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...

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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 pipes for many years, and seriously affected the water delivery system of PPR pipes under low temperature conditions. Safety and people's daily production and living needs urgently require great effort to solve

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