JPH0841484A - Resin composition for sliding member and sliding member using the same composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition for sliding members excellent in friction and wear characteristics and durability under dried conditions or many different use conditions, e.g. in oil or lubricating conditions and a sliding member using the composition. CONSTITUTION:This resin composition for sliding members contains 1-25wt.% of a component A selected from a group comprising a phosphoric acid salt and barium sulfate, 1-15wt.% of a component B selected from a group comprising magnesium silicate and mica and a component C selected from a group comprising lead, tin, lead-tin alloy and their mixture and the residual part of polytetrafluoroethylene. This sliding member is obtained by impregnating and coating the pore clearance and surface of porous metal sintered layer formed on steel with the resin or packing and coating the mesh or the surface of metal network body with the resin composition.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, polytetrafluoroethylene (hereinafter abbreviated as "PTFE resin") has excellent self-lubricating property, low friction coefficient, and further has chemical resistance and heat resistance. Widely used for sliding members.

However, a sliding member made of PTFE resin alone is inferior in wear resistance and creep resistance.
Depending on the intended use of the sliding member, (a) solid lubricant such as graphite or molybdenum disulfide and / or reinforcing material such as glass fiber or carbon fiber may be added to the PTFE resin, or (b) steel backing may be used. The above defects are compensated by impregnating and coating the pores and the surface of the porous metal sintered layer with the PTFE resin, and (c) filling and coating the mesh and the surface of the metal network with the PTFE resin.

The sliding member having the aspect (b) is a so-called multi-layer sliding member. For example, Japanese Patent Publication No. 31-2452, Japanese Patent Publication No. 39-16950, and Japanese Patent Publication No. It is known 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 impregnated with a PTFE resin or a PTFE resin containing a filler made of lead or a lead compound. Has been done.

A sliding member having the above-mentioned form (c) is known, for example, from Japanese Patent Publication No. 55-23740. This publication discloses a lining foil having a self-lubricating property, which is made of a material including a metal fabric, a fluoroplastic, and a reinforcing material of an inorganic fiber.

[0006]

The various sliding members described above have a low coefficient of friction and exhibit satisfactory performance under many different conditions of use, for example, under dry conditions or in oil or oil lubrication conditions. However, it is difficult to say that the sliding member has sufficient durability.

Further, in the PTFE resin composition for sliding members, many fillers for engineering plastics, particularly graphite, molybdenum disulfide or other metal sulfides, metal oxides, glass fibers, carbon fibers, etc. Inorganic fibers are used. However, although these fillers may contribute to the improvement of the abrasion resistance of the resin layer, they often cause a problem of inhibiting the low friction property inherent to the PTFE resin. The present invention has been made in view of the above circumstances, and an object thereof is a sliding member having excellent friction and wear characteristics and durability under many different use conditions such as dry conditions or in oil or oil lubrication conditions. A resin composition for use and a sliding member using the same.

[0008]

Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that the resin composition is present in the pores and the surface of the porous metal sintered layer formed on the steel backing metal. In a sliding member formed by impregnating and coating or by filling and coating a resin composition on the mesh and surface of a metal reticulated body, wherein the resin composition comprises a PTFE resin, a phosphate and barium sulfate. A component A selected, a component B selected from the group consisting of magnesium silicate and mica, and a component C selected from the group consisting of lead, tin, lead-tin alloys and mixtures thereof are added in specific amounts. It has been found that the sliding member used can exhibit excellent friction and wear characteristics and durability under many different use conditions such as dry conditions or oil conditions or oil lubrication conditions. The present invention has been completed based on such findings, and the gist of each invention is as follows.

The first aspect of the present invention is to provide 1 to 25 components A selected from the group consisting of phosphate and barium sulfate.
% By weight, 1 to 15% by weight of component B selected from the group consisting of magnesium silicate and mica, and 5 to 50% by weight of component C selected from the group consisting of lead, tin, lead-tin alloys and mixtures thereof. However, the rest is a resin composition for a sliding member, which is characterized in that it is polytetrafluoroethylene.

The second aspect of the present invention is to provide a porous metal sintered layer formed on a steel backing metal and a resin composition layer formed by impregnating and covering the pores and the surface thereof, or a mesh of a metal network. And a resin composition layer formed by filling and coating the surface thereof, the resin composition layer comprising 1 to 25% by weight of component A selected from the group consisting of phosphate and barium sulfate, magnesium silicate and mica. 1 to 15% by weight of component B selected from the group, 5 to 50% by weight of component C selected from the group consisting of lead, tin, lead-tin alloys and mixtures thereof, with the balance being polytetrafluoroethylene It exists in the sliding member.

The present invention will be described in detail below. First, the resin composition for sliding members of the present invention will be described. In the present invention, the PTFE resin as the main component of the resin composition is mainly fine powder, for example, “Teflon 6CJ (trade name)” manufactured by Mitsui DuPont Fluorochemicals Co., Ltd., “Polyflon F201 (product Name) "," Fluon CD-076 (trade name) "," Fluon CD-123 (trade name) ", and" Fluon CD-4 (trade name) "manufactured by Asahi Glass Co., Ltd. are used.

Molding powders such as Teflon 7AJ (trade name) manufactured by Mitsui DuPont Fluorochemical Co., Ltd. added to the above fine powder in an amount of 20% by weight or less based on the resin composition are also used. it can.
The amount of PTFE resin in the resin composition is the remaining amount obtained by subtracting the amount of the filler from the amount of the resin composition, and preferably 40.
˜93 wt%, and more preferably 50 to 70 wt%.

