WO2016096074A2

WO2016096074A2 - High-temperature lubricants

Info

Publication number: WO2016096074A2
Application number: PCT/EP2015/002322
Authority: WO
Inventors: Karl EGERSDÖRFER; Thomas Kilthau; Stefan Grundei; Stefan Seemeyer
Original assignee: Klüber Lubrication München Se & Co. Kg
Priority date: 2014-12-17
Filing date: 2015-11-19
Publication date: 2016-06-23
Also published as: KR20170085089A; PL3372660T3; BR112017012528A2; EP3372660B1; HUE057256T2; CN107406791B; MX2021012796A; EP3372659A1; DK3372660T3; JP2017538838A; ES2893843T3; EP3372659B1; EP3234079A2; EP3234079B1; US20170327760A1; CN107406791A; WO2016096074A3; MX2017007674A; DE102014018718A1; EP3372660A1

Abstract

The invention relates to a food-compatible high-temperature lubricant, in particular a high-temperature oil and a high-temperature grease, comprising the following components: a) at least one oil selected from a trimellitic acid ester or a mixture of various trimellitic acid esters, alkyl aromates, preferably an aliphatically substituted naphthalene or estolide; b) a hydrogenated or fully hydrogenated polyisobutylene or a mixture of hydrogenated or fully hydrogenated polyisobutylene and; c) additives, individually or in combination. In the case of the high-temperature grease, a thickening agent is added.

Description

High temperature lubricants

description

The invention relates to high temperature lubricants, especially oils and fats based on an aromatic ester, such as a trimellitic acid ester and mixtures of various trimellitic acid esters, alkylaromatics, estolides and a fully hydrogenated or hydrogenated polyisobutylene or a mixture thereof, a thickener. The invention further relates to the use of this high temperature grease for continuous use temperatures of up to 250 ° C.

In addition to the lubricating effect, the lubricants must fulfill a variety of other tasks: they must cool, reduce friction, wear and power transmission, protect against corrosion and at the same time have a sealing effect. In addition, the high temperature greases should be quiet.

Conventional lubricants are not suitable for high temperature applications because they are destroyed at high temperatures, for example by oxidation and / or thermal decomposition reactions and polymerizations and their lubricating properties are severely limited. In decomposition reactions, the lubricant is split into low molecular weight volatile components. Their evaporation leads to undesirable viscosity changes, oil loss and excessive vapor formation. This results in a loss of lubricity. Even through polymerization lose the Lubricants reduce their lubricating effect due to the formation of insoluble polymerization products.

The removal of these contaminants increases the maintenance work and produces chemical waste, which must be disposed of consuming. Due to the increased cleaning and maintenance work, the downtime increases. Overall, the use of unsuitable lubricants in high-temperature applications leads to higher costs, as the tools pollute and there is a greater need for lubricants. In addition, the product quality decreases.

Synthetic esters are often used as base oils for high-temperature applications since they have very good oxidative, hydrolytic and thermal stability.

In order to meet the diverse requirements of high-temperature applications, the lubricants must have, among other things, high stability, low friction coefficients and high wear resistance. In order to ensure uniform lubrication even at high temperatures, a liquid lubricant film must remain between metal parts during the entire processing process. Therefore, the lubricant must evaporate only slightly at the maximum processing temperature, form little residue and form as few cracking residues as possible. High temperatures often occur when used in chains, rolling and plain bearings, in vehicle technology, materials handling, mechanical engineering, office technology and in industrial equipment and machinery, but also in the fields of home appliances and consumer electronics. In rolling and plain bearings, lubricants ensure that a separating, load-transmitting lubricating film is built up between sliding or rolling parts. This ensures that the metallic surfaces do not touch and thus no wear occurs. The lubricants must therefore meet high requirements. These include extreme Operating conditions such as very high or very low speeds, high temperatures due to high speeds or foreign heating, very low temperatures, for example, in camps that operate in cold environments or that occur in aerospace applications. Likewise, the modern lubricants under so-called clean room conditions should be used to avoid the pollution of the room by the abrasion or the consumption of lubricants. In addition, when using the modern lubricants should be avoided that they evaporate and thus "leach", ie that they become solid after a short time application and no longer show any lubricating effect. On lubricants special requirements are placed in the application to the effect that the running surfaces of the bearings are not attacked by low friction, run the storage areas quiet, and long running times are achieved without relubrication required. Also, lubricants must withstand the effects of force such as centrifugal force, gravity and vibration.

