KR101931511B1 - High-temperature lubricant for use in the food industry - Google Patents

Abstract

The present invention relates to food grade high temperature lubricants, more specifically to high temperature oils and high temperature greases comprising a) a mixture of trimellitic esters and other trimellitic esters, alkylaromatics (preferably, Naphthalene substituted with aliphatic), and at least one oil selected from esterolide; b) hydrogenated polyisobutylene, fully hydrogenated polyisobutylene, or mixtures thereof; And c) one or more additives. In the case of high temperature grease, a thickener is added.

Description

{High-temperature lubricant for use in the food industry}

The present invention relates to high temperature lubricants, and more particularly to aromatic esters such as trimellitic esters, mixtures of different trimellitic esters, heteroaromatic compounds, and estolides; And a high temperature oil based on fully hydrogenated polyisobutylene, hydrogenated polyisobutylene, or mixtures thereof. The high temperature lubricant may be a high temperature grease if a thickener is added to the lubricant component. The present invention also relates to the use of these high temperature lubricants for lubricating devices used in food processing.

In addition to lubrication, the lubricant must perform many other functions that exhibit cooling, reduced friction, wear, and force transmission, corrosion protection, and at the same time a sealing effect.

Conventional lubricants are not suitable for high temperature applications, for example because they are destroyed at high temperatures through oxidation and / or pyrolysis reactions and polymerization reactions and the lubricating properties are severely limited. In the case of the decomposition reaction, the lubricant is decomposed into volatile components of a low molecular mass. Evaporation of these components causes undesirable changes in viscosity, loss of oil, and excessive vapor formation. The result is a loss of lubricity. Polymerization also causes the lubricant to lose lubricity due to the formation of insoluble polymerized products.

Removing these impurities increases the maintenance effort and creates chemical waste that must be removed, which is costly and inconvenient. These increase the time and effort for cleaning and maintenance, increasing downtime. Overall, the use of unsuitable lubricants in high temperature applications results in high costs, because the equipment is contaminated and there is a large demand for lubricants. Also, the quality of the product is deteriorated.

Base oils used for application at high temperatures are usually synthetic esters because they have very good oxidative, hydrolytic, and thermal stability.

To meet the various requirements in high temperature applications, the lubricant should exhibit quality including high stability, low coefficient of friction, and high wear resistance. To ensure a uniform lubrication even at high temperatures, a lubricating film must be maintained between the metal parts during the machining process. Thus, at the maximum processing temperature, the lubricant should hardly cause evaporation, form almost no residue, and form as little cracking residue as possible.

High processing temperatures are frequently associated with use in food processing such as cooking, baking, boiling, baking, stewing, sterilization, frying, and steaming. Various types of devices are used in these tasks. Lubrication of this device requires a high temperature resistant lubricant.

Base oils for food processing lubrication systems require special requirements for compatibility with the environment and toxicity. Basically, food grade lubricants should have H1 fitness when the lubricant is in contact with food, beverages, and food, either directly or indirectly. Preferred applications in the food industry include baking ovens, chains in other high temperature applications, and auxiliary transport means, more specifically trolleys and bearings.

These lubricants are subject to the same legal provisions as NSF / H1 or NSF / H2 certifications.

The grade "H1" must be met by a lubricant in "incidental food contact", which means that there is occasionally technically inevitable contact with food. However, even if "H1" lubricants are used, intended or continuous contact should be excluded. The "H2" rating can be obtained by a non-toxic, non-carcinogenic lubricant. Nevertheless, when using "H2" lubricants, any contact with the food should be ruled out.

A disadvantage of conventional food grade lubricants used in high temperature applications is that they often lack satisfactory technical performance. For this reason, the food grade lubricants used so far have excellent oxidation resistance and acceptable pour points, but the residual behavior after complete evaporation does not comply with the stringent requirements required in high temperature applications. After a period of time, the cracking residues that produce the precipitate should be removed again. In this case, in general, the plant must be shut down and the remainder removed or the parts replaced. Thus, there is a need for high temperature lubricants wherein the evaporation of the base oil component of the oil is greatly reduced and the lubricity is not lost constantly at relatively high temperatures over a long period of time.

