JPH1112587A - Lubricant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lubricant having extremely small dispersing property of oil content and capable of preventing trouble without causing oil separation even when used for precision machinery components for long period by using a specific nondiffusible property-providing agent in lubricating oil or grease. SOLUTION: This lubricant contains (B) 0.1-20 wt.% fluorine-containing compound having a polyoxyalkylene chain consisting essentially of oxyethylene group and two or more polyfluoroalkyl groups in (A) lubricating oil or grease. The component B is preferably a compound having polyfluoroalkyl group at the end through polyoxyalkylene chain. The lubricating agent can be obtained by kneading, e.g. each component by a batch type kneader, etc., e.g. Banbury mixer or roll. Thereby, the lubricant can suitably be used in fields of electric contact parts, etc., in helicoid parts of cameras, phonographic equipment, etc., without using fluorine-based solvent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant, and more particularly, to a lubricant containing a specific non-diffusibility-imparting agent in which a contained oil component is difficult to diffuse.

[0002]

2. Description of the Related Art Various lubricants are used for lubricating various parts of a precision device such as a camera and an OA device, and for improving electric contacts and feelings. Along with automation, lubricants used for these parts are required to have low temperature and low torque, so low-viscosity synthetic oils are mainly used as base oils.

[0003] Accordingly, the oil component is easily separated from the lubricant after a long-term use, which causes various problems. That is, the separated oil component flows out to a portion other than the portion intended for lubrication or the like, and contaminates other components of the precision instrument, for example, the inner surface of the lens, or adheres to the electrical contact components, causing contact failure. As a means to solve such problems,
In order to prevent oil contamination, a solution prepared by dissolving a fluorine-based polymer in a fluorine-based solvent is applied in advance to an anti-contamination site, or a component that may be contaminated is immersed in the solution. This is because the fluorine-based polymer forms a film after the fluorine-based solvent has volatilized, and the oil component causing the contamination can be prevented at that portion.

However, in recent years, the use of CFC-based solvents has caused a great environmental problem since the ozone layer has been destroyed, and measures have been taken to prohibit the use. Until now, useful solvents that can be substituted for CFC-based solvents have not been developed yet, and because the fluorine-based polymer has a very high viscosity, it must be dissolved and diluted in a solvent when applied to form a thin film. Since it needs to be used, it has been highlighted as a major problem that cannot be solved as it is.

Therefore, instead of using a fluoropolymer, a fluorosurfactant is used, and as a means for diluting, a solvent soluble in water such as water or alcohol is used without using a conventional fluorocarbon solvent. In addition, there has been proposed a grease diffusion preventing method and a grease diffusion preventing agent which can cope with the environmental problem of depletion of the ozone layer and have no danger of toxicity or inflammation to the human body (JP-A-4-224896). But,
In this method, there is a problem in terms of work efficiency because a work step of applying a diffusion inhibitor to parts for preventing contamination and drying the work is required. Further, for the purpose of providing non-diffusibility to the lubricant itself, a non-diffusing composition in which a fluorine-based silane compound or a fluorine-based silane compound and a fluorine-based surfactant are contained in a lubricating oil or grease has also been proposed. (JP-A-5-78682). This non-diffusion composition is excellent in preventing diffusion, but has a problem in terms of material cost and economy because a plurality of diffusion inhibitors are used.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned problems of the prior art, and has as its object to use a fluorine-based solvent which causes environmental problems. Another object of the present invention is to provide a lubricant in which excellent non-diffusion is imparted to a lubricant itself by using a specific non-diffusibility imparting agent from the viewpoint of improving work efficiency.

That is, the present invention relates to a method for producing a lubricating oil or grease comprising 0.1 to 20% by mass of a fluorine-containing compound having a polyoxyalkylene chain having an oxyethylene group as a main component and two or more polyfluoroalkyl groups. A lubricant characterized by being contained. "

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. (1) Ingredients Lubricating oil or grease Lubricating oils include refined mineral oils and synthetic hydrocarbon oils. In the case of refined mineral oils, the main raw material is residual oil from atmospheric distillation of crude oil. It is obtained by purifying oil having a boiling point of 300 ° C. or higher obtained by distilling the oil under reduced pressure.

On the other hand, in the case of grease, the above-mentioned refined mineral oil or synthetic hydrocarbon oil is used as a base oil, and as a thickener, a metal soap-based thickener such as lithium soap, which is a fatty acid salt of lithium, or a urea-based thickener is used. And those produced by kneading a non-soap-based thickener such as an organic bentonite.

The fluorine-containing compound used as the non-diffusibility imparting agent is a fluorine-containing compound having a polyoxyalkylene chain having an oxyethylene group as a main component and two or more polyfluoroalkyl groups. Compounds having a polyfluoroalkyl group at the end via a chain are preferred.

The polyoxyalkylene chain contains 2 to 30 moles, preferably 5 to 15 moles of oxyethylene groups,
Other oxyalkylene groups such as oxypropylene group, oxybutylene group, oxyphenylene group, etc.
It contains 0 mol, preferably 0 to 5 mol. It is preferable in terms of performance that the number of moles of the oxyethylene group be larger than the number of moles of the other oxyalkylene groups, and a polyoxyalkylene chain having only the oxyethylene group is particularly preferable. When oxyethylene groups and other oxyalkylene groups are used in combination, they may be bonded in blocks or in random.

