JP2008038038A - Sliding member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sliding member such as bearing, bed slide, etc., having low friction properties applicable to parts requiring low friction properties in a wide field. <P>SOLUTION: Th planar sliding member 1 comprises a quadratic prism base 2 composed of a laminate of a fiber fabric reinforced thermosetting synthetic resin, a surface layer material 4 integrally bonded to one surface 3 of the base 2, a plurality of cylindrical recessed parts 6 which are opened to the base 2 and the surface layer material 4 at the surface 5 of the surface layer material 4, extended to a part of the base 2 and formed and a solid lubricant 7 filled and retained in the recessed parts 6. The solid lubricant 7 comprises 5-15 wt.% of carbon black, 10-20 wt.% of hydrocarbon-based wax, 1-5 wt.% of aromatic polyamide resin powder, 10-20 wt.% of a hydrocarbon oil and the rest of a normal-temperature curing epoxy resin. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sliding member such as a bearing and a sliding plate having low friction.

Japanese Examined Patent Publication No. 39-14852 Japanese Patent Publication No.58-35468

  Conventionally, in order to obtain a phenol resin sliding member containing a cotton cloth base material, a solid lubricant powder such as graphite, molybdenum disulfide or ethylene tetrafluoride resin (hereinafter abbreviated as “PTFE”) is dispersed in a phenol resin varnish. Immerse the cotton cloth base material into the object, pull it up, heat it appropriately and dissipate the solvent to obtain a prepreg in which these solid lubricants are adhered and impregnated on the base material, and use this as a molding material as a laminated sliding member, etc. The method is used.

  However, in order to maintain workability when forming the prepreg by dipping and pulling up the cotton fabric base material, it is necessary to keep the mixing ratio of the solid lubricant relatively low, and as a result, the solid lubricant obtained by the above-mentioned known method In the sliding member, the coefficient of friction cannot be lowered so much and sufficient wear resistance cannot always be obtained.

  In addition, even if the mixing ratio of the solid lubricant can be increased, the mixture of the resin and the solid lubricant is not sufficiently filled in the fiber structure gap of the fiber base material by simple dipping, and the mixture is not the base material. If the prepreg is used for lamination molding, the resulting molded product may cause delamination, and as a result, the mechanical strength of the sliding member may be significantly reduced. .

  In order to solve such a problem, a reinforcing base material is impregnated with a synthetic resin varnish in advance, and then a varnish containing a solid lubricant is applied to the varnish-impregnated base material, or an aqueous dispersion of a solid lubricant is applied. There is a method in which a solid lubricant is adhered only to almost the surface of a base material (described in Patent Document 1). However, even in the method disclosed in Patent Document 1, it is difficult to say that the sliding member has low friction and wear resistance.

  In addition to the above-described sliding member, PTFE fibers and other fibers such as cotton fibers and glass fibers are formed on the surface (sliding surface) of a base material in which a plurality of prepregs impregnated with a resin varnish are woven into a woven cloth such as cotton cloth. There has been proposed a sliding member obtained by integrally laminating these unwoven fabrics (Patent Document 2). This Patent Document 2 discloses a resin processing comprising PTFE fibers and other fibers other than PTFE fibers, and impregnated with 25 to 40% by weight of a thermosetting synthetic resin in a woven fabric in which the PTFE fibers occupy 60 to 85% on the surface. A surface layer material made of PTFE unwoven fabric is disclosed. Since this surface layer material is used by being joined and integrated with the backing material, it is necessary to expose fibers other than PTFE fibers on the back surface that becomes the joining surface with the backing material, The exposed ratio of PTFE fibers exhibiting low friction cannot be 100% on the surface. Accordingly, fibers that do not contribute to low friction are exposed on the sliding surface, and it is difficult to say that the sliding member exhibits low friction.

  The sliding members disclosed in Patent Document 1 and Patent Document 2 are sufficiently usable in specific applications, but are particularly required to have low friction properties, such as buildings, bridges, and elevated roads in the field of construction and civil engineering. It is extremely difficult to apply to a sliding seismic isolation device that is installed in combination with an elastic bearing that supports and reduces the seismic force applied to the building.

  The present invention has been made in view of the above-described points, and the object of the present invention is to provide a bearing and a slide having a low friction property that can be applied to a portion where low friction property is required in a wide range of fields. The object is to provide a sliding member such as a plate.

  The sliding member of the present invention includes a substrate made of a laminate of a fiber woven cloth reinforced thermosetting synthetic resin, a surface layer material integrally bonded to one surface of the substrate, and a surface of the surface material on the substrate and the surface material. And at least one recess or groove formed to extend to a part of the substrate, and a solid lubricant filled and held in the recess or groove. The solid lubricant is 5 to 15% by weight of carbon black. And 10 to 20% by weight of a hydrocarbon wax, 1 to 5% by weight of an aromatic polyamide resin powder, 10 to 20% by weight of a hydrocarbon oil, and the balance of a normal temperature curable epoxy resin.

  According to the sliding member of the present invention, the surface layer material excellent in slidability and the solid lubricant filled and held in the recesses or grooves opened on the surface of the surface layer material are exposed on the sliding surface. Since the hydrocarbon oil absorbed and retained in the hydrocarbon wax in the lubricant is supplied to the sliding surface by frictional heat generated by sliding with the counterpart material, the counterpart material is a surface layer material with excellent slidability and Low friction is exhibited by shifting to sliding through the hydrocarbon oil supplied to the surface of the surface material.

