Flame retardant principle of textile flame retardants

1.Override function

The covering function is to form a protective covering layer on the surface of the fiber. This The covering layer can be formed when the fiber is flame retardant, or when the flame retardant and flame retardant fiber are heated. Its function is to block the oxygen required for combustion propagation and capture the flammable volatile products generated by thermal decomposition of the fiber. When fusible carbonate or borate flame-retardant textiles are used, this covering effect is effective.

2. Heat dissipation

There are two ways to retard flames through heat dissipation：First of allis the heat transferred from the heat source to the textile through endothermic change (such as the melting of flame retardant and sublimation endothermic) consumption,Secondlyis to transfer heat from Guided away from the textile, both of which can prevent the textile from reaching the burning temperature.

3.Catalytic dehydration

The flame retardant effect of many flame retardants on cellulose is achieved through the catalytic dehydration mechanism. For example, the use of catalytic dehydration and flame retardant of cellulose can change the decomposition mode of cellulose. Thereby reducing the amount of tar and flammable gas generated by its cracking and increasing the amount of carbon. Moreover, compared with non-flame-retardant cotton fibers, the temperature at which catalytic dehydration occurs is lower in the former (275-325°C) and higher (about 375°C) in the latter. Both phosphoric acid and sulfuric acid are good dehydration catalysts for cellulose and are therefore effective flame retardants for cellulose. In addition, Lewis acid or dehydration of cellulose can also be used. At this time, cellulose is decomposed without generating L-glucose, thus a larger amount of carbon and a smaller amount of tar can be formed.

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