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Seal member

  • US 8,614,273 B2
  • Filed: 12/28/2009
  • Issued: 12/24/2013
  • Est. Priority Date: 12/28/2009
  • Status: Expired due to Fees
First Claim
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1. A carbon fiber composite material seal member comprising a hydrogenated acrylonitrile-butadiene rubber (HNBR) and carbon nanofibers, whereinthe seal member has a number of cycles to fracture of 7000 or more when subjected to a tension fatigue test at a temperature of 70°

  • C., a maximum tensile stress of 4 N/mm, and a frequency of 1 Hz,the seal member includes 10 to 60 parts by mass of the carbon nanofibers and 0 to 100 parts by mass of a filler having an average particle diameter of 5 to 100 nm based on 100 parts by mass of the hydrogenated acrylonitrile-butadiene rubber (HNBR),the amount of the carbon nanofibers and the amount of the filler satisfy the following expressions (1) and (2),
    Wt=0.1W1+W2 



    (1)
    20

    Wt≦

    60 



    (2)W1;

    amount (parts by mass) of filler, andW2;

    amount (parts by mass) of carbon nanofibers,the carbon nanofibers have an average diameter of 10 to 20 nm,the carbon nanofibers have an average rigidity of 3 to 12 before the carbon nanofibers are mixed into the hydrogenated acrylonitrile-butadiene rubber (HNBR), the rigidity being defined by Lx÷

    D (Lx;

    distance between adjacent defects of carbon nanofiber, D;

    diameter of carbon nanofiber), andthe carbon fiber composite material in an uncrosslinked form has a fraction (fnn) of components having a second spin-spin relaxation time of 0 to 0.2 measured for 1H at 150°

    C. by the Hahn-echo method using the pulsed NMR technique.

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