JPS6021542B2 - Method for manufacturing sliding members coated with synthetic resin - Google Patents

Description

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

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. A sliding member or steel plate in which a porous bonded metal layer is formed on a steel plate and the sintered metal layer is impregnated and coated with a synthetic resin is made by making use of the advantages of the synthetic resin described above and improving its disadvantages. Various sliding members have been developed in which an adhesive layer is formed thereon and a synthetic resin is coated on the adhesive layer.

In the former sliding member, since the synthetic resin forming the sliding surface is impregnated into the porous fried metal layer, problems such as peeling between the fried metal layer and the synthetic resin do not occur. In the latter emotional component, 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 Samurai Kaisho No. 46-52828 (Hakama Kaisho No. 48-19673). We have proposed a sliding member that contains a synthetic resin of the same quality or the same series as the synthetic resin that is deposited on it, and an oil-impregnated synthetic resin that contains a lubricant in the synthetic resin that is deposited on the adhesive layer. .

However, with this sliding member, although a strong bonding force was obtained 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 that part. Issues such as these were seen and raised.

This invention utilizes the successful bonding technology between an adhesive layer and an oil-impregnated synthetic resin disclosed in Samurai Isho No. 46-52828 to manufacture a sliding member made by firmly bonding an oil-impregnated synthetic resin onto a steel plate. It concerns the improvement of the method. That is,
An adhesive layer is provided on the surface of the metal material, a uniform thin layer of thermoplastic synthetic resin having high affinity with the adhesive is formed as an intermediate layer on the adhesive layer, and the intermediate layer is formed on the intermediate layer. A thermoplastic synthetic resin having an affinity for the thermoplastic synthetic resin constituting the layer is used as a base plastic, and an oil-containing synthetic resin composition containing a tetrafluoroethylene resin and a lubricating oil agent, or the intermediate layer is formed. A thermoplastic synthetic resin having an affinity for thermoplastic synthetic resins is used as a base plastic, and an oil-impregnated product containing a thermoplastic synthetic resin other than the synthetic resin selected as the base plastic, a tetrafluoroethylene resin, and a lubricating oil agent. The present invention provides a method for manufacturing a sliding member formed by adhering a synthetic resin composition to the base plastic as a continuous phase.

The main metal materials used in this invention are steel, ferrous metals such as cast iron, aluminum, zinc, steel, and alloys thereof.

The surface of the metal material may be a rolled or machined surface, but it may be shot blasted or machined using conventional methods.
It is even better if the surface has been acid washed, but in any case it should be degreased and clean.

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 applied by dissolving or suspending them in a volatile solvent and spraying or brushing, and if necessary, applying the adhesive layer. 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, it has the essential effect of improving the adhesion with the oil-containing thermoplastic synthetic resin composition that forms the sliding surface layer thereon, and it has the effect of improving the adhesion to the base plastic in the composition. A thermoplastic synthetic resin having compatibility and containing no additives is used.

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

This thermoplastic synthetic resin is then sprinkled onto the adhesive layer in the form of a fine powder, or a film or thin-walled molded product is placed on the adhesive layer and overflowed to form a uniform layer. Fuse as a thin layer.

The thickness of the intermediate layer formed in this way is "50~
A range of 200 microns is desirable.

A film or sheet or a thin preform made of an oil-containing thermoplastic synthetic resin composition forming a sliding surface is fused and coated onto 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 polyamide (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 are composed of either one of them as a base plastic and an oil-impregnated synthetic resin composition containing a tetrafluoroethylene resin and a lubricant, or one of them as a base plastic, and It is applied as an oil-containing synthetic resin composition containing any one or more of the above thermoplastic synthetic resins other than the synthetic resin selected as the base plastic, a tetrafluoroethylene resin, and a lubricant.

Note that these compositions may contain a solid lubricant such as molybdenum disulfide and/or a filler.

In this invention, "affinity" means: ■ When a strong intermolecular force is expected at the interface between two layers: For example, when bonding an epoxy resin adhesive to a metal surface, @ between two layers. For example, when a chemical bond is formed between a phenol resin and a nylon, or when a methylene bond is formed by the reaction of an amide group with a methylol group -CH Yuhi, ■ If the synthetic resins used are the same, Case: For example, 12 nai.