An important parameter for a long service life of a grease-lubricated roller bearing in the high-temperature range is, in addition to the upper service temperature, the noise behavior of the lubricant. A lubricating grease can stimulate vibrations in the rolling bearing during circulation participation (rolling over, rolling), which are "lubricant noises" in the frequency bands medium 300 to 1,800 Hz and high 1,800 to 10,000 Hz, compared to the bearing noise in the frequency band low at 50 to 300 Hz. The lubricant noise is superimposed by the noise peaks that occur during the rolling over of hard particles by the rolling elements in the form of shock pulses on the bearing ring. The noise behavior is evaluated according to the SKF BeQuiet ⁺ method. The fat noise class is classified as follows:

GNX: slightly worse than GN1 (very bad noise behavior)

GN1:> 95% of all peaks are <= 40 pm / s (poor noise behavior)

GN2:> 95% of all peaks are <= 20 pm / s; > 98% of all peaks are <= 40 pm / s (average noise behavior)

GN3:> 95% of all peaks are <= 10 pm / s; > 98% of all peaks are <= 20 pm / s;

> 100% of all peaks are <= 40 pm / s (good noise behavior) GN4:> 95% of all peaks are <= 5 μηι / s; > 98% of all peaks are <= .10 pm / s; > 100% of all peaks are <= 20 μιη / s (very good noise behavior)

The better the noise behavior of a grease, the lower the vibrations of the bearing forced by the lubricant. This is equivalent to a low load on the bearing and leads to a longer service life of storage.

The object of the present invention is to provide a high temperature oil and high temperature grease which meets the above requirements. In particular, the lubricating oil or grease at high temperature over a long period of time to show a good lubricating effect. Furthermore, the Vercrackungsrückstände formed should not lend, but be redissolvable by fresh fat. Furthermore, the high-temperature lubricant should have a good hydrolytic stability, corrosion and wear resistant, as well as have a good oxidation resistance and adapted to the requirement good low temperature behavior. This is defined by the pour point for lubricating oils and by the flow pressure at low temperatures for lubricating greases. In addition, the high-temperature grease should show good noise behavior, have long maturities and cause substantially no signs of wear of the devices.

This object is achieved by a high-temperature oil comprising the following components: a) 93.9 to 45 wt .-% of at least one oil selected from the group consisting of alkylaromatics, preferably an aliphatic substituted naphthalene, estolides, trimellitic esters, or a mixture of different Trimellitic esters in which the alcohol group of the ester is a linear or branched alkyl group having 8 to 16 carbon atoms,

b) 6 to 45 wt .-% of a polymer, namely a hydrogenated or fully hydrogenated polyisobutylene or a mixture of hydrogenated or fully hydrogenated polyisobutylene;

c) 0.1 to 10 wt .-% of additives individually or in combination, selected from the group consisting of anti-corrosion additives, antioxidants, anti-wear additives, UV stabilizers, inorganic or organic solid lubricants. This object is achieved by a high-temperature fat comprising the following components: a) 91, 9 to 25 wt .-% of at least one oil selected from the group consisting of alkylaromatics, preferably an aliphatic substituted naphthalene, estolides, trimellitic esters, or a mixture of different Trimellitic acid esters in which the alcohol group of the ester is a linear or branched alkyl group having 8 to 16 carbon atoms,

b) 6 to 45% by weight of a polymer, namely a hydrogenated or fully hydrogenated polyisobutylene or a mixture of hydrogenated or fully hydrogenated polyisobutylene;

c) 0.1 to 10 wt .-% of additives individually or in combination, selected from the group consisting of corrosion protection additives, antioxidants, anti-wear additives, UV stabilizers, inorganic or organic solid lubricants and

d) 2 to 20 wt .-% thickener.

