Introduction of the principle of aramid flame retardant fabric

Compared with finishing flame retardant textiles, aramid fiber is a kind of textile which has flame retardant itself. Its flame retardant effect is durable, no odor, no damage caused by flame retardant finishing agent and processing aid. The residue causes the fabric to become brittle. Flame retardant fibers having flame retardant properties include aramid, aromatic heterocyclic polyamide, polybenzimidazole (PBI), polyparaphenylene benzobisoxazole (PBO), polyamide imide, Aromatic high temperature resistant flame retardant fiber such as polyphenylene sulfide (PPS) or polyarylsulfone amide (PSA); thermosetting three-dimensional crosslinked fiber such as melamine fiber or phenolic fiber; copolymerized modified nitrile chloride fiber and flame retardant Blended modified flame retardant viscose fiber, flame retardant vinylon, flame retardant polyester, flame retardant nylon, etc. Among them, the synthetic fiber modified by blended flame retardant such as flame-retardant polyester, flame-retardant nylon, and flame-retardant polypropylene has a droplet drop problem, so its application is limited. Flame-retardant viscose, flame-retardant vinylon and nitrile-chloride are not subject to droplets. The disadvantage of nitrile-chloride is that the strength is low and there is more smoke when burning. The international mainstream flame retardant products have the following two classic combinations: (1) Kermel fiber and flame retardant viscose blended with 50/50 blending ratio, which is the high temperature resistant flame retardant of European military and policemen. The main fabric of protective clothing; (2) Aramid 1313 pure fabric represented by Nomex or blended with flame retardant cotton fiber (65/35), is the main flame retardant fabric of the United States, Japan and other military. The PBI was developed by NASA in the United States and is used in heat-resistant and fireproof materials for aerospace sealed warehouses. Because of its high moisture regain, it has gradually developed flame retardant fabric materials for fire service, high temperature work clothes and flight suits. PBO's flame retardant performance is particularly good, and the strength reaches nearly 2 times that of aramid 1414, LOI reaches 68, and almost no smoke is generated after heating. Polysulfonamide is one of the flame retardant fibers researched and developed by China. Its heat resistance, flame retardancy, non-melting, electrical insulation and corrosion resistance can reach or close to Nomex fiber. In China, filter material and motor insulation Materials, flame retardant protective clothing and other aspects have been promoted and applied.