JP2005325346A - Sliding material composition and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding material composition which bears a high temperature and a high load, has a small friction coefficient, hardly wears, rapidly dissipates generated heat, and does not damage a mating member even when it has a soft material quality, and its manufacturing method. <P>SOLUTION: The manufacturing method of the sliding material composition comprises kneading a thermoplastic resin and a carbon fiber obtained by the vapor phase method having a fiber diameter of 50-200 nm, an aspect ratio of 40-1,000, a peak intensity ratio of a peak at 1,360 cm<SP>-1</SP>to a peak at 1,580 cm<SP>-1</SP>(I<SB>0</SB>=I<SB>1,360</SB>/I<SB>1,580</SB>) in the Raman scattering spectrum of 0.1-1 and a bulk specific gravity of 0.01-0.1 so that the composite material composition contains 10-70 mass% of the carbon fiber obtained by the vapor phase method without a high shear force while holding the breakage ratio of the carbon fiber to at most 20%. The manufacturing method of the shearing material molded product comprises molding the sliding material composition at a mold temperature higher by 20-40°C than the temperature at the time of injection molding where the excellent article ratio is at least 95% with a cooling time of 5 sec. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a sliding material composition, and more specifically, friction wear characteristics (high load resistance, low friction coefficient, wear resistance, high thermal conductivity) obtained by filling a specific resin with a specific vapor grown carbon fiber. In addition, the present invention relates to a sliding material composition excellent in heat resistance and mechanical properties.

Plastic sliding members are promising because their application fields tend to be expanded in mechanical parts in the electric / electronic field and in the automobile field. However, the plastic material has a self-lubricating property which is a characteristic required for the sliding member, but the limit PV value [the sliding member has a constant load P (kg / cm ² ) as compared with the metal material. , The limit value (the product of P and V) of the load that melts or seizes when a peripheral speed V (cm / sec) or more is reached. ] And thermal conductivity is low and heat accumulation is inevitable, so that the mechanical properties such as rigidity are inferior. Therefore, a plastic material as a sliding member such as a bearing not only has mechanical properties such as strength and rigidity, but also has a small coefficient of dynamic friction, a small amount of wear, a high limit PV value, and does not damage the mating material. A material having slidability is desirable.

  Carbon fiber resin composite materials are often used mainly for the purpose of improving mechanical properties, and have been used in a wide range of fields such as aerospace, automobiles, sports, and industrial materials. The carbon fibers used as these fiber fillers are mainly baked acrylic fibers or pitch fibers. Although composite materials using such carbon fibers have excellent mechanical properties and heat resistance, they are unsatisfactory in wear resistance, so when used as sliding members for various industries, their service life is short and practical. However, desirable results are not always obtained. Furthermore, steel is generally used as the counterpart material for the sliding member, but in the future, lighter materials such as aluminum will tend to be used. Since the carbon fiber composite sliding member is damaged not only by the soft aluminum but also by the hard steel, such a carbon fiber is not suitable as the sliding member.

On the other hand, there is a proposal of a sliding material obtained by mixing vapor-grown carbon fiber or vapor-grown carbon fiber graphitized by heat treatment with synthetic resin (see, for example, Patent Document 1). This is an improvement only in the properties, and it cannot be said that the load resistance and heat resistance required for the sliding material are sufficient.
There has been proposed a sliding member obtained by dispersing vapor-grown carbon fiber or vapor-grown carbon fiber graphitized by heat treatment in a synthetic resin together with molybdenum disulfide fine powder (see, for example, Patent Document 2). However, since it uses a synthetic resin, it is not suitable for use at high temperatures, in the presence of corrosive fluids or under high load conditions, and by containing molybdenum disulfide, Then, oxidation of molybdenum occurs, and the friction coefficient may increase.

Also proposed is a bearing material that mixes vapor-grown carbon fiber, molybdenum disulfide, graphite, PTFE, etc. with polyamide resin or polyimide resin, which is the main material, and makes it a sliding material, which does not increase the friction coefficient and reduces wear. (For example, refer to Patent Document 3). However, in this case as well, the use conditions are limited as in the above case.
Further, there is a proposal of a sliding member having a multilayer structure in which a composite material containing a carbon nanotube having a good sliding property on a surface layer is formed of a heat-resistant material in an inner layer (see Patent Document 4). Although satisfactory in terms of performance, expensive carbon nanotubes are used, the manufacturing method is very troublesome, and there is a problem in economy and the like.

