The invention discloses a
colloid quick removing method for a carbon
fiber, comprising the following steps of: a, connecting two ends of the carbon
fiber, which is needed to remove the
colloid, to the
anode and the
cathode of a power supply; b, electrifying the carbon
fiber to emit heat; c, measuring the surface temperature of the carbon fiber via a temperature sensor; d, controlling the current so as to control the surface temperature of the carbon fiber, thereby enabling the temperature to satisfy a condition of quickly melting and volatilizing the surface
colloid without reducing the mechanical properties of the carbon fiber; e, controlling the colloid removing time, and rolling up the carbon fiber after removing the colloid. On one hand, the surface colloid is melted and volatilized by the heat emitted by the carbon fiber, which solves the defects of long temperature
rise time, low colloid removing efficiency, energy wastage and the like of the conventional gaseous oxidation colloid removing mode in which a heat source is arranged at outside of the heated carbon fiber and the
heat transfer is finished by
convection,
radiation and conduction, and is economic and
environmentally friendly; on the other hand, the carbon fiber is heated under protective
atmosphere, the
heating temperature is high, the colloid is removed completely, simultaneously, damage on the surface of the carbon fiber is avoided, the mechanical properties of the carbon fiber are not changed greatly, and strength of the carbon fiber used as a
composite material reinforcement is guaranteed.