JPS6021541B2 - Sliding member coated with synthetic resin and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sliding member in which a thin layer of an oil-impregnated thermoplastic synthetic resin composition is applied to the surface of a metal material via an adhesive layer and a thermoplastic synthetic resin intermediate layer. The present invention relates to a manufacturing method thereof.

In general, synthetic resins have excellent inherent properties such as low friction and wear resistance, so they are widely used as sliding members such as bearings. However, they also have low thermal conductivity, and thermoplastic synthetic resins However, it has drawbacks such as reduced load resistance at high temperatures.

In order to take advantage of the advantages of the synthetic resin described above and improve the disadvantages, we formed a porous sintered metal layer on a steel plate,
Various sliding members have been developed in which the sintered metal layer is impregnated with a synthetic resin, or an adhesive layer is formed on a steel plate, and the adhesive layer is coated with a synthetic resin.

In the former driving member, since the synthetic resin forming the sliding surface is impregnated into the porous brazed metal layer, problems such as peeling between the brazed metal layer and the synthetic resin do not occur. In the latter case, problems such as peeling depend on the strength of the bond between the synthetic resin forming the sliding surface and the adhesive layer.

Furthermore, in the case of a synthetic resin containing a lubricant to improve friction and wear characteristics, the lubricant is interposed between the synthetic resin and the adhesive layer, and strong bonding force cannot be expected between the two.

In order to firmly bond this oil-containing synthetic resin onto a steel plate through an adhesive layer, the present applicant previously proposed an adhesive layer in the adhesive layer in Mochika Sho 46-52828 (Special Seki Sho 48-19673). We proposed a Numakin member that contains a synthetic resin of the same quality or the same series as the synthetic resin that is applied on top, and an oil-impregnated synthetic resin that contains a lubricant in the synthetic resin that is applied on the adhesive layer. .

However, although this Sakadobumura achieved strong bonding force between the adhesive layer and the oil-containing synthetic resin, the bonding force between the adhesive layer and the steel plate was weak, and peeling occurred at the relevant part. The problem was seen and issued.

This invention utilizes the bonding technology between an adhesive layer and an oil-impregnated synthetic resin, which was successfully developed in the technology of Tokugan No. 46-52828, to improve bog members made by firmly bonding an oil-impregnated synthetic resin onto a steel plate. It is related. That is, an adhesive layer is provided on the surface of a metal material, a uniform thin layer of thermoplastic synthetic resin having a high affinity for the adhesive is formed as an intermediate layer on the adhesive layer, and the adhesive layer is formed on the intermediate layer. A thermoplastic synthetic resin having an affinity for the thermoplastic synthetic resin constituting the intermediate layer is used as a base plastic, and an oil-impregnated synthetic resin composition containing a tetrafluoroethylene resin and a lubricating oil agent is used as a base plastic, or the intermediate layer is constituted by The base plastic is a thermoplastic synthetic resin that has an affinity for the thermoplastic synthetic resin selected as the base plastic, and contains a thermoplastic synthetic resin other than the synthetic resin selected as the base plastic, a tetrafluoroethylene resin, and a lubricant. The present invention provides a sliding member formed by subjecting an oil-containing synthetic resin composition to the base plastic as a continuous phase, and a method for manufacturing the same. The main metal materials used in this invention are keys, ferrous metals such as cast iron, aluminum, zinc, copper, and alloys thereof. The surface of the metal material may be as-rolled or machined, but it is more desirable if it has been shot-plast or acid-washed in accordance with conventional methods.In any case, it should be degreased and clean. shall be.

The adhesive must have strong adhesion to the underlying metal material;
It has both properties of high affinity with the thermoplastic synthetic resin that is layered on top of it, such as phenolic resin, polyester resin, epoxy resin, phenol-modified alkyd resin, furan resin, and tetrafluoric resin. The material is selected from synthetic resins such as ethylene hexafluoride propylene copolymer, and organic titanium esters such as tetralinepropyl titanate.

These may be applied in powder form to the metal surface to form an adhesive layer, but they are usually dissolved or suspended in a volatile solvent and applied by spraying or brushing. The resulting dry cured coating is typically 5 to 30 microns thick.

The thermoplastic synthetic resin intermediate layer applied on this adhesive layer is
Furthermore, a thermoplastic synthetic resin is used that has an affinity for the main thermoplastic synthetic resin that is deposited thereon to form the sliding surface layer.

