CH629250A5 - Hydraulic fluid - Google Patents

Description

The present invention therefore relates to a hydraulic fluid which comprises at least one silane derivative which has the following general formula I

(I)

has, in this formula

(a) R is a grouping of the formula R4- (OR5) m-OR6-,

(b) the radicals R1 and R2 independently of one another alkyl radicals, preferably alkyl radicals with 1-18 carbon atoms and particularly preferably methyl radicals, or alkenyl radicals, preferably alkenyl radicals with 2-18 carbon atoms, aryl radicals, preferably phenyl radicals, alkaryl radicals, preferably alkyl-substituted phenyl radicals, in which the Alkyl radical has 1-12 carbon atoms or aralkyl radicals, preferably benzyl radicals or groups of the formula -OR3 or groups of the formula R4- (OR5) m-OR6,

(c) R3 is a grouping which has the formula R4- (OR5) m or

R8 - L - <OR \ -I 9

where the radicals R3 occurring in these formulas can be identical to or different from one another,

(d) R4 is an alkyl radical, preferably an alkyl radical with 1-18 carbon atoms, an alkenyl radical, preferably an alkenyl radical with 2-18 carbon atoms, an aryl radical, preferably a phenyl radical, an alkaryl radical, preferably an alkyl-substituted phenyl radical, in which the Alkyl substituent has 1-12 carbon atoms or is an aralkyl radical, preferably a benzyl radical, and the radicals R4 appearing in the formulas given above are identical or different from one another,

(e) R5 is an alkylene group, preferably an alkylene group with 1-15 carbon atoms and in particular 1-4 carbon atoms and very particularly preferably an ethylene group or a propylene group, the radicals R5 appearing in the above structures again being either identical to or different from one another ,

(f) R6 is an alkylene group, preferably an alkylene group with 1-15 carbon atoms and particularly preferably such a grouping with 1-6 carbon atoms, and radicals R6 appearing in the above formulas can again be either identical to or different from one another,

(g) m is zero or an integer, preferably zero or an integer in the range from 1 to 4, where in the above structures the symbols m can again be the same or different from one another,

(h) the radicals R7 and R8 independently of one another alkyl radicals, preferably alkyl radicals having 1-18 carbon atoms and particularly preferably methyl radicals, alkenyl radicals, preferably alkane radicals

4th

5

10th

15

20th

25th

30th

35

40

45

50

55

60

65

5 629250

nyl radicals with 2-18 carbon atoms, aryl radicals, preferably lie in the same way as the majority of the hydraulic fluids-phenyl radicals, alkaryl radicals, preferably alkyl-substituted powders. In this case, the base materials may be nyl radicals in which the alkyl substituent 1-12 carbon consists mainly of one or more silane derivatives, or aralkyl radicals, preferably benzyl radicals, which have smaller amounts of one or more other basic radicals or a grouping of the formula -OR9 or a group of 5 materials are mixed so that the properties of the fragments of the formula mean R4- (OR5) m-OR6-, and the silane derivatives are modified. Accordingly

(i) R9 is a grouping of the formula R4- (ORs) m-, and such hydraulic fluids can be, for example, the radicals R9 55-75% by weight of one or more of the structures according to the invention appearing in the above structures being identical to or different from one another may be used using silane derivatives, based on the total Ge and at least one further component. i o importance of the hydraulic fluid. On the other hand

The silane derivatives which can be modified in accordance with the invention preferably have one or more other basic materials modified by not more than 2 silicon atoms by being treated with smaller amounts of the

Molecule. mixed according to the silane derivatives to be used, so that

If the silane derivatives are used in hydraulic brake systems in this case, then hydraulic fluids are obtained and hydraulic clutch systems are used, 15 den, for example 20-40% by weight, based on the weight, then it is preferable that all terminal alkyl groups, of the hydraulic fluid to which relatively short-chain alkyl group-containing silane derivatives appear, which can be found in the molecule according to the invention. Furthermore, a pen can be d. H. For example, alkyl groups with 1 -4 carbon compromise between the properties of the silane derivatives atoms, and particularly preferably alkyl groups with 1 or 2 carbon and the other liquids can be achieved by using lenstoffatomen. This is necessary in order to mix the approximately equal amounts exerted on the rubber, and this swelling effect in the seals and sealing ring trap then gives hydraulic fluids which contain 40-55% by weight of those used in such systems are kept as low as possible to the silane derivatives to be used according to the invention. If, however, keep such liquids in the center.