Component A is selected from the group consisting of phosphate and barium sulfate. Phosphate and barium sulfate per se are not substances exhibiting lubricity such as graphite and molybdenum disulfide, but when blended with a PTFE resin, the surface of the mating material ( It exerts the effect of promoting the film-forming property of the lubricating coating of PTFE resin on the sliding surface).

In the present invention, examples of the phosphate include metal salts such as secondary phosphate and pyrophosphate. As a metal forming a salt, an alkaline earth metal is preferable.
Specifically, calcium hydrogen phosphate (CaHPO ₄ (2
H ₂ O)), calcium pyrophosphate (Ca ₂ P ₂ O ₇ )
Is most preferred. The average particle size of phosphate is usually 20 μm
Hereinafter, the thickness is preferably 1 to 10 μm.

The barium sulphate (BaSO ₄ ) may be either precipitated or barium sulphate. Such barium sulfate is commercially available from, for example, Sakai Chemical Industry Co., Ltd., and can be easily obtained. The average particle size of barium sulfate is usually 10 μm or less, preferably 1 to 5 μm
It is said.

By adding a small amount (for example, 1% by weight) of the component A to the PTFE resin, the effect of promoting the film-forming property of the lubricating coating described above begins to appear, and the effect is maintained up to 25% by weight. . However, if it exceeds 25% by weight, the amount of the lubricating coating formed on the surface of the mating material becomes too large, which may rather reduce the wear resistance. Therefore, the blending amount of the component A is 1 to 25% by weight, preferably 5
-20% by weight, more preferably 10-20% by weight.

Component B is selected from the group consisting of magnesium silicate and mica. Magnesium silicate and mica are blended with the PTFE resin to sufficiently exert the low friction property inherent to the PTFE resin and to improve the wear resistance.

In the present invention, magnesium silicate contains silicon dioxide (SiO ₂ ) in an amount of 40.0% by weight or more, magnesium oxide (MgO) in an amount of 10.0% by weight or more, and the weight ratio of SiO _{2 to} MgO. Is 2.1-
Those in the range of 5.0 are preferably used. In particular,
2MgO · 3SiO ₂ · nH ₂ O, 2MgO · 6SiO
Such as ₂ · nH ₂ O is exemplified. SiO for MgO
Magnesium silicate in which the weight ratio of ₂ is less than 2.1 or more than 5.0 deteriorates the friction characteristics and wear resistance of the PTFE resin. On the other hand, examples of mica include sericite (sericite), muscovite (muscovite), and biotite (biotite).

The proportion of the component B is 1 to 15% by weight, preferably 5 to 12% by weight, more preferably 8 to 10% by weight. If the blending ratio is less than 1% by weight, the above-mentioned effects of the component B filler are not sufficiently exerted, and 15% by weight
If it exceeds, the above-mentioned effects of the component A filler will be impaired.

The C component is selected from the group consisting of lead, tin, lead-tin alloys and mixtures thereof. The C component is
Exhibits the effect of improving wear resistance. And lead and tin are suitable for use under dry conditions, and lead-tin alloy is suitable for use under oil or oil lubrication conditions. As a lead-tin alloy,
A lead-tin alloy containing 5 to 30% by weight of tin is preferably used. The blending ratio of the component C is 5 to 50% by weight, preferably 20 to 40% by weight, more preferably 25 to 30% by weight. If the blending ratio is less than 5% by weight, no effect is observed in improving the wear resistance, and if it exceeds 50% by weight, the wear resistance is rather decreased.

In the present invention, as the component D in the above-mentioned resin composition for a sliding member, (i) disulfide is used in order to further improve the friction characteristics and wear resistance in use in oil or under oil lubrication conditions. It is possible to add molybdenum, (ii) graphite for further improving the abrasion resistance under the use under dry conditions, or (iii) conductive carbon black for improving the antistatic effect. The addition amount of molybdenum disulfide is usually 5% by weight or less, preferably 0.1 to 5% by weight, and the addition amount of graphite is usually 4% by weight or less, preferably 0.1 to 3% by weight,
The amount of conductive carbon black added is usually 5% by weight or less, preferably 0.1 to 4% by weight.

As the component D, a mixture of graphite and conductive carbon black can be used. In this case, the content of graphite in the resin composition for sliding members is usually 4% by weight or less, preferably graphite. 0.1 to 3% by weight, conductive carbon black is usually 5% by weight or less,
It is preferably 0.1 to 4% by weight.

Next, the sliding member of the present invention and the manufacturing method thereof will be described. First, a sliding member (I) using a base material composed of a steel backing made of a thin steel plate and a porous metal sintered layer backed by the backing metal, and a method for manufacturing the same will be described. Although a rolled steel thin plate for general structure is used as the steel backing metal forming the base material, other rolled steel thin plates may be used depending on the application of the sliding member. It is preferable to use a continuous strip that is wound as a coil and provided as a hoop material, but it is not limited to the continuous strip, and a strip cut to an appropriate length may be used. I can. If necessary, these strips may be plated with copper or the like to improve the corrosion resistance.

