JP2000319472A - Resin composition for slidable member and slidable member using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for a slidable member which shows excellent friction and abrasion properties even when it is used under many different conditions such as an in-oil or lubricating condition or the like, and also provide a slidable member using the same. SOLUTION: This resin composition for a slidable member comprises 5 to 40 wt.% of barium sulfate, 1 to 30 wt.% of phosphate, 1 to 10 wt.% of one or not less than 2 of resins selected from a polyimide resin, a fired phenolic resin and a polyphenylene sulphone resin and a tetrafluoroethylene resin as a residual component. A slidable member is obtained by filling the resin composition in a pore of a sintered porous metal and on a surface thereof formed on a back side of steel for covering or by filling the resin in a metal network and on a surface thereof for covering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for a sliding member having excellent friction and wear characteristics and a sliding member using the same.

[0002]

2. Description of the Related Art Conventionally, ethylene tetrafluoride resin (hereinafter "PT
FE ”) is excellent in self-lubricating properties, has a low coefficient of friction, and has chemical resistance and heat resistance.
Widely used for sliding members such as bearings.

However, a sliding member made of PTFE alone is inferior in abrasion resistance and load resistance. Therefore, (a) a solid lubricant such as graphite or molybdenum disulfide and / or glass is used depending on the use of the sliding member. A reinforcing material such as fiber or carbon fiber is contained in PTFE, (b) a porous metal sintered layer lined with a steel backing is filled and coated with PTFE, and (c) a mesh of a metal network is formed. In addition, the surface is filled with PTFE to cover the above disadvantages.

The sliding member having the above-mentioned embodiment (b) is a so-called multi-layer sliding member. For example, US Pat. No. 2,689,380 (1954);
No. 1-2452, Japanese Patent Publication No. 39-16950,
It is disclosed in Japanese Patent Publication No. 41-1868. These publications disclose a multi-layer sliding member in which the pores and the surface of a porous metal sintered layer lined with a steel backing are filled and covered with PTFE containing a filler made of PTFE or lead or lead oxide. I have.

[0005] The sliding member having the mode (c) is disclosed in, for example, Japanese Patent Publication No. 55-23740. This publication discloses a self-lubricating lining foil made of a material including a metal fabric, a fluoroplastic, and a reinforcing material of an inorganic fiber.

[0006]

For the above-mentioned various sliding members, fillers are selected in accordance with many different use conditions, for example, dry friction conditions or oil-in-oil or oil lubrication conditions. Therefore, it is difficult to say that the sliding member satisfies all the use conditions.

[0007] PTFE compositions for sliding members are used as fillers for many engineering plastics, such as graphite, molybdenum disulfide or other metal sulfides, metal oxides, glass fiber or carbon. Attempts have been made to use inorganic fibers such as fibers, but these fillers may contribute to improving the wear resistance of the resin layer, but often impede the low friction properties inherent to PTFE. Raise the problem. In particular, lead as a filler has been widely used to improve the wear resistance of the sliding layer, but in recent years environmental pollution, pollution, etc. have to be abandoned from the secondary viewpoint. Under circumstances.

The present invention has been made in view of the above circumstances, and has as its object to provide a sliding member having excellent friction and wear characteristics even under many different use conditions such as dry friction conditions or oil-in-oil or oil lubrication conditions. An object of the present invention is to provide a resin composition for a member and a sliding member using the same.

[0009]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, have found that a resin composition is applied to the pores and the surface of a porous metal sintered layer formed on a steel backing metal. In a sliding member formed by filling and coating, or by filling and coating a resin composition covering the mesh and surface of a metal mesh, barium sulfate, phosphate, and a polyimide resin are added to PTFE as a resin composition. A sliding member using a specific amount or a specific amount of graphite further exhibits excellent friction and wear characteristics under many different use conditions such as dry friction conditions or oil-in-oil or oil lubrication conditions. The knowledge that it can be demonstrated was obtained. The present invention has been completed based on such knowledge, and the gist of each invention is as follows.

A first gist of the present invention is to provide barium sulfate 5 to
40% by weight, 1 to 30% by weight of a phosphate, one or more resins selected from a polyimide resin, a calcined phenol resin and a polyphenylene sulfone resin.
% By weight, with the balance being a resin composition for a sliding member comprising an ethylene tetrafluoride resin.

A second feature of the present invention is that a porous metal sintered layer formed on a steel backing metal has a pore and a surface filled and coated with a resin composition. A sliding member formed by filling and covering the mesh and the surface with the resin composition, wherein the resin composition layer is made of barium sulfate 5
-40% by weight, phosphate 1-30% by weight, one or more resins selected from polyimide resin, calcined phenol resin and polyphenylene sulfone resin
% By weight, with the balance being a sliding member made of ethylene tetrafluoride resin.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
First, the resin composition for a sliding member of the present invention will be described. In the present invention, PTF which is a main component of the resin composition
Examples of E mainly include fine powders such as “Teflon 6CJ (trade name)” manufactured by DuPont Mitsui Fluorochemicals, “Polyflon F201 (trade name)” manufactured by Daikin Industries, and “Fluon CD-076 (trade name) manufactured by Asahi Glass Co., Ltd. "Product name)" and "FULL-ON CD-1 (product name)".

