DE2140465A1 - Hydraulic fluid mixture - Google Patents

Description

REAL ACQUISITION

DR. JUR. DäPL-CHEM. WALTER BEIL ALFREDHOEPPENER Aug 11, 1971

DR, JUR. DIPL-CHEM. H.-J. WOLFP DR. JUR. HANS CHR. AX

«23 FiANKFUBTAM AAAiN-HQCHSf

AMONBRAiSiN

Our no.17.255

Stauffer Chemical Company New York, Ν.Ϊ., V.St.A.

Hydraulic fluid mixture .

The present invention relates to a hydraulic fluid mixture for transmitting pressure in one hydraulic system consisting of a mixture of a styrenated triaryl phosphate and an alkylphenyl phenyl phosphate.

Functional fluids, hydraulic for working mechanisms are likely require a combination of properties that related materials joining in many of Ver are often impossible to achieve. One of the properties that are required for safe and satisfactory operation at low temperatures is a low sliding point, which enables the hydraulic fluid to operate at low temperatures. Functional fluids should also have a low sensitivity to oxidation ',

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so that they work without sludge formation. Another important property of such liquids is a flat viscosity-temperature curve, that is, a high viscosity index, which makes the liquid unusable over a wide temperature range remain. One of the most important properties required of liquids, which is either in the Industry or in. Mining or used for military purposes is the lowest possible fire hazard. Other desirable properties for such products include a proportionately high boiling point as well as the properties of a low Corrosion.

Heretofore, mixtures of various phosphates have been used for use as functional fluids. Triaryl and trialkyl phosphates were used as such or in Used in combination with one another to achieve functional fluids with a variety of properties. However, the liquids known to date lack one or more of the aforementioned inherent shafts.

One object of the present invention is functional fluids * which have all of the properties described above exhibit.

Another object of the present invention is one made on an entirely synthetic basis functional fluid that consists of two components, which, if in varying proportions

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are combined to give a number of liquids of varying viscosity, depending on the proportions each of these liquids compared to known ones Flow:! properties with similar viscosity are superior Has properties.

It has now been found that these goals can be enough to have a functional liquid composition used, which consist of a. styrenated triaryl phosphate and an alkylphenyl phosphate be available.

The functional fluid composition according to the invention are fluids on a fully synthetic basis, which eu about 10 to about 90 GeY /. -%, based on the total composition, of a styrenated triaryl phosphate and about 90 to about 10 wt. These fluids can also contain small amounts of various additives such as antioxidants, host inhibitors, defoamers and pressure bearing additives.

The styrenated triaryl phosphates used in the present invention have the following general neir.e Foraol:

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BAD ORKSlNAt

3-x

in which χ is a number around 0, i? up to about 2, preferably about 0.7 to about 1.5 inclusive, η means a Numbers from 1 to 3 inclusive and a and c are numbers from 0 to 5 inclusive, b is a number of O

up to 4 inclusive and R-,

as well as R, each an alkyl

flu with 1 to about 8 carbon atoms.

The compounds are characterized by a high viscosity, that is, the viscosities are above Saybolt Universal seconds at 38 ⁰ G. The value of χ is equal to the average number of Styrylphenylgruppen per phosphate group. It therefore describes a mixture of phosphates instead of a pure compound. If, for example, the styryl triphenyl phosphate used is a styryl phosphate with a value for χ of 1.5 and for η of 1, it consists of a mixture of styrylphenyldiphenyl phosphate, tistyrylphenylphenyl phosphate, triphenyl phosphate and various other isomers; the mixture has an average value of 1.5 styrylphenyl groups per phosphate group. Examples of styrylphenyl compounds which are preferred in the present invention are: styrylplienyldiphenylphosphate, styrylphenyldicresyl phosphate, styryl pherjyldixylyl phosphate, styrylphenyl bis (isopropylphenyl) phosphate, styryl -

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2140495

phenyl bis (butylphenyl) phosphate, isopropylbenzylphenyldiphenyiphosphate, and a mixture of the above compounds with 3is (styrylphenyl) phenyl phosphate, bis (styrylphenyl) cresyl phosphate, bis (styrylphenyl) xyIyI phosphate and the like.

Styryl phenyl diphenyl phosphate and styryl phenyl bis (isopropyl phenyl) phosphate with a value for χ from 0.7 to 1.5 and a value for η of 1 are given particularly before. The compounds according to the invention also include: Distyrylphenyldiphenyl phosphate, Distyryiphenyl bis (isopropylphenyl) phosphate, Tristyrylphenyldiphenylphosphat, Bis- (distyryiphenyl) -phenylphosphat, Distyryiphenyldicresylphosphat, Distyryiphenyldixylenylphosphate and mixtures thereof.