The porous metal sintered layer is formed of a copper alloy having excellent friction and wear characteristics such as bronze, lead bronze, phosphor bronze, etc. However, depending on the purpose and application, other than copper alloys, for example, aluminum alloys, irons, etc. You may form from. The metal powder forming the porous metal sintered layer may have a spherical shape or an irregular shape such as granules, and its particle size is such that it passes through a 80-mesh sieve but does not pass through a 350-mesh sieve. preferable.

In the sliding member (I) of the present invention, the alloy powder and the alloy powder are firmly bonded to the steel backing in the porous metal sintered layer. The thickness of the porous metal sintered layer is about 0.10 to 0.40 mm, particularly 0.20.
It is preferably 0.30 mm and the porosity is about 10
It is preferably not less than volume%, particularly preferably 15 to 40 volume%.

The resin composition is obtained by mixing the PTFE resin powder with each of the above-mentioned necessary fillers, and then adding a petroleum solvent to the resulting mixture and stirring and mixing the resin composition. It can be obtained as a thing. Mixing the PTFE resin and the filler is performed at room temperature transition point (1
9 ° C) or lower, preferably at a temperature of 10-18 ° C,
Also, the mixture obtained and the petroleum solvent are stirred and mixed at the same temperature as above. By adopting such temperature conditions, the fibrous state of the PTFE resin is prevented, and a uniform mixture can be obtained.

Petroleum solvents include naphtha, toluene,
In addition to xylene, an aliphatic solvent or a mixed solvent of an aliphatic solvent and a naphthene solvent is used. The proportion of the petroleum solvent used is 100 for the mixture of PTFE resin powder and filler.
15 to 30 parts by weight relative to parts by weight. When the proportion of the petroleum-based solvent used is less than 15 parts by weight, the resin composition imparted with wettability has poor spreadability in the step of impregnating and coating the porous metal sintered layer, which will be described later, resulting in sintering. Irregularity is likely to occur in the impregnation coating on the layer. On the other hand, when the proportion of the petroleum solvent used exceeds 30 parts by weight, not only the impregnation coating work becomes difficult, but also the uniformity of the coating thickness of the resin composition is impaired, and the resin composition and the sintered layer The adhesion strength with The sliding member (I) of the present invention has the following (a) to
It is manufactured through the step (d).

(A) A resin composition having wettability is sprinkled on a porous sintered layer formed on a backing made of a thin steel plate and rolled by a roller to impregnate the sintered layer with the resin composition. At the same time, 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 times the coating thickness required for the final composition of the resin composition.
The thickness is about 2.5 times. Most of the impregnation of the resin composition into the pores of the porous sintered layer proceeds in this step.

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

(C) The back metal 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 ten minutes, then baked and then taken out of the furnace again. Adjust the dimensional variation by roller processing.

(D) The back metal, the size of which has been adjusted in the step (c), is cooled (air cooling or natural cooling), and then, if necessary, a straightening roller treatment is performed to correct the undulations of the back metal and the desired sliding is performed. The moving member.

In the sliding member obtained through the steps (a) to (d), the thickness of the porous metal sintered layer is 0.10.
.About.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 thus obtained is cut into an appropriate size to be used as a sliding plate in a flat plate state, and is also bent to be used as a cylindrical winding bush.

Next, the sliding member (II) of the present invention using a base material composed of a metal mesh and a method for manufacturing the same will be described. As the metal net-like body forming the base material, (i) a fixed thin metal mold is fixed between a fixed lower mold having a linear blade and a movable upper mold having a corrugated, trapezoidal, triangular, etc. blade. An expander that feeds at a right angle to the blade of a fixed lower mold, and reciprocates the movable upper mold in the vertical direction to make notches in the thin metal plate and at the same time widen the notches to form a regular mesh row. Metal, (ii) a braided wire mesh formed by weaving fine metal wires as warp threads and weft threads, (iii) a braided wire mesh formed by knitting fine metal wires, and the like are used.

As an expanded metal, the thickness is 0.3.
It is preferable that a thin metal plate of ˜2 mm is subjected to an expanding process and each side (strand) is formed to have a length of 0.1 to 1.5 mm and a thickness of 0.1 to 1.0 mm. The woven wire mesh or the braided wire mesh is preferably formed by weaving or knitting fine metal wires having a wire diameter of 0.1 to 0.5 mm into a mesh of 10 to 200 mesh.

As the metal material for forming the expanded metal, the woven or braided wire mesh, thin plates or fine wires such as stainless steel, copper, phosphor bronze alloy, bronze alloy and iron are preferable.

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

(A) A resin composition is sprinkled on a metal mesh made of expanded metal, woven or braided wire mesh and rolled by 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. In this step, the coating layer has a thickness of 2 to 2.5 times the coating thickness required for the final composition of the resin composition.

(B) The metal mesh treated in the above step (a) is held in a drying oven heated to a temperature of 200 to 250 ° C. for several minutes to remove the petroleum solvent and then dried. The resin composition is subjected to a pressure roller treatment under a pressure of 300 to 600 kgf / cm ² so that the resin composition has a predetermined thickness.

(C) After the metal reticulate body 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 ten minutes, the resin composition is baked. Then, it is taken out of the furnace, and the dimensional variation is adjusted again by the 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. 1.
It is set to 0 mm. The sliding member thus obtained is cut into an appropriate size to be used as a sliding member in a flat plate state, and is also bent to be used as a cylindrical winding bush.

