JPS6035096A - Operating oil - 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] The present invention relates to a hydraulic fluid containing a silane derivative.

Hydraulic oil 1°, which is based on glycol ether, has been used for many years in automobile brake and clutch systems and is the most widely used oil. However, oil field manufacturers and the Society of Automotive Engineers
Automotive Engineers),
- Varnish Department of Transportation (IJ, S.Dopa.rtment of Tr.
The quality standards set by public institutions such as Ansportatlqn are becoming increasingly strict. In particular, there is an increasing demand for higher boiling point hydraulic fluids and, more importantly, manufacturers are increasing their demand for higher boiling point hydraulic fluids. Higher paper lock temperatures are required for both hydraulic fluids that are formulated as J:5 and those that are also used in the presence of water. Glycol ether-based oils are known to absorb moisture from the atmosphere due to their hygroscopic nature7 and are therefore unsuitable for such requirements. The water absorption lowers the boiling point and paper rock temperature of the hydraulic fluid, and with use, the water content of the hydraulic fluid reaches such a standard that the boiling point and paper rock temperature drop to a dangerous level. if,
When it encounters the heat generated when applying strong brakes, the hydraulic fluid boils or evaporates, causing significant brake malfunction.

In order to solve this problem, low hygroscopic hydraulic fluids based on glycol esters have also been developed. Although this fluid is relatively insensitive to atmospheric moisture, it is more expensive than glycol ether-based oils and has technical drawbacks, such as its viscosity characteristics that differ from glycol ether-based oils. inferior to. Therefore, the use of such a low moisture absorption lubricant can reduce the desired high boiling point,
Only in cases where properties such as high paper rock temperature outweigh the disadvantages. Other moisture-insensitive hydraulic fluids have also been developed. However, manufacturers are trying to combine the good properties of both glycol ether-based oils and low moisture absorption. In addition, new hydraulic oils with even higher boiling points and paper lock temperatures than low-moisture lubrication oils are being introduced.

Recently, there has been a tendency to design cars in which power steering, shock absorbers, and brakes, which used to be operated by separate hydraulic systems, are operated by a single hydraulic system. This has important implications for the formulation of suitable hydraulic fluids.

Up until now, we have used Power Gonna Tea Risig series and shock absorbers.
Mineral oil-based oils used in systems can be used satisfactorily for nitrile rubber and chloropropylene rubber used for seals and gaskets in these systems, but hydraulic brakes and clutch systems (natural rubber, styrene/puttadiene rubber used in As a result, the seals of the latter expand abnormally, resulting in significant malfunction of brake and clutch systems. Hydraulic fluids based on , glycol ethers, and glycol ether esters are harmful to nitrile rubber and chloropress rubber used in power steering and shock absorbers, causing malfunction of these systems. Reliability of operation (which is desired in all mechanical devices) is emphasized as an essential condition from a safety perspective.Therefore, this requirement is imposed on the central system that controls the operation of various devices. It is also given for hydraulic fluids that are used satisfactorily.

The inventors have discovered that certain silicon compounds are useful as components of hydraulic fluids used in hydraulic brakes, clutch systems, and central hydraulic systems. These compounds improve the expansibility of various natural and synthetic rubbers used in oilfield structures and are relatively water-insensitive.

The compound has the formula rt-^i, -R4(■) (')It3 [wherein (a) Rif, it; -(OR5)ITl-Of
(Group indicated by !'-.

(b) It! and TL2 are each lower alkyl, -0
R3 or H,'-(Oltu 1m-□IL6- group: (C) I(pij, same 47'c fd
A 71 te, R'-(ORPIB, -te group).

(6,) +t' is the same or 7hi is different, and the number of carbon atoms is 1
-18 alkyl; (e) ] (4 is the same or different, ethylene or propylene; (f) R6 is the same or different, an alkylene having up to 6 carbon atoms; ()l;) m is the same' TF or different, 0 or an integer from 1 to 4.

This is a silane derivative represented by Formula (i) where m is other than 0
The silane derivative of is a new compound.

