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Flame retardant of epoxy resin
2017-11-25 11:09:29
Flame retardant of epoxy resin
Red phosphorus is elemental phosphorus, red phosphorus flame retardant mechanism is simple and direct, combustion to generate P2O5 and P2O3, are with strong water absorption properties of anhydride, not only absorbed the natural state of water, but also has strong dewatering properties, effect of red phosphorus flame retardant on the properties of materials can reflect the extraction of H and O elements in the polymer red phosphorus, promote a carbon, while generating phosphate attached to the surface of insulating material for contact with the outside world, achieve the purpose of flame retardant.
The BDP and RDP structures are similar, with the liquid form, the way work should be in the combustion field of condensed phase, into carbon polymer PPO by endothermic rearrangement of methylene crosslinked polyphenols, which can accelerate the dehydration and dehydrogenation of phosphate was endothermic into carbon, and it is not easy to volatilize effect of flame retardant on the properties of materials a reflection with inhibition of free radicals in condensation, alkyl peroxy radicals can remove the surface of polymer.
The best red phosphorus flame retardant effect, adding 4 phr can meet the requirement of fire retardant, cyclic phosphate added 8, add TPP to 10 BDP, and the dosage of RDP is 12, MPP is 16 when the material can reach the standard level UL94V0.
Unlike BDP and RDP, TPP is a volatile phosphate, and volatile phosphorus compounds are effective flame inhibitors. TPP can be cleaved into small molecules or free radicals, which can reduce the concentration of hydrogen free radicals in the flame zone and extinguish the flame.
In PPO/HIPS alloy, PPO forms a protective carbon layer, and TPP acts in the flame zone, thus inhibiting the combustion of combustible products produced by PS cracking in the gas phase.
MPP is a polymeric phosphorus nitrogen expansion type flame retardant, usually suitable for flame retardant, by providing acid source and gas source can achieve good flame retardant effect, in accordance with its flame retardant mechanism, should be in the PPO material in the use effect is good, but the actual experiments show that only after the addition of a large number of cases is to achieve the same results V0 class. Moreover, the effect of MPP flame retardant on the properties of the material is reflected in the toughness of the material, and it is not suitable for PPO/HIPS alloy flame retardant.
In the case of similar flame retardant mechanism and molecular structure, the higher the content of phosphorus is, the better the flame retardant effect of epoxy resin flame retardant is, and the experiment also confirms this point. The size of the content of various flame retardant epoxy resin material: red phosphorus P > cyclic phosphate (20.8%) >MPP (15%) >RDP (10.7%) >TPP (9.4%) >BDP (8.9%)
Tris(2-chloroisopropyl)Phosphate(TCPP)
Tris(2-chloroisopropyl)Phosphate(Flame retardant TCPP) is a colorless or yellowish oily liquid. It is soluble in benzene, alcohol, carbon tetrachloride and other organic solvents, but insoluble in water and aliphatic hydrocarbons. Its relative density is 1.27-1.31, refractive index is 1.4916 ( 21.5 ), viscosity is 58mm2 / S, chlorine content is 32.8%, and phosphorus content is 9.5%. As the molecule contains phosphorus and chlorine element simultaneously, its flame retardant properties is significant, as well as the plasticization, damp-proof, antistatic effects and so on. Tris(2-chloropropyl) phosphate (TCPP) is an additive flame retardant.
The product is used for the soft / hard polyurethane foam, with thermal and hydrolytic stability good, especially suitable for ASTME84 (Level 11) foam, with low viscosity unsaturated polyester resin in low temperature application and phenolic plastics at. This product is also used to grab the foam sealant and sheet production. For polyvinyl chloride, polystyrene, phenolic resin, acrylic resin and rubber, coating, flame retardant, also used for soft and hard polyurethane foam, epoxy resin, polystyrene, cellulose acetate, ethyl cellulose tree and phenolic plastics, polyvinyl acetate and gun type foam sealant production. Particularly recommended for rigid polyurethane foam has excellent thermal and hydrolytic stability is particularly suitable for ASTM84 (II), compound for polyurethane foam and unsaturated resin and phenolic plastics.
Through the above experiments, the best flame retardant epoxy resin material agent red phosphorus flame retardant effect. Using TPP, BDP and RDP to achieve V0 grade flame retardant effect, more than 10 flame retardants need to be added, and the thermal deformation temperature of the material has great influence, which can not reach the experimental purpose. The new cyclic phosphate flame retardant has the characteristics of high phosphorus content, little flame retardant addition, high flame retardant efficiency and little influence on material properties.
