| 摘要 |
The present invention relates to a dope-dyed aramid short fiber and a manufacturing method thereof wherein the dope-dyed aramid short fiber is composed of a wholly aromatic polyamide including one or more kinds of coloring substances selected from a gray pigment, a black pigment, a gray dye, and a black dye; an L^* value of the aramid short fibers which is brightness index is 20 to 70; a length of the aramid short fibers is 2 mm or less; a drainability of the aramid fibers is below 500 mL; and a specific surface area of the aramid short fiber is 5 to 12 m^2/g. The dope-dyed aramid short fiber according to the present invention has a gray or black color instead of a yellow color specific to an aramid short fiber because the dope-dyed aramid short fiber includes a gray or black coloring substance. Accordingly the dope-dyed aramid short fiber according to the present invention is not discriminated when the dope-dyed aramid short fiber is used as a stiffener for brake pads, clutches, gaskets, etc. because the color of the dope-dyed aramid short fiber is similar to that of other materials such as brake pads, thereby improving the appearance thereof and preventing doubt about performance thereof. |