Further, a molding powder, such as "Teflon 7AJ (trade name)" manufactured by Du Pont-Mitsui Fluorochemicals, may be used in the fine powder at a ratio of 20% by weight or less based on the resin composition.
The blending amount of PTFE in the resin composition is the remaining amount obtained by subtracting the blending amount of the filler from the amount of the resin composition.

Barium sulfate (BaSO ₄ ) as a filler of the resin composition of the present invention is composed of PTFE as the main component.
To eliminate the drawback of poor wear resistance and load resistance of PTFE alone, and to greatly improve the wear resistance and load resistance. The effect of the barium sulfate content is particularly noticeable under the use condition of the low load side of the sliding member.

The barium sulfate may be either precipitated or elutriated barium sulfate. Such barium sulfate is
For example, it is commercially available from Sakai Chemical Industry Co., Ltd. and can be easily obtained. The average particle size of barium sulfate is generally 10 μm or less, preferably 1 to 5 μm. The compounding amount of barium sulfate is 5 to 40% by weight, preferably 10 to 30% by weight, and more preferably 15 to 25% by weight.

The phosphate as a filler of the resin composition of the present invention is not itself a lubricating substance such as a solid lubricant such as graphite or molybdenum disulfide. In the sliding with the mating material, it promotes the film forming property of the PTFE lubricating film on the mating material surface (sliding surface), and exerts an effect on the improvement of the sliding characteristics such as low friction property and wear resistance. .

In the present invention, examples of the phosphate include metal salts such as diphosphoric acid, tertiary phosphoric acid, pyrophosphoric acid, phosphorous acid, and metaphosphoric acid, and mixtures thereof. Among these, metal salts of secondary phosphoric acid, tertiary phosphoric acid and pyrophosphoric acid are preferred. As the metal, an alkali metal and an alkaline earth metal are preferable, and lithium (Li) and calcium (Ca) are particularly preferable.

Specifically, trilithium phosphate (Li)₃P
O₄), Lithium hydrogen phosphate (Li ₂HPO₃), Piro
Lithium phosphate (Li₄P₂O₇), Tricalcium phosphate
(Ca₃(PO₄)₂), Calcium pyrophosphate (C
a₂P₂O₇), Calcium hydrogen phosphate (CaHP)
O₄), Etc., and especially calcium pyrophosphate is
Most preferred as the phosphate used in the present invention.

By adding a small amount, for example, 1% by weight, of phosphate to PTFE, the effect of promoting the film forming property of the lubricating film described above starts to appear, and the effect is maintained up to 30% by weight. However, if the content exceeds 30% by weight, the amount of the lubricating film formed on the surface of the mating material becomes too large, and the wear resistance is rather lowered. Therefore, the content of the phosphate is 1 to 30% by weight, preferably 5 to 30% by weight.
-25% by weight, more preferably 10-20% by weight.

The polyimide resin, the calcined phenol resin and the polyphenylene sulfone resin as the filler of the resin composition of the present invention contribute to the improvement of wear resistance and heat resistance. The effect is remarkable under the use condition of the high load side of the member. Also,
These resins compensate for the above-mentioned drawbacks of barium sulfate under the conditions of use on the high load side, and allow the sliding member to be used in a wide range of use conditions by being blended with the above-described barium sulfate.

Examples of the polyimide resin include aromatic polyimide resins such as “P84 polyimide (trade name)” manufactured by RENSING Co., Ltd., and thermosetting polyimide resins such as “bismaleimide (trade name)” manufactured by Ciba-Geigy, and Mitsui Chemicals. “Tecmite (trade name)” and “Carbodiimide (trade name)” manufactured by Nisshinbo Industries Co., Ltd. are selected and used.

The baked phenolic resin is a phenol-formaldehyde resin in the form of granules in an inert atmosphere at 400 ° C.
Carbonized by firing at a high temperature of 2200 ° C., for example, “Belle Pearl C-800 (trade name)” manufactured by Kanebo Co., Ltd.
"Bellpearl C-2000 (trade name)" may be mentioned.

The polyphenylene sulfone resin is a polymer mainly composed of a repeating structural unit represented by the following formula (1), and a proportion of the structural unit represented by the following formula (2) in the structural unit is 60% or more. It is a polymer.