The use of red phosphorus flame retardant materials and flame retardant efficiency is the highest, the best comprehensive mechanical properties, cyclic phosphate second, but due to heavy color restrictions, it is difficult to free color, so the actual application is restricted to a certain extent.
In the case of similar flame retardant mechanism and molecular structure, the higher the phosphorus content is, the better the flame retardant effect is. The flame retardant containing benzene ring structure has good compatibility with PPO. At the same time, the lower the molecular weight of the flame retardant, the greater the impact on the mechanical properties of the toughness of the material.
The flame retardant with high molecular weight and strong molecular rigidity can effectively reduce the plasticizing effect of flame retardant on PPO, and reduce the effect of flame retardant on the hot deformation temperature of PPO/HIPS alloy.
Although the debate on the toxicity and non toxicity of brominated flame retardants at home and abroad has never ceased, brominated flame retardants are still the main force in the field of flame retardant worldwide. The advantage of brominated flame retardants is that the decomposition temperature is mostly between 200 and 300 degrees, which matches with the decomposition temperature of various polymers. Therefore, the flame retardant can act as flame retardant at the best time and in the same gas phase and agglomeration. At the same time, the addition of small amount of flame retardant effect is good. At present, bromine flame retardant performance and price still has a great advantage.
The enterprises producing brominated flame retardants are usually individual soldiers, and they do not unite to clarify some rumors about the environmental and human health hazards caused by brominated flame retardants, which lead to a lot of rumors that are not conducive to bromine flame retardants.
The development of phosphorus flame retardants has a long history, mainly inorganic phosphorus flame retardant, intumescent phosphorus flame retardant, organic phosphorus flame retardant, etc.. Intumescent flame retardant meets the requirements of smoke suppression and low toxicity, and is one of the hot spots in the field of flame retardant. Organic phosphorus flame retardants, polymeric metaphosphate combustion can be generated by the formation of a stable, covered on the surface of the composite materials from oxygen and combustible materials, to prevent fire, but its effect is not as good as bromide flame retardant. To achieve the same flame retardant effect, the amount of phosphorus based flame retardants is much higher than that of brominated flame retardants.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Red phosphorus is elemental phosphorus, red phosphorus flame retardant mechanism is simple and direct, combustion to generate P2O5 and P2O3, are with strong water absorption properties of anhydride, not only absorbed the natural state of water, but also has strong dewatering properties, effect of red phosphorus flame retardant on the properties of materials can reflect the extraction of H and O elements in the polymer red phosphorus, promote a carbon, while generating phosphate attached to the surface of insulating material for contact with the outside world, achieve the purpose of flame retardant.
The BDP and RDP structures are similar, with the liquid form, the way work should be in the combustion field of condensed phase, into carbon polymer PPO by endothermic rearrangement of methylene crosslinked polyphenols, which can accelerate the dehydration and dehydrogenation of phosphate was endothermic into carbon, and it is not easy to volatilize effect of flame retardant on the properties of materials a reflection with inhibition of free radicals in condensation, alkyl peroxy radicals can remove the surface of polymer.
The best red phosphorus flame retardant effect, adding 4 phr can meet the requirement of fire retardant, cyclic phosphate added 8, add TPP to 10 BDP, and the dosage of RDP is 12, MPP is 16 when the material can reach the standard level UL94V0.
Unlike BDP and RDP, TPP is a volatile phosphate, and volatile phosphorus compounds are effective flame inhibitors. TPP can be cleaved into small molecules or free radicals, which can reduce the concentration of hydrogen free radicals in the flame zone and extinguish the flame.
In PPO/HIPS alloy, PPO forms a protective carbon layer, and TPP acts in the flame zone, thus inhibiting the combustion of combustible products produced by PS cracking in the gas phase.
MPP is a polymeric phosphorus nitrogen expansion type flame retardant, usually suitable for flame retardant, by providing acid source and gas source can achieve good flame retardant effect, in accordance with its flame retardant mechanism, should be in the PPO material in the use effect is good, but the actual experiments show that only after the addition of a large number of cases is to achieve the same results V0 class. Moreover, the effect of MPP flame retardant on the properties of the material is reflected in the toughness of the material, and it is not suitable for PPO/HIPS alloy flame retardant.
