Low-smoke halogen-free and flame-retardant mine cable
A mining and cable technology, applied in the direction of insulated cables, cables, circuits, etc., can solve problems such as disasters, human or animal suffocation, etc., and achieve the effects of improving performance, good roundness, and improving flame retardant efficiency.
Inactive Publication Date: 2016-02-10
JIANGSU ZHONGMEI CABLE
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Problems solved by technology
[0004] But when a fire occurs, although the PVC material mixed with plasticizer does not burn at high temperature, it will decompose hydrogen chloride gas, which will react with active hydroxyl groups in the sheath material and release a large amount of smoke and halogenated Hydrogen gas, with the increase in the use of flame retardants, the amount of flue gas it produces also increases, and the hydrogen chloride gas produced can easily suffocate people or animals, causing secondary disasters
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[0015] Such as figure 1 A low-smoke, halogen-free, flame-retardant mine cable is shown, including a cable core, which is formed by twisting three semi-conductive insulated wire cores and a ground core wire; There are intumescent flame-retardant strips 6 with solid catalysts; the carbon spheres formed during the combustion process have an in-situ strengthening effect on the carbon layer, thus improving the flame-retardant efficiency; based on the principle of in-situ formation of carbon spheres to strengthen the carbon layer, The carbon sphere precursor is introduced into the material system. On the one hand, it is used as a filler during processing and use to improve the mechanical properties of the material. On the other hand, it forms a carbon sphere reinforced carbon layer during the combustion process, which plays a role in improving the flame retardant efficiency; The cable core is extruded with a flame-retardant tape 7 with a thickness of 4-6mm, and the outermost layer o...
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Abstract
The invention discloses a low-smoke halogen-free and flame-retardant mine cable, which comprises a cable core, wherein the cable core is formed by twisting three semi-conductive insulated wire cores and a ground core wire; an expansible flame-retardant strip of introducing a solid catalyst is arranged in a gap of the cable core; a magnesium hydroxide flame-retardant tape which is 4-6mm thick is extruded outside the cable core; an EVA low-smoke halogen-free and flame-retardant outer sheath, which is 6-12mm thick, of introducing clay and solid acid is extruded on the outmost layer of the cable core; and the ratio of the cross section of each semi-conductive insulated wire core to the cross section of the ground core wire is 2 to 1. According to the low-smoke halogen-free and flame-retardant mine cable, the weight of the cable is reduced; the outer diameter is reduced; use of raw materials is reduced; and meanwhile, the operating characteristics of the cable are not changed.
Description
technical field [0001] The invention relates to the technical field of cables, in particular to a low-smoke, halogen-free, flame-retardant mine cable. Background technique [0002] At present, the mining cables used in China are required to have flame retardant properties. When a fire occurs in the mine, the cable with flame retardant function can ensure that the cable does not spread and protect the safety of personnel in the mine. In order to achieve the flame retardant function, the sheath material is usually made of polyvinyl chloride material, that is, to achieve this goal by adding halogenated flame retardants to these polymer materials or using halogen-containing polymer materials. However, cables used in mines should have good bending properties, and plasticizers are usually added to the sheath material to improve the softness of the material. [0003] Problems and shortcoming of existing technology: [0004] But when a fire occurs, although the PVC material mixed ...
Claims
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Inventor 刘景光李小琴肖颖
Owner JIANGSU ZHONGMEI CABLE