The thermoplastic synthetic resin that forms this intermediate layer includes polyamide (nylon) resin, polyoxymethylene (polyacetal) resin, and polyphenylene oxide resin that have a high affinity with the adhesive that forms the selected adhesive layer. ,
The resin is selected from polyphenylene sulfide resin, polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene copolymer, polyolefin resin, and polyurethane resin.

Then, this thermoplastic synthetic resin is dispersed in the form of fine powder onto the adhesive layer and is uniformly fused, but the thickness of the intermediate layer formed in this way is 50 to 200 mm.
Preferably, it is in the micron range.

A thin layer of an oil-impregnated thermoplastic synthetic resin composition forming a drinking surface is deposited on this intermediate layer.

The thermoplastic synthetic resin used is a thermoplastic synthetic resin that has an affinity with the thermoplastic synthetic resin selected for the intermediate layer, and includes polyJamide (nylon) resin, polyoxymethylene (polyacetal) resin, polyphenylene oxide resin, It is selected from polyphenylene sulfide resin, polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene copolymer, and polyolefin resin.

These thermoplastic synthetic resins can be prepared by using one of them as a base plastic and a powder composition containing a tetrafluoroethylene resin and a lubricant, or using one of these as a base plastic and adding a base plastic to this. It is applied as a powder composition containing any one or more of the above-mentioned thermoplastic synthetic resins other than the synthetic resins selected as the above-mentioned synthetic resins, a tetrafluoroethylene resin, and a lubricating oil agent.

Note that these powder compositions may contain a solid lubricant and/or a filler.

In this invention, having "compatibility" means: ■ When a chemical bond is formed between the synthetic resins used in each layer; @ When the synthetic resins used in each layer are the same and melt into one body , Q If the synthetic resins used in each layer are compatible with each other, in other words, the solubility parameter of both -(
SP values) have close values,
When melting and diffusion is effectively performed between the two, it is a combination of the two.

In ■, a combination of a phenol resin, a phenol-modified alkyd resin adhesive layer and a nylon resin intermediate layer is used, and in @, for example, a 12-nylon resin intermediate layer is a combination of an oil-impregnated synthetic resin containing 12-nylon resin as the base plastic. Combinations of composition fluid surface layers, and in Q, combinations of similar synthetic resins, such as polyolefins [polyethylene (SP value around 8.0)] with different average molecular weights, or combinations of similar synthetic resins with different average molecular weights, or with different carbon numbers in the main chain. Different 11-nylon resin and 12-nylon resin (
This corresponds to a combination of SP values around 13).

Here, examples of desirable combinations of the above-mentioned adhesive and the base plastic of the intermediate layer and the alcoholic surface layer are shown in the table below.

In the present invention, the synthetic resin composition is used in the form of a powder, and the particle size of the base plastic is preferably a fine powder of 100 mesh or less, preferably 150 mesh or less.

The thermoplastic synthetic resin blended into the composition as a second component is blended in an amount smaller than the amount of the base plastic, and
Crab volume % or less, desirably 4 cracked amount % or less. The lubricant in the oil-containing synthetic resin composition includes those that are liquid at room temperature or liquid at temperatures up to the melting point of the thermoplastic synthetic resin, such as key oils such as engine oil, cylinder oil, and turbine oil, castor oil, Animal fats and oils such as shark liver oil and lard, synthetic lubricating oils such as silicone oil and fluorine oil, and waxes such as paraffin wax are used.

These lubricating oil agents are blended at a ratio of 3 to 2% by volume.

If it is less than 3% by volume, the self-lubricating property is insufficient, and if it is less than 2% by volume,
If it exceeds this amount, the adhesion of the composition to the underlying intermediate layer will be adversely affected.

In addition, as a powder composition, the wettability due to the oil agent becomes strong, inhibiting smooth powder fluidity, and adversely affecting the dispersion and supply for forming a thin layer. Tetrafluoroethylene resin is 10 mic.

A powder with a particle size of 5 to 1% by volume is used.
It is blended in the proportion of If the content is less than 5% by volume, it will not contribute to lowering the coefficient of friction as a sliding surface layer, and if it exceeds 5% by volume, the wear resistance of the sliding surface layer will be reduced.

Furthermore, graphite, which is commonly used in synthetic resin compositions,
A solid lubricant made of soft metal powder such as molyptene disulfide or lead, or an inorganic material such as glass fiber powder or cauliflower titanate powder, or an organic fiber fine powder such as linter or phenol resin fiber powder (trade name Kynol). Fillers can be added as needed.