  In the sliding member of the present invention, the surface layer material is preferably a polyamide resin sheet, more preferably a 12 nylon sheet, and further preferably a 12 nylon sheet containing graphite containing 3 to 7% by weight of graphite. One surface may be integrally joined to one surface of the substrate.

  A polyamide resin sheet, particularly a 12 nylon sheet, is suitable for use as a surface layer material because it itself has a low friction property. Furthermore, a 12 nylon sheet containing 3 to 7% by weight of graphite has a low friction property. Therefore, it is preferable as a surface layer material because of its improved wear resistance.

  Further, the surface layer material is composed of at least one woven fabric sheet composed of a woven fabric made of organic fibers and a thermosetting synthetic resin containing PTFE impregnated and coated on the surface of the woven fabric and the fiber structure gap. May be. In this woven fabric sheet, since PTFE contained in the thermosetting synthetic resin is mixed, the low friction property of PTFE is exhibited on the surface of the sheet.

  The organic fiber is preferably selected from cotton fiber, aramid fiber, polyester fiber, and a mixed fiber of cotton fiber and polyester fiber. Therefore, in the woven fabric sheet, as the woven fabric made of organic fiber, One selected from cotton woven fabrics, aramid fiber woven fabrics, polyester fiber woven fabrics, and blended woven fabrics of cotton fibers and polyester fibers is preferable.

  Further, the surface layer material includes a composite woven fabric in which a woven fabric of PTFE fibers and a woven fabric of organic fibers are overlapped and integrated by stitching with a fluorine resin yarn, and specifically, the composite woven fabric. You may consist of the composite woven fabric sheet | seat which consists of the thermosetting synthetic resin impregnated and applied to the cloth surface and the fiber structure space | interval. This composite woven fabric sheet is preferably integrally bonded to one surface of the substrate on the woven fabric side of the organic fiber.

  In this composite woven fabric sheet, the surface serving as the sliding surface is an exposed surface of the PTFE fiber woven fabric and the fluororesin yarn, so that the inherent low friction property of PTFE and fluororesin is exhibited.

  In this composite woven fabric, the woven fabric similar to the above may be used as the organic fiber woven fabric.

  The fluororesin yarn may be selected from any one of PTFE yarns and yarns made of ethylene tetrafluoride / hexafluoropropylene copolymer (hereinafter referred to as “FEP”). It is either a yarn or a spun yarn, and is preferably a yarn in the range of about 200 to 1,200 denier.

  In the solid lubricant that fills and holds in at least one recess or groove formed in the surface of the base material and the surface material at the surface of the surface material and extending to a part of the base material, the hydrocarbon wax generally has a carbon number. It may be selected from at least one of 24 or more paraffin waxes, olefin waxes having about 26 or more carbon atoms, alkylbenzenes having about 28 or more carbon atoms, and microcrystalline waxes.

  The aromatic polyamide resin powder in the solid lubricant is preferably a metaphenylene isophthalamide powder obtained by condensation polymerization of metaphenylenediamine and isophthalic acid chloride.

  The hydrocarbon oil in the solid lubricant is preferably a hydrocarbon mineral oil such as paraffinic oil or naphthenic oil or a hydrocarbon synthetic oil such as poly-α-olefin or polybutene.

  According to the present invention, the sliding surface is exposed to the surface layer material having low friction properties and the solid lubricant filled and held in the recesses or grooves opened on the surface of the surface layer material, and is filled and held in the recesses or grooves. As a result of the hydrocarbon oil contained in the solid lubricant being supplied to the sliding surface by sliding frictional heat, a sliding member is provided that exhibits the low friction of the surface material and the low friction of the solid lubricant. Is done.

  Next, the present invention and its embodiments will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  In FIG. 1, a flat sliding member 1 is integrally formed on a rectangular column base 2 made of a laminate of fiber woven cloth reinforced thermosetting synthetic resin and one surface 3 of the base 2 (see FIG. 5). The joined surface layer material 4, a plurality of cylindrical recesses 6 formed in the substrate 2 and the surface layer material 4 at the surface 5 of the surface layer material 4 and extending to a part of the substrate 2, and filling the recesses 6 And a held solid lubricant 7. The sliding member 1 may have a cylindrical shape as shown in FIG. 2, and the concave portion 6 is a single concave portion 6 composed of two long rectangular parallelepiped grooves as shown in FIG. Also good.

  In the manufacturing apparatus for the base body 2 of the flat sliding member 1 shown in FIG. 3, the reinforcing base material 9 made of a fiber woven fabric wound around an uncoiler 8 stores the thermosetting synthetic resin varnish 11 by the feed roller 10. It is sent to the container 12 and is passed through the thermosetting synthetic resin varnish 11 stored in the container 12 by the guide rollers 13 and 14 provided in the container 12, so that the surface of the reinforcing substrate 9 is thermoset. The synthetic resin varnish 11 is applied. Next, the reinforcing base material 9 coated with the thermosetting synthetic resin varnish 11 is sent to the compression rolls 16 and 17 by the feed roller 15, and the heat applied to the surface of the reinforcing base material 9 by the compression rolls 16 and 17. The curable synthetic resin varnish 11 is impregnated into the fiber structure gap. The reinforcing base 9 impregnated with the thermosetting synthetic resin varnish 11 is subjected to a resin reaction at the same time as the solvent is blown in the drying furnace 18. 19 is produced. The prepreg 19 thus obtained is cut into a desired size as shown in FIG.