The sliding member (I) of the present invention has a sliding speed of 10
In the unlubricated thrust test of m / min, load of 120 kgf / cm ² , and test time of 8 hours, the friction coefficient was 0.06.
.About.0.12, the wear amount is 30 .mu.m or less, and shows excellent sliding characteristics under a high load.

Further, the sliding member (I) of the present invention has a friction coefficient of 0.0 in an oil application reciprocating test with a sliding speed of 5 m / min, a load of 200 kgf / cm ² and a test time of 8 hours.
12 to 0.062, the wear amount is 30 μm or less, and shows excellent sliding characteristics under high load.

On the other hand, the sliding member (II) of the present invention has a friction coefficient of 0. 0 in a non-lubricated thrust test with a sliding speed of 5 m / min, a load of 100 kgf / cm ² and a test time of 8 hours.
06-0.12, the amount of wear is 20 μm or less, and shows excellent sliding characteristics under high load.

The sliding member (I) and the sliding member (II) containing graphite of the present invention have a sliding speed of 10 m / mi.
n, a load of 120 kgf / cm ² , and a test time of 8 hours in a non-lubricated thrust test, the friction coefficient is 0.06 to 0.1.
2. The amount of wear is 25 μm or less, which shows excellent sliding characteristics under high load.

Further, the sliding member (I) and the sliding member (II) containing molybdenum disulfide of the present invention have a sliding speed of 5 m.
/ Min, load 200 kgf / cm ² , test time 8 hours in oil application reciprocation test, friction coefficient is 0.011 ~
It has a wear amount of 0.030 and a thickness of 25 μm or less, and exhibits excellent sliding characteristics under a high load.

Further, the sliding member (I) and the sliding member (II) containing the conductive carbon black of the present invention have a sliding speed of 10 m / min, a load of 120 kgf / cm ² , and a non-lubricated thrust for a test time of 8 hours. In the test, the coefficient of friction was 0.07 to 0.15, the amount of wear was 30 μm or less, and the volume resistivity was 1 × 10 ⁸ Ω. It exhibits conductivity of cm or less and excellent sliding characteristics under high load.

[0047]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded. In the following examples, the sliding characteristics of the sliding member (I) are determined by the following test methods (1) and (2), and the sliding characteristics of the sliding member (II) are (3). It evaluated by the test method of.

Thrust test (1): The friction coefficient and the wear amount were measured under the conditions shown in Table 1. The friction coefficient indicates the variation value of the friction coefficient from the start of the test to the end of the test for 1 hour, and the wear amount is the dimensional change of the sliding surface after 8 hours of the test time. Indicated.

[0049]

[Table 1] Sliding speed 10 m / min Load 120 kgf / cm ² Test time 8 hours Lubricated unlubricated Counterpart material Carbon steel for machine structure (S45C)

Thrust test (2): The friction coefficient and the wear amount were measured under the conditions shown in Table 2. The friction coefficient indicates the variation value of the friction coefficient from the start of the test to the end of the test for 1 hour, and the wear amount is the dimensional change of the sliding surface after 8 hours of the test time. Indicated.

[0051]

[Table 2] Sliding speed 5 m / min Load 100 kgf / cm ² Test time 8 hours Lubrication unlubricated Counterpart material Carbon steel for machine structure (S45C)

Reciprocating sliding test: The friction coefficient and the amount of wear were measured under the conditions shown in Table 3. The friction coefficient indicates the variation value of the friction coefficient from the start of the test to the end of the test for 1 hour, and the wear amount is
The amount of dimensional change of the sliding surface after the test time of 8 hours is shown.

[0053]

[Table 3] Sliding speed 5 m / min Load 200 kgf / cm ² Test time 8 hours Lubrication Before the test, oil was applied to the sliding surface (Idemitsu Kosan ATF).
-DII) Coating Counterpart material Chromium plating Coated carbon steel for machine structure (S
45C)

Volume resistivity: The volume resistivity in the direction perpendicular to the surface of the sliding member is measured by the four-point probe method: The probe interval is 5 mm on the sample surface.
Put the stylus on the Mitsubishi Chemical Corporation's resistivity meter LOREST
It was measured with A-AP and MCP-T400.

Examples 1 to 24 and Comparative Examples 1 to 3 In the following examples, as PTFE resin, "Teflon 6CJ" (manufactured by Mitsui DuPont Fluorochemical Co., Ltd.), as petroleum solvent, aliphatic solvent and naphthene solvent were used. Was used as a mixed solvent (trade name "Exsol" manufactured by Exxon Chemical Co., Ltd.).

First, the PTFE resin and the fillers shown in Tables 4 to 9 were fed into a Henschel mixer and mixed by stirring, and 100 parts by weight of the obtained mixture was mixed with 2 parts of the petroleum solvent.
0 part by weight was compounded and mixed at a temperature (15 ° C.) below the room temperature transition point of the PTFE resin to obtain a resin composition.

The resin composition thus obtained was sprinkled onto a porous metal sintered layer (thickness 0.25 mm) formed on a steel backing (thickness 0.70 mm) made of a thin metal plate to give a resin composition Rolling was performed with a roller to a thickness of 0.25 mm to obtain a multilayer plate in which the pores and the surface of the sintered layer were impregnated with the resin composition. The obtained multi-layer board was held 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 applied with a roller at a pressure of 400 kgf / c.
The thickness of the resin composition layer coated on the sintered layer was 0.10 mm by rolling at m ² .

