JP2021137963A - Slide member and method for producing slide member - Google Patents

Abstract

To provide a slide member capable of enhancing adhesion of a slide layer containing polytetrafluoroethylene as a main component while suppressing deterioration of quality.SOLUTION: The slide member according to one aspect of the present invention comprises a substrate layer, an intermediate layer and a slide layer in this order, wherein the main component of the intermediate layer is a heat-meltable fluororesin, and the main component of the slide layer is polytetrafluoroethylene.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sliding member and a method for manufacturing the sliding member.

Polytetrafluoroethylene (PTFE) has excellent mechanical strength, chemical resistance, slipperiness, heat resistance, wear resistance, weather resistance, nonflammability, etc., and is used to form the surface layer of sliding members. Be done.

However, in general, a film containing PTFE as a main component (PTFE film) is difficult to firmly adhere to other members. Therefore, when a layer containing PTFE is laminated on another layer, the surface of the other layer to be laminated is roughened to increase the laminated area, or a dispersion in which PTFE powder is dispersed in a dispersant is used. A method of applying to another layer and drying the dispersant is adopted.

Further, today, as a method of increasing the adhesion between the PTFE film and the other layer, a method of plasma-treating the laminated surface of the PTFE film with the other layer is also adopted (see Japanese Patent Application Laid-Open No. 2015-189934).

JP 2015-189934

However, when the surface of the other layer is roughened, equipment for roughening is required, which increases the manufacturing cost. Further, according to this method, the smoothness of the laminated surface is lowered, so that the usage is limited.

Further, when a dispersion containing PTFE powder is used, the manufacturing cost is high because special equipment is required, and the manufacturing efficiency may be lowered due to clogging of the powder or the like.

Further, when the laminated surface of the PTFE film is plasma-treated as described in the above publication, the manufacturing cost is high because special equipment is required, and the PTFE film is modified due to the modification of the laminated surface of the PTFE film. Quality may deteriorate.

The present invention has been made based on such circumstances, and manufactures a sliding member and a sliding member capable of increasing the adhesion of a sliding layer containing PTFE as a main component while suppressing deterioration of quality. The challenge is to provide a method.

The sliding member according to one aspect of the present invention made to solve the above problems includes a base material layer, an intermediate layer and a sliding layer in this order, and the main component of the intermediate layer is a heat-meltable fluororesin. Yes, the main component of the sliding layer is polytetrafluoroethylene.

The method for manufacturing a sliding member according to one aspect of the present invention, which has been made to solve the above problems, includes a step of laminating an intermediate layer and a sliding layer on one surface of a base material layer in this order, and the laminating. The step of heating the laminated body laminated in the step is provided, and the main component of the intermediate layer is a heat-meltable fluororesin, and the main component of the sliding layer is polytetrafluoroethylene. The laminate is heated above the melting point of polytetrafluoroethylene.

The sliding member and the method for manufacturing the sliding member according to the embodiment of the present invention can enhance the adhesion of the sliding layer containing PTFE as a main component while suppressing the deterioration of quality.

It is a schematic cross-sectional view which shows the sliding member which concerns on one Embodiment of this invention. It is a flow chart which shows the manufacturing method of the sliding member which concerns on one Embodiment of this invention.

[Explanation of Embodiments of the Present Invention]
First, embodiments of the present invention will be listed and described.

The sliding member according to one aspect of the present invention includes a base material layer, an intermediate layer, and a sliding layer in this order, and the main component of the intermediate layer is a heat-meltable fluororesin, and the main component of the sliding layer is. Is polytetrafluoroethylene.

As a result of diligent studies by the present inventors, even when the main component of the sliding layer is PTFE, the sliding layer is laminated on the base material layer via an intermediate layer containing a heat-meltable fluororesin as a main component. It was found that the sliding layer and the base material layer can be firmly adhered to each other. Since the sliding member enhances the adhesion between the sliding layer and the base material layer by interposing the intermediate layer, it is unlikely that the quality will be deteriorated due to the adhesion of the sliding layer. Therefore, the sliding member can enhance the adhesion of the sliding layer containing PTFE as a main component while suppressing the deterioration of quality.

