High-melt strength high-impact polypropylene foaming expanded beads and preparation method thereof

Abstract

The invention provides polypropylene foaming expanded beads and a preparation method thereof. The foaming expanded beads take high-melt strength high-impact polypropylene as a basic resin, and are prepared by foamed impregnation; wherein, the high-melt strength high-impact polypropylene comprise a propylene homopolymer component and a propylene-ethene copolymer component, molecular weight distribution ratio of Mw to Mn is less than or equal to 10 and greater than or equal to 4; the ratio of Mz+1 to Mw is greater than 10 and less than 20; the content of a room temperature xylene soluble substance is greater than 10 weight% and less than 30 weight%; and the ratio of Mw of a room-temperature trichloro-benzenes soluble substance to Mw of a room-temperature trichloro-benzenes insoluble substance is greater than 0.4 and less or equal to 1 The polypropylene foaming expanded beads have the advantages of uniform size and distribution of foaming pore and aperture, high percentage of close area, good high / low temperature high-impact performance, and high melt-strength; and can be widely used for the fields of automobile part, food, electronic package and building decoration; the preparation method is simple, operation is easy, and the cost is low.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to high-melt-strength impact-resistant polypropylene foam beads and a preparation method thereof. Background technique [0002] Due to its light weight, good mechanical properties, and the use of molding to produce products with specific shapes, polypropylene foam beads have become a polymer foam material with a wide range of uses. The focus of attention of the world and academia. [0003] Compared with polystyrene series resin foamed bead shaped products, polypropylene foamed molded products obtained by molding polypropylene foamed beads have good corrosion resistance, toughness, heat resistance and compression resilience. and other excellent performance. However, polypropylene has poor low temperature impact resistance, especially propylene homopolymer. After process adjustment, impact polypropylene can be prepared. Impact polypropylene has excellent high and low temperature i...

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Problems solved by technology

[0006] Although the homopolypropylene or random copolymerized polypropylene prepared according to the method reported in the above patent literature has high melt strength, its rigidity, toughness or impact resistance are insufficient, so the polypropylene material prepared based on this polypropylene material The performance and application of propylene foamed beads are still limited

[0007] Moreover, when the polypropylene foam beads are in-molded, in order to melt the foam beads to each other, it must be heated with water vapor with a relatively high saturated vapor pressure, so it is necessary to use a metal mold with high pressure resistance and a special tool for high stamping. Forming machines, resulting in higher energy costs

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