US 12,312,552 B2
Agent for forming solid lubricating coating film, oil country tubular goods, threaded joint for oil country tubular goods, and method for manufacturing oil country tubular goods
Yasuhide Ishiguro, Tokyo (JP); Seigo Goto, Tokyo (JP); Takashi Koga, Tokyo (JP); Takamasa Kawai, Tokyo (JP); Seiji Ozaki, Tokyo (JP); Hideo Sato, Tokyo (JP); Sachiko Fujimoto, Tokyo (JP); Koichi Shoda, Tokyo (JP); Akira Okubo, Tokyo (JP); Ryota Kobayashi, Tokyo (JP); Ryota Kubo, Tokyo (JP); and Kota Toyosawa, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP); and TOYO DRILUBE CO., LTD., Tokyo (JP)
Appl. No. 18/564,142
Filed by JFE STEEL CORPORATION, Tokyo (JP); and TOYO DRILUBE CO.,LTD., Tokyo (JP)
PCT Filed May 24, 2022, PCT No. PCT/JP2022/021279
§ 371(c)(1), (2) Date Nov. 27, 2023,
PCT Pub. No. WO2022/255167, PCT Pub. Date Dec. 8, 2022.
Claims priority of application No. 2021-091462 (JP), filed on May 31, 2021.
Prior Publication US 2024/0254404 A1, Aug. 1, 2024
Int. Cl. C10M 111/04 (2006.01); C10M 103/02 (2006.01); C10M 103/06 (2006.01); C10M 107/32 (2006.01); C10M 107/38 (2006.01); C10M 169/04 (2006.01); C10M 177/00 (2006.01); C10N 20/00 (2006.01); C10N 20/06 (2006.01); C10N 40/34 (2006.01); C10N 50/02 (2006.01); C10N 70/00 (2006.01); E21B 17/042 (2006.01); F16L 15/00 (2006.01)
CPC C10M 111/04 (2013.01) [C10M 103/02 (2013.01); C10M 103/06 (2013.01); C10M 107/32 (2013.01); C10M 107/38 (2013.01); C10M 169/04 (2013.01); C10M 177/00 (2013.01); C10M 2201/0413 (2013.01); C10M 2201/0663 (2013.01); C10M 2201/0873 (2013.01); C10M 2201/1033 (2013.01); C10M 2201/123 (2013.01); C10M 2209/1033 (2013.01); C10M 2213/0623 (2013.01); C10N 2020/06 (2013.01); C10N 2020/063 (2020.05); C10N 2040/34 (2013.01); C10N 2050/02 (2013.01); C10N 2070/00 (2013.01); E21B 17/042 (2013.01); F16L 15/001 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An agent for forming a solid lubricating coating film with a thickness of 10 μm or more and 150 μm or less in a thread portion of oil country tubular goods, wherein
two or more types of solid lubricants dispersed in a binder resin,
the combination of solid lubricants comprises:
graphite in an amount of 50% or more and 90% or less of a total weight of the solid lubricants, the graphite having a scaly shape and an average particle diameter of 10.0 μm or less, and
one or more solid lubricants selected from the group consisting of: BN (boron nitride), mica, talc, MCA (melamine cyanurate), MoS2 (molybdenum disulfide), PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxyalkane; tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin), and FEP (perfluoroethylene propene copolymer; tetrafluoroethylene-hexafluoropropylene copolymer) as other solid lubricants,
the binder resin contains a PEEK resin having an average particle diameter of 20 μm or less as a main component, the PEEK resin being contained in an amount of 70% or more of a total weight of the binder resin,
the total weight of the solid lubricants is 0.8 times or more and 2 times or less the total weight of the binder resin,
a content of the graphite as the solid lubricant is 28% or more and 45% or less of a sum of the total weight of the solid lubricants and the total weight of the binder resin, and
an average particle diameter of the other solid lubricants is in a range of 0.1 μm or more and 5 μm or less.