According to the relationship between the flame retardant and the flame-retardant substrate, the flame retardant can be divided into two types: additive type and reactive type. According to the type of flame retardant elements, flame retardants are often divided into halogen, organic phosphorus and halogen-phosphorus, nitrogen, phosphorus-nitrogen, antimony, aluminum-magnesium, inorganic phosphorus, boron, molybdenum, etc. . Can be divided into inorganic flame retardants and organic flame retardants.
Inorganic flame retardants include aluminum hydroxide, magnesium hydroxide, antimony flame retardants (such as antimony trioxide, colloidal antimony pentoxide, sodium antimonate, etc.), red phosphorus, ammonium polyphosphate, boron flame retardants ( Such as boric acid, borax, zinc borate, etc.), aluminum oxalate flame retardant, zinc sulfide-based flame retardant, etc.
Organic flame retardants include bromine-based flame retardants, chlorine-based flame retardants, organic phosphorus-based flame retardants (such as halogen-containing phosphate esters, halogen-containing phosphonate esters, cyclic phosphate esters, phosphine oxides, phosphorus-containing diols and Polyol, etc.), nitrogen-based flame retardants (such as melamine, melamine cyanide).