Polyolefine resin composition having low specific density and high heat-resistance

摘要

PURPOSE: Provided are low density polyolefin resin compositions with high fire-resistance, which have improved fire resistance by compounding a compound of a nanostructure with an inorganic filler to high crystallinity polyolefin resin. CONSTITUTION: The polyolefin resin compositions include 65 to 90 wt% of high crystallinity polyolefin resin having an isotactic peptide fraction of at least 96%, 1 to 15 wt% of a nanostructure compound having -(Si2O3)4- unit, 1 to 10 wt% of modified polypropylene or modified polyolefin copolymer rubber grafted with unsaturated carbonic acid or its anhydride, and 5 to 20 wt% of talc having an average particle size of 1 to 10 micrometer. The high crystallinity polyolefin resin may be an isotactic polypropylene or a copolymer alpha olefine and propylene and have a flow index of 8 to 50/10min(ASTM D1238, 230 deg.C). The nanostructure compound have a chemical structure of the formula 1, in which R is methyl, phenethyl, isooctyl, cyclohexyl, cyclophenyl or isobutyl.