JP2006283898A - Resin composition for sealing ring and resin sealing ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition for a sealing ring having excellent resistance to wear and creep and capable of being molded by auto mold and to provide the resin sealing ring formed by molding the resin composition. <P>SOLUTION: This resin composition for the sealing ring is formed by blending at least carbon black into polytetrafluoroethylene resin. Amount of DBP absorption of the carbon black is 100 to 300 cm<SP>3</SP>/100 g, and the carbon black of 0.5 to 15 weight% is blended into the whole resin composition. The resin composition is formed by blending at least one kind of filler or more selected from among carbon fibers and graphite of 0.5 to 40 weight% into the whole resin composition. The resin composition can be used as a molding material of auto mold. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin composition for a seal ring and a resin seal ring, and particularly seals a continuously variable transmission (hereinafter abbreviated as CVT) and a power steering device (hereinafter abbreviated as PS) in an automobile or the like. The present invention relates to a resin seal ring applied to a device having a high fluid pressure such as oil and a resin composition for a seal ring which is a molding material of the seal ring.

  Conventionally, cast irons have been used as seal rings for hydraulic devices, but as hydraulic devices have become smaller and lighter and have higher performance, development of seal ring materials with less oil leakage has been promoted. In comparison, a seal ring made of polytetrafluoroethylene (hereinafter abbreviated as PTFE) resin, which has good sealing properties and sliding properties, is often used. However, it is still not fully satisfactory, for example, a seal ring in which glass fiber or the like is blended with PTFE resin is used as a sealing material for a rotating part of an automatic transmission (hereinafter abbreviated as AT) of an automobile. In particular, there is a problem that the amount of oil leakage at a low oil temperature immediately after the start of operation is large, and sufficient sealing performance cannot be obtained.

This problem is due to the thermal expansion of the seal ring. That is, this type of seal ring is usually divided at one place on the circumference by providing a joint for easy assembly, but even if the gap width of the divided part immediately after installation is zero. As the oil temperature rises, the seal ring thermally expands, and compressive stress acts on the divided portion to cause creep deformation. If the oil temperature is lowered after the operation is stopped in this state, a gap is generated in the dividing portion. Therefore, when the operation is started again, the low-temperature sealing performance becomes insufficient.
In order to solve this problem, it may be possible to lengthen the deployment length of the seal ring by an amount commensurate with the amount of creep deformation, but in this case, the outer diameter of the seal ring is larger than the inner diameter of the counterpart cylinder, There is a problem that it cannot be incorporated. In addition, the seal ring which is not divided on the circumference has not only the same problem due to the thermal expansion but also difficult to incorporate.

  Conventionally, such a problem can be solved by using a seal ring (see Patent Document 1) composed of a composition containing fluorinated resin as a main component and ketjen black as a material that easily absorbs oil, and PTFE resin. A seal ring (see Patent Document 2) made of a material in which oil coke and carbon fiber are blended at a predetermined ratio is disclosed.

On the other hand, as a method for mass-producing molded articles having the same small dimensions, there is an automold (automatic compression molding), which is also adopted as a method for producing a PTFE resin seal ring. The auto mold forming process will be described with reference to FIG. 1 and FIG. FIG. 1 is an overall schematic diagram of an auto mold molding apparatus, and FIG. 2 is a diagram showing molding processes over time.
A fixed amount of powder 2 such as PTFE resin is automatically filled into the mold cavity 4 by the shuttle box 3 (FIGS. 1 and 2C). The upper ram 5 is lowered and compressed (FIG. 2 (a)), and in the latter half of the compression process, the lower ram 6 is pushed up and double-pressed (FIG. 2 (b)). After maintaining the pressure for a certain time, the upper ram 5 is raised, and then the lower ram 6 is pushed up to push out the preform 7 (FIG. 2D). This operation is performed automatically and continuously according to a preset cycle. The obtained preform is fired to obtain a product.

  In order to fill a certain amount of powder in an auto mold, there are a volume method and a weight method, and the volume method is generally performed. In this case, the mold cavity 4 itself is used as a weighing container as shown in FIG. First, the powder 2 is put into the shuttle box 3 by a certain amount from the hopper 9 through the valve 10. Next, the shuttle box 3 is placed on the mold cavity 4 and the lower ram 6 is lowered to suck the powder 2 into the mold cavity 4. At the same time, the shuttle box 3 is lightly shaken to swing the powder 2 The mold cavity 4 is filled sufficiently uniformly. In this capacity method, if the apparent density of the powder 2 is not constant, the filled weight varies and affects the dimensions of the preform 7. The operation of each ram is performed by the hydraulic cylinder 8.

