JPH10298428A - Sliding component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding component (e.g. bearing) having excellent frictional and abrasion resistance by injection-molding a resin composition comprising a specified aromatic polyamide imide resin and a polyester resin. SOLUTION: This component is prepared by injection-molding a resin composition comprising an aromatic polyamide imide resin prepared by reacting an aromatic tricarboxylic acid anhydride or both an aromatic tricarboxylic acid anhydride and an aromatic tetracarboxylic acid anhydride with a diisocyanate compound in such a manner that the imidization reaction is carried out after at least 70% of the amidation reaction is accomplished and a polyester resin. In this case, an aromatic polyamide resin (A) obtained by performing the amidation reaction at 50-100 deg.C and performing the imidization reaction at 100-200 deg.C is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding part formed using a resin composition comprising an aromatic polyamideimide resin and a polyester resin.

[0002]

2. Description of the Related Art In recent years, as the field of application of sliding bearings made of synthetic resin has expanded, heat-resistant synthetic bearings exhibiting good friction and wear resistance under the conditions of use of the bearings, especially in a high-temperature atmosphere. A sliding bearing made of resin is strongly demanded.

[0003] When phosphor bronze or the like is used as a sliding partner material of a bearing, the bearing is required to have a property of not damaging a relatively soft sliding partner material during use. As such a material, a polyamide resin or a polyester resin having excellent injection moldability and relatively good heat resistance is used. In this case, the polyamide resin or polyester resin
Since the self-lubricating property is poor, for example, a composition to which a lubricant such as graphite, a tetrafluoroethylene resin, a lubricating oil, and a metal oxide is added is used. In particular, in the case of polyamide resin, the slidability is degraded due to water absorption and the dimensional change of parts is remarkable, which is a serious problem in use.

[0004]

A composition obtained by uniformly mixing a polyester resin and a tetrafluoroethylene resin, when the sliding partner material is soft phosphor bronze or the like under high temperature conditions, damages the material and also causes the phosphor to be damaged. Also has the problem of wear. When carbon fibers are added to such a resin composition, soft phosphor bronze or the like, which is a sliding partner, may be damaged, and the friction / wear characteristics may deteriorate with the damage. Therefore, an object of the present invention is to solve the above-mentioned problems, and to prepare a heat-resistant and lubricating resin composition from an aromatic polyamideimide resin and a polyester resin produced by a specific method from an aromatic tricarboxylic anhydride and a diisocyanate compound. An object of the present invention is to realize friction characteristics and abrasion resistance which are superior to those of a conventional resin composition containing a polyester resin as a main component by using the above resin composition.

[0005]

Means for Solving the Problems The present inventors have intensively studied to solve the problems of the prior art and to develop an injection-moldable bearing part. It has been found that when a sliding component such as a bearing component is formed by using a resin composition comprising an aromatic polyamide-imide resin and a polyester resin produced by the method described above, the above-mentioned disadvantages are improved, and the present invention is completed. did.

That is, according to the present invention, when an aromatic tricarboxylic anhydride, or an aromatic tricarboxylic anhydride and an aromatic tetracarboxylic anhydride are reacted with a diisocyanate compound, the amidation reaction rate is over 70%. After that, a sliding component such as a bearing component is injection-molded using a resin composition comprising an aromatic polyamideimide resin (A) and a polyester resin (B) obtained by performing an imidization reaction. Things.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The production of the aromatic polyamide-imide resin (A) used in the resin composition of the present invention is generally carried out by appropriately conducting a polymerization temperature, a reaction time and a catalyst addition method. The reaction can be performed by controlling the imidation reaction and the imidation reaction.However, basically, the amidation reaction is performed under the condition that the imide group formation reaction does not occur until the amide group formation reaction is substantially completed. It does not matter if the reaction is carried out under conditions for performing an imidation reaction.