[0024]

Embedded image

In the formula (1), X is 0, 1 or 2. Specifically, “Ceramer” manufactured by Hoechst
(Product name). "

The above-mentioned polyimide resin, calcined phenol resin and polyphenylene sulfone resin are used alone or in combination of two or more. The compounding amount is 1 to 10% by weight, preferably 1 to 7% by weight, more preferably 2 to 10% by weight.
5% by weight.

In the present invention, a solid lubricant selected from graphite and molybdenum disulfide is added to the resin composition having the above-mentioned component composition in an amount of 5% by weight or less, preferably 0% by weight, for the purpose of further improving abrasion resistance. 0.5 to 3% by weight, more preferably 0.5 to 2% by weight.

Next, the sliding member of the present invention and a method of manufacturing the same will be described. First, a multi-layer sliding member (I) using a base metal composed of a back metal made of a thin steel plate and a porous metal sintered layer lined with the back metal, and a method of manufacturing the same will be described. A rolled steel sheet for general structure is used as the back metal forming the base material. The steel sheet is preferably used as a continuous strip provided as a hoop material by being wound in a coil shape,
The strip is not necessarily limited to a continuous strip, and a strip cut to an appropriate length can be used. These strips may be copper-plated or tin-plated as required to improve corrosion resistance.

The metal powder forming the porous metal sintered layer is as follows:
The metal itself, such as bronze, lead bronze, or phosphor bronze, which has excellent friction and wear characteristics, is used. A copper alloy powder that passes through approximately 100 mesh is used. Depending on the purpose, other than a copper alloy, for example, an aluminum alloy, iron, etc. May also be used. The particle form of the metal powder may be a lump, spherical or irregular shape. This porous metal sintered layer
It must be firmly bonded to the alloy powder and the strip such as the steel plate, and have a certain thickness and a required porosity. The thickness of the porous metal sintered layer is generally about 0.15 to 0.40 mm, preferably 0.2 to 0.3 mm, and the porosity is about 10% by volume or more, especially about 15 to It is recommended to be 40% by volume.

The resin composition is obtained by mixing PTFE and the above-mentioned fillers, then adding the resulting mixture to a petroleum-based solvent and stirring and mixing to obtain a wettable resin composition. . The mixture of PTFE and filler is PTF
The transition temperature of E at room temperature (19 ° C.) or lower, preferably 10 to 18
C., and the resulting mixture and the petroleum-based solvent are stirred and mixed at the same temperature as described above. By adopting such a temperature condition, fibrous formation of PTFE is prevented, and a uniform mixture can be obtained.

As petroleum solvents, naphtha, toluene,
In addition to xylene, a mixed solvent with an aliphatic solvent or a naphthenic solvent is used. The ratio of petroleum solvents used is P
15 parts per 100 parts by weight of the mixture of TFE powder and filler
To 30 parts by weight. When the use ratio of the petroleum solvent is less than 15 parts by weight, the spreadability of the wettable resin composition is poor in the step of filling and coating the porous metal sintered layer described below, and as a result, Unevenness is likely to occur in the filling coating on the layer. On the other hand, when the use ratio of the petroleum solvent exceeds 30 parts by weight, not only the filling and coating work becomes difficult, but also the uniformity of the coating thickness of the resin composition is impaired, or the resin composition and the sintered layer The adhesion strength with the adhesive becomes poor.

The sliding member (I) of the present invention comprises the following (a)
To (d).

(A) A resin composition imparted with wettability is sprayed and supplied on a porous metal sintered layer formed on a back metal made of a thin steel plate, and is rolled by a roller to form a resin composition on the sintered layer. And a coating layer made of a resin composition having a uniform thickness is formed on the surface of the sintered layer. In this step, the thickness of the coating layer is 2 to 2.2 times the thickness of the coating layer required for the final product of the resin composition. Most of the filling of the resin composition into the pores of the porous metal sintered layer proceeds in this step.

(B) The petroleum-based solvent is removed by holding the back metal treated in the above step (a) in a drying furnace heated to a temperature of 200 to 250 ° C. for several minutes, and then the dried resin The composition is subjected to a pressure roller treatment under a pressure of 300 to 600 kgf / cm ² so as to have a predetermined thickness by a roller.

(C) The back metal treated in the above step (b) is introduced into a heating furnace, heated at a temperature of 360 to 380 ° C. for several minutes to several tens of minutes, baked, taken out of the furnace, and again. Adjust the dimensional variation by roller processing.

(D) The back metal whose dimensions have been adjusted in the step (c) is cooled (air-cooled or naturally cooled), and then, if necessary, a straightening roller treatment is performed to correct the undulation of the back metal. A sliding member.

In the sliding member obtained through the above steps (a) to (d), the porous metal sintered layer has a thickness of 0.10
0.40 mm, and the thickness of the coating layer formed from the resin composition is 0.02 to 0.15 mm. The sliding member obtained in this manner is cut into an appropriate size and used as a sliding plate in a flat state, and is also rounded and used as a cylindrical wound bush.

