▎ 摘　　要

NOVELTY - Preparation of discontinuous fiber-reinforced polyhexahydrotriazine resin-based thermally-conductive composite material involves uniformly dissolving formaldehyde and an aromatic amine in a water/aprotic solvent mixed solution, stirring and reacting the resulting reaction solution at 30-100 degrees C for 5-120 minutes for prepolymerization to obtain a prepolymer solution, uniformly mixing a thermally-conductive filler and discontinuous with the prepolymer solution, adding a solvent for precipitation, filtering the precipitate, and drying to obtain a prepreg (A), or prepolymerizing a formaldehyde and an aromatic amine in a water/aprotic solvent mixed solution, adding a solvent for precipitation, drying the precipitate to obtain a prepolymer powder, uniformly mixing with the thermally-conductive filler and discontinuous fibers to obtain a prepreg (B), and curing prepreg (A) or (B) by heat and pressure. USE - Preparation of discontinuous fiber-reinforced polyhexahydrotriazine resin-based thermally-conductive composite material. ADVANTAGE - The method produces discontinuous fiber-reinforced polyhexahydrotriazine resin-based thermally-conductive composite material having excellent mechanical property and thermal-conductive property, by simple process. The composite material can be efficiently recycled and reused. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for recycle of the composite material, which involves soaking the composite material in 5-30 ml/g strong acid/aprotic solvent mixed solution at 20-95 degrees C for 0.5-24 hours, filtering fibers from the degraded acid solution through a screen, washing with water, alkali solution, and water, and drying to recover the fibers, filtering and degrading the acid solution using a quantitative filter paper, washing with water, alkali solution, and water, and drying to recover the thermally-conductive filler, neutralizing the degraded acid solution, precipitating, filtering, washing with water, and drying through an alkaline solution to obtain the aromatic amine.