When the synthetic resins used are of the same type or the same group: For example, when the synthetic resins used are of the same type or the same type: for example, when the sliding surface layer is made of 12-nylon as a base plastic and is self-fused to the intermediate layer. Like the combination of nylon and 12-nylon, or the combination of polyethylene with different average molecular weights, the solubility parameters (SP values) of the two are close to each other, and they are compatible with each other. When the two are melted and diffused well and become one, it refers to the following properties.

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

In this invention, the oil-containing thermoplastic synthetic resin composition is prepared in advance by several tens of
It is formed into a sheet or film with a thickness of 0 microns or less, preferably 500 microns or less, more preferably 100 microns or more and 300 microns or less, by extrusion molding or calendar rolls.

However, if the object to be applied is not a flat surface, it is preformed into the desired shape as a preform with the above-mentioned thickness.

After this sheet or film or preform is superimposed on the intermediate layer, the entire body is flooded to a temperature above the solidification temperature of the base plastic and below 10,000 degrees above the melting point, and then the adhesive layer is heated. By pressing and cooling, the desired emotional surface layer can be obtained. When obtaining an emotional layer using this sheet, film, or preform, a metal material having an intermediate layer is flooded in advance to melt the intermediate layer, and then this sheet, film, etc. is added to the molten intermediate layer. It can also be superimposed on top and fused.

In any case, it is important that the sheet or film or preform has a continuous phase formed on its surface of the base plastic used.

The success or failure of continuous phase formation is primarily determined by the component composition, but is also influenced by the powder particle size of the base plastic.

If the base plastic particles are too small or the particle size is too large, it is difficult to obtain a continuous phase. Generally, the amount of base plastic will be greater than or equal to 5% by volume, preferably greater than or equal to 5% by volume.

The success or failure of continuous phase formation greatly affects the adhesive strength with the intermediate layer. The thermoplastic synthetic resin blended into the composition as a second component is blended in a smaller amount than the base plastic, and is 3% by volume or less.

The lubricant used in oil-containing thermoplastic synthetic resin compositions is
Things that are liquid at room temperature and become liquid at temperatures up to the melting point of the resin (base plastic), such as mineral oils such as engine oil, cylinder oil, and turbine oil, castor oil, shark liver oil,
Animal and vegetable oils such as lard, synthetic lubricating oils such as silicone oil and fluorine oil, and waxes such as paraffin wax are used.

The amount of this lubricant is 2 to 2% by volume, preferably 3% by volume.
~1% by volume. If the content is less than 2% by volume, the self-lubricating property will not be sufficient, and if it exceeds 20% by volume, the adhesive strength with the base will be impaired regardless of the presence or absence of an intermediate layer.

The tetrafluoroethylene resin is used as a powder having a particle size of 10 microns or less, and is blended at a ratio of 5 to 1% by cough volume.

If it is less than 5% by volume, it does not contribute to lowering the friction coefficient of the sliding surface layer, and if it exceeds 1% by volume, it reduces the wear resistance of the sliding surface layer.

In the oil-containing thermoplastic synthetic resin composition, up to 5% by volume of a conventionally commonly used solid lubricant consisting of a soft metal such as graphite, molybdenum disulfide, or lead, and/or glass fiber powder, cauliflower titanate powder, etc. A filler consisting of an organic fiber fine powder such as inorganic material, linter, or phenol resin fiber powder (trade name: Kynol) can be blended in an amount of 1 shipboard volume % or less, preferably 5 volume % or less.

Both the solid lubricant and the filler contribute to improving the wear resistance of the sliding surface, but if the blending amount exceeds the above-mentioned amount, it may affect the formability when forming into a film, sheet, or thin preform. inhibit.

Examples will be described below. Example 1 Rolled steel (
JIS G3310) The strip was polished with Triclean to give a clean surface.

