News Details
Flame retardant of rigid polyurethane foam
2017-11-23 11:05:06
Flame retardant of rigid polyurethane foam
Because of the toxicity of brominated flame retardants, and then endanger the ecological safety, Europe and the United States have issued laws and regulations to ban some varieties. Brominated flame retardants are banned due to toxicity and toxic gases and large amounts of smoke released during combustion. It is imperative to develop halogen-free, low toxic, smoke suppression halogen-free environment-friendly rigid polyurethane foam flame retardants.
Rigid polyurethane foam flame retardant with high thermal stability, low smoke, heat release rate, less toxicity, flame retardant, research focus when pushing the halogen-free and environment-friendly polyurethane foam flame retardant, environment-friendly and halogen-free flame retardant agent has been pushed into the market with phosphorus nitrogen and phosphorus - mixed type expansion elemental nitrogen expansion type two categories.
The activity of brominated flame retardants is based on thermal decomposition to produce free radicals. In the radical chain reaction of combustion, bromine radical can play the role of scavenger. According to the mechanism of this action, other free radical sources can be used as synergist. The sources of these free radicals mainly include unstable carbon carbon, oxygen oxygen and nitrogen nitrogen bonds.
Most phosphorus based flame retardants play a role of flame retardant in the solidification phase, including the inhibition of flame, molten flow heat consumption, surface barrier formed with phosphoric acid, as well as acid catalyzed carbon, carbon layer insulation, oxygen separation, etc..
When flame retardant cellulose fiber is decomposed by phosphorus flame retardant, phosphoric acid is decomposed at lower temperature, and then phosphoric acid is formed with the increase of temperature, and then condensed into phosphoric acid. Its strong dehydration causes the carbonization of cellulose and inhibits the formation of combustible cellulose cracking products, thus achieving the flame retardant effect. Phosphorus compounds also prevent carbon from being oxidized to carbon dioxide, thereby reducing the heat release.
In rigid polyurethane foam, phosphorus flame retardant can promote the role of carbon, but also flame retardant in the flame gas. But in soft polyurethane foam, only a small amount of carbon can be formed, which is not enough to insulate the insulation. In PET, the phosphorus flame retardant can make the PET burn after the volatile fuel escape, and then with PET acid catalysis softening, thus to promote carbon.
In order to give full play to the carbon action of phosphorus flame retardant, an important method is to combine it with hydrogen compounds. Some nitrogen compounds can enhance the flame retardant effect of phosphorus compounds on cellulose, because the two compounds react to produce substances containing P-N bonds, which have stronger flame retardant effect than phosphorus compounds. Nitrogen compounds of phosphorus and nitrogen can strengthen the oxidation of phosphorus, and release inert gases such as ammonia, and play an oxygen separation function.
Triphenyl Phosphate (TPP)
Triphenyl Phosphatetpp-cas: 15-86-6
EINECS number: 204-112-2
Chinese Name: Triphenyl Phosphate
Chinese alias: phosphoric acid three phenyl ester; flame retardant TPP; TPP
English Name: Triphenyl Phosphate
English alias: Triphenyl Phosphate free of phenol; Triphenyl Phosphate (TPPa); Triphenyl Phosphate white XTL Phosphoric acid triphenyl ester; TPP
Molecular formula: C18H15O4P; OP (OC6H5) 3
Appearance and properties: white crystalline powder, odorless, slightly deliquescence
Molecular weight: 326.29
Steam pressure: 0.01kPa/20 ℃
The above is the product of the CAS, such as Triphenyl Phosphate tpp-cas: 15-86-6 other information please contact us!
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.
Halogen-free is a development direction of flame retardants, which is used to synthesize the flame retardant of polymers such as fibers and plastics.
Over the past ten years, the research and development of intumescent flame retardant IFR very much, the phosphorus nitrogen series, the formation of carbon layer expansion through the synergistic effect of flame retardant in the acid source, the carbon source and the gas source, thereby cutting off the molten polymer and combustible gas, and help reduce the molten polymer into carbon dioxide. Production of flammable gas; then, with the combustion process, and gradually formed the expansion of carbon layer, the expansion of carbon layer with good heat insulation function and strength.