In order to obtain the aromatic polyamide-imide resin used in the present invention, as a method of performing an imidization reaction after the completion of the amidation reaction, a method of controlling the polymerization temperature is simple. That is, aromatic tricarboxylic anhydride (partially,
This includes the case where a dicarboxylic acid and / or an aromatic tetracarboxylic anhydride is contained. ) And a diisocyanate compound in a solvent at a temperature of 50 to 100 ° C, preferably 60 to 100 ° C, more preferably 80 to 100 ° C, and the amidation reaction is 70% or more, preferably 80%, more preferably After completion of 90%, most preferably 95% or more, usually 100 to 200 ° C, preferably 105 to 18 ° C
This is a method in which the imidization reaction is performed at a temperature of 0 ° C, more preferably 110 to 180 ° C.

[0009] The reaction temperature of the aromatic tricarboxylic anhydride (which can partially contain dicarboxylic acid and / or tetracarboxylic anhydride) with the diisocyanate compound is an important condition, and by controlling this, the reaction temperature is controlled. The aromatic polyamideimide resin constituting the resin composition used in the present invention can be produced. The temperature in each stage may be set as long as it is within the temperature range. For example, even if the temperature is raised,
Although this combination may be used, it is desirable to keep the temperature constant. When the temperature of each stage is lower than this range, the formation reaction of the amide and imide groups is not completed, and as a result, the degree of polymerization of the obtained aromatic polyamideimide resin does not increase. It becomes brittle.
When the temperature of amidation is higher than the above range, the reaction of forming an amide group and the reaction of forming an imide group occur simultaneously, so that the obtained aromatic polyamideimide resin has poor melt fluidity and retention stability. As a result, the resin composition of the present invention is not suitable for sliding parts such as sliding bearing parts obtained by injection molding.

The reaction time between the aromatic tricarboxylic anhydride and the diisocyanate compound is 30 minutes to 5 hours, preferably 30 minutes to 2 hours for the amidation reaction, and 30 minutes to 10 hours, preferably 1 minute for the imidization reaction. 8 hours to 8 hours. If the reaction time is too short, the degree of polymerization of the obtained aromatic polyamideimide does not increase, and the resin composition of the present invention becomes brittle. On the other hand, if the reaction time is too long, the resulting aromatic polyamide-imide resin will be inferior in melt fluidity and retention stability, and as a result, the resin composition of the present invention will be obtained by injection molding such as bearing parts. It is not suitable for the sliding parts. Although it is necessary to track the components of the amide group and the component of the imide group during the polymerization reaction, this method can be performed by a known infrared spectroscopy, gas chromatogram, or the like.

The aromatic tricarboxylic anhydride used for producing the aromatic polyamideimide resin used in the resin composition constituting the present invention is a compound represented by the following general formula.

[0012]

Embedded image (In the formula, Ar represents a trivalent aromatic group containing at least one carbon 6-membered ring.)

The following are specific examples of the aromatic tricarboxylic anhydride, but two or more compounds may be used in combination.

[0014]

Embedded image Among these, aromatic tricarboxylic anhydrides include:
Trimellitic anhydride is preferred.

The above aromatic tricarboxylic anhydrides of 0 to 5
It is also possible to replace 0 mol% with aromatic tetracarboxylic anhydride. However, if the amount of the aromatic tetracarboxylic anhydride is larger than the above range, the obtained aromatic polyamideimide resin tends to be brittle. The aromatic tetracarboxylic anhydride is a compound represented by the following general formula.

[0016]

Embedded image (In the formula, Ar ₁ represents a trivalent aromatic group containing at least one carbon 6-membered ring.)

Specific examples of the aromatic tetracarboxylic anhydride are as follows.

Embedded image

Further, it is possible to substitute 0 to 30 mol% of the above-mentioned aromatic tricarboxylic anhydride with aromatic dicarboxylic acid. As aromatic dicarboxylic acids, terephthalic acid, isophthalic acid, diphenyl ether-p, p'-dicarboxylic acid, diphenylmethane-p, p'-dicarboxylic acid, diphenyl-p, p'-dicarboxylic acid and naphthalene-2,6-dicarboxylic acid Acids and the like can be mentioned.

The diisocyanate compound used for producing the aromatic polyamideimide resin used in the resin composition constituting the present invention is a compound represented by the following general formula.

Embedded image O５CＯNＣRNＮC ＝ O (wherein, R represents a divalent aromatic and / or aliphatic group)

Specific examples thereof include the following, but a mixture of two or more compounds can also be used.

