CN107406792A - grease composition - Google Patents

Abstract

The invention provides a grease composition which has good low-temperature characteristics and can inhibit the use of the grease composition especially at high temperatureDeterioration of the polyamide resin member in the environment hardly reduces the elongation at break and can be maintained at a high level. The grease composition for polyamide resin parts of the present invention is supplied as a lubricant to at least the surface of a sliding part of a polyamide resin part having the sliding part sliding with another part, and is characterized by comprising a base oil and a thickener, wherein the base oil is a synthetic hydrocarbon oil, the thickener is at least one metal complex soap selected from a barium complex soap and a lithium complex soap, and the base oil has a kinematic viscosity at 40 ℃ of 30 to 200mm²The dropping point of the thickener is 270 ℃ or higher.

Description

grease composition

technical field

The present invention relates to a grease composition for polyamide resin parts that is supplied and used as a lubricant on at least the surface of a sliding part of a polyamide resin part having a sliding part, such as a resin part or a metal material. Other parts slide, or slide on other parts.

Background technique

Conventionally, greases have been used as lubricant compositions in various industrial fields such as iron and steel, automobiles, general machinery, and precision machinery. In recent years, polyamide resins are often used to improve heat resistance in parts such as sliding parts of automobile parts, in addition to weight reduction and cost reduction, as well as use in high-temperature environments.

Grease used for sliding parts of polyamide resin components needs to have properties not to degrade (brittle) the polyamide resin components in addition to lubricity, low-temperature properties, and heat resistance. However, when the commonly used lithium soap grease or urea grease is used as the grease for polyamide resin parts, there is a tendency to cause the following problems: The aggressiveness of the polyamide resin parts used under this condition will degrade the polyamide resin parts, resulting in impaired performance of polyamide resin machine parts. That is, lithium-based grease tends to deteriorate polyamide resin parts due to oxidation. In addition, as for urea grease, although urea grease itself has high heat resistance, if the resin is processed under the above-mentioned high-temperature environment When dipping, there is a tendency that a part of the amine in the urea is released, and the released amine exhibits aggressiveness to the polyamide resin part, thereby deteriorating the polyamide resin.

For example, Patent Document 1 describes a lubricant composition containing synthetic hydrocarbon oil, a urea-based thickener, and zinc stearate in order to suppress deterioration of polyamide resin parts in a high-temperature (140°C in Example) environment. , further containing at least one compound selected from the group consisting of trimellitate, aromatic sulfonamide, phthalate and hindered phenol.

However, the lubricant composition containing a urea-based thickener described in Patent Document 1 has a problem that, as described above, it exhibits aggressiveness against polyamide resin parts in a high-temperature environment and causes polyamide resin parts to Deterioration, thereby reducing the performance of mechanical parts made of polyamide resin, especially the elongation at break.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2012-102191

Contents of the invention

The problem to be solved by the invention

Therefore, an object of the present invention is to provide a grease composition for polyamide resin parts, which has good low-temperature characteristics by optimizing the base oil and thickener, and can suppress polyamide resin grease composition especially in high-temperature use environments. Deterioration of amide resin parts hardly lowers the elongation at break and can maintain it at a high level.

means to solve the problem

In order to solve the above-mentioned problems, the main configuration of the present invention is as follows.

(1) A grease composition for polyamide resin parts, which is supplied and used as a lubricant on at least the surface of the sliding part of a polyamide resin part having a sliding part that slides with other parts, characterized in that it contains : Base oil and thickener, the base oil is a synthetic hydrocarbon oil, the thickener is at least one metal complex soap in barium complex soap and lithium complex soap, and the kinematic viscosity of the above-mentioned base oil at 40°C is 30～ In the range of 200mm ² /s, the dropping point of the thickener is 270°C or higher.

(2) The grease composition for polyamide resin parts according to (1) above, wherein the base oil is a single oil of poly-α-olefin, or a copolymer of poly-α-olefin and ethylene-α-olefin of mixed oils.

(3) The grease composition for polyamide resin parts according to (1) or (2) above, wherein the other part is a metal part.