It is an object of the present invention to provide satisfactory tribological properties as well as to provide a high temperature oil and high temperature grease which meet the criteria of NSF / H1 lubricant. In particular, the lubricant of the present invention exhibits excellent lubricity at high temperature for a long time. In addition, the cracking residue formed does not show "varnishing" and is instead redissolved by fresh oil. In addition, high temperature lubricants have good stability to hydrolysis, are resistant to corrosion and abrasion, and have low temperature behavior adapted to good oxidation resistance and requirements.

The food grade high temperature oil of the present invention which achieves the above object comprises the following components:

(1) to (2) of a) trimellitic acid tri (iso-C ₁₀ ) ester (1) and trimellitic acid tri (iso-C ₁₃ ) ester (2) 99.9 to 45 wt.% Of at least one oil selected from the group consisting of aliphatic (preferably naphthalene-substituted naphthalene), alkylaromatics (preferably aliphatic substituted naphthalene), and esterol;

b) 6 to 45 wt% hydrogenated polyisobutylene, fully hydrogenated polyisobutylene, or mixtures thereof; And

c) 0.1 to 5 wt% of one or more additives selected from the group consisting of corrosion inhibiting additives, antioxidants, antiwear additives, ultraviolet stabilizers, inorganic solid lubricants, and organic solid lubricants.

The food grade high temperature grease of the present invention comprises the following components:

(1) to (2) of a) trimellitic acid tri (iso-C ₁₀ ) ester (1) and trimellitic acid tri (iso-C ₁₃ ) ester (2) 99.9 to 30 wt% of at least one oil selected from the group consisting of an alkyl aromatic compound (preferably an aliphatic substituted naphthalene), and an ester;

b) 6 to 45 wt% hydrogenated polyisobutylene, fully hydrogenated polyisobutylene, or mixtures thereof;

c) 0.1 to 5 wt% of one or more additives selected from the group consisting of corrosion inhibiting additives, antioxidants, antiwear additives, ultraviolet stabilizers, inorganic solid lubricants, and organic solid lubricants; And

d) 2 to 20 wt% thickener.

Surprisingly, it has been found that the high temperature oils and high temperature greases of the present invention are not only suitable for the H1 grade, but also exhibit excellent performance. For this reason, the high temperature oil or high temperature grease of the present invention exhibits high thermal stability with long life and good lubrication properties.

The high temperature oil and high temperature grease of the present invention is an ester compound comprising a trimellitic ester of a mixture of other trimellitic esters wherein the alcohol group is a linear or branched alkyl group having from 8 to 16 carbon atoms. Depending on the selection of the aromatic ester, it is possible to control the properties of the lubricant, such as viscosity, viscosity / temperature behavior, oxidation resistance, and residue properties.

According to a particularly preferred embodiment of the invention, the aromatic ester is selected from the group consisting of alcohols with steric hindrance as an alcohol component, preferably alcohols having 8 to 16 carbon atoms, more particularly 10 to 13 carbon atoms, more particularly iso-C ₁₀ ) ester (1) and trimellitic acid tri (iso-C ₁₃ ) ester (2). The mixing ratio of (1) and (2) is from 99: 1 to 1:99; Particularly preferably, the mixing ratio (1): (2) is 87:12.

The hot oil or hot grease of the present invention may comprise a second oil comprising an aromatic compound. An aromatic compound for the purposes of the present invention is a monocyclic, bicyclic or tricyclic ring system having from 4 to 15 carbon atoms, wherein the monocyclic system is an aromatic compound or a bicyclic or tricyclic system Lt; / RTI > is an aromatic compound. It is preferred to use a bicyclic system having preferably 10 carbon atoms.

The aromatic compound is preferably substituted with at least one aliphatic substituent. Particularly preferably, the aromatic compound is substituted by 1 to 4 aliphatic substituents and more particularly by 2 or 3 aliphatic substituents.

The alkyl group according to the present invention is a saturated aliphatic hydrocarbon group having from 1 to 30, preferably from 3 to 20, more preferably from 4 to 17, and more particularly from 6 to 15 carbon atoms. The alkyl group may be linear or branched and is optionally substituted by one or more of the above-mentioned substituents.

