What are the reasons that affect the flame retardancy of Flame retardant nonwoven for Filtration material
The reason why Flame retardant nonwoven for Filtration material has flame retardant effect is as follows:
(1) The oxygen limiting index of conventional Flame retardant nonwoven for Filtration material is 20-22 (the oxygen concentration in the air is 21%). It is a kind of combustible fiber, which is easy to ignite but burns slowly.
(2) If the polyester slices are modified and denatured, it will have a flame retardant effect. Most of the long-term flame-retardant fibers use denatured polyester chips to produce flame-retardant polyester cotton. The main modifier is phosphorus series compounds, which use phosphorus to combine with oxygen in the air under high heat to reduce the oxygen content. flame retardant effect.
(3) Another way to make Flame retardant nonwoven for Filtration material flame retardant is the surface treatment method. This kind of product thinks that the flame retardant effect will be reduced after repeated processing of the treatment agent.
(4) Flame retardant nonwoven for Filtration material has the characteristic of shrinking when encountering high heat. When the fiber encounters the flame, it shrinks and breaks away from the flame, which is not easy to ignite, and produces a proper flame retardant effect.
(5) Flame retardant nonwoven for Filtration material will melt and drip when it encounters high heat. The melting drip phenomenon produced by polyester cotton after ignition can also take away part of the heat and flame, and produce a proper flame retardant effect.
(6) However, if the fiber is stained with oil that is easy to support combustion or silicone oil that can shape the polyester cotton, the polyester cotton will reduce the flame-retardant effect. Especially when the polyester cotton containing SILICONE oil agent encounters a flame, the fiber cannot shrink and burn.
(7) The flame retardant method of increasing Flame retardant nonwoven for Filtration material, in addition to using flame retardant denatured polyester slices to produce polyester cotton, post-treating the fiber surface with an oil agent with a high phosphate content can also increase the fiber’s Flame retardant effect. Because the phosphorous molecules released by phosphate encounter high heat, they will combine with oxygen molecules in the air and reduce the oxygen content in the air at the same time, so as to increase the flame retardancy.