Heat-resisting oxygen aging polypropylene composition with low dispersity and preparation method of heat-resisting oxygen aging polypropylene composition

Abstract

The invention discloses a heat-resisting oxygen aging polypropylene composition with low dispersity and a preparation method of the heat-resisting oxygen aging polypropylene composition. The composition is prepared from the following raw materials by weight: 46-97% of polypropylene, 0-40% of inorganic filler, 0-10% of toughening agent, 1-3% of absorbent, 0.1-1% of antioxidant, 0.1-2% of other additives. The preparation method comprises the following steps: weighing the raw materials according to weight percentage, putting the raw materials into a high-speed mixer to dry-blend for 5-15 minutes, adding the mixed raw materials into a double-screw rod extruder, smelting and extruding, subsequently cooling and pelleting so as to prepare the polypropylene composition, wherein a first zone is 190-200 DEG C, a second zone is 200-210 DEG C, a third zone is 210-220 DEG C and a fourth zone is 205-215 DEG C, the retaining time in the whole extrusion process is 1-2 minutes, and the pressure is 12-18Mpa. The heat-resisting oxygen aging polypropylene composition has the advantages that low molecular weight compounds are effectively adsorbed and the dispersity is reduced as the additives are added into the polypropylene composition, acid substances, residual catalyst and the like in the composition are adsorbed and cleaned, so that the heat-resisting oxygen aging property is improved.

Description

technical field [0001] The invention relates to a low-emission heat-oxidative aging-resistant polypropylene composition and a preparation method thereof, more specifically, reducing the emission of the polypropylene composition by adding an adsorbent while improving its heat-oxidative aging resistance. It belongs to the field of polymer material modification and processing. Background technique [0002] Polypropylene is one of the five general-purpose plastics with low density (0.9g / cm 3 ), low price, chemical corrosion resistance and excellent processing performance, it has been widely used in the fields of automobiles, home appliances, construction and packaging. Because the polypropylene molecular chain contains unstable tertiary carbon atoms, it is easy to undergo chemical reactions under the action of heat and oxygen, making the surface of polypropylene products cracked and pulverized, and the mechanical properties are greatly reduced, so that the use value is complete...

AI Technical Summary

Problems solved by technology

Since the addition of grafting aids, compatibilizers, etc. has a great impact on the material's emission performance, its application is limited to a certain extent.

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