A flame-retardant silicone rubber for cables and its preparation method

By copolymerizing flame-retardant modified spiky hollow microspheres with silicone rubber to form a physical heat insulation and chemical flame-retardant layer, the problems of graphene dispersion and flame retardant migration are solved, achieving high-efficiency flame retardancy and long-term stability of cable materials and improving the overall performance of cables.

CN122302571APending Publication Date: 2026-06-30SHENZHEN ZHENGAN SLICONE MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN ZHENGAN SLICONE MATERIAL CO LTD
Filing Date
2026-05-11
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In existing technologies, graphene is difficult to disperse uniformly in silicone rubber, which makes it difficult to bring out its excellent properties. At the same time, existing flame retardants are prone to migration and precipitation, which cannot meet the requirements of high-efficiency flame retardancy and long-term stability of cable materials.

Method used

By copolymerizing methyl vinyl silicone rubber with flame-retardant modified spiky hollow microspheres, a physical heat insulation layer is formed using the hollow structure of inorganic high-temperature resistant ceramic material. A dense carbon layer is formed through phosphorus-nitrogen synergistic chemical flame retardancy to suppress flame spread. The flame-retardant modified spiky hollow microspheres are covalently grafted and fixed in the silicone rubber network.

Benefits of technology

It achieves long-term stability of flame retardant properties and lightweight design, improves the tensile strength, tear strength and impact resistance of composite materials, ensures the fire safety and electrical insulation performance of cables, and extends the service life of cables.

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Abstract

This invention discloses a flame-retardant silicone rubber for cables and its preparation method, belonging to the field of cable material technology. By copolymerizing methyl vinyl silicone rubber with flame-retardant modified spiky hollow microspheres, the flame-retardant modified spiky hollow microspheres can be fixed in the silicone rubber network. The flame-retardant modified spiky hollow microspheres themselves are inorganic high-temperature resistant ceramic materials. The hollow structure can form a physical heat insulation and oxygen barrier layer, blocking heat transfer and oxygen penetration, and delaying the thermal decomposition of the matrix. The grafted phosphorus-based flame-retardant groups and the nitrogen element of 4-aminobenzoic acid form a phosphorus-nitrogen synergistic chemical flame retardant. During combustion, a dense carbon layer is quickly generated, which inhibits flame spread, reduces heat release rate, and has excellent smoke suppression and toxicity reduction effects, meeting the stringent requirements for cable fire safety.
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