Surprisingly, it has been found that the high-temperature oil according to the invention and the high-temperature fat according to the invention are distinguished by outstanding performance. Thus, the high-temperature oil or high-temperature grease according to the invention exhibits high thermal stability combined with a long service life and good lubricating properties.

The high-temperature oil according to the invention comprises as ester compound an estolide or a mixture of different estolides or an aliphatically substituted naphthalene or a mixture of different aliphatically substituted naphthalenes.

The preferred viscosities of the estolides, measured at 40 ° C, are between 30 and 500 mm ² / sec. Viscosities of 30 to 140 mm ² / sec are particularly preferred. Estolides are ester compounds which are acid or enzymatically catalyzed from fatty acids, preferably oleic acid or dicarboxylic acids, or a mixture of both. The acid function attacks the double bond of an adjacent oil fatty acid molecule, resulting in a higher molecular weight ester compound. The terminal acid group is then usually esterified with an alcohol, preferably 2-ethyl-hexanol and then the remaining double bonds are hydrogenated or esterified with carboxylic acid, for example acetic acid. Other alcohols such as isoamyl alcohol or Guebert alcohols are also conceivable for the esterification of the terminal acid group.

Other estolides may also be obtained via condensation of hydroxycarboxylic acids or condensation of hydroxycarboxylic acids with fatty acids, e.g. Oleic acid or stearic acid derivatives are synthesized. The chain length of the hydroxycarboxylic acids or unsaturated acids used can range from C6 to C54. The acids may contain other functional groups e.g. Amines, ethers, containing sulfur-containing groups. In addition, an esterification with alpha-olefins or ß-Farnesen is conceivable.

The high temperature oil of the invention may contain a second oil comprising an alkylaromatic. Preferably, an aromatic is used. According to the invention, an aromatic means a monocyclic, bicyclic or tricyclic ring system having four to fifteen carbon atoms, the monocyclic ring system being aromatic or at least one of the rings being aromatic in a bi- or tricylic ring system. Preference is given to using a bicyclic ring system which preferably has 10 carbon atoms.

Preferably, the aromatic is substituted with one or more aliphatic substituents. Particularly preferred is the aromatic having one to four aliphatic substituents and in particular having two or three aliphatic substituents substituted.

An alkyl group according to the invention is a saturated aliphatic hydrocarbon group having 1 to 30, preferably 3 to 20, more preferably 4 to 17 and especially 6 to 15 carbon atoms. An alkyl group may be linear or branched and is optionally substituted with one or more of the abovementioned substituents.

According to the invention, the lubricating oil particularly preferably contains at least one aliphatically substituted naphthalene, in particular at least one alkyl-substituted naphthalene. Preferably, the naphthalene is substituted with one to four aliphatic substituents and in particular with two or three aliphatic substituents. Practical experiments have shown that mixtures of differently substituted naphthalenes, ie mixtures of naphthalenes, which have a different degree of substitution and different aliphatic substituents, are particularly suitable. In this case, by varying the mixture composition, the properties, such as the viscosity, of the high-temperature lubricant can be set particularly easily. Aliphatic-substituted naphthalenes are also characterized by excellent dissolution properties and high thermo-oxidative stability.

The viscosity, measured at 40 ° C, of the aliphatically substituted naphthalene is preferably 30 to 600 mm ² / s, more preferably 30 to 300 m / s.

The high temperature oil of the invention further comprises a polyisobutylene. By suitable choice of the polyisobutylene, in particular with regard to the degree of hydrogenation and molecular weight, the properties of the oil according to the invention, for example its kinematic viscosity and, above all, its formation of residues, can be influenced in a desired manner. The polyisobutylene can be used in hydrogenated or fully hydrogenated form, as well as a mixture of hydrogenated and fully hydrogenated polyisobutylene can be used. Fully hydrogenated polyisobutylenes are preferably used. The Polyisobutylene is present in an amount of 6 to 45 wt .-% in the composition, preferably 10 to 45 wt .-%, in particular 5 to 45 wt .-% are used. The high-temperature oil according to the invention further comprises from 0.1 to 10 wt .-%, additives which are used individually or in combination and from the group consisting of anti-corrosion additives, antioxidants, anti-wear additives, UV stabilizers, inorganic or organic solid lubricants selected.

