Explanation

It refers to the substance that can inhibit or slow down the combustion reaction of materials. According to the presence or absence of halogen elements, they can be divided into halogen series and halogen-free series, which also include phosphorus series, nitrogen series, phosphorus nitrogen expansion type, silicon series, inorganic series, etc; According to the usage method, it can generally be divided into two types: additive type and reactive type; According to composition, there are various kinds of inorganic and organic flame retardants. Most flame retardant or fire retardant achieve flame retardancy through multiple mechanisms. The general flame retardant mechanism can be summarized as: promoting the dehydration and carbonization of the substrate; After decomposition, a protective film is formed to isolate oxygen; The decomposition products capture free radicals or terminate the chain reaction of free radicals, making the flame unable to continue; Its decomposition products dilute combustible gases and absorb energy. It is mainly used for flame retardancy of synthetic macromolecule materials or natural polymer materials, including plastics, rubber, fibers, wood, paper, coatings, etc., and is widely used in building materials, aerospace materials, transportation facilities, electronics and electrical, household appliances and other fields.

Classification