1-3. )

The ether compound represented by the general formula [1]
The first structural feature is that ethers involving oxygen atoms
That is, the presence of a metal bond. The present inventors have
It is presumed that the function of oxygen atoms improves low-temperature fluidity.
I understand. Next, the second structural feature is the ether bone.
One of the cases has a norbornane ring, ie, bicyclo [2.
2.1] By having a heptane group, ether compound
That the object has a high traction coefficient. This
The lebornane ring has a methyl group, an ethyl group, a propyl group,
Or a substituent selected from butyl groups (R²)
And the substituents may be the same or different in the same molecule.
Is also good. The number (p) of the substituents is an integer of 0 to 10.
Yes, preferably R²Is a methyl group and p is
Preferably it is 0-6, more preferably 1-3. Ma
In addition, the ether compound has a high traction coefficient.
First, the other ether skeleton R¹Is C₅~ C
₂₀Hydrocarbon group, and furthermore, cyclohexyl
Ring or norbornane ring, or bicyclo [2.2.2]
Those having an octane ring are preferred.
A hydrocarbon group having a sil ring or a norbornane ring
C₆~ C₁₂Are particularly preferred. Cyclohe
As those having a xyl ring or the like,
As alkanes, C₆~ C₁₂Monocyclic or bicyclic
There are, specifically, for example, in monocyclic,
C₆~ C₈Are preferred, and C₆Cyclohexyl ring
(Cyclohexyl group) is particularly preferred. Also, these
Cyclohexyl ring and the like further have an alkyl having 1 to 6 carbon atoms.
And it may have a substituent such as a hydroxyl group. Also bicyclic
So, C₁₀Decalin or alk having 1 to 6 carbon atoms
And derivatives thereof having a substituent such as a phenyl group.
Substituent R¹Monocyclic and bicyclic ones
However, two or more kinds may be used as a mixture. Norvo
Has a lunan ring or bicyclo [2.2.2] octane ring
The monocyclic or bicyclic C7 to C16
And specifically, for example, in the case of monocyclic one,₇
~ C₈Are preferred, and C₇Especially the norbornane ring
preferable. In addition, these norbornane rings and the like further
May have a substituent such as an alkyl group having 1 to 6 carbon atoms.
Good. As the hydrocarbon group having a cyclohexyl ring,
Specifically, C₆H₁₁-CH ₂-Group or C₆H₁₁-CH
₂-CH₂-A group or the like. It also has a norbornane ring
Specific examples of the hydrocarbon group include C₇H₁₁-CH
₂-Group or C₇H₁₁-CH₂-CH₂-A group or the like.

Further, X of the ether compound represented by the general formula [1] of the present invention is an alkylene group having 1 to 4 carbon atoms, preferably a methylene group, an ethylene group, a dimethylmethylene group or a propylene group. Therefore, two or more kinds may be used as a mixture, and in the case of a mixture, random or block may be used. From the viewpoint of maintaining a high traction coefficient, n is 0 or 1.

The ether compound having a specific structure represented by the general formula [1], which is used as a base oil of the traction drive fluid composition of the present invention, is not particularly limited with respect to raw materials and production methods, and can be obtained by various methods. Although it is possible, it can be usually manufactured by the following method. As a raw material, for example, using cyclohexanemethanol as a compound corresponding to the R ¹ group of the general formula [1],
First, this is reacted with methanesulfonyl chloride to obtain cyclohexylmethylsulfonate. Then, under a stream of an inert gas such as argon, sodium hydride is added to, for example, norbornanemethanol, and the mixture is stirred at a low temperature. Then, the above-mentioned solution of cyclohexylmethylsulfonate in tetrahydrofuran is added, and the mixture is stirred and reacted. The reaction mixture is poured into ice water, extracted with a solvent such as ethyl acetate, washed with water, dried, evaporated, distilled under reduced pressure, and, if necessary, purified by a column to obtain a compound represented by the general formula [1]. An ether compound having a specific structure can be obtained. As another method, as a compound corresponding to the R ¹ group of the general formula [1], for example, cyclohexene is used, and an acid catalyst is added thereto.
The reaction is carried out by stirring at ℃ 120 ° C. for 3 to 15 days, and the reaction solution is washed with water, dried, and the remaining cyclohexene and the like are distilled off under reduced pressure. An ether compound having a specific structure can be obtained.

