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Polystyrene (PS) halogen free flame retardant
2017-12-5 10:52:24
Polystyrene (PS) halogen free flame retardant
Different polystyrene (PS) halogen free flame retardants have different flame retardancy. The mechanism of polystyrene (PS) halogen free flame retardants is quite complex.
The mechanism of polystyrene (PS) halogen free flame retardant is introduced.
Polystyrene (PS) without the effect of halogen flame retardant mechanism (1) diaphragm mechanism under high temperature, some flame retardants can form a layer of film on the surface of the plastic isolation, cut off the air, so as to prevent the transfer of heat, reduce the release amount of combustible gas and oxygen isolation effect, so as to achieve the purpose of flame retardant. This kind of flame retardant can be divided into two cases:
(1) the flame retardant is decomposed into non-volatile and non oxidized glassy thin films at the combustion temperature, which can isolate air (or oxygen) on the surface of the material, and enable the heat to reflect or reduce the thermal conductivity, thereby playing a flame-retardant effect. Such as boric acid and hydrated borate.
Second, the flame retardant can dehydrate and carbonate the material surface under the burning temperature, and form a porous insulating coke layer, thus preventing the heat conduction and playing a role of flame retardancy, which is called the flame retardant mechanism of condensed phase. Such as the red phosphorus flame retardant treated cellulose, ammonium salt. The porous carbon layer formed by the following steps: first at low temperature by carbon source release polyols can esterification and can be used as dehydrating agent and inorganic acid; esterification reaction occurred in slightly higher than the release of acid temperature and amine as catalyst in esterification; then system melt before or in the process of esterification, and the water vapor generated in the reaction and the combustible gas from the gas source to melt system further expansion foam; finally in the reaction system is nearing completion, and the formation of porous carbon foam curing adhesive layer.
The action mechanism of polystyrene (PS) halogen free flame retardants (2) non flammable gas mechanism, flame retardant can instantly decompose non combustible gases at moderate temperature, dilute flammable gases and prevent combustion. If the halogen flame retardant is the representative of this kind, the organic halogen compounds are released from the HX uncombustible gas after being heated.
The action mechanism of polystyrene (PS) halogen free flame retardants (3) the cooling mechanism, which severely decomposes and absorbs a lot of heat at high temperature, reduces the ambient temperature and prevents combustion from going on. Such as aluminum hydroxide and magnesium hydroxide, when the thermal decomposition of the release of crystal water and absorb a lot of heat, water vapor and reduce the concentration of combustible gas, and the material is isolated from the air; hot oxygen heat-resistant metal oxide Al2O3 and MgO will also generate the catalytic polymer cross-linking reaction to form a layer of film on the surface of polymer carbonization, weaken the heat transfer and mass transfer effect during combustion of materials, which not only to stop the burning effect, but also played the role of smoke.
Tris(2-chloroisopropyl)Phosphate(TCPP)
The production process of flame retardant TCPP with the following steps:
(1) to three phosphorus oxychloride and epichlorohydrin by phosphoric acid, three in catalysis of AlCl3 (2, 3- two Lv Bingji) ester mixture.
(2) added to the mixed solutions of alkali, alkali washing to neutral, static stratified, removing water; reservoir water again after the static stratified, removing water, reservoir after distillation liquid phosphoric acid three (2, 3- two Lv Bingji) ester, and the nitrogen gas purification. This process has the advantages of simple preparation process, to produce phosphoric acid three (2, 3- two Lv Bingji) ester as compared with the existing production process of high purity, its quality detection results were better than the existing technology in the production process to produce phosphoric acid three (2, 3- two chloropropyl) ester.
Process the above description of the product, such as the flame retardant TCPP production technology to further understand please contact us.
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.
The temperature range of Al (OH) 3 decomposition is 235~350 C, and the endothermic amount is 968 J/g. Because of its low decomposition temperature, as a flame retardant, it is usually applied only to plastics with low processing temperature. With Al (OH) 3, Mg (OH) 2 has better thermal stability and stronger carbon substrate and improve the ability of the oxygen index; decomposition temperature up to 340~490 DEG C, can satisfy the mixing and molding many mixed plastic resin, and the addition of Mg (OH) polymer material 2 can bear a higher processing temperature, can accelerate the rate of extrusion, shorten the molding time; at the same time in the preparation of no emissions of harmful substances, so in the process, can replace the Al on many occasions (OH) 3.
