Polypropylene foamed sheet and preparation method thereof

Abstract

The invention discloses a polypropylene foamed sheet and a preparation method thereof. The foamed sheet is prepared from raw materials in parts by weight as follows: 100 parts of polyolefin resin, 1-20 parts of a foaming agent, 0.01-10 parts of an assistant crosslinker, 0.15-2 parts of an antioxidant, 0-3 parts of color masterbatch, 1-20 parts of polyolefin elastomers and 0-10 parts of ethylene propylene diene monomer rubber. The method comprises steps as follows: firstly, prepared foamed masterbatch, antioxidant masterbatch, sensitized masterbatch and color masterbatch are mixed with the balance of polypropylene and polyethylene, the polyolefin elastomers and the ethylene propylene diene monomer rubber, a formed sheet is extruded by an extruder, and a foamed substrate is obtained; the foamed substrate is subjected to electronic irradiation crosslinking, and a foamed master sheet is obtained; finally, the foamed master sheet is subjected to free type foaming, and the foamed sheet is obtained. According to the polypropylene foamed sheet and the preparation method thereof, polypropylene with high melt strength and polyethylene are adopted as matrix resin raw materials, formation of appropriate bubble nuclei during growing of bubbles of the foamed sheet is facilitated through irradiation crosslinking, better machinability is realized, and the foamed sheet has good physical and mechanical properties at the high temperature and can meet machining requirements under various conditions.

Description

technical field

[0001] The invention relates to a polypropylene foam sheet, in particular to a polypropylene foam sheet and a preparation method thereof. Background technique

[0002] Compared with other polyolefins, polypropylene foam sheet has greater rigidity, higher strength than polyethylene, better temperature resistance, and better impact toughness than polystyrene. It has been considered as a Alternatives to other thermoplastic foam sheets in industrial applications. But polypropylene has some serious drawbacks that limit its use for making foamed sheets. In particular, many conventional polypropylenes have low melt strength and / or low melt extensibility, and at the same time, there is degradation and modification of the polypropylene base resin and a decrease in the mechanical properties of the polymer caused by the kneading of various polymers, and the Problems such as rising processing costs limit the application of foaming technology in the industry. Contents...

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