Practical tests have shown that mixtures of differently substituted naphthalenes, i.e. mixtures of naphthalenes with different degrees of substitution and different aliphatic substituents, are particularly suitable. By varying the composition of the mixture, it can be adjusted in a particularly simple manner, for example in the case of properties such as the viscosity of hot lubricants. Aliphatic substituted naphthalenes are also known for their excellent dissolution characteristics and high thermal oxidation stability.

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

In addition, the esterolide can also be used as component a). The preferred viscosity measured at 40 ° C is 30 to 500 mm ² / s. Particularly preferably 30 to 140 mm ² / s.

Estolide means an ester compound prepared from an acid or enzyme catalyst from a fatty acid, preferably oleic acid, or dicarboxylic acid. In this reaction, the acid function attacks double bonds of adjacent fatty acid molecules to form an ester mixture of increased molecular weight. The acid group is then esterified with an alcohol, preferably 2-ethylhexanol, and the remaining double bonds are later hydrogenated or esterified with a carboxylic acid, such as acetic acid. For example, other alcohols such as isoamyl alcohol or Guerbet alcohol may likewise be capable of esterification of the terminal acid group.

Further esters can also be synthesized by condensation of hydroxycarboxylic acids, examples being oleic acid or derivatives of stearic acid. The chain length of the hydroxycarboxylic acid or unsaturated acid used may range from C ₆ to C ₅₄ . The acid may contain a group containing additional functional groups, for example, an amine, an ether, a sulfur. Also, esterification with alpha-olefin or beta-farnesene may be possible.

The high temperature oil or high temperature grease of the present invention further comprises polyisobutylene. With respect to the appropriate choice of polyisobutylene, in particular with respect to degree of hydrogenation and molecular weight, it is possible to influence, for example, the kinetic viscosity in a manner favorable to the properties of the oils and greases of the invention Do. Hydrogenated polyisobutylene, fully hydrogenated polyisobutylene, and mixtures thereof may also be used. It is preferred to use fully hydrogenated polyisobutylene. The polyisobutylene is present in the composition in an amount of from 6 to 45 wt%, preferably from 10 to 45 wt% and more particularly from 15 to 45 wt%.

According to a further preferred embodiment, the polyisobutylene has a number-average molecular weight of from 115 to 10,000 g / mol, preferably from 160 to 5,000 g / mol.

The high temperature oil or grease of the present invention further comprises from 0.1 to 5 wt% of an additive selected from the group consisting of corrosion inhibiting additives, antioxidants, antiwear additives, ultraviolet stabilizers, inorganic solid lubricants, and organic solid lubricants Selected and used in one or more than two.

The high temperature grease of the present invention further comprises a thickener. The thickener in the high temperature grease of the present invention in the lubricant component is a diisocyanate, preferably 2,4-diisocyanate toluene, 2,6-diisocyanate toluene, 4,4'-diisocyanate diphenylmethane, 2,4 '- diisocyanate phenyl methane. Diisocyanate biphenyl, 4,4'-diisocyanate-3,3'-dimethylphenyl, or 4,4'-diisocyanate-3,3'-dimethylphenyl methane, An amine of the formula R'2-NR, or a diamine of the general formula R'2-NR-NR'2, wherein R is an aryl, alkyl or alkylene radical having from 2 to 22 carbon atoms And R 'is the same or different hydrogen or alkyl, alkylene or aryl radical, or a mixture of amine and diamine,

or

Aluminum complex soap, simple metal soap of the first and second typical elements of the periodic table, first and second typical element metal composite soaps of the periodic table, bentonite, sulfonate, silicate, aerosil ( Aerosil), polyimide or PTFE, or mixtures of the above thickeners.

To comply with the statutory provisions applicable to the use of lubricants for food processing lubrication systems, it is useful to have H1 grades of additives used.

The addition of an antioxidant may reduce or even prevent oxidation of the oil or grease of the present invention, especially during its use. In the case of oxidation, undesired free radicals can be formed and consequently the decomposition reaction can be increased in hot lubricants. The addition of an antioxidant stabilizes the hot oil or grease.

