JPH0694556B2 - Lubricating oil composition for food processing machinery - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lubricating oil composition for a food processing mechanism, and more specifically, it is excellent in low-temperature characteristics, oxidation stability, thermal stability and lubricity, and is extremely non-toxic to the human body. And a lubricating oil composition for a food processing machine.

Problems to be solved by conventional techniques and inventions Agricultural products, livestock products, marine products and other raw materials are carefully selected, classified, ground, mixed, roasted, heated, fermented, boiled, concentrated, dried, frozen, and then frozen. Various food processing machines are currently used in all steps up to. For example, even if only the main ones are shown, when it comes to processing agricultural products, such as rice milling machines, flour milling machines, brewing machines that produce sake, soy sauce, miso, etc., noodle making machines, bread making machines, confectionery machines, fruit juices, jams, pickles, etc. Processing machines include milk processing machines for dairy product processing, dairy products manufacturing machines such as cheese and butter, meat processing machines for manufacturing ham and sausage, and fish processing machines and seaweed processing machines for seafood processing. There are also machines for producing food additives, natural clavers and pharmaceuticals, such as vacuum thin film evaporators and kneaders.

Due to the fact that these food processing machines are machines that produce food that enters the human mouth and are involved in the taste of food, great care must be taken in its safety and hygiene.

Therefore, from the viewpoint of safety, animal and vegetable oils and liquid paraffin have been conventionally used as lubricating oils used for bearings, gears, slide guide surfaces, hydraulic systems, etc. of food processing machines. However, those using animal and vegetable oils have problems in oxidative stability, rust prevention and corrosion resistance, while those using liquid paraffin have problems in low temperature characteristics and lubricity, respectively.
It has been desired to develop a lubricating oil for food processing machines, which is superior to animal and vegetable oils and liquid paraffin.

Therefore, as a result of repeated research to develop a lubricating oil for food processing machines having further excellent performance, the present inventors have focused on the performance of a specific compound called squalane, and are further toxic to the human body. It has been found that by adding only a specific compound, it is possible to obtain a lubricating oil for a food processing machine which is superior in various performances to those obtained by using animal and vegetable oils or liquid paraffin, and completed the present invention.

INDUSTRIAL APPLICABILITY The present invention has excellent low-temperature characteristics, oxidation stability, thermal stability, lubricity, and is extremely nontoxic to the human body, as compared with those using animal and vegetable oils or liquid paraffin. An object of the present invention is to provide a lubricating oil composition for food processing machines.

Means for Solving the Problems The present invention includes two inventions, the specific invention of which is based on squalane as a base oil, in which (A) a polybutene having a number average molecular weight of 200 to 5,500 and / or a viscosity average. Polyisobutylene with a molecular weight of 8,000 to 500,000
0.1 to 80.0% by weight, and (B) 2,6-di-tert-butyl-p-cresol 0.0
The present invention provides a lubricating oil composition for food processing machines, characterized in that it contains 1 to 10.0% by weight as an essential component. The second invention uses squalane as a base oil, and based on the total amount of the composition. (A) Polybutene having a number average molecular weight of 200 to 5,500 and / or polyisobutylene having a viscosity average molecular weight of 8,000 to 500,000
0.1 to 80.0% by weight, (B) 2,6-di-tert-butyl-p-cresol 0.0
The present invention provides a lubricating oil composition for a food processing mechanism, which comprises 1 to 10.0% by weight and (C) 0.01 to 10.0% by weight of a fatty acid having 12 to 22 carbon atoms as an essential component.

Hereinafter, the content of the present invention will be described in more detail.

The base oil in the circulating oil composition for food processing machines of the present invention is squalane. Squalane is colorless transparent, tasteless and odorless liquid composed mainly of saturated hydrocarbons as 2,6,10,15,19,23 hexamethylphosphoric trachomatis San (chemical formula C ₃₀ H _62). Squalane is recognized as one of the epidermal lipid constituents of the human body and is a substance that is extremely non-toxic to the human body, such as being selected as a standard item for cosmetic raw materials.

Squalane is industrially obtained by separating and purifying squalene obtained from fish oil such as shark liver oil and vegetable oil such as olive oil by hydrogenation at high temperature and high pressure using a hydrogenation catalyst, and also as a raw material for isophytol synthesis. It is obtained by hydrogenolysis of a reaction product of available geranylacetone (which is synthesized from isoprene) and 1,3-butadiyne, which is a by-product in the production of acetylene by decomposition of natural gas.

Squalane used as the base oil in the present invention preferably has an iodine value of 1.0 or less, preferably 0.1 or less.