IFR plays a major role through the solidification phase decomposition of flame retardant, delay or prevent the material in the solidification phase heat, reduce fuel and interrupt sources; the combustion of materials formed on the surface of porous carbon layer to heat and oxygen, and can prevent the combustible gas into the gas phase; flame retardant by thermal decomposition temperature of flame retardant is endothermic, stop materials to increase the thermal decomposition temperature, and flame retardant.
IFR includes acid source, carbon source and the gas, they through the interaction between the formation of carbon layer: in the low temperature (150 DEG C), can be used as a dehydrating agent containing acid phosphoric acid source; at a slightly higher temperature, esterification of acid and carbon source, the nitrogen in the system as a catalyst of esterification reaction and accelerate the esterification. The water vapor produced during the reaction and the non combustible gas produced by the gas source make the system melted and expanded. At the same time, the carbon source and ester are dehydrated and carbonized, and the system is further expanded and foamed. Finally, the system is solidified, forming a porous foam carbon layer.
In the IFR three component, the acid source is the most important, and its proportion in the three components is also the largest. Because the main component is in the acid source, the acid source can be called the flame retardant alone, and the carbon source and the gas source are called synergist. The flame retardant efficiency of single acid source is not high, but it is obviously improved with the addition of synergist.
Intumescent flame retardants can also act as a flame retardant in the gas phase, because the phosphorus nitrogen carbon system may produce nitric oxide and ammonia gas when heated, and they can terminate the chain reaction caused by free radicals.
Adding molecular sieve in intumescent flame retardant can improve flame retardant efficiency, reduce heat, inhibit the amount of smoke, and make the structure of phosphorus carbon more stable. Moreover, the molecular sieve is beneficial to form the chain structure and interact with the polymer chain to enhance the flame retardancy of the material.
Intumescent flame retardant has many components and structures, but it can be effectively applied to flame retardant polymers.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Because of the toxicity of brominated flame retardants, and then endanger the ecological safety, Europe and the United States have issued laws and regulations to ban some varieties. Brominated flame retardants are banned due to toxicity and toxic gases and large amounts of smoke released during combustion. It is imperative to develop halogen-free, low toxic, smoke suppression halogen-free environment-friendly rigid polyurethane foam flame retardants.
Rigid polyurethane foam flame retardant with high thermal stability, low smoke, heat release rate, less toxicity, flame retardant, research focus when pushing the halogen-free and environment-friendly polyurethane foam flame retardant, environment-friendly and halogen-free flame retardant agent has been pushed into the market with phosphorus nitrogen and phosphorus - mixed type expansion elemental nitrogen expansion type two categories.
The activity of brominated flame retardants is based on thermal decomposition to produce free radicals. In the radical chain reaction of combustion, bromine radical can play the role of scavenger. According to the mechanism of this action, other free radical sources can be used as synergist. The sources of these free radicals mainly include unstable carbon carbon, oxygen oxygen and nitrogen nitrogen bonds.
Most phosphorus based flame retardants play a role of flame retardant in the solidification phase, including the inhibition of flame, molten flow heat consumption, surface barrier formed with phosphoric acid, as well as acid catalyzed carbon, carbon layer insulation, oxygen separation, etc..
When flame retardant cellulose fiber is decomposed by phosphorus flame retardant, phosphoric acid is decomposed at lower temperature, and then phosphoric acid is formed with the increase of temperature, and then condensed into phosphoric acid. Its strong dehydration causes the carbonization of cellulose and inhibits the formation of combustible cellulose cracking products, thus achieving the flame retardant effect. Phosphorus compounds also prevent carbon from being oxidized to carbon dioxide, thereby reducing the heat release.
