Method for preparing poly(arylene ether nitrile) resin powder

The invention discloses a method for preparing poly(arylene ether nitrile) resin powder, and belongs to the technical field of high polymer materials. 2,6-dichlorobenzonitrile and aromatic dihydric phenol are taken as raw materials, 1-methyl-2-Pyrrolidinone is taken as a solvent, anhydrous potassium carbonate or anhydrous sodium carbonate is taken as a catalyst, and methylbenzene or dimethylbenzene is taken as a dehydrating agent; and the method comprises the following steps of: performing reflux reaction at the temperature of between 130 and 160 DEG C for 2 to 4 hours in a reactor, slowly evaporating out water and the dehydrating agent, and raising the temperature to 180-200 DEG C until a macromolecular rod-climbing phenomenon happens; adding the solvent into the reactor, and diluting the reaction products to the mass concentration of 2 to 15 percent; and adding a precipitator into the reactor, continuously stirring, performing centrifugal solid-liquid separation, washing the solid in acidic boiling water, filtering and drying to obtain the poly(arylene ether nitrile) resin powder. The prepared poly(arylene ether nitrile) resin powder has the characteristics of superfine granularity (reaching 100-400 meshes), uniform granularity, high purity, stable performance, and excellent electrical property, and can be widely applied in the fields such as electronics, precision machines, aerospace, new energy and the like.