The thus-produced ether compound having the specific structure represented by the general formula [1] is excellent in low-temperature fluidity, has a high traction coefficient, is well-known for a known traction drive fluid, and is commonly used. Because of its excellent compatibility with additives for mineral oil, synthetic oil and lubricating oil, it is useful as a base oil for traction drive fluid compositions.

2. Traction Drive Fluid Composition The ether compound having a specific structure represented by the general formula [1] of the present invention can be used as a base oil of a traction drive fluid by itself, but may be a known traction drive fluid. Also used as a mixed base material. The base oil of the traction drive fluid used by mixing with the ether compound of the present invention includes,
-Dicyclohexyl-2-methylpentane. This 2,4-dicyclohexyl-2-methylpentane is a compound represented by the following structural formula [2], which is known as a traction drive fluid, and has an excellent traction coefficient, but is near -40 ° C. Has the disadvantage that the viscosity at low temperatures is high and the low-temperature fluidity is poor.

[0021]

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Other known base oils for mixing traction drive fluids include hydrogenated cyclopentadiene oligomers (CP oligomers) and polybutene.

[0023] As CP oligomers hydrogenated product is may be a known, preferably, there is an average molecular weight of 190 to 250, polymerization of C ₅ fraction composed mainly of cyclopentadiene That is, the main component is a hydrogenated product of a trimer and a tetramer of cyclopentadiene. A small amount of a dimer or less or a pentamer or more CP oligomer hydrogenated product may be contained. In general, when the average molecular weight of the hydrogenated CP oligomer is within the above range, the traction coefficient of the traction drive fluid can be made stable and high, and the average molecular weight is 19
If it is less than 0 or more than 250, the flash point decreases,
Alternatively, the low-temperature fluidity deteriorates. The average molecular weight of the hydrogenated CP oligomer is a weight average molecular weight and is calculated by the following method. First, the molecular weight of each individual component contained is determined using GC-MS. The GC-MS measurement conditions were as follows: column: HP-5MS, injection temperature: 250 ° C., ionization method: electron impact ionization, ionization chamber temperature: 250 ° C.
° C, and the ionization voltage is 70 eV. Next, using GC, the content ratio of each molecular weight component is determined from the area ratio of each peak, and the weight average molecular weight is calculated. The measurement conditions of GC are as follows:
The column was HP-1, the column temperature was raised from 50 ° C to 320 ° C at a rate of 10 ° C / min, the detector was FID, the injection temperature was 320 ° C, and the detector temperature was 320 ° C.
° C. To show a specific calculation example, for example, a molecular weight of 20
The component of No. 2 is 85% in GC area, and the component of molecular weight 267 is G
If the C area is 15%, 202 × 0.85 + 267 ×
0.15 = 212, and 212 is obtained as the average molecular weight.

The polybutene has an average molecular weight of 300
~ 3500 can be suitably used, and particularly preferably 600 ~ 1500. When the average molecular weight of the polybutene is less than 300, the evaporation loss at high temperature increases, and the change in the physical properties of the traction drive fluid due to evaporation increases. On the other hand, the average molecular weight of polybutene is 350
If it exceeds 0, the fluidity decreases and the low-temperature viscosity increases,
Low temperature fluidity deteriorates. The polybutene includes those saturated by hydrogenation of a carbon-carbon double bond. The polybutene is preferably polyisobutylene or a hydrogenated product thereof. In addition, polybutene is particularly suitable for 2,4-
Combination with dicyclohexyl-2-methylpentane can improve practical performance, such as oil seal rubber compatibility, while maintaining an acceptable high traction coefficient. The average molecular weight of polybutene is a number average molecular weight, and the number average molecular weight is calculated by the VPO method.

