Low-smoke halogen-free flame-retardant cable sheath material and preparation method thereof

Abstract

The invention provides a low-smoke halogen-free flame-retardant cable sheath material and a preparation method thereof. The cable sheath material is prepared from PE, chlorinated polyethylene, polybutylene terephthalate, antimonous oxide, zinc borate, modified carbon black, light magnesium oxide, hydroxy silicone oil, a plasticizer, a vulcanizing agent, a crosslinking agent and a stabilizer. The preparation method comprises the steps of mixing and grinding light magnesium oxide and hydroxy silicone oil to obtain modified magnesium oxide; soaking carbon black in a sodium hydroxide solution, taking out and drying carbon black, and mixing and grinding carbon black, a titanate coupling agent and microcrystal cellulose to obtain modified carbon black; and finally mixing PE, chlorinated polyethylene, polybutylene terephthalate, antimonous oxide, zinc borate, modified carbon black, modified magnesium oxide, the plasticizer, the vulcanizing agent, the crosslinking agent and the stabilizer, andthen vulcanizing the mixture on a flat-plate vulcanizing machine after mixing to obtain the cable sheath material. The obtained cable sheath material has a good mechanical property and a good flame retardant property.

Description

technical field [0001] The invention relates to a material for a cable sheath, in particular to a material for a low-smoke, halogen-free, flame-retardant cable sheath and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of the domestic economy and the acceleration of urbanization, as a basic public welfare facility to solve the problem of urban travel convenience, urban rail transit has been used in many Cities have been built on a large scale, and power cables have also been widely used. However, with the expansion of the number of applications, there have been a series of problems related to it, such as the installation and manufacture of cables and cable accessories, the breakdown of cable accessories, the retraction of cable insulation and outer sheath, etc., especially when laying on viaducts or The cracking of the outer sheath of the cable on the ground section is more prominent, which brings great pressure...

AI Technical Summary

Problems solved by technology

The PVC sheath material has good flame retardancy, but it will emit a large amount of hydrogen halide gas and dense smoke when it burns, causing "secondary hazards" of fire, which will cause great damage to human health and the environment, and cannot meet the requirements of low-smoke and halogen-free

Polyolefin or polyethylene is a flammable polymer halogen-free material. In order to achieve the flame retardant effect, a large amount of inorganic fuel retardant needs to be added, resulting in a significant decrease in the physical and mechanical properties of the sheath.