Embedded image

Preferred among these are the following.

Embedded image

Particularly preferred are the following.

Embedded image

Most preferred are m-phenylene diisocyanate, 2,4-tolylene diisocyanate,
Examples thereof include 6-tolylene diisocyanate and methylene di (4-phenyl isocyanate).

In order to produce an aromatic polyamideimide resin suitable for the resin composition used in the present invention, an aromatic tricarboxylic anhydride component (which can contain the above-mentioned dicarboxylic acid and tetracarboxylic anhydride) can be used. When the number of moles of the diisocyanate component is A and B, the molar ratio between the two is preferably maintained at 0.9 <A / B <1.10, more preferably 0.99 <A / B. B <1.0
It is kept at 1.

In the present invention, a solvent is used to smoothly produce an aromatic polyamideimide resin. The solvent used is not particularly limited as long as it is inert to the diisocyanate compound.
Examples of the solvent include a solvent having compatibility with an aromatic polyamideimide produced such as methylpyrrolidone and dimethylformamide and a polar solvent having no compatibility with an aromatic polyamideimide produced such as nitrobenzene and nitrotoluene. These may be used alone or as a mixture. However, solvents such as N-methylpyrrolidone and dimethylformamide which are compatible with polyamideimide are preferred. These solvents are used at a ratio of 0.1 to 4 mol / l based on the ratio of the monomer raw material to the solvent.

Various catalysts can be used for the production of the aromatic polyamideimide resin constituting the resin composition used in the present invention, but the amount of the catalyst should be minimized in order not to impair the melt processability. As long as the polymerization rate is at a sufficient level, it is desirable not to use it. Specific examples of the catalyst include tertiary amines such as pyridine, quinoline, isoquinoline, trimethylamine, N, N-diethylamine, and triethylamine; metal salts of weak acids such as cobalt acetate and cobalt naphthenate; heavy metal salts; and alkali metals. Salts and the like can be mentioned.

The water content of the polymerization system composed of a solvent, a monomer and the like is preferably kept at 500 ppm or less, more preferably at 100 ppm or less, most preferably at 50 ppm or less. If the water content in the polymerization system is higher than these, the melt moldability of the obtained resin composition is impaired.

The degree of polymerization of the aromatic polyamideimide resin suitable for the resin composition used in the present invention is from 0.15 dl / g to 0.15 dl / g in terms of reduced viscosity measured in dimethylformamide at 30 ° C. at a concentration of 1 g / dl. 1.0 dl / g is preferably used, and more preferably 0.2 dl / g to 0.6.
dl / g is most preferably 0.2 to 0.5 dl / g.
It is.

The aromatic polyamideimide resin constituting the resin composition used in the present invention comprises alcohols such as methanol and isopropanol, ketones such as acetone and methyl ethyl ketone, and aliphatic and aromatic hydrocarbons such as heptane and toluene. It is recovered as a powder by precipitation and washing, but the polymerization solvent cannot be directly concentrated. Furthermore, after concentrating to a certain extent, a method of removing the solvent under reduced pressure with an extruder or the like to form pellets can also be performed.

The polyester resin as the component (B) used in the resin composition used in the present invention refers to a thermoplastic resin having an ester bond in the main chain of the molecule. A polycondensate obtained from the derivative and a dihydric alcohol or a dihydric phenol compound, for example, a dicarboxylic acid or a polymer obtained from the derivative and a cyclic ether compound, or a polymer obtained from a metal dicarboxylate and a dihalogen compound Examples include polycondensates and ring-opening polymers obtained from cyclic ester compounds. The above-mentioned dicarboxylic acid derivatives refer to acid anhydrides, esters, acid halides and the like. Further, the dicarboxylic acid may be aliphatic or aromatic.

Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, chlorophthalic acid, nitrophthalic acid, p-carboxylphenylacetic acid,
p-phenylenediacetic acid, m-phenylenediglycolic acid, p-phenylenediglycolic acid, diphenyldiacetate, diphenyl-p, p'-dicarboxylic acid, diphenylether-p, p'dicarboxylic acid, diphenyl-m, m'- Dicarboxylic acid, diphenyl-4,4'-diacetic acid, diphenylmethane-p, p'-dicarboxylic acid, diphenylethane-p, p'-
Dicarboxylic acid, stilbene dicarboxylic acid, diphenylbutane-p, p'-dicarboxylic acid, benzophenone-4,4'-dicarboxylic acid, naphthalene-1,4-dicarboxylic acid, naphthalene-1,5-dicarboxylic acid, naphthalene-2, Examples thereof include 6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, p-carboxyphenoxyacetic acid and the like.

Examples of the aliphatic dicarboxylic acid include oxalic acid, succinic acid, adipic acid, coric acid, mazelaic acid, sebacic acid, dodecanedicarboxylic acid, undecanedicarboxylic acid, maleic acid, fumaric acid and the like. Examples of preferred dicarboxylic acids are aromatic dicarboxylic acids, especially terephthalic acid, isophthalic acid, naphthalene-2,6
-Dicarboxylic acids.

Examples of the dihydric alcohol include ethylene glycol, propane-1,2-diol, propane-1,3-diol, butane-1,4-diol, butane-1,4-diol,
2,2-dimethylpropane-1,3-diol, cis-2-butene-
1,4-diol, trans-2-butene-1,4-diol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, heptamethylene glycol,
Octamethylene glycol, decamethylene glycol and the like can be mentioned.

Examples of preferred dihydric alcohols include ethylene glycol, propane-1,2-diol, propane-1,3
-Diol, butane-1,3-diol and butane-1,4-diol.

More preferably, ethylene glycol and butane-1,4-diol can be mentioned.

Examples of the divalent phenol compound include hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, 2,2'-bis (4-hydroxyphenyl) propane, 1,1 ' -Bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl)
Examples thereof include sulfone, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) ketone, and 4-hydroxyphenyl-3-hydroxyphenylketone.

Examples of the cyclic ether compound include ethylene oxide and propylene oxide. Examples of the cyclic ester compound include ε-caprolactone and δ-valerolactone.

The dihalogen compound to be reacted with the metal dicarboxylate is a compound obtained by substituting the dihydric alcohol or the dihydric phenol compound with a halogen atom such as chlorine or bromine.

The polyester used in the resin composition of the present invention may be any polyester as long as it is produced by a known method using the above-mentioned raw materials. To illustrate a known method,
Examples include a transesterification method, direct dehydration condensation, and dehalogenated metal by interfacial polycondensation.

The ratio of the aromatic polyamide-imide resin (A) and the polyester resin (B) in the resin composition used in the present invention is 100% by weight of the total of both, and the aromatic polyamide-imide resin of the component (A) is used. Is 5 to 95% by weight, preferably 10 to 70% by weight, more preferably 1% by weight.
It is blended in the range of 0 to 65% by weight, most preferably 10 to 60% by weight. If the amount of the component (A) is larger than this amount, the obtained resin composition will have a lower fluidity at the time of melting, and if it is smaller, the heat resistance of the obtained resin composition will be lower.

The resin composition used in the present invention is produced by melt-kneading an aromatic polyamideimide resin and a polyester resin. The melt-kneading temperature is 200 to 400C, preferably 250 to 320C. The kneading method can be performed by using an extruder, a kneader, a Banbury mixer, a mixing roll or the like.
This is a method using an axial extruder.

The resin composition used in the present invention may contain, if desired, fillers, pigments, lubricants, plasticizers, stabilizers, ultraviolet rays, flame retardants, additives for flame retardants, and other resins. Other components can be appropriately blended.

Examples of the filler include glass beads, wollastonite, mica, talc, kaolin,
Mineral fillers represented by silicon dioxide, clay, asbestos, calcium carbonate, magnesium hydroxide, silica, diatomaceous earth, graphite, carborundum, molybdenum disulfide; glass fiber, milled fiber, potassium titanate fiber, boron fiber, And silicon carbide fibers. The filler is 1 to 70% by weight of the resin composition
Can be used. Preferred fillers are glass fibers, milled fibers, carbon fibers and potassium titanate fibers, and those treated with a silane coupling agent such as urethane or amino can also be suitably used.