The component (A) in the present invention has a number average molecular weight of 200 to 5,50.
0, preferably 10,000-4,000 polybutene and / or viscosity average molecular weight 8,000-500,000, preferably 10,000-
It is 100,000 polyisobutylene. When the component (A) whose average molecular weight does not reach the above range is used, the viscosity and lubricity of the composition are inferior, while when the component whose number average molecular weight exceeds the above range is used, the viscosity of the component (A) Is too high, resulting in poor workability when blended with the base oil.

The polybutene referred to in the present invention means butene-1, butene-
A mixture of 2, isobutylene and butanes as an inactive ingredient is used as a raw material and produced by a conventionally known method. That is, for example, a BB fraction (butane-butene fraction) produced as a by-product when ethylene, propylene, butadiene, etc. are produced by naphtha decomposition is used as a raw material, and aluminum chloride, magnesium chloride, boron fluoride, titanium tetrachloride, etc. Friedel-Crafts catalyst or a complex compound thereof as a catalyst, a trace amount of water in the reaction system, an organic halide or hydrochloric acid as a cocatalyst, or without using a cocatalyst, a reaction temperature of about -30 ° C to 30 A typical production method is a method of polymerizing at ℃. When the BB fraction is used as the solvent, butane and unreacted olefin are used as the solvent, so that the solvent is not particularly used. The polybutene obtained in this way is usually a catalyst separated in a settling tank, followed by washing with an alkali, washing with water, washing with an aqueous solution of sodium or ammonium salt of nitric acid, sulfuric acid, oxalic acid, bauxite, activated clay, etc. The remaining trace amount of catalyst is completely removed by using various methods such as the method using the adsorbent described above, alone or in combination. Then, the unreacted gas is separated by a flash drum, and then the light polymer is separated by a stripper, and further purified in a purification tank if necessary. At present, the Amoco method and the Kosden method are known as typical methods for producing such polybutene.

Further, in the present invention, as the component (A), hydrogenated polybutene obtained by hydrogenating the double bond contained in the above polybutene by a known method, for example, nickel or nickel molybdate catalyst can be used.

The (B) polyisobutylene of the present invention is produced by a conventionally known method using isobutylene as a raw material. That is, for example, to the above-mentioned BB fraction, or to isobutylene synthesized by a method such as dehydration of tertiary butyl alcohol, dehydration of diacetone alcohol, or isobutylene highly purified by molecular sieve or the like, ethylene, Propane, hexane, etc. are added as diluents or without diluent, usually about -10 ° C to -150
A typical production method is to introduce boron trifluoride at a low temperature of ° C or add aluminum chloride as it is as a methyl chloride or ethyl chloride solution to polymerize.

As is clear from the fact that polybute and polyisobutylene are designated as food additives as chewing gum bases, they are extremely non-toxic substances for the human body.

The content of the component (A) in the present invention is 0.1 to 80.0% by weight, preferably 1.0 to 50.0% by weight, based on the total amount of the composition. When the component (A) is not used or when the content of the component (A) does not reach the above range, the viscosity and circulation of the composition are poor, while when the content exceeds the above range, the viscosity of the composition is high. It is not preferable because it becomes too much.

The component (B) in the present invention is 2,6-di-tertiary-butyl-p-cresol. As is clear from the fact that this 2,6-ditertiary-butyl-p-cresol is also designated as a food additive as an antioxidant, it is a substance that is extremely non-toxic to the human body.

The content of the component (B) in the present invention is 0.01 to 10.0% by weight, preferably 0.1 to 1.0% by weight, based on the total amount of the composition. When the component (B) is not used or when the content of the component (B) does not reach the above range, the composition is inferior in oxidation stability and thermal stability, while when the content exceeds the above range, the content becomes This is not preferable because it does not provide the effect of matching and the cost increases.

In the present invention, squalane is used as a base oil, and by containing the components (A) and (B) in a specific amount, excellent low temperature characteristics, oxidation stability, thermal stability, and lubricity,
Moreover, a lubricating oil composition for food processing machines, which is extremely non-toxic to the human body, can be obtained, but in the present invention, the component (C) can be blended in order to further improve its lubricity.

The component (C) in the present invention has 12 to 22 carbon atoms, preferably
16-18 fatty acids. These fatty acids are also designated as food additives as flavoring agents, and are also selected as standard items for cosmetic raw materials. As is clear, they are extremely nontoxic to the human body. As the component (C) in the present invention, specifically, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, arachidic acid, behenic acid, or a mixture thereof is preferably used, but particularly palmitic acid, stearic acid. Most preferably, oleic acid or mixtures thereof are used.

The content of the component (C) in the second invention of the present invention is 0.01 to 10.0% by weight, preferably 0.1 to 10.0% by weight based on the total amount of the composition.
It is 1.0% by weight. When the content of the component (C) does not reach the above range, the effect of improving the lubricity due to the blending of the component (C) is not sufficient, while when the content exceeds the above range, the oxidative stability of the composition decreases, Further, it is not preferable because the corrosiveness to the metal increases.