The effect of the invention

According to the present invention, the following grease composition for polyamide resin parts can be provided, which contains a base oil and a thickener, the base oil is a synthetic hydrocarbon oil, and the thickener is at least one of barium complex soap and lithium complex soap or metal complex soap, and the kinematic viscosity of the base oil at 40°C is in the range of 30 to 200mm ² /s, and the dropping point of the thickener is 270°C or higher, so that the grease composition for polyamide resin parts has Good low-temperature properties can suppress the deterioration of polyamide resin parts especially in high-temperature use environments, and can hardly reduce the elongation at break and can maintain it at a high level.

detailed description

Next, embodiments of the present invention will be described below.

The grease composition for polyamide resin parts of the present invention is supplied and used as a lubricant on at least the surface of the sliding part of a polyamide resin part having a sliding part that slides with other parts, and has both good low-temperature properties and particularly Both excellent mechanical properties (particularly elongation at break) in a high-temperature use environment.

As another member, a resin material or a metal material is mentioned, for example. The resin material may be a resin material having the same composition as that of the polyamide resin component, or may be a resin material having a composition different therefrom. In addition, when other parts are metal parts, it is preferable to use the grease composition of this invention as a lubricant on the surface of a polyamide resin part, since a particularly remarkable effect is achieved.

Here, the "high temperature (use) environment" refers to an environment in which the atmospheric temperature is in the range of 130 to 150°C.

The grease composition of the present invention contains a base oil and a thickener.

(base oil)

In the present invention, the base oil is a synthetic hydrocarbon oil, and it is essential that the kinematic viscosity of the base oil at 40° C. is in the range of 30 to 200 mm ² /s. This is because if the kinematic viscosity of synthetic hydrocarbon oil at 40°C is lower than 30 mm ² /s, the deterioration of polyamide resin parts will be accelerated, and if it is higher than 200 mm ² /s, the torque at low temperature (low temperature torque) increases. In addition, when using a base oil other than a synthetic hydrocarbon oil, such as an ester-based synthetic oil or an ether-based synthetic oil, since it may adversely affect resin parts, it is preferable to use only a synthetic hydrocarbon oil. Make up base oil. Examples of synthetic hydrocarbon oils include poly-α-olefins, ethylene-α-olefin copolymers, and polybutene. As a specific example of the base oil composed of synthetic hydrocarbon oil, the case where a single oil composed of poly-α-olefin is used as the base oil, or a mixed oil of poly-α-olefin and ethylene-α-olefin copolymer is particularly preferably mentioned. As a base oil situation.

In the present invention, poly-α-olefin refers to a polymer formed by homopolymerizing or copolymerizing monomers composed of one or two or more α-olefins having 3 or more carbon atoms.

Here, the α-olefin is not particularly limited, but preferably a linear terminal olefin having 3 to 30 carbons, more preferably a linear terminal olefin having 4 to 20 carbons, and still more preferably A linear terminal olefin with a carbon number of 6 to 16. More specifically, propylene, 1-butene, 1-pentene, 1-hexene, etc. are mentioned.

The compounding ratio of poly-α-olefin to the whole grease composition is preferably in the range of 67 to 91% by mass. In addition, when the synthetic hydrocarbon oil is a mixed oil of poly-α-olefin and ethylene-α-olefin copolymer, it is preferable that the proportion of poly-α-olefin relative to the entire grease composition is 69 to 86% by mass. scope.

In addition, the degree of polymerization of the poly-α-olefin is not particularly limited, and what is generally called an oligomer is also included. In addition, one type of poly-α-olefin may be used alone, or two or more types of poly-α-olefin may be used in combination.

In the present invention, the ethylene-α-olefin copolymer refers to a copolymer comprising ethylene and one or two or more α-olefins having 3 or more carbon atoms as constituent monomers.

Here, the α-olefin in the ethylene-α-olefin copolymer is not particularly limited, but linear terminal olefins having 3 to 30 carbon atoms are preferred, and linear terminal olefins having 4 to 20 carbon atoms are more preferred. The chain terminal olefin is more preferably a linear terminal olefin having 6 to 16 carbon atoms. More specifically, propylene, 1-butene, 1-pentene, 1-hexene, etc. are mentioned. In addition, one type of poly-α-olefin may be used alone, or two or more types of poly-α-olefin may be used. In addition, the ethylene-α-olefin copolymer may have any structure of a random copolymer, an alternating copolymer, a periodic copolymer, and a block copolymer.

