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Flame retardant PP pathway, mechanism and method

I, PP flame retardant ways mainly 3 ways to achieve 1, use Add-type flame retardant, through mechanical mixing in flame retardant flame retardant polymers, to flame retardant purposes. 2) using reactive flame retardants, namely flame retardant agent used as a reactive monomer response, grafted onto the polymer main chain or side chain, modified polymers flame retardant polymer itself has 3 flame retardant properties.

Second, the basic method of flame retardant

The basic methods of flame retardant included 1, foaming and non-foaming refractory coating PP material surface, isolating it from the oxygen or heat, 2, by modification or use a flame retardant masterbatch, achieves the PP base material has fire retardant

Three fire-retardant mechanism of 1 terminate the chain reaction mechanism, PP generally broken down into hydrocarbons during combustion. Hydrocarbon oxidation decomposition at high temperatures to further free radical chain reaction HO.HO flame burning continues, halide produced from the decomposition of hydrogen halides, (HX). HX can capture energy-HO, and x, and H2O and x. r and react with polymer HX and captures HO.. So you can make the HO. Reduce and eventually HO. Chain reaction led to cut off, terminate the combustion of hydrocarbons, achieve the purpose of flame retardant, PP, halide is usually used in chlorides or bromides instead of fluoride and iodide. Because fluoride is too lively, forms a fluorine molecule too lively, formation of fluorine molecules was very stable, iodine compounds of instability, it is rarely used