  Examples of the fiber woven fabric used for the reinforcing base material 9 serving as the substrate 2 include cotton fabric (cotton fiber woven fabric), organic fiber woven fabric such as aramid fiber woven fabric, polyester fiber woven fabric, glass fiber fabric, and carbon fiber fabric. Inorganic fiber woven fabric is preferred. Also, as the thermosetting synthetic resin, phenol resin, epoxy resin, unsaturated polyester resin, etc. are suitable, and as the volatile solvent of these thermosetting synthetic resins, thermosetting using methanol, acetone, methyl ethyl ketone, etc. It is appropriately selected depending on the synthetic resin. The solid content of the thermosetting synthetic resin varnish formed by dissolving the thermosetting synthetic resin in a volatile solvent is approximately 30 to 65% by weight, and the viscosity of the resin varnish is approximately 800 to 5000 cP. 1000 to 4000 cP is preferred.

  As shown in FIG. 5, the first surface layer material 4 is a polyamide resin sheet 40, preferably a 12 nylon resin sheet, and more preferably a 12 nylon resin sheet containing graphite containing 3 to 7% by weight of graphite. This sheet is formed to a thickness of approximately 0.5 mm.

  As shown in FIG. 6, the second surface layer material 4 includes a woven fabric 41a made of organic fibers and a thermosetting synthetic resin 41b containing PTFE impregnated and coated on the surface of the woven fabric 41a and the gap between the fiber tissues. The woven fabric sheet 41 is formed.

  The woven fabric sheet 41 is manufactured by the same manufacturing method using a manufacturing apparatus similar to the manufacturing apparatus shown in FIG. That is, the woven fabric 41 a made of organic fibers wound around the uncoiler 8 is sent to the container 12 storing the mixed solution 21 of the PTFE powder and the thermosetting synthetic resin varnish by the feed roller 10, and is provided in the container 12. The mixed liquid 21 is applied to the surface of the woven fabric 41a by allowing the guide rollers 13 and 14 to pass through the mixed liquid 21 stored in the container 12. Next, the woven fabric 41a coated with the mixed solution 21 is fed to the compression rolls 16 and 17 by the feed roller 15, and the mixed solution 21 coated on the surface of the woven fabric 41a by the compression rolls 16 and 17 is transferred to the fiber structure gap. It is impregnated up to. Then, a solvent is blown in the drying furnace 18 to the woven fabric 41a impregnated with the mixed solution 21, and at the same time the reaction of the resin proceeds, whereby a moldable prepreg (woven fabric sheet 41) is produced.

  The PTFE powder contained in the thermosetting synthetic resin varnish that is impregnated and applied to the woven fabric 41a made of organic fibers forming the second surface layer material 4 is a powder for molding or solid lubrication. From the viewpoint of uniform dispersibility in the thermosetting synthetic resin varnish in mixing with the thermosetting synthetic resin varnish, a powder for solid lubrication is preferable, and the average particle size is approximately 1 to 50 μm, preferably 1 to 30 μm. is there. Specific examples of such PTFE include “Teflon (registered trademark) 7J (trade name)” and “TLP-10 (trade name)” manufactured by Mitsui DuPont Fluoro Chemical Co., Ltd. and “Fullon G163 (trade name) manufactured by Asahi Glass Co., Ltd. ) ”,“ Fullon L169J (trade name) ”,“ Polyflon M15 (trade name) ”and“ Lublon L5 (trade name) ”manufactured by Daikin Industries, Ltd.,“ KTL610, KTL350, KTL8N ”(all trade names) manufactured by Kitamura ) ".

  And the ratio of the woven fabric 41a which consists of the organic fiber which forms the 2nd surface layer material 4, thermosetting synthetic resin, and PTFE is 25-35 weight% of woven fabrics, 30-45 weight% of thermosetting synthetic resins, 30 to 45% by weight of PTFE is a preferred range. In this range, from the viewpoint of frictional wear characteristics as the surface layer material 4 (woven fabric sheet 41), the blending ratio of the woven fabric 41a and the thermosetting synthetic resin impregnated on the woven fabric 41a and PTFE is determined. . When the blending ratio of the thermosetting synthetic resin is less than 30% by weight, the bonding strength as the surface layer material 4 is not sufficient, and when it exceeds 45% by weight, the low friction property of PTFE may be impaired. Further, PTFE imparts low friction to the surface layer material 4, but if the blending ratio is less than 30% by weight, it is difficult to impart sufficient low friction to the surface layer material 4, and more than 45% by weight is blended. There is a possibility that the bonding property of the thermosetting synthetic resin is lowered, and as a result, peeling of the surface layer material 4 is caused.

  As shown in FIG. 7, the third surface layer material 4 is a composite woven fabric 42d (FIG. 7) in which a woven fabric 42a of PTFE fibers and a woven fabric 42b of organic fibers are overlapped and stitched together by a fluororesin yarn 42c. 8 and FIG. 9) and a composite woven fabric sheet 42 composed of a thermosetting synthetic resin 42e impregnated and coated on the surface of the composite woven fabric 42d and the fiber structure gap.