JP-A-3-38327 Japanese Patent Laid-Open No. 4-11893 JP-A-5-59387 JP 2003-239777 A

  This invention has been made in view of the above, and can withstand high temperature and high load, has a small friction coefficient, is not easily worn, and has good thermal conductivity, so that the generated heat can be quickly released, Furthermore, even if a counterpart material is aluminum, for example, it aims at providing the sliding material composition which can hold | maintain performance for a long time without damaging aluminum, and its manufacturing method.

  In order to solve the above-mentioned problems, the present inventor has intensively studied, and as a result, introduced a specific vapor grown carbon fiber, which was impossible in the past by suppressing the breakage of the fiber as much as possible. It has been found that the performance of the composite material is reached and the present invention has been reached.

That is,
[1] and the matrix synthetic resin, fiber diameter: 50 to 200 nm, aspect ratio: 40 to 1000, 1580 cm ^-1 and peak intensity ratio of 1360 cm ^-1 of the Raman scattering spectrum _{(I 0 = I 1360 / I} 1580): 0. A sliding material composition, wherein the heat distortion temperature of ASTM D 648 heavy load is 160 ° C. or higher, and kneaded 1-1 gas phase grown carbon fiber,
[2] The sliding material composition according to [1], wherein 10 mass% to 70 mass% of vapor grown carbon fiber is blended,
[3] The sliding material composition according to the above [1] or [2], wherein the thermal conductivity is 1 W / mK or more,
[4] The sliding material composition according to any one of [1] to [3], wherein the flexural modulus is 4000 MPa or more,

[5] The thermoplastic resin and fiber diameter: 50 to 200 nm, aspect ratio: 40 to 1000, 1580 cm ^-1 and peak intensity ratio of 1360 cm ^-1 of the Raman scattering spectrum _{(I 0 = I 1360 / I} 1580): 0.1 Sliding characterized by kneading a vapor grown carbon fiber having a bulk density of 0.01 to 0.1 with a breaking rate of the carbon fiber of 20% or less and without applying a high shearing force. Manufacturing method of the material composition,
[6] The sliding material according to [5], wherein 10% by mass to 70% by mass of the vapor-grown carbon fiber is blended in the composite material when the thermoplastic resin and vapor-grown carbon fiber are kneaded. Production method of the composition,
[7] When kneading the thermoplastic resin and the vapor grown carbon fiber, the fracture rate of the carbon fiber is suppressed to 20% or less, melted and kneaded with a pressure kneader, and then a single screw extruder or a reciprocating single screw The method for producing a sliding material composition according to the above [5] or [6], which is pelletized with an extruder,

[8] A sliding material composition produced by the method for producing a sliding material composition according to any one of [5] to [7], wherein the mold temperature is 5 seconds and the non-defective product ratio is 95. %, A method for producing a sliding material molded body characterized by molding at a temperature 20 ° C to 40 ° C higher than the temperature during injection molding,
[9] A sliding synthetic resin molded article using the resin composition produced by the method for producing a sliding material composition according to any one of [5] to [7], and [10] [5] above The above-mentioned problems have been solved by developing a non-lubricated sliding material using a resin composition produced by the method for producing a sliding material composition according to any one of [7].

  In the present invention, when vapor-grown carbon fiber having a high aspect ratio (an aspect ratio of 40 or more) is blended in a synthetic resin and melt-kneaded, the reduction of the aspect ratio is suppressed as much as possible, and high filling is achieved by high filling. Withstands, has a small coefficient of friction, is hard to wear, and has good thermal conductivity, it can quickly release the generated heat, and even if the counterpart material is aluminum, it does not damage the aluminum The present invention has achieved a sliding material composition capable of maintaining performance for a long period of time, and its industrial utility value is extremely large.

  The sliding material composition according to the present invention does not impair the fluidity inherent in the resin, and the sliding member obtained from this composition has excellent mechanical properties, heat resistance, and thermal conductivity, and is slidable. With regard to, both the coefficient of friction and the amount of wear are small, and the limit PV value is very large. Therefore, it can be used for a wide range of applications as a sliding member in automobiles, electrical / electronic fields and the like.

The vapor grown carbon fiber used in the present invention can be produced, for example, by blowing an organic compound gasified together with iron serving as a catalyst into an inert gas and a high temperature atmosphere (for example, JP-A-7-150419). (See the official gazette).
The vapor grown carbon fiber can be used as it is produced, for example, one produced by heat treatment at 800-1500 ° C., or one produced by graphitization at 2000-3000 ° C., for example.

