Expansion type environment-friendly halogen-free high-flame retardant and fire-resistant cable and method thereof

Abstract

The invention relates to an expansion type environment-friendly halogen-free high-flame retardant and fire-resistant cable and a method thereof. The cable is characterized in that: each core sequentially consists of conductors, a silicon rubber insulating layer, a filler, a flame retardant oxygen separation layer, an aluminum-plastic composite tape insulation layer and an expansion type fire-resistant outer protective layer made of low-smoke halogen-free flame retardant polyolefin from inside to outside, and adopts a fire-resistant cable structure formed by combining the expansion type fire-resistant outer protective layer made of the low-smoke halogen-free flame retardant polyolefin, the aluminum-plastic composite tape insulation layer and the silicon rubber insulating layer; and a flame retardant oxygen separation layer structure is formed by a halogen-free high-flame retardant material coated with metal hydrates. The preparation method comprises the following steps of: drawing single lines, performing annealing, twisting the conductors, insulating silicon rubber, cabling, and preparing the flame retardant oxygen separation layer, the aluminum-plastic composite tape insulation layer and the expansion type refractory outer protective layer made of the low-smoke halogen-free flame retardant polyolefin. The cable provided by the invention is easy to process, the external diameter of the cable is smaller than that of the traditional cable by 2 to 4 millimeters, and the structure can be obviously lightened.

Description

technical field [0001] The invention relates to a fire-resistant expansion type halogen-free high flame-retardant environmental protection cable and a method. The cable can be widely used in high-rise buildings, commercial residences, shopping malls, hospitals, power stations, subways, hotels and other places, and belongs to the field of cable technology. Background technique [0002] With the progress of society, the development of science and technology, and the requirements of human beings for the ecological environment, all countries are committed to the development of environmentally friendly cables. In recent years, the European Union has successively implemented green directives such as "WEEE Directive", "ROHS Directive" and "EUP Directive". It will be the development trend of wire and cable. [0003] However, the currently widely used flame-retardant cables are mainly PVC insulated and sheathed cables containing halogen flame-retardant systems, or low-smoke halogen-...

AI Technical Summary

Problems solved by technology

At the end of the 1990s, major polymer material manufacturers and related research institutions at home and abroad began research on low-smoke, halogen-free, flame-retardant polyolefin cable materials, vigorously developed halogen-free flame-retardant cable technology, and proposed a variety of flame-retardant materials. Low-smoke halogen-free flame-retardant polyolefin cable materials for flame-retardant systems, metal hydroxides [such as magnesium hydroxide Mg(OH) 2 , aluminum hydroxide Al(OH) 3 etc.] Low-smoke, halogen-free, flame-retardant polyolefin cables based on flame-retardant systems have rapidly been popularized and applied on a large scale, but so far, domestic understanding of low-smoke, halogen-free, and flame-retardant polyolefin cables is still limited Moisture gasification occurs under high temperature conditions to reduce the surface temperature of the material, thereby meeting the requirements of halogen-free flame retardant, but the halogen-free flame-retardant cable of the metal hydroxide flame-retardant system is easy to absorb moisture in the air, and is compatible with the matrix resin In order to obtain high flame retardant properties, a large amount of flame retardant fillers must be added. High fillers will inevitably lead to a significant decrease in the strength and elongation of the polymer, thus greatly affecting the mechanical, electrical and processing properties of the material.

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