Next, the pressure-treated multi-layer plate is heated in a heating furnace at 37 ° C.
After heating and baking at 0 ° C. for 10 minutes, pressure was applied again with a roller to adjust dimensions and correct waviness, and a multilayer sliding member was prepared. The multi-layer plate after the straightening 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 multi-layer sliding member thus obtained,
In the figure, reference numeral (1) is a steel backing metal, (2) is a porous metal sintered layer lined on the steel backing metal, and (3) is a resin composition filled and coated on the pores and the surface of the metal sintered layer. Is a coating layer.

The results of the thrust test (1) of each multi-layer sliding member are shown in Tables 4-9. In addition, "SiO ₂ / Mg in the table
“O” indicates the weight ratio of SiO _{2 to} MgO, and the mixing ratio is indicated by weight%.

[0060]

[Table 4] ──────────────────────────────────── Example 1 2 3 4 5 PTFE 80 70 65 60 60 <A component> Calcium hydrogen phosphate 5 10 15 15 10 Calcium pyrophosphate --- --- Barium sulfate --- --- Barium sulfate (type) --- --- <B component> Magnesium silicate 5 10 10 15 10 SiO ₂ / MgO 2.2 2.2 2.2 2.2 2.2 Mica − − − − − Mica (type) − − − − − <C component> Lead − 10 10 10 − Tin 10 − − − − Lead tin alloy (tin 25 wt% ) − − − − 20 Thrust test (1) Friction coefficient (× 10 ⁻² ) 8 to 12 8 to 10 7 to 9 7 to 10 6 to 9 Wear amount (μm) 30 22 13 15 13 ────── ──────────────────────────────

[0061]

[Table 5] ──────────────────────────────────── Actual Example 6 7 8 9 10 PTFE 55 55 50 55 50 <A component> Calcium hydrogen phosphate 15 − − − − Calcium pyrophosphate − − − − − Barium sulphate − 15 15 10 15 Barium sulphate (type) − Eclectic elutrix Sedimentation Sedimentation <B component> Silicic acid Magnesium 10 10 15 10 10 SiO ₂ / MgO 2.2 2.2 2.2 4.5 4.5 Mica − − − − − Mica (type) − − − − − <C component> Lead 20 20 20 25 25 Tin − − − − − Lead tin alloy ( 25% by weight of tin) − − − − − Thrust test (1) Coefficient of friction (× 10 ^-2 ) 6 to 8 7 to 9 7 to 9 7 to 9 7 to 9 Wear amount (μm) 12 8 8 7 6 ── ───────────────────────────────────

[0062]

[Table 6] ──────────────────────────────────── Example 11 12 13 14 15 PTFE 45 40 40 55 55 <Component A> Calcium hydrogen phosphate − − − − − Calcium pyrophosphate − − − 5 10 Barium sulphate 20 25 15 − − Barium sulphate (type) Sedimentation elutriation Erritation − − <B component> Magnesium silicate 10 10 15 10 5 SiO ₂ / MgO 2.2 2.2 4.5 2.2 2.2 Mica − − − − − Mica (type) − − − − − <C component> Lead 25 − 30 30 30 Tin − − − − − Lead tin alloy (tin 25% by weight) −25 − − − Thrust test (1) Friction coefficient (× 10 ⁻² ) 7 to 9 7 to 8 7 to 9 7 to 10 7 to 10 Wear amount (μm) 10 12 7 8 8 ─── ──────────────────────────────────

[0063]

[Table 7] ──────────────────────────────────── Example 16 17 18 19 20 PTFE 50 50 45 45 45 <A component> Calcium hydrogen phosphate 5 − − − − Calcium pyrophosphate − − − − − Barium sulphate − 10 10 15 15 Barium sulphate (type) Eclectic eruption Eclectic emissivity <B component> Magnesium silicate 15 − − − − SiO ₂ / MgO 2.2 − − − − Mica − 10 15 10 10 Mica (type) − Muscovite Muscovite Muscovite Biotite <C component> Lead 30 − − 30 30 Tin − 30 − − − Lead Tin alloy (25% by weight of tin) − − 30 − − Thrust test (1) Friction coefficient (× 10 ⁻² ) 7 to 9 7 to 9 7 to 9 6 to 9 7 to 10 Wear amount (μm) 9 15 15 12 20 ────────────────────────────────────

[0064]

[Table 8] ──────────────────────────────────── Example 21 22 23 24 PTFE 40 45 35 35 <Component A> Calcium hydrogen phosphate 5 10 10 10 Calcium pyrophosphate --- --- Barium sulfate --- --- Barium sulfate (type) ----- <Component B> Magnesium silicate 15 5 15 5 SiO ₂ / MgO 4.5 4.5 2.2 2.2 Mica − − − − Mica (type) − − − − <C component> Lead − 40 40 50 Tin − − − − Lead tin alloy (25 wt% tin) 40 − − − Thrust test (1) Friction coefficient (× 10 ^-2 ) 7 to 8 6 to 9 6 to 8 8 to 11 Wear amount (μm) 25 18 19 20 ───────────────────────── ─────────────

[0065]