Particularly suitable antioxidants according to the invention are the following food grade compounds:

Diaromatic amines, phenolic resins, thiophenolic resins, phosphites, butylated hydroxytoluene, butylated hydroxyanisole, and the like. Naphthylamine, phenyl-alpha-naphthylamine, phenyl-beta-naphthylamine, octylated / butylated diphenylamine, Di-alpha-tocopherol, di-tert-butylphenyl, benzenepropanoic acid and mixtures of these constituents.

Commercially available food grade additives include:

IRGANOX 占 1010 (benzeneepropanoic acid, 3,5-bis (1,1-dimethylethyl) -4-hydroxy-2,2-bis [[3- [3,5- 1-dimethylethyl) -4-hydroxyphenyl] -1-oxopropoxy] methyl] -1,3-propanediyl ester (3,5-bis , 2-bis [[3- [3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] -1-oxopropoxy] methyl] -1,3-propanediyl ester; IRGANOX® L06 Naphthylamine or N-phenyl-ar (1,1,3,3-tetramethylbutyl) -1-naphthalenamine (N-phenyl- 3-tetramethylbutyl) -1-naphthalenamine);

IRGANOX® L01 (dioctylated diphenylamine);

IRGANOX® L57 (a mixture of alkylated diphenylamines);

IRGANOX (R) L06;

IRGANOX® L115;

IRGANOX® L150 (high molecular weight amine and phenolic antioxidants);

A mixture of IRGANOX® L64 (mono- and dialkyl-butyl / octyl-diphenylamine);

IRGANOX (R) 1035; (Mixture consisting of thiodiethylene bis (3,5-di-tert-butyl-4-hydroxyhydrocinnamate));

IRGANOX (R) 1010;

IRGANOX® L101 (tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] butyl-4-hydroxyphenyl) propionato] methane));

IRGANOX® L109 (benzeneepropanoic acid, 3,5-bis (1,1-dimethyl) -4-hydroxy-1,6-hexenylindyl ester (3,5-bis ) -4-hydroxy-1,6-hexanediyl ester));

IRGANOX® L57;

IRGANOX® L109;

LRGalube® TPPT;

IRGANOX® L115 (benzenepropanoic acid, 3,5-bis (1,1-dimethylethyl) -4-hydroxcandio-2,1-ethynediyl ester (3,5-bis -dimethylethyl) -4-hydroxythio-2,1-ethanediyl ester));

IRGANOX 占 E201 (liquid DL-alpha-tocopherol, 2H-1-benzopyran-6-ol), 3,4-dihydro- , 3,4,8-tetramethyl-2- (4,8,12-trimethyltridecyl);

A mixture comprising IRGAFOS® 168 (tris (2,4-di-tert-butylphenyl) phosphate) (tris (2,4-di-tert-butylphenyl) phosphate);

ADDITIN® RC7130 (N-phenyl-1-naphthylamine);

Na-LUBE® A0142 (liquid, diphenylamine-based antioxidant);

VANLUBE® 961 (a mixture of octylated and butylated diphenylamine or benzenamine), a mixture of N-phenyl, 2,4-trimethylpentane and 2-methylpropene Reaction product of 2,4-trimethylpentane and 2-methylpropene);

A mixture comprising VANLUBE 占 PCX (1-hydroxy-4-methyl-2-6-di-tert-butylbenzene), hexamethylene bis (3,5-di-tert-butyl-4-hydroxyhydrocinnamate));

LRGafox® 168; Reaction products of N-phenylbenzenamine and 2,4,4-trimethylpentene;

Thioethylene bis (3,5-di-tert-butyl-4-hydroxyhydrocinnamatomethane);

Bis (4- (1,1,3,3-tetramethylbutyl) phenyl) amine; bis (4- (1,1,3,3-tetramethylbutyl) phenyl) amine;

3,5-bis (1,1-dimethylethyl) -4-hydroxy ester; 3,5-bis (1,1-dimethylethyl) -4-hydroxy ester;

Thiodi-2,1-ethanediyl ester.