In rigid polyurethane foam, phosphorus flame retardant can promote the role of carbon, but also flame retardant in the flame gas. But in soft polyurethane foam, only a small amount of carbon can be formed, which is not enough to insulate the insulation. In PET, the phosphorus flame retardant can make the PET burn after the volatile fuel escape, and then with PET acid catalysis softening, thus to promote carbon.
In order to give full play to the carbon action of phosphorus flame retardant, an important method is to combine it with hydrogen compounds. Some nitrogen compounds can enhance the flame retardant effect of phosphorus compounds on cellulose, because the two compounds react to produce substances containing P-N bonds, which have stronger flame retardant effect than phosphorus compounds. Nitrogen compounds of phosphorus and nitrogen can strengthen the oxidation of phosphorus, and release inert gases such as ammonia, and play an oxygen separation function.
Triphenyl Phosphate (TPP)
Triphenyl Phosphatetpp-cas: 15-86-6
EINECS number: 204-112-2
Chinese Name: Triphenyl Phosphate
Chinese alias: phosphoric acid three phenyl ester; flame retardant TPP; TPP
English Name: Triphenyl Phosphate
English alias: Triphenyl Phosphate free of phenol; Triphenyl Phosphate (TPPa); Triphenyl Phosphate white XTL Phosphoric acid triphenyl ester; TPP
Molecular formula: C18H15O4P; OP (OC6H5) 3
Appearance and properties: white crystalline powder, odorless, slightly deliquescence
Molecular weight: 326.29
Steam pressure: 0.01kPa/20 ℃
The above is the product of the CAS, such as Triphenyl Phosphate tpp-cas: 15-86-6 other information please contact us!
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.
Halogen-free is a development direction of flame retardants, which is used to synthesize the flame retardant of polymers such as fibers and plastics.
Over the past ten years, the research and development of intumescent flame retardant IFR very much, the phosphorus nitrogen series, the formation of carbon layer expansion through the synergistic effect of flame retardant in the acid source, the carbon source and the gas source, thereby cutting off the molten polymer and combustible gas, and help reduce the molten polymer into carbon dioxide. Production of flammable gas; then, with the combustion process, and gradually formed the expansion of carbon layer, the expansion of carbon layer with good heat insulation function and strength.
IFR plays a major role through the solidification phase decomposition of flame retardant, delay or prevent the material in the solidification phase heat, reduce fuel and interrupt sources; the combustion of materials formed on the surface of porous carbon layer to heat and oxygen, and can prevent the combustible gas into the gas phase; flame retardant by thermal decomposition temperature of flame retardant is endothermic, stop materials to increase the thermal decomposition temperature, and flame retardant.
IFR includes acid source, carbon source and the gas, they through the interaction between the formation of carbon layer: in the low temperature (150 DEG C), can be used as a dehydrating agent containing acid phosphoric acid source; at a slightly higher temperature, esterification of acid and carbon source, the nitrogen in the system as a catalyst of esterification reaction and accelerate the esterification. The water vapor produced during the reaction and the non combustible gas produced by the gas source make the system melted and expanded. At the same time, the carbon source and ester are dehydrated and carbonized, and the system is further expanded and foamed. Finally, the system is solidified, forming a porous foam carbon layer.
In the IFR three component, the acid source is the most important, and its proportion in the three components is also the largest. Because the main component is in the acid source, the acid source can be called the flame retardant alone, and the carbon source and the gas source are called synergist. The flame retardant efficiency of single acid source is not high, but it is obviously improved with the addition of synergist.
Intumescent flame retardants can also act as a flame retardant in the gas phase, because the phosphorus nitrogen carbon system may produce nitric oxide and ammonia gas when heated, and they can terminate the chain reaction caused by free radicals.
Adding molecular sieve in intumescent flame retardant can improve flame retardant efficiency, reduce heat, inhibit the amount of smoke, and make the structure of phosphorus carbon more stable. Moreover, the molecular sieve is beneficial to form the chain structure and interact with the polymer chain to enhance the flame retardancy of the material.
Intumescent flame retardant has many components and structures, but it can be effectively applied to flame retardant polymers.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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