[Table 9] ──────────────────────────── Comparative Example 1 2 3 PTFE 80 70 70 <Component A> Calcium hydrogen phosphate − 10 − Calcium pyrophosphate − − − Barium sulfate − − 10 Barium sulfate (type) − − Emissivity <B component> Magnesium silicate − − − SiO ₂ / MgO − − − Mica − − − Mica (type) − − − < C component> Lead 20 20 20 Tin --- Lead-tin alloy (25% by weight of tin) --- Thrust test (1) Friction coefficient (× 10 ^-2 ) 12-17 12-15 11-14 Wear amount (μm) 70 53 47 ────────────────────────────

From the above-mentioned test results, the multi-layer sliding member of the example of the present invention exhibits stable performance with a low friction coefficient throughout the test time, and the wear amount is 30 μm or less, which is extremely small, and the excellent sliding property is obtained. Was possessed. on the other hand,
The multi-layer sliding member of the comparative example had a relatively stable coefficient of friction, but a large amount of wear and poor sliding characteristics.

Next, the above-described third, sixth, eighth, tenth,
Semi-cylindrical multi-layers having a radius of 10.0 mm, a length of 20.0 mm and a wall thickness of 1.05 mm after cutting the multi-layer plates of 13, 14, 18 and 21 and Comparative Examples 1 and 3 A sliding member test piece was obtained. Reciprocating motion test of each multilayer sliding member (2)
The results are shown in Tables 10 and 11.

[0068]

[Table 10] ──────────────────────────────────── Example 3 6 8 10 13 Friction coefficient (× 10 ^-3 ) 16 to 53 12 to 62 12 to 50 12 to 44 13 to 38 Wear amount (μm) 28 28 21 23 20 ──────────────────── ─────────────────

[0069]

[Table 11] ──────────────────────────────────── Actual Example Comparative Example 14 18 21 13 Coefficient of friction (× 10 ^-3 ) 14 to 46 13 to 50 14 to 40 12 ^* 13 to 130 Amount of wear (μm) 22 28 26 90 83 ─────────────────── ────────────────── (*) The test piece of Comparative Example 1 was discontinued because the friction coefficient sharply increased one hour after the start of the test. The amount of wear indicates the value when the test was stopped.

From the above-mentioned test results, the multi-layer sliding member of the present invention exhibited stable performance with a low coefficient of friction throughout the test time, and the amount of wear of the multi-layer sliding member after the test was small. .

Examples 25 to 34 and Comparative Examples 4 to 5 In the following examples, "Teflon 6CJ" (manufactured by Mitsui DuPont Fluorochemical Co.) as a PTFE resin, an aliphatic solvent and a naphthene solvent as a petroleum solvent. Was used as a mixed solvent (trade name "Exsol" manufactured by Exxon Chemical Co., Ltd.).

First, the PTFE resin and the fillers shown in Tables 12 to 14 were fed into a Henschel mixer and mixed by stirring, and 20 parts by weight of a petroleum solvent was added to 100 parts by weight of the obtained mixture. , And the PTFE resin was mixed at a temperature (15 ° C.) below the room temperature transition point to obtain a resin composition.

A phosphor bronze alloy plate having a plate thickness of 0.30 mm is subjected to an expanding process, and each side (strand) is 0.60 m.
0.43 mm thickness with square mesh of m
Formed expanded metal. This was used as the base material A. A woven wire mesh having a mesh of 50 mesh was formed by using a phosphor bronze alloy fine wire having a wire diameter of 0.3 mm for the weft thread and the warp thread. This was used as a base material B.

The above resin composition was sprinkled and supplied onto a base material made of expanded metal and a base material made of woven wire mesh, and rolled by rollers to fill the mesh of the base material with the resin composition and After forming a coating layer of the resin composition on the surface, it was kept in a hot air drying oven 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 at 360 ° C. for 10 minutes in a heating furnace, and then pressure-treated with a roller to adjust dimensions and correct waviness, etc. A substrate on which a coating layer having a thickness of 0.13 mm was formed was obtained. The base material that has been straightened is cut, and one side is 30 m.
A sliding plate test piece of m was obtained.

FIG. 2 is a plan view showing the expanded metal, and FIG. 3 is a sectional view showing a sliding member using the expanded metal shown in FIG. 2 as a base material. In the drawing, reference numeral (4) is an expanded metal. (5) is a side (strand), (6)
Is a mesh, and (7) is a coating layer made of a resin composition filled and coated on the mesh and surface of the expanded metal. 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) is a woven wire mesh, and (9) is a filling mesh on the mesh and surface of the mesh. It is a coating layer composed of the resin composition.

The results of the thrust test (2) of each sliding member are shown in Tables 12-14. In addition, "SiO ₂ / Mg in the table
“O” indicates the weight ratio of SiO _{2 to} MgO, and the mixing ratio is indicated by weight%.

