Flame retardant method
According to the three elements of combustion and the characteristics of the combustion process, in order to achieve the purpose of fire prevention, it is necessary to control the decomposition of solid phase to reduce the generation of combustible gas to inhibit gas phase combustion and weaken the thermal energy of combustible gas. This is the purpose of all fire prevention technologies. Specific fireproofing methods can be divided into three methods: manufacturing fireproofing fibers, performing fireproofing finishing on fabrics, and combining fireproofing fibers and fireproofing finishing. 1. Manufacturing fire-proof fibers: The first is to improve the thermal stability of fiber-forming polymers; the second is to carry out fire-proof modification of raw filaments. 1. Improving the thermal stability of fiber-forming polymers (1) Introducing aromatic rings or heteroaromatic rings into the macromolecules of fiber-forming polymers to increase the rigidity of the chains, the density and cohesion of the macromolecules, thereby improving its thermal stability Sex, such as Nomex1313. (2) Through the cross-linking reaction between linear macromolecular chains in the fiber, it becomes a two-dimensional cross-linked structure, thereby preventing the carbon chain from breaking and becoming a fire-resistant fiber that does not shrink or melt, such as phenolic fiber. (3) The fiber stays in a high-temperature oxidation furnace for tens of minutes or several hours, causing the macromolecules to undergo oxidation, cyclization, deoxidation, carbonization and other reactions to become a conjugated system of ladder structure, thereby generating excellent high-temperature resistance. Fire-resistant fibers, such as polyacrylonitrile oxide chemical fibers. (4) The oxygen, nitrogen atoms and metal ions in the fiber macromolecules are chelated and cross-linked to form a stationary network structure, which improves thermal stability, causing the fiber macromolecules to be carbonized when heated and has excellent fire resistance, such as polyparaphenylene Diformyloxalylbiamidinehydrazone metal chelating fiber.
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