SWELLING AT HIGH TEMPERATURES, FIRE-PROOFING WEBSAND COMPOUND SEALINGS FACED ON THREE SIDES FOR (GENERATOR) GAS IN PURIFIED AND COOLED DOWN AND NON-PURIFIED STATE

摘要

A coextruded, intumescent fire-protection strip comprises an intumescent composition and a three-sided jacket. A coextruded, intumescent fire-protection strip jacketed on three sides comprises: (a) an intumescent composition from (a1) a thermoplastic elastomer with a processing temperature of NOTGREATER 250 degrees C from class of block copolymers or uncrosslinked thermoplastic polyolefins; (a2) sulfuric-acid-treated graphite, (a3) flame retardant, and (a4) inorganic additive which forms an enamel or forms a ceramic; and (b) a three-sided jacket from (b1) thermoplastic elastomer with a processing temperature of NOTGREATER 250 degrees C form block copolymers or uncrosslinked thermoplastic polyolefins; (b2) flame retardant; and (b3) color pigment. An Independent claim is also included for a process for producing fire-protection strips comprising extruding the jacket (b) at NOTGREATER 250 degrees C by a single-screw extruder and simultaneously extruding the intumescent composition (a) at NOTGREATER 250 degrees C into the cavity of the jacket by a twin-screw extruder, and using a coextrusion die, composed of a composite head with conically oriented slot dies of various widths to obtain coextruded, intumescent fire-protection strips jacketed on three sides and having a width of 10-60 mm and a thickness of 1-5 mm, these being polished by a roller take-off system and then wound up.