central systems, then it can be desirable if the silicon compounds to be used according to the invention are

It would be more worthwhile to use a compromise between the individual inventions in order to remove the sensitivity from this, whereby often with this compromise solution hydraulic liquids against water suppressed conflicts regarding the different sealing materials, especially the water sensitivity of the hydraulic materials and materials of the sealing rings arise, which are used for the liquids seen with regard to influencing the boiling point of different seals. At this point and the temperature of the formation of vapor bubbles in the case, some or all of the terminal alkyl groups 30 of the liquid may then be the longer chain alkyl groups to be used in the present invention, i.e. H. those with up to 6 or Zenden silanes preferably used in amounts that are even 8 carbon atoms. In addition, in the case where a range of 20-55% by weight, and in particular in the range of mineral oil-based liquids, is used, even 20-40% by weight, based on the weight of the hydraulic materials with even longer-chain terminal alkyl groups, Liquids. On the other hand, an improvement can be used, for example those in which the 35 tion can also be obtained by using smaller amounts of the alkyl groups up to 16 carbon atoms or up to 18 kohesilane derivatives, for example amounts which have in the range of carbon atoms, because these long-chain end-of-range 0.5-15% by weight or up to 20% by weight, based on the alkyl groups, may be necessary to achieve the required total weight of the hydraulic fluids. To achieve oil solubility. The terminal alkyl groups of the majority of hydraulic fluids of this type can be either straight-chain or branched-chain, but then consist of one or more of the base materials which are described in more detail in consideration of the oil solubility and in particular that of the following.

Solubility in mineral oils are branched-chain alkyl groups if the silane-deri to be used according to the invention is preferred. vate as a component of a mixture of basic liquid

If the silane derivatives to be used in accordance with the invention are used, then the hydraulics obtained can easily contain conventional additives for hydraulic fluids, starting from the corresponding haloalkyl liquid, using known working methods, in the same manner as that of the The case is when the poses. Basic liquid essentially from the mentioned silane

The new silane derivative derivatives to be used according to the invention exist. In the same way, the invention can be used in hydraulic fluids as additives or as moderate silane derivatives, if they are used as an additive to a base material or as a component of a mixture of 50 hydraulic fluids, if necessary in base materials. The amounts in which combination with customary additives for hydraulic liquid - these materials can be used - vary accordingly.

speaking over a very wide range, d. H. they range from Usual additives are normally used in small amounts of 0.5% to 99% by weight based on the total weight of the, such as 0.05-10% by weight, e.g. hydraulic fluid. If the materials are used as a base material, 0.1 to 2 wt.

they generally make up the bulk of the hydraulic base fluids with which the silane derivatives liquefy, and they can be mixed, for example, in this or in which they are added in amounts of 75% by weight or 80% by weight. up to 99% by weight, based on ben, are, for example, mineral oils, polyoxial, based on the total weight of the hydraulic fluid, contain 60 kylene glycols and ether of these compounds, alkyl and. The rest of the hydraulic fluid can consist of conventional polyoxyalkylene glycol ether esters of monocarboxylic acids, additives for hydraulic fluids and / or of dicarboxylic acids and polycarboxylic acids or also of small quantities of other basic materials for hydraulic acid, formaldehyde acetals (formals), acetals, phosphate esters, Liquids. Silicones, esters of monocarboxylic acids with dialcohols or

When the new silicon alcohols and similar liquids to be used according to the invention, which are known to the person skilled in the art for this compound as a component of a mixture, are of basic use.

materials for hydraulic fluids are used. According to a preferred embodiment of the invention, the entire mixture of such basic materials - this relates to a hydraulic fluid which essentially

629250

6

from a mixture of 5-30% by weight of at least one silane derivative of the formula 1 given above and 5-30% by weight of at least one compound of the following formulas II or III or IV or a mixture of compounds of the formula II, III or IV

, 11

OR12 - Si - OR12

12th

> 11

11 '19

R - Si - OR 10

OR

(II)

OR

(III)

12

, 11

12 ORA ^

I.