  In the composite woven fabric 42d, either a PTFE yarn or a FEP yarn is used as the fluorine resin yarn 42c for stitching and integrating the PTFE fiber woven fabric 42a and the organic fiber woven fabric 42b. The yarn making 42c is one of single yarn and spinning, and a yarn in the range of approximately 200 to 1,200 denier is preferably used. Both the woven fabrics 42a and 42b are stitched and integrated by the fluororesin yarn 42c by any one of comb stitching, side stitching, main reverse stitching, half reverse stitching and stitching stitching.

  The composite woven fabric sheet 42 is also manufactured by the same manufacturing method using the same manufacturing apparatus as the manufacturing apparatus shown in FIG. That is, the composite woven fabric 42d wound around the uncoiler 8 is sent to the container 12 storing the thermosetting synthetic resin varnish 11 by the feed roller 10, and the inside of the container 12 is guided by the guide rollers 13 and 14 provided in the container 12. The thermosetting synthetic resin varnish 11 is applied to the surface of the composite woven fabric 42d. Next, the composite woven fabric 42d coated with the thermosetting synthetic resin varnish 11 is sent to the compression rolls 16 and 17 by the feed roller 15, and the heat applied to the surface of the composite woven fabric 42d by the compression rolls 16 and 17 is applied. The curable synthetic resin varnish 11 is impregnated into the fiber structure gap. The solvent is then blown in the drying furnace 18 to the composite woven fabric 42d impregnated with the thermosetting synthetic resin varnish 11, and the reaction of the resin proceeds at the same time. As a result, a moldable prepreg (composite woven fabric sheet 42) is obtained. ) Is produced.

  In the woven fabric sheet 41 and the composite woven fabric sheet 42 forming the second and third surface layer materials 4, the woven fabrics 41a and 42b made of organic fibers are cotton fabric, aramid fiber woven fabric, polyester fiber woven fabric, and cotton (cotton). Fiber) and polyester resin fibers are preferably used. The woven fabrics of these woven fabrics 41a and 42b are not particularly limited, and may be any of plain weave, oblique weave, satin weave, and the like.

  The polyamide resin sheet 40 that forms the first surface layer material 4, the woven fabric sheet 41 that forms the second surface layer material 4, and the composite woven fabric sheet 42 that forms the third surface layer material 4 are each cut into desired dimensions. Then, this is placed on one surface 3 of the base body 2 made of a laminate, and heated and pressure-molded in the stacking direction to be integrally joined to the surface 3 of the base body 2. The composite woven fabric sheet 42 of the third surface material 4 is placed with the woven fabric 42 b side made of organic fibers facing the surface 3 of the base 2.

  Thus, the first, second, and third surface layer materials 4 integrally bonded onto one surface 3 of the base body 2 open at the surface 5 of the surface layer material 4 and extend to a part of the base body 2. A plurality of recesses 6 are formed. The plurality of recesses 6 are formed such that the total area of the openings of the recesses 6 occupying the area of the surface 5 of the surface layer material 4 is 20 to 30%. The recess 6 is filled and held with a solid lubricant, which will be described later, and the recess 6 occupies the area of the surface 5 of the surface layer material 4 in order to satisfactorily exhibit the sliding characteristics such as low friction of the solid lubricant. At least 20% of the total area of the openings is required. However, if the total area of the openings of the recesses 6 occupying the area of the surface 5 of the surface layer material 4 exceeds 30%, the strength of the surface layer material 4 is reduced. The recess 6 is formed by drilling using a drill, a bite, or the like.

  FIG. 5 is a cross-sectional view of the flat sliding member 1 provided with the polyamide resin sheet 40 which is the first surface layer material 4, and FIG. 6 is a flat shape including the woven fabric sheet 41 which is the second surface material 4. 7 is a sectional view of the flat sliding member 1 provided with the composite woven fabric sheet 42 which is the third surface layer material 4.

  A cylindrical sliding member 1 shown in FIG. 10 includes a cylindrical base 2 made of a laminate of fiber woven cloth reinforced thermosetting synthetic resin, and a surface layer material 4 integrally joined to the inner peripheral surface 3a of the base 2. A plurality of ring-shaped grooves 61 that are formed in the base body 2 and the surface layer material 4 so as to open at the surface 5 of the surface layer material 4 and extend to a part of the base body 2 and arranged along the longitudinal direction; The solid lubricant 7 filled and held in

  In the manufacturing apparatus of the cylindrical sliding member 1 shown in FIG. 11, two heating rollers 22 and 22 and one pressure roller 23 are arranged so as to be located at the apexes of a triangle, respectively, and a core type is arranged in the middle. 24, the core mold 24 is wound with any one of the first, second and third surface layer materials 4 for at least one turn, and then the prepreg 19 is wound around the uncoiler 25 on the outside of the surface layer material 4 as described above. , The core die 24 is driven and rotated in a certain direction, and the base 2 made of a laminate having a desired thickness is formed by pressing and heating the two heating rollers 22 and 22 and the pressure roller 23, Thereby, the cylindrical sliding member 1 which integrally joined the surface layer material 4 to the inner peripheral surface is produced.