Next, the sliding member (II) of the present invention using a substrate made of a metal mesh and a method for producing the sliding member will be described. As the metal mesh forming the base material, (i) a fixed lower mold having a straight blade and a movable upper mold having a corrugated, trapezoidal, triangular or other blade fixed with a thin metal plate. Into the metal sheet at right angles to the blade of the fixed type or in the oblique direction to the blade of the fixed lower die. (Ii) a woven wire mesh formed by weaving a fine metal wire as a warp and a weft, (iii) a braided wire mesh formed by knitting a fine metal wire, and the like.

The expanded metal has a thickness of 0.3
It is preferable that a metal sheet having a thickness of 0.1 mm to 1.5 mm and a thickness of 0.1 mm to 1.0 mm is formed by subjecting a thin metal plate having a thickness of 0.1 mm to 1.5 mm to an expanding process. As the woven wire mesh or the braided wire mesh, a fine metal wire having a wire diameter of 0.1 to 0.5 mm is 10 to 10 mm.
A mesh formed by weaving or knitting a mesh of 0 mesh is preferable.

As the metal material forming the expanded metal, woven or braided wire mesh, a thin plate or a thin wire of stainless steel, copper, phosphor bronze, bronze, iron or the like is preferable.

The sliding member (II) of the present invention is manufactured through the following steps (a) to (c). The resin composition is the same as that described in the method for manufacturing the sliding member (I). The same resin composition as the resin composition is used.

(A) A resin composition is scattered and supplied onto a metal mesh made of expanded metal, woven or braided wire mesh, and is rolled with a roller to fill the mesh of the metal mesh with the resin composition and to form a metal mesh. A coating layer made of a resin composition having a uniform thickness is formed on the surface of the body. In this step, the thickness of the coating layer is set to be 2 to 2.5 times the coating thickness required for the final composition of the resin composition.

(B) The petroleum-based solvent was removed by holding the metal net treated in the above step (a) in a drying furnace heated to a temperature of 200 to 250 ° C. for several minutes, and then dried. The resin composition is subjected to a pressure roller treatment under a pressure of 300 to 600 kgf / cm ² so as to have a predetermined thickness by a roller.

(C) After the metal net treated in the above step (b) is introduced into a heating furnace and heated at a temperature of 360 to 380 ° C. for several minutes to several tens minutes, the resin composition is fired. Then, it is taken out of the furnace, and the dispersion of the dimensions is adjusted again by a roller treatment to obtain a desired sliding member.

In the sliding member obtained through the above steps (a) to (c), the thickness of the coating layer made of the resin composition formed on the surface of the metal mesh is usually 0.05 to 0.05. 1.
0 mm. The sliding member thus obtained is
It is cut into appropriate dimensions and used as a sliding plate in a flat state, and is also bent and used as a cylindrical wound bush.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof. In the following example, the sliding characteristics of the sliding member (I) are as follows:
According to the test methods (2), (3) and (4),
The sliding characteristics of the sliding member (II) were evaluated by the test method of (2).

Thrust test (1): The friction coefficient and the amount of wear were measured under the conditions shown in Table 1. The coefficient of friction indicates the coefficient of friction at the time of stability after one hour from the start of the test until the end of the test, and the amount of wear indicates the dimensional change of the sliding surface after eight hours of the test. Indicated by

[0048]

[Table 1] Sliding speed 20m / min Load 20kgf / cm²  Test time 8 hours Lubrication No lubrication Counterpart material Carbon steel for machine structure (S45C)

Thrust test (2): The friction coefficient and wear amount were measured under the conditions shown in Table 2. The coefficient of friction indicates the coefficient of friction at the time of stability after one hour from the start of the test until the end of the test, and the amount of wear indicates the dimensional change of the sliding surface after eight hours of the test. Indicated by

[0050]

[Table 2] Sliding speed 10m / min Load 100kgf / cm²  Test time 8 hours Lubrication No lubrication Counterpart material Carbon steel for machine structure (S45C)

Reciprocating sliding test (3): The friction coefficient and the wear amount were measured under the conditions shown in Table 3. The coefficient of friction indicates the coefficient of friction at the time of stability after one hour from the start of the test until the end of the test. The amount of wear indicates the dimensional change of the sliding surface after eight hours of the test. Indicated by

[0052]

[Table 3] Sliding speed 5m / min Load 50kgf / cm²  Test time 8 hours Lubrication Lubricating oil (ATF-DII manufactured by Idemitsu Kosan Co., Ltd.) Counterpart material Carbon steel for machine structure (S45C)

Reciprocating sliding test (4): The friction coefficient and the wear amount were measured under the conditions shown in Table 4. The coefficient of friction indicates the coefficient of friction at the time of stability after one hour from the start of the test until the end of the test, and the amount of wear indicates the dimensional change of the sliding surface after eight hours of the test. Indicated by

[0054]

[Table 4] Sliding speed 5m / min Load 100kgf / cm²  Test time 8 hours Lubrication Lubricating oil (ATF-DII manufactured by Idemitsu Kosan Co., Ltd.) Counterpart material Carbon steel for machine structure (S45C)

Examples 1 to 20 and Comparative Examples 1 to 3 In the following examples, PTFE was used as "polyflon F
201 (trade name) (manufactured by Daikin Industries, Ltd.), and as a petroleum-based solvent, a mixed solvent of an aliphatic solvent and a naphthene-based solvent (trade name “EXSOL” manufactured by Exxon Chemical Co., Ltd.) was used.