Si - O Ì13

T

"12

Si - R Ì13

11

(IV) 20

exists, in these formulas

R "is an alkyl radical, preferably an alkyl radical with 1-18 carbon atoms, or an aryl radical, preferably a phenyl radical,

R12 is an alkyl radical, preferably an alkyl radical with 1-18 carbon atoms, an aryl radical, preferably a phenyl radical, an alkaryl radical, preferably an alkyl-substituted phenyl radical in which the alkyl substituents have 1 to 12 carbon atoms, or an aralkyl radical, preferably a benzyl radical, or a grouping of the formula

25th

30th

35

R4- (OR5) m-

40

45

50

is

R13 is an alkyl group, preferably an alkyl group having 1-18 carbon atoms, an aryl group, preferably a phenyl group, an alkaryl group, preferably an alkyl-substituted phenyl radical in which the alkyl substituent has 1-12 carbon atoms, or an aralkyl group preferably a benzyl radical, or a grouping of the formula

R4- (0R5) m-0-

means, and

R4 and R5 and m have the meaning given above,

as well as a glycol ether as a base material.

The hydraulic liquids according to the invention can also essentially consist of 10-90% by weight, based on the total weight of the hydraulic liquid, of at least one silane derivative of the formula I given above, and 90-10% by weight, based on the weight the hydraulic fluid, at least one compound of formulas II, III or IV given above.

Regardless of the exact composition of the hydraulic fluids, it is extremely desirable

if the hydraulic fluids according to the invention have a kinematic viscosity at −40 ° C. of not more than 5000 cSt, preferably not more than 2000 cSt. It is also desirable if the hydraulic fluids have a boiling point of at least 260 ° C.

The hydraulic fluids according to the invention can be used in hydraulic systems for power transmission with the aid of hydraulic means. For this purpose, a hydraulic fluid according to the invention is introduced into the hydraulic system, and the power transmission takes place by exerting pressure on the hydraulic fluid.

The invention will now be explained in more detail by means of examples.

Examples 1, 2 and 3 describe processes for the preparation of silane derivatives of the formula I which can be used in the hydraulic fluids according to the invention.

example 1

794 g (4 moles) of tris (methoxy) -3-chloropropylsilane and 2296 g (14 moles) of methyl triglycol were heated under a nitrogen atmosphere in a glass flask, which was filled with a 30.48 cm (1 foot) column is equipped until 188.1 g of methanol were removed from the mixture. The column was then removed and heating was continued at a bottom temperature of 200 ° C. until 317.4 g (calculated value 384) had been obtained.

101.2 g (4.4 gram atoms) of sodium were dissolved in 1000 g (6.1 moles) of methyl triglycol and the resulting slurry was added to the reaction mixture, which was left at a temperature of 100 ° C. for 3 hours. The product obtained was filtered off, stripped under a pressure of 0.1 mm of mercury at a bottom temperature of 180 ° C. and then filtered again

This gave 2660 g (92% of theory) of a dark colored liquid which contained 4.20% of silicon. The calculated silicon content for the tris (methyltriglycol) -3-methyl-triglycolpropyl-silane) is 3.88% Si. The product obtained had a boiling point of 320 ° C and a viscosity at -40 ° C of 2306 cSt. Good results were obtained in the rubber swell tests, namely a swelling of 4.2% when using SBR G9 and a swelling of -1.0% when using natural rubber (Natural R32).

Example 2

The tris (methyldiglycol> 3-methyldiglycolpropyl-silane) was prepared in a similar manner, starting from 198.5 g (1 mole) of tris (methoxy) -3-chloropropylsilane, 396 g (3.3 moles) of methyl diglycol and 25 g (1.1 gram atoms) of sodium in 400 g (3.4 moles) of methyl diglycol.

In the first stage, 77 g of methanol (calculated value 96 g) were collected. This gave 409 g (corresponding to 75% of theory) of a product which contained 6.092% by weight of Si (calculated value 5.12% by weight of Si) and 0.2% by weight of chlorine. The product had a viscosity of 1051 cSt and a boiling point of 310 ° C at -40 ° C. It gave good results when the rubber swell tests were performed, namely SBR G9 swelling of 8.9% and natural rubber (Natural R32) swelling of 2.0%.

Example 3

The tris (tridecanoxy) -3-tridecanoxypropyl silane was prepared in a similar manner, starting from 397 g (2 moles) of 3-chloropropyl trimethoxy silane and 1400 g (7 moles) of tridecanol and 0.2 g p-toluenesulfonic acid and 50.6 g (2.2 gram atoms) of sodium in 800 ml (4 moles) of tridecanol. The reaction gave 168 g of methanol and the corresponding calculated value is 192 g. 711 g of the product, corresponding to 82% of the theoretical yield, were obtained and the material had a silicon content of 3.46%, the calculated value being 3.23%.