Apply phenol-modified alkyd resin to this surface at 250~3
The adhesive layer was scaled at a temperature of 0.00 qo to form a 10-15 micron thick adhesive layer. The strip on which the adhesive layer has been formed is heated to a temperature of 250 to 280 oo and made of polyamide resin (12 nylon) with a particle size of 30 microns or less.
Sprinkle dry powder on the adhesive layer to make it adhere, 70~
An intermediate layer having a thickness of 100 microns was deposited. Next, engine oil equivalent to SAE30 1 cough volume%,
Tetrafluoroethylene resin fine powder 1. volume%, molybdenum disulfide powder less than 10 microns 2% by volume, and the balance 3
An oil-impregnated nylon composition was obtained by extrusion molding a mixture of 12 nylon powder of 0 micron or less into a sheet with a thickness of 320 to 350 micron. It was confirmed by microscopic observation that a continuous phase of 12-nylon was formed in this sheet-like oil-containing composition. Add this to 12 above.
- overlaid on nylon intermediate layer, totaling 200-21
The oil-impregnated nylon composition sheet was fused to the intermediate layer while maintaining the temperature at 0q0, and at the same time, it was rolled and adhered under roll pressure. The sliding surface layer made of the oil-impregnated nylon composition thus obtained was firmly adhered to the intermediate layer, and had a thickness of 300 to 310 microns. Figure 1 shows
An enlarged vertical cross-sectional view of the sliding member obtained in Example 1,
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 sliding surface layer made of an oil-impregnated nylon composition. This sliding member can also be used by cutting it as it is in the form of a plate.
Moreover, it can also be used as a bush by cutting it into an appropriate size and rolling it up with the sliding surface layer inside.

Example 0 The concave spherical surface of a block made of mechanical structural carbon steel (JIS ○4051) having a concave spherical surface of approximately hemisphere or smaller was refined using trichlene to give a clean surface.

The surface roughness of this concave spherical portion is finished to about $1.
250% phenol-modified alkyd resin is applied to this concave spherical surface.
A 15-20 micron thick adhesive layer was formed by heating at a temperature of -300°C.

The block on which this adhesive layer was formed was made from 250~
12 with a particle size of 30 microns or less kept at a temperature of 280 qo
- Nylon dry powder was sprinkled onto the adhesive layer and fused to form an intermediate layer having a thickness of 70-100 microns.

Next, the oil-impregnated nylon composition was preformed into a cup shape with an average wall thickness of 320 μm, and then iron was attached to the concave spherical surface.

This oil-impregnated nylon composition contains 8% by volume of engine oil equivalent to SAE3, {0)
Polyoxymethethylene copolymer (boriacetal resin, trade name Duracon M90) with a particle size of 100 microns or less 3% by volume, 5% by volume of tetrafluoroethylene resin with a particle size of 10 microns or less, 0 disulfide with a particle size of 10 microns or less Consisting of molybdenum powder 1% by weight, the balance being 12 nylon with a particle size of 30 microns or less,
As a result of microscopic observation, it was confirmed that a continuous phase of nylon 12 was formed in the preform.

When the whole was kept at a temperature of 200 to 210 oo, the cup-shaped preform iron-bonded to the concave spherical surface was fused to the intermediate layer on the concave spherical surface.

Keeping the whole body at this temperature and using a mold with a convex spherical surface,
After pressurizing with a pressing force of k9/average, it was cooled to form a sliding surface layer made of an oil-free nylon composition having a thickness of about 300 microns. The spherical sliding member thus obtained has extremely good contact properties with the mating spherical member of 80% or more, and the adhesion to the base of the sliding surface layer is also extremely strong. Ta.

FIG. 2 is an enlarged vertical cross-sectional view of the spherical floating member obtained in Example D', in which 1 is a block made of carbon steel for mechanical structure, and 2 is a phenol-modified coating applied to the concave spherical surface. le.
A kid resin adhesive layer, 3 a 1210 nylon intermediate layer, and 4 a sliding surface layer made of an oil-impregnated nylon composition.

