Flame-retardant antistatic polypropylene composition and expanded beads prepared therefrom

Abstract

The invention mainly provides a flame retardant polypropylene composition, a flame retardant antistatic polypropylene composition, and a flame retardant (antistatic) polypropylene foamed bead, and a preparation method and applications thereof. The flame retardant antistatic polypropylene foamed bead is prepared from the flame retardant antistatic polypropylene composition, which comprises polypropylene basic resin with a high melt strength, the flame retardant antistatic composition, a cellular nucleating agent, and optionally selected auxiliary agents such as antioxidant, by a foaming technology, and preferably, the polypropylene basic resin comprises a random copolymerization polypropylene continuous phase and a propylene-ethylene copolymer rubber dispersion phase. A moulded body prepared from the flame retardant antistatic polypropylene foamed bead has a good flame retardant and antistatic performance, excellent mechanical properties, and a wide application range.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a flame-retardant polypropylene composition, a flame-retardant antistatic polypropylene composition and a flame-retardant (antistatic) polypropylene foamed bead. Background technique [0002] Due to its light weight, good mechanical properties, and the use of molding to make products with specific shapes, expanded polypropylene beads (EPP) are a polymer foam material with a wide range of uses. Its development and industrial production have been continuously It is the focus of industry and academia in various countries. Compared with polystyrene series resin foamed bead shaped products, polypropylene foamed molded products obtained by molding polypropylene foamed beads have chemical resistance, high toughness, high heat resistance, good Excellent properties such as compression resilience. However, the current industrialized EPP has disadvantages such as high molding proce...

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Problems solved by technology

[0006] Third, EPP beads have poor antistatic properties

However, in general, the filling amount of conductive filler required to form a conductive network or the amount of antistatic agent added is relatively large, resulting in a significant decrease in the mechanical properties of the polymer, and increasing the production cost and process difficulty of the material. Therefore, Reducing the amount of conductive filler is an important content in the development and application of antistatic composite materials

Chinese patent application 200510004023.0 reports the use of polymer antistatic agents to prepare antistatic polyolefin resin foams, with a surface intrinsic resistivity of 10 8 -10 13 Ωcm, the polymer antistatic agent used mainly includes polyether-polypropylene block copolymer, polyether ester amide and polyamide mixture, etc., but the antistatic addition is 4-6%, and it is short-acting Antistatic agent, the antistatic validity period is only 30 days

Chinese patent application 200710192215.8 reports the preparation method of antistatic and anticonductive polypropylene, and the surface intrinsic resistivity of the obtained polypropylene sheet is 10 10 -10 11 Ωcm, the addition amount of carbon black is 5-40%; due to the low apparent density of carbon black, the addition amount is relatively large, it is difficult to blend with polypropylene base resin, which increases the complexity of the process and product cost

[0008] The most important thing is that when the flame retardant and long-acting antistatic agent are added to the polypropylene beads, the cell structure and expansion ratio of the EPP expanded beads will be significantly affected, and the quality of the subsequent molded products will be difficult. guaranteed, thereby limiting its field of application

When flame retardant and antistatic agent are added at the same time, it will often cause the flame retardant or antistatic performance of each other to decrease at the same time

[0009] Fourth, the low temperature impact resistance of polypropylene is poor, especially propylene homopolymer

Due to the low melt strength of traditional general-purpose impact polypropylene, when it is used for the preparation of foamed beads, there are problems such as cell merger and rupture, poor molding ability, etc.

[0010] The common way to increase the melt strength of polypropylene is to reduce the melt index, that is, to increase the molecular weight of polypropylene, but this will cause difficulties in material melting and extrusion

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