The heat-meltable fluororesin is preferably a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) or a tetrafluoroethylene-hexafluoropropylene copolymer (FEP). As described above, when the heat-meltable fluororesin is PFA or FEP, the adhesion between the sliding layer and the base material layer can be easily and surely increased.

The main component of the base material layer is preferably a liquid crystal polymer. As described above, when the main component of the base material layer is the liquid crystal polymer, the adhesion between the sliding layer and the base material layer can be easily and surely increased.

The average thickness of the intermediate layer is preferably 10 μm or more and 200 μm or less. As described above, when the average thickness of the intermediate layer is within the above range, the adhesion between the sliding layer and the base material layer can be easily and surely increased.

Further, the method for manufacturing a sliding member according to another aspect of the present invention includes a step of laminating an intermediate layer and a sliding layer on one surface of a base material layer in this order, and a laminating step. A step of heating the laminate is provided, the main component of the intermediate layer is a heat-meltable fluororesin, the main component of the sliding layer is polytetrafluoroethylene, and the laminate is poly of the heating step. Heat above the melting point of tetrafluoroethylene.

In the method for manufacturing the sliding member, in the heating step, the laminated body in which the base material layer, the intermediate layer and the sliding layer are laminated in this order is heated to a temperature equal to or higher than the melting point of PTFE, so that the sliding layer and the base material are heated. The layers can be firmly adhered. Since the method for manufacturing the sliding member enhances the adhesion between the sliding layer and the base material layer by interposing the intermediate layer, it is unlikely that the quality is deteriorated due to the adhesion of the sliding layer. .. Therefore, the method for manufacturing the sliding member can enhance the adhesion between the sliding layer and the base material layer while suppressing the deterioration of quality.

In the present invention, the "main component" means a component having the largest content ratio in terms of mass, for example, a component having a content ratio of 50% by mass or more. The "average thickness" means the average value of the thickness at any 10 points. The "melting point" means the melting point peak temperature measured by a differential scanning calorimetry (DSC) in accordance with JIS-K7121: 2012 "Method for measuring transition temperature of plastics".

[Details of Embodiments of the present invention]
Hereinafter, the sliding member and the method for manufacturing the sliding member according to each embodiment of the present invention will be described in detail with reference to the drawings.

<Sliding member>
The sliding member of FIG. 1 includes a base material layer 1, an intermediate layer 2, and a sliding layer 3 in this order. The main component of the intermediate layer 2 is a heat-meltable fluororesin. The main component of the sliding layer 3 is PTFE.

As a result of diligent studies by the present inventors, even when the main component of the sliding layer 3 is PTFE, the sliding layer 3 is formed into the base material layer 1 via the intermediate layer 2 containing the heat-meltable fluororesin as the main component. It was found that the sliding layer 3 and the base material layer 1 can be firmly adhered to each other by laminating. The sliding member enhances the adhesion between the sliding layer 3 and the base material layer 1 by interposing the intermediate layer 2, and roughens the facing surfaces of the sliding layer 3 and the base material layer 1 and slides. Since the moving layer 3 does not need to be modified, it is unlikely that the quality will be deteriorated due to the adhesion of the sliding layer 3. Therefore, the sliding member can increase the adhesion of the sliding layer 3 containing PTFE as a main component while suppressing the deterioration of quality. Further, since the sliding member does not require equipment for roughening the facing surfaces of the sliding layer 3 and the base material layer 1 and modifying the sliding layer 3, the manufacturing cost can be suppressed.