In one embodiment of the present invention, the above-mentioned 2,4-dicyclohexyl-2 is used as a base oil of a traction drive fluid composition mixed with an ether compound.
-Methylpentane, a hydrogenated cyclopentadiene oligomer having an average molecular weight of 190 to 250, polybutene, and the like are used. These base oils for mixing are required for the performance required for a traction drive fluid according to various uses. In addition, they can be used alone or in various combinations as appropriate. By blending an ether compound having a specific structure represented by the general formula [1] as a mixed base material with these base oils or a combination of these base oils, it is possible to obtain other properties such as viscosity and oil seal rubber compatibility. The low-temperature fluidity can be improved while keeping the traction coefficient high while taking into account the practical performance of.

The compounding ratio of the traction drive fluid composition of the present invention, that is, the ether compound having a specific structure represented by the general formula [1], is determined by the combination of various base oils according to the performance balance. It can be changed as appropriate. That is, by appropriately changing the compounding ratio of the ether compound of the present invention, the traction coefficient is kept high, the low-temperature viscosity is low, and it can be used even in cold regions or in winter, and can be used as a practical traction drive fluid. it can. For example, as the base oil, an ether compound having a specific structure represented by the general formula [1] of the present invention alone can be used, and the ether compound of the present invention and 2,4-dicyclohexyl-2-methylpentane can be used. When mixing is used, the mixing ratio can be appropriately changed according to the target low-temperature viscosity and traction coefficient, and 2,4-dicyclohexyl-2-methylpentane is used for 100 to 40% by weight of the ether compound. A range of 0 to 60% by weight is preferred. If the compounding ratio of the ether compound is less than 40% by weight, the low-temperature fluidity becomes insufficient.

The traction drive fluid composition of the present invention contains the ether compound having the above-mentioned specific structure as a base oil of the traction drive fluid, but ensures practical performance adapted to various uses. Therefore, if necessary, various additives used in power transmission oils for automobiles, for example, automatic transmission oils and transmission gear oils, that is, antiwear agents, extreme pressure agents, friction modifiers, antioxidants, and viscosities An index improver, a detergent / dispersant, a metal deactivator, an antifoaming agent, and the like can be appropriately added as long as the object of the present invention is not impaired.

The fluid composition for traction drive of the present invention has characteristics such as a high traction coefficient, low viscosity at -40 ° C. and excellent fluidity at low temperature. The traction drive fluid composition of the present invention usually has a high traction coefficient of 0.090 or more. Further, the fluid composition for traction drive of the present invention has a low-temperature viscosity at -40 ° C of 60 Pa ·
s or less, and can be used at low temperatures. That is,
When the device is operated in a cold region or in winter, the temperature may be 0 ° C. or less outdoors, or around −40 ° C. in some cases. Therefore, the fluid composition for traction drive of the present invention has excellent low-temperature fluidity, so that the traction drive device can be operated even under a low-temperature condition of around −40 ° C. The low-temperature viscosity at −40 ° C. is determined by ASTM.
It is a Brookfield viscosity measured with a Brookfield viscometer specified in D2983-80.

Furthermore, the fluid composition for traction drive of the present invention utilizes the above-described features to transmit power and directly contact rolling elements in a traction drive device such as an automobile continuously variable transmission. It can be suitably used as a lubricant that plays a role as a lubricating oil for preventing the oil. Moreover, since the traction drive fluid composition of the present invention has a high traction coefficient, as described above, the pressing load of the rolling elements can be reduced, and the fatigue life of the traction drive device body can be significantly extended. Therefore, the reliability of the device is improved, which can contribute to the miniaturization of the device.

[0030]

The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. The traction drive fluid compositions obtained in Examples and Comparative Examples were evaluated by the following methods.