First, PTFE and the fillers shown in Tables 5 to 10 were supplied into a Henschel mixer and agitated and mixed, and 100 parts by weight of the obtained mixture was mixed with 20 parts of a petroleum-based solvent.
Parts by weight, and the temperature (1) below the room temperature transition point of PTFE.
(5 ° C.) to obtain a resin composition.

The obtained resin composition is sprayed and supplied on a porous metal (bronze) sintered layer (thickness 0.25 mm) formed on a steel backing (thickness 0.70 mm) made of a thin metal plate.
Rolling was performed using a roller so that the thickness of the resin composition became 0.25 mm, thereby obtaining a multilayer plate in which the pores and the surface of the sintered layer were filled and covered with the resin composition. The obtained multilayer plate was kept in a hot-air drying oven heated to a temperature of 200 ° C. for 5 minutes to remove the solvent, and then the dried resin composition layer was pressed with a roller by a pressing force of 4 mm.
Rolling was performed at 00 kgf / cm ^{2 to set} the thickness of the resin composition layer coated on the sintered layer to 0.10 mm.

Next, the multi-layer plate subjected to the pressure treatment was heated in a heating furnace for 3 hours.
After overheating and baking at 70 ° C. for 10 minutes, pressure treatment was again performed with a roller, and dimensional adjustment and swelling correction were performed to produce a multilayer sliding member. The corrected multi-layer sliding member was cut to obtain a multi-layer sliding member test piece having a side of 30 mm. FIG. 1 is a cross-sectional view showing the multilayer sliding member obtained in this manner. In the drawing, reference numeral 1 denotes a steel backing metal, 2 denotes a porous metal sintered layer lined with a steel backing metal, and 3 denotes a porous metal sintered layer. Coating layer (sliding layer) made of a resin composition in which pores and surfaces of the porous metal sintered layer 2 are filled and coated.

Tables 5 to 10 show the results of the thrust tests (1) and (2) of each multilayer sliding member. In addition, the compounding ratio in the table is shown by weight%, and the types used for barium sulfate, phosphate, polyimide resin and solid lubricant are shown by ○. "Bellpearl C-2000 (trade name)" (manufactured by Kanebo Co., Ltd.) is used as the calcined phenol resin.
(Trade name) "(manufactured by Hoechst). (Below)

[0060]

[Table 5]Example 1 2 3 4  PTFE 73 72.5 72.5 69.5 Barium sulfate 15 15 15 18 Precipitation elutriation ○ ○ ○ ○ Phosphate 10 10 10 10 Calcium pyrophosphate ○ ○ ○ Calcium hydrogen phosphate ○ Polyimide resin 2 2 2 2 Aromatic thermosetting ○ ○ ○ ○ Solid lubricant-0.5 0.5 0.5 Graphite ○ ○ ○ Molybdenum disulfide thrust test (1) Friction coefficient (× 10^-211.5 11 13 12 Amount of wear (μm) 5 4 8 5 Thrust test (2) Friction coefficient (× 10^-2) 7 7 8.5 7.5 Wear (μm) 14 12 16 12  (Below)

[0061]

[Table 6]Example 5 6 7 8  PTFE 69 69 72 71.5 Barium sulfate 18 18 20 20 Precipitation ○ Elutriation ○ ○ ○ Phosphate 10 10 5 5 Calcium pyrophosphate ○ ○ ○ Calcium hydrogen phosphate ○ Polyimide resin 2.5 2.5 3 3 Aromatic thermosetting ○ ○ ○ ○ Solid lubricant 0.5 0.5-0.5 Graphite ○ ○ Molybdenum disulfide ○ Thrust test (1) Friction coefficient (× 10^-2) 14 15 15 13 Abrasion (μm) 5 6 4 4 Thrust test (2) Friction coefficient (× 10^-2) 7.5 8 9 8 Wear (μm) 12 14 17 13  (Below)

[0062]

