The phenomenon of continuous combustion of polymers actually requires relevant composition factors. That is: dye, heat and oxygen. The burning of the three missing is over. Black and white smoke is usually different from the smoke from burning plastic. Black smoke refers to the solid particles suspended in the combustion gas product under anoxic conditions; white smoke refers to small particles suspended in the air, such as steam condensate.aluminum hydroxideFlame retardants have a certain smoke suppression effect on soft polyvinyl chloride, but the mechanism of black smoke has a representative carbon double bond shrinkage mechanism, that is, gas polymerization to produce aromatic or polycyclic polymer compounds, and then shrinkage graphitization to produce carbon particles.

　　aluminum hydroxideThe anti-inflammatory effect of flame retardants, on the one hand, is due to the large surface area of aluminum oxide produced during the heating process, which can absorb tobacco cores and smoke particles to achieve smoke suppression effect. On the other hand, aluminum hydroxide suppresses the production of smoke because it promotes the carbonization process and replaces the soot formation process. Generally speaking, its smoke elimination effect may also be related to its dehydration and heat absorption during combustion.

Because in the coacervate phase, the dissipation of heat will reduce the pyrolysis and facilitate the cross-linking reaction. In addition, aluminum hydroxide can also absorb the acid gas hydrogen chloride produced by combustion, further reducing the amount of smoking. Under the same dosage of 50 percent, the performance test results of different particle size Al(OH)3/PVC flame retardant system. When pure PVC burns, when the same strip is ignited, it will burn rapidly, the burning area will continue to melt, the flame will become larger and larger, and the molten droplets will become more and more serious.

Andaluminum hydroxideThe addition of flame retardants also has great changes in performance, and the smoke during combustion changes greatly. With the decrease of particle size, the final fracture length increases, the dispersion increases, the amount of smoke decreases, and the self-extinguishing time shortens. The rod-like crystal Al(OH)3 has good horizontal tensile strength. Under the same particle size, due to the characteristics of the surface shape, the final fracture length of Al(OH)3 containing phosphate is higher under the same horizontal tension, and the extinguishing time is relatively fast due to the strong dehydration of phosphate.