Gray antistatic polypropylene composite foamed beads with skin-core structure and molded products thereof

Abstract

The invention discloses a gray antistatic polypropylene composite foamed bead with a skin-core structure, which is composed of a foamed core layer and a non-foamed skin layer, and the foamed core layer is composed of polypropylene, a cell nucleating agent, and an antioxidant , colored carbon black and lubricant, and the cortex is composed of polypropylene, polyether block copolymer antistatic agent, maleic anhydride grafted modified polypropylene and multi-wall carbon nanotubes; the composite foamed beads are made of It is obtained by foaming in a high-pressure foaming tank after extruding and granulating with a co-extrusion extruder. The cortex layer contains compound antistatic agent and low melting point polypropylene, which ensures good fusion, apparent quality and stable permanent antistatic property of the molded product; the core layer has excellent foaming effect, which ensures that the foaming ratio of the molded product can be guaranteed. Tonality and excellent mechanical properties. Molded products not only have permanent antistatic properties, but also have good rigidity.

Description

technical field [0001] The invention belongs to the technical field of polymer material processing, and in particular relates to a gray antistatic polypropylene composite foaming bead with a skin-core structure and a molded product thereof. Background technique [0002] Expanded polypropylene beads (EPP) and its molded products have excellent mechanical properties, and are easier to recycle than traditional foamed materials. They play a pivotal role in the field of foamed plastics. EPP molded products have been used in packaging protection materials , Sound insulation and heat insulation materials, auto parts materials and other fields are widely used. [0003] Reducing the surface resistance of EPP materials is conducive to the concentration of electrons on the surface of evacuated materials, especially for packaging materials such as precision electronic equipment and liquid crystal displays, antistatic EPP materials are more needed. At present, antistatic EPP materials a...

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Problems solved by technology

At present, antistatic EPP materials are mainly realized in two ways. One is to add amphiphilic organic molecules, but its antistatic performance varies greatly with ambient humidity and temperature, and the surface resistance is generally only within 10 9-12 Ω; the second is to use conductive carbon black, graphite and carbon nanotubes as conductive active ingredients, although the surface resistance of such products can reach 10 5-10 Ω, but its addition is relatively large and the color is black, which weakens the foaming performance of EPP to a certain extent, and filling too much inorganic powder can easily lead to powder removal, and there is a risk of damaging the surface of electronic devices during transportation

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