Full analysis of flame retardant composite materials for wires and cables

2023-11-20 13:59:46 admin 177

Rubber materials commonly used in the manufacture of wire and cable sheaths and insulation layers include ethylene-propylene rubber, ethylene-propylene diene rubber, chloroprene rubber, chlorinated polyethylene rubber, silicone rubber, natural rubber, styrene-butadiene rubber, etc.

For flame retardant treatment of these rubber cable materials, the method of adding organic halogen flame retardants or inorganic flame retardants can usually be used. Commonly used organic flame retardants are decachlorodicyclopentadiene and decabromodiphenyl ether, and antimony trioxide is generally added as a synergist. When the mass ratio of organohalogen flame retardant to antimony trioxide is between 2 1 and 5 1 , only 15 to 40 parts by mass of halogen flame retardant can achieve the flame retardant effect. Inorganic flame retardant systems mainly include aluminum hydroxide and magnesium hydroxide. To achieve a certain flame retardant effect, a large filling amount is required, which often reduces the mechanical and electrical properties of the vulcanized rubber. Phosphorus- and boron-based flame retardants and hydroxides can be used to reduce the amount of filler, or ultra-fine and surface-modified hydroxides can be used for filling.

In addition, by surface treatment of inorganic fillers (including inorganic flame retardants such as aluminum hydroxide) to improve the interfacial compatibility between rubber and inorganic mineral fillers, rubber cable materials with better overall performance can be obtained .

Recently, a novel fire-resistant and flame-retardant composite material , ceramic polyolefin , has gradually come into people's view and is more widely used in the wire and cable industry because of its excellent performance. The composition of ceramic polyolefin mainly includes polyolefin matrix, porcelain filler, flux, reinforcing agent and vulcanizing agent. Silicone rubber matrix, as the main component of ceramic silicone rubber, has the characteristics of linear organosiloxane polymer, with a relative molecular weight of hundreds of thousands or even millions, showing excellent insulation properties, aging resistance, and durability. Arc performance, ablation resistance, high and low temperature resistance, etc., can maintain its elasticity in the temperature range of -65 250 ℃. Its main chain is a Si-O-Si structure, and the side groups ( ) are organic groups such as methyl, ethyl, phenyl, and vinyl.

In short, due to the unique properties of ceramic polyolefin , it has gradually become an important material in the field of wires and cables. After the above detailed introduction, we believe that you have a deeper understanding of the composition and properties of ceramic polyolefin , and the application prospects of this material are also broader.
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Grindstone composite ceramic powder is a halogen-free, low-smoke, non-toxic, harmless and environmentally friendly flame-retardant composite material. After adding polymer, it can form a self-supporting ceramic body during low-temperature and short-term combustion, and has good physical strength. It has a fire-proof effect; under high temperature and long-term conditions or under flame, a ceramic body with higher strength can be formed, thereby better protecting the normal operation of internal components, not falling off when sprayed or vibrated, and having good heat insulation capabilities. , such as the normal power supply of wires and cables; in addition, it can also be used in products with strict flame retardant and fire protection requirements such as fire-resistant sealing strips, fire-resistant plastics and rubber, fire-resistant potting glue;