  The surface (inner peripheral surface) 5 of the surface layer material 5 of the cylindrical sliding member 1 formed in this way is opened at the surface 5 of the surface layer material 4, and is arranged along the longitudinal direction and the base body 2. A plurality of grooves 61 extending to a part of are formed by cutting using a cutting tool or the like. The plurality of grooves 61 are formed such that the total area of the openings of the grooves 61 occupying the area of the surface 5 of the surface layer material 4 is 20 to 30%. The groove 61 fills and holds a solid lubricant, which will be described later, and the recess 6 occupies the area of the surface 5 of the surface layer material 4 in order to satisfactorily exhibit the sliding characteristics such as low friction of the solid lubricant. At least 20% of the total area of the openings is required. However, if the total area of the openings of the recesses 6 occupying the area of the surface 5 of the surface layer material 4 exceeds 30%, the strength of the surface layer material 4 is reduced.

  The solid lubricant 7 which is opened at the surface 5 of the surface layer material 4 and is filled and held in a plurality of recesses 6 or grooves 61 extending to a part of the substrate 2 is composed of 5 to 15% by weight of carbon black and a hydrocarbon wax 10. -20% by weight, aromatic polyamide resin powder 1-5% by weight, hydrocarbon oil 10-20% by weight, and the rest room temperature curable epoxy resin.

Carbon black in the component of the solid lubricant exhibits the effect of reinforcing the solid lubricant and also serves as a holding body that absorbs and holds hydrocarbon oil described later. Examples of carbon black include acetylene black, oil furnace black, thermal black, channel black, and gas furnace black. Particularly preferred are those having a primary particle diameter of about 20 nm, a DBP oil absorption of about 100 ml / 100 g, and a specific surface area of about 110 m ² / g. Specifically, “SUNBLACK X15 (trade name)” manufactured by Asahi Carbon Co., Ltd. and “MA100 (trade name)” manufactured by Mitsubishi Chemical Corporation are exemplified as preferable examples. And the compounding quantity of carbon black is 5 to 15 weight%, Preferably it is 10 to 15 weight%. When the blending amount is less than 5% by weight, the reinforcing effect of the solid lubricant is not sufficiently exhibited. When the blending amount exceeds 15% by weight, the fluidity of the solid lubricant is impaired, and the solid lubricant is filled in the recesses or grooves. There is a possibility of deteriorating workability.

  The hydrocarbon wax imparts low friction to the solid lubricant and, like carbon black, plays a role as a holding body that absorbs and holds hydrocarbon oil described later. The hydrocarbon wax is selected from at least one of paraffin wax having about 24 or more carbon atoms, olefin wax having about 26 or more carbon atoms, alkylbenzene having about 28 or more carbon atoms, and microcrystalline wax. The Specific examples of the hydrocarbon wax include a paraffin wax “150 (trade name)” manufactured by Nippon Seiwa Co., Ltd., a polyethylene wax “Lico Wax PE520 (trade name)” manufactured by Clariant Japan, and a product manufactured by Nippon Seiwa Co., Ltd. Examples thereof include microcrystalline wax “Hi-Mic-1080 (trade name)”, a mixture of polyethylene wax and paraffin wax manufactured by Nikko Fine Products, Ltd. and “Godes wax (trade name)”. And the compounding quantity of hydrocarbon wax is 10 to 20 weight%, Preferably it is 15 to 20 weight%. If the blending amount is less than 10% by weight, the solid lubricant cannot be sufficiently imparted with low friction. If the blending amount exceeds 20% by weight, the solid lubricant is bonded to the recesses or grooves formed on the sliding member base. May reduce power.

  The aromatic polyamide resin powder exhibits the effect of imparting wear resistance to the solid lubricant. The aromatic polyamide resin powder is a metaphenylene isophthalamide powder obtained by condensation polymerization of metaphenylenediamine and isophthalic acid chloride. As a preferable example, for example, “Conex (trade name)” manufactured by Teijin Ltd. Can be mentioned. And the compounding quantity of aromatic polyamide resin powder is 1 to 5 weight%, Preferably it is 3 to 5 weight%. If the blending amount is less than 1% by weight, sufficient wear resistance cannot be imparted to the solid lubricant. If the blending amount exceeds 5% by weight, not only the low friction property of the solid lubricant is impaired but also the solid lubricant. This may impair the fluidity of the sliding member and deteriorate the workability of filling the recess or groove of the sliding member base.

  Hydrocarbon oil imparts low friction to a solid lubricant, and as a lubrication form, friction generated when a sliding member embedded with a solid lubricant and a counterpart material (such as a shaft) slides. It is smoothly supplied from the solid lubricant to the sliding surface by heat, and is interposed in the sliding surface to give low friction. As hydrocarbon oils, specifically, paraffinic oil “Diana Process Oil PW (trade name)” manufactured by Idemitsu Kosan Co., Ltd., naphthenic oil “Diana Process Oil NS (trade name)” manufactured by Idemitsu Kosan Co., Ltd., Mitsui Examples thereof include poly-α-olefin “Lucanto (trade name)” manufactured by Kagaku Co., Ltd. and polybutene “NA Solvent (trade name)” manufactured by NOF Corporation. As the hydrocarbon oil used in the present invention, only a so-called base oil may be used. Antioxidants, detergent dispersants, viscosity index improvers, pour point depressants generally used as additives for lubricating oils in this base oil. In addition, those containing a friction modifier / oil agent, an anti-wear agent / extreme pressure agent, a rust preventive agent and the like may be used. And since the compounding quantity of hydrocarbon oil is absorbed and hold | maintained by carbon black and hydrocarbon type wax, a comparatively large quantity can be mix | blended, and is 10-20 weight%, Preferably it is 15-20 weight%. If the blending amount is less than 10% by weight, the low-friction property is not sufficiently imparted to the solid lubricant. If the blending amount exceeds 20% by weight, the solid lubricant flows out during molding (bleed out) and the shape of the solid lubricant is retained. There is a risk of reducing the performance.

