The use of halogenated flame retardants in conjunction with phosphorus-containing flame retardants can produce significant synergies. For halogen-phos-phos-resisting synergies, it was suggested that halogen-phosphorus co-uses could facilitate mutual decomposition and result in the use of halogen-phosphorus compounds and their transformations, such as pbr3, pbr, pobr3, which had a stronger flame retardation effect than their own. Studies of halogen-phos-phosphate co-benefits using fissure gas chromatography, differential scanned heat analysis, oxygen index determination, flame retardants program warming observation indicate that the decomposition temperature of flame retardants when used in combination with halo-phosphorus is slightly lower than when used alone and is very severe, and that flue clouds formed from chlorophosphorus compounds and their hydrolysis products in the combustion zone can remain in the combustion zone for longer periods of time, forming a strong gas phase。
The mechanism for phosphorous-nitrogen interactions is not well studied and it is generally considered that phosphorylization of phosphate and cellulose can be facilitated with nitrogen compounds (e. G. Urine, melamine, thiram, melamine, hydromethyl melamine, etc.). Phosphate is more susceptible to ester reaction in cellulose, and thermal stability of this substance is better than that of phosphate. Phosphorus-nitrogen flame retardation systems promote the decomposition of sugar at lower temperatures into coke and water and increase the production of coke residues, thereby increasing the flame retardation effect. Phosphorus and nitrogen compounds form an inflated coke layer at high temperatures, acting as an insulation oxygen protection layer, and nitrogen-containing compounds act as blowing agents and coke boosters. Basic element analysis revealed that the residues contained nitrogen, phosphorus and oxygen, which formed thermal stability in an incorruptible form at flame temperatures, like glass, as an insulation shield for cellulose。