  The cross section of the fiber is not limited to a perfect circle, but includes an ellipse or a diversified one. Further, a carbonaceous material formed by depositing pyrolytic carbon may be present on the fiber surface. After the vapor grown carbon fiber is manufactured, the crystallinity can be further increased and the conductivity can be increased by performing a heat treatment at a temperature of 2000 ° C. or higher.

The vapor grown carbon fiber used in the present invention preferably has the following physical property values.
(A) Fiber diameter: 50 to 200 nm, preferably 80 to 180 nm.
(B) Aspect ratio: 40 to 1000, preferably 45 to 800.
(C) BET specific surface area: 5 to 100 m ² / g, preferably 10 to 50 m ² / g.
(D) Peak intensity ratio (I ₀ = I ₁₃₆₀ / I ₁₅₈₀ ) of ₁₅₈₀ cm ⁻¹ and 1360 cm ⁻¹ of the Raman scattering spectrum: 0.1 to 2, preferably 0.1 to 1.5.

The above physical property values have an important relationship with the present invention. That is, (i) (c), although the fiber diameter and the specific surface area are in an inversely proportional relationship, the same effect is obtained. When the fiber diameter is smaller than 50 nm or the specific surface area is 100 m ² / g or more, the cohesive energy of the carbon filler is large, and it is difficult to achieve uniform dispersion of the carbon filler in the matrix resin. Dispersion can be achieved. On the other hand, when the fiber diameter is 200 nm or more and the specific surface area is 5 m ² / g or less, the sliding characteristics with respect to the aluminum material deteriorate.
(B) When the aspect ratio is 40 or less, the heat resistance (thermal deformation temperature) is not improved, and the surface of the molded product is melted due to heat generated by friction, so that the limit PV value cannot be increased.
(D) When the Raman spectrum ratio is 2 or more, the graphite structure exhibiting solid lubricity decreases and the sliding characteristics deteriorate.
There will be an impact.

  The synthetic resin used in the present invention can be used if it satisfies the desired heat resistance, thermal conductivity, and mechanical properties. Specifically, engineering plastics, super engineering plastics, thermosetting resins, and the like.

The thermoplastic resin is not particularly limited as long as it satisfies the above conditions and is used in the molding field. For example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate ( Polyester such as PTT), polyethylene naphthalate (PEN), liquid crystal polyester (LCP), polyolefin such as polypropylene (PP), syndiotactic polystyrene resin, polyoxymethylene (POM), polyamide (PA), polycarbonate (PC), polyphenylene ether (PPE), polyphenylene sulfide (PPS), polyimide (PI), polyamideimide (PAI), polyetherimide (PEI), polysulfone (PSU), polyethersulfone Polyketone (PK), Polyetherketone (PEK), Polyetheretherketone (PEEK), Polyetherketoneketone (PEKK), Polyarylate (PAR), Polyethernitrile (PEN), Polytetrafluoroethylene (PTFE), etc. Fluorine-based resins, copolymers, modified products thereof, and resins obtained by blending two or more types may also be used.
Further, in order to further improve impact resistance, a resin obtained by adding another elastomer or a rubber component to the thermoplastic resin may be used.

The thermosetting resin is not particularly limited as long as it is a resin used in the molding field. For example, unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol (resole type) resin, urea melamine resin. Polyimide resins and the like, copolymers thereof, modified products, resins blended in two or more, and the like can be used. Further, in order to further improve the impact resistance, a resin obtained by adding an elastomer or a rubber component to the thermosetting resin may be used.
The content of the vapor grown carbon fiber is 10 to 70% by mass, preferably 12 to 60% by mass, more preferably 15 to 50% by mass (based on the sliding material composition). FIG. 1).

  In the sliding material composition according to the present invention, various other resin additives can be blended within a range that does not impair the object and effect of the present invention. Examples of resin additives that can be blended include colorants, plasticizers, lubricants, heat stabilizers, light stabilizers, ultraviolet absorbers, fillers, foaming agents, flame retardants, and rust inhibitors. These various resin additives are preferably blended in the final step when the conductive plastic according to the present invention is prepared.

  As a method of mixing and kneading each component constituting the sliding material composition, it occupies an important position of the present invention, and particularly suppresses breakage of vapor grown carbon fiber as much as possible, and breakage rate is 20% or less, preferably 15 % Or less, more preferably 10% or less. The degree of breakage can be evaluated by comparing the aspect ratios of carbon fibers before and after mixing and kneading (for example, determined by SEM observation). Furthermore, as a result of intensive investigations into highly filling a resin with a very low bulk specific gravity of 0.01 to 0.1, it has been found that the following method is good.

