Cable with co-extruded self-foaming ceramic fireproof layer and preparation method thereof

By using ethylene-vinyl acetate copolymer and polyolefin elastomer matrix in cables, combined with ceramic precursor fillers, compatibilizers and toughening agents, a self-foaming ceramic fireproof layer is formed, which solves the problem of poor impact resistance of cables and realizes a high-strength, flame-retardant and heat-insulating cable structure.

CN121736401APending Publication Date: 2026-03-27GUANG DONG LI GUANG DIAN QI SHI YE YOU XIAN GONG SI
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Patent Information

Application Number
CN202512028036.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-12-16
Filing Date
2025-12-30
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Existing ceramicized polymer materials used in cables have problems such as poor impact resistance, poor compatibility, and easy cracking, which makes the protective structure of the cable easily damaged after mechanical impact or long-term aging.

Method used

Using ethylene-vinyl acetate copolymer and polyolefin elastomer as the matrix, ceramic precursor filler, compatibilizer and toughening agent are added, and a self-foaming ceramic fireproof layer is formed through co-extrusion process. The multifunctional groups of compatibilizer and the fiber network structure of toughening agent are used to enhance the adhesion and toughness of the material, and the foaming process is controlled to form a uniform and fine cell structure.

Benefits of technology

It improves the impact resistance and flame retardant properties of the cable, ensures that the fireproof layer transforms into a robust ceramic foam at high temperatures, enhances the mechanical strength and thermal insulation of the cable, prevents interlayer delamination, and simplifies the production process.

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Abstract

The invention discloses a cable with a co-extrusion self-foaming ceramic fireproof layer and a preparation method of the cable, and belongs to the technical field of polyolefin cables. The cable comprises a conductor, an insulating layer and a fireproof layer from inside to outside, comprising the following raw materials: 40-60 parts of an ethylene-vinyl acetate copolymer, 20-40 parts of a polyolefin elastomer, 20-30 parts of a ceramic precursor filler, 5-10 parts of a compatilizer, 5-10 parts of a cosolvent, 3-5 parts of a flexibilizer, 2-4 parts of a main foaming agent, 1-2 parts of an auxiliary foaming agent, 1-3 parts of a lubricant and 0.5-1.5 parts of an antioxidant. The compatilizer is siloxane containing sulfydryl and phosphaphenanthrene groups, and the flexibilizer is silane coupling agent modified quartz fibers containing double bonds. In a matrix of the ethylene-vinyl acetate copolymer and the polyolefin elastomer, the compatilizer and the flexibilizer are added, so that the fireproof layer is endowed with better impact resistance and flame retardance.
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