The smoke elimination mechanism of plastic

Many plastic when burnt, will produce a lot of smoke and toxic gases, which are often more dangerous factors in the fire. Because of smoke diffusion speed, low visibility and influence fire fighting work, toxic gases can cause great harm to human body and instrument. So while attaches great importance to the plastic flame retardant, smoke suppression processing must also, flame retardant and smoke elimination double make plastic to achieve.

use of flame retardant thermal decomposition reaction heat and the plastic required thermal degradation of the required heat of vaporization, lower the temperature of the plastic surface, to prevent thermal degradation reaction of plastic, textile production of combustible objects, so as to achieve flame retardant effect.

there are two main ways isolation membrane, is a kind of flame retardant is decomposed to produce heavy non-flammable gas or high boiling liquid and covering on the surface of the air, isolated from oxygen and fuel mutual diffusion. Another is the thermal decomposition of flame retardant plastic surface rapid dehydration and happen to carbonization, forming a layer of carbide layer and the carbide film is flame retardant isolation film.

the basic principle of plastic smoke elimination for inorganic smoke elimination agent in the resin, improve the interpretation of the polymer, inhibiting formation of carbon particles, and the formation of cokes, and smoke elimination can absorb toxic gases emitted by burning.

plastic additives commonly used in flame retardant formulation of the group is divided into flame retardants, and it is a kind of to prevent ignition or inhibit the spread of flame of plastic additives. Flame retardants is commonly used in injection molding processing and formula of additives, spill over its consumption after packing and plasticizer and become the third largest plastic additives varieties. There is a kind of classification method, namely the use method classification according to the flame retardant, it can be divided into adding flame retardant agent and reactive flame retardant agent two kinds big. Adding flame retardant and mean in front of the injection molding processing products production ingredients to add the category of flame retardants, it did not form with macromolecular chain reaction. Add flame retardant agent is to improve the deficiency of the flame retardant and at the same time, lost some intrinsic to the plastic performance.

reactive flame retardants is refers to the intramolecular reaction of functional groups, adding polymer in prepolymer can be bonded to the molecular main chain, become a part of the months purport, the category of flame retardants and flame retardant effect. Adding flame retardant and reactive flame retardants is not very clear boundaries, both generally reactive flame retardant agent can be used as additive flame retardants.

expansion type flame retardant is not a single flame retardants, its essence is a a composed of phosphorus and nitrogen and inorganic composite fire retardant system, it has good flame retardant effect, dripping and less smoke when burning and no toxic gases, will not affect the original plastic performance advantages, such as flame retardant is a kind of application prospect is very broad. For: expansion flame retardant mechanism of the flame retardant flame heating, can be in a uniform carbon foam plastic surface layer, have the effect of isolation from the heat and oxygen, so as to achieve flame retardant effect.

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