Ultraviolet curable resin composition, sliding member, and method for producing sliding member

{
  "publication_number": "US10053645B2",
  "country": "US",
  "kind": "B2",
  "title": "Ultraviolet curable resin composition, sliding member, and method for producing sliding member",
  "abstract": "There is provided a resin composition for a machinable liner of a sliding member. An ultraviolet curable resin composition for a self-lubricating liner contains a (meth)acrylate compound having an isocyanuric acid ring represented by the following formula and PTFE as a solid lubricant. In the formula (1), X is a group which contains an acryloyl group and is composed only of C, H, and O. Y and Z are groups each composed only of C, H, and O. PTFE is contained in an amount of 10 to 50% by weight with respect to a total amount of the ultraviolet curable resin composition. The ultraviolet curable resin composition is suitable for a self-lubricating liner 24 of a spherical bearing 20 having an outer race 22 and an inner race 26.",
  "claims": [
    "1. An ultraviolet curable resin composition for a self-lubricating liner, comprising: fumed silica in an amount of 5% by weight or less with respect to the total amount of the ultraviolet curable resin composition; a polytetrafluoroethylene resin as a solid lubricant in an amount of 10% to 50% by weight with respect to the total amount of the ultraviolet curable resin composition; a photopolymerization initiator in an amount of 0.01% to 5% by weight with respect to the total amount of the ultraviolet curable resin composition; a (meth)acrylate compound having an isocyanuric acid ring in an amount of 20% to 85.5% by weight with respect to the total amount of the ultraviolet curable resin composition, wherein the (meth)acrylate compound having the isocyanuric acid ring is selected from the group consisting of di-(2-acryloxyethyl) isocyanurate, tris-(2-acryloxyethyl) isocyanurate, ε-caprolactone modified tris-(2-acryloxyethyl) isocyanurate, and a mixture of the di-(2-acryloxyethyl) isocyanurate and the tris-(2-acryloxyethyl) isocyanurate; optionally, melamine cyanurate in an amount of 30% by weight or less with respect to the total amount of the ultraviolet curable resin composition; optionally, at least one selected from the group consisting of bisphenol A-type epoxy acrylate, hydroxyethyl(meth)acrylate, isobornyl (meth)acrylate, pentaerythritol triacrylate, and dipentaerythritol hexa(meth)acrylate in an amount of 30% by weight or less with respect to the total amount of the ultraviolet curable resin composition; and optionally, glass fiber in an amount of 15% by weight or less with respect to the total amount of the ultraviolet curable resin composition, wherein the combined amount of the (meth)acrylate compound having the isocyanuric acid ring, the polytetrafluoroethylene resin as a solid lubricant, the photopolymerization inhibitor, the fumed silica, the melamine cyanurate, the at least one selected from the group consisting of bisphenol A-type epoxy acrylate, hydroxyethyl(meth)acrylate, isobornyl (meth)acrylate, pentaerythritol triacrylate, and dipentaerythritol hexa(meth)acrylate, and the glass fiber is 92.0% by weight or greater with respect to the total amount of the ultraviolet curable resin composition.",
    "2. The ultraviolet curable resin composition according to claim 1, wherein the (meth)acrylate compound having the isocyanuric acid ring is a mixture of di-(2-acryloxyethyl) isocyanurate and tris-(2-acryloxyethyl) isocyanurate, or ε-caprolactone modified tris-(2-acryloxyethyl) isocyanurate.",
    "3. The ultraviolet curable resin composition according to claim 1, further comprising melamine cyanurate in an amount of 30% by weight or less with respect to the total amount of the ultraviolet curable resin composition.",
    "4. The ultraviolet curable resin composition according to claim 1, wherein the polytetrafluoroethylene resin is in a powder form having an average particle diameter ranging from 75 μm to 180 μm.",
    "5. The ultraviolet curable resin composition according to claim 1, wherein the polytetrafluoroethylene resin is a polytetrafluoroethylene resin surface-treated by epoxy modified acrylate.",
    "6. The ultraviolet curable resin composition according to claim 1, wherein the polytetrafluoroethylene resin is present in an amount of 30% by weight to 50% by weight with respect to the total amount of the ultraviolet curable resin composition.",
    "7. The ultraviolet curable resin composition according to claim 1, further comprising a thermosetting agent.",
    "8. The ultraviolet curable resin composition according to claim 1, further comprising at least one selected from the group consisting of bisphenol A-type epoxy acrylate, hydroxyethyl(meth)acrylate, isobornyl (meth)acrylate, pentaerythritol triacrylate, and dipentaerythritol hexa(meth)acrylate.",
    "9. The ultraviolet curable resin composition according to claim 1, further comprising urethane acrylate.",
    "10. The ultraviolet curable resin composition according to claim 1, further comprising ethylene glycol di(meth)acrylate.",
    "11. The ultraviolet curable resin composition according to claim 1, further comprising glass fiber.",
    "12. The ultraviolet curable resin composition according to claim 7, wherein the thermosetting agent is an organic peroxide or azo compound.",
    "13. The ultraviolet curable resin composition according to claim 12, wherein the thermosetting agent is the azo compound.",
    "14. The ultraviolet curable resin composition according to claim 1, wherein the (meth)acrylate compound having the isocyanuric acid ring is ε-caprolactone modified tris-(2-acryloxyethyl) isocyanurate.",
    "15. The ultraviolet curable resin composition according to claim 1, further comprising at least one selected from the group consisting of hydroxyethyl(meth)acrylate and isobornyl (meth)acrylate.",
    "16. A self-lubricating liner made of the ultraviolet curable resin composition for the self-lubricating liner defined in claim 1.",
    "17. A method for forming a self-lubricating liner on a surface of an object comprising: applying the ultraviolet curable resin composition defined in claim 1 on the surface of the object; and curing the ultraviolet curable resin composition by irradiation with ultraviolet rays to form the self-lubricating liner on the surface of the object."
