Propylene ethylene high melt strength polypropylene foam beads and preparation method thereof

Abstract

The invention provides a polypropylene foamed bead. The foamed bead is prepared by foaming a base resin high-melt-strength polypropylene with a foaming agent, wherein the high-melt-strength polypropylene has the following characteristics: the melt index MFR is 0.2-10 g / 10 minutes, the molecular weight distribution Mw / Mn is 6-20, the content of substances with the molecular weight of greater than 5 million is greater than or equal to 0.8 wt%, the M[z+1] / Mn is greater than or equal to 70, and the ethylene content is 0.1-20 wt%. The high-melt-strength polypropylene with wide molecular weight distribution is utilized as the raw material to implement stabilization of the polypropylene raw material, so that the foaming window is effectively enlarged, the technique is easy to adjust, and the cost is low; the method can be used for preparing the polypropylene foamed bead with the density of 0.02-0.3 g / cm<3>, which has the advantages of uniform pore diameter, compact pores, uniform pore size distribution and close-pore structure; and the polypropylene foamed bead can be widely used in the fields of thermal insulation tableware, automobile interior ornaments, architectural moldboards, camping supplies, decorating material interlayers, product damping packages and the like.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a propylene-ethylene high-melt-strength polypropylene foaming bead and a preparation method thereof. Background technique [0002] Traditional polymer foamed plastics mainly include soft and rigid foamed plastics such as polyurethane, polystyrene and polyethylene. Foamed polypropylene material is a polymer / gas composite material with excellent performance. With its unique and superior performance, it has become the fastest growing new environment-friendly anti-pressure buffer heat insulation material. Compared with traditional foamed materials, non-crosslinked polypropylene foamed materials (including foamed beads, foamed boards and sheets, etc.) have excellent mechanical properties and environmental protection properties: excellent heat resistance, the use temperature can be up to 130°C; the dimensional stability of the product at high temperature, the Vicat softening point can re...

AI Technical Summary

Problems solved by technology

But this method uses the high-energy electron beam cross-linking method to prepare foaming material, so this material can not be degraded naturally in the environment, can not be recycled when being used to make automotive interior materials such as car roof, door and instrument panel after the car is scrapped, will be harmful to environmental impact

U.S. Patent US6251319 (applied on April 30, 1999) discloses a method for preparing polypropylene foam sheet, using high melt strength polypropylene resin and volatile and flammable blowing agent butane, and the expansion ratio is 4-56 times, but due to the use of combustibles as foaming agents, equipment and corresponding workshops must undergo special explosion-proof treatment, so the cost of producing polypropylene foaming materials is relatively high

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