When this silane derivative is used in hydraulic brake and clutch systems, the terminal alkyl group must have a relatively short chain, e.g. 1 to 4, more preferably 1 or 2 alkyl is preferred. However, for central system applications, it is desirable to meet the often competing requirements of each type of seal or gasket. In this case, some or all of the terminal alkyl groups may be longer chain alkyls, such as those having up to 6, sometimes as many as 8 carbon atoms. In oils, even longer chain terminal alkyl groups, e.g.
The terminal alkyl group may be either straight chain or branched, but from the viewpoint of oil solubility, it is necessary to use 18, sometimes 18, especially for mineral oil). Branched alkyls are preferred.

The silane derivative of the present invention can be easily produced from a suitable haloalkylsilane by a known method.

The silane derivatives are used as additives in hydraulic fluids, base oils or as a component of base oil mixtures. The number of months varies over a wide range, ranging from 0.5% to 99% (by weight, the same applies hereinafter) based on the total amount of hydraulic fluid. When used as a base oil, this silane derivative becomes the main constituent of the hydraulic fluid and, based on its total weight, is e.g.
Included in the range of 9. The remainder is known hydraulic fluid additives and/or other hydraulic fluid base oils.

When used as a component of a base oil mixture, the entire base oil mixture becomes the main component of the hydraulic fluid, in which case the base oil consists primarily of one or more silane derivatives, including: Incorporating smaller amounts of one or more other base oils to modify the properties, the hydraulic oil may contain one or more silane derivatives, e.g. Contains 75%. A smaller amount of a silane derivative may also be mixed in to modify the properties of one or more other base oils, in which case the hydraulic oil contains, for example, 20 to 40% of the silane derivative. Furthermore, in order to balance the properties of the silane derivative and other base oils, they may be mixed in approximately equal amounts so that the silane derivative content is 40 to 55%.

In addition, when used to suppress the sensitivity of hydraulic oil to water, especially regarding its boiling point and pH lock temperature, the 7-run derivative is used in a range of 20 to 50%, more preferably 20 to 40%. is desirable. moreover,
Although smaller amounts of the silane derivative, such as 0.5-15% or even up to 20%, can have an improved effect, the higher doses mentioned above are more preferred. The main component of the hydraulic oil in this case is one or more of the other base oils described below.

When a silane derivative is used as one component of a base oil mixture, known hydraulic oil additives may be added, as in the case of a base oil consisting essentially of a silane derivative. Similarly, when used as additives, silane derivatives may be used in combination with other known hydraulic fluid additives, if desired.

Known additives are usually used in small amounts in the range 0.05-10%, for example 0.1-2%.

Examples of base oils that can be mixed with silane derivatives or in which silane derivatives can be used as additives include mineral oils, polyoxyalkylene glycols and their ethers, mono-, di- or polycarboxylic acids, or alkyl and polyoxyalkylene boronic acids. Included are resin glycol ether esters, formals, acetals, phosphate esters, silicones, monocarboxylic acid esters of di- or polyalcohols, and other known base oils.

In one preferred embodiment of the present invention, the formula (T)
5 to 30% of at least one silane derivative of the following formula % () () [wherein all is alkyl (preferably carbon number 1 to 18
alkyl) or aryl (preferably phenyl)
, B+2 is alkyl (preferably alkyl having 1 to 18 carbon atoms), aryl (preferably phenyl), alkaryl (preferably phenyl substituted with alkyl having 1 to 12 carbon atoms), aralkyl (preferably benzyl), or R1 -(OR5)□-, B+3 is alkyl (preferably alkyl having 1 to 18 carbon atoms), aryl (preferably phenyl), alkanol (preferably phenyl substituted with alkyl having 1 to 12 carbon atoms) , aralkyl (preferably benzyl) or R'-(OR5
) A group represented by □-〇-: 14, R5 and m are the same as those defined for formula (I) I/C] At least one of the known base oil compounds represented by 5-
To provide a hydraulic oil which is blended with 30% Lafrycol ether base oil.

In yet another preferred embodiment, substantially the formula (1)
At least one silane derivative of formula (n
), (III) or (IT)
Hydraulic oils consisting of species 90-10q6 are provided.

