Halogen-free flame-retardant polypropylene foaming composite material and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, in particular to a halogen-free flame-retardant polypropylene foaming composite material and a preparation method thereof, and the halogen-free flame-retardant polypropylene foaming composite material comprises the following raw materials: polypropylene, melamine resin, maleic anhydride grafted ethylene-octylene copolymer and pentaerythritol polyphosphate melamine salt in a mass ratio of 100: (1-5): (5-10): (5-20). The preparation method comprises the following steps: mixing the raw materials, and carrying out melt blending and extrusion granulation to obtain an unfoamed composite material; and mixing the composite material with a foaming agent, and performing injection molding to obtain the composite material. According to the invention, a large number of amino groups contained in melamine resin react with anhydride groups of POE-g-MAH, a cross-linked network structure with melamine resin particles as the center is generated, the effect of enhancing the strength of polypropylene melt is achieved, the pore diameter of foam pores becomes smaller and is compact, and the prepared PP / POE-g-MAH / MF / MPP foam material is high in flame retardant efficiency, small and uniform in foam pore density, high in strength and toughness, and wide application prospect.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a halogen-free flame-retardant polypropylene foam composite material and a preparation method thereof. Background technique [0002] Microcellular foaming materials have the advantages of light weight, low heat transfer, good sound insulation and high specific strength. The main varieties are polyurethane, polystyrene and polyolefin foaming materials. The polyurethane foaming process will produce harmful isocyanate residues. The waste of expanded polystyrene products does not corrode, causing white pollution. PP foam material can be recycled, has high service temperature, low price, and excellent comprehensive performance. It is widely used in packaging, construction and auto parts and other fields. [0003] However, polypropylene is a crystalline polymer, and its foaming can only be near the melting point. When the processing temperature is above the melting point, th...

AI Technical Summary

Problems solved by technology

However, pentaerythritol polyphosphate melamine salt MPP contains a large number of polar groups, which has poor compatibility with non-polar polypropylene PP, which affects the dispersion effect of MPP in PP and the flame retardant efficiency.

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