A mixture of 50% by weight of this product with 50% by weight of mineral oil DTD 585 had a viscosity of 2313 cSt at -40 ° C. The temperature of the vapor bubble formation after heating with 0.5% water at 100 ° C for 72 hours was 225 ° C.

The following examples 4 to 26 show how

7,629,250

Development of hydraulic fluids according to the invention Vapor Lock Tests determined and this test has been described in one, and the tested property apparatus are also carried out in the same manner as explained in the th of these hydraulic fluids. Specification SAE] 1705 for silicone brake fluids. The temperature for vapor bubble formation Examples 4-26 5 of liquids that have a base other than glycol ether

In Examples 4-12, the stated amounts of base were determined according to the Gilpin Vapor Lock Test, silane derivatives of the formula I in triethylene glycol monomethyl, specifically as dissolved in SAE Paper 710 253 ether, abbreviated as MTG. The hydraulic fluids thus obtained, under the title “Operating performance of motor vehicle brake fluids, had the king systems as affected by fluid water content” shown in Table 1, and they were tested for their rubber swelling and their viscosity. The temperature of the vapor bubble formation after the vapor bubble formation was tested. The Gilpin Vapor Lock Test results obtained as that temperature are also shown in Table 1. give, where 3 ml of vapor bubbles had formed.

The hydrolytic stability was determined by carrying out silane derivatives of the formula I in the test liquid listed therein plus 10% water in a sealed base oil in the stated proportions Leave the ampoule at 100 ° C. for 24 hours and then the hydraulic fluids according to the invention obtained in this way when cooled, neither any gel formation nor any deposits had the viscosities given in Table 2. material occurred. The silanes of formulas II, III and IV were also based on their rubber swelling and on their own or in a mixture with base materials on glycol

Vapor formation temperature has been tested, and the ether base obtained in this way normally forms results under these conditions are also summarized in Table 2.

poses. The exact information about the tested liquids

In Examples 22-26 hydraulic fluids and the results obtained are described in the following tables, which were prepared by compiling the table 3 len 1 -3.

The silane derivatives of the formula I listed with the abbreviations used in Table 3 which were used for the further component listed for the commercially available products or the 25 listed there and which mixed the further components listed in Tables 1-3 below. The hydraulic shafts thus obtained are as follows:

liquids have been tested for their hydrolytic resistance - butyl monoglycol - ethylene glycol monobutyl ether. DPM - dipropylene glycol monomethyl ether

The inventive MTG - triethylene glycol monomethyl ether hydraulic fluids described in Examples 4-26 were subjected to one or more 30 MDG - diethylene glycol monomethyl ethers of the following tests: Mineral Oil A - naphthenic mineral oil, which has a viscosity a) The kinematic viscosity of the hydraulic Liquid of 130 cSt at -40 ° C (-40 ° F) and viscosity at -40 ° C was determined in cSt in the manner of 3.5 cSt at 37.8 ° C (100 ° F) has, and also a viscous - as specified in the SAE 1703 c specification. 1.31 cSt at a temperature of 99 ° C (210 ° F).

b) The rubber swell properties were determined for styrene / buta- 35 Furthermore, this product has a pour point of -56.7 ° C diene rubber (SBR), nitrile rubber and ethylene / propylene rubber (-70 ° F), a boiling point of 248 ° C and a flash point certainly. When using styrene / butadiene rubber of 208 ° C and an aniline point of 76 ° C on.

the test was carried out in standardized SAE SBR trays in the manner of Mineral Oil D - Ditridecyl dodecanedioate as described in the specification FMVSS Réfrigérant Oil B - A commercially available cooling oil described by 116 DOT 3/4. The rubber source properties of 40 British Petroleum under the brand name ZERICE S with respect to nitrile rubber were determined by selling the 53 and is believed to be a mixture of volume expansion of a nitrile rubber, alkylated benzene specimen.

which was 2.54 cm square and 2 mm thick, oil in 50 ml of the liquid to be tested to Réfrigérant Oil C - A mixture of naphthenic mine at 120 ° C for 70 hours. The relative density is 0.920, the viscosity at certain. The tests for ethylene / propylene rubber 45 37.8 ° C (100 ° F) 63.0 cSt, the viscosity at 99 ° C (210 ° F) 6.1 cSt were carried out in the same manner as for the the open flash point is 183 ° C and the pour point - 36 ° C.

