Reasons that affect the flame retardancy of non-woven fabrics

The reasons why polyester wool has a flame retardant effect are as follows:

(1) The oxygen limiting index of conventional polyester wool is 20-22 (the oxygen concentration in the air is 21%), which is flammable A type of fiber that ignites easily but burns more slowly.

(2) If the polyester chip is modified and denatured, it will have a flame retardant effect. Most of the long-acting flame-retardant fibers use modified polyester chips to produce flame-retardant polyester wool. The main modifier is phosphorus series compounds. The use of phosphorus in high heat will combine with oxygen in the air to reduce the oxygen content. flame retardant effect.

(3) Another method to make polyester wool flame retardant is surface treatment. This kind of product thinks that the treatment agent will reduce the flame retardant effect after multiple processing.

(4) Polyester cotton has the characteristic of shrinking when it encounters high heat. When the fiber encounters a flame, it is not easily ignited due to shrinkage and is separated from the flame, resulting in an appropriate flame retardant effect.

(5) Polyester wool will melt and drip when it encounters high heat, and the melting and dripping phenomenon produced by polyester wool after ignition can also take away part of it.

Heat and flame to produce proper flame retardant effect.

(6) However, if the fibers are stained with grease that is easy to support combustion or use silicone oil that can set the shape of polyester wool, the polyester wool will reduce the flame retardant effect. In particular, when polyester wool containing SILICONE oil is exposed to flame, the fibers cannot shrink and burn.

(7) The method of increasing the flame retardancy of polyester wool. In addition to using flame-retardant modified polyester chips to produce polyester wool, the surface of the fiber is also post-treated with an oil with a high phosphate content. It can increase the flame retardant effect of the fiber. Because the phosphorus molecules released by the phosphates encounter high heat, they will combine with the oxygen molecules in the air and reduce the oxygen content in the air to increase the flame retardant properties.