The invention provides a preparation method and application of composite material tunnel cable trays. Steps: S1. Mix 90 parts of polyurethane polymer, 20‑30 parts of modified boron nitride nanosheets, 3‑7 parts of oxidized carbon fiber, 18‑28 parts of plasticizer, 5‑10 parts of compatibilizer, 1‑2 parts of antioxidant and 0.5‑1 part of lubricant thoroughly, then feed into an internal mixer for 8‑10 min at a rotor speed of 40 r/min and mixing temperature of 175‑180℃ to obtain mixed compound; S2. Extrude and pelletize the compound in a twin-screw extruder at 170‑185℃ to prepare composite pellets; S3. Melt the composite pellets in an injection molding machine at 175‑185℃, inject into a mold and cool to form finished tunnel cable trays. With polyurethane as the matrix, the composite material achieves excellent mechanical properties, high flame retardancy and high thermal conductivity.
Country Code: CN
Application Number: CN202411134990.8