The sliding member is used as a member such as a fixing roller or a bearing. The base material layer 1, the intermediate layer 2 and the sliding layer 3 are directly laminated. In the sliding member, the base material layer 1, the intermediate layer 2 and the sliding layer 3 are firmly adhered to each other, and specifically, the interface is broken at each interface of the base material layer 1, the intermediate layer 2 and the sliding layer 3. It is in close contact to the extent that it does not cause. The sliding layer 3 constitutes the outermost layer of the sliding member. That is, the sliding member has the sliding layer 3, the intermediate layer 2, and the base material layer 1 in this order from the outermost surface side. The sliding member may be further provided with another layer on the back surface side of the base material layer 1 (the side opposite to the side where the intermediate layer 2 is laminated). Further, although FIG. 1 shows a flat sheet-like structure, the shape of the sliding member is not particularly limited, and is a shape having a curved surface such as a cylindrical shape or an arch shape. It may have a shape other than a sheet shape.

(Sliding layer)
The sliding layer 3 contains PTFE as a main component as described above. This PTFE is preferably crosslinked, for example, by irradiation with ionizing radiation. Since the sliding layer 3 is crosslinked with PTFE, the wear resistance can be improved.

It is preferable that the laminated surface of the sliding layer 3 with the intermediate layer 2 is not modified. By disposing the intermediate layer 2 between the sliding layer 3 and the base material layer 1, the sliding member is a surface of the sliding layer 3 on the base material layer 1 side (a surface laminated with the intermediate layer 2). The adhesion between the sliding layer 3 and the base material layer 1 can be sufficiently enhanced even when the above is not modified. Further, in the sliding member, since the sliding layer 3 is not modified, it is possible to prevent the quality of the sliding layer 3 from being deteriorated due to the modification.

It is preferable that the laminated surface of the sliding layer 3 with the intermediate layer 2 is not roughened. By disposing the intermediate layer 2 between the sliding layer 3 and the base material layer 1, the sliding member is a surface of the sliding layer 3 on the base material layer 1 side (a surface laminated with the intermediate layer 2). The adhesion between the sliding layer 3 and the base material layer 1 can be sufficiently enhanced even when the surface is not roughened. Further, by not roughening the laminated surface of the sliding layer 3 with the intermediate layer 2, it is possible to prevent the use of the sliding member from being limited due to the roughening. When the laminated surface of the sliding layer 3 with the intermediate layer 2 is not roughened, the upper limit of the arithmetic mean roughness Ra of the laminated surface of the sliding layer 3 with the intermediate layer 2 is preferably 0.50 μm, for example, 0. .10 μm is more preferred, and 0.05 μm is even more preferred. Further, the lower limit of the arithmetic mean roughness Ra of the laminated surface of the sliding layer 3 with the intermediate layer 2 can be set to 0 μm. The "arithmetic mean roughness Ra" means a value measured with a cutoff value (λc) of 2.5 mm and an evaluation length (l) of 8 mm according to JIS-B0601: 2001.

PTFE may contain polymerization units derived from other copolymerizable monomers as long as the effects of the present invention are not impaired, for example, perfluoro (alkyl vinyl ether), hexafluoropropylene, (perfluoroalkyl) ethylene, and the like. It may contain a polymerization unit such as chlorotrifluoroethylene. The upper limit of the content ratio of the polymerization unit derived from the other copolymerizable monomer can be, for example, 3 mol%.

As the lower limit of the content ratio of PTFE in the sliding layer 3, 60% by mass is preferable, 85% by mass is more preferable, and 98% by mass is further preferable. Further, the content ratio is particularly preferably 100% by mass. If the content ratio does not reach the lower limit, the properties such as wear resistance and heat resistance may not be sufficiently high.

The sliding layer 3 may contain other optional components. Examples of this optional component include solid lubricants, reinforcing materials and the like. Since the sliding layer 3 contains a solid lubricant, a reinforcing material, etc., the slipperiness can be further improved. Examples of the solid lubricant include molybdenum disulfide and the like. Examples of the reinforcing material include glass fibers (glass fibers), glass fillers such as spherical glass, and inorganic fillers such as carbon fibers, calcium carbonate, talc, silica, alumina, and aluminum hydroxide.

The lower limit of the melting point (crystal melting point) of PTFE is preferably 320 ° C. If the melting point is smaller than the lower limit, the wear resistance may be insufficient due to a decrease in heat resistance and the like. On the other hand, as the upper limit of the melting point, for example, 340 ° C. is preferable, and 335 ° C. is more preferable. Moreover, as a typical melting point of this PTFE, for example, 327 ° C. can be mentioned.