In particular, the filler contributes to improving the hardness of the matte surface and has the effect of improving wear resistance. If there is too much filler, it will not only inhibit the powder fluidity of the powder composition, but also impair the surface properties of the sliding surface, so the amount of filler added should be 10% by volume or less, preferably 5% by volume or less. do.
This thermoplastic synthetic resin composition is obtained by mixing the component powders and lubricating oil at room temperature, but if the lubricating oil used is a wax, it is mixed with the above components as a fine powder and kept at room temperature. Either the mixture is mixed in a wire rack, or the mixture is heated to a temperature higher than the melting point of the wax and mixed in a mesh frame.

It is particularly important that when the synthetic resin, ie, the base plastic, which is the main component in the composition is applied as a thin layer to form the sliding surface, the base plastic forms a continuous phase.

Since the sliding surface layer is oil-impregnated, there is a problem in its adhesion to the base. A thermoplastic synthetic resin that is the main component of the oil-containing thermoplastic synthetic resin composition, that is, a synthetic resin intermediate layer that has an affinity with the base plastic, is provided on the adhesive layer, and a sliding surface formed by the composition. Two conditions are particularly important in achieving the required adhesive strength when the layer is fused together with the intermediate layer: a continuous phase of the base plastic is formed. According to experiments conducted by the present inventors, the success or failure of continuous phase formation is largely determined by the composition of the components, but also depends on the particle size of the base plastic powder.

If the amount of base plastic is small or the particle size is significantly large compared to the other components, when the composition is melted into a thin layer, a continuous phase of base plastic is obtained, but surprisingly, an underlying intermediate layer is formed. Even if it is present, the adhesive strength between these two is significantly reduced. Of course, without the intermediate layer, the adhesive strength would be further reduced. The thickness of the sliding surface layer made of the synthetic resin composition is desirably between several tens of microns and several hundred microns.

It can be applied thicker if necessary, but
The purpose of this invention is not to apply a thick resin layer. By applying it thinly, it has good dimensional stability, has excellent contact with the mating material, and furthermore greatly improves load bearing capacity. It is nearly impossible to form such a thin layer on the sliding surface, especially with a thickness of 300 microns or less, using a molding method such as injection molding.

Hereinafter, the method for manufacturing a sliding member of the present invention will be explained based on examples.

Example 1 A cold-rolled steel (JIS 3310) strip was vertically washed with triclean to give a clean surface.

Apply phenol-modified alkyd resin to this surface, and
It was baked at a temperature of 50-30,000°C to form an adhesive layer 10-15 microns thick. The strip on which this adhesive layer has been formed is flooded to a temperature of 250 to 28,000 ℃, and dried powder of lauritulactam polymer (12 nylon) with a particle size of 30 microns or less (Yamaichi) is sprinkled on the adhesive layer. The mixture was then fused to form an intermediate layer having a thickness of 70-100 microns.

Next, add 10% by volume of engine oil equivalent to SAE30, 10
It is obtained by homogeneously coagulating and mixing 1% by volume of tetrafluoroethylene resin powder with a particle size of less than a micron, 2% by volume of flaky graphite powder passing through 150 mesh, and the remainder 12-nylon powder with a particle size of less than 30 microns. A powdered oil-impregnated nylon composition was sprayed and supplied onto the 12-nylon intermediate layer.
It was fused to the intermediate layer at a temperature of 0.00 to 210° and roll applied under roll pressure.

In this way, the 250 to 30
A swamp layer of oil-impregnated nylon composition having a thickness of 0 microns was obtained.

FIG. 1 is an enlarged vertical cross-sectional view of the sliding member obtained in Example 1, in which 1 is a cold rolled steel strip, 2 is a phenol-modified alkyd resin adhesive layer, 3 is a 12 nylon intermediate layer, and 4 is a nylon intermediate layer. is a sliding surface layer made of an oil-impregnated nylon composition.

This sliding member can be used as it is in the form of a plate, or it can be cut into an appropriate size and rolled up to be used as a bush. Example 0 The concave spherical part (
(finished to a surface roughness of about $1) was washed with trichloride to make it a clean surface.

250% phenol-modified alkyd resin is applied to this concave spherical surface.
Baking at a temperature of ~30,000°C resulted in an adhesive layer 15-20 microns thick. The block with the adhesive layer formed thereon was kept at a temperature of 250 to 280 o'clock, and the particle size was 3.
Nylon 12 dry powder of less than 0 microns was sprinkled onto the adhesive layer and fused to form an intermediate layer having a thickness of 70-100 microns.