The number average molecular weight of the ethylene-α-olefin copolymer is in the range of 40,000 to 200,000, and the weight average molecular weight is in the range of 40,000 to 200,000.

When the synthetic hydrocarbon oil is a mixed oil of poly-α-olefin and ethylene-α-olefin copolymer, it is preferable that the ratio of ethylene-α-olefin copolymer to the whole grease composition is 1.5 to 3.5% by mass. scope. If the proportion of the ethylene-α-olefin copolymer is less than 1.5% by mass, the base oil viscosity may not be raised to a desired value within the appropriate range, and if it exceeds 3.5% by mass, the base oil viscosity may not be within the appropriate range. become too high in comparison.

(thickener)

In the grease composition of the present invention, the thickener needs to be limited to at least one metal complex soap of lithium complex soap and barium complex soap from the viewpoint of high heat resistance and not deteriorating the polyamide resin. In addition, from the viewpoint of suppressing the deterioration of the polyamide resin parts of the grease composition in a high-temperature environment (during high-temperature durability) and maintaining a high elongation at break of the polyamide resin parts, it is necessary to add drops of the thickener to The point limit is above 270°C. When the dropping point of the thickener is less than 270° C., the grease composition may attack polyamide resin components during high-temperature durability, thereby deteriorating them.

Here, lithium complex soap refers to a soap obtained by saponifying various carboxylic acids or esters with lithium hydroxide. In addition, barium complex soap is a soap obtained by saponifying various carboxylic acids or esters with barium hydroxide.

Specific examples of lithium complex soaps or barium complex soaps include fatty acids such as stearic acid, oleic acid, and palmitic acid and/or hydroxy fatty acids with 12 to 24 carbon atoms having one or more hydroxyl groups in the molecule, and at least one selected from aromatic carboxylic acids, aliphatic dicarboxylic acids with a carbon number of 2 to 20 (more preferably, a carbon number of 4 to 12), and carboxylic acid monoamides with lithium compounds such as lithium hydroxide or hydrogen A substance obtained by reacting a barium compound such as barium oxide.

The above-mentioned hydroxy fatty acid having 12 to 24 carbon atoms is not particularly limited, and examples thereof include 12-hydroxystearic acid, 12-hydroxylauric acid, and 16-hydroxypalmitic acid. - Hydroxystearic acid.

Examples of the aromatic carboxylic acid include benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, salicylic acid, and p-hydroxybenzoic acid.

In addition, the above-mentioned aliphatic dicarboxylic acid having 2 to 20 carbon atoms is not particularly limited, and examples thereof include oxalic acid, malonic acid, succinic acid, methylsuccinic acid, glutaric acid, adipic acid, pimelic acid, and Acid, Suberic Acid, Azelaic Acid, Sebacic Acid, Nonanedicarboxylic Acid, Decanedicarboxylic Acid, Undecanedicarboxylic Acid, Dodecanedicarboxylic Acid, Tridecanedicarboxylic Acid, Tetradecane Dicarboxylic acid, pentadecanedicarboxylic acid, hexadecanedicarboxylic acid, heptadecanedicarboxylic acid, octadecanedicarboxylic acid, etc., preferably adipic acid, pimelic acid, suberic acid, azelaic acid , sebacic acid, nonane dicarboxylic acid, decane dicarboxylic acid, undecane dicarboxylic acid, dodecane dicarboxylic acid, tridecane dicarboxylic acid, tetradecane dicarboxylic acid, pentadecane dicarboxylic acid acid, hexadecane dicarboxylic acid, heptadecane dicarboxylic acid, octadecane dicarboxylic acid, etc. Among the above-mentioned substances, azelaic acid and sebacic acid are preferable.

In addition, examples of the carboxylic acid monoamide include amidated one carboxyl group of the dicarboxylic acid described above. Preferable carboxylic acid monoamides include those obtained by amidating one carboxyl group of azelaic acid or sebacic acid.

