JPH0741789A - Heat-resistant solid lubricant - Google Patents

Abstract

PURPOSE:To obtain a heat-resistant solid lubricant by mixing an ultra- high-molecular-weight polyolefin, a thermosetting resin or its prepolymer, and a lubricating oil or grease at a specified ratio, heating the mixture above a specified temperature and solidifying it. CONSTITUTION:A mixture of 1-50wt.% ultra-high-molecular-weight polyolefin, 50-5wt.% thermosetting resin or prepolymer thereof, and the balance of a lubricating oil or grease is heated at a temperature above the melting point of the polyolefin and then solidified. To be concrete, for example, an intimate mixture of an ultra-high-molecular-weight polyethylene and a phenolic resin prepolymer is well mixed with a grease based on a mineral oil thickened with a lithium soap, and this mixture put in a container is heated at 150 deg.C for 30 min. 5-30wt.% inorganic fibers, such as glass fibers and carbon fibers, or organic fibers, such as aramid fibers, polyester fibers and cotton fibers, can be incorporated into the mixture.

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 solid lubricant having excellent heat resistance.

[0002]

2. Description of the Related Art As a solid lubricant for bearings, conventionally, a mixture of ultra-high molecular weight polyethylene having an average molecular weight of 1 × 10 ^{6 to} 5 × 10 ⁶ and lubricating grease is filled in a space of an object to be lubricated such as a bearing. It is known that this is heated and solidified at a temperature not lower than the melting point of the ultra high molecular weight polyethylene (see Japanese Patent Publication No. 63-23239).

[0003]

The above solid lubricant has the advantage of exhibiting good lubricating performance for a long time without lubrication, but since the raw material resin is polyethylene, the heat resistance temperature is 120 ° C at maximum. is there. Therefore, it cannot be used in applications where the atmosphere in which an object to be lubricated, such as a bearing, is to be used is at or above the above temperature, and there is a problem that the applications are limited.

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

[0005]

In order to solve the above-mentioned problems, the heat-resistant solid lubricant of the present invention comprises 1 to 50% by weight of an ultrahigh molecular weight polyolefin, 50 to 5% by weight of a thermosetting resin or its prepolymer. % And the balance is a mixture of lubricating oil or lubricating grease, which is heated and solidified at a temperature equal to or higher than the melting point of the polyolefin for ultra-high content.

In the above heat-resistant solid lubricant,
It is also possible to use a mixture in which 5 to 30% by weight of inorganic fibers such as glass fibers or carbon fibers or organic fibers such as aramid fibers, polyester and cotton is mixed with the mixture.

1 to 5 of the above ultra high molecular weight polyolefin
The reason for setting it to 0% by weight is that if it is less than 1% by weight, it is difficult to solidify, and if it exceeds 50% by weight, the mixing ratio of lubricating grease or lubricating oil is small and the lubricity is poor.

The reason why the thermosetting resin or its prepolymer is 50 to 5% by weight is that when the amount is more than 50% by weight, the lubricating grease or lubricating oil is mixed in a small proportion, and the lubricity is poor. This is because if it is less than 5% by weight, it becomes difficult to improve the heat resistance.

Further, the reason for setting the inorganic fiber and the organic fiber to 5 to 50% by weight is that the strength of the solid lubricant is difficult to improve when the amount is less than 5% by weight, and the lubricating grease or the lubricating oil is used when the amount exceeds 50% by weight. This is because the mixing ratio of is small and the lubricity is poor.

Examples of the thermosetting resin include phenol resin, urea resin, unsaturated polyester resin, epokin resin and imide resin.

[0011]

The ultrahigh molecular weight polyolefin absorbs the lubricating oil or the lubricating oil in the grease in the space between the swollen polyolefin particles when heated to a temperature above the melting point. The polyolefin particles cannot penetrate between the particles, and the thermosetting resin remaining on the surface is cured by heat to form a continuous network. As a result, a network of polyolefins and a network of thermosetting resins are interdigitated to form a three-dimensional structure.

Even when the solid lubricant is heated above the temperature at which the swollen polyolefin absorbs the lubricating oil and softens and deforms, the hard and heat-resistant network of the thermosetting resin causes the deformation of the solid lubricant. Prevent.

[0013]

【Example】

Example 1 A mixture of 20 parts of ultrahigh molecular weight polyethylene and 10 parts of phenol resin prepolymer is mixed well at room temperature. This mixture is thoroughly mixed with 70 parts of lithium soap thickened mineral oil grease. This is an iron outer diameter φ20mm ×
It was placed in a cylindrical container having an inner diameter of 10 mm, an iron plate was laid on the lower part of this cylinder, and the container was kept in a constant temperature bath set at 150 ° C. for 30 minutes. After cooling to room temperature, it was taken out from the container and the physical properties were measured.

[Examples 2 to 4] The same procedure as in Example 1 was carried out except that the compounding ratio was changed as shown in Table 1.

[0015]

[Table 1]

In the case of each of the above-mentioned examples, 5% of inorganic fiber such as glass fiber or carbon fiber or organic fiber such as araside fiber, polyester or cotton was added to each mixture.
By mixing up to 30%, the strength can be improved.

[0017]

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

Further, since this solid lubricant contains a lubricant, it has the ability to form an oil film even after being solidified by heating,
Demonstrate the lubrication function.

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Claims (2)

[Claims] 1. Ultrahigh molecular weight polyolefin 1 to 50% by weight, thermosetting resin or its prepolymer 50 to 5% by weight
A heat-resistant solid lubricant obtained by heating and solidifying a mixture of lubricating oil or lubricating grease as the balance, at a temperature not lower than the melting point of the ultrahigh molecular weight polyolefin. 2. An inorganic fiber such as glass fiber or carbon fiber or aramid fiber, polyester,
The heat resistant solid lubricant according to claim 1, wherein organic fibers such as cotton are mixed in an amount of 5 to 30% by weight.