  The room temperature curing epoxy resin is a bonding agent that bonds carbon black, hydrocarbon wax, aromatic polyamide resin powder and hydrocarbon oil to each other, and a bonding agent that bonds a solid lubricant to a substrate in a recess or groove. It plays the role of Specifically, “Resinus Bond (trade name)” manufactured by Resinas Kasei Co., Ltd., which is a two-component epoxy resin that is a room temperature curing type, can be mentioned. And the compounding quantity of a room temperature curing type epoxy resin is 40 to 55 weight%, Preferably it is 45 to 55 weight%. When the blending amount is less than 40% by weight, the role as the above-mentioned bonding agent is not sufficiently exerted, and when the blending amount exceeds 55% by weight, the role as the bonding agent for bonding the solid lubricant to the substrate in the recess or the groove is On the other hand, the proportion of the epoxy resin that does not contribute to lubrication is exposed on the surface of the solid lubricant is excessive, and the low friction effect of the hydrocarbon wax and hydrocarbon oil is lost.

  The solid lubricant and the sliding member of the present invention are formed as follows. A predetermined amount of each of the above components was weighed, charged in a mixer such as a Henschel mixer, a super mixer, a ball mill, or a dumbler, and mixed to prepare a solid lubricant kneaded product. This kneaded material is supplied to the surface layer material integrally bonded to the surface of the substrate on which the recess or groove is formed. Next, a predetermined pressure is applied to fill the kneaded material into the recesses or grooves of the surface layer material, and after filling, the epoxy resin in the components of the kneaded material is cured by leaving it for a predetermined time. Is firmly bonded and fixed in the recess or groove, thereby forming a sliding member in which the solid lubricant is embedded in the recess or groove.

  Next, the present invention will be described in detail based on examples. In addition, this invention is not limited to these Examples at all.

[Preparation of substrate]
A plain woven cotton cloth is prepared as a fiber woven cloth, and the cotton cloth is passed by a feed roller through a container storing a phenol resin varnish having a resin solid content of 64.5% by weight, and the resin varnish is applied to the surface of the cotton cloth. After impregnating the resin varnish coated on the surface of the cotton cloth with a compression roll to the gap between the fiber structures, the solvent was blown in the drying furnace and the reaction of the resin proceeded to obtain a base prepreg (resin-treated cotton cloth). . This prepreg was cut into a square shape having a side length of 30 mm, and 8 sheets thereof were overlapped.

[Production of surface material]
First surface layer material A sheet having a thickness of 0.5 mm was prepared from 12 nylon containing 5% by weight of graphite, and this was used as the first surface layer material.

Second surface layer material As a woven fabric composed of organic fibers, a plain woven cotton fabric is prepared, and the cotton fabric is fed with a phenolic resin varnish and PTFE powder ("Lublon L5 (trade name)" manufactured by Daikin Industries, Ltd.) using a feed roller. After passing through the container storing the mixed resin varnish, coating the mixed resin varnish on the surface of the cotton cloth, and impregnating the mixed resin varnish coated on the surface of the cotton cloth with a compression roll to the fiber tissue gap, The solvent was allowed to dissipate in the drying furnace and at the same time the reaction of the resin proceeded to obtain a prepreg (woven fabric sheet) comprising 30% by weight of cotton cloth, 39% by weight of phenol resin and 31% by weight of PTFE. This prepreg was cut into a square shape having a side length of 30 mm, and three of them were overlapped.

Third surface layer material A woven fabric of plain woven PTFE fibers and a plain woven cotton fabric similar to the above as a woven fabric made of organic fibers were prepared, and the woven fabric of PTFE fibers and the plain woven cotton fabric were overlapped. A PTFE yarn having a thickness of 400 denier was prepared, and a composite woven fabric was produced by stitching together the overlapped PTFE fiber woven fabric and plain woven cotton fabric in the overlapping direction. The composite woven fabric is passed by a feed roller through a container storing a phenol resin varnish having a resin solid content of 64.5% by weight, the resin varnish is applied to the surface of the composite woven fabric, and the composite woven fabric is compressed by a compression roll. After the resin varnish coated on the surface was impregnated into the gap between the fiber structures, the solvent was dissipated in the drying furnace and the reaction of the resin proceeded to obtain a prepreg (composite woven fabric sheet). This prepreg was cut into a square shape having a side length of 30 mm.

The first surface layer material, the second surface layer material, and the third surface layer material are respectively placed on the surface of the base prepreg, a molding pressure of 70 kg / cm ² in the thickness direction (overlapping direction), a molding temperature of 160 ° C., and molding. The laminate was compression molded under a condition of 20 minutes to obtain a laminate in which the substrate and the surface layer material were joined together. In the composite woven fabric sheet of the third surface layer material, the woven fabric (plain woven cotton fabric) side made of organic fibers was placed facing the surface of the base prepreg.