Examples of amidated amines include butylamine, pentylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, octadecylamine, eicosylamine, Aliphatic primary amines such as diamine; dipropylamine, diisopropylamine, dibutylamine, diamylamine, dilaurylamine, monomethyllaurylamine, distearylamine, monomethylstearylamine, Aliphatic secondary amines such as myristylamine and dipalmitylamine; aliphatic unsaturated amines such as allylamine, diallylamine, oleylamine, and dioleylamine; cyclopropylamine, cyclobutylamine, cyclopentylamine, cyclopentylamine, etc. Alicyclic amines such as hexylamine; aromatic amines such as aniline, methylaniline, ethylaniline, benzylamine, dibenzylamine, diphenylamine, α-naphthylamine, etc., preferably hexylamine, heptylamine, Octylamine, nonylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, octadecylamine, behenylamine, dibutylamine, dipentylamine, monomethyldodecylamine, monomethyl Octadecylamine, oleylamine, etc.

When compounding a lithium complex soap or a barium complex soap, it can be compounded by adding a carboxylic acid and/or its ester and the above-mentioned metal hydroxide to a base oil and saponifying them in the base oil.

When preparing lithium complex soap or barium complex soap by saponification in base oil, for example, as carboxylic acid, stearic acid and/or 12-hydroxystearic acid in combination with azelaic acid or sebacic acid is preferably used Wait.

In addition, when carrying out saponification reaction in a base oil, multiple types of carboxylic acids and/or their esters, and acid amides may be saponified simultaneously, or they may be saponified sequentially.

When the thickener is a lithium complex soap, the compounding ratio is preferably 8 to 18% by mass relative to the entire grease composition. If the compounding amount is less than 8% by mass, the oil release degree may increase to reduce the storage stability of the grease composition, and if it exceeds 18% by mass, the low-temperature torque at low temperature may increase.

When the thickener is barium complex soap, it is preferable that the compounding ratio with respect to the whole grease composition is 27-33 mass %. If the compounding amount is less than 27% by mass, the oil separation degree may increase to reduce the storage stability of the grease composition, and if it exceeds 33% by mass, the low temperature torque at low temperature may decrease.

(other)

In the grease composition, antioxidants, antirust agents, extreme pressure agents, oiliness agents, viscosity agents, and Index enhancer and other additives.

Examples of antioxidants include phenolic antioxidants such as 2,6-di-tert-butyl-4-methylphenol and 4,4'-methylene bis(2,6-di-tert-butylphenol); Amine-based antioxidants such as alkyldiphenylamine, triphenylamine, phenyl-α-naphthylamine, phenothiazine, alkylated phenyl-α-naphthylamine, alkylated phenothiazine, etc. . In addition, phosphorus-based antioxidants, sulfur-based antioxidants, and the like are also used.

As the antirust agent, for example, Ca salt or Na salt of aromatic sulfonic acid or saturated aliphatic dicarboxylic acid, fatty acid, fatty acid amine, alkylsulfonic acid metal salt, alkylsulfonic acid amine salt, oxidized paraffin, poly Oxyalkyl ethers, etc.

As extreme pressure agents, for example, phosphorous compounds such as phosphoric acid esters, phosphorous acid esters, and phosphoric acid ester amine salts; sulfur compounds such as sulfides and disulfides; dialkyl dithiophosphoric acid metal salts (excluding Zinc salt), metal salts of sulfur compounds such as dialkyl dithiocarbamate metal salts; chlorinated paraffin, chlorinated biphenyl and other chlorine compounds, molybdenum dialkyl dithiocarbamate (MoDTP) and other organic metal compounds Wait.

Examples of oily agents include fatty acids or esters thereof, higher alcohols, polyhydric alcohols or esters thereof, aliphatic esters, aliphatic amines, monoglycerin fatty acid esters, montan waxes, amide waxes, and the like.

Examples of the viscosity index improver include polymethacrylate, ethylene-propylene copolymer, polyisobutylene, polyalkylstyrene, styrene-isoprene hydrogenated copolymer, and the like.

The composition is prepared by a method such as adding predetermined amounts of the above-mentioned components and sufficiently kneading them with triple rolls or a high-pressure homogenizer.

Example

Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these Examples.

(Examples 1-7 and Comparative Examples 1-6)

(1) Preparation method of grease composition

The preparation method of the grease composition was carried out by the following method.