[0077]

[Table 12] ──────────────────────────────────── Example 25 26 27 28 29 PTFE 65 60 55 50 50 <Component A> Calcium hydrogen phosphate 15 15 − − − Calcium pyrophosphate − − − − − Barium sulphate − − 15 15 15 Barium sulphate (type) − − Eclectic eruption Sedimentation <B component> Magnesium silicate 10 15 10 15 10 SiO ₂ / MgO 2.2 2.2 4.5 4.5 4.5 Mica − − − − − Mica (type) − − − − − <C component> Lead 10 10 20 20 25 Tin − − − − − Lead tin alloy (tin 25 wt%) − − − − − Base material type A A A A A A Thrust test (2) Friction coefficient (× 10 ^-2 ) 6 to 9 6 to 8 5 to 7 5 to 7 5 to 8 Abrasion amount (μm) 18 15 6 6 5 ────────────────────────────────────

[0078]

[Table 13] ──────────────────────────────────── Example 30 31 32 33 34 PTFE 40 55 40 45 35 <Component A> Calcium hydrogen phosphate − − − 10 10 Calcium pyrophosphate − 10 − − − Barium sulphate 15 − 15 − − Barium sulphate (type) Electrification − Electrification − − <Component B> Magnesium silicate 15 5 − 5 15 SiO ₂ / MgO 4.5 4.5 − 2.2 2.2 Mica − − 15 − − Mica (type) − − Muscovite − − <C component> Lead 30 30 30 40 40 Tin − − − − − Lead tin alloy (tin 25 wt%) − − − − − Base material type B B B A A A Thrust test (2) Friction coefficient (× 10 ^-2 ) 4 to 7 5 to 7 6 to 9 6 to 8 6 to 9 Amount of wear (μm) 4 5 12 14 15 ─────────────────────────────────────

[0079]

[Table 14] ──────────────────────────────── Example Comparative Example 35 45 PTFE 35 80 80 <A component > Calcium hydrogen phosphate 10 --- Calcium pyrophosphate --- Barium sulfate --- 20 Barium sulfate (type) --Electricity <B component> Magnesium silicate 5 --- SiO ₂ / MgO 2.2 --- Mica --- Mica (type) ) − − − <C component> Lead 50 20 − Tin − − − Lead tin alloy (25 wt% tin) − − − Base material type A A A Thrust test (2) Friction coefficient (× 10 ^-2 ) 8 to 10 10-15 11-17 Wear amount (μm) 18 60 65 ─────────────────────────────────

From the above-mentioned test results, the sliding members of the examples of the present invention exhibit stable performance with a low coefficient of friction throughout the test time, and the wear amount is 20 μm or less, which is extremely small, and has excellent sliding characteristics. It was what I was doing. 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.

Examples 36-59 A resin composition was prepared by mixing in the same manner as in Example 1 except that the fillers shown in Tables 15-20 were mixed with the PTFE resin, and then lined on a steel backing. A resin composition layer was formed on the porous metal sintered layer to prepare a sliding member. Tables 15 to 20 show the results of the thrust test (1), the reciprocating sliding test and the measurement of the volume resistivity. In addition, "S
“IO ₂ / MgO” indicates the weight ratio of SiO _{2 to} MgO, and the compounding ratio is indicated by weight%.

[0082]

[Table 15] ──────────────────────────────────── Example 36 37 38 39 40 PTFE 58 63 53 44 44 <Component A> Calcium hydrogen phosphate 10 − − − − Calcium pyrophosphate − − − − − Barium sulphate − 5 10 20 20 Barium sulphate (type) − Ectopic eruption Eclectic sedimentation <B component> Silicic acid Magnesium 10 5 10 10 10 SiO ₂ / MgO 2.2 2.2 2.2 2.2 2.2 <C component> Lead 20 25 25 25 25 Tin − − − − − Lead tin alloy (tin 25 wt%) − − − − − <D component> 2 Molybdenum sulfide 2 2 2 1 1 Graphite − − − − − Conductive carbon black − − − − − Thrust test (1) Friction coefficient (× 10 ⁻² ) 6 to 8 9 to 10 6 to 8 7 to 9 7 to 9 Abrasion amount (μm) 9 20 6 11 10 Reciprocating sliding test Friction coefficient (× 10 ^-3 ) 11 to 22 13 to 23 12 to 21 13 to 30 − Abrasion amount (μm) 12 15 12 18 − ────────────────────────────────────

[0083]

[Table 16] ──────────────────────────────────── Example 41 42 43 44 45 PTFE 43 54 58 52 48 <Component A> Calcium hydrogen phosphate − 10 5 10 − Calcium pyrophosphate − − − − − Barium sulphate 20 − − − 10 Barium sulphate (type) Sedimentability − − − Eccentricity <B component> Magnesium silicate 10 10 10 10 10 SiO ₂ / MgO 2.2 2.2 2.2 2.2 2.2 <C component> Lead 25 25 25 25 30 Tin − − − − − Lead tin alloy (tin 25% by weight) − − − − − <D component> Molybdenum disulfide 2 1 2 3 2 Graphite − − − − − Conductive carbon black − − − − − Thrust test (1) Friction coefficient (× 10 ⁻² ) 6 to 8 6 to 8 7 to 9 7 to 8 8 to 9 Amount of wear (μm) 8 6 9 7 6 reciprocating sliding test friction coefficient ^{(× 10 -3) - 12~25 11~22} - - wear amount (μm) - 16 16 - - ─── ────────────────────────────────

[0084]

