Tear-resistant series constant power electric heating cable

Abstract

The invention discloses a tear-resistant series constant power electric heating cable, which is characterized in that it comprises two sets of tinned copper conductors, and each set of tinned copper conductors is wrapped with a low-resistance transition layer and polyperfluoroethylene propylene in turn. Insulation layer, two sets of tinned copper conductors wrapped with a low-resistance transition layer and a polyperfluoroethylene propylene insulation layer are jointly wrapped with a PTC layer, and the PTC layer is wrapped with a tear-resistant mixed braid layer, and the tear-resistant The mixed braided layer is wrapped with a reinforced sheath layer, and a plurality of channels are opened in the axial direction in the reinforced sheath layer, and each channel is filled with a high-strength aramid yarn filling rope. The invention realizes effective compatibility with the polyperfluoroethylene propylene matrix, improves the mechanical stability of the finished sheath layer material, the method of the invention is innovative, and can achieve higher stability without adding a stabilizer Resistant strength, with significant progress, while achieving tear resistance in physical structure and chemical materials.

Description

technical field [0001] The invention relates to the field of cables, in particular to a tear-resistant serial constant-power electric heating cable. Background technique [0002] The creep resistance of PFEP is poor. The traditional method can be modified with some fillers to improve its strength and creep. The commonly used fillers are glass fiber, carbon fiber, graphite, etc., and its electrical properties are relatively high. Well, it is a very excellent electrical insulating material, its surface resistivity does not change even after being immersed in water for a long time, its thermal stability is also strong, the melting temperature is usually between 265-270 ° C, the resistance of F46 is The radiation is 10-100 times greater than that of PTFE, and it has excellent radiation resistance. The chemical properties of Teflon F46 are also very good, and it has excellent weather resistance, ultraviolet resistance, high temperature resistance and low temperature resistance; ...

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Problems solved by technology

[0003] The surface energy of Teflon F46 is extremely low, and it also has good surface non-stickiness and low friction coefficient. It can be used as an excellent release material. Solids with a large contact angle to water and low bonding ability are hard-to-stick materials. , It needs to be treated with surface corrosion resistance to have a certain adhesion. For example, it can be bonded to other materials after surface treatment with some special adhesives. Therefore, Teflon F46 is compatible with most raw material additives. If it is directly blended and extruded, the stability will be greatly reduced, and because of its good insulation, good flame retardancy, and low dielectric constant, it is inevitably used in cable sheath materials. Therefore, how to It is also the focus of current research to further improve its stability and strength and improve the protective effect of the sheath.

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