1. Evaluation and measurement method of physical properties <Traction coefficient measurement device and measurement conditions> Four-cylinder traction tester Peripheral speed: 5 m / sec Sliding rate: 2% Average Hertz pressure: 1.0 GPa Roller temperature: room temperature The traction coefficient is 0.090. The above were the development goals. <Measurement Method of Low Temperature Viscosity> The Brookfield viscosity at −40 ° C. was measured with a Brookfield viscometer specified in ASTM D2983-80. Low temperature viscosity is-
Brookfield viscosity at 40 ° C is 60 Pa · s
The following are the development goals.

2. Example 1 Synthesis of ether compound having specific structure [Example 1] 1005 g of cyclohexanemethanol, 1068 g of triethylamine, and 5 L were placed in a reaction vessel.
Was cooled to 0 ° C. or lower, and 1216 g of methanesulfonyl chloride was slowly added dropwise thereto, followed by stirring for 3 hours. During dripping and stirring, 1
It was kept below 0 ° C. The reaction solution was filtered, and the precipitated
Washed with hexane. The solvent of the filtrate was removed and 140
2 g of cyclohexylmethylsulfonate were obtained. Next, 788 g of 3-methyl-2-norbornanemethanol and dehydrated tetrahydrofuran were placed in a reaction vessel under an argon stream.
Charge 9 L, cool to 5 ° C or less, and pay attention not to raise the temperature. Sodium hydride (60%) 27
2 g were added. After stirring at 5 ° C. or lower for 2 hours, 2 L of a dehydrated and dried tetrahydrofuran solution of 1300 g of the above cyclohexylmethylsulfonate was added dropwise at 20 ° C. or lower, followed by stirring for 1 hour, and further reacted at 60 ° C. for 14 hours.
The reaction product was poured into ice water, extracted with methyl acetate, washed with water, dried using magnesium sulfate, and then the solvent was removed. From this, low-boiling components (60 to 9
0 ° C./0.3 mmHg), followed by silica gel column purification (eluent n-hexane), and finally vacuum distillation (85-100 ° C./0.2 mmHg) to give a purity of 98.
% Of an ether compound represented by the following structural formula [3] was obtained in a yield of 36%.

[0033]

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Further, using borneol as a raw material,
In the same manner as above, an ether compound represented by the following structural formula [4] was obtained.

[0035]

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Example 2 A reaction vessel was charged with 1201 g of phensyl alcohol, 4033 g of cyclohexene, and 7 ml of concentrated sulfuric acid, and heated and stirred while refluxing at a reflux temperature of 84 ° C. On the way, add 60 ml of concentrated sulfuric acid
The reaction was continued for 10 days while adding in several batches. After allowing the reaction solution to cool, washing with water was repeated 5 times and dried over magnesium sulfate. After cyclohexene was distilled off under reduced pressure, silica gel column purification (eluent n-hexane) was performed, and further vacuum distillation was performed (95 ° C./1 mmHg), and the purity was 98%.
An ether compound represented by the following structural formula [5]
Obtained at 0%.

[0037]

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3. Traction Drive Fluid Composition Example 3 In Example 3, only the ether compound represented by the structural formula [5] obtained in Example 2 was used as the base oil based on the total amount of the traction drive fluid composition. 96.6
A fixed amount of each of the various additives shown in Table 1 in a total amount of about 3.4% by weight was formulated to prepare a traction drive fluid composition. Table 1 shows the measurement results of the composition and physical properties of the traction drive fluid composition.

