Antistatic agent, antistatic polyamide composition, and preparation methods of antistatic agent and antistatic polyamide composition

The invention discloses an antistatic agent, an antistatic polyamide composition, and preparation methods of the antistatic agent and the antistatic polyamide composition. The antistatic agent contains expanded graphite having the surface modified by a polyethylene glycol type antistatic agent, wherein the mass ratio of the expanded graphite to the polyethylene glycol type antistatic agent is 1 to (2-8). The preparation method of the antistatic agent comprises the steps: mixing a polyethylene glycol type antistatic agent solution and the expanded graphite evenly, stirring for 4-6 h, carrying out solid-liquid separation, and drying. The antistatic polyamide composition contains the antistatic agent and polyamide, wherein the mass ratio of the antistatic agent to polyamide is (4-10) to (56-100). The preparation method of the antistatic polyamide composition comprises the steps of drying the antistatic polyamide composition, carrying out melt mixing, extruding and spinning. The antistatic polyamide composition prepared by the preparation method not only has permanent antistatic property, but also has excellent mechanical properties and processability.