When a sealing ring is manufactured by the above-described automold using the molding material of Patent Document 1 or Patent Document 2, the material powder becomes bulky and the material does not uniformly enter the mold, and the volume expansion after firing There is a problem that the mechanical strength such as tensile strength and elongation is not stabilized.
Moreover, since the seal ring in CVT developed in recent years is used in the region where the PV value (the value obtained by multiplying the load (P) and the sliding speed (V)) is higher than that in the conventional AT, Abrasion resistance and creep resistance required for seal rings are further required.
Japanese Patent No. 2675579 (Claims) JP 2003-35367 A (paragraphs “0019” to “0020”)

  The problems to be solved by the present invention are that a seal ring having an excellent sealing property cannot be obtained at a low temperature immediately after the start of operation, and that an auto-molding cannot be performed and an inexpensive seal ring cannot be provided. In addition, there is a demand for further improvement in wear resistance and creep resistance. An object of the present invention is to provide a resin composition for a seal ring that solves these problems and a resin seal ring obtained by molding the resin composition.

The resin composition for a seal ring of the present invention is a resin composition for a seal ring formed by blending at least carbon black with a polytetrafluoroethylene resin, and the carbon black has a DBP absorption of 100 to 300 cm ³ / 100 g, and 0.5 to 15% by weight based on the entire resin composition.
Here, the DBP absorption is defined in JIS K 6217-4 (2001), and indicates a measure of the ability of carbon black to absorb liquid (dibutyl phthalate (DBP)).

The resin composition is characterized in that at least one filler selected from carbon fibers and graphite is blended in an amount of 0.5 to 40% by weight based on the entire resin composition.
Moreover, the said resin composition is used as a molding material of an automold, It is characterized by the above-mentioned.

  The resin seal ring of the present invention is a resin seal ring for high-pressure fluid sealing having a joint, characterized in that the resin seal ring is obtained by molding the above-mentioned resin composition for seal ring. To do.

Plastic seal ring of the present invention, the carbon black DBP absorption is 100~300cm ³ / 100g, the seal ring resin composition of the present invention with respect to the total resin composition formed by 0.5 to 15 wt% blending Since it is obtained by molding, it expands when oil is absorbed, and fills gaps in the radial direction of the seal ring due to creep deformation at high temperatures, thereby improving the low-temperature sealability. Therefore, there is an excellent sealing property even at a low temperature immediately after the start of operation of the hydraulic device.
In particular, the resin seal ring of the present invention can be used as a seal ring for rotating shafts used under high PV conditions such as CVT, so that the amount of oil leakage can be reduced and the capacity of the oil pump can be reduced. is there.

In addition, since the resin composition for a seal ring of the present invention contains 0.5 to 40% by weight of at least one filler selected from carbon fiber and graphite with respect to the entire resin composition, the wear resistance An excellent and reliable seal ring can be provided.
Moreover, since the resin composition for seal rings of this invention can be utilized suitably as a molding material of an automold, it is possible to manufacture a seal ring at low cost.

  The resin composition for a seal ring of the present invention comprises a PTFE resin blended with at least carbon black, and preferably a blend of at least one filler selected from carbon fiber and graphite. It is. The PTFE resin, carbon black, carbon fiber, graphite and the like that can be used in the present invention will be described below.

