Halogen-free fire-retardant ethylene-vinyl acetate composite material and preparation method thereof

Abstract

The invention provides a halogen-free fire-retardant ethylene-vinyl acetate composite material and a preparation method thereof. The halogen-free fire-retardant ethylene-vinyl acetate composite material has good fire resistance and mechanical properties, does not contain halogens, is environmentally friendly, does not precipitate, has a light color and can be processed easily. The halogen-free fire-retardant ethylene-vinyl acetate composite material comprises 50 to 75wt% of ethylene-vinyl acetate, 12 to 24wt% of an organic phosphate, 6 to 10wt% of a melamine compound, 6 to 10wt% of a polyol, 0 to 4wt% of a polysiloxane, and 0.5 to 2wt% of a silazane coupling agent. Through compounding of the organic phosphate, the melamine compound and the polyol and combined utilization of the polysiloxane as an assistant fire retardant, the halogen-free fire-retardant ethylene-vinyl acetate composite material is prepared. The halogen-free fire-retardant ethylene-vinyl acetate composite material has obviously improved fire resistance and mechanical properties, does not contain halogens, is environmentally friendly, does not precipitate, has a light color and can be processed easily.

Description

technical field [0001] The invention relates to a flame-retardant composite material and a preparation method thereof, in particular to a halogen-free flame-retardant ethylene-vinyl acetate composite material and a preparation method thereof. Background technique [0002] Brominated flame-retardant ethylene-vinyl acetate (EVA) composites have good impact resistance and environmental stress crack resistance, and are widely used in wires and cables, flame-retardant electrical components and other fields. However, due to the restrictions on halogen flame retardants by environmental protection regulations, halogen-free flame-retardant EVA composites have received extensive attention in recent years. At present, halogen-free flame-retardant EVA composite materials are mainly prepared by adding flame retardants such as inorganic flame retardants magnesium hydroxide and aluminum hydroxide, ammonium polyphosphate, melamine cyanurate, and expanded graphite. These methods are describe...

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Problems solved by technology

[0008] The technologies disclosed in the above patents have the following deficiencies to varying degrees, which affect their use in various fields:

[0009] ①The flame retardant efficiency is low, the addition amount is large, it is difficult to disperse, and the processing is difficult, which seriously affects the mechanical properties of the prepared materials, such as magnesium hydroxide and aluminum hydroxide

[0010] ②Easy to absorb water, it will migrate to the surface of the material at room temperature, reducing the flame retardant effect and mechanical properties of the prepared material, such as ammonium polyphosphate

[0011] ③The flame retardant performance is poor, and there is a droplet phenomenon, so it can only be used in occasions with low flame retardant requirements, such as melamine cyanurate, etc.

[0012] ④The application of dark flame retardants limits the scope of use of products, such as expanded graphite, red phosphorus, etc.

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