  ],
  "description_excerpt": "Field of the Invention\n\nThe present invention relates to an ultraviolet curable resin composition for forming a self-lubricating liner of a sliding member such as an unlubricated sliding bearing and a reamer bolt, a sliding member provided with the self-lubricating liner, and a manufacturing method for producing the sliding member.\n\nDescription of the Related Art\n\nA sliding bearing in which a shaft of rotary motion or translational motion is held by a sliding surface has been widely used. In particular, an unlubricated sliding bearing using no lubricating oil for a sliding surface has been used for applications requiring low friction coefficient, high durability, high load capacity, high heat resistance, high oil resistance, and the like, such as vessel or ship application and aircraft application.\n\nAs the unlubricated sliding bearing, Patent Literature 1 (Japanese Patent Application Laid-open No. 2007-255712) discloses a spherical bearing for high-load application including an outer race member having a concave first bearing surface and an inner race member having a convex second bearing surface slidably movable relative to the first bearing surface. In the spherical bearing, one of the outer race member and the inner race member is made of titanium alloy which has a bearing surface made of titanium nitride formed on the titanium alloy surface by a physical vapor deposition method (PVD). The bearing surface of the other member includes a self-lubricating liner made from resin. The self-lubricating liner is composed of a fabric including fibers of polytetrafluoroethylene (PTFE) and polyaramid.",
  "cpc": [
    "C08F 2/48",
    "B05D 3/067",
    "C08F 114/26",
    "C08F 220/34",
    "C08F 220/343",
    "C08F 220/346",
    "C08F 2220/343",
    "C08F 2220/346",
    "C08F 226/06",
    "C08F 2800/20",
    "C09D 127/18",
    "C09D 133/14",
    "C09J 4/06",
    "C10M 105/70",
    "C10M 107/42",
    "C10M 125/26",
    "C10M 125/28",
    "C10M 2201/105",
    "C10M 2201/12",
    "C10M 2213/0623",
    "C10M 2215/305",
    "C10N 2040/02",
    "C10N 2050/08",
    "C10N 2240/02",
    "C10N 2250/08",
    "F16C 17/02",
    "F16C 17/12",
    "F16C 2208/32",
    "F16C 2208/58",
    "F16C 2208/72",
    "F16C 2223/30",
    "F16C 2226/52",
    "F16C 23/045",
    "F16C 33/00",
    "F16C 33/201",
    "F16C 33/208",
    "F16C 43/02",
    "Y02T 10/86"
  ],
  "ipc": [
    "C08F 220/34",
    "B05D 3/06",
    "C09D 127/18",
    "C09D 133/14",
    "C10M 107/42",
    "C10M 125/26",
    "C10M 125/28",
    "F16C 17/12",
    "F16C 23/04",
    "F16C 33/20",
    "C08F 114/26",
    "C08F 2/48",
    "C08F 226/06",
    "C10M 105/70",
    "F16C 33/00",
    "F16C 43/02"
  ],
  "assignees": [
    "Minebea Co Ltd"
  ],
  "inventors": [
    "Tadahiko KARAKI",
    "Kunihiro Matsumoto",
    "Koichiro SAGIYAMA"
  ],
  "filing_date": "2016-09-28",
  "publication_date": "2018-08-21",
  "grant_date": "2018-08-21",
  "priority_date": "2012-04-26",
  "application_number": "US-201615278456-A",
  "family_id": "49482742",
  "cited_by_count": 1,
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}