Common flame retardants for textiles
2021-05-14 16:53 | writer: admin
Flame retardant elements are also used in the third, fifth, sixth and seventh main groups of the periodic table, and in the compounds of magnesium, barium, zinc, tin, titanium, iron, zirconium and molybdenum. Flame retardants commonly used in textiles can be divided into the following three categories according to their elements:
1、 Halogen containing flame retardants: during pyrolysis, they are decomposed to capture and transfer combustion free radicals X and HX, which can dilute the combustible gas generated during fiber pyrolysis or block the contact with air.
2、 Phosphorus containing flame retardant: phosphoric anhydride is produced in the process of combustion, which promotes the dehydration and carbonization of textiles and prevents or reduces the generation of combustible gas. In addition, the glass like melt formed during the pyrolysis of phosphoric anhydride covered the fabric, which promoted its oxidation into carbon dioxide and played a flame retardant role.
3、 Nitrogen compounds can interact with cellulose, promote cross-linking to form carbon, reduce the decomposition temperature of fabric, produce non combustible gas, and dilute combustible gas.
In recent years, there are also some new flame retardant methods, such as nano flame retardant technology. Nano carbon black can be applied to polyester by melt blending method, which can effectively improve the flame retardancy of polyester. In addition, there are various new flame retardant technologies, such as microcapsule flame retardant, superfine, surface modification, macromolecular technology and so on. In the future, these flame retardant methods will be widely used in clothing, interior decoration, transportation, protection and industrial textiles.