| abstract |
(57) [Abstract] [PROBLEMS] To provide a method for producing a flame-retardant foamed crosslinked polyolefin insulated wire, which has excellent extrusion processability, high hardness, and excellent foaming stability. SOLUTION: The high density polyethylene (HDPE) having a density of 0.960 or more has a density of 0.91 and 75 to 95% by weight. Ultra low density polyethylene (VLDPE) of 5 or less is 25 to A silane grafter prepared by reacting 1 to 5 parts by weight of an organic unsaturated silane and 0.01 to 0.5 parts by weight of a free radical generator with respect to 100 parts by weight of a base polymer composed of 5% by weight. , A flame retardant masterbatch prepared by kneading a polyolefin, a halogen-based flame retardant, a flame retardant aid and a silanol condensation catalyst, and a pyrolytic foaming masterbatch and a silicone masterbatch are mixed and coated on a conductor by an extruder. A method for producing a flame-retardant foamed cross-linked polyolefin insulated wire, which comprises foaming and then contacting with water to cross-link. |