What kinds of common flame retardants are there?

1. Chlorine flame retardant








Recently, chloro flame retardants have been partly replaced by brominated flame retardants, and the consumption of chlorine based flame retardants has decreased.








2. Brominated flame retardants








3. Phosphorus flame retardant








Phosphorus based flame retardants include inorganic phosphorus flame retardants and organic phosphorus flame retardants.








4. Nitrogen flame retardant








Melamine, melamine cyanurate (MCA) and so on are commonly used. Synergists are often used in PA, PU, Po, pet, PS, PVC and other resins. Nitrogen / phosphorus is the most commonly used synergistic flame retardant system.








5. Intumescent flame retardant








6. Inorganic hydroxide flame retardant








Flame retardant is a functional assistant that gives flammability to flammable polymers. It is mainly designed for the flame retardancy of polymer materials. There are many types of flame retardants, which can be divided into additive flame retardant and reactive flame retardant according to the use method.








Additive flame retardants are added to the polymer by mechanical mixing method to make the polymer have flame retardancy. At present, the additive flame retardants mainly include organic flame retardant and inorganic flame retardant, halogenated flame retardant (organic chloride and organic bromide) and non halogen. Organic flame retardants are represented by bromine series, phosphorus nitrogen series, nitrogen series, red phosphorus and compounds, while inorganic ones are mainly antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon series and other flame retardant systems.








Reactive flame retardant takes part in the polymerization reaction as a monomer, so the polymer itself contains flame retardant components. Its advantage is that it has little impact on the performance of polymer materials, and the flame retardant is durable.