Nitrile rubber is specified, but silicone fluid ring seals - A commercially available silicone brake fluid ethylene / propylene rubber, as found in the aviation industry, which Dow Corning Co. uses under the name, have been subjected to these tests. 02-1062 is distributed.

c) The temperature of the bubble formation was determined 50E 555 - A commercially available ethylene propylene glycol ether after the hydraulic fluids were first available from Dow Chemical Company and subjected to a moisture test which had a molecular weight of approximately 243 in essence. It is assumed that it is the same as that described in the FMVSS 116 specification that the terminal ether alkyl groups are mainly composed of, but there is no comparison liquid consisting of methyl groups, a portion of which was converted from ethyl groups. In the event that the hydraulic fluids 55 are built up.

Contained a base material based on glycol ether, the A 79 nitrile rubber - A commercially available nitrile rubber, such as the temperatures of vapor formation using the Markey he is used in Girling brake systems.

629250

8th

Table 1

Example tested silane derivative

% Silane derivative

Rubber swelling SAE SBR

Viscosity in cSt with vapor bubble formation

No.

in MTG

Bowl 70 hours ax 20 ° C

-40 ° C

temperature (Markey

(% Magnification)

vapor lock) in ° C

4th

T ris- (butylmonoglycol) -3-butyl-

15 *

20.3

371.2

140.5

monoglycol-propyl-silane

(slightly cloudy)

5

Tris (DPMX3-DPM-propyl) silane

40

13.2

502.7

141

6

Bis- (MTG) - (3-MTG-propyl) methylsilane 30

6.8

621

152.5

7

MTG dimethyl (MTG methyl) silane

20th

10.9

252.7

147

8th

Tris (MTGM3-MTG-propyl) silane

80

4.2

1360

187

9

Tris (MTGH3-MTG-propyl) silane

50

5.8

718

158

10th

Tris (MTGH3-MTG-propyl> silane

5

12.4

150

11

Tris (MDG) - (3-MDG-propyl) silane

99

13.6

790

208.5

12th

Tris (M DGH3-MDG-propyl) silane

60

8.2

462

179

* This silane derivative is not soluble in MTG and was therefore dissolved in ETG.

Table 2

Example tested silane derivative

Base oil

% Silane derivative

Rubber swelling

Vapor bubble bil

No.

in the base oil

A79 nitrile rubber,

70 hours at 120 ° C viscosity at manure temperature (Gilpin vapor

(% Magnification)

-40 ° C in cSt lock temp) in ° C

13

Tris- (butylmonolgycol) -

3-butyl-monoglycolpropyl

silane

Mineral Oil A

20th

16.0

130

190

14

T ris- (butyl-monogly col>

3-butyl-monoglycolpropyl

silane

Réfrigérant Oil B

1

"2.0

280

15

Tris (DPMH3DPM propyl) silane

Tributyl phosphates

20th

15.25 *

519.5

126

16

Tris (tridecanoxyH3-tridecanoxypropyl) silane

Mineral Oil A

20th

11.14

343

226

17th

Tris (tridecanoxyH3-tridecanoxypropyl) silane

Mineral Oil A

60

12.4

3930

213

18th

Tris (DPMM3-DPM-2-methylpropyl) silane

Réfrigérant Oil C

1

8.8

280

19th

Tris (DPMM3-DPM-2-methylpropyl) silane

Mineral OilD

15

3.7

20th

Tris (DPMH3-DPM-2-methylpropyl silane

Mineral Oil A

15

12.1

215

21st

Tris- (2-ethylhexanoxy) -

3- (2-ethylhexanoxy)

propyl silane

Silicone fluid

20th

324

232

* This test was performed using the ethylene / propylene / rubber ring seals used in aircraft construction.

9

Table 3

629250

Example test liquid hydrolytic resistance

No.