  A cylindrical concave portion having a diameter of 8 mm and a depth of 0.9 mm is formed by drilling the surface layer material and the substrate of the laminate in which the first surface layer material, the second surface layer material, and the third surface layer material are respectively bonded to the surface. 4 were formed (the total area of the openings of the recesses occupying the surface area of the surface layer material was 22%) to obtain a sliding member base I, a sliding member base II, and a sliding member base III, respectively.

(Production of solid lubricant)
Asahi Carbon Co., Ltd. “SUNBLACK X15 (trade name)” 10-15% by weight as carbon black, Nikko Fine Products “Godes Wax (trade name)” 16-20% by weight as hydrocarbon wax, aromatic 5% by weight of Teijin's “Conex (trade name)” as the polyamide resin powder, and Idemitsu Kosan's paraffinic oils “PW-90 (trade name)” and “PW-380 (trade name) as hydrocarbon oils. ) ”And 10 to 20% by weight of“ Resinus Bond (trade name) ”manufactured by Reginas Kasei Co., Ltd. as a room temperature curable epoxy resin (room temperature curable two-part epoxy resin). And mixed to prepare a solid lubricant kneaded product. Table 1 shows the component composition (% by weight) of the solid lubricant kneaded product.

Examples 1-9
After supplying the solid lubricant kneaded material to the sliding member base body having four cylindrical recesses on the surface, a predetermined pressure is applied to the sliding member base body and the solid lubricant kneaded material, and the solid material is left at room temperature to be solid. The room temperature curable epoxy resin in the lubricant kneaded product was cured, and the solid lubricant was filled and held in the concave portion of the sliding member base, which was used as the sliding member.

[Comparative example]
Comparative Example 1
PTFE fiber (400 denier) and glass fiber (101 denier) in a twill weave (obliquely weave) cloth (PTFE fiber occupies 70%, glass fiber ratio 30%) and phenol resin varnish (concentration 55%) ) Was impregnated with 30% by weight (as a solid content) and dried to obtain a surface layer material by cutting a PTFE unwoven cloth prepreg into a rectangular shape with a side length of 30 mm.

  A prepreg is prepared by impregnating 45% by weight (as a solid content) of a phenolic resin varnish (same as above) into a blended fabric made of thermoplastic polyester fiber (65% by weight) and cotton fiber (35% by weight). The prepreg was cut into a square shape with a side length of 30 mm, and 10 sheets of these were stacked to form a substrate.

70% of the PTFE fiber in the surface layer material is placed on the base and compressed in the thickness direction (overlapping direction) under conditions of a molding pressure of 50 kg / cm ² , a molding temperature of 150 ° C., and a molding time of 5 minutes. The laminated body which shape | molded and integrally joined the base | substrate and the surface layer material was obtained, and this was made into the sliding member.

Comparative Example 2
As a woven fabric, an aramid fiber woven fabric obtained by plain weaving copolyparaphenylene 3,4′oxydiphenylene terephthalamide resin fiber (“Technora (trade name)” manufactured by Teijin Ltd.) is prepared. In a feed roller, the mixture is passed through a container in which a mixed resin varnish of epoxy resin and PTFE (“Lublon L5 (trade name)” manufactured by Daikin Industries, Ltd.) is stored, and the mixed varnish is applied to the surface of the aramid fiber woven fabric. After coating and impregnating the mixed resin varnish coated on the surface of the aramid fiber woven fabric with a compression roll to the fiber structure gap, the solvent is dissipated in the drying furnace and the reaction of the resin is advanced at the same time. A prepreg composed of 30% by weight of a fiber woven fabric, 31% by weight of PTFE and 39% by weight of an epoxy resin was prepared, and the prepreg was cut into a rectangular shape with a side length of 30 mm. It was used as a surface layer material.

A surface layer material is placed on a substrate formed by stacking 10 prepregs cut into a rectangular shape with a side length of 30 mm, which is the same as that of the substrate of the above example, and a molding pressure of 70 kg / cm ² is formed in the thickness direction. Compression molding was performed under the conditions of a temperature of 160 ° C. and a molding time of 10 minutes to obtain a laminate in which the substrate and the surface layer material were integrally joined, and this was used as a sliding member.

  Next, the friction performance of the sliding members of Examples 1 to 9 and Comparative Examples 1 and 2 was tested in the thrust tests (1) and (2). Test conditions are shown in Table 2 and Table 3, and test results in each test are shown in Table 4 and Table 5.

(Table 2)
Test conditions (1)
Surface pressure 19.6 N / mm ² (200 kgf / cm ² )
Speed 0.5m / min
Endurance time 72 hours Lubrication Non-lubricating material SUS304
Test method A mating material is fixed on the stand of a biaxial testing machine, and the solid lubricant filling side (in the case of a comparative example, the surface layer side) of the sliding member is slidably brought into contact with the mating material. A load was applied to the sliding member so that the surface pressure was 19.6 N / mm ² , the counterpart material side was vibrated at the above speed (± 50 mm), and the coefficient of friction was measured every 12 hours.

