National Institute of Advanced Industrial Science and Technology

Zeon Corporation

Shigeki Tomonoh

Kenji Hata

Seisuke Ata

Masaaki Komatsu

Anna Komatsu

Provided is a cross-linked rubber that can improve long-term sealing properties of a seal member in high-temperature and high-pressure environments. The cross-linked rubber is obtained through cross-linking of a cross-linkable rubber composition containing a fluororubber, carbon black, one or more carbon nanotubes, and an organic peroxide cross-linker, and has a 50% modulus of 5 MPa or more, a compression set (230&#xb0; C., 500 hours) of 80% or less, and a rate of change of elongation at break between before and after a heat aging test (230&#xb0; C., 72 hours) of not less than &#x2212;10% and not more than 10%.

Cross-linked rubber and production method therefor

A carbon nanotube-elastomer composite material according to the present invention is produced by dispersing a carbon nanotube in an elastomer, including a carbon nanotube having a diameter of 20 nm or less, the number of layers of 10 or less, the carbon nanotube being contained in an amount of 0.1 to 20 parts by weight inclusive relative to the total weight of the carbon nanotube and the elastomer, and a continuous network having a Va/Vvalue of 0.5 or more is formed in the elastomer wherein Vrepresents the initial volume of the composite material and Va represents the volume of the structure formed from the remaining carbon nanotubes when the composite material is maintained at a temperature of 400&#xb0; C. or higher for 6 hours while introducing nitrogen, the elastomer is thermally decomposed and the remaining carbon nanotubes form a structure.

Carbon nanotube-elastomer composite material, seal material and sealing material each produced using same, and method for producing carbon nanotube-elastomer composite material

Growing community of inventors

Tsukuba, Japan

Shigeki Tomonoh