  In general, when an inorganic filler is melt-kneaded into a thermoplastic resin, high dispersion is applied to the agglomerated inorganic filler, which is called dispersion mixing, and the inorganic filler is destroyed and refined to make the inorganic filler uniform in the molten resin. Distributed. As a kneading machine for generating such a high shear force, a machine using a stone mortar mechanism or a machine in which a kneading disk with high shear is introduced into a screw element by a same direction twin screw extruder is used. . However, when such a kneader is used, the vapor grown carbon fiber is broken during the kneading step. Further, in the case of a single screw extruder having a weak shearing force, fiber breakage can be suppressed, but fiber dispersion is not uniform. Therefore, in order to achieve uniform dispersion while suppressing fiber breakage, a kneader such as a pressure kneader that does not require high shear and can achieve dispersion over time (long residence time) is used. It is preferable.

  Furthermore, in order to highly fill the inorganic filler in the resin, wetting of the molten resin and the inorganic filler is very important, and the surface of the inorganic filler is renewed during the melt kneading, which corresponds to the interface between the resin and the inorganic filler. It is essential to increase the area. As a kneading machine for that purpose, a normal single-screw extruder or a co-directional twin-screw extruder has a short residence time and high filling is difficult. Furthermore, the vapor grown carbon fiber used in the present invention has a bulk specific gravity of about 0.01 to 0.1, which is very small and fluffy, and is easy to entrain air. Degassing is difficult with a directional twin screw extruder, and high filling is impossible. A batch-type pressure kneader is effective as a kneader capable of high filling and suppressing fiber breakage as much as possible, and was used in the present invention. A material kneaded by a batch type pressure kneader can be put into a single screw extruder and pelletized before solidification.

  In addition, without using a batch-type pressure kneader and a single-screw extruder continuously, the fiber surface can be renewed without applying high shearing force to the fiber, good dispersibility, no internal pressure in the extruder, A reciprocating single-screw extruder (Coperion Bus Co., Ltd.) is a special single-screw extruder that can degas a gas-phase carbon fiber containing a large amount of air and preferably uses a highly-fillable extruder. Connieder) can be used. That is, a method in which a predetermined amount of each component is mixed with a mixer such as a tumbler mixer, the mixture is put into a reciprocating single screw extruder, and pelletized can be used.

The sliding material composition according to the present invention is excellent in mechanical properties, heat resistance, and thermal conductivity. Regarding sliding properties, both the friction coefficient and the wear amount are small, and the limit PV value is very large.
In other words, it means the product of the limit values P and V of the load that melts or seizes when the sliding member exceeds a certain peripheral speed V (cm / sec) at a constant load P (kg / cm ² ). The sliding material composition of the present invention can provide a sliding member having an extremely high value.

Synthetic resin materials generally have a problem that mechanical properties such as heat resistance and rigidity are low compared to metal materials, and heat conduction is low, but the sliding material composition of the present invention has a specific property. By blending vapor grown carbon fiber with less fiber breakage,
(1) Even when a thermoplastic resin is used, the heat distortion temperature can be 160 ° C or higher, preferably 180 ° C or higher, more preferably 200 ° C or higher.
(2) By blending vapor grown carbon fiber, the coefficient of dynamic friction can be easily secured to 0.6 or less, preferably 0.5 or less despite being a synthetic resin. For this reason, the specific wear amount can be kept small.

(3) The thermal conductivity of the vapor grown carbon fiber can be easily achieved at 1 W / mK or higher, preferably 1.8 W / mK or higher, more preferably 2 W / mK or higher by reducing fiber breakage. This is one of the important conditions in order to improve heat dispersion even under high-speed sliding conditions and to prevent the sliding part from becoming hot.
(4) The flexural modulus can also be secured to 4000 Mpa or more, preferably 5000 Mpa or more, more preferably 5500 Mpa or more. This can be used as a relatively heavy load sliding material as a synthetic resin sliding material.