The lower limit of the average thickness of the sliding layer 3 is preferably 50 μm, more preferably 100 μm. On the other hand, the upper limit of the average thickness of the sliding layer 3 is preferably 1000 μm, more preferably 700 μm, and even more preferably 500 μm. If the average thickness does not reach the lower limit, the durability of the sliding layer 3 may be insufficient. On the contrary, if the average thickness exceeds the upper limit, the flexibility of the sliding layer 3 may decrease, and the intended use may be limited.

(Middle class)
The intermediate layer 2 is an adhesive layer that adheres the base material layer 1 and the sliding layer 3. Since the sliding layer 3 contains PTFE as a main component, it is difficult to directly adhere to the base material layer 1. On the other hand, according to the findings of the present inventors, surprisingly, by interposing the intermediate layer 2 as an adhesive layer, the sliding layer 3 can be firmly adhered to the base material layer 1.

The intermediate layer 2 may be partially disposed between the base material layer 1 and the sliding layer 3, but from the viewpoint of enhancing the adhesion between the base material layer 1 and the sliding layer 3, the base material layer 1 and the sliding layer 3 It is preferably arranged in the entire region between the sliding layers 3.

As described above, the intermediate layer 2 contains a heat-meltable fluororesin as a main component. Examples of the heat-meltable fluororesin include PFA and FEP. Since the heat-meltable fluororesin is PFA or FEP, the sliding member can easily and surely enhance the adhesion between the sliding layer 3 and the base material layer 1 by the intermediate layer 2. The heat-meltable fluororesin may contain a polymerization unit derived from another copolymerizable monomer as long as the effect of the present invention is not impaired. Further, the intermediate layer 2 may contain other optional components as long as the effects of the present invention are not impaired.

As the lower limit of the content ratio of the heat-meltable fluororesin in the intermediate layer 2, 60% by mass is preferable, 85% by mass is more preferable, and 98% by mass is further preferable. Further, the content ratio is particularly preferably 100% by mass. If the content ratio does not reach the lower limit, the adhesion between the base material layer 1 and the sliding layer 3 may not be sufficiently increased.

The heat-meltable fluororesin in the intermediate layer 2 may not be crosslinked or may be crosslinked. Further, the melting point of the heat-meltable fluororesin is lower than the melting point of the PTFE. The melting point of PFA is, for example, 304 ° C. or higher and 310 ° C. or lower. The melting point of FEP is, for example, 270 ° C.

As the lower limit of the average thickness of the intermediate layer 2, 10 μm is preferable, and 25 μm is more preferable. On the other hand, the upper limit of the average thickness of the intermediate layer 2 is preferably 200 μm, more preferably 150 μm. If the average thickness does not reach the lower limit, the adhesive force between the sliding layer 3 and the base material layer 1 may not be sufficiently increased. On the contrary, when the average thickness exceeds the upper limit, the thickness of the intermediate layer 2 becomes unnecessarily large, which may increase the manufacturing cost. On the other hand, when the average thickness is within the above range, the heat-meltable fluororesin appropriately flows when the base material layer 1, the intermediate layer 2 and the sliding layer 3 are adhered by heating. Then, the gap between the adhesive surface between the base material layer 1 and the intermediate layer 2 and the adhesive surface between the intermediate layer 2 and the sliding layer 3 is filled. As a result, the base material layer 1 and the intermediate layer 2 and the intermediate layer 2 and the sliding layer 3 can be completely adhered to each other, and the adhesion between the base material layer 1, the intermediate layer 2 and the sliding layer 3 can be improved. Can be raised enough.

It is preferable that both sides of the intermediate layer 2 are not modified. Further, it is preferable that both surfaces of the intermediate layer 2 are not roughened. When both sides of the intermediate layer 2 are not roughened, the upper limit of the arithmetic average roughness Ra of both sides of the intermediate layer 2 is, for example, preferably 0.50 μm, more preferably 0.10 μm, and even more preferably 0.05 μm. .. Further, the lower limit of the arithmetic mean roughness Ra of the intermediate layer 2 can be set to 0 μm.

