A kind of high oxygen index low smoke halogen free cable material and preparation method thereof

Abstract

The invention discloses a high oxygen index low smoke halogen free cable material and a preparation method thereof; the high oxygen index low smoke halogen free cable material comprises the following components in mass fraction: ethylene-vinyl acetate copolymer: 10% to 40%; Polyethylene resin: 5%-30%; inorganic flame retardant: 50%-60%; oxygen index synergist: 0.5-10%; organosilicon compound: 1%-2%; antioxidant 1%-2%. The oxygen index synergist used in the invention has a good synergistic effect with the flame retardant system of aluminum hydroxide flame retardant, and only 1% of the oxygen index synergist is added to the low-smoke halogen-free cable material, and the oxygen index of the cable material is sufficient When it reaches 44, adding 5% oxygen index synergist, the oxygen index can be rapidly increased to more than 50, and the efficiency of carbon crust formation of the cable material is accelerated during the combustion process, which effectively improves the flame retardancy of the low-smoke halogen-free cable material. Because of its small addition ratio, it has very little influence on the cost, mechanical properties and processability of the product, and has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of low-smoke halogen-free flame-retardant polyolefin cable materials, in particular to a high-oxygen index low-smoke halogen-free cable material and a preparation method thereof. Background technique [0002] Low-smoke halogen-free flame retardant polyolefin cable material is usually composed of polyolefin blend resin plus flame retardant filler aluminum hydroxide, magnesium hydroxide and some additives. Its flame retardant mechanism is that when burning, flame retardant filler Aluminum hydroxide and magnesium hydroxide will release crystal water and absorb a lot of heat. At the same time, the dehydration reaction will generate a lot of water vapor, which can dilute the flammable gas and prevent combustion. In addition, a non-melting and non-combustible oxide hard shell is formed on the surface of the material, which blocks the channel for the reaction between the polymer and the external thermal oxygen, and...

AI Technical Summary

Problems solved by technology

At present, the flame retardants used for low-smoke and halogen-free materials on the market are generally inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide. Although these flame retardants are low in price, they will not produce corrosive gases when burned, and have a smoke-suppressing effect. Good, does not produce harmful substances, etc., but the flame retardant effect of this kind of flame retardant is slow to form carbon crusts, and the oxygen index can only reach 37 / 38 when the mass fraction is 60%, which still cannot satisfy the oxygen index greater than 40 Requirements for high flame retardant products

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