(5) A major feature of the sliding material composition of the present invention is that the fluidity can be maintained high despite the large amount of the specific vapor grown carbon fiber. This is an extremely important property in that the productivity and the molding accuracy of the product can be kept high when molding a sliding member from this composition, and it becomes an extremely excellent material as a sliding material composition. is there.
(6) Since the sliding material composition of the present invention is composed of a synthetic resin and vapor grown carbon fiber in principle, it has the self-lubricating property desired for the sliding member. In addition, it can be used without lubrication, and since it has a small rigidity, it can be prevented from being damaged even if the counterpart material is a soft material such as aluminum.

  Therefore, it can be used for a wide range of applications as a sliding member in automobiles, electrical / electronic fields and the like. When these products are manufactured, conventionally known plastic molding methods can be used. Examples of the molding method include an injection molding method, a hollow molding method, an extrusion molding method, a sheet molding method, a thermoforming method, a rotational molding method, a laminate molding method, and a transfer molding method.

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these ranges.
(Examples 1-9, Comparative Examples 1-8)
Tables 1 and 2 show the formulations of Examples and Comparative Examples. In accordance with these blending conditions, the resin and the conductive filler were melt-kneaded by a method that does not reduce the aspect ratio, and the kneaded product was injection molded to prepare various test pieces (for HDT, for bending test, for heat conduction measurement). . Details of the used resin, conductive filler, kneading conditions, molding conditions, and evaluation method are shown below. Tables 3 and 4 show various test results of the examples and comparative examples.

Kneading method [use equipment]
After melt-kneading with a pressure kneader (mixing capacity 10 liters) manufactured by Toshin Co., Ltd., pelletization was performed using a Tanabe Plastics 30 mmφ single screw extruder.

Molding method (A) Thermoplastic resin Various test pieces were molded using a CYCAP mold clamping force 75-ton injection molding machine manufactured by Sumitomo Heavy Industries, Ltd.
(B) Thermosetting resin Various test pieces were prepared using M-70C-TS manufactured by Meiki Seisakusho Co., Ltd.

Vapor grown carbon fiber (I) VGCF (registered trademark): Vapor grown carbon fiber (fiber diameter 0.1 to 0.2 μm, fiber length 10 μm) manufactured by Showa Denko was used. Bulk specific gravity 0.04, specific surface area 13m ² / g, aspect ratio 70
(B) VGNF (registered trademark): Vapor-grown carbon fiber (fiber diameter 0.08 to 0.12 μm, fiber length 50 μm) manufactured by Showa Denko was used. Bulk specific gravity 0.02, specific surface area 20m ² / g, aspect ratio 500
(C) Vapor grown carbon fiber-H: Vapor grown carbon fiber (fiber diameter 0.1 to 0.2 μm, fiber length 10 μm) manufactured by Showa Denko was used. Bulk specific gravity 0.08, specific surface area 13m ² / g, aspect ratio 70
(D) Vapor-grown carbon fiber pulverized product: The vapor-grown carbon fiber was pulverized with a pulverizer and the aspect ratio was 35. Bulk specific gravity 0.12, specific surface area 14m ² g, aspect ratio 35

Carbon fiber (CF)
Conductive Besfight HTA-C6-SR manufactured by Toho Tenax Co., Ltd. was used. Fiber diameter 7 μm, fiber length 6 mm, specific surface area 2 m ² / g, bulk specific gravity 0.8
Carbon nanotube: CNT (hollow carbon fibril)
A PA66 masterbatch (RMB 4620-00) manufactured by Hyperion Catalysis Co., Ltd. (containing 20% by mass of CNT) was used. Specific surface area 250 m ² / g, fiber diameter 10 nm, fiber length 5 μm

Used plastic (I) Thermoplastic resin Polyamide 66 (PA66): Amilan CM3001 manufactured by Toray Industries, Inc.
Polyphenylene sulfide (PPS): Tosoh Co., Ltd.
(B) Thermosetting resin Allyl ester resin: AA101 manufactured by Showa Denko, viscosity 630000 cps (30 ° C.) Dicumyl peroxide [Nippon Oil & Fats Park Mill D] was used as the organic peroxide.

Evaluation physical properties (A) Sliding characteristics: Using a thrust wear tester manufactured by Toyo Seiki Co., Ltd., the counterpart material aluminum was used to evaluate the dynamic friction coefficient and the wear amount. As the test sample, a flat plate having a thickness of 100 × 100 × 2 mm was cut and used. The amount of wear of the aluminum material was measured after 2 hours of measurement.
(B) Thermal deformation temperature HDT (large load): compliant with ASTM D-648.
(C) The flexural modulus was based on ASTM D-790.

