JPH1036523A - Multilayer sliding member impregnated and coated with resin and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject member having remarkably excellent abrasion resistance under high load and prolonged life by impregnating and coating the pore and surface of a porous material with an epoxy resin composition containing respectively specific curing agent and solid lubricant. SOLUTION: Pores and surface of a porous material are impregnated and coated with an epoxy resin composition containing (A) dicyandiamide as a curing agent and (B) one or more substances selected from graphite, molybdenum disulfide, tungsten disulfide, lead and lead oxide as a solid lubricant. The porous material is e.g. a sintered porous metal produced by using powder of a metal such as copper, lead, bronze, etc. The pore ratio of the porous material is preferably 30-50%. The amounts of the components A and B are preferably 5-15 pts.wt. and 10-50 pts.wt. based on 100 pts.wt. of the epoxy resin, respectively. The objective member is produced by applying paste of the above epoxy resin composition to the surface of the porous material and heating the coated product to effect the impregnation of the paste into the pore of the porous material simultaneously to the curing of the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a porous epoxy resin composition which is suitable for applications such as compressors for air conditioners and automatic transmissions for automobiles, which are required to have high load resistance and long life. Resin-impregnated coated multi-layer sliding member that is impregnated and coated on a porous base material, and has very little wear even under high load conditions and in solid contact (boundary lubrication) or oil-out (depleted lubrication) environment The present invention relates to a sliding member and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, various types of mechanical devices such as industrial machines have been demanded to reduce the size and cost of structural members.
The number of cases of switching from "rolling bearings" to "slide bearings" is increasing. Above all, due to the low cost advantage, the use of the multi-layer sliding bearing in which the resin according to the present invention is coated on the surface is increasing.

Further, as a resin in this case, at present,
Polytetrafluoroethylene having low friction characteristics (trade name “Teflon” or the like, hereinafter referred to as “PTFE”)
There are many examples of using a multi-layer sliding bearing as a base. The present applicant has already proposed a multilayer sliding member impregnated with such a PTFE composition (Japanese Patent Application Laid-Open No. 60-104191).

[0004]

By the way, the PTFE-based multi-layer sliding member exhibits low abrasion and exhibits good friction characteristics under a low to medium load operating condition with a contact pressure of 400 kgf / cm ² or less. However, at a high load exceeding 400 kgf / cm ² , there is a problem that wear is extremely large and it is difficult to use the bearing for a long life.

More specifically, in a reverse clutch drum used in the above-mentioned automatic transmission of an automobile, a bearing is applied with a bearing pressure of 500 kgf / cm ² or more.
Since the FE-based multi-layer sliding member has a problem that it is extremely worn and difficult to cope with, there has been a problem to solve such a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a remarkably excellent abrasion resistance under a high load. It is an object of the present invention to provide a resin-impregnated coated multilayer sliding member that is possible.

[0007]

Means for Solving the Problems The present inventors have proposed a conventional P
As a result of examining the wear of the TFE-based multi-layer sliding member under high load from various angles by a test method described later, the cause is as follows.
It was found that the compressive strength of the PTFE resin was low.

Here, the progress of wear of the resin-coated multilayer sliding member under a high load will be described. The resin layer thickness of the surface layer of the resin-coated multilayer sliding member is about 10 to 20.
It is about μm. Then, when the use of the resin-coated multilayer sliding member as a bearing is started, first, wear of the surface resin layer starts (initial wear). When the wear of the surface resin layer is finished, the wear of the metal-resin mixed surface in which the porous sintered metal and the resin are mixed starts (steady wear). A bearing having less wear in the steady wear region can be evaluated as a better bearing, in other words, an excellent bearing having a longer life.

From such basic evaluations and considerations, it is considered that it is the material properties of the resin that contribute to the life of the bearing under the use of a high load, and that it is desirable to use a resin having higher compressive strength. Reached the present invention in which the epoxy resin composition was impregnated and coated. Incidentally, the compressive strength of the conventional PTFE resin is about 1.2 kgf / cm ² , and the compressive strength of the epoxy resin used in the present invention is about 10 times that.

