JPH01108262A - Oil-containing resin composition for sliding - Google Patents

Abstract

PURPOSE:To make it possible to form an oil-containing resin composition for sliding from which the lubricating oil can be easily transferred to an interface of sliding, by using a hollow organic fiber as an oil-holding material and adding this fiber containing a lubricating oil to a synthetic resin base. CONSTITUTION:This oil-containing resin composition is formed by adding a hollow organic fiber containing a lubricating oil to a synthetic resin base. Examples of said synthetic resin base include thermoplastic resins, thermosetting resins and elastomers, among which high-density polyethylene, polyamide and polyacetal are desirable. Examples of said fiber include hollow viscose rayon and hollow fibers of nylon and polyester. The length of these fibers can be suitably determined according to the molding process by which the oil-containing resin composition is molded. The ratio of the lubricating oil to the hollow organic fiber is desirably 0.5-3 pts. wt. per pt. wt. fiber though it depends upon the extent of hollowness of the organic fiber. It is desirable that 5-30 pts. wt. oil-containing organic fiber is mixed with 100 pts. wt. synthetic resin base.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is excellent! The present invention relates to a sliding oleoresin composition having Il friction and abrasion characteristics, and more specifically to a sliding oleoresin composition using hollow organic ms as an oil holding carrier.

BACKGROUND OF THE INVENTION It is known in the art to add lubricating oil to synthetic resins in order to improve their wear properties.

For example, in Japanese Patent Publication No. 48-37572, organic/inorganic powders with a specific surface area of 0.01 g/g or more are used as oil-retaining carriers, and the surfaces of these powders are coated with higher fatty acids, their salts, esters, amides, etc. One or more selected from chlorides or metal soaps, or by adsorbing these and mineral oil,
A method for uniformly dispersing it in a synthetic resin is shown.

Furthermore, Japanese Patent Publication No. 53-11018 discloses that a thermoplastic resin that dissolves in oil or absorbs oil at a temperature of 10°C above the flow temperature of the base resin is used as an oil retaining agent, and that the thermoplastic resin absorbs oil and swells. A method for uniformly dispersing a plastic resin in a synthetic resin as a base is shown.

However, according to these methods, the lubricating oil is dispersed within the base resin while being retained in an oil-retaining carrier or oil-retaining agent, which makes it difficult for the lubricating oil to migrate to the sliding interface, making it difficult to operate under harsh usage conditions. There was still a problem of insufficient lubricity at the bottom.

On the other hand, after heating and molding a synthetic resin powder mixed with powder such as water-soluble inorganic salts, a porous synthetic resin molded body is obtained by a method such as impregnating the molded product in water to dissolve and remove the salts. A method of impregnating the void with lubricating oil is also known. According to this method, oil leaches to the sliding interface well, but due to the pumping effect, the oil is sucked up and scattered at the sliding interface in a relatively short period of time, which reduces the sustainability of the lubrication effect. There was a problem with missing parts.

Furthermore, in JP-A-51-101047, a synthetic resin is added with lubricating oil, an organic φ inorganic powder that absorbs the lubricating oil, and an organic fiber that improves the surface leaching of the lubricating oil. Melt kneading using an extruder with
A method of making an oleoresinous plastic composition that is molded is presented. In this method, the lubricating oil absorbed or adsorbed by the organic and inorganic powder serving as the carrier is diffused and leached to the surface of the organic fiber (non-hollow fiber) through the unevenness and internal pores on the surface. Uniform dispersion requires special measures, and the role of organic fibers is auxiliary, so it is still insufficient in terms of transferring lubricating oil to the sliding interface.

Problems to be Solved by the Invention An object of the present invention is to solve the problems of the prior art described above and to obtain a sliding oleoresin composition in which lubricating oil easily transfers to the sliding interface.

Another object of the present invention is to achieve good oil leaching at the sliding interface, moderate oil leaching inside the base synthetic resin, good oil retention, and therefore long-term lubrication effect. The object of the present invention is to obtain an oleoresin composition for sliding that can maintain the long-lasting performance.

As a result of intensive research, the present inventors found that hollow organic 4
1! The inventors have discovered that the above object can be achieved by adding FIi male to the base resin, and have completed the present invention based on this finding.

A means for solving the problems, that is, the gist of the present invention is to provide a hollow organic Fa! There is provided an oleoresin composition for sliding, characterized in that it contains i.

Each component of the present invention will be explained in detail below.

(Substrate synthetic resin) Examples of the substrate synthetic resin used in the present invention include polyamide, polyacetal, polycarbonate, polyethylene, polyethylene terephthalate, polypropylene, polybutylene terephthalate, polyphenylene oxide, polyphenylene sulfide, styrene polymer,
Thermoplastic synthetic resins with high heat resistance such as acrylic polymers, polysulfone, polyallyl sulfone, and polyallyl ether, or thermosetting resins such as phenol resins, epoxy resins, polyester resins, urea resins, diallyl phthalate resins, etc. There is an elastomer. Among them, high-density polyethylene, polyamide, polyacetal, etc. can be preferably used.

These synthetic resins may be in any form such as powder or pellets.