The high-temperature fat of the present invention comprises as an ester compound a trimellitic acid ester or a mixture of various trimellitic acid esters, wherein the alcoholic group of the ester is a linear or branched alkyl group having 8 to 16 carbon atoms. Depending on the choice of the aromatic ester, the properties of the lubricant, for example, the viscosity, the viscosity-temperature behavior, the oxidation resistance and residue behavior can be adjusted.

The high temperature grease of the invention may contain a second oil comprising an alkyl aromatic. Preferably, an aromatic is used. According to the invention, an aromatic means a monocyclic, bicyclic or tricyclic ring system having four to fifteen carbon atoms, the monocyclic ring system being aromatic or at least one of the rings being aromatic in a bi- or tricylic ring system. Preference is given to using a bicyclic ring system which preferably has 10 carbon atoms.

Preferably, the aromatic is substituted with one or more aliphatic substituents. The aromatic is particularly preferably substituted by one to four aliphatic substituents and in particular by two or three aliphatic substituents.

An alkyl group according to the invention is a saturated aliphatic hydrocarbon group having 1 to 30, preferably 3 to 20, more preferably 4 _g to 17 and especially 6 to 15 carbon atoms. An alkyl group may be linear or branched and is optionally substituted with one or more of the abovementioned substituents. According to the invention, the lubricating grease particularly preferably contains at least one aliphatically substituted naphthalene, in particular at least one alkyl-substituted naphthalene. Preferably, the naphthalene is substituted with one to four aliphatic substituents and in particular with two or three aliphatic substituents.

Practical experiments have shown that mixtures of differently substituted naphthalenes, that is, mixtures of naphthalenes having a different degree of substitution and different aliphatic substituents, are particularly suitable. In this case, by varying the ishing composition, the properties, such as the viscosity, of the high-temperature lubricant can be set particularly easily. Aliphatic-substituted naphthalenes are also characterized by excellent dissolution properties and high thermo-oxidative stability. The viscosity, measured at 40 ° C, of the aliphatically substituted naphthalene is preferably 30 to 600 mm ² / s, more preferably 30 to 300 m ² / s.

Furthermore, estolides can also be used. Preferred viscosities, measured at 40 ° C are between 30 and 500 mm ² / sec. Viscosities of 30 to 140 mm ² / sec are particularly preferred.

The high-temperature grease according to the invention further comprises a polyisobutylene. By suitable choice of the polyisobutylene, in particular with regard to the degree of hydrogenation and molecular weight, the properties of the fat according to the invention, for example its kinematic viscosity, can be influenced in a desired manner. The polyisobutylene can be used in hydrogenated or fully hydrogenated form, as well as a mixture of hydrogenated and fully hydrogenated polyisobutylene can be used. Fully hydrogenated polyisobutylenes are preferably used. The polyisobutylene is in an amount of 6 to 45 wt .-% in the composition, preferably 10 to 45 wt .-%, in particular 15 to 45 wt .-% are used.

According to a further preferred embodiment, the polyisobutylene has a number average molecular weight of 115 to 0.000 g / mol, preferably from 160 to 5000 g / mol.

The high-temperature fat according to the invention further comprises from 0.1 to 10 wt .-%, additives which are used individually or in combination and from the group consisting of anti-corrosion additives, antioxidants, anti-wear additives, UV stabilizers, inorganic or organic solid lubricants selected.

The high-temperature fat according to the invention also comprises a thickener. The thickener in the high-temperature grease of the lubricant composition according to the invention is either a reaction product of a diisocyanate, preferably 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4'-diisocyanatodiphenylmethane, 2,4'-diisocyanatophenylmethane, 4,4'-diisocyanatotoluene. Diisocyanatodiphenyl, 4,4'-diisocyanato-3,3'-dimethylphenyl, 4,4'-diisocyanato-3,3'-dimethylphenylmethane, which may be used singly or in combination, with an amine of general formula R'2 -NR, or a diamine of the general formula R'2-NR-NR'2, where R is an aryl, alkyl or alkylene radical having 2 to 22 carbon atoms and R 'is identically or differently a hydrogen, an alkyl, alkylene or aryl radical, or with mixtures of amines and diamines

or

is selected from among Al complex soaps, metal soaps of the first and second main group elements of the perriodic system, metal complex soaps of elements of the first and second main group of the periodic table, bentonites, sulfonates, silicates, aerosil, polyimides or PTFE or a mixture of the foregoing thickener.