[Table 17] ──────────────────────────────────── Example 46 47 48 49 50 PTFE 45 43 54 51 49.5 <Component A> Calcium hydrogen phosphate − − 10 − − Calcium pyrophosphate − − − − − Barium sulphate 10 15 − 10 10 Barium sulphate (type) Eclectic emissivity − Eclectic emissivity <B component> Silicic acid Magnesium 10 10 10 10 10 SiO ₂ / MgO 2.2 2.2 2.2 2.2 2.2 <C component> Lead 30 30 25 25 30 Tin − − − − − Lead tin alloy (tin 25 wt%) − − − − − <D component> 2 Molybdenum sulfide 5 2 − − − Graphite − − 1 4 0.5 Conductive carbon black − − − − − Thrust test (1) Friction coefficient (× 10 ⁻² ) 8 to 10 7 to 9 7 to 9 8 to 10 6 to 8 wear amount (μm) 28 6 5 25 4 reciprocating sliding test friction coefficient ^{(× 10 -3) - - -} - 14~46 wear amount (μm) - - - - 24 ───────────────────────────────────

[0085]

[Table 18]

[0086]

[Table 19] ─────────────────────────────── Example 53 54 55 PTFE 59 58 57 <A component> phosphorus Calcium hydrogen hydrate --- Calcium pyrophosphate ----- Barium sulfate 10 10 10 Barium sulfate (type) Eclectic emissive Eclectic <B component> Magnesium silicate 10 10 10 SiO ₂ / MgO 2.2 2.2 2.2 <C component> Lead 20 20 20 Tin --- Lead-tin alloy (25 wt% tin) --- <D component> Molybdenum disulfide --- Graphite --- Conductive carbon black 1 2 3 Thrust test (1) Friction coefficient (× 10 ^-2 ) 7 to 9 7 to 9 7 to 10 Wear amount (μm) 9 11 11 Volume resistivity Ω. cm 8.5 × 10 ⁶ 2.0 × 10 ³ 2.9 × 10 ² ───────────────────────────────

[0087]

[Table 20] ──────────────────────────────────── Example 56 57 58 59 PTFE 52 51 50 57 <Component A> Calcium hydrogen phosphate − − − − Calcium pyrophosphate − − − − Barium sulphate 10 10 10 10 Barium sulphate (kind) Eclectic elixir Eclectic emissivity <B component> Magnesium silicate 15 10 10 10 SiO ₂ / MgO 2.2 2.2 2.2 2.2 <C component> Lead 20 25 25 20 Tin ------ Lead tin alloy (tin 25 wt% ----- <D component> Molybdenum disulfide ----- Graphite ---- 1 Conductivity Carbon black 3 452 Thrust test (1) Coefficient of friction (× 10 ^-2 ) 8 to 9 8 to 9 9 to 12 7 to 9 Wear amount (μm) 10 14 22 10 Volume resistivity Ω.cm 3.5 × 10 ² 1.1 × 10 ² 3.2 × 10 ¹ 1.2 × 10 ³ ─────────────────────────────────────

[0088]

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

[Brief description of 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 sectional view showing an example of a sliding member of the present invention using expanded metal.

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

[Explanation of symbols]

 1: Steel back metal 2: Porous metal sintered layer 3: Resin coating layer 4: Expanded metal 6: Mesh 7: Resin coating layer 8: Woven wire mesh 9: Resin coating layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area C10M 125: 24 125: 04 125: 26 125: 22) C10N 10:04 10:08 10:12 30 : 06 40:02

Claims (8)

[Claims] 1. 1 to 25% by weight of a component A selected from the group consisting of phosphates and barium sulfate, and 1 to a component B selected from the group consisting of magnesium silicate and mica.
15% by weight, 5 to 50% by weight of component C selected from the group consisting of lead, tin, lead-tin alloys and mixtures thereof, the balance being polytetrafluoroethylene, for a sliding member Resin composition. 2. Magnesium silicate converts silicon dioxide into 4
0.0 wt% or more, 10.0 wt% magnesium oxide
The resin composition for a sliding member according to claim 1, which is magnesium silicate that is contained above and has a weight ratio of silicon dioxide to magnesium oxide in a range of 2.1 to 5.0. 3. Further, 5% by weight or less of molybdenum disulfide,
The resin composition for a sliding member according to claim 1, which contains graphite in an amount of 4% by weight or less or conductive carbon black in an amount of 5% by weight or less. 4. The resin composition for a sliding member according to claim 1, which further contains graphite in an amount of 4% by weight or less and conductive carbon black in an amount of 5% by weight or less. 5. A sliding member formed by impregnating and coating a resin composition on pores and a surface of a porous metal sintered layer formed on a steel backing, or a resin composition on a mesh and a surface of a metal mesh body. A sliding member formed by filling and coating, wherein the resin composition is selected from the group consisting of 1 to 25% by weight of component A selected from the group consisting of phosphate and barium sulfate, magnesium silicate and mica. 1 to 15% by weight of component B, 5 to 50% by weight of component C selected from the group consisting of lead, tin, lead-tin alloys and mixtures thereof, with the balance being polytetrafluoroethylene. A sliding member, which is a resin composition containing 6. Magnesium silicate converts silicon dioxide into
0.0 wt% or more, 10.0 wt% magnesium oxide
The sliding member according to claim 5, wherein the sliding member is magnesium silicate containing the above and having a weight ratio of silicon dioxide to magnesium oxide in a range of 2.1 to 5.0. 7. The sliding member according to claim 5, wherein the resin composition further contains 5% by weight or less of molybdenum disulfide, 4% by weight or less of graphite, or 5% by weight or less of conductive carbon black. 8. The sliding member according to claim 5, wherein the resin composition further contains 4% by weight or less of graphite and 5% by weight or less of conductive carbon black.