Cross-linked syndiotactic polypropylene foam and preparation method and application thereof

Abstract

The invention provides cross-linked syndiotactic polypropylene foam and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing initiator master batches for crosslinking: extruding syndiotactic polypropylene and an initiator in a double-screw extruder to obtain the initiator master batches; (2) preparing cross-linked syndiotactic polypropylene: extruding the syndiotactic polypropylene, the initiator master batch and the cross-linking agent in a double-screw extruder to obtain the cross-linked syndiotactic polypropylene; and (3) preparing the cross-linked syndiotactic polypropylene foam: extruding and foaming the cross-linked syndiotactic polypropylene and the foaming agent master batch in a single-screw extruder to obtain the cross-linked syndiotactic polypropylene foam. The method can be used for preparing the low-rate cross-linked syndiotactic polypropylene foam with better mechanical properties, and can be applied to the fields of automotive trim, building material decoration, buffer interlayers and the like.

Description

technical field [0001] The invention relates to the technical field of plastic processing, more specifically, to a cross-linked syndiotactic polypropylene foam and its preparation method and application. Background technique [0002] Polypropylene is one of the five general-purpose plastics. It has the advantages of light weight, abundant raw material sources, high cost performance, good heat resistance, high thermal decomposition temperature, chemical corrosion resistance, wide processing temperature range, and easy recycling. It is the fastest-growing general-purpose thermoplastic resin in the world, and has broad application prospects. In 1958, after the discovery of stereoselective olefin polymerization, syndiotactic polypropylene was synthesized by Ziegler-Natta catalyst, but the stereoregularity of syndiotactic polypropylene synthesized by this catalyst was too low, resulting in its crystallinity and The melting temperature is too low and has no physical and chemical ...

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Problems solved by technology

[0003] Compared with polyurethane (PU), polystyrene (PS) and polyethylene (PE) foams, which are the most used at present, polypropylene foam has better heat resistance, and the service temperature can exceed 100°C. It has good mechanical properties and thermal insulation. Good performance, high impact energy absorption capacity, high resilience, stress crack resistance, non-toxic gas release when burning, recyclable, easier to degrade in the natural environment, environmentally friendly, good surface protection and sound insulation performance, etc., has a good reputation Application prospects, it has been widely used in cushioning packaging, food packaging, insulation, industrial applications, automobiles, construction, sports and leisure, agriculture and other fields, but polypropylene, as a highly crystalline plastic, has achieved There is almost no fluidity before the melting temperature, and the fluidity of the melt increases sharply after the melting temperature is exceeded. The melt strength is too low, making it easy to escape gas during foaming, resulting in a decrease in the expansion ratio or failure to foam

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