Carbon fiber aggregates and process for production of same
AssigneeShowa Denko K.K.
InventorEiji Kambara
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Abstract
A method of producing a carbon fiber aggregate, including bringing a supported catalyst into contact with a carbon-containing compound in a heated zone, the supported catalyst being prepared by heat-treating aluminum hydroxide which has a BET specific surface area of 1 m2/g or less and a cumulative 50% volume particle diameter of 10 to 300 μm until the BET specific surface area reaches to 50 to 200 m2/g, thereby yielding a support, and then supporting a metal catalyst or a catalytic metal precursor on the support. Also provided is a carbon fiber aggregate produced by the method, a resin composite material including the carbon fiber aggregate, and a catalyst for producing the carbon fiber aggregate.
Claims11
A method of producing a carbon fiber aggregate, comprising the steps of:
- preparing aluminum hydroxide which has a BET specific surface area of 1 m2/g or less and has a cumulative 50% volume particle diameter (D50) of 10 to 300 μm;
- yielding a catalyst support by heat-treating the aluminum hydroxide until the BET specific surface area reaches 50 to 200 m2/g;
- having a catalytic metal or a catalytic metal precursor be supported on the catalyst support;
- and
- contacting the catalyst with a carbon-containing compound in a heated zone.
A carbon fiber aggregate, comprising a cocoon-shaped aggregate clump having a major/minor diameter ratio of 5 or more formed by agglomerating secondary aggregate fibers, each of the secondary aggregate fibers having a diameter of 1 μm or more and a length of 5 μm or more and being non-linear, which secondary aggregate fibers are formed by agglomerating non-linear carbon fibers, the non-linear carbon fibers each having a diameter of 5 to 100 nm and an aspect ratio of 5 to 1000, and the non-linear carbon fibers comprising graphitic layers which extend approximately parallel to a fiber axis.
A catalyst for producing a carbon fiber aggregate, which is prepared by the steps of:
- preparing aluminum hydroxide which has a BET specific surface area of 1 m2/g or less and has a cumulative 50% volume particle diameter (D50) of 10 to 300 μm;
- yielding a catalyst support by heat-treating the aluminum hydroxide until the BET specific surface area reaches 50 to 200 m2/g;
- and
- having a catalytic metal or a catalytic metal precursor be supported on the catalyst support.
Dependencies are inferred from the claim text.