(D) Thermal conductivity: Measured by a hot wire method using a rapid thermal conductivity meter manufactured by Kyoto Electronics Industry Co., Ltd. As the test sample, five flat plates each having a thickness of 100 × 100 × 2 mm were used.
(E) Aspect ratio of carbon fiber contained in the molded product: heat treatment was performed at 600 ° C. in an inert gas (argon) furnace, and the remaining fibrous material was observed and measured with an electron microscope (SEM).
(F) Critical PV value: The wear rate was fixed at 30 cm / sec, the load was changed, and after 2 hours of operation, the friction surface was observed and judged.
(G) Fluidity of the composition: MI (melt index) was measured. In the case of PPS resin, the flow rate of the composition was measured at 320 ° C., in the case of PA66 resin at 280 ° C., and in the case of allyl ester resin at 60 ° C. under a load of 2.16 kg for 10 minutes.
(H) Breaking rate of carbon fiber (%): Ratio of the aspect ratio of the carbon fiber before mixing and kneading to the aspect ratio of the carbon fiber of the composition molded product.
Carbon fiber breaking rate (%) = {1− (aspect ratio of carbon fiber of composition molded product /
Carbon fiber aspect ratio before mixing and kneading)} × 100

  Carbon fiber resin composite materials are often used mainly for the purpose of improving mechanical properties, and have been used in a wide range of fields such as aerospace, automobiles, sports, and industrial materials. The carbon fibers used as these fiber fillers are mainly baked acrylic fibers or pitch fibers. Although composite materials using such carbon fibers have excellent mechanical properties and heat resistance, they are poor in fluidity and unsatisfactory in wear resistance, so when used as sliding members for various industries, they are produced. It lacks in accuracy and precision, has a short service life, and does not always give desirable results even when put to practical use. Furthermore, in general, the mating material of the sliding member is generally steel, but in the future, there is a tendency to use a soft and lightweight material such as aluminum, but the sliding member from the sliding material composition of the present invention is Since this is not hurt, it can be used safely.

Dependence of dynamic friction coefficient and gas phase carbon fiber content.

Claims (10)

And the matrix synthetic resin, fiber diameter: 50 to 200 nm, aspect ratio: 40 to 1000, 1580 cm ^-1 and peak intensity ratio of 1360 cm ^-1 of the Raman scattering spectrum _{(I 0 = I 1360 / I} 1580): 0.1~1 A sliding material composition characterized in that the heat distortion temperature of ASTM D 648 heavy load is 160 ° C. or higher, kneaded with vapor-grown carbon fiber.   The sliding material composition of Claim 1 which mix | blended 10 mass%-70 mass% of vapor grown carbon fiber.   The sliding material composition according to claim 1, wherein the thermal conductivity is 1 W / mK or more.   The sliding material composition according to any one of claims 1 to 3, wherein the flexural modulus is 4000 MPa or more. Thermoplastic resin and fiber diameter: 50 to 200 nm, aspect ratio: 40 to 1000, 1580 cm ^-1 and peak intensity ratio of 1360 cm ^-1 of the Raman scattering spectrum _{(I 0 = I 1360 / I} 1580): 0.1~1, Bulking specific gravity: A sliding material composition characterized by kneading a vapor grown carbon fiber of 0.01 to 0.1 without limiting the breaking rate of the carbon fiber to 20% or less and applying a high shearing force. Manufacturing method.   6. The production of the sliding material composition according to claim 5, wherein when the thermoplastic resin and the vapor grown carbon fiber are kneaded, 10 mass% to 70 mass% of the vapor grown carbon fiber is blended in the composite composition. Method.   When kneading a thermoplastic resin and vapor-grown carbon fiber, the fracture rate of the carbon fiber is suppressed to 20% or less, and after melt-kneading with a pressure kneader, a single screw extruder or a reciprocating single screw extruder The manufacturing method of the sliding material composition of Claim 5 or 6 pelletized by.   The sliding material composition manufactured by the manufacturing method of the sliding material composition according to any one of claims 5 to 7, wherein the non-defective product ratio is 95% or more when the mold temperature is cooled for 5 seconds. A method for producing a sliding material molded body, characterized by molding at a temperature 20 to 40 ° C higher than the temperature at the time of injection molding.   The sliding synthetic resin molding using the resin composition manufactured by the manufacturing method of the sliding material composition of any one of Claims 5-7.   The non-lubricating sliding material using the resin composition manufactured by the manufacturing method of the sliding material composition of any one of Claims 5-7.

Images