How does the flame retardant interrupt the burning of textiles?

Flame retardant is one of the fastest growing varieties of various materials. The purpose of the flame retardant is to make the non-flame retardant material have flame retardant properties, and it is not easy to burn or self-extinguish under certain conditions. With the continuous advancement of flame retardant technology, there are more and more types of flame retardants, and their performance has also been greatly improved. In addition to the flammability of polymer materials, there are many materials that require flame retardants for flame retardant, such as textiles. Today, Xiaobian wants to share with you how the flame retardant interrupts the burning of textiles.

The process of textile combustion (as a feedback mechanism) in which fuel (from thermal degradation or pyrolysis fibers), heat (from ignition and combustion), and oxygen (from air) act as main components . In order to interrupt the burning of textiles, five ways have been proposed. The flame retardant can function in one or more of these ways. The following are the various stages and associated flame retardant effects: a) heat removal; b) increasing decomposition temperature; c) reducing the formation of flammable volatiles, increasing the amount of char; d) reducing contact with oxygen or diluting the flame; Interfering with flame chemical reactions and/or increasing fuel ignition temperature (Tc); melting and/or degradation and/or dehydration requires absorption of large amounts of heat (eg, inorganic and organophosphorus containing formulations, aluminum hydroxide or water in the backcoat) Alumina). It is generally not used for flame retardants, but is more common in inherently refractory and heat resistant fibers such as aramid fibers. Most phosphorus- and nitrogen-containing flame retardants in cellulose and wool; heavy metal complexes in wool, hydrated and certain carbon-promoting flame retardants release water; halogen-containing flame retardants release hydrogen halide. A halogen-containing flame retardant, often combined with cerium oxide. As can be seen from the above, certain types of flame retardants can function in a variety of ways, as is the case with most effective examples. In addition, certain flame retardant formulations produce a liquid phase intermediate that wets the surface of the fiber and acts as a barrier to thermal and oxygen barriers – a widely accepted borate-boric acid mixture can be used in this manner. effect. In addition, it promotes char formation. To simplify the classification of the different ways of chemical flame retardant behavior, the terms ‘cohesive’ phase and ‘gas or vapor’ phase activity can be used to distinguish them. Both are compound items, the former including the above (a to c) modes, and the latter including (d) and (e) modes. The physical mechanisms usually work simultaneously, including the elimination of oxygen and/or heat by forming a coating (mode d), increasing the heat capacity (mode a), and diluting or covering the flame with a non-flammable gas (mode d).