Polypropylene material with high melt strength and preparation method thereof

Abstract

The invention discloses a polypropylene material with high melt strength and a preparation method thereof. The polypropylene material with high melt strength is prepared from the following components in parts by weight through the manner of extrusion reaction grafting through an extruding machine: 100 parts of polypropylene, 1-4 parts of a cross-linking agent, 0.1-1 part of benzoyl peroxide paste and 0.1-1.5 parts of an antioxidant, wherein the fusion index of polypropylene is 6-15g/10min and the mass percent of benzoyl peroxide in the benzoyl peroxide paste is 50%-55%. According to the preparation method for the polypropylene material with high melt strength disclosed by the invention, three screw rods are adopted for rotating the extruding machine in a homodromous parallel manner. The melt strength of the polypropylene material with high melt strength produced according to the invention is 1.5-15 times that of the main component polypropylene; the polypropylene material has high heat resistance, excellent strain-hardening effect and mechanical properties; the structure can be controlled according to the requirement; the polypropylene material can be widely applied to the fields of polypropylene foaming and thermal forming.

Description

technical field [0001] The invention relates to a polypropylene material and a preparation method thereof, in particular to a high-melt strength polypropylene material and a preparation method thereof. Background technique [0002] As one of the five general-purpose thermoplastic resins, polypropylene (PP) is not only rich in raw materials and low in price, but also has the characteristics of high melting point, excellent heat resistance, excellent mechanical properties and easy molding and processing. It is used in transportation (automotive interior decoration and bumper) , hard packaging (bottle caps, trays, turnover boxes, etc.), equipment and medical products (syringes, tool boxes, etc.), food fast food boxes, industrial and agricultural and daily necessities and other fields have been widely used. [0003] Since the softening point of ordinary polypropylene is close to the melting temperature, the melt strength (melt viscosity) of PP will drop sharply during processing...

AI Technical Summary

Problems solved by technology

The Institute of Chemistry, Chinese Academy of Sciences has used DCP to initiate unsaturated silane grafting to prepare HMSPP, but the gel can only be obtained under the condition of high DCP and silane content at the same time, and the chemically crosslinked product has an unpleasant odor, which limits application

[0005] Chinese patent CN1142514A reported that Beijing Research Institute of Chemical Industry and Peking University passed 60 Gamma ray radiation polypropylene produced by Co produces high melt strength polypropylene, which is characterized in that a certain amount of nucleating agent is added to polypropylene to overcome the degradation of polypropylene in the radiation crosslinking process existing in the prior art and under normal temperature Disadvantages of no significant improvement in mechanical properties

Radiation modification of polypropylene generally requires vacuum or nitrogen protection to reduce the oxidative degradation reaction during the radiation process, and the processing environment brings great obstacles to industrial production

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