That is, the resin-impregnated coated multi-layer sliding member according to the present invention, which is also suitable for high-load applications, is characterized in that a solid lubricant is applied to the pores of the porous material and the surface thereof. What is claimed is: 1. A resin-impregnated coated multi-layer sliding member obtained by impregnating and coating an epoxy-based resin composition, wherein the epoxy-based resin composition comprises dicyandiamide as a curing agent and graphite, molybdenum disulfide, and tungsten disulfide as a solid lubricant. , Lead, and lead oxides.

In the embodiment of the resin-impregnated coated multi-layer sliding member according to the present invention, the porous material is made of a porous metal sintered material. In addition, as described in claim 3, the porous metal sintered material is made of a lead-bronze-based alloy, and has a porosity of 30% or more and less than 50%.

Similarly, in an embodiment of the resin-impregnated coated multi-layer sliding member according to the present invention, as described in claim 4, the content of dicyandiamide as a curing agent is based on 100 parts by weight of epoxy resin. The solid lubricant is graphite, and the content of the graphite is 10 to 50 parts by weight based on 100 parts by weight of the epoxy resin. Things.

Similarly, in an embodiment of the resin-impregnated coated multi-layer sliding member according to the present invention, as described in claim 6, the porous material is formed on a backup material such as a steel back metal. In other words, the structure can be provided with required rigidity or strength.

According to a seventh aspect of the present invention, there is provided a method for producing a resin-impregnated coated multi-layer sliding member which is suitable for use under a high load, wherein dicyandiamide as a curing agent is provided on the surface of the porous material. And a paste of an epoxy resin composition containing at least one of graphite, molybdenum disulfide, tungsten disulfide, lead, and lead oxide as a solid lubricant, and then heating the epoxy resin composition The paste is characterized in that the viscosity of the paste is reduced so that the paste penetrates into the pores of the porous material and is cured by heating.

In a preferred embodiment of the method for producing a resin-impregnated coated multilayer sliding member according to the present invention, the porous material is a porous metal sintered material. Can be manufactured by sintering metal powder sprayed on a backup material such as a steel backing,
As described in claim 9, the porous metal sintered material is a lead-bronze-based alloy, and its porosity can be set to 30% or more and less than 50%.

Similarly, in an embodiment of the method for manufacturing a resin-impregnated coated multi-layer sliding member according to the present invention, claim 10
As described in the above, the content of dicyandiamide as a curing agent (may include an appropriate curing accelerator) can be 5 to 15 parts by weight with respect to 100 parts by weight of the epoxy resin, As described in claim 11, graphite is used as a solid lubricant, and the content of graphite can be 10 to 50 parts by weight with respect to 100 parts by weight of the epoxy resin. As noted, the heat cure temperature can be between 100 and 240 ° C.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A resin-impregnated coated multi-layer sliding member and a method of manufacturing the same according to the present invention, which are suitable for high-load applications, have the above-mentioned construction. The sliding member can be manufactured by the following procedure.

<Step I> Preparation of Porous (Metal Sintered) Material A metal powder is sprayed at a predetermined thickness on a back-up material such as a steel plate as a backing of a sliding member. And sintering without pressing to produce a porous (sintered metal) material. In this case, the porosity of the porous (sintered metal) material is desirably 30% or more and less than 50%. By setting such a porosity, the function of lowering the frictional force of the resin to be impregnated is reduced. A well-balanced strength maintaining function of the porous (sintered metal) material of the matrix provides a sliding member having good wear resistance. As the metal powder to be used, copper, a copper alloy, aluminum or the like can be mentioned, and it is desirable to select according to the purpose of use. In the case of a copper alloy, a lead-bronze-based alloy can also be used.

