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Plastic flame retardant essential: halogen-free flame retardant

Release time:

Jan 01,2021

[Summary]Plastic is flammable, but because of its good heat resistance, wear resistance, self-lubrication, low coefficient of friction, in electrical and electronic, automotive, machinery, aerospace and other industries have been used. And the thing that we address the flammability of plastics is flame retardants.

Plastic is flammable, but becauseIts good heat resistance, wear resistance, self-lubrication, low friction coefficient,InElectronic and electrical, automotive, mechanical, aerospace and other industriesare used.And we solveFlammability of plasticsThe thing isFlame retardant.

PreviouslyHalogen-containing polymers or flame retardant mixtures in combination with halogen-containing flame retardants are widely used in industry. However, in the event of a fire, halogen-containing flame retardant materials will produce a large amount of smoke and toxic corrosive hydrogen halide gas, causing secondary hazards. With the gradual upgrading of safety and environmental protection requirements, more and more applications require the use of halogen-free flame retardants. Today we come to know about halogen-free flame retardants.


our commonHalogen-free flame retardants include phosphorus-based flame retardants, silicon-based flame retardants, intumescent flame retardants, and inorganic flame retardants.

phosphorus flame retardantYesPhosphorus flame retardants include phosphate esters, phosphites, phosphate esters, and organic phosphorus salts, and most of them have the advantages of low smoke and non-toxicity.It isPhosphoric acid is used as a dehydrating agent and promotes char formation. Phosphoric acid absorbs heat, preventingCOoxidationCO2The heating process is reduced. The glass-like or liquid protective layer formed by the condensed phase can effectively reduce the oxygen diffusion and the heat and mass transfer between the gas phase and the solid phase, inhibit the carbon oxidation process, and reduce the thermal decomposition of the phosphorus-containing flame retardant.

Silicone flame retardantYesSilicone flame retardant is a new type of high efficiency, low toxicity, anti-dripping, environmentally friendly halogen-free flame retardant, but also a carbon type smoke suppression agent. The silicone flame retardant can improve the processability, heat resistance and the like of the substrate in addition to imparting excellent flame retardant properties to the substrate. The flame retardant mechanism of silicon flame retardants is mainly the migration barrier mechanism, that is, in the combustion process.,Silicone flame retardant migrates to the surface;Flame retardants themselves can be flame retardant and pass through the same.PCHomogeneous adiabatic charring after combustion(Si-C)Layer,To block the internal unburnedPCThe role of contact with external oxygen.

Intumescent flame retardant is a kind of compound flame retardant which is mainly composed of nitrogen and phosphorus. Because it expands when heated, it is called an intumescent flame retardant, which is an environmentally friendly flame retardant with high efficiency and low toxicity.Can

Inorganic flame retardants are composed of high temperature resistant solution added to ultrafine inorganic metal oxide fine processing. Inorganic flame retardant is mainly to have the essence of flame retardant inorganic elements in the form of elemental or compound added to the flame retardant substrate, in the physical dispersion state and polymer fully mixed, in the gas phase or condensed phase through chemical or physical changes to play a flame retardant effect. Inorganic flame retardants generally have low flame retardant efficiency and large addition amount, but they are less harmful and have good smoke suppression effect. Generally, it includes aluminum hydroxide, magnesium hydroxide, red phosphorus, etc.


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