The high temperature oil or grease of the present invention may also comprise a corrosion inhibiting additive, a metal deactivator or an ion complexing agent. These may be triazole, imidazoline, N-methylclycine (sarcosine), benzotriazole derivatives, N, N-bis (2-ethylhexyl) ; n- methyl -N (1- oxo-9-octadecenyl) glycine, phosphoric acid, and (C _{11 -14)} - alkylamine and the reaction mono- and diimide sook mixture of butyl esters, phosphoric acid, and tert-alkyl amine and 1 A mixture of mono- and diisooctyl esters reacted with a (C _12-14 ) -amine, dodecanoic acid, triphenylphosphotitanate, and amine phosphate. Commercially available additives include: IRGAMET ^® 39, IRGACOR ^® DSS G, Amine O; SARKOSY ^® O (Ciba), COBRATEC ^® 122, CUVAN ^® 303, VANLUBE ^® 9123, CI - 426, CI - 426EP, CI429, and CI - 498.

Additional abrasion resistant additives are amines, amine phosphates, phosphate triphosphates, phosphorothionates, and mixtures of these components. Commercially available abrasion resistant 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 1810.

The oil or grease may be selected from the group consisting of PTFE, BN, Na pyrophosphate, Zn oxide, Mg oxide, Zn pyrophosphate, Na thiosulfate, Mg carbonate, A solid lubricant having food compatibility such as Ca carbonate, Ca stearate, Zn sulfide, or a mixture thereof.

Through practical experiments, it has been shown that the high temperature oil or grease of the present invention does not exhibit decomposition phenomenon to a temperature of 250 DEG C or a decomposition phenomenon which can be neglected. This means that less than 10% of the lubricant is degraded.

As a further food grade base oil, the hot oils or greases of the present invention preferably comprise mineral oil, aliphatic carboxyl and dicarboxylic esters, fatty acid triglycerides, and / or poly-alpha-olefins can do.

In one particular embodiment, the hot oils or greases of the present invention comprise esters, and the major components of the esters are preferably sunflower oil, rapeseed oil, castor oil, linseed oil, corn oil, safflower oil, soybean oil , Natural or synthetic oils, flaxseed oil, peanut oil, "Lesqueral" oil, palm oil, olive oil, or mixtures of these oils.

According to actual experiments, it has been found that the high temperature oil or grease of the present invention can be used for a lubricating apparatus for food processing based on its physical and chemical properties. Because of its excellent temperature resistance, it can be used at temperatures as high as 260 [deg.] C, preferably 150 to 250 [deg.] C, and an example of a chain of baking ovens.

The present invention also relates to a method for producing a high temperature oil or grease as described above, wherein said base oil and additives are mixed with one another.

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

Examples 1 to 7

Production of the hot oil of the present invention for the food industry

Two trimellitic esters are charged into the stirred vessel. At 100 ° C, with stirring, polyisobutylene and optionally further oil are added. The mixture is then stirred for 1 hour to obtain a homogeneous mixture. Abrasion resistance and antioxidants are added to the vessel with stirring at 60 ° C. After about 1 hour, the oil obtained can be dispensed into the intended container.

Composition of hot oil:

Table 1 shows the redissolution of the oil residue after complete evaporation of the oil as a function of the composition of the hot oil and the amount of polyisobutylene added.

Ex. One Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Completely hydrogenated polyisobutylene 24.41 22.0 19.53 17.1 14.63 12.2 9.76 C ₁₀ Bimetallic Trimellitic Ester (1) 71.52 73.91 76.35 78.76 81.2 83.61 86.02 Branched trimellitic ester (2) 0.72 0.74 0.77 0.79 0.82 0.84 0.87 Viscosity 40 ° C mm ² / s 426.8 375.5 328.7 292.7 259 228.8 202.8 Solubility of residues after 72 h / 250 ° C 4 3 3 2 One One One (Varnish) (Varnish) (Varnish)

4 = residues immediately soluble after complete evaporation

3 = residues that are readily soluble after complete evaporation

2 = Residue partially dissolved after complete evaporation

1 = residue that does not dissolve after complete evaporation

All figures are% by weight. The balance of 100 wt% is constituted by the addition of additives, especially aminic and / or phenolic antioxidants, corrosion inhibiting additives, abrasion resistant additives EP / AW and metal deactivators.

This result shows that residues produced after complete evaporation can be remelted using fresh oil, from 40 ° C to kinematic viscosity of 292.7 mm 2 / s. The composition according to Example 1 shows the best properties in the viscosity and redissolving plots.