In either composition, the hydraulic oil of the present invention is
Kinematic viscosity at O is 5000 cat, Nakanzugu 2000
It is desirable not to exceed cst. Furthermore, it is preferred that the hydraulic oil of the present invention has a boiling point of at least 260°C.

In yet another aspect of the invention, the above-mentioned hydraulic fluid is used as a functional fluid.
), it provides a hydraulic system for transmitting all power by hydraulic means.

In yet another aspect, there is provided a method for operating a hydraulic system, which comprises introducing the above-mentioned hydraulic oil into the hydraulic system, applying pressure to the hydraulic oil, and transmitting power.

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 In a glass flask fitted with a 1 foot packed column,
Tris(methoxy)-310+=+7” 94g (4 moles) of methyl triglycol and 2296gC
14 mol) of methanol is extracted from the mixture with 188 mol of methanol
．． 1,! Heat under nitrogen atmosphere until li' is removed. The drain was removed and heating was continued at a minimum temperature of 200°C to yield 317.4 g of reactant (theoretical value: 38
4g).

After dissolving 101.2 g (4.4 gram atoms) of sodium in methyl triglycol (100 O, 1 mole) and adding the resulting slurry to the above reaction mixture, 100
Hold at ℃ for 3 hours. The product is taken out of the furnace and the minimum temperature is 180℃.
Distilled at 0.01°C and filtered again.

S1 content 420% [Tris (methyl triglycol)-
A dark liquid with theoretical S1 content of 3-methyltriglycolpropylsilane: 388% is obtained.

This product has a boiling point of 320°C1 a viscosity of (-40″0)23
Has 06 c8. This thing is 5BRG, (42%)
Rubber expansion t'l test was performed on Natural R32 (-10%) and good results were obtained.

Example 2 Tris(methoxy)-3-chloropropylsilane 198.5. ! i! (1 mol), methyl diglycol 398 g (3.3 mol) and sodium 2
! l (1,1 gram atom) of methyl diglycol 401
(3.4 mol) to obtain tris(methyldiglycol)-3-methylcycricolglopylsilane.

77 g of methanol (theoretical amount = 96 g) are collected in the first step. Si content 6092% (theoretical value: 512%),
409 g (75%) of product with a chlorine content of 0.2% are obtained. This product has a viscosity (-40'0) of 1051c8.
It has a boiling point of 310°C and gave good results in rubber expansibility tests with 8BRG9 (8.9%) and Natural R32 (2.0%).

Example 3 In the same manner as above, 397 g (2 mol) of 3-chloropropyl-trimethoxysilane and 1400 g of tridecanol were added.
(7 mol), p-toluenesulfonic acid 082 g and sodium 50.6 g (2,2 gram atoms) in tridecanol 8oO=<(4 mol) to prepare tris(trimethoxy)-3-tridekatsuki dipropyl Take silane. Methanol 16 B,! i+' (theoretical amount: 192g) can be changed.

Product 71 with S1 content of 3.46% (theoretical value: 323%)
1g (82%) can be exchanged.

A blend of this product (50%) with DTD 585 mineral oil (50%) has a viscosity (-40°C) of 2313 as, and after heating with 0.5% H20 at 100°C for 72 hours, the paper lock The temperature was 225°C.

Examples 4-26 The hydraulic oil of the present invention was subjected to the following tests.

(a) Kinematic viscosity (-40°c) - e centistokes (cs
) was measured using the method described in the 5AE1703C specifications.

(b) Comb expandable i-styrene/butadiene rubber (SBJ
, nitrile rubber and ethylene/propylene rubber. For SBR, FMVS S l l 5
Standard SAE 5 by the method described in DOT3/4 specifications @
This was done using an I3R cup. The rubber expansibility of nitrile rubber is Nido! J/I/Near'), test piece (2
54α angle, 2mm thickness) in test solution 50-120°C.
This was determined by the increase in capacity when held for 70 hours. For ethylene/propylene rubber, the procedure was the same as for nitrile rubber, except that an ethylene/propylene rubber ring seal such as that used in the aircraft industry was used.