22

Bis- (E555) dimethyl silane -10%

Clear, agile, no

■

Tris (MDGX3-MDG-propyl) silane -

90%

sediment

23

Tris (DPM) methyl silane - 40%

Tris (DPMX3-DPM-propyl) siIan

-60%

Flexible, not starry, certain deposits that are probably due to contamination of the product, otherwise satisfactory

24th

Tris- (DPM> methyl-silane -10% T ris- (2-ethylhexanoxy) -3- (2-ethylhexanoxy) propyl silane - 90%

No separation, slightly cloudy, no gel formation

25th

Bis- (E555) -dimethyl silane - 25% tris (MDGX3-DMG propyl) silane -T triethylene glycol monoethyl ether -

15% • 60%

Satisfying

26

Bis- (E555) -dimethyl-silane - 20% tris (MDGX3-MDG-propyl) silane-triethylene-glycol-monoethyl ether - 60%

20%

Satisfying

Claims (20)

629 250 PATENT CLAIMS 1. Hydraulic fluid, characterized in that it contains at least one silane derivative which has the general formula I in which a) R is a grouping of the formula R4- (OR5) m-OR6-, b) R 1 and R 2 independently of one another denote alkyl groups, alkenyl groups, aryl groups, alkaryl groups or aralkyl groups, or a group of the formula -OR3, or a grouping of the formula R4- (OR5) m-OR6-, c) R3 is a grouping of the formula R4- (ORs) m- or a grouping of the formula R8 - Si - (OR5) m - Ij, where all radicals R3 can be identical or different from any other apparent radicals R3, d) R4 is an alkyl, alkenyl, aryl, alkaryl or aralkyl radical, and each of the radicals R4 can have the same meaning or the radicals R4 can have different meanings from all other radicals R4, e) R5 is an alkylene group and each of the radicals R5 can have the same meaning or the radical R5 can have a different meaning than all other radicals R5, f) R6 is an alkylene group, where each radical R6 can have the same meaning or the radicals R6 can each have a different meaning, g) m is zero or an integer, where each residue m can have the same meaning or the residues m can have different meanings, h) each of the radicals R7 and R8 independently of one another denotes alkyl, alkenyl, aryl, alkaryl or aralkyl groups or a group of the formula -OR9 or a grouping of the formula R4- (OR5) m-OR6- and i) R9 is a Grouping of the formula R4- (OR5) m-, where the radicals R9 are the same as or different from one another, and also contains at least one further component. 2. Hydraulic fluid according to claim 1, characterized in that in the silane derivative contained therein of formula IR9 is a grouping of formula R4- (OR5) m -, each of the radicals R9 having the same meaning or a different meaning than any other group R9 can have. 2. Compound according to claim 1, characterized in that a) R is a grouping of the formula R4- (OR5) m-OR6-, b) each of the radicals R1 and R2 independently of one another alkyl groups with 1-18 carbon atoms, alkenyl groups with 2-18 carbon atoms, phenyl radicals, alkyl-substituted phenyl radicals in which the alkyl substituent has 1-12 carbon atoms, benzyl radicals or a group of the formula -OR3 or is a grouping of the formula R4- (OR5) m-OR6-, c) R3 is a grouping of the formula R4- (OR5) m- or a grouping of the formula o I s R - Si - (OR) m " where the groups R3 each have the same meaning or a different meaning than any other group R3, d) R4 is an alkyl group with 1-18 carbon atoms, an alkenyl group with 2-18 carbon atoms, a phenyl radical, an alkyl-substituted phenyl radical in which the alkyl substituent has 1-12 carbon atoms, or a benzyl radical, each of the radicals R4 having the same meaning or the radicals R4 can have a different meaning from one another, e) R5 represents an alkylene group with 1-15 carbon atoms, and each of the radicals Rs can have the same meaning or a different meaning than any other radicals R5, f) R6 is an alkylene group with 1-15 carbon atoms, and each of the radicals R6 can have the same meaning or can have a different meaning than all other radicals R6, g) m is zero or an integer from 1 to 4, and each of the symbols m can have the same meaning or a different meaning than any other symbol m, h) each of the radicals R7 and R8 independently of one another is an alkyl group with 1-18 carbon atoms, an alkenyl radical with 2-18 carbon atoms, a phenyl radical, an alkyl-substituted phenyl radical in which the alkyl substituent has 1-12 carbon atoms, or a benzyl radical or one Grouping of the formula -OR9 or a grouping of the formula R4- (OR5) m-OR6- and i) R9 is a grouping of the formula R4- (OR5) m- and each of the radicals R9 has the same meaning or a different meaning than each other R9 may have. 3. Hydraulic liquid according to claim 1 or 2, characterized in that each of the radicals R1 and R2 in the silane derivative contained therein means a methyl group. 4. Hydraulic fluid according to one of claims 1 to 3, characterized in that in the silane derivative contained therein the radical R5 is an alkylene radical which has 1 to 4 carbon atoms, of which radicals the ethylene radical and the propylene radical are preferred. 