As additives for high-temperature oils and fats, the additives mentioned below have particularly good physical and chemical properties: The addition of antioxidants can reduce or even prevent the oxidation of the oil or fat according to the invention, in particular when it is used. Oxidation can lead to undesirable free radicals and, as a result, decomposition reactions of the high-temperature lubricant can occur. The addition of antioxidants stabilizes the high temperature grease.

Antioxidants which are particularly suitable according to the invention are the following compounds:

Styrenated diphenylamines, diaromatic amines, phenolic resins, thiophenol resins, phosphites, butylated hydroxytoluene, butylated hydroxyanisole, phenyl-alphanaphthylamine, phenyl-beta-naphthylamine, octylated / butylated diphenylamine, di-alpha-tocopherol, di-tert-butyl-phenyl, Benzenepropanoic acid, sulfur-containing phenolic compounds, phenolic compounds and mixtures of these components.

Furthermore, the high temperature grease may contain corrosion inhibiting additives, metal deactivators or ion complexing agents. These include triazoles, imidazolines, N-methylglycine (sarcosine), benzotriazole derivatives, N, N-bis (2-ethylhexyl) -ar-methyl-1 H-benzotriazole-1-methanamine; N-methyl-N (1 -oxo-9-octadecenyl) glycine, mixture of phosphoric acid and mono- and Diisooctylester reacted with (C11-14) - alkylamines, mixture of phosphoric acid and mono- and Diisooctylester reacted with tert-alkylamine and primary (Ci2-14) amines, dodecanoic acid, triphenyl phosphorothionate and amine phosphates. Commercially available additives are the following: IRGAMET ^® 39, IRGACOR ^® DSS G, amine O; Sarkosyl O ^® (Ciba), COBRATEC ^® 122, CUVAN ^® 303, VANLUBE ^® 9123, CI-426, CI-426EP, Cl- 429 and CI-498th

Further anti-wear additives are amines, amine phosphates, phosphates, thiophosphates, phosphorothionates and mixtures of these components. To the commercially available anti-wear additives include IRGALUBE ^® TPPT, IRGALUBE ^® 232, IRGALUBE ^® 349, IRGALUBE ^® 211 and ADDITIN ^® RC3760 Liq 3960, FIRC-shun ^® FG 1505 and FG 1506 NA-LUBE ^® KR-015FG, LUBEBOND ^®, FLUORO ^® FG, SYNALOX ^® 40-D, ACHESON FGA ^® 1820 and ACHESON ^® FGA 1810th Further, the grease may include solid lubricants such as PTFE, BN, pyrophosphate, Zn oxide, Mg oxide, pyrophosphates, thiosulfates, Mg carbonate, Ca carbonate, Ca stearate, Zn sulfide, Mo sulfide, W sulfide, Sn Sulfide, graphites, graphene, nano-tubes, SiO 2 modifications or a mixture thereof.

Practical experiments have shown that the high temperature oil or fat according to the invention has up to a temperature of 250 ° C no or negligible decomposition phenomena. By this is meant that less than 10% of the lubricant decomposes.

The high-temperature oil or fat according to the invention may contain, as another base oil, an oil, preferably selected from the group consisting of mineral oil, aliphatic carboxylic acid and dicarboxylic esters, fatty acid triglycerides, pyromellitic esters, diphenyl ethers, phloroglucinic esters and / or poly-alpha-olefins, alpha-olefin Contain copolymers.

In a particular embodiment, the high temperature oil or fat according to the invention contains an estolide, preferably the main constituents of the estolide being obtained by chemical or enzymatic processes starting from native oils from the group of sunflower oil, rapeseed oil, castor oil, linseed oil, corn oil, diest oil, soybean oil, linseed oil Practical tests have shown that the high-temperature oil or fat according to the invention, due to its physical and chemical properties, is outstandingly suitable for use in chains, roller bearings and slide bearings , in the vehicle technology, the conveyor technology, the mechanical engineering, the office technology as well as in industrial plants and machines, in addition, in the ranges of household machines and the consumer electronics.Thanks to its good temperature resistance it can also be used at high operating temperatures up to 260 ° C, preferably be used at temperatures of 150 to 250 ° C.

