The Advantages and Disadvantages of Phosphate Flame Retardants

The advantages and disadvantages of phosphate flame retardants do you know? Commonly used organophosphorus flame retardants include tricresyl phosphate, triphenyl phosphate, tri(xylene) phosphate, butylbenzene phosphate, and propylbenzene phosphate. Phosphate esters are characterized by dual functions of flame retardant and plasticization. It can make the flame retardant halogen-free, and its plasticizing function can make the flow processability of plastics become better and can inhibit the residue after burning. There are fewer toxic gases and corrosive gases than halogenated flame retardants. Its main advantages are higher efficiency; less effect on light stability or light stabilizer effects; less corrosion during processing and combustion; and resistance to re-ignition; little or no increase in the quality of flame retardant materials. However, most of the phosphate flame retardants also have some disadvantages. Such as large volatility, poor heat resistance, compatibility is not ideal, but also in the combustion of dripping produce.

Phosphorus-containing inorganic flame retardants The main products are ammonium phosphate, red phosphorus flame retardant, ammonium polyphosphate and so on. With the increase in the amount of halogen-free flame retardant materials, the amount of red phosphorus flame retardant is also increasing. The flame-retardant effect of red phosphorus is better than that of phosphates. Phosphorus-containing inorganic flame retardants have been widely used due to their advantages such as non-volatile, non-thermal stability, long-lasting effect, corrosive gas generation, and low toxicity.
Phosphorus flame retardants function as flame retardants to promote dehydration and carbonization at the initial decomposition of the polymer. This dehydration step must rely on the oxygen-containing groups of the polymer itself and contain oxygen-containing polymers for its own structure. Their flame retardant effect will be better. In the case of polypropylene, because its molecular structure does not contain oxygen-containing groups, the flame-retardant effect of phosphorous flame retardants alone is not good, but if it is compounded with AL(OH)3 and Mg(OH)2, Can produce a synergistic effect, resulting in a good flame-retardant effect.