Flame retardant effect of flame retardant

 Flame retardant effect of flame retardant

The combustion of a polymer is a very intense and complex thermal oxidation reaction, characterized by smoke or fiery flame. General process of combustion is under the external heat source of heat, polymer with oxygen free radical chain degradation reaction in the air, produce volatile fuel, when the content reaches a certain concentration and temperature will be burning up, burning the released heat supply is part of the degradation of polymers, intensifying its degradation, produce more of the combustible gas, the flame in a very short period of time will spread rapidly and cause a fire.

Flame retardant is a kind of auxiliary agent which can prevent plastic from burning or suppressing the spread of flame. According to its usage, it can be divided into two categories: adding type and reactive type. Additive flame retardants are used in plastics in the process of processing and are used in thermoplastic plastics. Reactive flame retardants is as monomers in the process of polymer synthesis, chemically bonded to the polymer molecular chain for thermosetting plastics, some reactive flame retardant agent also can be used as additive flame retardants.

According to the chemical structure, the flame retardant can be divided into two categories: inorganic and organic, which contain halogen and phosphorus, and some contain antimony, boron and aluminum.

Flame retardant effect of flame retardant. The flame retardant of flame retardants is the speed that can prevent or inhibit its physical or chemical changes during the combustion of polymer materials. Specifically, these functions are reflected in the following aspects.

Flame retardant flame retardant effect (1) the endothermic effect of its action is difficult in the temperature rise of polymer materials, for example, borax has ten crystallization water molecules, due to release the crystallization water to seize 141.8 kJ/mol, quantity of heat, because of its heat and make the material temperature rise is suppressed, resulting in a flame retardant effect. The flame retardant effect of hydrated alumina is also due to the thermal absorption effect of thermal dewatering. In addition, some pyrolytic droplets of thermoplastic polymeric pyrolysis can be used to remove the heat of reaction from the combustion zone, and can also play a certain flame retardant effect.



Triphenyl Phosphate (TPP)

Flame retardant tpp This product has good transparency , flexibility and good benefits antimicrobial resistance, with water, oil, electrical insulation and compatibility. Mainly for the cellulose resin, a vinyl resin, natural rubber and synthetic rubber flame retardant plasticizers may also be used for acetate and glycerol triacetate film thin , rigid polyurethane foam , phenolic resin, and engineering plastics such as resistance PPO burning plasticized . Flame Retardant tpp manufacturer price mainly in Jiangsu .

Flame retardant TPP has many advantages, such as excellent transparency, softness, bacterial resistance, and water proof, grease-proof, good electric insulation, as well as good compatibility. Flame retardant TPP is mainly used as the flame-retardant plasticizer for cellulose resin, vinyl resin, natural rubber and synthetic rubber. And it may also be used as the flame-retardant plasticizer for glyceryl triacetate thin ester and film, rigid polyurethane foam, phenolic aldehyde resin, and PPO, etc.

Flame retardant TPP is a kind of halogen-free environment-friendly flame retardant with phosphorus element. Most of the products in the market are self-colored flaky crystal, our product is self-colored crystalline powder, and is more soluble in organic solvents. TPP is not soluble in water, but soluble in benzene, chloroform, ether and acetone, and slightly soluble in Z alcohol. Flame retardant TPP is nonflammable with slight aromatic odor and slight deliquescence. The fusion point is about 50 ℃, and fast melts to hoop-shape when heated. The lubricate effect is excellent, and it is often used as the flame retardant plasticize lubricant. What is more, it is used as the flame retardant for many plastics and resins, such as phenolic aldehyde resin, epoxy resin and so on.


Flame retardant flame retardant effect (2) the cover effect of its action is generated under high temperature stable coating, or broken down to generate foam material, covering on the surface of the polymer material, the combustion heat to the incoming material, high polymer material generated by pyrolysis of combustible gas is difficult to escape, and the material, the effect was isolated from air, thus inhibiting material cracking, to achieve the effect of flame retardant. Such as phosphate ester compounds and fire retardant coating can be applied to this mechanism.

Flame retardant flame retardant effect (3) the dilution effect of such matter in thermal decomposition can produce a large number of non-combustible gases, polymer materials produced by the combustible gas and oxygen in the air dilution and short of combustible concentration range, so as to prevent ignition combustion of polymer materials. It can be used as a dilute gas with CO2, NH3, HCl and H2O. Such non-flammable gases can be produced when they are heated, such as phosphoric acid amine, chlorinated amine and carbonamide.

The effect of flame retardant effect (4) is to change the thermal decomposition mode of high polymer materials, thus inhibiting the production of flammable gases. For example, acid or alkali is used to cause cellulose to be dehydrated and decomposed into carbon and water, which do not produce flammable gases and cannot burn. This kind of material can be decomposed by chlorinated amine, phosphine and phosphatate, and the catalytic material is condensed and carbonized.

Flame retardant effect of flame retardant (capture free radicals), (5) the inhibition effect of polymer combustion is primarily a free radical chain reaction, some material can capture the activity of combustion reaction intermediates, HO, h. o., HOO, etc., inhibit free radical chain reaction, reduce combustion rate until the flame is extinguished. This inhibition effect is found in the usual bromine and chlorine compounds.

The enhanced effect of flame retardant flame retardant effect (6) (synergy) some materials, if used separately, there is no flame retardant effect or little effect, and a variety of materials can enhance the flame retardant effect. Antimony trioxide and halogen compound are the most typical examples. As a result, not only can the flame retardant efficiency be improved, but also the amount of flame retardant can be reduced.

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