Carbon fiber composite resin material and method of producing the same
AssigneeNissin Kogyo Co., Ltd.
InventorsToru Noguchi, Akira Magario, Morinobu Endo
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Abstract
A method of producing a carbon fiber composite resin material including (a) a first mixing step, (b) a second mixing step, and (c) a step of curing a second mixture. In the first mixing step (a), an epoxy resin is mixed with an epoxidized elastomer to obtain a first mixture. In the second mixing step (b), vapor-grown carbon fibers having an average diameter of 20 to 200 nm and an average length of 5 to 20 micrometers are mixed with the first mixture to obtain a second mixture in which the vapor-grown carbon fibers are dispersed. In the step (c) of curing the second mixture, the second mixture is cured to obtain a highly rigid carbon fiber composite resin material.
Claims2
A method of producing a carbon fiber composite resin material comprising:
- (a) a first mixing step of mixing an epoxy resin with an epoxidized elastomer to obtain a first mixture;
- (b) a second mixing step of mixing using an open-roll method with a roll distance of 0.1 mm to 0.5 mm at 0 to 50° C. vapor-grown carbon fibers having an average diameter of 20 to 200 nm and an average length of 5 to 20 micrometers with the first mixture to obtain a second mixture in which the vapor-grown carbon fibers are dispersed;
- (c) a step of curing the second mixture;
- and
- (d) adding a curing agent for the epoxy resin before step (c),
- wherein the vapor-grown carbon fibers are rigid fibers having an average value of bending indices defined by the following expression (1) of 5 to 15,
- Bending index=Lx÷D (1)
- Lx:
- length of linear portion of the vapor-grown carbon fiber, and
- D:
- diameter of the vapor-grown carbon fiber, and
- wherein the epoxidized elastomer is present in the carbon fiber composite resin material in an amount of more than 10 and less than 40 wt %.
Dependencies are inferred from the claim text.