(1-1) When using lithium complex soap (Li-Comp) as a thickener

First, mix a predetermined amount of base oil, 12-hydroxystearic acid (thickener component) and lithium hydroxide (thickener component) in a mixing tank, and heat and stir at a temperature of about 80 to 130°C. saponification reaction. Further mix a specified amount of azelaic acid (thickener component) and heat and stir at a temperature of about 80-200°C, further add lithium hydroxide (thickener component) to it for saponification reaction, and then cool to form a condensate. gelatinous substance. Add various additives and stir in the gel-like substance of this generation, then make it pass through from roller mill or high-pressure homogenizer, thus prepare compounding amount (mass) shown in table 1 and table 2 %) and a grease composition containing the components shown below. For the saponification reaction, it was set to 1 hour or more for the grease composition containing thickener A, and less than 30 minutes for the grease composition containing thickener E. In addition, with respect to the amount of each component which comprises thickener A and E to mix, 12-hydroxystearic acid is 63.5 mass %, and azelaic acid is 19 mass % with respect to the total amount of thickener. , Lithium hydroxide was 17.5% by mass.

(1-2) When barium complex soap (Ba-Comp) is used as a thickener

First, mix a predetermined amount of base oil, sebacic acid (thickener component) and carboxylic acid monostearamide (thickener component) in a mixing tank, heat and stir at a temperature of about 80-200°C, and add Barium hydroxide (thickener component) was added to this to perform saponification reaction, and then cooled to produce a gel-like substance. Add various additives and stir in the gel-like substance of this generation, then make it pass through from roller mill or high-pressure homogenizer, thus prepare compounding amount (mass) shown in table 1 and table 2 %) and a grease composition containing the components shown below. The saponification reaction was set to 30 minutes or more for the grease composition containing the thickener B, and less than 15 minutes for the grease composition containing the thickener F. In addition, the amounts of the components constituting the thickeners B and F to be blended are 27.5% by mass of sebacic acid and 41.5% by mass of carboxylic acid monostearamide with respect to the total amount of the thickeners. , Barium hydroxide was 31% by mass.

(1-3) When using lithium soap (Li-OHST) as a thickener

First, mix a predetermined amount of base oil, 12-hydroxystearic acid (thickener component) and lithium hydroxide (thickener component) in a mixing tank, and heat and stir at a temperature of about 80 to 130°C. saponification reaction. Furthermore, after heating and stirring to melting temperature, it cools and produces|generates a gel-like substance. Various additives were added to the resulting gel-like substance, stirred, and then passed through a roll mill or a high-pressure homogenizer, thereby preparing a compound with the compounding amount (mass %) shown in Table 2. A grease composition containing the components shown below. In addition, with respect to the amount of each component which comprises thickener C to mix|blend, 12-hydroxystearic acid was 88 mass %, and lithium hydroxide was 12 mass % with respect to the total amount of thickener.

(1-4) When using urea (Urea) as a thickener

First, the base oil, diphenylmethane diisocyanate (thickener component), and octylamine (thickener component) are heated and stirred at a temperature of 70 to 180°C to react, the temperature is raised, and the gel is formed after cooling shape substance. Various additives were added to the resulting gel-like substance, stirred, and then passed through a roll mill or a high-pressure homogenizer, thereby preparing a compound with the compounding amount (mass %) shown in Table 2. A grease composition containing the components shown below. In addition, with respect to the amount of each component which comprises the thickener D to mix|blend, diphenylmethane diisocyanate was 50 mass %, and octylamine was 50 mass % with respect to the total amount of thickener.

Poly-α-olefin A: kinematic viscosity at 40°C is 30 mm ² /s (DURASYN 166 manufactured by INEOS Oligomers Japan Company)

Poly-α-olefin B: kinematic viscosity at 40°C is 46 mm ² /s (DURASYN168 manufactured by INEOS Oligomers Japan Company)

Poly-α-olefin C: kinematic viscosity at 40°C 5 mm ² /s (DURASYN162 manufactured by INEOS Oligomers Japan Company)

Poly-α-olefin D: Kinematic viscosity at 40°C is 400 mm ² /s (DURASYN 174 manufactured by INEOS Oligomers Japan Company)

Ethylene-α-olefin copolymer: number average molecular weight 68000, weight average molecular weight 147000 (L6Z-25 manufactured by Showa Varnish Co., Ltd.)

