Weather-resistant crosslinked polyolefin composition, polyolefin sheet made from the same and method for making the sheet

摘要

A weather-resistant crosslinked polyolefin composition is a novel formula containing a comprehensive mixture constituted by crosslinking agent, antistatic agent, TiO2 sized in nanometer and TiO2 sized in micrometer and essential components including polyolefin composition resin, lubricant auxiliary crosslinking agent, antioxidant, UV absorber and filler etc; this novel formula is particularly suited to produce a weather-resistant crosslinked polyolefin sheet with a calender machine instead of an extruder conventionally used, and the polyolefin sheets produced thereof are excellent in both heat-resistant and weather-resistant as well as in a high-quality sheet surface and capably made at a high yield rate through the calender machine.

主权项

1. A weather-resistant crosslinked polyolefin composition, optionally processed by a calender machine to produce a weather-resistant crosslinked polyolefin sheet, comprising:
100 PHR (parts per hundred resin) of a polyolefin composition resin comprising:
20-50 PHR of polyethylene (PE),30-60 PHR of polypropylene (PP), and0.1-30 PHR of an ethylene-vinyl acetate (EVA) copolymer having a vinyl acetate (VA) content of 8-33%; 0.1-35 PHR of a mixture comprising, based on a total comprehensive mixture weight thereof, 0.1-3 wt % of a main crosslinking agent, 0.1-1.5 wt % of an antistatic agent, 0.1-1.5 wt % of TiO2 nanoparticles and 94-99.7 wt % of TiO2 microparticles; 0.01-2 PHR of an auxiliary crosslinking agent; 0.1-15 PHR of a lubricant; 0.1-5 PHR of an antioxidant; 0.1-3 PHR of a UV absorber; 0.1-30 PHR of a filler; and 0-35 PHR of a colorant.