News Details
Halogen expansion type flame retardant
2017-10-25 12:00:47
Halogen expansion type flame retardant
Stricter flame retardant regulation requires high thermal stability, low heat release rate, low smoke quantity and high effective flame retardant of low toxicity. From domestic and overseas research hotspot when push without halogen expansion type flame retardant. There are two main types of non-halogen expansion flame retardants that have been pushed into the market.
The activity of bromine flame retardants is based on the pyrolysis of free radicals. In the free radical chain reaction of the combustion process, the bromine free radicals can act as scavengers. Obviously, the mechanism of this action can be used as a synergistic agent for other free radical sources. These free radical sources mainly include unstable carbon-carbon, oxygen-oxygen, nitrogen-nitrogen bonds.
Phosphorus-containing flame retardants are mostly in the solidification phase play flame retardant effect, including inhibition of flame, heat melt flow, containing phosphoric acid to form the surface of the barrier, and acid catalytic into charcoal, charcoal layer of insulation, lie between oxygen and so on.
Phosphorus-containing flame retardant flame retardant cellulose fiber, under the low temperature decomposition of phosphoric acid, generated a rise of temperature metaphosphate, then condensation into polyphosphoric acid, its role prompted strong dehydration of cellulose carbonization, inhibiting the production of the flammability of cellulose pyrolysis content, so as to achieve flame retardant effect. Phosphorus compounds also prevent carbon dioxide from being oxidized to carbon dioxide, thus reducing oxidative heat release.
In rigid polyurethane foam plastics, phosphorous flame retardant can promote carbon. It can also be flame retarded in flame. But soft polyurethane foam can only form a small amount of carbon, not enough to insulate the oxygen. In PET, phosphorous flame retardant can increase the volatile combustible after the combustion of PET, which may be catalyzed by the acid catalysis of PET, thus promoting the growth of carbon.
In order to effectively play the carbon effect of phosphorus flame retardant, an effective and effective way is to combine with hydrogen compounds. Some compounds can enhance phosphorus compound flame retardant effect of cellulose, which compound reaction and generate the compounds containing p-n bond, it is better than phosphorus compounds have stronger flame retardant effect, in the department of phosphorus and nitrogen compounds of phosphorus can be enhanced by oxidation, and can release the inert gas such as ammonia, oxygen isolation effect.
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.
Halogen-free expansion flame retardant is a development direction of flame retardant, which is used for flame retardant of high polymer such as fiber and plastic. In recent 10 years, about expansion type Flame retardant (Intumescent Flame Retapdant, IFR) research and development, mainly the phosphorus - nitrogen series, through the Flame retardant system of the acid source, carbon source, the synergy of gas source, the expansion of the formation of carbon layer to cut off the molten polymer and combustible gases, and help the molten polymer into carbon, reduce the generation of combustible gases, along with the burning, gradually formed carbon layer, the expansion of carbon layer has good heat insulation function and strength.
The expansion type flame retardant (IFR) is mainly used to inhibit the thermal decomposition of materials in solidification phase, and reduce and interrupt the source of combustible materials. The surface of the material is formed by the surface of the porous carbon layer, which is used to insulate and prevent the gas from entering the gas phase.
The flame retardant is absorbed by thermal decomposition to prevent the flame retardant material from reaching the thermal decomposition temperature. The expansion type flame retardant is flame retarded by this mechanism.
IFR includes acid sources, carbon sources and gas sources, which form carbon layers through the interaction of the following interactions.
Under low temperature (150 ℃), source with phosphoric acid acid can be used as dehydrating agent, in high temperature, acid esterification reaction with carbon source; The nitrogen in the system is the catalyst for esterification, accelerating the esterification reaction. The water vapour generated during the reaction and the non-combustible gas produced by the gas source inflate the system that is in a molten state. At the same time, carbon source and ester dehydrated carbonization, the system expanded the foaming, the final system was solidified, forming porous foam carbon layer.