[Table 7]Example 9 10 11 12  PTFE 68 67.5 67.5 65 Barium sulfate 20 20 20 20 Precipitation elutriation ○ ○ ○ ○ Phosphate 10 10 10 10 Calcium pyrophosphate ○ ○ ○ Calcium hydrogen phosphate ○ Polyimide resin 2 2 2 4 Aromatic ○ ○ Thermosetting ○ ○ Solid lubricant-0.5 0.5 1 Graphite ○ ○ Molybdenum disulfide ○ Thrust test (1) Friction coefficient (× 10^-2) 14 12 13 14 Amount of wear (μm) 3 5 6 4 Thrust test (2) Friction coefficient (× 10^-2) 7.5 7.5 8 7.5 Wear (μm) 13 13 15 10  (Below)

[0063]

[Table 8]Example 13 14 15  PTFE 67 66 62 Barium sulfate 25 25 25 Sedimentation elutriation ○ ○ ○ Phosphate 5 5 10 Calcium pyrophosphate ○ ○ ○ Calcium hydrogen phosphate Polyimide resin 3 3 3 Aromatic thermosetting ○ ○ ○ Solid lubricant-1-Graphite ○ Molybdenum disulfide thrust test (1) Friction coefficient (× 10^-2) 14 16 15 Abrasion amount (μm) 36 2 Thrust test (2) Friction coefficient (× 10^-2) 8.5 8 9 Wear (μm) 16 14 9  (Below)

[0064]

[Table 9]Example 16 17 18 19 20  PTFE 70 69 68 67.5 70.5 Barium sulfate 15 15 18 18 15 Precipitation elutriation ○ ○ ○ ○ ○ Phosphate 10 10 10 10 10 Calcium pyrophosphate ○ ○ ○ ○ ○ Calcium hydrogen phosphate Polyimide resin----2 Aromatic Thermosetting ○ Calcined phenolic resin 5 5 − − − Polyphenylene sulfone resin − − 4 4 2 Solid lubricant − 1 − 0.5 0.5 Graphite ○ ○ ○ Molybdenum disulfide Thrust test (1) Friction coefficient (× 10^-2) 12 12 13 12 13 Wear (μm) 3 3 4 3 4 Thrust test (2) Friction coefficient (× 10^-2) 7 7 8 7 9 Wear (μm) 17 16 13 12 13  (Below)

[0065]

[Table 10]Comparative example one two Three  PTFE 50 70 80 Barium sulfate---Precipitation elutriation phosphate-10-Calcium pyrophosphate ○ Calcium hydrogen phosphate Polyimide resin--20 Aromatic ○ Thermosetting Lead 50 20-Thrust test (1) Coefficient of friction (× 10^-2) 14 16 19 Wear (μm) 31 8 12 Thrust test (2) Friction coefficient (× 10^-2) * 11 10 Wear (μm) * 85 20  Note: * cannot be measured because the friction coefficient sharply increased 2 hours after the start of the test and the test was stopped.

From the above test results, it can be seen that the multilayer sliding member of the embodiment of the present invention exhibits stable performance throughout the test time, has a very small amount of wear, and has excellent sliding characteristics. there were. On the other hand, the multilayer sliding member of the comparative example, particularly the multilayer sliding members of Comparative Example 2 and Comparative Example 3, did not show a large difference in the coefficient of friction from the multilayer sliding member of the example. The amount was large and the sliding characteristics were poor.

Next, Embodiments 1, 2, 4, 7,
8, 9, 10, 12, 13, 14, 16, 17, 18,
After cutting the multilayer boards of Examples 19 and 20 and Comparative Examples 2 and 3, bending was performed with the coating layer inside and a radius of 20.0.
mm, a length of 20.0 mm, and a thickness of 1.05 mm, a semi-cylindrical multilayer sliding member test piece was prepared. Tables 11 to 14 show the results of the reciprocating motion tests (3) and (4) of each multilayer sliding member.

[0068]

[Table 11]Example 1 2 4 7 8  Reciprocating motion test (3) Coefficient of friction (× 10^-3) 26 24 20 26 25 Wear (μm) 6 5 2 4 3  Reciprocating motion test (4) Friction coefficient (× 10^-3) 36 35 26 30 28 Wear (μm) 8 5 4 6 5  (Below)

[0069]

[Table 12]Example 9 10 12 13 14  Reciprocating motion test (3) Coefficient of friction (× 10^-3) 21 23 25 28 26 Wear (μm) 2 3 5 5 4  Reciprocating motion test (4) Friction coefficient (× 10^-3) 29 28 30 33 30 Wear (μm) 4 4 6 6 5

[0070]

[Table 13]Example 16 17 18 19 20  Reciprocating motion test (3) Coefficient of friction (× 10^-3) 31 29 27 28 27 Amount of wear (μm) 4 4 3 4 3  Reciprocating motion test (4) Friction coefficient (× 10^-3) 35 38 30 33 32 Wear (μm) 6 6 5 3 5  (Below)

[0071]

[Table 14]Comparative example twenty three  Reciprocating motion test (3) Coefficient of friction (× 10^-3) 100 28 Wear (μm) 48 7  Reciprocating motion test (4) Friction coefficient (× 10^-3) * 51 Wear (μm) * 18  Note: * indicates that the test was stopped 30 minutes after the start of the test because the coefficient of friction increased sharply.