Next, add 8% by volume engine oil equivalent to SAE30, loo
Polyoxymethylene copolymer (polyacetal resin, trade name Duracon M90) with particle size below microns 3
Eaves volume%, 5% by volume of tetrafluoroethylene resin with a particle size of 10 microns or less, 1% by volume of molybdenum disulfide, which also has a particle size of 10 microns or less, and the remainder 12 nylon with a particle size of 30 microns or less, are uniformly mixed with Takazusa. The obtained oil-impregnated nylon composition powder was sprinkled onto the 12 nylon intermediate layer and fused to the intermediate layer at a temperature of 200 to 210 qo.

The entire body was kept in approximately this temperature range and pressed with a pressing force of 30k9/c using a mold with a convex spherical surface, and then cooled. A surface layer was formed. The spherical sliding member thus obtained has a contact property of 80% with respect to the mating spherical member.
% or more, which was extremely good, and the adhesion of the sliding surface layer to the base was also extremely strong. FIG. 2 is an enlarged vertical cross-sectional view of the spherical sliding member obtained in Example 1.
2 is a block made of carbon steel for machine structural use, 2 is a phenol-modified alkyd resin adhesive layer applied to its partially concave spherical surface, 3 is a 12-nylon intermediate layer, and 4 is a sliding surface layer made of an oil-impregnated nylon composition. be. In addition, 5 is a conduit for distributing the 12-nylon powder used to form the intermediate layer, 6 is a conduit for supplying and dispersing the oil-impregnated nylon composition powder used to form the sliding surface layer, and 7 is a conduit for distributing the oil-impregnated nylon composition powder used to form the sliding surface layer. It is a mold with a convex spherical surface.

As explained above, this invention applies a thermoplastic synthetic resin having an affinity for the thermoplastic synthetic resin used for the intermediate layer to the surface of the metal material via an adhesive layer and a thermoplastic synthetic resin intermediate layer. The sliding surface is formed by applying a thin layer of an oil-containing thermoplastic synthetic resin composition as a base plastic, and the thin resin layer provides excellent dimensional stability and load resistance, as well as self-lubrication. The sliding surface layer has excellent adhesion to the substrate, and also has excellent contact with the mating layer.

[Brief explanation of drawings]