The following Examples 8 to 10 show superior properties of the food grade hot oil of the present invention in relation to solubility when different components a) are used as an oil as compared to Comparative Examples 1 to 3. [

Example  8 to 10

The composition of the oil (all values expressed in wt%)

Embodiment 8 of the Invention Comparative Example 1 Trimellitate 1 70.0 52.65 Trimellitate 2 0.7 44.0 Hydrogenated PIB 25.95 0.0 Aminic antioxidant 0.5 0.5 Phenolic antioxidant 1.5 1.5 Abrasion Resistant Additive EP / WA 1.0 1.0 Corrosion inhibitor 0.25 0.25 Metal deactivator 0.1 0.1 Solubility Very good (4) Poor (1)

Embodiment 9 of the Invention Comparative Example 2 Trimellitate 1 0.0 52.65 Trimellitate 2 0.0 44.0 Alkylated naphthalene 70.65 0.0 Hydrogenated PIB 26.0 0.0 Aminic antioxidant 0.5 0.5 Phenolic antioxidant 1.5 1.5 Abrasion Resistant Additive EP / WA 1.0 1.0 Corrosion inhibitor 0.25 0.25 Metal deactivator 0.1 0.1 Solubility Very good (4) Poor (1)

Embodiment 10 of the Invention Comparative Example 3 Trimellitate 1 0.0 52.65 Trimellitate 2 0.0 44.0 Esolide 1 40.4 0.0 Estradiol 2 23.25 0.0 Hydrogenated PIB 33.00 0.0 Aminic antioxidant 0.5 0.5 Phenolic antioxidant 1.5 1.5 Abrasion Resistant Additive EP / WA 1.0 1.0 Corrosion inhibitor 0.25 0.25 Metal deactivator 0.1 0.1 Solubility Very good (4) Poor (1)

Table 5 provides an illustrative description of the food grade high temperature grease of the present invention below.

Ex. 11 Ex. 12 Ex. 13 Ex. 14 Ex. 15 Ex. 16 Trimellitate 1 46.3 0.0 46.3 39.0 46.3 46.3 Trimellitate 2 17.1 0.0 17.1 20.0 17.7 17.7 Esolide 1 0.0 38.4 0.0 0.0 0.0 0.0 Estradiol 2 0.0 25.6 0.0 0.0 0.0 0.0 Alkylated naphthalene 0.0 0.0 0.0 0.0 0.0 0.0 Fully hydrogenated PIB 25.0 25.0 25.0 25.0 25.0 25.0 Antioxidant 1.0 1.0 1.0 1.0 1.0 1.0 Thickener 10.6 10.0 10.6 15.0 10.0 10.0

To determine the resolu- tivity, the samples were conditioned at 250 ° C for 72 hours. The residue was redissolved using each base oil of the grease specimen. In all the examples, the redissolution was excellent.

The thickeners used in Examples 11 to 16 are composite Li (Ex. 11 and 12), Composite Al (Ex. 13), Bentonite (Ex. 14), Simple Ca (Ex. , And elements (Ex.

[Table 5 Continued]

The redissolution of the oil residue after complete evaporation at two different temperatures (220 ° C / 120 h) and (220 ° C / 120 h) is also a function of the mixing ratio of the two trimellitic esters (1) and (2) Respectively. The concentration of completely hydrogenated PIB remained constant at 25 wt%. Surprisingly, it has been found that redissolution at both temperatures depends on the mixing ratio of the two trimellitic esters. The mixing ratio of 0.02, that is to have a non-iso -C ₁₃ trimellitic ester tick higher than the iso -C ₁₀ ester, the residue does not re-dissolved in fresh oil, the amount of iso -C ₁₀ ticks trimellitic ester many, , The solubility increases markedly, as can be seen from Fig. The saturation point reaches a mixing ratio of 1: 1. The values are shown in Table 6.