The compounds mentioned above are for illustrative purposes only and are not intended to be an exhaustive list mean.

The alkyl phenyl phosphates used in the present invention have the following general formula:

3-y

in the 12th an alkyl group with 3 to about 12 carbon atoms, d is a number from 1 to 5 inclusive and y

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2H0465

is a number from about 0.2 to about 2.5.

Like χ, y © denotes an average value for a mixture of phosphates. These compounds are well known in the art and are characterized by relatively low viscosities compared to the styrenated triaryl phosphates. Normally their viscosity values are below 200 % a $ oölt Universal Seconds at 38 C. Examples of these compounds are listed below: Isopropylphenyl diphenyl phosphate, bis-isopropylphenyl phosphate, diisopropylphenyldiphenylphosphate, tert-butylphenyldiphenylphosphate, diphenylphosphate, hexylphenyldiphenylphosphate, hexylphenyldiphenylphosphate, sgc. the same. Isopropylphenyldiphenyl phosphate and the butylphenyldiphenyl phosphates are preferred.

The styrenated triaryl phosphates and alkyl phenyl phosphate-s are mixed in denominations of about 10 to about 90% by weight , based on the total mixture of the styrenated iriaryl phosphate and about 90 to about 10 % alkyl phenyl phosphate. This mixing is done according to one of the known methods for mixing liquids. The viscosity of the mixture varies over a wide range, depending on the particular phosphates used and the proportions in which they are mixed. As a result, by varying the relative proportions of the two phosphates used, a series of liquids with different viscosities can be obtained from only two components. Typically, these liquids will have viscosities in the range of from about 100 to about 900 Saybolt Universal seconds, and preferably from about 220 to about t> 00 Saybolt Universal seconds

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bath

at 38 ⁰ C.

The liquids according to the invention are by a exceptionally high resistance to oxidation, low pouring points, high auto-ignition temperatures and behaves moderately high viscosity indices compared to the previously known liquids. Furthermore, the liquids according to the invention have excellent properties Flan resistance and hydrolytic resistance.

The liquids according to the invention can also contain small amounts of other additives that are used in the art are well known. The liquids according to the invention have an excellent oxidation resistance on calibration, , -but this property can be improved by adding any commonly used antioxidant, such as an arylamine, alkylphenol, liaphthylamine and alkylphenylamino will.

The naphthylamines, such as phenyl- oL-naphthylaniin and Oc cylphenyl- ot-naphthylamine, as well as the Alkylphenylair.ine, such as dioctyldiphenylaniin, are particularly beneficial antioxidants for the invention moderate liquids. These antioxidants are normally used in amounts from about 0.1 to about 2% % By weight mixed. Furthermore, rust inhibitors, such as polyhydric alcohols, alkylraalonic and succinic acids, Amines, aminophenols and the polyvalent metal salts of organosulfonic acids in the invention Liquids are incorporated. This anti-rust agent are also used in small proportions, i.e. between about 0.1 and about 2 parts by weight.

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BATH

Foam inhibitors can also be added to the liquids be incorporated.

The functional fluids according to the invention develop their effect in closed hydraulic fluids Systems such as compressors, hydraulic

Aircraft lifts in aircraft carriers, Elevators, lifting platforms, braking systems, basic oxygen ovens, Injection molding equipment, leveling devices, or servo control units, in such a way that when applying pressure to the fluid at a specific point within the confines of the hydraulic System to transfer the pressure through the fluid to every other point within the hydraulic system will.

The invention is further illustrated by the following examples.

Example 1;

Styrylphenyl bis (isopropylphenyl) phosphate was synthesized by reacting a commercially available styrenated phenol with phosphorus oxychloride in the presence of magnesium chloride and then reacting the product thus obtained with a commercially available isopropylated phenol. The product contained on average about 0.7 Styrylphenylgruppen per molecule and had a viscosity of 1,009 Saybolt Universal seconds at 38 ⁰ C. This styrenated phenyl-bis- (isopropylphenyl) phosphate was mixed with the Isopropylphenyldiphenylphosphat in a ratio of about 42 to 58% $ based on the weight of the total composition.

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The liquid was as listed in Table I below Properties.