5. Hydraulic liquid according to one of claims 1 to 4, characterized in that in the silane derivative contained therein the radical R6 is an alkylene radical with 1 to 6 carbon atoms. 6. Hydraulic fluid according to one of claims 1 to 5, characterized in that in the silane derivative contained therein each of the radicals R7 and R8 is a methyl radical. 7. Hydraulic liquid according to one of claims 1 to 6, characterized in that the silane derivative contained therein has a maximum of 2 silicon atoms per molecule. 8. Hydraulic liquid according to one of claims 1 to 7, characterized in that it contains the tris (tri-ethylene glycol monomethyl ether) -3-triethylene glycol mono-methyl ether propyl silane. 9. Hydraulic fluid according to one of claims 1 to 7, characterized in that it the Tris- (di- 2nd 5 10th 15 20th 25th 30th 35 40 45 50 55 Ì0 65 ■ 3,629,250 äthylenglycolmonomethyläther) -3-diethyIenglycolmonomethyl- which contains the alkyl substituents 1 to 12 carbon atoms on ether-propylsilane. have, or an aralkyl radical, preferably a benzyl radical, or 10. Hydraulic fluid according to one of the patents is a grouping of the formula R4- (OR5) m-, languages 1 to 7, characterized in that it contains the tris (tri-R13 an alkyl group, preferably an alkyl group with decanoxy> 3-tridecanoxypropyl-silane. 5 1 -18 carbon atoms, an aryl group, preferably one 11. Hydraulic liquid according to one of the patent phenyl group, an alkaryl group, preferably an alkylsub-claims 1 to 7, characterized in that it contains the tris (ethy- substituted phenyl radical in which the alkyl substituent 1-12 glycol monobutyl ether) -3-ethylene glycol monobutyl ether - Has carbon atoms, or contains an aralkyl group preferential pylsilane. a benzyl radical, or a grouping of the formula 12. Hydraulic fluid according to one of the patent to R4- (OR5) m-0- Proverbs 1 to 7, characterized in that it means the tris and where R4 and R5 and m are those specified in the formula I (Dipropylene glycol monomethyl ether) -3-dipropylene glycol mono have meaning, and contains a glycol ether as methyl ether propyl silane. Basic material is. 13. Hydraulic liquid according to one of claims 1 to 7, characterized in that it contains the bis (tri-15 äthylenglycolmonomethyläther) -3-triäthylenglycolmono-methylätherpropyl-methyl-silan. 14. Hydraulic liquid according to one of claims 1 to 7, characterized in that it The present invention relates to a hydraulic fluid triethylene glycol monomethyl ether-dimethyl triethylene glycol 20-containing silane derivatives. Which contains in the erfindungsge-Monomethyläthermethyl-silan. silane derivatives used in hydraulic fluids 15. Hydraulic fluid according to one of the patentants are generally new silane derivatives. Claims 1 to 7 according to the invention, characterized in that they contain the tris (2-s hydraulic liquids do not cause damage to ethylhexanoxy) -3- (2-ethylenehexanoxy) propyl silane. of synthetic or natural rubber 16. Hydraulic fluid according to one of the patent components, if they are with them for a long time in Proverbs 1 to 7, characterized in that they are in contact with the Tris. (DipropylengIycoImonomethyläther) -3-dipropylenglycolmono- Hydraulic liquids based on glycol ethers contains methyl ether 2-methyl propyl silane. have been used in various systems, for example 17. Hydraulic fluid according to one of the patent in brake devices of vehicles and in clutch sy claims 1 to 16, characterized in that they stem from 0.5 to 99 30. The glycol ethers have been used for many years by weight, based on the total weight of the hydraulic purpose, and they still remained on the skin liquid, containing silane derivatives of the formula I. most used type for the stated purposes. But 18. Hydraulic fluid according to one of the patent claims, over time the requirements imposed on claims 1 to 17, characterized in that they contain at least shafts with respect to the required quality standards such an additive for a hydraulic fluid or a 35 g fluids are ever stricter, namely that they contain basic material for a hydraulic fluid. which these requirements are met both by the manufacturers 19. Hydraulic fluid according to one of the patent systems and also from interest groups, such as Proverbs 1 to 17, characterized in that they essentially contain, for example, the society of automotive engineers, a mixture of at least 5-30% by weight of a silane i (Society of Automotive Engineers) and the US Department of derivatives of the formula I and 5-30% by weight of a compound of 40 (for transportation (US Department of Transportation). In the following general formulas II or III or IV I especially there is the possibility to develop liquids Icons that have higher boiling points and, what is even more important, higher temperatures for the vapor bubble OR R own, both for the form- I I 45 gated liquid as well as for the liquid when used in r - si - OR R - fi - OR water is used. It is known that rivers In this regard, glycol ether-based liquids I - ^ 2! 