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Fluororesin, method of reforming fluororesin, sliding member, and sliding device

a fluororesin and fluororesin technology, applied in the field of fluororesin, method of reforming fluororesin, sliding member, sliding device, etc., can solve the problems of inapplicability and increase in cos

Inactive Publication Date: 2006-02-09
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a fluororesin with low friction and superior wear resistance that exhibits a superior friction characteristic in the presence of lubricating oil and operating oil. This is achieved by introducing an oxygen-containing functional group into the fluororesin through an appropriate unsaturated bond introduction process. The invention also provides a method of reforming the fluororesin by extracting hydrogen atoms and / or fluorine atoms bonded to carbon atoms of a main frame resin to introduce an unsaturated bond and applying dissociation energy of the unsaturated bond in the presence of oxygen. The invention also includes a sliding member comprising the fluororesin in a sliding portion, a sliding apparatus comprising the sliding member and at least one oil material, and a sliding system comprising the sliding apparatus and a target material which comprises a sliding surface on which the sliding member slides.

Problems solved by technology

However, since a special step for increasing surface energy is required in any of the above-described methods, there has been a problem that costs rise.
However, two types of manufacturing steps have to be added, a cost aspect raises a problem, and therefore this method has not been put into practical use in the present situations.

Method used

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  • Fluororesin, method of reforming fluororesin, sliding member, and sliding device
  • Fluororesin, method of reforming fluororesin, sliding member, and sliding device
  • Fluororesin, method of reforming fluororesin, sliding member, and sliding device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069] Tetrafluoroethylene superior in low friction among fluororesins was used as the main frame resin, the molding powder (manufactured by Asahi Glass Co., Ltd., trade name G163) was irradiated with electron rays (pressurizing voltage of 2 MeV) in an atmosphere having an oxygen concentration of 1 Torr, nitrogen concentration of 800 Torr on heating conditions at 350° C. to introduce an unsaturated bond into the powder, and a targeted precursor of the fluororesin was obtained. Next, the precursor was crushed with a jet mill until an average particle diameter reached about 20 μm.

[0070] A fluororesin precursor obtained by subjecting 90% of a resin (G163) (which was the same as the main frame resin used in the above-described unsaturated bond introducing process) was added by 10%. A powder mixture was sufficiently mixed with a mixer. Thereafter, the mixture was treated at 300° C. for 12 hours, a high-temperature volatile component was removed, and a fluororesin mixture, that is, a mix...

example 2

[0072] To 70% of the above-described main frame resin (G163), 30% of a precursor fluororesin into which an unsaturated bond was introduced in a method similar to that of Example 1 was added, and worked into a ring test piece in the same manner as in Example 1.

example 3

[0073] To 60% of the above-described main frame resin, 30% of a precursor fluororesin into which an unsaturated bond was introduced in the same manner as in Example 1, and 10% polyamide imide powder (manufactured by Amoco Co., trade name Tohron 4203L, average particle diameter of 15 μm) were added. Thereafter, the material was worked into a ring test piece in the same manner as in Example 1.

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Abstract

There is provided a fluororesin which has a low friction coefficient, superior wear resistance and a superior friction characteristic in the presence of a lubricating oil and / or an operating oil. The fluororesin has a structure in which some of the hydrogen atoms and / or fluorine atoms bonded to carbon atoms of a main frame resin are substituted with an oxygen-containing functional group. Visible light transmittance in a wavelength of 600 nm is increased as compared with that of the main frame resin. There is also provided a method of reforming a fluororesin, comprising extracting some of the hydrogen atoms and / or fluorine atoms bonded to carbon atoms of a main frame resin to introduce an unsaturated bond; and applying dissociation energy of the unsaturated bond in the presence of oxygen. There are further provided a sliding member, a sliding apparatus and a sliding system.

Description

[0001] This application claims the benefit of Japanese Application No. 2004-187190, filed Jun. 25, 2004, the entirety of which is incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention relates to a fluororesin which has both low friction coefficient and excellent wear resistance, particularly to a fluororesin preferably for use under lubrication by a lubricating oil or an operating oil, and a sliding member and a sliding device comprising such a fluororesin. BACKGROUND OF THE INVENTION [0003] Since fluororesins have low friction coefficients, they heretofore have been used in many sliding portions. However, since fluororesins have a band structure, they are generally inferior in wear resistance. As a measure for enhancing the wear resistance of the fluororesin, it is common to add fiber-based fillers such as glass fibers and carbon fibers or metal fillers such as bronze. However, when these fillers are added, the fillers promote wear on a sliding targe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M145/00
CPCC10M107/38C10M2213/023C10N2230/06C10M2213/0606C10M2213/0623C10M2213/043C10N2030/06
Inventor OTA, TOMOHITOHASHIMOTO, TOMOHITO
Owner NISSAN MOTOR CO LTD