Examples of PTFE resins that can be used in the present invention include PTFE resins and modified PTFE resins. The PTFE resin is a homopolymer of tetrafluoroethylene, and is a resin that is softened at 310 to 390 ° C. and can be compression-molded and extruded by an automold or the like, but cannot be subjected to normal injection molding.
The modified PTFE resin is a copolymer composed of a tetrafluoroethylene unit and a substituted tetrafluoroethylene unit in which the fluorine of tetrafluoroethylene is substituted with another organic group. The organic group is not particularly limited but is preferably a perfluoroalkyl ether group or a fluoroalkyl group.
Such a modified PTFE has a high melt viscosity of 1 × 10 ⁹ poise or higher at 370 ° C., is characterized by non-melt moldability, and has tetrafluoroethylene-perfluoroalkyl vinyl ether having melt moldability. It is a resin different from a copolymer (hereinafter abbreviated as PFA).
The use of modified PTFE having a modified structure in the molecular chain such as the perfluoroalkyl ether group or the fluoroalkyl group is preferable because the creep resistance is improved.
As the PTFE resin, granules having an average particle diameter of about 0.1 mm to 2 mm and relatively spherical are suitable for molding by auto molding. The average particle diameter is preferably about 0.2 mm to 0.5 mm.
Commercially available products of PTFE resin and modified PTFE resin include: Mitsui DuPont Fluoro Chemical Co., Ltd .: Teflon (registered trademark) 7J, TG70J, Asahi Glass Co., Ltd .: Aflon G163, Daikin Industries, Ltd .: Polyflon M111, Polyflon M112, and Hoechst: Hostaflon TFM1600 and the like can be mentioned.

In addition, for the purpose of improving creep resistance, the resin composition of the present invention includes a PFA resin, an ethylene-tetrafluoroethylene copolymer (hereinafter abbreviated as ETFE), a tetrafluoroethylene-hexafluoropropylene copolymer ( Hereinafter, a small amount of injection-moldable fluororesin such as FEP) may be added.
Perfluoro-based resins such as PTFE resin, PFA resin, FEP resin, etc. are those in which all of the carbon atoms constituting the skeleton molecular chain are surrounded by fluorine atoms by taking in a small amount of oxygen atoms, Since it is excellent in slidability and heat resistance due to the strong bond between C and F, it is suitable as a seal ring material.

The carbon black that can be used in the present invention, DBP absorption amount defined by JIS K 6217-4 can be used as long as 100~300cm ³ / 100g. The sealing ring for the resin composition of the present invention, by DBP absorption adding carbon black is 100~300cm ³ / 100g, during the seal ring used, the seal ring for oil automatic transmission (hereinafter, ATF And so on, and the abutment gap closes, so that the amount of oil leak can be reduced.
DBP absorption is less than 100 cm ^3/100 g, it can not be ensured swelling amount of up to close the closed gap of the seal ring. Further, in the case where the DBP absorption exceeds 300 cm ^3/100 g, the worse is mixed during the dispersion of the PTFE resin or the powder of the sealing ring for the resin composition becomes bulky, the mold during molding by auto mold The material does not enter uniformly, and the molded product expands after automolding or during firing, and a good molded product cannot be obtained. Further, the toughness as a seal ring is lost and the assemblability is also lowered.
Examples of commercially available products of the above conditions are satisfied carbon black, manufactured by Mitsubishi Chemical Corporation: # 4000B (DBP absorption ^{102cm 3 / 100g), # 4350B} (DBP absorption ^{169cm 3 / 100g), # 3600B} (DBP absorption 290 cm ³ / 100g).

  The carbon black is blended in an amount of 0.5 to 15% by weight with respect to the entire resin composition. If the blending amount is less than 0.5% by weight, the amount of swelling until the sealing ring gap is closed cannot be secured. Also, if the blending amount exceeds 15% by weight, the dispersion becomes worse when mixed with PTFE resin, the powder of the resin composition for sealing ring becomes bulky, and the mold is uniform during molding by auto molding. The material does not enter, and the molded product expands after automolding or at the time of firing, and a good molded product cannot be obtained. Further, the toughness as a seal ring is lost and the assemblability is also lowered.

  Since the resin seal ring of the present invention is used as a seal ring for high surface pressure such as CVT, the resin composition of the present invention is further improved from carbon fiber and graphite for the purpose of improving wear resistance and creep resistance. It is preferable to blend 0.5 to 40% by weight of at least one selected filler. When compounding more than 40% by weight, the dispersion becomes worse during mixing, the powder becomes bulky, and the material does not uniformly enter the mold during auto molding, and the molded product expands after auto molding or during firing. However, a good molded product cannot be obtained. Alternatively, since the amount of resin is reduced, a molded product having good physical properties cannot be obtained. Moreover, the toughness as a seal ring is lost and the assemblability is lowered.

