Polypropylene toughening modifying agent and polypropylene modified product thereof

Abstract

The invention discloses a polypropylene toughening modifying agent and a polypropylene modified product thereof. The polypropylene toughening modifying agent comprises the following components: 15-50 wt percent of polyethylene, 15-50 wt percent of polypropylene, 20-55 wt percent of ethylene/octene copolymer (POE), 0.1-2.0 wt percent of initiator and 0.05-1.0 wt percent of antioxidant. A polypropylene modified pipe and an injection molding product which are produced by adopting the polypropylene toughening modifying agent are produced by the steps as follows: 2-15 wt percent of the polypropylene toughening modifying agent and 85-98 wt percent of polypropylene resin are physically mixed, a proper amount of coloring agent is added, the polypropylene modified pipe is extruded on a single-screw pipe extruder, and the polypropylene modified product is injected-molded on an injection molding machine. The polypropylene modified product has an impact strength which is increased by 28-34.5 percent, the melting temperature which is raised by 1.5-1.8 DEG C, and the crystallinity which is increased by 26.7-35.2 percent. According to the invention, the slow secondary crystallization of the polypropylene modified product in a post-stage storage process can be effectively reduced, and the residual internal stress of the polypropylene modified product is greatly eliminated.

Description

technical field [0001] The invention relates to a polypropylene toughening modifier and a polypropylene modified product thereof, belonging to the technical field of polypropylene and its products. Background technique [0002] Polypropylene (PP) is a polyolefin material with excellent performance. Its output and product volume rank second among general-purpose resins, and it is the product with the best heat resistance among general-purpose resins. , building materials and furniture have a wide range of applications. Polypropylene is sensitive to notch, has poor notched impact strength, and low temperature brittleness is particularly prominent. The usual method is to add ethylene-propylene-diene rubber (EPDM) and ethylene-octene copolymer (POE) to modify it to improve the notched impact strength of polypropylene. However, when the dosage reaches 10-12wt.%, the tensile strength of the modified material will be greatly lost. Random copolymerized polypropylene pipes (PPR pi...

AI Technical Summary

Problems solved by technology

[0003] Due to the high brittleness of PPR pipes at low temperatures (10 to -40°C), stress-induced cracking is very easy to occur, which has seriously affected the construction and installation of PPR pi...

Images