Reasons for poor flame retardant effect of the hot

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Analysis of the reasons for the poor flame retardant effect of phosphorus flame retardants when used alone

phosphorus flame retardants play a flame retardant role in promoting the dehydration and carbonization of polymers during the initial decomposition. This dehydration and carbonization step must rely on the oxygen-containing group of the polymer itself. For the polymer with oxygen-containing group in its own structure. Their flame retardant effect will be better. For polypropylene, because its molecular structure has no oxygen-containing groups, the flame retardant effect is poor when phosphorus flame retardant is used alone, but if it is combined with (0h) 3 and Mg (OH) 2, it can produce synergistic effect, so as to obtain good flame retardant effect

commonly used organophosphorus flame retardants include triphenyl phosphate and trimethyl phosphate. As a new member of Solvay product family, phenyl ester, tri (xylene) phosphate, propyl benzene phosphate, butyl benzene phosphate, etc. Phosphates are characterized by their dual functions of flame retardancy and plasticization. It can make the flame retardant halogen-free, and its plasticizing function can improve the flow processability of plastic during molding, and inhibit the residue after combustion. It produces less toxic and corrosive gases than halogenated flame retardants. Its main advantage is high efficiency; It has little effect on photostability or the effect of light stabilizer; Low corrosion in processing and combustion; It has the effect of light weight and high strength to hinder the re ignition; Little or no increase in the quality of flame retardant materials. However, most phosphate flame retardants also have some disadvantages. Such as poor heat resistance, high volatility, poor compatibility, and dripping products during combustion

the main products of phosphorus containing inorganic flame retardants are red phosphorus flame retardants, ammonium phosphate, ammonium polyphosphate, etc. With the increase of 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 because of their good thermal stability, non-volatile, no production of corrosive gases when taking plastic parts out of the mold, long-lasting effect, low toxicity and other advantages

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