Specific examples of the carbon fiber that can be used in the present invention include pitch-based and PAN-based ones. A pitch system is preferable. This is because pitch-based carbon fibers are less aggressive against the mating material and have better wear resistance than PAN-based fibers.
The average fiber length of the carbon fibers is preferably 0.01 to 1 mm, and more preferably 0.01 to 0.3 mm. Moreover, 1-25 micrometers is preferable, as for an average fiber diameter, 5-25 micrometers is more preferable, and 10-20 micrometers is still more preferable. If the average fiber length is less than 0.01, the reinforcing effect of the matrix of the resin composition itself is impaired and the mechanical properties are deteriorated. If the average fiber length exceeds 1 mm, uniform dispersion during mixing is extremely difficult, which impairs the wear properties. Cause quality degradation. Further, when the average fiber diameter is less than 1 μm, aggregation between fibers occurs and uniform dispersion becomes difficult, and when the average fiber diameter exceeds 25 μm, the mating material is worn.
Commercial examples of pitch-based carbon fiber include Kureka (registered trademark) series such as Kureha Chemical Industries: Kureka M207S (fiber diameter 12-13 μm), especially Kureka Chop M201F (average fiber diameter 12.5 μm, average) Fiber length 0.13 mm), M201S (average fiber diameter 14.5 μm, average fiber length 0.13 mm), and M107T (average fiber diameter 18.0 μm, average fiber length 0.70 mm).
In addition, in order to improve the adhesion between the fibrous reinforcing materials such as carbon fibers and the heat-resistant resin and improve the mechanical properties of the seal ring, the surface of these carbon fibers is epoxy resin or polyamide resin. Surface treatment may be performed with a treatment agent containing a polycarbonate resin, a polyacetal resin, or a silane coupling agent such as an epoxysilane or aminosilane.

The graphite that can be used in the present invention may be artificial or natural. For example, natural resins, petroleum pitches, tars, furan resins, polyacrylonitrile resins, epoxy resins, phenol resins, etc. are used as raw materials, for example, about 800 to 3000 ° C., depending on the raw materials, about 1200 Graphite calcined at a high temperature heat treatment temperature of ~ 2300 ° C can be used. If the heat treatment temperature is too low, the amount of fixed carbon in the graphite will not be sufficiently high, while if the heat treatment temperature is too high, graphite sublimation will occur and the pyrolysis of the graphite will proceed rapidly, It is not preferable because waste is caused in terms of energy efficiency for achieving such a high temperature.
Graphite forms include flakes, scales, spheres, rods, and the like, and it is preferable to adopt scales or plates in view of the reinforcing effect. Moreover, it is preferable to employ a carbon purity of 99.9% or more.
The average particle diameter of graphite is preferably 1 to 200 μm. If the average particle size is too large, the dispersion becomes poor when mixed with the PTFE resin, and if it is too small, it causes aggregation and the dispersion becomes poor.
Examples of commercially available graphite that satisfies the above conditions include Lonza Corporation: KS-6 and KS-25.

The resin seal ring of the present invention is obtained by molding the above resin composition for seal ring. The powder of the resin composition for a seal ring of the present invention is used as a molding material, and after being made into a preform by the automolding process shown in FIGS. 1 and 2, this is fired to obtain a resin seal ring product.
An example of the resin seal ring of the present invention is shown in FIG. 3A shows a resin seal ring in which the shape of the joint portion is a straight cut shape, and FIG. 3B shows the resin seal ring in which the shape of the joint portion is an angle cut shape.
As shown in FIGS. 3 (a) and 3 (b), the resin seal ring 1 of the present invention has an abutment portion 1a cut in part. Installed. Since the resin seal ring of the present invention is provided at a location where the lubricating oil is at a very high pressure and high temperature, or at a location where it slides at high speed, the pressure resistance, heat resistance, wear resistance, creep resistance, etc. Characteristics are required.

Since the resin seal ring 1 has sufficient wear resistance, creep resistance, etc. by blending a predetermined amount of filler such as carbon black and the above carbon fiber into the PTFE resin as described above, for example, It can be used to seal high-pressure fluid such as hydraulic oil in a hydraulic mechanism such as CVT, absorbs the oil during use, swells, and prevents oil leakage from the gap of the joint portion 1a. Can do.
In addition to the straight cut shape shown in FIG. 3 (a) and the angle cut shape shown in FIG. 3 (b), the shape of the abutment portion 1a is combined with each other in a step shape to be effective in preventing oil leakage. There are cut shapes. In the resin seal ring of the present invention, oil leakage can be effectively prevented with a straight cut shape or an angle cut shape seal ring without using such a composite step cut shape, so that production costs can be suppressed.