Examples of the pigment include titanium oxide, zinc sulfide, zinc oxide and the like.

Typical examples of the lubricant include mineral oil, silicone oil, ethylene wax, polypropylene wax, metal salts such as sodium stearate, metal salts such as sodium montanate, and montanamide.

Examples of the flame retardant include phosphoric esters such as triphenyl phosphate, brominated compounds such as decabromobiphenyl, pentabromotoluene, and brominated epoxy resins; and nitrogen-containing phosphorus compounds such as melamine derivatives. Can be A flame retardant aid may be used, and examples thereof include compounds such as antimony, boron, and zinc.

Examples of other resins include epoxy resins, phenoxy resins, fluorine resins such as polytetrafluoroethylene, polysulfone, polycarbonate, polyphenylene ether, polyphenylene sulfide, polyether ketone, polyetherimide, and polythioether. Aromatic resins such as ketone and polyetheretherketone are exemplified.

In the present invention, a sliding component such as a bearing component is obtained by injection-molding a resin composition comprising the aromatic polyamideimide resin (A) and the polyester resin (B) as described above. Molding is performed by a normal injection molding method, and the cylinder temperature is 250 to
The temperature is set in the range of 350 ° C., and the temperature of the mold is preferably set to 120 to 160 ° C. in order to obtain sufficient heat resistance. Further, it is desirable to perform a heat treatment after molding for the purpose of improving heat resistance and removing residual stress. In particular, when molding is performed at a mold temperature lower than 120 ° C., heat treatment is preferably performed.
The method of the heat treatment is not particularly limited, and for example, an ordinary hot-air oven, a microwave oven or a microwave oven is used. The heat treatment temperature is 150-300 ° C,
Preferably 180-260 ° C, most preferably 20
30 seconds to 48 hours at 0 to 260 ° C., preferably 1 hour to
It can be carried out at normal pressure or reduced pressure for 36 hours.

As described above, the present invention provides a sliding component molded by injection molding using a resin composition comprising an aromatic polyamideimide resin (A) and a polyester resin (B), a sliding bearing component, Rolling bearing parts, thrust roller bearing parts, roller bearing parts, cylindrical roller bearing parts, auto tensioner parts, pulleys, washer parts, gears, distributor cams, transmission thrust washers, bearings, rotary sealing, bushes, brake bleeders, compressors Piston rings and vanes, bearing retainers, vacuum pump seal rings and packing, microwave oven drive gears and rollers, dryers, hair dryers,
Bearings for hair curlers, warm air heaters, coolers, etc., guides, copier separation claws, copier insulation sleeves, sliding plates, pinions, clutches, guides, stoppers, washers,
Examples include pads, flexible couplings, rolls, elevator sliding parts, chain tensioners, ceilings, metals, nozzles, and chemical valves.

[0050]

EXAMPLES The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The substances used in the following Examples and Comparative Examples were produced by the following and Production Examples.

(Synthesis Example) N-methylpyrrolidone having a water content of 15 ppm, 3 liters were charged to a reactor equipped with a 5 liter stirrer, a thermometer, and a reflux cooling tube equipped with a drying tube filled with calcium chloride at the tip. It is. To this was added 555 g (50 mol%) of trimellitic anhydride, followed by 503.3 g (50 mol%) of 2,4-tolylene diisocyanate. The water content in the system when trimellitic anhydride was added was 30 ppm. Initially, it takes 20 minutes from room temperature to raise the content temperature to 90
° C and polymerization was carried out at this temperature for 50 minutes. While the polymerization was being performed, the amount of the isocyanate group reduced and the amount of the imide group formed in 2,4-tolylene diisocyanate were measured. The measurement was carried out by sampling a small amount of the reaction solution with a syringe and quantifying the absorption at 2276 cm ^-1 of the isocyanate group by infrared spectroscopy. When polymerization was carried out for 50 minutes, the amount of isocyanate groups was reduced to 50 mol%. At this time, no imide group was absorbed. This confirmed that the amidation reaction was completed before the imidation reaction occurred. Thereafter, the temperature was raised to 115 ° C. over 15 minutes, and the polymerization was continued for 8 hours while maintaining the temperature. After the polymerization was completed, the polymer solution was dropped into 6 liters of methanol with vigorous stirring. The precipitated polymer was separated by suction filtration, further redispersed in methanol, washed well, and filtered.
Drying was performed at 35 ° C. for 6 hours to obtain a polyamideimide powder. Dimethylformamide solution (concentration 1.0 g / dl)
The measured reduced viscosity at 30 ° C. of the product was 0.25 dl / g.