FIGS. 1 and 2 are vertical cross-sectional views showing enlarged main parts of the liquor club of the present invention. 1...Metal material, 2...Adhesive layer, 3
...Middle layer, 4...Sliding surface layer. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A slide formed by adhering an adhesive layer on the surface of a metal material, a thermoplastic synthetic resin intermediate layer on the adhesive layer, and a thermoplastic synthetic resin sliding surface layer on the intermediate layer. In the moving member, the adhesive layer is selected from phenolic resin, polyester resin, epoxy resin, phenol-modified alkyd resin, furan resin, tetrafluoroethylene hexafluoropropylene copolymer, organic titanium ester, and the intermediate layer is selected from the above-mentioned adhesive layer. Polyamide resins, polyoxymethylene resins, polyphenylene oxide resins, polyphenylene sulfide resins, polyalkylene terephthalate resins, tetrafluoroethylene hexafluoropropylene copolymers, polyolefins that have high affinity with the selected adhesive layer. The sliding surface layer is made of one type of thermoplastic synthetic resin selected from resins and polyurethane resins, and the sliding surface layer is made of polyamide resin, polyoxymethylene resin, polyphenylene resin, etc., which has an affinity with the thermoplastic synthetic resin selected as the intermediate layer. The base plastic is one type of thermoplastic synthetic resin selected from nylene oxide resin, polyphenylene sulfide resin, polyalkylene terephthalate resin, tetrafluoroethylene hexafluoride propylene copolymer, and polyolefin resin, and A synthetic resin composition comprising 5 to 10% by volume of ethylene resin and 3 to 20% by volume of a lubricant, and is formed using the base plastic as a continuous phase. sliding members. 2. In a sliding member formed by adhering an adhesive layer on the surface of a metal material, a thermoplastic synthetic resin intermediate layer on the adhesive layer, and a thermoplastic synthetic resin sliding surface layer on the intermediate layer, the adhesive The adhesive layer is selected from phenolic resin, polyester resin, epoxy resin, phenol-modified alkyd resin, furan resin, tetrafluoroethylene hexafluoropropylene copolymer, and organic titanium ester, and the intermediate layer is selected from the selected adhesive layer. Select from polyamide resins, polyoxymethylene resins, polyphenylene oxide resins, polyphenylene sulfide resins, polyalkylene terephthalate resins, tetrafluoroethylene hexafluoropropylene copolymers, polyolefin resins, and polyurethane resins that have a high affinity for The sliding surface layer is made of polyamide resin, polyoxymethylene resin, polyphenylene oxide resin, polyphenylene oxide resin, polyoxymethylene resin, polyphenylene oxide resin, polyphenylene oxide resin, polyoxymethylene resin, polyphenylene oxide resin, etc., which has an affinity with the thermoplastic synthetic resin selected as the intermediate layer. One type of thermoplastic synthetic resin selected from rensulfide resin, polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene copolymer, and polyolefin resin is used as the base plastic, and a synthetic resin selected as the base plastic is used as the base plastic. Any one or more of the above thermoplastic synthetic resins other than resins and 40% by volume or less, tetrafluoroethylene resin 5 to 1
1. A sliding member coated with a synthetic resin, characterized in that it is made of a synthetic resin composition containing 0% by volume and 3-20% by volume of a lubricant, and is formed using the base plastic as a continuous phase. 3 (A) Clean the surface of the metal material and apply a resin selected from phenolic resin, polyester resin, epoxy resin, phenol-modified alkyd resin, furan resin, tetrafluoroethylene hexafluoropropylene copolymer, and organic titanium ester to the surface. a step of providing one type of adhesive layer, (B) a polyamide resin, polyoxymethylene resin, polyphenylene oxide resin, polyphenylene sulfide resin having high affinity with the adhesive on the selected adhesive layer; , a thermoplastic synthetic resin powder selected from polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene copolymer, polyolefin resin, and polyurethane resin is dispersed to fuse a uniform thin intermediate layer of the resin. (C) forming a polyamide resin, polyoxymethylene resin, polyphenylene oxide resin, polyphenylene sulfide resin, polyphenylene sulfide resin, or The base plastic is one type of thermoplastic synthetic resin powder selected from alkylene terephthalate resin, tetrafluoroethylene hexafluoride propylene copolymer, and polyolefin resin, and 5 to 10% by volume of tetrafluoroethylene resin powder and lubricating oil agent. 3
(D) Sprinkling the synthetic resin composition powder containing ~20% by volume on the intermediate layer at a temperature above the solidification temperature of the base plastic and below 100°C, which exceeds the melting point of the base plastic. (E) a step of keeping the temperature within the temperature range and pressing the fusion layer of the synthetic resin composition, and then cooling the whole to form a sliding surface layer with the base plastic as a continuous phase; Above (A), (B), (
A method for manufacturing a sliding member coated with a synthetic resin, comprising the steps of C), (D) and (E). 4 (A) Clean the surface of the metal material and apply a resin selected from phenolic resin, polyester resin, epoxy resin, phenol-modified alkyd resin, furan resin, tetrafluoroethylene hexafluoropropylene copolymer, and organic titanium ester to the surface. a step of providing one type of adhesive layer, (B) a polyamide resin, polyoxymethylene resin, polyphenylene oxide resin, polyphenylene sulfide resin having high affinity with the adhesive on the selected adhesive layer; , a thermoplastic synthetic resin powder selected from polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene copolymer, polyolefin resin, and polyurethane resin is dispersed to fuse a uniform thin intermediate layer of the resin. (C) forming a polyamide resin, polyoxymethylene resin, polyphenylene oxide resin, polyphenylene sulfide resin, polyphenylene sulfide resin, or A thermoplastic synthetic resin powder selected from alkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene copolymer, and polyolefin resin is used as the base plastic, and the above-mentioned thermoplastic resin other than the synthetic resin selected as the base plastic is used as the base plastic. Sprinkling a synthetic resin composition powder containing at least 40% by volume of any one of synthetic resin powders, 5 to 10% by volume of tetrafluoroethylene resin powder, and 3 to 20% by volume of lubricating oil, (D) The synthetic resin composition powder is heated at a temperature equal to or higher than the solidification temperature of the base plastic and at a temperature exceeding the melting point of the base plastic.
(E) a step of fusing the intermediate layer at a temperature of 0° C. or lower;
Steps of pressing the fusion layer of the synthetic resin composition while maintaining the temperature within the range, and then cooling the entire body to form a sliding surface layer with the base plastic as a continuous phase. Above (A) and (B)
, (C), (D) and (E).