In addition, in FIG. 3, 41 is a cup-shaped preform made by injection molding to form the sliding surface layer 4. 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. A film or sheet or a thin preform made of an oil-containing thermoplastic synthetic resin composition as a base plastic is used as a sliding surface layer, and the thinness of the resin layer improves dimensional stability and load resistance. It has the following characteristics: it has oil-impregnating properties, so it has self-lubricating properties, and the sliding surface layer has excellent adhesion to the substrate and excellent contact with the mating material.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views showing enlarged main parts of a sliding member obtained by the manufacturing method of the present invention, and FIG.
The figure is a perspective view showing a preformed product of an oil-containing thermoplastic synthetic resin composition used as a fluid surface layer. 1...metal material, 2...adhesive layer, 3...
...Middle layer, 4...Sliding surface layer. *Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1 (A) The surface of the metal material is cleaned and a phenol resin, a polyester resin, an epoxy resin, a phenol-modified alkyd resin, a furan resin, a tetrafluoroethylene hexafluoropropylene copolymer, A step of providing an adhesive layer of one type selected from organic titanium esters, (B) a polyamide resin, a polyoxymethylene resin, a polyphenylene oxide resin having a high affinity with the adhesive on the selected adhesive layer; , polyphenylene sulfide resin,
A step of fusion-forming a uniform thin intermediate layer of one type of thermoplastic synthetic resin selected from polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene copolymer, polyolefin resin, and polyurethane resin, (C) Polyamide resin, polyoxymethylene resin, polyphenylene oxide resin, polyphenylene sulfide resin, polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene having affinity with the thermoplastic synthetic resin selected for the intermediate layer. A synthetic resin composition comprising a thermoplastic synthetic resin selected from copolymers and polyolefin resins as a base plastic, and containing 5-10% by volume of tetrafluoroethylene resin and 2-20% by volume of lubricant. forming a film or sheet or thin-walled preform from the base plastic as a continuous phase;
(D) The film or sheet or thin preform of the synthetic resin composition obtained in step (C) above is superimposed on the intermediate layer at a temperature of at least 100°C, which is above the solidification temperature of the base plastic and above the melting point. (E) a step of pressing the fused layer of the synthetic resin composition while keeping it within the temperature range, and then cooling the whole to form a sliding surface layer of the synthetic resin composition; A), (B), (C
), (D) and (E). 2 (A) Clean the surface of the metal material and apply a material selected from phenolic resin, polyester resin, epoxy resin, phenol-modified alkyd resin, furan resin, tetrafluoroethylene hexafluoropropylene copolymer, and organic titanium ester to the surface. (B) forming a polyamide resin, polyoxymethylene resin, polyphenylene oxide resin, or polyphenylene sulfide having high affinity with the adhesive on the selected adhesive layer; resin,
A step of fusion-forming a uniform thin intermediate layer of one type of thermoplastic synthetic resin selected from polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene copolymer, polyolefin resin, and polyurethane resin, (C) Polyamide resin, polyoxymethylene resin, polyphenylene oxide resin, polyphenylene sulfide resin, polyalkylene terephthalate resin, tetrafluoroethylene hexafluoropropylene having affinity with the thermoplastic synthetic resin selected for the intermediate layer. Contains 50% by volume or more of one type of thermoplastic synthetic resin selected from copolymers and polyolefin resins as a base plastic, and 30% by volume of one or more of the above thermoplastic synthetic resins selected as the base plastic. Hereinafter, a step of forming a film or sheet or a thin preform having the base plastic as a continuous phase from a synthetic resin composition containing 5 to 10 volume % of a tetrafluoroethylene resin and 2 to 20 volume % of a lubricant; (D) The film or sheet or thin preform of the synthetic resin composition obtained in step (C) above is superimposed on the intermediate layer at a temperature of at least 100°C, which is above the solidification temperature of the base plastic and above the melting point. (E) a step of pressing the fusion layer of the synthetic resin composition while maintaining the temperature range, and then cooling the whole to form a sliding surface layer of the synthetic resin composition; ), (B
), (C), (D) and (E). A method for manufacturing a sliding member coated with a synthetic resin.