The invention relates to the field of conductive plastics, especially to a core mold material for grain column molding of rocket engines and its preparation method. The core mold material is composed of the following raw materials in parts by weight: 100 parts of plastic particles, 10‑25 parts of high-conductivity filler, 5‑15 parts of reinforcing filler, 0.05‑0.5 parts of coupling agent, 0.2‑0.8 parts of solid lubricant, 1‑5 parts of plasticizer and 0.2‑0.8 parts of antioxidant. By adopting high-efficiency hyperbranched lubricants with abundant terminal groups and three-dimensional spherical structures, uniform filler dispersion can be realized through only one-time twin-screw granulation. Meanwhile, the material improves surface smoothness and demolding performance of conductive plastics, facilitating subsequent extrusion and processing. Through matrix blending modification, high-conductivity fiber filling and formula optimization, the invention overcomes the defects of long processing cycle, high cost and complex technology of traditional alloy core molds.

Area Code: CN

Application Number: CN202111209586.9