(Base layer)
The base material layer 1 contains, for example, a metal or a super engineering plastic as a main component. When the main component of the base material layer 1 is the above metal, the base material layer 1 may be in the form of a foil or a plate. When the main component of the base material layer 1 is a super engineering plastic, the base material layer 1 is, for example, a flexible film. Note that the "super engineering plastics", long-term heat resistance is 100 ° C. or higher, the thermal deformation temperature of 0.99 ° C. or higher, a tensile strength of 5 kgf · ^{mm -2} or more and flexural synthesis modulus of 245kgf · ^{mm -2} or more Refers to resin. However, synthetic resin containing fluororesin as the main component is not included.

Examples of the metal include aluminum, aluminum alloys, copper, copper alloys, iron alloys such as iron and stainless steel, and nickel. Examples of the super engineering plastic include polyimide (PI), polyamideimide (PAI), polyetherimide (PEI), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyallylate (PAR), and liquid crystal polymer (LCP). ), Polysulfone (PSF), polyethersulfone (PES) and the like, and one type can be used alone or two or more types can be used in combination. Among them, a liquid crystal polymer is preferable as the main component of the base material layer 1. Since the main component of the base material layer 1 is a liquid crystal polymer, the adhesion between the sliding layer 3 and the base material layer 1 can be easily and surely increased by interposing the intermediate layer 2.

The average thickness of the base material layer 1 can be appropriately set according to the intended use of the sliding member, but the lower limit thereof is, for example, preferably 10 μm, more preferably 100 μm. If the average thickness is smaller than the lower limit, the strength of the base material layer 1 may be insufficient. On the other hand, the upper limit of the average thickness of the base material layer 1 can be, for example, 10 cm.

It is preferable that the laminated surface of the base material layer 1 with the intermediate layer 2 is not roughened. In the sliding member, the intermediate layer 2 is arranged between the sliding layer 3 and the base material layer 1, so that the sliding layer 3 and the base material layer 1 can be arranged even when the base material layer 1 is not roughened. Adhesion force can be sufficiently enhanced. Further, the sliding member does not roughen the surface of the base material layer 1 on the sliding layer 3 side (the surface laminated with the intermediate layer 2), thereby preventing the use of the sliding member from being limited by the roughening. can do. When the laminated surface of the base material layer 1 with the intermediate layer 2 is not roughened, the upper limit of the arithmetic mean roughness Ra of the laminated surface of the base material layer 1 with the intermediate layer 2 is preferably 0.50 μm, for example, 0. .10 μm is more preferred, and 0.05 μm is even more preferred. Further, the lower limit of the arithmetic mean roughness Ra of the laminated surface of the base material layer 1 with the intermediate layer 2 can be set to 0 μm.

In the sliding member, it is preferable that the base material layer 1 causes material destruction when the sliding layer 3 is subjected to a 180 ° peeling test. The sliding member has an interface between the intermediate layer 2 and the base material layer 1 and an intermediate layer 2 by increasing the adhesion between the intermediate layer 2 and the base material layer 1, and the intermediate layer 2 and the sliding layer 3. It is possible to prevent peeling at the interface between the sliding layer 3 and the sliding layer 3.

<Manufacturing method of sliding member>
Subsequently, a method of manufacturing the sliding member of FIG. 1 will be described with reference to FIG. The method for manufacturing the sliding member includes a step of laminating the intermediate layer 2 and the sliding layer 3 on one surface of the base material layer 1 in this order (lamination step), and a laminated body laminated in the laminating step. It is provided with a heating step (heating step). The main component of the intermediate layer 2 is a heat-meltable fluororesin, and the main component of the sliding layer 3 is PTFE. In the method for manufacturing the sliding member, the laminate is heated to a temperature equal to or higher than the melting point of PTFE in the heating step.