Table I:

Viscosity (Sayboit Universal seconds)

at 38 ⁰ C 21?

at 99 ° C 43.9

Viscosity are 2.2

Pour point ( ⁰ C) '-29

Acidity (rag KOil / g) 0.14

Serbstent ignition temperature (C) 5 & 5

Flash point ( ⁰ C) 243

Focus ( ⁰ C) 335 ■

Ignition in the hot pipe system (drops) 804 Temp. ( ⁰ C)

Shell-4 Ku / rel test (54 ° C, 600 rpm)

10 kg 0.30

40 kg 0.50

Example 2:

Styryl phenyl diphenyl phosphate was synthesized by reacting a commercially available styrenated phenol with phosphorus oxychloride in the presence of magnesium chloride and subsequent reaction of the product thus obtained with phenol. The product contained slightly more than one styrylphenyl group on average

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- OK -

per molecule and had a viscosity of 1,033 Saybolt Universal seconds at 38 ⁰ C. This was styrylphenyl diphenyl phosphate, mixed with Isopropylphenyldiphenylpnosphat in a ratio of about 42 to 58%, based on dae weight of the total composition. The liquid had the properties given in Table II:

Table II: 219 Viscosity (Saybolt Universal seconds) 44 at. 38 ⁰ C 28 at 99 ° C 0.04 Viscosity index 604 Acidity (mg KQH / g) 135 Auto-ignition; temperature (C) 343 Flash point ( ⁰ C) Focus (C)

Similar tests were carried out on a liquid commercially available and sold under the trade name "Fyrquel 220" by Stauffer Chemical Company, New York. "Fyrquel 220" is a liquid at Triarylphosphatbasis mit.einer viscosity of about 220 Saybolt Universal seconds at 38 ⁰ C. The Flanmeigenschaften for Styrylphenyldiphenylphosphat liquid and "Fyrquel 220" were about the same, however, had a Styrylphenyldiphenylphosphat, considerably higher Viscosity index and was therefore usable within a wider range of applications than was the case with the commercially available liquid.

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Example 3i

The fluid used in Example 2 was made into a liquid using the method described in ASTM-D2271 Vickers impeller pump tested. A total volume of 36 liters was used and the temperature was at 66 C held under a pressure of 140.6 kg / cm. The results are given in Table III.

Table IHg

Total Weight Loss (g) des

Impeller acid number viscosity (S.U.Sec.) (Mg KOH / g)

Time Rings (Hours.) π 0.0141 \ j
24 0.0166 4δ 0.0l8b 161 237 495 800 1000 0.0193 0.0197

0.002b
0.00 ** 2

0.0049
0.0052
0.0053

From Table III it can be seen that the invention Liquids maintain their viscosity and acidity properties within tight tolerances over long periods of time continuous use, while the corrosion effect on the material is very low is.

219 0.04 210 0.07 213 0.06 214 0.10 213 0.1b 216 0.34 216 0.55 216 0.63

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Example 4:

A number of liquids were obtained by varying the proportions of styrylphenylphosphate and isopropylphenyldiphenylphosphate, used in Example 2. The respective proportions are in Table IV listed.

Table IV: viscosity
at 38 C SU
Sec.) Styrylphenyl
diphenylpho sphat
(Weight-JS) Isopropylphenyl
diphenyl phosphate 121 IO 90 133 15th 85 148 22nd 78 219 42 58 491 75 25th 546 80 20th

All of the blends listed in Table IV have relatively low acidity, high viscosity and comparable flame properties in view of customary Liquids with comparable viscosities.

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Claims (1)

Claims; 1. Synthetic hydraulic fluid mixture consisting of: a) about 10 to about 90 Gaw .- # of the total mixture of a styrenated triaryl phosphate of the general formula: 0 egg 3-x in which χ is a number from about 0.5 to about ^l 2.0 inclusive, η is a number from 1 to 3 inclusive and a and c are numbers from O to about 5s b a number from 0 to 4 inclusive, and B ,, R ₂ and R, each represent an alkyl group having 1 to 8 carbon atoms, and b) about 90 to about 10 wt -.% of Gesamtg® misefos a Älkylphenylphosphats the general formal? Il wherein R, is an alkyl group having 3 to about 12 carbon atoms, d is a number from 1 to 5 inclusive, and Y is a number from about 0.2 to about 2 _S 5 inclusive, the mixture having a viscosity which is in the range of about 100 to about 900 Saybolt Universal seconds at 38 ⁰ C. 2. Mixture according to claim I _1, characterized in that η is 1 and χ is a number from about 0.7 to about 1.5. 3. Mixture according to claim I _5, characterized in that the styrenated triaryl phosphate is styrylphenyldiphenyl phosphate. 4. Mixture according to claim l _s characterized in that the styrenated triaryl phosphate is styrylphenyl bis (isopropylphenyl) phosphate «, 5e 25usaimaens @ tzuKg 'n'aeh claim 4 "characterized ₉ that the"iiyIpko-3p'iat isopropyl phenyldiphenium phosphate. 2U0465 6. Composition according to claim I ₉ , characterized in that the alkylphenyl phosphate is tert-butylphenyldiphenyl phosphate or sec-butylphenyldiphenyl phosphate. For: Stauffer Chemical Company Lawyer