An application example of the resin seal ring of the present invention will be described with reference to FIG. FIG. 4 is a sectional view of a lock-up clutch of a torque converter to which a resin seal ring is attached.
A torque converter, which is a hydraulic mechanism such as AT or CVT, has a mechanism for transmitting power from the engine to the turbine side via hydraulic oil. In addition, power transmission using only hydraulic fluid causes problems such as energy loss due to fluid slippage and poor fuel consumption.Therefore, when the difference in rotational speed between the input side and output side is small, the input side and output A lock-up clutch is mechanically connected to the side of the torque converter. The lock-up clutch is controlled by hydraulic oil flowing through the torque converter body.
In the torque converter, an oil seal ring for sealing the hydraulic oil is attached to a point that requires an oil seal in order to normally perform operations such as power transmission and a lock-up clutch. Such an oil seal ring can be attached to a contact portion with the rotating shaft and the like, and sufficient oil sealing performance is required even at high speed rotation.

In the torque converter shown in FIG. 4, an impeller 11 connected to an output shaft of an engine and a turbine 12 connected to an input shaft of a transmission are arranged to face each other, and a stator shaft fixed to a casing via a one-way clutch 13. The stator 14 is attached, and when returning the fluid flowing back between the impeller blade 11a and the turbine blade 12a formed in a bowl shape from the turbine 12 side to the impeller 11 side on the inner diameter side, By changing the fluid flow direction, a forward rotational force is applied to the impeller 11 to amplify the transmission torque.
Further, the piston 15 of the lockup clutch is supported on the turbine hub 12b so as to be axially movable or rotatable with respect to the hub. A resin seal ring 1 is provided for oil sealing between the piston 15 and the turbine hub 12b. The oil chamber A is sealed with respect to the oil chamber B by the resin seal ring 1. Power can be directly transmitted to the turbine 12 by increasing the pressure in the oil chamber A and pressing the piston 15 against the front cover 16 where the output from the engine enters.

The raw materials used in the following examples and comparative examples are collectively shown as follows.
PTFE1: PTFE resin (Mitsui DuPont Fluorochemical Co., Ltd .: Teflon 7J)
PTFE2: Modified PTFE resin (Mitsui DuPont Fluoro Chemical Co., Ltd .: Teflon 70J)
CB1: Carbon black (Mitsubishi Chemical Corporation: # 4000B DBP absorption 102cm ³ / 100g)
CB2: Carbon black (Mitsubishi Chemical Corporation: # 3600B DBP absorption 290cm ³ / 100g)
CB3: Carbon black (Mitsubishi Chemical Corporation: # 950 DBP absorption 79cm ³ / 100g)
CB4: Carbon black (Lion Corporation: Ketjen Black EC DBP absorption 360cm ³ / 100g)
GRP: Graphite (manufactured by Nippon Graphite Co., Ltd .: ACP)
CF: Carbon fiber (manufactured by Kureha: M107T)

Examples 1 to 6
A composition having the blending ratio shown in Table 1 is molded by auto molding, and a ring having an outer diameter of 34 mm, a width of 1.9 mm and a wall thickness of 1.7 mm is turned from the obtained molded body, and a diameter on one part on the circumference is turned. The resin seal ring in each Example was obtained.
The obtained resin seal ring was subjected to the following thermal cycle test and friction wear test.
In addition, an automolding test was conducted using a mold having a mold outer diameter of 44 mm, an inner diameter of 40 mm, and a length of 30 mm. As the auto moldability, Table 1 shows the case where the molding can be stably molded and has a theoretical specific gravity after firing, and the case where the molding is impossible or the specific gravity is 0.1 or more lower than the theoretical specific gravity is shown as x.