According to the findings of the present inventors, even when the main component of the sliding layer 3 is PTFE, a laminated body in which the base material layer 1, the intermediate layer 2 and the sliding layer 3 are laminated in this order is PTFE. By heating above the melting point of, the sliding layer 3 and the base material layer 1 can be firmly adhered to each other. Since the method for manufacturing the sliding member enhances the adhesion between the sliding layer 3 and the base material layer 1 by interposing the intermediate layer 2, the adhesion of the sliding layer 3 causes a deterioration in quality. hard. Therefore, the method for manufacturing the sliding member can easily and surely increase the adhesion between the sliding layer 3 and the base material layer 1 while suppressing the deterioration of quality. Further, since the method for manufacturing the sliding member does not require roughening the facing surfaces of the sliding layer 3 and the base material layer 1 or modifying the sliding layer 3, the manufacturing cost can be suppressed. can.

(Laminating process)
In the laminating step, the base material layer 1, the intermediate layer 2, and the sliding layer 3 are directly laminated in this order. More specifically, in the laminating step, a base material layer forming film or a base material layer forming plate material for forming the base material layer 1 of the sliding member of FIG. 1 (hereinafter, a base material layer forming film and a base). The lumber layer forming plates are collectively referred to as a base material layer forming film), an intermediate layer forming film for forming the intermediate layer 2, and a sliding layer forming film for forming the sliding layer 3 in this order. Laminate directly with. The components and average thickness of the base material layer forming film are the same as those of the base material layer 1 in FIG. The components and average thickness of the intermediate layer forming film are the same as those of the intermediate layer 2 in FIG. The components and average thickness of the sliding layer forming film are the same as those of the sliding layer 3 in FIG. In the laminating step, another layer or the like may be further laminated on the surface of the base material layer 1 opposite to the laminating surface with the intermediate layer 2.

The laminated surface of the sliding layer forming film with the intermediate layer forming film and the laminated surface of the base material layer forming film with the intermediate layer forming film, which are laminated in the laminating step, must not be modified. preferable. That is, it is preferable that the method for manufacturing the sliding member does not include a step of modifying the surface of the sliding layer forming film and the surface of the base material layer forming film.

Further, the laminated surface of the sliding layer forming film laminated in the laminating step with the intermediate layer forming film and the laminated surface of the base material layer forming film with the intermediate layer forming film are roughened. It is preferable that there is no such thing. That is, it is preferable that the method for manufacturing the sliding member does not include a step of roughening the surface of the sliding layer forming film and the surface of the base material layer forming film.

(Heating process)
In the heating step, the laminated body of the base material layer 1, the intermediate layer 2 and the sliding layer 3 laminated in the above-mentioned laminating step is heated to a temperature equal to or higher than the melting point of PTFE. In the heating step, the laminate may be heated to a temperature equal to or higher than the melting point of PTFE and at the same time the laminate may be pressed. When the laminated body is pressed, the surface of the laminated body can be subjected to surface processing such as embossing by imparting a desired shape to the surface of the press die. When the PTFE contained in the sliding layer 3 manufactured by the method for manufacturing the sliding member is crosslinked, it is preferable that the PTFE is crosslinked before the heating step. Further, when the PFA and / or FEP contained in the intermediate layer 2 manufactured by the method for manufacturing the sliding member is crosslinked, it is preferable that the PFA and / or FEP is crosslinked before the heating step.