In the case of similar flame retardant mechanism and molecular structure, the higher the content of phosphorus is, the better the flame retardant effect of epoxy resin flame retardant is, and the experiment also confirms this point. The size of the content of various flame retardant epoxy resin material: red phosphorus P > cyclic phosphate (20.8%) >MPP (15%) >RDP (10.7%) >TPP (9.4%) >BDP (8.9%)
Tris(2-chloroisopropyl)Phosphate(TCPP)
Tris(2-chloroisopropyl)Phosphate(Flame retardant TCPP) is a colorless or yellowish oily liquid. It is soluble in benzene, alcohol, carbon tetrachloride and other organic solvents, but insoluble in water and aliphatic hydrocarbons. Its relative density is 1.27-1.31, refractive index is 1.4916 ( 21.5 ), viscosity is 58mm2 / S, chlorine content is 32.8%, and phosphorus content is 9.5%. As the molecule contains phosphorus and chlorine element simultaneously, its flame retardant properties is significant, as well as the plasticization, damp-proof, antistatic effects and so on. Tris(2-chloropropyl) phosphate (TCPP) is an additive flame retardant.
The product is used for the soft / hard polyurethane foam, with thermal and hydrolytic stability good, especially suitable for ASTME84 (Level 11) foam, with low viscosity unsaturated polyester resin in low temperature application and phenolic plastics at. This product is also used to grab the foam sealant and sheet production. For polyvinyl chloride, polystyrene, phenolic resin, acrylic resin and rubber, coating, flame retardant, also used for soft and hard polyurethane foam, epoxy resin, polystyrene, cellulose acetate, ethyl cellulose tree and phenolic plastics, polyvinyl acetate and gun type foam sealant production. Particularly recommended for rigid polyurethane foam has excellent thermal and hydrolytic stability is particularly suitable for ASTM84 (II), compound for polyurethane foam and unsaturated resin and phenolic plastics.
Through the above experiments, the best flame retardant epoxy resin material agent red phosphorus flame retardant effect. Using TPP, BDP and RDP to achieve V0 grade flame retardant effect, more than 10 flame retardants need to be added, and the thermal deformation temperature of the material has great influence, which can not reach the experimental purpose. The new cyclic phosphate flame retardant has the characteristics of high phosphorus content, little flame retardant addition, high flame retardant efficiency and little influence on material properties.
The use of red phosphorus flame retardant materials and flame retardant efficiency is the highest, the best comprehensive mechanical properties, cyclic phosphate second, but due to heavy color restrictions, it is difficult to free color, so the actual application is restricted to a certain extent.
In the case of similar flame retardant mechanism and molecular structure, the higher the phosphorus content is, the better the flame retardant effect is. The flame retardant containing benzene ring structure has good compatibility with PPO. At the same time, the lower the molecular weight of the flame retardant, the greater the impact on the mechanical properties of the toughness of the material.
The flame retardant with high molecular weight and strong molecular rigidity can effectively reduce the plasticizing effect of flame retardant on PPO, and reduce the effect of flame retardant on the hot deformation temperature of PPO/HIPS alloy.
Although the debate on the toxicity and non toxicity of brominated flame retardants at home and abroad has never ceased, brominated flame retardants are still the main force in the field of flame retardant worldwide. The advantage of brominated flame retardants is that the decomposition temperature is mostly between 200 and 300 degrees, which matches with the decomposition temperature of various polymers. Therefore, the flame retardant can act as flame retardant at the best time and in the same gas phase and agglomeration. At the same time, the addition of small amount of flame retardant effect is good. At present, bromine flame retardant performance and price still has a great advantage.
The enterprises producing brominated flame retardants are usually individual soldiers, and they do not unite to clarify some rumors about the environmental and human health hazards caused by brominated flame retardants, which lead to a lot of rumors that are not conducive to bromine flame retardants.
The development of phosphorus flame retardants has a long history, mainly inorganic phosphorus flame retardant, intumescent phosphorus flame retardant, organic phosphorus flame retardant, etc.. Intumescent flame retardant meets the requirements of smoke suppression and low toxicity, and is one of the hot spots in the field of flame retardant. Organic phosphorus flame retardants, polymeric metaphosphate combustion can be generated by the formation of a stable, covered on the surface of the composite materials from oxygen and combustible materials, to prevent fire, but its effect is not as good as bromide flame retardant. To achieve the same flame retardant effect, the amount of phosphorus based flame retardants is much higher than that of brominated flame retardants.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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