Ratio iso-C ₁₀ / iso-C ₁₃
Solubility of residues after complete aging 250 ° C / 72h 220 ° C / 120h 0.02 One One 0.33 2 3 1.00 3 4 2.97 3 4 87.12 3 4

4 = residues immediately soluble after complete evaporation

3 = residues that are readily soluble after complete evaporation

2 = Residue partially dissolved after complete evaporation

1 = residue that does not dissolve after complete evaporation

Thus, the solubility of the residue could be shown to depend not only on the degree of hydrogenation of the polyisobutylene but also on the mixing ratio of the two esters. Two esters must be used to ensure H1 rating of the hot oil. The mixing ratio can be freely selected, and the preferred range starts from a 1: 1 mixture. A particularly preferred ratio is _{87.12 (iso-C 10 / iso} -C 13).

The above-described food grade hot oil and hot grease can also be used for lubrication equipment subject to restrictions similar to those imposed on the lubricant. This includes the cosmetics and pharmaceutical industry and the animal feed industry.

In the food industry, the hot lubricants of the present invention can also be used as hydraulic oils in the food industry, lubrication apparatus for food processing, transport chains and control chains in the food industry, and devices for cereal, flour, and animal feed processes , And baking ovens.

For certain applications, use in spray form is advantageous.

Claims (10)

(1) to (2) of a) trimellitic acid tri (iso-C ₁₀ ) ester (1) and trimellitic acid tri (iso-C ₁₃ ) ester (2) : 99), an alkylaromatic compound, and an esterolide; 93.9 to 45 wt%;
b) from 6 to 45 wt% of a polymer selected from the group consisting of hydrogenated polyisobutylene, fully hydrogenated polyisobutylene, or mixtures thereof; And
c) 0.1 to 5 wt% of at least one additive selected from the group consisting of corrosion inhibiting additives, antioxidants, antiwear additives, ultraviolet stabilizers, inorganic solid lubricants, and organic solid lubricants;
/ RTI > wherein the food grade high temperature oil comprises at least one fatty acid.
(1) to (2) of a) trimellitic acid tri (iso-C ₁₀ ) ester (1) and trimellitic acid tri (iso-C ₁₃ ) ester is from 99: 1 to 1:99 ), An alkyl aromatic compound, and at least one oil selected from the group consisting of esters;
b) from 6 to 45 wt% of a polymer selected from the group consisting of hydrogenated polyisobutylene, fully hydrogenated polyisobutylene, or mixtures thereof;
c) 0.1 to 5 wt% of at least one additive selected from the group consisting of corrosion inhibiting additives, antioxidants, antiwear additives, ultraviolet stabilizers, inorganic solid lubricants, and organic solid lubricants; And
d) 2 to 20 wt% thickener;
Wherein the food grade high temperature grease comprises:
The food grade high temperature oil of claim 1 wherein said alkylaromatic compound is an aliphatically substituted naphthalene.
The food grade high temperature grease of claim 2, wherein the alkylaromatic compound is an aliphatically substituted naphthalene.
The composition according to claim 1, characterized in that said component a) further comprises a compound selected from the group consisting of mineral oil, aliphatic carboxyl and dicarboxylic esters, fatty acid triglycerides, and poly-alpha-olefins as further food grade oils Food grade high temperature oil.
The composition according to claim 2, characterized in that the component a) further comprises a compound selected from the group consisting of mineral oil, aliphatic carboxyl and dicarboxylic esters, fatty acid triglycerides, and poly-alpha-olefins as further food grade oils Food grade high temperature grease.
The composition according to claim 2, wherein the component d) is selected from the group consisting of urea, aluminum composite soap, simple metal soaps of the first and second typical elements of the periodic table, metal composite soaps of the periodic table first and second typical elements, bentonite, , Aerosil, polyimide, PTFE and mixtures of the above-mentioned thickeners.
The method according to any one of claims 1, 3, and 5 for use in a lubricating treatment device for food processing as a hydraulic oil in the food industry, for a conveying chain and a control chain, for a cereal, flour, , And a baking oven device.
A method according to any one of claims 2, 4, 6 and 7 for use in a lubricating treatment device for food processing as a hydraulic oil in a food industry, a conveying chain and a control chain, a cereal, a flour, For use in a process unit of a food grade baking oven apparatus.
The food grade high temperature oil according to any one of claims 1, 3 and 5, characterized in that it is a spray oil.

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