In the heating step, for example, the laminate is heated in a heating furnace. As the lower limit of the heating atmosphere temperature in the heating step, a temperature 5 ° C. higher than the melting point of PTFE is preferable, and a temperature 10 ° C. higher than the melting point of PTFE is more preferable. Specifically, when the melting point of PTFE is 327 ° C., the lower limit of the heating atmosphere temperature in the heating step is preferably 332 ° C., more preferably 337 ° C. The method for manufacturing the sliding member is that the PTFE is partially rubberized on the adhesive surface of the sliding layer 3 and the intermediate layer 2 and the heat-meltable fluororesin is partially melted and decomposed by the heating step. Therefore, it is considered that the adhesive force between the sliding layer 3 and the intermediate layer 2 is enhanced due to the branched molecular structure of the heat-meltable fluororesin. Therefore, if the heating atmosphere temperature does not reach the lower limit, the PTFE cannot be sufficiently softened, and the adhesive strength between the sliding layer 3 and the intermediate layer 2 may be insufficient. As the upper limit of the heating atmosphere temperature in the heating step, for example, a temperature 50 ° C. higher than the melting point of PTFE is preferable, and a temperature 40 ° C. higher than the melting point of PTFE is more preferable. Specifically, when the melting point of PTFE is 327 ° C., the upper limit of the heating atmosphere temperature in the heating step is preferably 372 ° C., more preferably 376 ° C. If the heating atmosphere temperature exceeds the upper limit, the heating temperature in the heating step may become unnecessarily high, which may increase the manufacturing cost or the heat-meltable fluororesin may be excessively melted and decomposed.

The lower limit of the heating time in the heating step is preferably 1 minute. On the other hand, the upper limit of the heating time in the heating step is preferably 90 minutes, more preferably 70 minutes. If the heating time does not reach the lower limit, the PTFE may not be heated at a sufficient heating temperature. On the contrary, if the heating time exceeds the upper limit, the heating time in the heating step may become unnecessarily long, which may increase the manufacturing cost or the heat-meltable fluororesin may be excessively melted and decomposed. Further, when the heating time exceeds the upper limit, hydrofluoric acid is likely to be generated by the decomposition of the heat-meltable fluororesin. Therefore, for example, when the main component of the base material layer forming film is a metal, the metal may be corroded by this hydrofluoric acid, and the mechanical strength of the base material layer 1 may decrease.

The heating step may be performed in a pressurized atmosphere or a reduced pressure atmosphere. In the heating step, the adhesion between the intermediate layer 2 and the base material layer 1 and the intermediate layer 2 and the sliding layer 3 due to the expansion of bubbles such as hydrogen fluoride gas generated by the decomposition of the heat-meltable fluororesin May decrease. In this regard, the intermediate layer 2, the base material layer 1, and the intermediate layer 2 and the base material layer 1 are intermediate by compressing the bubbles by performing the heating step in a pressurized atmosphere or by removing air by performing the heating step in a reduced pressure atmosphere. The adhesion between the layer 2 and the sliding layer 3 can be increased more reliably.

The heating step is also preferably performed in a vacuum atmosphere or a nitrogen atmosphere. By performing the heating step in a vacuum atmosphere or a nitrogen atmosphere, it is possible to prevent oxidation of the metal when the main component of the film for forming the base material layer is a metal, and the mechanical strength of the base material layer 1 can be prevented. Can be prevented from decreasing.

(Other processes)
The method for manufacturing the sliding member may include a step (cleaning step) of cleaning the laminated surface of the base material layer forming film with the intermediate layer forming film before the laminating step. The method for manufacturing the sliding member includes the cleaning step to remove foreign substances, stains, and the like on the laminated surface of the base material layer forming film with the intermediate layer forming film, and the base material layer 1 and the intermediate layer. The adhesion of 2 can be easily and surely increased. Further, in the method of manufacturing the sliding member, before the laminating step, the laminated surface of the intermediate layer forming film with the base material layer forming film and / or the sliding layer forming film, or the sliding layer forming. A step of cleaning the laminated surface of the film for forming the intermediate layer with the film for forming the intermediate layer may be provided.

[Other Embodiments]
It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is not limited to the configuration of the above embodiment, but is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. NS.

For example, the intermediate layer may be a multilayer body having two or more layers.