12 have bad properties because of the hygroscopic OR OR copious properties of these fluids that cause 50 that water is absorbed from the atmosphere. This (II) (III) absorption of the water again lowers the boiling point and also the temperature at which vapor bubbles form in the liquid and with prolonged use the water content of the liquid can increase to such a degree that OR OR 55 at which the boiling point and the temperature for the steam I formation until reaching a dangerous level R -Si-O-Si-R (iy \. If such liquids are exposed to heat «Are thrown away, for example, the heat from you 1- ^ 2 drastic braking is caused, then the R R 60 boil liquid or form vapor bubbles to such an extent that this seriously impairs the function of the brake in these formulas. R11, an alkyl group, preferably an alkyl group with 1-18 carbon hydraulic fluids, based on glycol esters which are len atoms, or an aryl group, preferably a phenyl group, which are only slightly hygroscopic, have been developed to eliminate the problems shown in FIG. 65. Such liquids are R12 is an alkyl radical, preferably an alkyl radical having 1-18 carbon atoms, an aryl radical, preferably a phenyl radical, a relatively insensitive to the influence of atmospheric moisture, but they are considerably more expensive, the fluke alkaryl radical, preferably an alkyl-substituted phenyl radical, in liquids based on glycol ethers and they also have 629250 certain technical disadvantages. For example, their viscosity properties are worse than those of liquids based on glycol ethers. Accordingly, the use of these liquids, which have little hygroscopic properties, has been mainly restricted to those fields of application in which the desirable properties, such as a high boiling point and high vapor bubble temperatures, of these liquids have been considered important enough to compensate for the disadvantageous properties of these liquids . Other types of water insensitive liquids have also been developed. Nevertheless, manufacturers are still looking for new liquids that combine as many of the desirable properties of the hydraulic liquids based on glycol ethers as those of liquids with low hygroscopic properties and, desirably, these liquids should even have higher boiling points and / or temperatures at which vapor bubbles occur than the liquids with low hygroscopic properties. Recently, there has been a growing tendency in the development of new vehicle models to develop a single hydraulic system for operating the car in such devices as power steering systems, shock absorbers and brakes. So far, these individual devices have been equipped with separate hydraulic systems. This led to drastic problems when formulating suitable liquids. The mineral oil-based fluids that have been used in power steering systems and shock absorbers have satisfactory properties over nitrile rubbers and chloroprene rubbers, for sealing and as sealing rings, in such properties against nitrile rubbers and chloroprene rubbers, which have been used for sealing and as sealing rings in such systems , but the materials mentioned have very deleterious properties over natural rubber and styrene-butadiene rubbers, which are used in the construction of hydraulic brakes and clutch systems. The liquids cause the seals of the last-mentioned systems to swell too much, and this can cause the brakes and clutch systems to function poorly. On the other hand, those fluids which have been used in hydraulic brakes and clutch systems and which are normally fluids based on glycols, glycol ethers and / or glycol ether esters and which have worked satisfactorily in these systems have a deleterious influence on the seals made of nitrile rubber and chloroprene rubber used in power steering systems and shock absorbers and they can also cause poor functioning in such systems. Although it is very important in all mechanical devices to be reliable when used, however, when it comes to motor vehicles, this reliability is of even more crucial importance and, based on safety considerations, it is regarded as an absolutely essential requirement. For this reason, the need has arisen for a liquid which can be used satisfactorily in a central system which can be used to control the operation of a number of different units of the device, for example a motor vehicle. It has now surprisingly been found that new silicon compounds which are suitable as a component in hydraulic fluids which can be used in hydraulic brake systems and hydraulic clutch systems are also suitable as components for hydraulic fluids in central hydraulic systems. These compounds exhibit improved rubber swelling properties, namely a variety of natural rubbers and synthetic rubbers used in the construction of hydraulic systems, and the liquids mentioned are also quite insensitive to water.