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 an ethane-1-butylene copolymer, the ratio of Mw of a room-temperature trichloro-benzenes soluble substance of high-melt strength high-impact polypropylene to Mw of a room-temperature trichloro-benzenes insoluble substance is greater than 0.5 and less or equal to 1; and the content of a room temperature xylene soluble substance is greater than 10 weight% and less than 30 weight%. 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 molded in-mold, in order to make the foam beads melt and bond to each other while the foam beads are foamed twice, it is necessary to use steam heating with a relatively high saturated vapor pressure, so that It is necessary to use a high-pressure metal mold and a high-pressure dedicated forming machine, which will lead to an increase in energy costs

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