Examples 4 to 6 In Example 4, 49.9 of the ether compound represented by the structural formula [3] obtained in Example 1 was used as a base oil based on the total amount of the traction drive fluid composition. % By weight of 2,4-dicyclohexyl-2-
40.9% by weight of methylpentane and an average molecular weight of 100
And 5.8% by weight of polybutene to prepare a traction drive fluid composition, and each of the various additives shown in Table 1 was formulated in a fixed amount. In Example 5, based on the total amount of the traction drive fluid composition, 38.2% by weight of the ether compound represented by the structural formula [4] obtained in Example 1 was added to the base compound as a base oil. 57.2% by weight of a hydrogenated pentadiene oligomer and 1.2% by weight of polybutene having an average molecular weight of 1,000 were mixed to prepare a traction drive fluid composition.
Each of the various additives shown in Table 1 was formulated in a fixed amount. In Example 6, 67.6% by weight of the ether compound represented by the structural formula [5] obtained in Example 2 was added to 2,4-dicyclohexyl- 67.6% by weight of 2-methylpentane and 8.7% by weight of polybutene having an average molecular weight of 1000 are mixed,
A fluid composition for traction drive was prepared, and various additives shown in Table 1 were formulated in fixed amounts. Table 1 shows the measurement results of the compositions and physical properties of these traction drive fluid compositions.

[Comparative Examples 1 to 3] Comparative Examples 1 and 2 correspond to base oils shown in Table 1, that is, Comparative Example 1 contains only 2,4-dicyclohexyl-2-methylpentane. A traction drive fluid containing only an ether compound having no cyclohexyl ring or norbornane ring (dioxyethylene dibutyl ether), and the same additives as in Examples 3 to 6 were formulated. Table 1 shows the measurement results of the composition and physical properties of the traction drive fluid composition. Comparative Example 3 is a commercially available traction drive fluid, trade name: Santotr
ac) 50 was evaluated for physical properties. Table 1 shows the measurement results of the physical properties.

[0041]

[Table 1]

From these evaluation results, it can be seen that a traction drive fluid composition having excellent low-temperature fluidity, high traction coefficient, and excellent practicality can be obtained by containing an ether compound having a specific structure as a base oil. There was found.

[0043]

According to the present invention, there is provided a traction drive fluid composition which is excellent in low-temperature fluidity, has a high traction coefficient and is practically excellent. INDUSTRIAL APPLICABILITY The traction drive fluid composition of the present invention is used as a lubricant that functions as a lubricating oil that transmits power and prevents direct contact between rolling elements in a traction drive device such as an automobile continuously variable transmission. can do.
Further, the fluid composition for traction drive of the present invention,
Since it has a high traction coefficient, is excellent in low-temperature fluidity and is practical, it can contribute to miniaturization of the device and reliability at a wider environmental temperature.

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) C10N 30:02 C10N 30:02 30:08 30:08 40:04 40:04 (72) Inventor Toshihide Omori Aichi, Aichi (1) Inside the Toyota Central R & D Laboratories Co., Ltd. (72) Inventor Arimitsu Ausumi Usuki 41-chome, the Oku-Chamu Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture Inventor Kedar Shankar Shrestha 1-3-1, Nishitsurugaoka, Oi-machi, Iruma-gun, Saitama Prefecture TonenGeneral Sekiyu R & D Co., Ltd. No. 1 TonenGeneral Sekiyu R & D Center (72) Inventor Shigehiko Yoshimura 1-3-1 Nishitsurugaoka Oimachi, Iruma-gun, Saitama Prefecture TonenGeneral Sekiyu R & D Center (72) Inventor Atsu Suzuki 1 Toyota Town, Toyota City, Toyota Motor Corporation (72) Who Kubono Kazushige Toyota City, Aichi Prefecture, Toyota-cho, Toyota first address Toyota Motor Co., Ltd. in the F-term (reference) 4H006 AA01 AA03 AB60 GP01 GP02 4H104 BB08A LA01 LA04 LA20 PA03

Claims (2)

[Claims] 1. An ether compound represented by the following general formula [1]. Embedded image (Wherein, R ¹ is a C ₅ -C ₂₀ hydrocarbon group, and X is
Represents an alkylene group having 1 to 4 carbon atoms, n is an integer of 0 or 1, and R ² is selected from a methyl group, an ethyl group, a propyl group, and a butyl group; P may be an integer from 0 to 10. ) 2. A traction drive fluid composition comprising the ether compound according to claim 1.