(Table 3)
Test conditions (2)
Surface pressure 19.6 N / mm ² (200 kgf / cm ² )
Speed 30mm / sec ~ 500mm / sec
Lubrication No lubrication for sliding members of Examples 1 to 9 and Comparative Example 2
For the sliding member of Comparative Example 1, apply grease to the sliding surface.
Test method Fixing the mating material on the stand of the biaxial testing machine, and making the mating material slidably contact the solid lubricant filling side of the sliding member (in the case of the comparative example, the surface layer side), A load was applied to the sliding member so that the surface pressure was 19.6 N / mm ² (constant), the counterpart material side was vibrated at the above speed (stroke ± 100 mm), and the friction coefficient at each speed was measured.

  As is apparent from the above test results, Examples 1 to 9 show stable sliding with a low coefficient of friction throughout the test time in the durability test under the test condition (1), and the speed dependence of the test condition (2). Also in the test on the property, the result showed that the variation of the friction coefficient with respect to the change in speed was extremely small, in other words, the dependence on speed was extremely small. On the other hand, Comparative Examples 1 and 2 showed a high coefficient of friction in both tests. In particular, in the speed dependence test of test condition (2), an increase in the coefficient of friction was observed according to the change in speed, indicating that the speed dependence was extremely large.

  The quality of the speed dependence test results will determine whether or not the sliding member can be applied to a sliding seismic isolation device. If a sliding member with excellent speed dependence is applied to a sliding seismic isolation device, the sliding will start. The seismic isolation cycle can be extended while keeping the acceleration of the earthquake small, and transmission of vibration to the structure can be reduced from vibration due to large-scale earthquakes to vibrations due to small-scale earthquakes, etc. This brings about the effect that reliable protection can be achieved.

  As described above, the sliding member of the present invention provides a sliding member such as a bearing or a sliding plate having a low friction property that can be applied to a part requiring low friction property in a wide range of fields. Can do.

It is a top view of the sliding member of this invention. It is a top view of the other example of the sliding member of this invention. It is explanatory drawing which shows the manufacturing process of the base | substrate of a sliding member. It is a description perspective view of the lamination method of a prepreg. It is sectional drawing of the sliding member provided with the 1st surface layer material of this invention. It is sectional drawing of the sliding member provided with the 2nd surface layer material of this invention. It is sectional drawing of the sliding member provided with the 3rd surface layer material of this invention. It is a top view which shows a composite woven fabric. It is the IX-IX sectional view taken on the line of FIG. It is sectional drawing of the cylindrical sliding member of this invention. It is explanatory drawing which shows the manufacturing apparatus of the cylindrical sliding member of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sliding member 2 Base | substrate 4 Surface layer material 6 Recessed part 7 Solid lubricant 40 Polyamide resin sheet 41 Woven cloth sheet 42 Composite woven cloth sheet

Claims (11)

  A substrate made of a laminate of a fiber woven fabric reinforced thermosetting synthetic resin, a surface layer material integrally bonded to one surface of the substrate, and a portion of the substrate that opens to the surface of the substrate and the surface layer material on the surface layer material And a solid lubricant filled and held in the recess or groove. The solid lubricant comprises 5 to 15% by weight of carbon black and 10 to 20 hydrocarbon wax. A sliding member comprising 1% by weight, 1 to 5% by weight of an aromatic polyamide resin powder, 10 to 20% by weight of a hydrocarbon oil, and the balance of an ordinary temperature curable epoxy resin.   The sliding member according to claim 1, wherein the surface layer material is made of a polyamide resin sheet, and is integrally bonded to one surface of the base on one surface of the sheet.   The sliding member according to claim 2, wherein the polyamide resin sheet is a 12 nylon sheet.   The surface layer material is made of at least one woven fabric sheet composed of a woven fabric made of organic fibers and a thermosetting synthetic resin containing a tetrafluoroethylene resin impregnated and coated on the surface of the woven fabric and the fiber structure gap. The sliding member according to claim 1.   The surface layer material is a composite woven fabric in which a woven fabric of ethylene tetrafluoride resin fibers and a woven fabric of organic fibers are overlapped and integrated by stitching with a fluororesin yarn, and thermosetting applied to the composite woven fabric by impregnation. The sliding member according to claim 1, comprising a composite woven fabric sheet made of a synthetic synthetic resin and integrally joined to one surface of the substrate on the organic fiber woven fabric side.   6. The sliding member according to claim 5, wherein the fluororesin yarn is selected from any one of a yarn made of ethylene tetrafluoride resin and a yarn made of ethylene tetrafluoride / hexafluoropropylene copolymer.   The sliding member according to claim 5 or 6, wherein the fluororesin yarn is one of single yarn and spinning, and is generally in the range of 200 to 1,200 denier.   The sliding member according to any one of claims 4 to 7, wherein the organic fibers are selected from cotton fibers, aramid fibers, polyester fibers, and mixed fibers of cotton fibers and polyester fibers.   The hydrocarbon wax is selected from at least one of paraffin wax having approximately 24 or more carbon atoms, olefin wax having approximately 26 or more carbon atoms, alkylbenzene having approximately 28 or more carbon atoms, and microcrystalline wax. The sliding member according to any one of claims 1 to 8, wherein the sliding member is one.    The sliding member according to any one of claims 1 to 9, wherein the aromatic polyamide resin powder is a powder of metaphenylene isophthalamide obtained by condensation polymerization of metaphenylenediamine and isophthalic acid chloride.   The sliding member according to any one of claims 1 to 10, wherein the hydrocarbon oil is a hydrocarbon-based mineral oil or a hydrocarbon-based synthetic oil.

Images