<Step II> Preparation of Paste of Epoxy Resin Composition for Impregnation Coating To a liquid epoxy resin, dicyandiamide and graphite or a solid lubricant such as molybdenum disulfide or tungsten disulfide is added as a hardening agent, and a milky stick or the like is added. To prepare a paste for impregnation. Here, there is a solid epoxy resin, but the porous (metal sintered) material has poor permeability to the pores and is difficult to use in the present invention.

Other than the dicyandiamide specified in the present invention, as a curing agent for the epoxy resin, a room temperature curing type curing agent represented by ethylenediamine, and a heat curing type curing agent represented by boron trifluoride / monoethylamine. There are many types such as hardeners, but the material properties related to abrasion resistance, the gelation time related to the permeability of porous (metal sintered) material into pores, and the storage stability of paste materials The curing agent used in the present invention is specified as dicyandiamide. The amount of dicyandiamide is preferably 5 to 15 parts by weight based on 100 parts by weight of the epoxy resin.

In the paste of the epoxy resin composition used in the present invention, a solid lubricant is also an essential component because the epoxy resin has no self-lubricating property. As the solid lubricant, in addition to graphite, molybdenum disulfide, and tungsten disulfide, lead and lead oxide can be used, and are selected according to the purpose of use. The amount of the solid lubricant is preferably 10 to 50 parts by weight based on 100 parts by weight of the epoxy resin. In this case, 10
If the amount is less than 50 parts by weight, the effect of complementing the lubrication is weak.
If the content is more than 10% by weight, the thixotropic property of the resin paste becomes too high, causing a problem that the resin paste hardly penetrates into the pores of the porous (sintered metal) material.

<Step III> Preparation of Resin Impregnated Coated Multi-Layer Sliding Member On the porous (metal sintered) material prepared in Step I, paste the impregnated coating epoxy resin composition prepared in Step II. Then, it is placed in a heating furnace to cure the epoxy resin, thereby producing a multi-layer sliding member in which the resin is impregnated and coated in the pores and the surface of a porous (sintered metal) material. In this case, the paste of the epoxy resin composition is a honey-like slightly viscous paste at room temperature. However, the viscosity decreases to a state close to water due to heat at the time of heating and curing, and a porous (metal sintered) material is formed. Since the epoxy resin composition permeates the pores evenly, there is no major problem in the filling property of the epoxy resin composition into the pores.

Since the temperature and time during heat curing slightly affect the physical properties of the cured epoxy resin, its management is important. The heat curing temperature is 100 to 240 ° C, preferably 14
The range is from 0 to 200 ° C. In this case, if the temperature is lower than 100 ° C., the curing is insufficient, and if the temperature exceeds 240 ° C., a problem such as decomposition may occur. The heat curing time may be set according to the processing temperature. In addition, 100-150 degreeC
When it is desired to cure in a medium temperature range and in a short time, in addition to dicyandiamide, for example, a curing accelerator which does not impair the storage stability of the urea-based paste may be blended.

<Step IV> Processing of Resin Impregnated Coated Multi-Layer Sliding Member into Parts The resin impregnated coated multi-layer sliding member according to the present invention has a relatively thin resin layer on its surface, so that, for example, a thrust washer or the like is used. In addition to flat parts, it can be applied to cylindrical bush parts. Further, when higher precision is required for these parts, the required precision can be met by cutting or grinding the mixed surface of metal and resin by machining.

[0025]

The present invention will be described in more detail with reference to the following examples.

Example <Step IA> Production of Porous Metal Sintered Material The thickness of the steel backing metal: 1.23 mm, width: 150 mm,
Length: 300-mm steel plate, particle size 20-120μ
bronze based alloy containing JIS m lead (JIS H 5115 LB
A composition equivalent to C3. ) Was sprayed at a thickness of 600 μm and sintered in a reducing atmosphere furnace at 810 ° C. for 20 minutes. By this firing, the sintered layer having a porosity of 42% has a thickness of 4%.
A 60 μm porous metal sintered material was obtained.