Thickener A: Li-Comp (lithium complex soap) with a dropping point of 280°C

Thickener B: Ba-Comp (barium complex soap) with a dropping point of 270°C

Thickener C: Li-OHST (lithium soap) with a dropping point of 200°C

Thickener D: Urea (urea) with a dropping point of 270°C

Thickener E: Li-Comp (lithium complex soap) with a dropping point of 255°C

Thickener F: Ba-Comp (barium complex soap) with a dropping point of 230°C

Antioxidant: phenylnaphthylamine (VANLUBE 81 manufactured by Sanyo Chemical Industry Co., Ltd.)

Antirust agent: neutral calcium sulfonate (NA SUL CA 1089 manufactured by KING Co., Ltd.)

(2) Evaluation method

(2-1) Base oil viscosity

The base oil viscosity was measured based on JIS K2283:2000.

(2-2) Mixed consistency

The mixing consistency was measured based on JIS K2220.7:2013.

(2-3) Dropping point

The dropping point was measured based on JIS K2220.8:2013.

(2-4) Low temperature characteristics (low temperature torque)

Based on JIS K2220.18:2013, the maximum torque (starting torque) obtained at the time of cranking at -40°C was measured. In the present invention, when the numerical value (exponent) of the starting torque is 27 or less, it is regarded as a pass level, and when it exceeds 27, it is regarded as an unacceptable level.

(2-5) Compatibility of resin and grease composition (elongation at break) under high-temperature service environment

Use nylon 66 (registered trademark) as a test piece specified in JIS K7162:1994, apply grease to the surface with a thickness of about 1mm, put it in a constant temperature bath at 150°C and let it stand for 500 hours. After wiping off the agent, perform the tensile test specified in JIS K7162 (Plastic-Test methods for tensile properties-Part 1: General rules), and measure the elongation at break. In the present invention, a case where the elongation at break was 30% or more was set as a pass level, and a case where it was less than 30% was set as a failure.

(3) Evaluation results

Tables 1 and 2 show the evaluation results of low-temperature characteristics (low-temperature torque) and high-temperature characteristics (elongation at break) of each grease composition applied to polyamide resin components.

Table 1

Table 2

(Note) The underlined numerical values in Table 2 indicate that they are outside the proper range of the present invention and that the performance does not reach the acceptable level.

According to the evaluation results shown in Table 1, it can be seen that in Examples 1 to 7, the starting torque at -40°C is 13 to 27, which are all maintained in a relatively low state. In addition, the elongation at break is also as high as 30 to 27. 43%, the compatibility of polyamide resin parts and grease compositions is also good.

On the other hand, from the evaluation results shown in Table 2, in Comparative Examples 1 to 6, none of the values of the starting torque at -40°C and the elongation at break was at the acceptable level.

Industrial availability

According to the present invention, it is possible to provide a grease composition for polyamide resin parts, which has good low-temperature characteristics, can suppress deterioration of polyamide resin parts in a high-temperature use environment, and hardly lowers the elongation at break and be able to maintain it at a high level. The grease composition of the present invention is suitable for use in sliding parts constituting various mechanical parts such as automobiles, machinery, electrical and electronic equipment, etc., using resin materials such as polyamide resins. Specifically, in automobiles, rolling bearings and sliding bearings that require lubricity in automotive parts such as electric radiator fan motors, fan couplers, electronically controlled EGR, electronically controlled throttle valves, alternators, and electric power steering devices can be mentioned. Bearings, gears, and cams.

Claims (3)

1. a kind of polyamide part lubricant composition, it is in the polyamide with the sliding part slided with miscellaneous part The surface of at least described sliding part of resin component is supplied to use as lubricant,

The polyamide part lubricant composition is characterised by,

Containing base oil and thickener, the base oil is synthetic hydrocarbon oil, and the thickener is in barium compound soap and lithium compound soap At least one metal complex soaps, kinematic viscosity of the base oil at 40 DEG C is 30~200mm²/ s scope, the increasing Thick dose of dropping point is more than 270 DEG C.

2. polyamide part lubricant composition according to claim 1, it is characterised in that

The base oil is the single oil or the miscella of the poly-alpha-olefin and ethene-alpha-olefin copolymer of poly-alpha-olefin.

3. polyamide part lubricant composition according to claim 1 or 2, it is characterised in that

The miscellaneous part is metal parts.