You Can Learn About Flame Retardants in Just A Few Minutes!

The way to realize flame retardation
Vapor flame retardancy mechanism. That is to inhibit the freedom of chain growth in the combustion reaction, and play the role of flame retardant.
Condensed phase mechanism of flame retardant. It prevents the thermal decomposition of the polymer in the solid phase and prevents the release of combustible gas from the polymer.
Heat transfer mechanism. It takes away the heat generated by the polymer and does not return it to the polymer so that it does not continuously break down.
Classification of flame retardants
According to the element types are divided into halide, organophosphorus and halogen - phosphorus, nitrogen, silicon, aluminum and magnesium, molybdenum, etc. According to the flame retardant effect, there are expansion flame retardant, carbon flame retardant and so on. According to the chemical structure of inorganic flame retardant, organic flame retardant, polymer flame retardant, etc. According to the relationship between flame retardants and flame retardant materials can be divided into additive flame retardants and reactive flame retardant agent, reactive flame retardant chemical reactions involved in polymer.
1 Halogenated flame retardant
Halogenated flame retardants are one of the largest organic flame retardants in the world. Halogenated flame retardants are mainly used in the electronics and construction industries, and about 50 to 100 halogenated flame retardants cover most of the market needs.
The reason why halogen flame retardants attract people's attention is that halogen flame retardants have high flame retardant efficiency and moderate price. The performance and price ratio of halogen flame retardants are difficult to be compared with other flame retardants. In addition, halogen flame retardants have many varieties and wide application range, so they are favored by people. However, halogen flame retardants are plagued by dioxin problems due to the formation of more smoke and corrosive gases during pyrolysis or combustion.
More than 80% of halogenated flame retardants are used in the electronics/office equipment and construction industries. The main applications are styrenes and their copolymers, thermoplastic engineering plastics and epoxy resins.
2 phosphorus flame retardants
Phosphorous compounds can be used as flame retardants in thermoplastics, thermosetting plastics, fabrics, paper, coatings and adhesives. Such flame retardants include red phosphorus, water-soluble inorganic phosphates, insoluble ammonium polyphosphate, organophosphate and phosphonate esters, phosphine oxide, hydrogen bomb alkyl phosphate esters and bromoaromatic phosphate esters.
Although halogen flame retardants have high flame retardancy, there are some problems such as environmental pollution and toxicity, while phosphorus flame retardants are very effective flame retardants except for several types of polymers such as styrene and polyolefin, and the secondary pollution is small, so the flame retardants have attracted people's attention.