(C) Paper lock temperature is FMVss of the test liquid.
Measurements were made after subjecting the sample to a humidity test as described in the 116 specification (without using a control solution).

For hydraulic fluids made of glycol ether base oil,
The Markey Vapou Test is conducted by the equipment and method described in the SAE J1705 Specification for Silicone Brake Fluids.
r Lock Te5t ) The VC lock temperature was measured. The PaperLock temperature of non-glycol ether-based oils is determined by the Gilvin PaperLock test ((311pin'VapourLock Te5t
). The Girbishi paper rock temperature is the temperature at which bubbles 3@ occur.

(,i) Hydrolytic stability was measured as follows.

That is, add 10% water to the test solution, and add 10% water in a sealed ampoule.
After heating at 00°C for 24 hours, the mixture was cooled and checked for gelation or separation. Silanes of formula (n), (III) or (mV) alone or in mixtures with glycol ether base oils generally gel under such conditions.

These results are shown in Tables 1 to 3. The abbreviations and commercially available products in the table mean the following.

Butyl monoglycol: Ethylene glycol monobutyl ether DPM: Dibropylene glycol monomethyl ether MTG: )! J ethylene glycol monomethyl ether MDG, diethylene glycol monomethyl ether mineral oil A: naphthenic acid mineral oil, viscosity: 130 cs (-
40°F), 3.5Q8 (100°F), 1.31cS
(210°F); Pour point: 〉-70°F: Boiling point: 248
°C: Flash point: 208 °C near aniline point 6 °C Mineral oil D: Ditridecyl dodecanedioate refrigerant oil B
: Commercially available refrigerant oil (Br1tish Petroleum
ZERICE 853), which is considered to be a mixture of alkylated benzenes.

Refrigerant oil C: 1 product of naphthenic acid mineral oil, relative density: 0.9
20; Viscosity + 63.0cS (100°F), 6.1c
S (210°F); Flash point = 183°C: Pour point knee Pour point knee 3f (Dow Corning 02-1062) E55
5: Commercially available ethylene/propylene glyco-19 ether (DOW Ohemj.cal Co.
), molecular weight: approximately 243: The terminal ether argyl group is thought to be mainly methyl, but a portion is thought to be ethyl.

A79 Nitrile Rubber 2 A commercially available nitrile rubber used in Girling brake systems.

(e) (21) ni) (23) (separate) Table 3 (25) Continuation of page 1 QlnL, CI,' Identification code Office reference number 0 Inventor Gerald John British Impi Joseph Giane 6 Walkingga Drive, Berkshire, Berkshire

Claims (4)

[Claims] (1) Formula % Formula % () [In the formula, 几 is a group represented by R4 (on51m-on%-; R1 and R2 are each lower alkyl, -0R3 or w-(OR5+m-or-); W is the same or different and is a group represented by Ti'-(OR5)Irl-;
18 alkyl, 115 is the same or different, ethylene or propylene, R6 is the same or different, alkylene having up to 6 carbon atoms, the same or different, means O or an integer from 1 to 4] A hydraulic oil containing at least one type of Shirashi derivative represented by 05 to 99% by weight based on the total amount. (2) Hydraulic oil according to claim (1), containing at least one known hydraulic oil additive and/or base oil. (3) 5 to 30% by weight of at least one of the compound (I)
and formula % formula % (1) [wherein B11 is alkyl or aryl, RI2 is alkyl, aryl, alkaryl, aralkyl or R
Group represented by 4(ORE)□-: R13 is alkyl, aryl, alkaryl, aralkyl or R4-(OR
5 to 30% by weight of at least one of the compounds represented by 'l□-0-te group: B, 4, H, 5 and mFi (same as described in claim (1))] is added to a glycol ether. Claim No.
1) Hydraulic oil. (4) Claim No. 3 consisting of 10 to 90% by weight of at least one of the compounds () and 90 to 10% by weight of at least one of the compounds of formula (11), (■) or (IT) ) Hydraulic oil.