From the above test results, it was found that the multi-layer sliding member of the example of the present invention exhibited a very low coefficient of friction throughout the test time, was stable, and had a very small amount of wear.

Examples 21 to 33 and Comparative Examples 4 to 6 In the following examples, PTFE was used as "Polyflon F20".
1 (trade name) (manufactured by Daikin Industries, Ltd.), and as a petroleum-based solvent, a mixed solvent of an aliphatic solvent and a naphthene-based solvent (trade name "EXSOL" manufactured by Exxon Chemical Co., Ltd.) was used.

First, PTFE and the fillers shown in Tables 15 to 18 were supplied into a Henschel mixer and mixed by stirring, and 100 parts by weight of the obtained mixture was mixed with a petroleum solvent 20%.
Parts by weight, and the temperature (1) below the room temperature transition point of PTFE.
(5 ° C.) to obtain a resin composition.

The phosphor bronze plate having a thickness of 0.30 mm is subjected to an expanding process to produce a 0.43 mm-thick expanded metal having a regular mesh having a square shape of 0.6 mm on each side (strand). Substrate A was used. Also,
A woven wire mesh having a mesh of 50 mesh was produced using a phosphor bronze fine wire having a wire diameter of 0.3 mm for the weft and the warp, and this was used as a base material B.

The above-mentioned resin composition is supplied onto a substrate made of expanded metal and a substrate made of woven wire mesh, respectively, and is rolled with a roller to fill the mesh of the substrate with the resin composition and to form a surface of the substrate. After forming a coating layer of the resin composition on the substrate, the mixture was kept in a hot-air drying furnace heated to a temperature of 220 ° C. for 5 minutes to remove the solvent in the resin composition. Then, the base material whose mesh and surface are filled and coated with the resin composition is heated and baked in a heating furnace at a temperature of 360 ° C. for 10 minutes, and then subjected to a pressure treatment with a roller to perform dimensional adjustment and correction of waviness and the like. A base material on which a coating layer having a thickness of 0.13 mm was formed was prepared. The substrate after straightening was cut to obtain a slide plate test piece having a side of 30 mm.

FIG. 2 is a plan view showing an expanded metal,
FIG. 3 is a cross-sectional view showing a sliding member based on the expanded metal shown in FIG. 2, in which reference numeral 4 denotes expanded metal, 5 denotes sides (strands), 6 denotes mesh, and 7 denotes expanded metal mesh. And a coating layer (sliding layer) made of a resin composition whose surface is filled and coated. FIG. 4 is a cross-sectional view showing a sliding member using a woven wire mesh as a base material. In the figure, reference numeral 8 denotes a woven wire mesh, and 9 denotes a resin filled and coated on the mesh and the surface of the mesh 8. It is a coating layer (sliding layer) made of the composition.

Tables 15 to 18 show the results of the thrust test (2) for each sliding member. The blending ratio in the table is% by weight.
The types used for barium sulfate, phosphate, polyimide resin and solid lubricant are indicated by ○.
Further, as the calcined phenol resin, "Bellpearl C-2"
000 (trade name) "(manufactured by Kanebo) and" Ceramer (trade name) "(H
oechst). (Below)

[0079]

[Table 15]Example 21 22 23 24  PTFE 73 73 69.5 69.5 Barium sulfate 15 15 18 18 Precipitation elutriation ○ ○ ○ ○ Phosphate 10 10 10 10 Calcium pyrophosphate ○ ○ ○ ○ Calcium hydrogen phosphate Polyimide resin 2 2 2 2 Aromatic thermosetting ○ ○ ○ ○ Solid lubricant--0.5 0.5 Graphite ○ ○ Molybdenum disulfide Substrate type A B A B Thrust test (2) Friction coefficient (× 10^-2) 7 7 7 8 Wear (μm) 12 13 11 12  (Below)

[0080]

[Table 16]Example 25 26 27 28  PTFE 68 67.5 66 62 Barium sulfate 20 20 20 25 Precipitation elutriation ○ ○ ○ ○ Phosphate 10 10 10 10 Calcium pyrophosphate ○ ○ ○ ○ Calcium hydrogen phosphate Polyimide resin 2 2 4 3 Aromatic thermosetting ○ ○ ○ ○ Solid lubricant-0.5--Graphite ○ Molybdenum disulfide Base material type A A A B Thrust test (2) Friction coefficient (× 10^-2) 8 8 9 8 Wear (μm) 13 11 10 11  (Below)

[0081]

