Thermoplastic low-fume halogen-free high-flame retardance polyolefin insulation material and preparation method thereof

Abstract

The invention provides a thermoplastic low-fume halogen-free high-flame retardance polyolefin insulation material and a preparation method thereof. The thermoplastic low-fume halogen-free high-flame retardance polyolefin insulation material comprises the following principal components in parts by weight: 30-40 parts of ethylene-vinyl acetate copolymer resin, 30-40 parts of polyolefine elastomer resin, 20-30 parts of polyethylene resin, 10-20 parts of compatilizers, 200-250 parts of hydrate fire retardants, 5-10 parts of charring agents, 1-2 parts of flame-retardant synergists, 0.5 parts of antioxidants A, 0.5 parts of antioxidant B and 5-10 parts of lubricants. The preparation method comprises the following steps of: preparing the materials contained in a raw material formula in parts by weight respectively, and then feeding the materials into a milling machine for uniform mixing; then feeding the mixture into an extruder to extrude cut granules; then screening through a vibrating screen; and finally cooling and packaging to obtain a finished product. The thermoplastic low-fume halogen-free high-flame retardance polyolefin insulation material provided by the invention has the advantages of better heat-resistant property and processing property and flame-retardant grade enhancement. The preparation method of the thermoplastic low-fume halogen-free high-flame retardance polyolefin insulation material, which is provided by the invention, is reasonable in design and easy and convenient to operate.

Description

technical field [0001] The invention relates to a cable material and a preparation method thereof, in particular to a thermoplastic low-smoke, halogen-free, highly flame-retardant polyolefin insulating material for building electric wires or indoor optical cables and a preparation method thereof. Background technique [0002] At present, flame-retardant PVC or nylon sheathed wires are mostly used for building wires or indoor optical cables. The flame-retardant PVC cable material has good flame retardancy, but it releases poisonous gas and dense smoke when burned, which is not conducive to escape and rescue. With the EU ROHS and REACH With the promulgation of environmental regulations and the needs of my country's public safety, the Ministry of Public Security has formulated standards that clearly require the use of low-smoke, halogen-free, flame-retardant polyolefin materials. [0003] The existing low-smoke halogen-free flame-retardant polyolefin insulation materials for bui...

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Problems solved by technology

[0002] At present, flame-retardant PVC or nylon sheathed wires are mostly used for building wires or indoor optical cables. The flame-retardant PVC cable material has good flame retardancy, but it releases poisonous gas and dense smoke when burned, which is not conducive to escape and rescue. With the EU ROHS and REACH With the promulgation of environmental regulations and the needs of public safety in my country, the Ministry of Public Security has formulated standards that clearly require the use of low-smoke, halogen-free, flame-retardant polyolefin materials

[0003] The existing low-smoke halogen-free flame-retardant polyolefin insulation materials for building wires and optical cables generally have the following disadvantages: 1. Poor flame retardancy. Generally, low-smoke and halogen-free materials cannot pass the IEC332 standard C-type bunching combustion test, and there is a current Fire hazard due to overloading

2. Insulating materials have poor heat resistance, large thermal deformation, and most of the deformation exceeds 50%.

3. The wear resistance is not good, and it is easy to scratch the insulation during the construction of the pipe, resulting in electrical breakdown and short circuit, causing fire

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