In the present invention, squalane is used as a base oil, and the components (A) and (B) are essential in the specific invention, and the component (C) is essential in addition to the components (A) and (B) in the second invention. By adding a specific amount as a component, it is possible to obtain a lubricating oil composition for food processing machines excellent in various performances, but to further improve the performance as a lubricating oil, it is necessary to add other additives. You can also

However, when blending other additives, it is necessary to use those that are non-toxic to the human body. Specifically, for example, higher fatty alcohols such as oleyl alcohol, animal and vegetable oils and fats or their partial hydrogen as oiliness agents. Additives, higher fatty acid esters such as methyl laurate and butyl stearate, tertiary-butyl hydroxyanisole as an antioxidant, sorbitan fatty acid esters such as sorbitan monooleate as a rust inhibitor, sucrose fatty acids such as sucrose monolaurate Examples thereof include esters.

These additives may be added alone or in combination of several kinds. The addition amount is also arbitrary, but usually, the individual addition amount is 20.0% by weight or less based on the total amount of the composition,
It is preferably 0.1 to 10.0% by weight.

Examples Hereinafter, the content of the present invention will be described more specifically with reference to Examples and Comparative Examples.

Examples 1 to 3 and Comparative Examples 1 and 2 With the compositions shown in Table 1, lubricating oil compositions for food processing machines according to the present invention were obtained (Examples 1 to 4). Its characteristics and performance were measured by the methods shown below, and the results were
Shown in the table.

[Viscosity and viscosity index]

It was measured according to "Kinematic viscosity test method for crude oil and petroleum products and petroleum product viscosity index calculation method" defined in JIS K 2283.

(Low temperature viscosity)

“LOW-TEMPERATURE VISC” defined in ASTM D 2983
OSITY OF AUTOMOTIVE FLUID LUBRICANTS MESURED
It was measured according to "BY BROOK FIELD VISCOMETER".

[Oxidation stability]

The oxidation life (min) was measured according to "Rotation cylinder type oxidation stability test method" specified in JIS K 2514 3.3.

[Abrasion resistance]

"WEAR PREVENTIVE CHAR described in ASTM D 4172
ACTERISTICS OF LIBRICATING FLUID (FOUR-BALL M
ETHOD) ", the wear diameter (mm) was measured under the conditions of 1,200 rpm, 15 kg, and 30 min.

For comparison, the characteristics and performances of animal and vegetable oils (soybean oil) (Comparative Example 1) and liquid paraffin (Comparative Example 2), which have been conventionally used as lubricating oils for food processing machines, were also measured, and the results are also shown. It is also shown in Table 1.

EFFECTS OF THE INVENTION As is clear from the results of the properties and performance evaluation tests shown in Table 1, the lubricating oil compositions for food processing machines of Examples 1 to 4 according to the present invention have been used conventionally animal and vegetable oils and Compared with liquid paraffin, the low-temperature characteristics (low-temperature viscosity) and oxidation stability were significantly improved, and the lubricity (wear resistance) was also improved, indicating that it has excellent performance.

Further, the compositions of Examples 3 and 4 according to the second invention of the present invention have further improved lubricity (wear resistance) as compared with the compositions of Examples 1 and 2 according to the specific invention, and (C ) The effect of blending the components is clearly shown.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C10M 143: 06 129: 40 129: 10) C10N 20:04 30:00 Z 8217-4H 30:08 30:10 40:00 Z 8217-4H (56) Reference JP 51-84803 (JP, A) JP 51-83606 (JP, A) JP 51-48068 (JP, A) JP 50-50303 (JP, A) JP-A-49-133302 (JP, A)

Claims (2)

[Claims] 1. Squalane as a base oil, and (A) polybutene having a number average molecular weight of 200 to 5,500 and / or polyisobutylene having a viscosity average molecular weight of 8,000 to 500,000 based on the total amount of the composition.
0.1 to 80.0% by weight, and (B) 2,6-di-tert-butyl-p-cresol 0.0
A lubricating oil composition for food processing machines, which contains 1 to 10.0% by weight as an essential component. 2. Squalane as a base oil, and (A) polybutene having a number average molecular weight of 200 to 5,500 and / or polyisobutylene having a viscosity average molecular weight of 8,000 to 500,000 based on the total amount of the composition.
0.1 to 80.0% by weight, (B) 2,6-di-tert-butyl-p-cresol 0.0
A lubricating oil composition for a food processing machine, which comprises 1 to 10.0% by weight and (C) 0.01 to 10.0% by weight of a fatty acid having 12 to 22 carbon atoms as an essential component.