The action mechanism of polystyrene (PS) halogen free flame retardants (4) terminates the chain reaction mechanism. The decomposition products of flame retardants are easy to react with reactive radicals, reducing the concentration of some free radicals, so that the key reaction chain in combustion can not go smoothly. If the halogen-free flame retardant is decomposed at the combustion temperature, the non combustible gas HX can react with the reactive free radical HO reaction in the combustion process and cut off the chain reaction of the combustion radical to achieve the purpose of flame-retardant. As is the mechanism of red phosphorus flame retardant flame retardant. After the formation of thermal decomposition of red phosphorus with strong metaphosphate dehydration, so that the polymer surface carbonization combustion; release of charring layer can prevent flammable gas, and has the effect of heat. In addition, red phosphorus and oxygen free radical formation of PO? Into the gas phase, can capture a lot of H? And HO? Free radicals, so as to prevent burning effect.
Western Europe is in the building materials and other industries to implement fire retardant classification methods and new testing standards, China has the approval of building materials and products burning performance grade of the national standard, with the western new standard this standard common features, namely in the evaluation of flame retardant performance, emphasizes the product of the heat release rate, the development rate of fire, the smoke of burning and corrosive and toxic, in order to pass the new standard, the traditional halogen flame retardant materials will become incapable of action, people will turn to the use of carbon into flame retardant plastics (especially intumescent flame retardant plastics) and flame retardant thermosetting plastics, which is in line with the RoHS directive on the restriction of hazardous substances and prohibit the use of requirements the.
The new flame retardant system has small amount of smoke and does not produce toxic and corrosive gases. Halogen-free flame retardants are mainly phosphorous and metal hydroxide. These two compounds, which do not volatilize or produce corrosive gases when burning, are known as nuisance free flame retardants. In addition, there are new kinds of polystyrene (PS) halogen free flame retardants, such as silicon flame retardants and nitrogen flame retardants. These new polystyrene (PS) halogen free flame retardants have become a new product in line with international standard development trend.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Different polystyrene (PS) halogen free flame retardants have different flame retardancy. The mechanism of polystyrene (PS) halogen free flame retardants is quite complex.
The mechanism of polystyrene (PS) halogen free flame retardant is introduced.
Polystyrene (PS) without the effect of halogen flame retardant mechanism (1) diaphragm mechanism under high temperature, some flame retardants can form a layer of film on the surface of the plastic isolation, cut off the air, so as to prevent the transfer of heat, reduce the release amount of combustible gas and oxygen isolation effect, so as to achieve the purpose of flame retardant. This kind of flame retardant can be divided into two cases:
(1) the flame retardant is decomposed into non-volatile and non oxidized glassy thin films at the combustion temperature, which can isolate air (or oxygen) on the surface of the material, and enable the heat to reflect or reduce the thermal conductivity, thereby playing a flame-retardant effect. Such as boric acid and hydrated borate.
Second, the flame retardant can dehydrate and carbonate the material surface under the burning temperature, and form a porous insulating coke layer, thus preventing the heat conduction and playing a role of flame retardancy, which is called the flame retardant mechanism of condensed phase. Such as the red phosphorus flame retardant treated cellulose, ammonium salt. The porous carbon layer formed by the following steps: first at low temperature by carbon source release polyols can esterification and can be used as dehydrating agent and inorganic acid; esterification reaction occurred in slightly higher than the release of acid temperature and amine as catalyst in esterification; then system melt before or in the process of esterification, and the water vapor generated in the reaction and the combustible gas from the gas source to melt system further expansion foam; finally in the reaction system is nearing completion, and the formation of porous carbon foam curing adhesive layer.
The action mechanism of polystyrene (PS) halogen free flame retardants (2) non flammable gas mechanism, flame retardant can instantly decompose non combustible gases at moderate temperature, dilute flammable gases and prevent combustion. If the halogen flame retardant is the representative of this kind, the organic halogen compounds are released from the HX uncombustible gas after being heated.
