JPH1129785A - Fluorosilicone grease - Google Patents

Abstract

(57) [Problem] To provide a fluorosilicone grease whose base oil is composed of a fluorosilicone oil and which has excellent rust prevention performance. SOLUTION: This fluorosilicone grease is characterized by containing the following components (1) to (3). (1) Base oil composed of fluorosilicone oil (2) Thickener composed of fluorine-containing compound (3) Rust inhibitor composed of sorbitan fatty acid ester Sorbitan fatty acid ester which is a rust inhibitor has 1 carbon atom
Esters with 2 to 18 saturated or unsaturated fatty acids are preferred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fluorosilicone grease having excellent rust prevention performance in addition to lubrication performance.

[0002]

2. Description of the Related Art Generally, grease is used to obtain good lubrication performance. However, in practical use, grease is required to have various characteristics other than lubrication performance according to the actual application. In particular, rust prevention performance is often required for greases used in mechanical applications, and various types of grease rust preventives have been developed.
Have been used. However, conventionally, in a fluorosilicone grease in which the base oil is a fluorosilicone oil, there has been a problem that excellent rustproofing performance cannot be obtained even if a rustproofing agent is contained.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fluorosilicone grease in which the base oil is a fluorosilicone oil, and to provide an excellent protection. It is to provide a material having rust performance.

[0004]

The fluorosilicone grease of the present invention is characterized by containing the following components (1) to (3). (1) Base oil composed of fluorosilicone oil (2) Thickener composed of fluorine-containing compound (3) Rust inhibitor composed of sorbitan fatty acid ester Here, sorbitan fatty acid ester which is a rust inhibitor has 12 to 12 carbon atoms. Preferred are esters with 18 saturated or unsaturated fatty acids.

[0005]

The fluorosilicone grease of the present invention has a base oil composed of a fluorosilicone oil, but contains a specific compound called a sorbitan fatty acid ester as a rust preventive, so that the lubricating performance inherent in the base oil can be improved. In addition, the rust preventive exhibits excellent rust prevention performance.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described specifically. The fluorosilicone grease of the present invention is basically composed of a base oil composed of a fluorosilicone oil, a thickener composed of a fluorine-containing compound, and a rust inhibitor composed of a sorbitan fatty acid ester. Various additives can be added to the fluorosilicone grease as needed. Specific examples of the additive include a surfactant, a dye, a pigment, a dispersant, an antioxidant, and others.

In order to produce the fluorosilicone grease of the present invention, a fluorosilicone oil having an appropriate viscosity is used as a base oil, and the base oil and a thickener comprising a fluorine-containing compound have a required consistency. Any of means for forming a grease base and adding and mixing a rust inhibitor to the grease base, and means for obtaining a composition having a required consistency by simultaneously mixing a base oil, a thickener and a rust inhibitor. May be used. In the actual production of grease, it is possible to perform a heat treatment if desired, but in this case, the heating temperature must be lower than the decomposition temperature of the specific compound to be used.

In the present invention, a fluorosilicone oil is used as a base oil. Here, the "fluorosilicone oil" is a fluorosilicone oil having a substituent containing a fluorine atom, and is not particularly limited as long as it has a viscosity within a range usable as a base oil of grease. . The fluorosilicone oil has a viscosity of 100 to 1000 particularly at a temperature of 25 ° C.
What is 00 cSt, preferably 100 to 20,000 cSt is suitably used.

Specific examples of the fluorosilicone oil suitably used in the present invention include those represented by the following formula (1), but are not limited thereto. Furthermore, in such fluorosilicone oil,
Other known grease base oils, e.g., silicones such as perfluoropolyethers, fluorosilicone, methylphenylsilicone, dimethylsilicone, esters, polyethers, synthetic hydrocarbon oils, mineral oils, so long as they do not interfere with the initial object of the present invention. , Vegetable oil and the like may be added and mixed.

[0010]

Embedded image R ¹ : hydrocarbon group having 1 to 3 carbon atoms R ² : methyl group, ethyl group, vinyl group, phenyl group or —CH ₂ CH ₂ R group (R: perfluoroalkyl group having 1 to 10 carbon atoms And at least 5 of R ²
0% is -CH ₂ CH ₂ R group. N is the number of the range giving the above-mentioned viscosity range. Among the fluorosilicone compounds represented by the above formula (1), the following compounds are particularly preferred.

A trifluoropropylmethylpolysiloxane represented by the following formula (2)

Embedded image (M is a number in a range where the viscosity is 100 to 100000 cSt.)

A perfluoroalkylmethylpolysiloxane represented by the following formula (3)

Embedded image (A and b are numbers arbitrarily selected from each other in a range where the viscosity is 100 to 100000 cSt.)

[0013]

Embedded image (N is a number in a range where the viscosity is 100 to 100000 cSt.)

[0014]

Embedded image (M and n are numbers arbitrarily selected from each other within a range where the viscosity is 100 to 100000 cSt.)

[0015]

Embedded image (M and n are numbers arbitrarily selected from each other within a range where the viscosity is 100 to 100000 cSt.)

[0016]

Embedded image (N is a number in a range where the viscosity is 100 to 100000 cSt.)

[0017]

Embedded image (N is a number in a range where the viscosity is 100 to 100000 cSt.)

