Polyvinyl chloride cable sheath material for CMR-grade high-flame-retardant environment-friendly coaxial cable

Abstract

The invention relates to a polyvinyl chloride cable sheath material for a CMR-grade high-flame-retardant environment-friendly coaxial cable, which is mainly prepared from the following components in parts by weight: 100 parts of polyvinyl chloride, 15-20 parts of trioctyl trimellitate, 10-15 parts of triphosphate, 8-10 parts of dioctyl terephthalate, 8-10 parts of dioctyl phthalate, 4-5 parts of calcium / zinc composite stabilizer, 6-8 parts of epoxy soybean oil, 8-10 parts of antimony trioxide, 8-10 parts of zinc borate, 3-6 parts of glass fiber, 6-8 parts of aluminum hydroxide, 8-10 parts of ultrafine activated calcium carbonate and 1-2 parts of lubricant. The sheath provided by the invention has the advantages of high strength, favorable shell forming property and durability in the burning process, excellent flame retardancy and environmental protection, and especially can satisfy the design requirements for CMR-grade high-flame-retardant fine coaxial cables.

Description

(1) Technical field [0001] The invention relates to a wire and cable material, in particular to a polyvinyl chloride sheathing material for a CMR grade high flame-retardant environment-friendly coaxial cable. (2) Background technology [0002] The second-ranked CMR-rated coaxial cable has perfect flame resistance and is widely used in mainline applications where the ventilation system is physically separated from the wiring system. CMR-rated cables must undergo an intensive flame test: UL1666-"Test for flame propagation height of cables installed vertically through the middle". [0003] At present, the RG6 series CMR flame-retardant coaxial cable products have been successfully developed. In the patent ZL200820166233.9, an environmentally friendly CMR flame-retardant coaxial cable is introduced, which is a CMR flame-retardant coaxial cable of RG6 specification. The difficulty and key to the design of this cable lies in the development and selection of the sheath material. ...

AI Technical Summary

Problems solved by technology

[0005] Some domestic manufacturers use flame-retardant foam insulation instead of flammable insulation, which can meet the requirements of CMR flame-retardant, but the dielectric constant and dielectric loss of flame-retardant foam insulation become larger, which makes the attenuation larger and the transmission performance become worse

[0006] At the same time, because the thickness of the sheath of the micro-miniature coaxial cable is relatively thin, generally only about 0.3mm, the strength of the sheath is obviously insufficient. The tensile strength requirement of the RG6 specification sheath is ≥ 13.80MPa, while for the micro-type coaxial cable, it is proposed ≥ The requirement of 17.24MPa, and the uniformity and durability of its shell formation cannot be guaranteed during combustion, which also has a great impact on the final flame retardant effect

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