(Production Example) Using the aromatic polyamideimide (abbreviation: PAI) obtained in the synthesis example, each component was melt-kneaded by a twin-screw extruder at a ratio shown in Table 1 to produce a resin composition. . The cylinder temperature at that time is 280-340
C. was performed.

[0053]

[Table 1] Resin composition PAI PET carbon fiber Polytetrafluoroethylene wt% wt% wt% wt% {125 35 40 2 33.4 46.6 10 10 360 60 40 60 40} ───────────── PET: polyethylene terephthalate resin, PA200D manufactured by Mitsubishi Rayon Co., Ltd. Carbon fiber: Kureka M107T manufactured by Kureha Chemical Co., Ltd. Polytetrafluoroethylene: Fluonlubricant manufactured by Asahi Glass Co., Ltd. L169J

(Measurement of Limit PV and Dynamic Friction Coefficient) Measurement was carried out at a linear velocity of 10, 50 and 150 cm / s using a thrust type friction and wear tester (EFM-3-EN manufactured by Orientec Co., Ltd.).
The mating material is steel (S45C) and phosphor bronze (C5191-
B) was used.

(Measurement of Specific Abrasion Amount and Specific Material Abrasion Amount) Using a thrust type friction and wear tester (MT-6 manufactured by Toyo Seiki Co., Ltd.), surface pressure of 5 kgf / cm ² , linear velocity of 30 cm / s, running The measurement was performed under the conditions of a time of 20 hours. The partner material is steel (S45C)
And phosphor bronze (C5191-B).

Example 1 The resin composition-1 shown in Table 1 was molded into a sliding bearing part shown in FIG. 1 using an injection molding machine. At that time, the cylinder temperature was 280 ° C, and the mold temperature was 145 ° C. The obtained molded article was evaluated by the following method, and the results are shown in Table 2.

Example 2 Example 1 was repeated, except that the resin composition-1 of Example 1 was changed to the resin composition-2. The evaluation was performed in the same manner as in Example 1,
The results are shown in Table 2.

Example 3 Example 1 was repeated, except that the resin composition-1 of Example 1 was changed to the resin composition-3. The evaluation was performed in the same manner as in Example 1,
The results are shown in Table 2.

Comparative Example 1 Example 1 was repeated, except that the resin composition-1 of Example 1 was changed to the resin composition-4. The evaluation was performed in the same manner as in Example 1,
The results are shown in Table 2.

[0060]

[Table 2]

[0061]

By using the resin composition comprising the aromatic polyamide-imide resin (A) and the polyester resin (B) of the present invention, a sliding part such as a bearing part formed by injection molding has excellent friction. It has properties and abrasion resistance, and has the advantage of being non-aggressive when a soft metal such as phosphor bronze is used as a sliding partner.

[Brief description of the drawings]

FIG. 1 is an example of a sliding bearing component illustrating one embodiment of the present invention.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Banichi 22 Wadai, Tsukuba-shi, Ibaraki Pref.

Claims (3)

[Claims] (1) When reacting an aromatic tricarboxylic anhydride, or an aromatic tricarboxylic anhydride and an aromatic tetracarboxylic anhydride with a diisocyanate compound, after the amidation reaction is completed by 70% or more, an imide group is prepared. Parts obtained by injection molding a resin composition comprising an aromatic polyamide-imide resin (A) and a polyester resin (B) obtained by performing a reaction for the formation of 2. The sliding component according to claim 1, wherein an aromatic polyamideimide resin (A) obtained by performing an amidation reaction at 50 to 100 ° C. and an imidation reaction at 100 to 200 ° C. is used. 3. The sliding component according to claim 1, wherein the sliding component is a bearing component.