摘要:
A method of producing a piping component seal member 22 having excellent chlorine resistance includes a first step and a second step. The first step includes oxidizing first carbon nanofibers produced by a vapor growth method to obtain surface-oxidized second carbon nanofibers. The second step includes mixing carbon black having an average particle diameter of 50 nm to 10 micrometers and the second carbon nanofibers into an ethylene-propylene rubber, and dispersing the carbon black and the second carbon nanofibers in the ethylene-propylene rubber by applying a shear force.
摘要:
A heat-resistant seal material 130a and 130b of the invention includes 100 parts by weight of a ternary fluoroelastomer, 1 to 30 parts by weight of vapor-grown carbon fibers having an average diameter of more than 30 nm and 200 nm or less, and carbon black having an average particle diameter of 25 to 500 nm. The heat-resistant seal material 130a and 130b contains the vapor-grown carbon fibers and the carbon black in an amount of 20 to 40 parts by weight in total. The heat-resistant seal material 130a and 130b has a compression set when subjected to a compression set test at a compression rate of 25% and a temperature of 200°C for 70 hours of 0 to 15% and a dynamic modulus of elasticity at 200°C (E'/200°C) of 30 to 100 MPa.
摘要:
A method of producing a carbon fiber composite material (50) includes a first step and a second step. The first step includes oxidizing first carbon nanofibers produced by a vapor growth method to obtain second carbon nanofibers (40) having an oxidized surface. The second step includes mixing the second carbon nanofibers (40) into an elastomer (30), and uniformly dispersing the carbon nanofibers (40) in the elastomer (30) by applying a shear force to obtain the carbon fiber composite material (50). The second carbon nanofibers (40) obtained by the first step have a surface oxygen concentration measured by X-ray photoelectron spectroscopy (XPS) of 2.6 to 4.6 atm%.
摘要:
A method of producing carbon nanofibers includes grinding untreated carbon nanofibers produced by a vapor growth method. The untreated carbon nanofibers are ground so that the ground carbon nanofibers have a tap density 1.5 to 10 times higher than that of the untreated carbon nanofibers. A method of producing a carbon fiber composite material includes mixing carbon nanofibers 40 into an elastomer 30, and uniformly dispersing the carbon nanofibers 40 in the elastomer 30 by applying a shear force to obtain a carbon fiber composite material.
摘要:
A carbon fiber composite material includes an elastomer 30 and carbon nanofibers 40 uniformly dispersed in the elastomer 30. The carbon nanofibers are produced by a vapor growth method and then heated at a temperature that is in a range from 1100 to 1600°C and is higher than the reaction temperature employed in the vapor growth method.