[Table 17]Example 29 30 31 32 33  PTFE 70 69 68 67.5 70.5 Barium sulfate 15 15 18 18 15 Precipitation elutriation ○ ○ ○ ○ ○ Phosphate 10 10 10 10 10 Calcium pyrophosphate ○ ○ ○ ○ ○ Calcium hydrogen phosphate Polyimide resin----2 Aromatic Thermosetting ○ Calcined phenolic resin 5 5 − − − Polyphenylene sulfone resin − − 4 4 2 Solid lubricant − 1 − 0.5 0.5 Graphite ○ ○ ○ Molybdenum disulfide Substrate type A B B A A Thrust test (2) Friction coefficient ( × 10^-2) 7 7 8 7 9 Wear (μm) 15 14 13 13 13  (Below)

[0082]

[Table 18]Comparative example 4 5 6  PTFE 70 70 80 Barium sulfate---Precipitation elutriation phosphate 10 10-Calcium pyrophosphate ○ ○ Calcium hydrogen phosphate Polyimide resin--20 Aromatic thermosetting ○ Lead 20 20-Substrate type ABA Thrust test ( 2) Friction coefficient (× 10^-2) 12 13 11 Wear (μm) 90 96 25

From the above test results, it can be seen that the sliding member of the embodiment of the present invention exhibits a stable performance throughout the test time with a low coefficient of friction, has a very small wear amount of 15 μm or less, and has excellent sliding characteristics. I was doing it. On the other hand, the sliding member of the comparative example had a high coefficient of friction, a large amount of wear, and poor sliding characteristics.

[0084]

According to the present invention as described above, an excellent sliding which shows a stable low coefficient of friction under many different use conditions such as dry friction conditions or oil-in-oil or oil lubrication conditions, and has a very small amount of wear. A sliding member exhibiting characteristics is provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a sliding member of the present invention.

FIG. 2 is a plan view showing an expanded metal as a base material.

FIG. 3 is a cross-sectional view showing an example of the sliding member of the present invention using the expanded metal shown in FIG.

FIG. 4 is a sectional view showing an example of the sliding member of the present invention using a woven wire mesh as a base material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel back metal 2 Porous metal sintered layer 3 Coating layer 4 Expanded metal 5 Side 6 Mesh 7 Coating layer 8 Woven wire mesh 9 Coating layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 61/06 C08L 61/06 79/08 79/08 Z 81/06 81/06 C10M 103/02 C10M 103 / 02 Z 103/06 103/06 CD 107/32 107/32 107/38 107/38 107/44 107/44 107/46 107/46 123/02 123/02 125/22 125/22 125/24 125/24 // C10N 10:02 10:04 10:12 30:06 40:02 50:08

Claims (10)

[Claims] 1. 1 to 10% by weight of one or more resins selected from the group consisting of 5 to 40% by weight of barium sulfate, 1 to 30% by weight of a phosphate and 1 to 30% by weight of a polyimide resin, a calcined phenol resin and a polyphenylene sulfone resin. A resin composition for a sliding member comprising the balance of ethylene tetrafluoride resin. 2. The resin composition for a sliding member according to claim 1, wherein the polyimide resin is selected from an aromatic polyimide resin and a thermosetting polyimide resin. 3. The resin composition for a sliding member according to claim 1, wherein the phosphate is a metal salt selected from secondary phosphoric acid, tertiary phosphoric acid and pyrophosphoric acid. 4. The sliding member according to claim 3, wherein the phosphate is selected from trilithium phosphate, lithium hydrogen phosphate, lithium pyrophosphate, tricalcium phosphate, calcium hydrogen phosphate, and calcium pyrophosphate. Resin composition. 5. The resin composition for a sliding member according to claim 1, further comprising 5% by weight or less of graphite or molybdenum disulfide. 6. A sliding member formed by filling and covering a pore and a surface of a porous metal sintered layer formed on a steel back metal with a resin composition, or a resin composition covering a mesh and a surface of a metal mesh. Wherein the resin composition contains 5-40% by weight of barium sulfate and 1-30% of phosphate.
Weight%, one or two selected from polyimide resin, calcined phenol resin and polyphenylene sulfone resin
A sliding member comprising a resin composition comprising 1 to 10% by weight of at least one kind of resin and a balance of ethylene tetrafluoride resin. 7. The sliding member according to claim 6, wherein the polyimide resin in the resin composition is selected from an aromatic polyimide resin or a thermosetting polyimide resin. 8. The sliding member according to claim 6, wherein the phosphate is a metal salt selected from secondary phosphoric acid, tertiary phosphoric acid, and pyrophosphoric acid. 9. The sliding member according to claim 8, wherein the phosphate is selected from trilithium phosphate, lithium hydrogen phosphate, lithium pyrophosphate, tricalcium phosphate, calcium hydrogen phosphate, and calcium pyrophosphate. 10. The resin composition further comprising graphite or molybdenum disulfide in a proportion of 5% by weight or less.
10. The sliding member according to any one of claims 1 to 9.