Thermal cycle test:
A thermal cycle test apparatus is shown in FIG. In FIG. 5, resin seal rings 1, 1 ′ are attached to ring grooves 18, 18 ′ of the shaft 17 made of SCM420H, and are incorporated in a casing 19 made of cast iron (FC25). An oil supply pipe 20 from a hydraulic pressure generator (not shown) is provided above the casing 19, and the hydraulic pressure is measured by a hydraulic gauge 21. There is a discharge pipe 22 for discharging the leaked oil at the lower part, and the amount of leaked oil is measured by the measuring cylinder 23. Injecting ATF (Toyota Genuine: ATF WS) 24 into the casing 19 and filling it with oil (no hydraulic pressure applied), the temperature of the constant temperature bath 25 is −40 ° C. for 7 hours, and + 165 ° C. for 7 hours. 5 cycles are changed as one cycle.
Leakage measurement was performed before and after this thermal cycle at a hydraulic pressure of 10 kgf / cm ² , a shaft rotation speed of 0 rpm, and an oil temperature of 25 ° C. and 60 ° C. In addition, the size of the gap at the resin seal ring part was also measured before and after the thermal cycle. The obtained results are shown in Table 1.
The measuring method of the gap was made by placing a resin seal ring on the inner diameter of the casing used in the test and measuring the gap with a tool microscope. The measurement temperature is 25 ° C.

Friction and wear test:
A ring test piece having an inner diameter of 17 mm, an outer diameter of 21 mm, and a height of 10 mm was used, and S45C was used as the mating material, and a 50-hour wear test was conducted in ATF using a Suzuki (thrust) friction wear tester. The test conditions are a surface pressure of 3 MPa and a peripheral speed of 120 m / min. The dimension of the test piece in the height direction was measured before and after the test, and the difference was defined as the wear amount (μm). The obtained results are shown in Table 1.

Comparative Examples 1 to 6
In the same manner as in the examples, resin seal rings were prepared using the compositions having the blending ratios shown in Table 1, and the same tests and verifications as in the examples were performed. The obtained results are also shown in Table 1.

In Comparative Example 1, there is no problem as the characteristic of the resin seal rings, since the material for the carbon black DBP absorption 360 cm ^3/100 g is compounded is difficult bulky auto molding, produced inexpensively I can't. In the evaluation test for Comparative Example 1, a test piece cut out from normal molding was used.
In the resin seal ring filled with graphite and the resin seal ring filled with carbon fiber of Comparative Example 2 and Comparative Example 3, the amount of oil leakage cannot be suppressed.
Even in Comparative Example 4, the amount of swelling is small and the amount of oil leakage cannot be suppressed as in each example.
In Comparative Example 5 and Comparative Example 6, a stable molded product could not be obtained. In normal molding, molding was possible, but evaluation was not possible because cracks occurred after firing or the specific gravity was considerably lower than the theoretical value due to expansion.
The resin seal ring of each example according to the present invention satisfied all of the wear resistance, oil leakage, and auto moldability, and showed superior performance compared to the comparative example.

  The resin seal ring of the present invention is excellent as wear resistance, creep resistance and the like, and can suppress the amount of oil leakage. Therefore, it is suitable as a seal ring for rotating shafts used under high PV conditions such as CVT. Can be used for Moreover, the resin composition for seal rings of this invention can be used conveniently as a molding material of an automold.

It is a whole schematic diagram of an automolding device. It is a figure which shows the shaping | molding process by an automold with time. It is a figure which shows an example of the resin-made seal rings of this invention. It is sectional drawing of a torque converter with a lockup clutch. It is the principal part sectional drawing which showed the principle of the heat cycle tester.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin seal ring 2 Powder 3 Shuttle box 4 Mold cavity 5 Upper ram 6 Lower ram 7 Preliminary product 8 Hydraulic cylinder 9 Hopper 10 Valve 11 Impeller 12 Turbine 13 One-way clutch 14 Stator 15 Piston 16 Front cover 17 Shaft 18 Ring Groove 19 Casing 20 Supply pipe 21 Hydraulic gauge 22 Discharge pipe 23 Female cylinder 24 Oil 25 Constant temperature bath

Claims (4)

A resin composition for a seal ring formed by blending at least carbon black with a polytetrafluoroethylene resin,
The carbon black is a DBP absorption 100~300cm ³ / 100g, the seal ring resin composition characterized in that it is 0.5 to 15 wt% blended with respect to the total of the resin composition.   2. The seal according to claim 1, wherein the resin composition comprises 0.5 to 40% by weight of at least one filler selected from carbon fiber and graphite with respect to the entire resin composition. Resin composition for ring.   The resin composition for a seal ring according to claim 1 or 2, wherein the resin composition is used as a molding material for an auto mold. A resin seal ring for sealing a high-pressure fluid having a joint,
The resin seal ring is obtained by molding the resin composition for a seal ring according to claim 1, claim 2 or claim 3.

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