<Step II-A> Preparation of Paste of Epoxy Resin Composition for Impregnation Coating Epoxy resin liquid at room temperature (trade name, manufactured by Asahi Denka Co., Ltd.)
(Adeka Resin EP-4100E) 100 parts by weight of dicyandiamide as a curing agent (manufactured by Asahi Denka Co., Ltd., trade name:
8 parts by weight of ACR hardener H-3636AS and graphite as a solid lubricant (manufactured by Oriental Sangyo Co., Ltd.)
30 parts by weight of trade name: OS carbon powder USS-20) were added, and the mixture was kneaded with a milk stick for 1 hour to obtain a paste of the epoxy resin composition for impregnation coating. This paste was an odorless, flowable, honey-like composition.

<Step III-A> Preparation of Epoxy Resin Impregnated Coated Multi-Layer Sliding Member The width: 150 mm, length: 30 prepared in Step IA.
A paste of the epoxy resin composition prepared in Step II-A was applied on a 0 mm porous metal sintered material, and the paste was evenly leveled with a gold spatula. Next, the paste of the epoxy resin composition is put into a heating furnace at 180 ° C. for 1 hour to allow the paste of the epoxy resin composition to penetrate into the pores of the porous metal sintered material and to be cured. A resin-impregnated coated multilayer sliding member was obtained.

As shown in FIG. 1, an epoxy resin-impregnated coated multi-layer sliding member 1 according to an embodiment of the present invention has a bronze alloy layer (porous metal sintered) containing lead in a sintered state on the surface of a steel back metal 2. Material) 3
And the pores of the porous metal sintered material 3 are uniformly filled with the epoxy resin composition 4 in a cured state, and the average thickness of the surface epoxy resin layer is 1
The cured state was good at 5 μm.

<Step IV-A> Preparation of Test Piece for Evaluation of Epoxy Resin Impregnated Coated Multi-Layer Sliding Member From the epoxy resin impregnated coated multi-layer sliding member obtained in Step III-A, width: 35 mm, length : Strips of 110 mm were cut out, and the strips were further ground by 100 μm with a surface grinder to evaluate the properties of the metal-resin mixed surface, thereby obtaining test pieces for friction and wear evaluation.

Comparative Example <Step IB> Preparation of Paste of PTFE Resin Composition for Impregnation Coating Based on the example described in JP-A-60-104191, the following method was used to prepare the PTFE resin composition for impregnation coating. A paste was prepared. That is, 100 parts by weight of flaky lead oxide having an average particle size of 30 μm was added to 100 parts by weight of the PTFE resin dispersion, and the mixture was kneaded with a milk stick for 1 hour to obtain a paste of the PTFE resin composition for impregnation coating.

<Step II-B> Preparation of PTFE Resin Impregnated Coated Multi-Layer Sliding Member The width obtained in step IA of the above-mentioned embodiment: 150 m
m, a paste of the PTFE resin composition prepared in Step IB of the comparative example was applied on a porous metal sintered material having a length of 300 mm, and then the resin composition paste was passed through a roll to remove the porous metal paste. The sintered material was impregnated and coated. next,
This impregnated coating material is placed in a heating furnace at 370 ° C. for 20 minutes,
The TFE resin composition was fired to obtain a resin-impregnated coated multilayer sliding member of a comparative example.

<Step III-B> Preparation of Test Piece for Evaluation of PTFE Resin Impregnated Coated Multilayer Sliding Member Obtained in Step II-B of the above comparative example in the same manner as in Step IV-A of the above embodiment. A strip having a width of 35 mm and a length of 110 mm was cut out from the PTFE resin-impregnated coated multilayer sliding member, and the strip was further ground to 100 μm with a surface grinder in order to evaluate the characteristics of the mixed surface of metal and resin. The test piece was used for abrasion evaluation.