In the above embodiment, the structure in which the base material layer is plate-shaped, foil-shaped, or film-shaped has been described, but the base material layer may have a three-dimensional shape other than plate-shaped, foil-shaped, or film-shaped.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

[No. 1 and No. 2]
A 1200 μm-thick base film layer-forming film made of aluminum and a 50 μm-thick intermediate layer-forming film mainly composed of PFA (melting point 304 to 310 ° C.) (“Neoflon (registered trademark) PFA” manufactured by Daikin Industries, Ltd. ”) And a film for forming a sliding layer with a thickness of 200 μm (“Balflon (registered trademark)” manufactured by Nippon Valker Industries, Ltd.) containing uncrosslinked PTFE (melting point 327 ° C.) as a main component were laminated in this order. (Laminating process). The laminated surfaces of the base material layer forming film, the intermediate layer forming film, and the sliding layer forming film are not roughened and are not surface-treated. The arithmetic mean roughness Ra of the laminated surface of the base material layer forming film with the intermediate layer forming film is 0.4 μm, the arithmetic mean roughness Ra of both sides of the intermediate layer forming film is 0.4 μm, and the sliding layer is formed. The arithmetic mean roughness Ra of the laminated surface of the film with the film for forming the intermediate layer is 0.4 μm. A plate made of stainless steel having a thickness of 120 μm is placed on the surface of the sliding layer forming film of the laminated body laminated in this laminating step, sandwiched between crimping jigs, and housed in a heating furnace to heat in Table 1. Heated at temperature and heating time (heating step). Then, it was taken out from a heating furnace, cooled to room temperature (25 ° C.), and then a plate material and a crimping jig were removed to obtain a sliding member.

[No. 3 to No. 7]
No. No. 1 except that the film for forming the base material layer shown in Table 1 was used instead of the film for forming the base material layer of No. 1. No. 1 in the same manner as in 1. 3 to No. 7 sliding members were manufactured.

[No. 8 and No. 9]
Except that the heating temperature and heating time in the above heating step are as shown in Table 1, No. A sliding member was manufactured in the same manner as in 1.

[No. 10]
In place of the film for forming the intermediate layer, no. .. A sliding member was manufactured in the same manner as in 1.

<Adhesion>
No. 1 in which a strip-shaped intermediate layer having a width of 5 mm and a sliding layer were laminated in this order on the surface of the base material layer. 1-No. Ten test pieces were prepared, a 180 ° peeling test of the sliding layer and the intermediate layer was performed at room temperature (25 ° C.), and the adhesion was evaluated according to the following criteria. The evaluation results are shown in Table 2.
A: The peel strength could not be measured due to the destruction of the sliding layer.
B: Material destruction of the base material layer occurred under a load of 1.0 kgf / 5 mm or more.
C: Material destruction of the base material occurred at a load of less than 1.0 kgf / 5 mm.
D: Peeled at the interface between the sliding layer and the intermediate layer.

<Evaluation result>
As shown in Tables 1 and 2, the base material layer, the intermediate layer containing the heat-meltable fluororesin as the main component, and the sliding layer containing PTFE as the main component are laminated in this order, and in the above heating step. No. obtained by heating above the melting point of PTFE. 1-No. The sliding member of No. 7 has excellent adhesion.

As described above, the sliding member of the present invention can increase the adhesion of the sliding layer containing PTFE as a main component while suppressing the deterioration of quality. Therefore, the sliding member used for the fixing roller of the image forming apparatus. Suitable as.

1 Base material layer 2 Intermediate layer 3 Sliding layer

Claims (5)

A base material layer, an intermediate layer and a sliding layer are provided in this order.
The main component of the intermediate layer is a heat-meltable fluororesin.
A sliding member in which the main component of the sliding layer is polytetrafluoroethylene. The sliding member according to claim 1, wherein the heat-meltable fluororesin is a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer or a tetrafluoroethylene-hexafluoropropylene copolymer. The sliding member according to claim 1 or 2, wherein the main component of the base material layer is a liquid crystal polymer. The sliding member according to claim 1, claim 2 or claim 3, wherein the average thickness of the intermediate layer is 10 μm or more and 200 μm or less. A process of laminating an intermediate layer and a sliding layer on one surface of the base material layer in this order,
It is provided with a step of heating the laminated body laminated in the above-mentioned laminating step.
The main component of the intermediate layer is a heat-meltable fluororesin.
The main component of the sliding layer is polytetrafluoroethylene,
A method for manufacturing a sliding member that heats the laminate to a temperature equal to or higher than the melting point of polytetrafluoroethylene in the heating step.

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