As a method for producing a compound having a polyfluoroalkyl group at a terminal via a polyoxyalkylene chain, a method of reacting a compound having a polyoxyalkylene chain with a compound having a polyfluoroalkyl group is preferable. Examples of the compound having a polyoxyalkylene chain include a polyoxyalkylene polyol, a polyoxyalkylene polyamine, and a reaction derivative thereof.

The polyfluoroalkyl group preferably has the following structure.

[0014]

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[1 is an integer of 2 to 19]

[0016]

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[M is an integer of 0 to 17]

[0018]

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[N is an integer of 2 to 19]

As the polyfluoroalkyl group in the present invention, in addition to the above-mentioned polyfluoroalkyl group, CF ₂ ＣC
A branched polyfluoroalkyl group synthesized by oligomerization of F ₂ , CF ₃ CF = CF ₂ , C ₃
F ₇ O (C ₂ F ₄ O) _k CO [k is an integer of 0 to 5] and the like are also included.

As such fluorine-containing compounds, "Surflon KH-40" (trade name) manufactured by Asahi Glass Co., Ltd. and "Unidyne DS-401" manufactured by Daikin Industries, Ltd. are commercially available as perfluoroalkyl group-containing ethylene oxide adducts. I have.

Further, compounds of the following chemical formulas are also exemplified.

[0023]

Embedded image

[N is an integer of 8 to 10. ]

The lubricant according to the present invention contains the above-mentioned fluorine-containing compound in an amount of 0.1 to 20% by mass, preferably 0.2 to 5% by mass.
% By mass. If the amount is less than 0.1% by mass, the separation of the oil component in the lubricant tends to increase, whereas if it exceeds 20% by mass, the consistency is too large and the separation of the oil component tends to increase.

The lubricant according to the present invention may contain other components such as an antioxidant, an extreme pressure additive, and a solid lubricant such as molybdenum disulfide as long as the effects of the present invention are not impaired. .

(2) Production of lubricant The lubricant of the present invention is kneaded with a single-screw extruder or a twin-screw extruder, for example, in addition to a batch-type kneader such as a Banbury mixer, a roll, and a Brabender plastograph. Can be obtained.

[0028]

Next, for the purpose of clarifying the superiority of the present invention, specific examples will be shown and proved. (1) Test Method Tests on the effects of the lubricants shown in the examples and comparative examples were performed as follows. As shown in FIG. 1, a ground glass plate (10c
m × 10 cm) is placed horizontally, and 0.05 ml of the lubricant is collected by a syringe and applied to the center of a ground glass plate. Then, after being left in a constant temperature bath at 25 ° C. for 24 hours, the width at which the oil component diffused and the ground glass became translucent was m
It was measured in m units. The test results are shown in Tables 1 to 4.

(2) Components used Synthetic hydrocarbon oil A: Poly α-olefin oligomer (viscosity 4 mm ² / s {4 cst} at 100 ° C.) Synthetic hydrocarbon oil B: Poly α-olefin oligomer (viscosity at 100 ° C.) 6 mm ² / s {6 cst}) Synthetic hydrocarbon oil C: poly-α-olefin oligomer (viscosity 40 mm ² / s {40 cst} at 100 ° C)

Grease D: Synthetic hydrocarbon oil B was used as a base oil, and 9 mass% of lithium hydroxystearate as a thickener was added thereto. No. 1 grease. Grease E: Synthetic hydrocarbon oil A was used as a base oil, and lithium stearate as a thickener was contained at 11% by mass. No. 1 grease. Grease F: Synthetic hydrocarbon oil A was used as a base oil, and aluminum composite soap as a thickener was contained at 10% by mass. No. 1 grease.

Fluorinated compound A Perfluoroalkyl group-containing ethylene oxide adduct:
"Unidyne DS-401" (trade name) manufactured by Daikin Industries, Ltd. Fluorine-containing compound B A compound represented by the chemical formula [IV].

[0032]

[Table 1]

[0033]

[Table 2]

[0034]

[Table 3]

[0035]

[Table 4]

As shown in Tables 1 to 3, the lubricant containing the fluorine-containing compound A or B does not have a diffusion width (Examples 1, 2, 7, 8, 9, 14) or has a diffusion width. Very little (Examples 3, 4, 5, 6, 10, 11, 1)
2, 13). Fluorine-containing compound A shown in Table 4
Alternatively, the lubricant containing no B (Comparative Examples 1, 2, and 3) has remarkable diffusion of the oil component.

[0037]

The lubricant according to the present invention has a very low oil diffusivity. Therefore, even if this lubricant is used for precision equipment parts for a long period of time, oil separation does not occur and oil does not leak out and contaminate other parts, so troubles can be prevented beforehand and product performance can be prevented. There is no reduction. Therefore, it can be suitably used in the field of precision equipment parts, especially helicoid parts of cameras and electric contact parts in audio equipment.

[Brief description of the drawings]

FIG. 1 is a plan view showing a diffusion state of an oil component of a lubricant on a ground glass surface.

[Explanation of symbols]

 1 ground glass plate 2 lubricant 3 diffusion width

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[Procedure amendment]

[Submission date] July 11, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

Means for Solving the Problems That is, the present invention is,
"The lubricating oil or grease contains 0.1 to 20% by mass of a fluorine-containing compound having a polyoxyalkylene chain having an oxyethylene group as a main component and two or more polyfluoroalkyl groups. Lubricants. "

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10N 40:14 50:10

Claims (1)

[Claims] 1. A lubricating oil or grease containing a fluorine-containing compound having a polyoxyalkylene chain having an oxyethylene group as a main component and two or more polyfluoroalkyl groups.
A lubricant characterized by containing 1 to 20% by mass.