Seal member
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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Abstract
A seal member includes a hydrogenated acrylonitrile-butadiene rubber (HNBR) and carbon nanofibers. The seal member has a number of cycles to fracture of 7000 or more when subjected to a tensile 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 exhibits excellent abrasion resistance.
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Citations
20 Claims
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1. A carbon fiber composite material seal member comprising a hydrogenated acrylonitrile-butadiene rubber (HNBR) and carbon nanofibers, wherein
the 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.- View Dependent Claims (2, 3, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18)
g1;
mass (g) of specimen before abrasion test,g2;
mass (g) of specimen after abrasion test,P;
load (N) of weight,L;
abrasion distance (m), andd;
specific gravity (g/cm3).
- C., a maximum tensile stress of 4 N/mm, and a frequency of 1 Hz,
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6. The seal member according to claim 1, the seal member being used for an oilfield apparatus.
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7. The seal member according to claim 6, wherein the oilfield apparatus is a logging tool that performs a logging operation in a borehole.
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8. The seal member according to claim 6, the seal member being an endless seal member that is disposed in the oilfield apparatus.
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9. The seal member according to claim 6, the seal member being a stator of a fluid-driven motor that is disposed in the oilfield apparatus.
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10. The seal member according to claim 9, wherein the fluid-driven motor is a mud motor.
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11. The seal member according to claim 6, the seal member being a rotor of a fluid-driven motor that is disposed in the oilfield apparatus.
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12. The seal member according to claim 11, wherein the fluid-driven motor is a mud motor.
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13. The seal member according to claim 1, wherein the hydrogenated acrylonitrile-butadiene rubber (HNBR) has an acrylonitrile content of 30 to 50 mass %, a Mooney viscosity (ML1+4100°
- C.) center value of 50 to 100, and a hydrogenation rate of 90% or more.
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14. The seal member according to claim 1, wherein the filler is carbon black having an average particle diameter of 10 to 100 nm.
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16. The seal member according to claim 1, wherein the filler is at least one material selected from silica, talc, and clay, and has an average particle diameter of 5 to 50 nm.
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18. The seal member according to claim 1, the seal member having a ratio (Nb/Na) of a number of cycles to fracture Nb when subjected to a tension fatigue test at a temperature of 150°
- C., a maximum tensile stress of 2.5 N/mm, and a frequency of 1 Hz to a number of cycles to fracture Na when subjected to a tension fatigue test at a temperature of 150°
C., a maximum tensile stress of 2 N/mm, and a frequency of 1 Hz, of 0.7 or more.
- C., a maximum tensile stress of 2.5 N/mm, and a frequency of 1 Hz to a number of cycles to fracture Na when subjected to a tension fatigue test at a temperature of 150°
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4. A carbon fiber composite material seal member comprising a hydrogenated acrylonitrile-butadiene rubber (HNBR) and carbon nanofibers, wherein
the 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 14 to 100 parts by mass of the carbon nanofibers and 0 to 60 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 (3) and (4),
Wt=0.1W1+W2
(3)
20≦
Wt≦
100
(4)W1;
amount (parts by mass) of filler, andW2;
amount (parts by mass) of carbon nanofibers,the carbon nanofibers have an average diameter of 60 to 110 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.- View Dependent Claims (5, 15, 17, 19, 20)
- C., a maximum tensile stress of 4 N/mm, and a frequency of 1 Hz,
Specification