The action mechanism of polystyrene (PS) halogen free flame retardants (3) the cooling mechanism, which severely decomposes and absorbs a lot of heat at high temperature, reduces the ambient temperature and prevents combustion from going on. Such as aluminum hydroxide and magnesium hydroxide, when the thermal decomposition of the release of crystal water and absorb a lot of heat, water vapor and reduce the concentration of combustible gas, and the material is isolated from the air; hot oxygen heat-resistant metal oxide Al2O3 and MgO will also generate the catalytic polymer cross-linking reaction to form a layer of film on the surface of polymer carbonization, weaken the heat transfer and mass transfer effect during combustion of materials, which not only to stop the burning effect, but also played the role of smoke.
Tris(2-chloroisopropyl)Phosphate(TCPP)
The production process of flame retardant TCPP with the following steps:
(1) to three phosphorus oxychloride and epichlorohydrin by phosphoric acid, three in catalysis of AlCl3 (2, 3- two Lv Bingji) ester mixture.
(2) added to the mixed solutions of alkali, alkali washing to neutral, static stratified, removing water; reservoir water again after the static stratified, removing water, reservoir after distillation liquid phosphoric acid three (2, 3- two Lv Bingji) ester, and the nitrogen gas purification. This process has the advantages of simple preparation process, to produce phosphoric acid three (2, 3- two Lv Bingji) ester as compared with the existing production process of high purity, its quality detection results were better than the existing technology in the production process to produce phosphoric acid three (2, 3- two chloropropyl) ester.
Process the above description of the product, such as the flame retardant TCPP production technology to further understand please contact us.
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.
The temperature range of Al (OH) 3 decomposition is 235~350 C, and the endothermic amount is 968 J/g. Because of its low decomposition temperature, as a flame retardant, it is usually applied only to plastics with low processing temperature. With Al (OH) 3, Mg (OH) 2 has better thermal stability and stronger carbon substrate and improve the ability of the oxygen index; decomposition temperature up to 340~490 DEG C, can satisfy the mixing and molding many mixed plastic resin, and the addition of Mg (OH) polymer material 2 can bear a higher processing temperature, can accelerate the rate of extrusion, shorten the molding time; at the same time in the preparation of no emissions of harmful substances, so in the process, can replace the Al on many occasions (OH) 3.
The action mechanism of polystyrene (PS) halogen free flame retardants (4) terminates the chain reaction mechanism. The decomposition products of flame retardants are easy to react with reactive radicals, reducing the concentration of some free radicals, so that the key reaction chain in combustion can not go smoothly. If the halogen-free flame retardant is decomposed at the combustion temperature, the non combustible gas HX can react with the reactive free radical HO reaction in the combustion process and cut off the chain reaction of the combustion radical to achieve the purpose of flame-retardant. As is the mechanism of red phosphorus flame retardant flame retardant. After the formation of thermal decomposition of red phosphorus with strong metaphosphate dehydration, so that the polymer surface carbonization combustion; release of charring layer can prevent flammable gas, and has the effect of heat. In addition, red phosphorus and oxygen free radical formation of PO? Into the gas phase, can capture a lot of H? And HO? Free radicals, so as to prevent burning effect.
Western Europe is in the building materials and other industries to implement fire retardant classification methods and new testing standards, China has the approval of building materials and products burning performance grade of the national standard, with the western new standard this standard common features, namely in the evaluation of flame retardant performance, emphasizes the product of the heat release rate, the development rate of fire, the smoke of burning and corrosive and toxic, in order to pass the new standard, the traditional halogen flame retardant materials will become incapable of action, people will turn to the use of carbon into flame retardant plastics (especially intumescent flame retardant plastics) and flame retardant thermosetting plastics, which is in line with the RoHS directive on the restriction of hazardous substances and prohibit the use of requirements the.
The new flame retardant system has small amount of smoke and does not produce toxic and corrosive gases. Halogen-free flame retardants are mainly phosphorous and metal hydroxide. These two compounds, which do not volatilize or produce corrosive gases when burning, are known as nuisance free flame retardants. In addition, there are new kinds of polystyrene (PS) halogen free flame retardants, such as silicon flame retardants and nitrogen flame retardants. These new polystyrene (PS) halogen free flame retardants have become a new product in line with international standard development trend.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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