The invention further relates to a process for the preparation of the above-described High temperature oils or fats, in which the base oils and the additives are mixed together.

The invention will now be explained in more detail with reference to the following examples.

Examples 1 to 2

Preparation of a high-temperature oil according to the invention Estolides or aliphatically substituted naphthalenes are initially charged in a stirred tank. At 100 ° C, the polyisobutylene and optionally a further oil is added with stirring. Subsequently, the mixture is stirred for 1 h to obtain a homogeneous mixture. The anti-wear agents and the antioxidant are added to the kettle at 60 ° C with stirring. After about 1 hour, the finished oil can be filled into the containers provided.

Composition of high temperature oils: Table 1

Example 1 Comparative Example 1

Trimellitate 0.0 63.0

Estolid 1 44.0 0.0

Estolid 2 19.0 0.0

hydrogenated PIB 30.4 30.4

Amine Antioxidant 2.0 2.0

phenolic antioxidant 1, 0 1, 0

Wear protection EP / WA 3,5 3,5

Corrosion protection 0,1 0,1

Solubility of the very good (4) very good (4)

arrears Table 2

Example 2 Comparative Example 2

Trimellitate 1 0 76.0

alkylated naphthalene 76.0 0.0

hydrogenated PIB 20.0 20.0

Amine Antioxidant 4.0 4.0

Solubility of the very good (4) very good (4)

arrears

The basic data of the oil examples can be found in Table 3.

Table 3

Furthermore, the friction behavior of the oils in the SRV was measured on the basis of DIN 51834-2 and the evaporation loss in the dynamic TGA. The results are shown in Tables 4 and 5 and are shown graphically in Figs. Table 4

Table 5

Examples 3 to 8

Production of a high-temperature fat according to the invention

The base oil is placed in a stirred tank. At 100 ° C, the polyisobutylene and optionally a further oil and the thickener is added with stirring. _lg

The thickener is formed by an in situ reaction of the reactants used in the base oil. Subsequently, the mixture is heated to 150 ° C to 210 ° C, stirred for several hours and cooled again. In the cooling process at about 60 ° C, the necessary anti-wear agents, antioxidants and corrosion inhibitors are added. A homogeneous mixture of the fat is obtained by the final homogenization step on roller, colloid mill or Gaulin.

The compositions of the high temperature fats are shown in Table 6.

Table 6

The thickeners used in Examples 3 to 8 are:

Example 3: LiOH, 12-hydroxystearic acid, azelaic acid,

Example 4: LiOH, 12-hydroxystearic acid, azelaic acid,

Example 5: LiOH, 12-hydroxystearic acid, azelaic acid,

Example 6: Di-urea; Methylene diphenyl diisocyanate (MDI), octylamine,

oleylamine

Example 7: Di-urea; MDI, octylamine, oleylamine

Example 8: Di-urea; MDI, octylamine, oleylamine The general characteristics of the fat patterns 3 to 8 are shown in Table 7.

Table 7

The evaporation losses of the different fat samples at 150 ° C after 30 h are between 2% and 5%, which underlines the very good thermal stability of these fat concepts.

A decisive influence on the lubricating effect of a grease has the oil separation. It is important to ensure that on the one hand, the oil separation is not too high and the oil runs out of the warehouse and thus the Tribo system is no longer available and on the other hand no oil separation is observed and the lubricating effect of the grease is lost. Ideally, the oil separation should be between 0.5 and 8% by weight in order to form an optimum lubricating film in the bearing.

The greases of the examples were subjected to a FE 9 rolling bearing test according to DIN 51 821 in which the service life of the greases investigated is determined and the upper service temperature of greases in roller bearings at medium speeds and average axial loads is determined. _lg

The fats tested and the results of the L10 and L50 values are shown in Table 8.

Table 8

Table 8 shows that the runtimes through the use of PIB in combination with various base oils have long run times and are thus suitable for high application temperatures in continuous operation.