Evaluation Test <Step IC> Confirmation of Performance of Resin Impregnated Coated Multi-Layer Slide Member of Example and Comparative Example The epoxy resin impregnated coated multi-layer slide member of the present invention manufactured in Step IV-A was manufactured. Evaluation specimen and Step I
Using the test pieces for evaluation of the PTFE resin-impregnated coated multi-layer sliding member of Comparative Example manufactured in II-B, the performance was confirmed by the tester and the test conditions shown in Table 1 and evaluated.
The result is shown in FIG.

[0035]

[Table 1]

As shown in FIG. 2, the wear of the epoxy resin impregnated coated multi-layer sliding member according to the present invention gradually increases from a low load to a high load region.

On the other hand, the wear of the PTFE resin-impregnated coated multi-layer sliding member of the comparative example increases gradually from the low load to the medium load region as in the present invention, but the load is 4 k
When gf (surface pressure exceeds 400 kgf / cm ² ), wear rapidly increases. The reason for this is considered to be the difference in the compressive strength of the resin, as described above, and the effect of the epoxy resin-impregnated coating composite layer according to the present invention was confirmed.

[0038]

According to the present invention, a resin-impregnated coated multi-layer sliding member suitable for high-load applications is provided by impregnating and coating the pores of a porous material and the surface thereof with an epoxy resin composition containing a solid lubricant. A resin-impregnated coated multi-layer sliding member comprising: an epoxy resin composition, wherein one of dicyandiamide as a curing agent and graphite, molybdenum disulfide, tungsten disulfide, lead, and lead oxide as a solid lubricant. Since it contains the above, it is also extremely excellent in abrasion resistance under high load, and greatly contributes to high performance and long life of various mechanical devices such as automobiles and industrial machines. This is a remarkably excellent effect.

And, as described in claim 2,
By using a porous material made of a porous metal sintered material, it is possible to obtain a wear-resistant layer having good thermal conductivity and evenly filling the pores with the epoxy resin composition. Significant effects are achieved.

Further, as described in claim 3, the porous metal sintered material is made of a lead-bronze-based alloy and has a porosity of 30% or more and less than 50%.
It is possible to obtain good sliding performance, and it is possible to balance the function of reducing the frictional force of the impregnated resin with the function of maintaining the strength of the porous metal sintered material of the matrix. Significant effects are achieved.

Further, as described in claim 4, the content of dicyandiamide as a curing agent is 5 to 15 parts by weight based on 100 parts by weight of the epoxy resin, so that the wear resistance is improved. It is possible to improve the physical properties involved and the permeability of the porous material into the pores, and as described in claim 5, the solid lubricant is graphite, and By setting the content to 10 to 50 parts by weight with respect to 100 parts by weight of the epoxy resin, a remarkably excellent effect that an effect of complementing lubrication can be obtained satisfactorily can be obtained.

Further, as described in claim 6, the porous member is formed on a backup material such as a steel backing metal, so that the sliding member has necessary rigidity or strength. A remarkably excellent effect is obtained.

The method for producing a resin-impregnated coated multi-layer sliding member according to the present invention, which is also suitable for high-load applications, comprises the steps of: providing dicyandiamide as a curing agent, graphite and molybdenum disulfide as a solid lubricant on the surface of a porous material; After applying a paste of an epoxy resin composition containing at least one of tungsten, tungsten disulfide, lead and lead oxide, the paste is heated to reduce the viscosity of the paste of the epoxy resin composition, thereby forming a porous material. The heat-curing and the heat-curing are carried out into the pores, so that a remarkable effect that it is possible to manufacture a sliding member having extremely excellent wear resistance under a high load can be produced.

And, as described in claim 8,
The porous material is a porous metal sintered material, which is manufactured by sintering a metal powder sprayed on a backup material such as a steel backing metal, so that the thermal conductivity is good and an epoxy-based material is used. It is possible to obtain a wear-resistant layer in which the resin composition is uniformly filled in the pores, and as described in claim 9, the porous metal sintered material is a lead-bronze-based alloy, By setting the porosity to be 30% or more and less than 50%, a remarkably excellent effect that good lubrication performance, a function of lowering the frictional force of the resin, and a function of maintaining strength can be obtained can be obtained.

