Preparation method of high-flame-retardant fireproof cable

Abstract

The invention discloses a preparation method of a high-flame-retardant fireproof cable. The preparation method comprises the following steps: 1) wire drawing and twisting of a wire core; 2) stranded wire insulation; (3) twisting the cable; (4) preparing an organic coating; (5) fireproof mud is extruded and coated; (6) re-preparing the organic coating; and 7) cable insulation. By optimizing the components and proportion of the fireproof mud, the flowability and adhesion of the fireproof mud are ensured; and the special organic coating is pre-coated on the surface of the cable, so that the bonding effect of the fireproof mud and the cable is improved, and meanwhile, moisture in the fireproof mud is prevented from permeating into the internal conductive cable. And a specific organic coating is further sprayed on the outer layer of the coated fireproof mud, so that evaporation of water is prevented, and cracking of the fireproof mud due to drying is avoided. In the insulation extrusion molding process of the cable containing the composite coating, small-angle reciprocating rotation is applied to the cable, the situation that the thicknesses of insulation layers on the upper surface and the lower surface of the cable are inconsistent due to gravity is avoided, and the eccentricity of the cable is reduced.

Description

technical field [0001] The invention belongs to the technical field of cables, and in particular relates to a preparation method of a high-flame-retardant fire-resistant cable. Background technique [0002] The main components of flame-retardant and fire-resistant cables are conductive cores, filling accessories, fire-proof mud, insulating sheaths, etc., and are mainly used in special environments such as high-rise buildings, coal mines, and oil exploration. When a fire occurs, the temperature of the flame can reach more than 800 ℃. It is difficult for ordinary plastic products to withstand such a high temperature, and the insulating sheath of the outer layer of the cable is easily burned. Therefore, the quality and effect of the fireproof mud layer in the cable plays an important role in the fireproofing of the cable. At present, the commonly used fireproof mud is magnesium hydroxide and sodium silicate, and the following problems are prone to occur during the extrusion co...

AI Technical Summary

Problems solved by technology

At present, the commonly used fireproofing mud components are magnesium hydroxide and sodium silicate, and the following problems are prone to occur during the extrusion process: 1) The moisture in the fireproofing mud penetrates into the interior, making the conductive cables work in a humid environment for a long time; 2) The adhesive force between the fire-proof mud and the inner cable is not strong, and it is easy to fall off; 3) The fluidity of the fire-proof mud is insufficient, and the application is uneven; 4) After the cable is coated with fire-proof mud, it cannot be left for too long, otherwise Easy to crack and fall off after drying and dehydration

If the fireproof mud is not evenly and completely wrapped on the surface of the cable, it will directly affect the flame retardant and fireproof effect

Due to the large wire diameter and specific gravity of the fireproof cable, when extruding the insulation layer, it is easy to cause the problem of uneven extrusion layer on the upper and lower sides of the cable due to gravity, which increases the eccentricity of the cable and affects its function.

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