Flame retardant is one of the more rapidly developing varieties of various material additives. The purpose of the existence of flame retardants is to make non-flame retardant materials with flame retardant properties, under certain conditions is not easy to burn or can be self-extinguishing. With the continuous progress of flame retardant technology, more and more types of flame retardants, their performance has also been substantially improved. In addition to polymer materials with flammable characteristics, there are many materials need flame retardants for flame retardant, such as textiles. Today, I want to share with you is what is the flame retardant interruption textile combustion flame retardant strategy.
In the process of textile combustion, fuel (from thermal degradation or pyrolysis of fibers), heat (from ignition and combustion) and oxygen (from air) all function as major components. In order to interrupt the combustion of textiles, five ways have been proposed. Flame retardants can act in one or more of these ways. The stages and associated flame retardant effects are listed below.
a) Removal of heat.
b) Increasing the decomposition temperature.
c) Reducing the formation of combustible volatiles and increasing the amount of char.
d) Reducing contact with oxygen or diluting the flame.
e) interfering with flame chemistry or increasing the fuel ignition temperature (Tc).
Melting, degradation, and dehydration require significant heat absorption (e.g., agents containing inorganic and organic phosphorus in the backcoat, aluminum hydroxide, or hydrated aluminum oxide). Not usually utilized by flame retardants; more common in inherently fire and heat resistant fibers (e.g., aromatic polyamide fibers). Most phosphorus- and nitrogen-containing flame retardants in cellulose and wool; heavy metal complexes in wool. Hydrated and certain carbon promoting flame retardants can release water; halogen-containing flame retardants can release hydrogen halides. Halogen-containing flame retardants, often combined with antimony oxide.
From the above, it can be seen that certain flame retardants can work in a variety of ways, and most effective examples are so. In addition, certain flame retardant agents can produce a liquid-phase intermediate that wets the fiber surface and thus acts as a barrier to insulation and oxygen - the widely accepted borate-boric acid mixture can function in this manner. In addition, it can promote carbon formation. To simplify the classification of the different modes of chemical flame retardant behavior, the terms 'condensed' phase and 'gas or vapor' phase activity can be used to distinguish them. Both are composite terms, the former including the above-mentioned (a to c) modalities and the latter including (d) and (e) modalities. Physical mechanisms usually work simultaneously, and these include the exclusion of oxygen or heat by forming a coating (mode d), increasing heat capacity (mode a), and diluting or covering the flame with non-flammable gases (mode d).
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