[0018]

Embedded image (M and n are numbers arbitrarily selected from each other within a range where the viscosity is 100 to 100000 cSt.)

The thickener used in the present invention is not particularly limited as long as it is a compound containing a fluorine atom and exerts a thickening action on the base oil.
Specific examples of the thickener include polytetrafluoroethylene, a copolymer of tetrafluoroethylene and perfluoroalkylvinyl ether (alkyl having 1 to 3 carbon atoms), a copolymer of hexafluoroisobutylene and vinylidene fluoride, Preferred examples include copolymers of fluoroethylene and hexafluoropropene, ethylene trifluoride resin, and others.

In the present invention, as long as the object of the present invention is not hindered, it is possible to use a thickener comprising a fluorine-containing compound together with a thickener other than the fluorine-containing compound. Examples of such thickeners include lithium soap, calcium soap, aluminum soap, their complex soaps, urea, benton, silica and the like.

The rust preventive used in the present invention comprises a sorbitan fatty acid ester. The fatty acid portion of the sorbitan fatty acid ester may be either a saturated fatty acid or an unsaturated fatty acid.
Esters with fatty acids are preferred. Specific examples of the sorbitan fatty acid ester preferably used in the present invention include, for example, sorbitan monododecaate (C ₁₈ H
₃₄ O ₆ ), sorbitan monooctadecanoate (C ₂₄ H
₄₆ O ₆ ), sorbitan mono-9-octadecenoate (C ₂₄ H ₄₄ O ₆ ), sorbitan monohexadecanoate (C ₂₂ H ₄₂ O ₆ ), sorbitan tri-9-octadecenoate (C ₆₀ H ₁₀₈ O ₆ ) and others.

The mixing ratio of each component for obtaining the fluorosilicone grease of the present invention is not particularly limited as long as the finally obtained grease has an appropriate consistency. In addition, the range of the preferable consistency as grease is 220-340 normally.

[0023]

According to the present invention, even when the base oil is made of fluorosilicone oil, extremely excellent rust-preventing performance is obtained by containing a rust-preventive agent consisting of a specific compound called sorbitan fatty acid ester. Can be provided.

[0024]

【Example】

Example 1 A base oil composed of trifluoropropylmethylpolysiloxane having a viscosity of 300 cSt at a temperature of 25 ° C. and capped at both ends by a trimethylsilyl group, and 60% by weight of polytetrafluoroethylene (PTFE) “Fluon L171
J "(manufactured by Asahi Glass Co., Ltd.) and 39% by weight of a thickening agent, and 1% by weight of a rust inhibitor consisting of sorbitan mono-9-octadecenoate which is a sorbitan fatty acid ester having 18 carbon atoms in the fatty acid portion. Thus, a fluorosilicone grease was prepared. This is designated as Sample 1.

Examples 2 to 4 and Comparative Examples 1 to 3 A base oil and a thickener consisting of the same fluorosilicone oil as in Example 1 and various rust preventives are mixed according to the formulations shown in Table 1 below. Thus, a fluorosilicone grease was prepared. These were used for Samples 2 to 4 and Comparative Samples 1 to
3 is assumed. As a rust preventive composed of an aliphatic amine, "Kirestolite T" (manufactured by Kyrest Co.) was used.

EXPERIMENTAL EXAMPLE Vertical length 60 specified in JIS K 2246 5.3.1
Specimen material made of a stainless steel plate having a thickness of 80 mm, a width of 80 mm and a thickness of 1.5 mm was obtained.
6 Specimens were prepared by performing preliminary cleaning, surface polishing and finish cleaning according to the procedure specified in 5.3.2. As shown in FIG. 1, a width of 10 mm along the outer periphery of the test piece 10
The adhesive tape 12 having a thickness of 50 μm is adhered to the outer peripheral region (shown by diagonal lines) to expose the surface of the stainless steel in the central region 14.
Each of the fluorosilicone greases according to Comparative Samples 1 to 3 was applied, and excess grease was scraped off with a scraper to obtain 50 g of the same thickness as the pressure-sensitive adhesive tape 12.
A uniform grease coating film having a thickness of μm was formed.

The test piece thus obtained was subjected to JIS
According to the wetness test method according to K 2246 5.34, the test piece is suspended and held in a wetness apparatus under a humid environment condition of a temperature of 49 ° C. and a relative humidity of 95% or more, and each test piece is observed every one hour after traveling. Then, the elapsed time until rust was generated in the central region 14 was measured. In addition, when the presence of rust was recognized even in one place in the central region 14, it was determined as "generation of rust". The results are as shown in Table 1. In Table 1, the underlined value of the elapsed time indicates that no rust was observed even after the elapsed time.

[0028]

[Table 1]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a test piece used for a rust prevention performance test of a grease sample.

[Explanation of symbols]

 10 Test piece 12 Adhesive tape 14 Central area

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10N 30:12 50:10

Claims (2)

[Claims] 1. A fluorosilicone grease comprising the following components (1) to (3): (1) Base oil composed of fluorosilicone oil (2) Thickener composed of fluorine-containing compound (3) Rust inhibitor composed of sorbitan fatty acid ester 2. The fluorosilicone grease according to claim 1, wherein the rust inhibitor sorbitan fatty acid ester is an ester of a saturated or unsaturated fatty acid having 12 to 18 carbon atoms.