flame retardantAlso known as flame retardant, fire retardant or fire retardant, it is widely used in all kinds of flammable materials, which can improve the safety of various materials and facilitate our daily life. There are many types of flame retardants, and there are special classification methods to classify them. Today, we will share with you the classification methods of the three flame retardants.

Classification of 1. by component

According to the different components can be divided into inorganic salt flame retardant, organic flame retardant and organic, inorganic mixed flame retardant three. Inorganic flame retardant is currently the most used type of flame retardant, its main component is inorganic, the main application products are aluminum hydroxide, magnesium hydroxide, ammonium phosphate, ammonium phosphate, ammonium chloride, boric acid and so on. The main components of organic flame retardants are organic compounds, and the main products are halogen, phosphate, and halogenated phosphate. There is also a part of organic flame retardants for the durability of textile fabrics flame retardant finishing, such as six bromine water dispersion, ten bromine-antimony trioxide flame retardant system, has a better resistance to washing flame retardant properties. Organic and inorganic mixed flame retardants are improved products of inorganic salt flame retardants, which mainly use water-insoluble organic phosphate ester water emulsion to partially replace inorganic salt flame retardants. Among the three types of flame retardants, inorganic flame retardants have the advantages of non-toxic, harmless, smokeless, and halogen-free. They are widely used in various fields. The total demand accounts for more than half of the total demand for flame retardants. There is a growing trend.

Classification of 2. by method of use

According to the different methods of use, flame retardants can be divided into additive type and reactive type. The additive flame retardant acts as a flame retardant mainly by adding a flame retardant to a combustible material. Reactive flame retardant is the introduction of flame retardant groups in polymer materials through chemical reactions, thereby improving the flame resistance of the material, and preventing the material from being ignited and inhibiting the spread of flame. Among the types of flame retardants, additive flame retardants dominate and are widely used, accounting for about 85% of flame retardants and only 15% of reactive flame retardants.

Classification of 3. by flame retardant elements

According to the flame retardant elements can be divided into halogen flame retardants, phosphorus flame retardants, nitrogen flame retardants, phosphorus-halogen flame retardants, phosphorus-nitrogen flame retardants and other categories. Halogen flame retardants in the pyrolysis process, the decomposition of the capture and transfer of combustion free radicals HX,HX can dilute the combustible gas generated when the combustible pyrolysis, cut off the combustible gas and air contact. Phosphorus-based flame retardants produce phosphoric anhydride or phosphoric acid during combustion, which promotes the dehydration and carbonization of combustibles and prevents or reduces the production of combustible gases. During pyrolysis, phosphoric anhydride also forms a glass-like melt covering the surface of combustibles, which promotes its oxidation to generate carbon dioxide and plays a flame retardant role.

In nitrogen-based flame retardants, nitrogen compounds and combustibles act to promote cross-linking into carbon, reduce the decomposition temperature of combustibles, produce non-combustible gases, and play a role in diluting combustible gases.

Phosphorus-halogen flame retardant, phosphorus-nitrogen flame retardant mainly through phosphorus-halogen, phosphorus-nitrogen synergistic effect to achieve the purpose of flame retardant, with phosphorus-halogen, phosphorus-nitrogen dual effect, flame retardant effect is better.