| abstract |
The invention discloses an oil-resistant low-smoke halogen-free flame-retardant flexible polyurethane cable material and a preparation method thereof, wherein a polyurethane prepolymer which has a certain molecular weight and isocyanate groups at two ends is synthesized by applying the reaction of polyol and polyisocyanate and controlling the R value to be 2.05-2.45. The isocyanate-terminated polyurethane prepolymer is mixed with white carbon black, a flame retardant and a mineral filler, and functional inorganic particles with polyurethane as a soft shell and the filler as a hard core are formed through physical dispersion and mechanochemical reaction. The hardness of the polyurethane cable material can be reduced, and the flexibility and the oil resistance of the polyurethane cable material can be improved. The cable material forms a multi-layer network structure through irradiation crosslinking and secondary vulcanization processes, so that the mechanical property of the material is improved, and the dimensional shrinkage rate of the material in the molding process is reduced. The oil-resistant low-smoke halogen-free flame-retardant flexible polyurethane cable material can be used for manufacturing low-smoke halogen-free flame-retardant cables, flexible special cables, insulation and sheaths of wires for new energy automobiles and Chinese standard motor train units. |