These base synthetic resins are injected with known inorganic fillers such as glass fiber, talc, kaolin, calcium carbonate, glass powder, carbon fiber, and asbestos, metal powder or tetrafluoride resin powder, molybdenum disulfide, graphite, boron nitride, and fluoride. A solid lubricant such as graphite may be added, and a stabilizer or a small amount of lubricating oil may also be added.

These additives may be blended in advance with the base synthetic resin, or may be added during mixing or melt extrusion of the components of the present invention.

(Lubricating oil) Examples of the lubricating oil that can be used in the present invention include:
Spindle oil, refrigeration oil, dynamo oil, turbine oil, machine oil, gear oil, paraffinic and naphthenic mineral oils and greases, hydrocarbon oils, silicone oils, ester oils, polyglycols, polyphenyl ethers, halocarbon synthetic oils , fluorine oil, etc., and can be selected from a wide range of commercially available lubricating oils. In addition, as lubricity improvers, saturated fatty acids, unsaturated fatty acids, fatty acid esters, fatty acid amides,
Metal soap, higher alcohol, etc. may be used in combination.

(Hollow organic mllli) Hollow organic fibers used in the present invention are not particularly limited, but include hollow fibers with an outer diameter of about 0.2 mm that are used in dialyzers of artificial dialysers, ultrafiltration, etc. Hollow synthetic fibers such as hollow viscose rayon, nylon, and polyester, or natural fibers such as coconut fibers can be used. The length of these m-fibers can be appropriately selected depending on the molding method of the oleoresin composition. In other words, when compression molding is performed, it is possible to increase the amount of oil contained by using a relatively long weave, and when performing extrusion molding or injection molding, relatively short m fibers are used to increase the amount of oil contained. can be increased.

(Inclusion of lubricating oil, blending ratio, etc.) In order to contain (incorporate) lubricating oil in the hollow part of the hollow organic fiber, for example, hollow part 4+j! This can be suitably carried out by vacuum immersing the fibers in oil in advance.

In addition, an ordinary mixer or kneader can be used to uniformly disperse the hollow organic Fi & male containing lubricating oil in the base synthetic resin.

Furthermore, in order to uniformly disperse the oil-impregnated hollow organic fibers in the base synthetic resin, they are extruded using an extruder with two or more screw shafts, or they are made into extruded pellets or pulverized products, and then molded. It is preferable to do so.

The ratio of lubricating oil to hollow organic fibers is yes! Although it depends on the degree of hollowness of the fibers, there are no particular limitations, and it is usually preferably used in the range of 0.5 to 3 parts by weight per 1 part by weight of the hollow organic fibers. There is also no particular restriction on the blending ratio of the oil-impregnated hollow organic fibers to the base synthetic resin, but it is usually 5 to 5 parts by weight per 100 parts by weight of the base synthetic resin.
It can be suitably used in a range of 30 parts by weight. If the blending ratio of the hollow fibers m containing lubricating oil is extremely small, the effect of imparting lubricity will be small, and if it is too large, the original physical properties of the base resin will be impaired, which is not preferable.

Function The oleoresin composition for sliding of the present invention uses hollow organic fibers as an oil retaining material, and contains lubricating oil on the inner diameter side of the hollow portion*mm, which is uniformly dispersed within the base synthetic resin. be. And a hollow part 41 containing oil at the sliding interface!
When the fibers are exposed, the oil within the fibers quickly oozes out to the interface, providing a lubricating effect. Furthermore, oil leaching is suppressed inside the base synthetic resin due to the capillary action of the hollow organic H&male, and since the oil-containing hollow organic fibers are each independently dispersed, the added oil flows to the sliding interface. Leaching occurs gradually and the lubricating effect can be maintained for a long period of time.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example Fag g 3 mm hollow polyamide fibers were vacuum impregnated in ester oil to contain oil such that the weight ratio of hollow polyamide to ester oil was 1:1.

20% by weight was added to kernel oil-containing mmt-high-density polyethylene, mixed at room temperature with a universal mixer, then melt-kneaded and pulverized with a twin-screw kneader. The obtained pulverized product was free from stickiness due to oil and exhibited good fluidity. When a test piece with a thickness of 2 mm was molded using this material using an injection molding machine and a thrust friction test was performed, oil oozed out from the sliding interface and no wear marks were observed.

The thrust friction test conditions were as follows.

Mating material: 345 with an inner diameter of 9.6 mm and an outer diameter of 11.6 mm.
C Cylinder load: 15 kg Peripheral speed: 0.3 m/sec Time = 10 minutes Effects of the invention Thus, according to the present invention, by adding hollow organic fibers containing lubricating oil, the lubricant contained in the hollow organic fibers Oil-impregnated resin for sliding parts that not only has an extremely high lubrication effect as oil easily oozes out at the sliding interface, but also allows the added oil to gradually seep into the sliding interface, allowing the lubricating effect to be maintained over a long period of time. The composition can be obtained and is useful as a material for parts such as bearings, cams, and sliders that require sliding properties.

Claims (1)

[Claims] An oleoresin composition for sliding, comprising a base synthetic resin and hollow organic fibers encapsulating lubricating oil.