Further, as described in claim 10, the content of dicyandiamide as a curing agent is set to 5 to 15 parts by weight with respect to 100 parts by weight of the epoxy resin, whereby the abrasion resistance is reduced. It is possible to improve the physical properties of the materials involved and the permeability of the porous material into the pores, and as described in claim 11,
By using graphite as a solid lubricant and setting the graphite content to 10 to 50 parts by weight with respect to 100 parts by weight of the epoxy resin, it is possible to obtain an excellent effect of complementing lubrication. The effect is brought about.

Further, by setting the heat-curing temperature to 100 to 240 ° C., the epoxy resin can be cured sufficiently sufficiently, which is a remarkable advantage. The effect is brought about.

[Brief description of the drawings]

FIG. 1 is a schematic view of a photograph of a cross-sectional structure of an epoxy resin-impregnated coated multilayer sliding member manufactured in an example of the present invention.

FIG. 2 is a graph showing the evaluation results of the abrasion resistance of the resin-impregnated coated multilayer sliding members obtained in Examples and Comparative Examples of the present invention without lubrication.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 epoxy resin impregnated coated multilayer sliding member 2 steel backing metal (backup material) 3 sintered bronze alloy layer containing lead (porous metal sintered material) 4 cured epoxy resin composition

Claims (12)

[Claims] 1. A resin-impregnated coated multi-layer sliding member obtained by impregnating and coating the pores of a porous material and the surface thereof with an epoxy resin composition containing a solid lubricant, wherein the epoxy resin composition comprises: Resin-impregnated coated multi-layer suitable for high load applications characterized by containing dicyandiamide as hardener and one or more of graphite, molybdenum disulfide, tungsten disulfide, lead and lead oxide as solid lubricant Sliding member. 2. The resin-impregnated coated multilayer sliding member according to claim 1, wherein the porous material is made of a porous metal sintered material. 3. The porous metal sintered material is made of a lead-bronze alloy and has a porosity of 30% or more and less than 50%.
The resin-impregnated coated multi-layer sliding member according to 1. 4. The resin-impregnated coated multilayer sliding member according to claim 1, wherein the content of dicyandiamide as a curing agent is 5 to 15 parts by weight based on 100 parts by weight of the epoxy resin. 5. The resin-impregnated coated multi-layer slide according to claim 1, wherein the solid lubricant is graphite, and the content of graphite is 10 to 50 parts by weight with respect to 100 parts by weight of the epoxy resin. Moving member. 6. The resin-impregnated coated multilayer sliding member according to claim 1, wherein the porous material is formed on a steel back metal. 7. An epoxy resin containing dicyandiamide as a hardening agent and at least one of graphite, molybdenum disulfide, tungsten disulfide, lead and lead oxide as a solid lubricant on the surface of a porous material. After application of the composition paste, the composition is heated to reduce the viscosity of the epoxy resin composition paste so as to penetrate into the pores of the porous material and to be cured by heating. A method for producing a resin-impregnated coated multilayer sliding member. 8. The porous material is a porous metal sintered material,
The method for producing a resin-impregnated coated multilayer sliding member according to claim 7, which is produced by sintering a metal powder sprayed on a steel backing metal. 9. The porous metal sintered material is a lead-bronze alloy having a porosity of 30% or more and less than 50%.
3. The method for producing a resin-impregnated coated multilayer sliding member according to item 1. 10. The method for producing a resin-impregnated multi-layer sliding member according to claim 7, wherein the content of dicyandiamide as a curing agent is 5 to 15 parts by weight based on 100 parts by weight of the epoxy resin. . 11. The resin-impregnated multi-layer slide according to claim 7, wherein graphite is used as the solid lubricant, and the graphite content is 10 to 50 parts by weight based on 100 parts by weight of the epoxy resin. A method for manufacturing a moving member. 12. The method for producing a resin-impregnated coated multilayer sliding member according to claim 7, wherein the heat-curing temperature is 100 to 240 ° C.