1, in accordance with the quantities of the flame retardant elements
In accordance with the quantities of the flame retardant flame retardant elements can be divided into phosphorus-containing flame retardants, phosphate flame retardants, nitrogen flame retardants, phosphate - halogen flame retardant, phosphorus - nitrogen flame retardants, such as a few classes. Phosphorus-containing flame retardants in the process of pyrolysis, the separating capture passing burning free radicals of X? And HX, HX can dilute combustible cracking when the flammable gas and combustible gas partition contact with the air. Phosphorus-containing flame retardant produced in the combustion process phosphoric acid anhydride or phosphoric acid, prompted combustible carbonized dehydration, reduce or prevent flammable gases. Phosphoric acid anhydride pyrolysis was formed in similar glassy surface of the molten material covered in the fuel, prompting them to oxidize to carbon dioxide, flame retardant effect. In nitrogen flame retarding agent, nitrogen compounds and combustible effect, promote the chain into carbon, reduce the decomposition temperature of fuel, non-flammable gas, have the effect of dilute combustible gas. Phosphorus - halogen flame retardant, phosphorus - nitrogen phosphorus flame retardants mainly through - halogen, phosphorus - nitrogen flame retardant synergistic effect to achieve, has the dual effect of phosphorus - halogen, phosphorus - nitrogen, flame retardant effect is better.
2, according to the composition of different points
According to the composition of different can be divided into organic flame retardants and inorganic flame retardants, organic and inorganic hybrid flame retardant 3 kinds. Inorganic flame retardant is currently the most used type of flame retardant, it is a major component of inorganic matter, its main application products are aluminum hydroxide, magnesium hydroxide, monoammonium phosphate, diammonium phosphate, ammonium chloride and boric acid. Organic flame retardant primary group is divided into organic matter, the main products are halogen series, phosphate, halogenated phosphate, etc. Part of this organic flame retardant used for the durable flame retardant finishing of textile fabric, such as the six bromine water medium, ten bromine - antimony trioxide flame retardant system, has good flame retardant properties of washing resistance. Organic and inorganic hybrid flame retardants are inorganic flame retardants modified products, the main use of water-soluble organic phosphate water emulsion, part instead of inorganic flame retardants. In three types of flame retardants and inorganic flame retardant is non-toxic and harmless, the advantages of smokeless, halogen free and widely used in various areas, the total demand accounted for more than half of the total demand of flame retardants and demand growth trend.
3, according to the method of use
According to the method of use can add flame retardants are divided into different type and reaction type. Mainly by adding flame retardant agent is added in the fuel flame retardant flame retardant role into full play. Reactive flame retardants are introduced through chemical reaction in polymer material flame retardant groups, so as to improve the flame resistance of materials, prevent the material from being ignited and curb the spread of flame. In the flame retardant type, adding flame retardant agent dominated, using range is wide, accounts for about 85% of the flame retardant, only 15% reactive flame retardant.
