TVP sheath for submarine cable and preparation method thereof

Abstract

The invention relates to a TVP sheath for a submarine cable and a preparation method thereof. The TVP sheath includes two foamed TVP protective layers which are welded to each other and a metal composite belt which is arranged between the two foamed TVP protective layers, wherein the foamed TVP protective layer includes the following components: in parts by weight, 65-70 parts of aluminum powder-doped EPDM, 15-25 parts of PP, 10-15 parts of toughening filler, 2-5 parts of a rosin soap foaming agent, 1-2 parts of a promoter DM, 0.3-2 parts of a promoter DPTT and 1-3 parts of a stabilizer, and the metal composite belt includes a metal substrate and an isocyanate-containing composite binder which is coated on both sides of the metal substrate. The aluminum powder-doped EPDM and PP are mixed,the toughening filler is then added, and the tensile strength, impact resistance, abrasion resistance and other performance of the protective layer can be improved significantly; the texture compactness of the protective layer can be improved significantly through combined use of the rosin soap foaming agent, the promoter DM and the promoter DPT, and the prepared TPV sheath has excellent tensile properties, impact resistance, abrasion resistance and water impermeability, and is a suitable sheath for the submarine cable.

Description

technical field [0001] The invention relates to the technical field of submarine cables, in particular to a TPV sheath for submarine cables and a preparation method thereof. Background technique [0002] Submarine cables are composed of internal wires and external protective materials. They are mainly used for power and communication transmission across seas and rivers. Modern submarine cables are made of optical fibers to transmit telephone and Internet signals. According to data records: British Telecom Company laid the world's first international commercial cable in the English Channel in 1850, and in the following 100 years, such long-distance submarine cables increased to dozens around the world. Submarine cables are mainly composed of submarine communication cables and submarine power cables. Submarine communication cables are communication transmission media. Due to relatively high requirements for confidentiality, they are usually expensive; while submarine power cab...

AI Technical Summary

Problems solved by technology

[0005] The seawater environment is mostly high-salt and high-corrosion. The above-mentioned PE sheath has excellent corrosion resistance. However, most submarine cables are subjected to high pressure in deep water, and the submarine environment is complex. The surface of the PE sheath may be mechanically damaged, and the seawater is easy to damage Penetrate into the submarine cable and affect the service life of the submarine cable