JP3263491B2 - Fluorine-based heat-resistant solid lubricant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid lubricant used for bearings and the like, and more particularly to a fluorine-based heat-resistant solid lubricant excellent in heat resistance.

[0002]

2. Description of the Related Art As a solid lubricant for a bearing, a mixture of an ultra-high molecular weight polyolefin (polyethylene) having an average molecular weight of 1 × 10 ^{6 to} 5 × 10 ⁶ and lubricating grease has been conventionally used as a space for lubricating objects such as bearings. And solidified by heating at a temperature equal to or higher than the melting point of the ultrahigh molecular weight polyolefin (polyethylene) (JP-B-63-23).
No. 239).

[0003]

The above-mentioned solid lubricant has the advantage of exhibiting good lubricating performance over a long period of time without lubrication. However, since the raw material resin is a polyolefin (polyethylene), the heat resistance temperature is maximum. 120 ° C. Therefore, it cannot be used in applications where the use atmosphere of the object to be lubricated such as a bearing is higher than the above-mentioned temperature, and there is a problem that the application is limited.

Therefore, an object of the present invention is to improve the heat resistance while maintaining the lubricating performance of the conventional solid lubricant described above.

[0005]

In order to solve the above-mentioned problems, a solid lubricant according to the present invention comprises a fluororesin powder 9
5 to 99% by weight of lubricating grease or lubricating oil is mixed with 5 to 1% by weight and dispersed and held at a temperature equal to or higher than the melting point of the fluororesin.

[0006] Raw material powders of the above fluororesin include polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), perfluoroalkoxy resin (PFA), polychlorotrifluoroethylene (PCTFE), ethylene chlorotriethylene. Fluoroethylene polymer (ECTFE), ethylene tetrafluoroethylene polymer (ETFE), polyvinylidene fluoride (P
VDF).

As the above lubricating grease, there is a grease using fluorine oil, fluorine silicone oil as a base oil and silica, benton, indanthrene, phthalocyanine, fluorine resin or the like as a thickener.

As the above lubricating oil, there are fluorine oil (perfluoropolyether) and fluorine silicone oil.

The method for producing a solid lubricant according to the present invention comprises:
The above-mentioned fluororesin raw material powder and lubricating grease or lubricating oil are mixed well, the mixture is sealed in a space of a lubricating object such as a bearing, and then heated at a temperature equal to or higher than the melting point of the resin and then cooled. , Solidifies.

The reason that the content of the above-mentioned fluororesin is 95 to 1% by weight is that if the content exceeds 95% by weight, the mixing ratio of lubricating grease or lubricating oil becomes extremely small, so that lubricity is inferior and 1% by weight. If the amount is less than 10%, it is difficult to solidify.

[0011]

【Example】

[Example 1] PTFE powder (TFE-KTL manufactured by Kitamura Co., Ltd.)
610) 20 parts and 80 parts of silica-enriched fluoro oil-based grease are mixed well. This is an iron outer diameter φ20mm x inner diameter φ
The container was placed in a 10 mm cylindrical container, an iron plate was laid under the cylinder, and kept in a thermostat set at 340 ° C. for 60 minutes. After cooling to room temperature, it was taken out of the container and the physical properties were measured. The results are shown in Table 1.

[Examples 2 to 7] The same procedures as in Examples were performed except that the mixing ratio was changed as shown in Table 1.

ETFE powder (MFC manufactured by Asahi Glass Co., Ltd.)
-COP-Z8820).

Comparative Example 1 Ultra-high molecular weight polyolefin (PE) 20 parts and lithium soap-enriched mineral oil-based grease 80
And the same experiment as in Example 1 was performed. However, the set temperature of the thermostat is 150 ° C, and the holding period is 30 ° C.
Minutes.

[0015]

[Table 1]

[0016]

The present invention is as described above.
Despite containing a large amount of lubricant in the composition, it is hard and has high strength even at 200 ° C.

Further, since this solid lubricant contains a lubricant, it has an oil film forming ability even after heating and solidifying,
Exhibits a lubrication function.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C10N 30:08 C10N 30:08 40:02 40:02 50:08 50:08 70:00 70:00 (58) Fields surveyed (Int.Cl. ⁷ , DB name) C10M 107/38 C10M 107/00 C10M 107/50 C10M 147/00-147/04 C10N 30:08 C10N 40:02 C10N 50:08 C10N 70:00

Claims (1)

(57) [Claims] (1) a fluororesin powder of 95 to 1% by weight ;
Base oil or fluorosilicone oil or a combination of both
A fluorine-based heat-resistant solid lubricant obtained by mixing lubricating oil or 5 to 99 % by weight of lubricating grease using the lubricating oil as a base oil, and dispersing and maintaining the mixture at a temperature equal to or higher than the melting point of the fluororesin.