Photoelectric composite cable for underwater buoy, and preparation process therefor

By using a multi-layered structure and modified materials, the problems of wear resistance and water resistance of optical fiber composite cables have been solved, enabling efficient signal and power transmission in underwater environments. The cables also have self-healing capabilities, improving safety and reliability.

WO2025222701A1 Publication Date: 2025-10-30SHANGHAI QIFAN CABLE CO LTD
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Patent Information

Application Number
PCT/CN2024/113269
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-04-26
Filing Date
2024-08-20
Publication Date
2025-10-30

AI Technical Summary

Technical Problem

Existing optical fiber composite cables are prone to wear or aging during use, leading to conductor exposure, which poses a serious safety hazard, and their water resistance is insufficient.

Method used

It adopts a multi-layer structure design, including a cable core, a braided layer, a tensile reinforcement layer and an outer sheath. It is filled with water-blocking sealant. The outer sheath is composed of polyurethane, self-healing polyurethane prepolymer and composite nano zinc oxide. The wear resistance and water resistance are improved by modifying polysiloxane and nano zinc oxide. The multi-strand stranded structure and silver-plated copper wire stranding improve the vibration and impact resistance.

Benefits of technology

The abrasion resistance, water resistance and mechanical damage resistance of the optical-electric composite cable have been improved, ensuring good signal transmission capability and power supply in underwater environments. It also has self-healing function and reduced outer diameter and weight.

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Abstract

A photoelectric composite cable for an underwater buoy, and a preparation process therefor. A polyurethane, a self-repairing polyurethane prepolymer, and a composite nano zinc oxide are selected as an outer sheath base material. A modified polysiloxane having a B-O six-membered ring dynamic cross-linked network and a long-chain alkane group and an amino is introduced into the self-repairing polyurethane prepolymer; 5,5'-methylenedisalicylaldehyde and isophorone diisocyanate are together subjected to stepwise polymerization with the modified polysiloxane, and the 5,5'-methylenedisalicylaldehyde is cross-linked with diphenylmethane diisocyanate to obtain a self-repairing polyurethane prepolymer; and nano zinc oxide is subjected to a modification treatment, wherein dodecyltrimethoxysilane and 3-glycidoxypropyltrimethoxysilane are used for dual modification, such that super-hydrophobic nano zinc oxide having good thermal stability and high dispersity is prepared in a toluene system.
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