Furthermore, the noise behavior after the fats was measured according to SKF Be Quiet ⁺ according to Examples 3 to 8. The results are shown in Table 9.

Table 9

The noise behavior of the various fat formulations is very positively influenced by the use of fully hydrogenated polyisobutylene. With the exception of Example 6, good to very good noise properties can be achieved.

The property of the fat of Example 3 using fully hydrogenated PIB was now compared to a fat (Comparative Example 3) containing a PIB still having double bonds, that is, a non-fully hydrogenated PIB.

The other composition of the fat according to Comparative Example 3 corresponded to that of Example 3. Table 10

Comparison of the fats with fully hydrogenated PIB and non-fully hydrogenated PIB in Table 10 shows that the Example 3 grease exhibits a doubled run time in the FE9 test, has lower evaporation losses and significantly better noise performance. To demonstrate the beneficial properties of the oil containing fully hydrogenated PIB, this was compared to an oil containing a partially hydrogenated PIB. Table 11 shows the results. Table 1 1

4 = residue after complete evaporation very good dissolvable

3 = residue readily dissolvable after complete evaporation

2 = residue partially soluble after complete evaporation

1 = residue can not be dissolved after complete evaporation

Table 1 shows that there are marked differences in the use of fully hydrogenated and partially hydrogenated PIB. Thus, the dissolution of the residue based on the partially hydrogenated PIV is no longer possible, while the oil with the fully hydrogenated PIB has very good Wiederanlösungseigenschaften.

Claims

High-temperature lubricant claims

1. comprising high temperature oil

a) 93.9 to 45 wt .-% of at least one oil selected from the group consisting of alkylaromatics, estolides, trimellitic acid esters, or a mixture of different Trimellitsäureestern, wherein the alcohol group of the ester is a linear or branched alkyl group having 8 to 16 carbon atoms is;

c) 0.1 to 10 wt .-% of additives individually or in combination, selected from the group consisting of corrosion protection additives, antioxidants, anti-wear additives, UV stabilizers, inorganic or organic solid lubricants.

2. High-temperature oil according to claim 1, wherein the Olkomponete as another oil, a compound selected from the group consisting of mineral oil, aliphatic carboxylic acid and dicarboxylic acid esters, fatty acid triglycerides, Pyromellitsäureester, diphenyl ether, Phloroglucinester and / or poly-alpha-olefins, alpha-olefin Includes copolymers.

3. comprising high temperature grease

a) 91, 9 to 25 wt .-% of at least one oil selected from the group consisting of alkylaromatics, estolides, trimellitic esters, or a mixture of different Trimellitsäureestern, wherein the alcohol group of the ester is a linear or branched alkyl group having 8 to 16 carbon atoms is;

b) from 6 to 45% by weight of a polymer selected from the group consisting of a hydrogenated or fully hydrogenated polyisobutylene or a mixture of hydrogenated or fully hydrogenated polyisobutylene;

d) 2 to 20 wt .-% thickener.

4. High-temperature fat according to claim 3, wherein the oil component as a further oil selected from the group consisting of mineral oil, aliphatic carboxylic acid and dicarboxylic acid esters, fatty acid triglycerides, Pyromellitsäureester, diphenyl ether, Phloroglucinester and / or poly-alpha-olefins, alpha-olefin Includes copolymers.

5. High temperature grease according to claim 3, wherein the thickener is selected from the group consisting of urea, AI complex soaps, metal soaps of the elements of the first and second main group of the perriodic system, metal complex soaps of the elements of the first and second main group of the periodic table, bentonites , Sulfonates, silicates, Aerosil, polyimides, PTFE or a mixture of the aforementioned thickeners.

6. High temperature oil or high temperature grease according to claim 1 or 3, wherein the alkylaromatic compound is an aliphatic substituted naphthalene.

7. Use of high-temperature oil or high-temperature fat after one of the preceding claims for lubricating rolling and plain bearings, in vehicle technology, materials handling, mechanical engineering, office technology and in industrial equipment and machinery, but also in the fields of home appliances, consumer electronics and lubrication of chains, track rollers and belts from continuous

Press.