In TFR three components, the source of acid is the main, it is also the largest proportion in the three components, due to the ingredient in the acid source, as shown in the acid source alone can be referred to as flame retardants, and the carbon source and gas source is called association effect, a single source of acid of flame retardant efficiency is not high, but along with the adding of association effect agent improved significantly.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Stricter flame retardant regulation requires high thermal stability, low heat release rate, low smoke quantity and high effective flame retardant of low toxicity. From domestic and overseas research hotspot when push without halogen expansion type flame retardant. There are two main types of non-halogen expansion flame retardants that have been pushed into the market.
The activity of bromine flame retardants is based on the pyrolysis of free radicals. In the free radical chain reaction of the combustion process, the bromine free radicals can act as scavengers. Obviously, the mechanism of this action can be used as a synergistic agent for other free radical sources. These free radical sources mainly include unstable carbon-carbon, oxygen-oxygen, nitrogen-nitrogen bonds.
Phosphorus-containing flame retardants are mostly in the solidification phase play flame retardant effect, including inhibition of flame, heat melt flow, containing phosphoric acid to form the surface of the barrier, and acid catalytic into charcoal, charcoal layer of insulation, lie between oxygen and so on.
Phosphorus-containing flame retardant flame retardant cellulose fiber, under the low temperature decomposition of phosphoric acid, generated a rise of temperature metaphosphate, then condensation into polyphosphoric acid, its role prompted strong dehydration of cellulose carbonization, inhibiting the production of the flammability of cellulose pyrolysis content, so as to achieve flame retardant effect. Phosphorus compounds also prevent carbon dioxide from being oxidized to carbon dioxide, thus reducing oxidative heat release.
In rigid polyurethane foam plastics, phosphorous flame retardant can promote carbon. It can also be flame retarded in flame. But soft polyurethane foam can only form a small amount of carbon, not enough to insulate the oxygen. In PET, phosphorous flame retardant can increase the volatile combustible after the combustion of PET, which may be catalyzed by the acid catalysis of PET, thus promoting the growth of carbon.
In order to effectively play the carbon effect of phosphorus flame retardant, an effective and effective way is to combine with hydrogen compounds. Some compounds can enhance phosphorus compound flame retardant effect of cellulose, which compound reaction and generate the compounds containing p-n bond, it is better than phosphorus compounds have stronger flame retardant effect, in the department of phosphorus and nitrogen compounds of phosphorus can be enhanced by oxidation, and can release the inert gas such as ammonia, oxygen isolation effect.
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.
Halogen-free expansion flame retardant is a development direction of flame retardant, which is used for flame retardant of high polymer such as fiber and plastic. In recent 10 years, about expansion type Flame retardant (Intumescent Flame Retapdant, IFR) research and development, mainly the phosphorus - nitrogen series, through the Flame retardant system of the acid source, carbon source, the synergy of gas source, the expansion of the formation of carbon layer to cut off the molten polymer and combustible gases, and help the molten polymer into carbon, reduce the generation of combustible gases, along with the burning, gradually formed carbon layer, the expansion of carbon layer has good heat insulation function and strength.
The expansion type flame retardant (IFR) is mainly used to inhibit the thermal decomposition of materials in solidification phase, and reduce and interrupt the source of combustible materials. The surface of the material is formed by the surface of the porous carbon layer, which is used to insulate and prevent the gas from entering the gas phase.
The flame retardant is absorbed by thermal decomposition to prevent the flame retardant material from reaching the thermal decomposition temperature. The expansion type flame retardant is flame retarded by this mechanism.
IFR includes acid sources, carbon sources and gas sources, which form carbon layers through the interaction of the following interactions.
Under low temperature (150 ℃), source with phosphoric acid acid can be used as dehydrating agent, in high temperature, acid esterification reaction with carbon source; The nitrogen in the system is the catalyst for esterification, accelerating the esterification reaction. The water vapour generated during the reaction and the non-combustible gas produced by the gas source inflate the system that is in a molten state. At the same time, carbon source and ester dehydrated carbonization, the system expanded the foaming, the final system was solidified, forming porous foam carbon layer.
In TFR three components, the source of acid is the main, it is also the largest proportion in the three components, due to the ingredient in the acid source, as shown in the acid source alone can be referred to as flame retardants, and the carbon source and gas source is called association effect, a single source of acid of flame retardant efficiency is not high, but along with the adding of association effect agent improved significantly.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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