The Synthetic Research Of Phosphorus-containing Flame Rerardants

With the advances of science and technology, the organic synthetic polymer materials are widely used in our lives and economic. Most of these materials are combustible or flammable under high temperature, and will give out large amounts of toxic and corrosive gas, leading to the pollution of the environment. Organic phosphated flame retardants turn out to be the focal material because of its non-toxic, halogen free, low smoke, high effectiveness, and good thermal stability. This paper designed and synthesized three new flame retardants containing phosphorus, triazine ring. This kind of flame retardant has good thermal stability, large molecular weight, non-volatile, highly flame retardance effect. The major experiment content and conclusion are as follows.(1) Synthesis is conducted by following the process of nonaphenyl1,3,5-triazine-2,4,6-triyltriphosphorimidate is:n(PCl3):n(melamine):n(phenol)=3:1:1, anhydrous MgCl2as catalyst, chlorobenzene as solvent and triethylamine as acid binding agent. TGA shows that the target molecule has high decomposition temperature, good thermal stability, preferably carbon-forming ability, and can be used as fire retardant in a variety of materialsuse.(2) Synthetic process of hexaphenyl1,3,5-triazine-2,4,6-triyltriphosphonate is:n (PCl3): n(phenol):n (methanol):n (cyanuric chloride)=1:2:1:3. After the three-step reaction can be obtained hexaphenyl1,3,5-triazine-2,4,6-triyltriphos phonate. Its decomposition temperature is>250℃, suitable prefere for the.flame retardance of common polymer materials, such as PP.(3) A new type of dendritic flame retardant is synthesized by cyanuric chloride, methanol and bisphenol A, which simultaneously contained two kinds of flame retardant element: nitrogen and phosphorus. TGA shows that the triazine dendrimers begins to decompose at251.2℃. After a rapid and massive weight loss, when the temperature reached500℃the mass decomposition almost finished. The product may be prefere for the.flame retardance of common polymer materials, such as PP.