News Details
Expansion flame retardant (EFR)
2017-9-19 11:32:25
Expansion flame retardant (EFR)
In the non-halogen free flame retardant system which can be used in rubber, the expansive flame retardant (EFR) is one of the flame retardant systems that are studied and considered to have the prospect of industrial application. When the flame retardant rubber of IFR is heated or burned, it can form an expansive carbon layer on its surface, thus having excellent flame retardant performance, and a certain linear relationship between the carbon rate and flame retardancy.
Moreover, when the rubber of IFR is burnt, it is not easy to produce molten droplets, and the volume of smoke and the production of toxic gases can be greatly reduced, sometimes even lower than the non-flame retardant base material. The IFR is usually phosphorus-nitrogen as the active component, without halogen, and it does not need to be combined with antimony. IFR containing acid source, carbon source and air three components, the components separately used in rubber, flame retardant performance not beautiful, but three source when used together, can significantly improve the oxygen index of the rubber and UL94V flame retardant grade.
In addition, if the use of IFR flame retardant rubber is too large, it cannot form all the covered carbon layers. Therefore, the use of IFR is limited to very thin rubber products.
A series of IFR can be used for rubber, the most common acid source is the APP (often coated), and other phosphates, phosphoric acid, boric acid, etc. The most common sources of carbon are pentaerythritol or dipentaerythritol, with other starch, sugar, dextrin, and some high polymers. The most convenient sources of gas are melamine, other such as urea, dicyandiamide, polyamide, etc., but the three sources must have appropriate proportions.
Trixylyl Phosphate(TXP) Use
Phosphate Trisphenylene Phosphate Is Low, Resistant To Hydrolysis, Good Flame Retardant Can Be Used As Vinyl Resin, Cellulose Resin, Natural And Synthetic Rubber Plasticizer, Low Volatility, Good Water Resistance, Flame Retardant. Trichenylene Phosphate Use For Use In Combustible Turbine Oils, With Good Flame Resistance And Good Thermal Oxidation Safety, Good Lubricity, Extreme Pressure Antiwear Additives For Lubricants, Thickeners. Also Used For Fire-Resistant Turbine Oil, With Good Thermal Oxidation Stability, Lubricity, As A Lubricant Anti-Wear Additives, Plasticizers, But Also For Flame Retardant, Wear-Resistant, Resistant To The Mold Of The Cable, Ethylene Conveyor Belt, Artificial Leather, Foam, Flooring Materials, But Also In Metallurgy, Electricity, Mechanical Engineering And Other Aspects As A Fire-Resistant Hydraulic Oil.
However, this classic IFR has some water solubility (especially when the APP has a low degree of polymerization), and the flame retardancy of the flame retardant is often difficult to pass through the water resistance test. If melamine or pyrophosphate is used instead of an APP, the water resistance and heat resistance of IFR can be improved. Because the nitrogen content of melamine and pyrophosphate is much higher than that of the APP, the first two can form IFR with the APP and pentaerythritol or double pentaerythritol, without the addition of air source.
In addition, if carbon source exists in the flame retardant materials, the IFR does not sometimes have to join the carbon source. There are already many market IFR, which are a mixture of several components. There are also so-called monolecular IFR, which is derived from the same molecule. This type of IFR is still in the laboratory stage, with minimal industrial production, such as pentaerythritol diphosphate, which is one example. But even if it is single molecule IFR, the proportion of three sources is very difficult to fit, so it needs to be matched with other relative components.
In addition, the expanded graphite is also used in rubber, and the application form IFR, such as APP/expanded graphite (4/1, m/m) has been used for flame retardant butyl rubber and polybutadiene rubber. Moreover, single expansive graphite has been used in flame retardant natural rubber and ethylene acetate copolymer.
APP as flame retardant in rubber, often be coated, and appropriate USES long key type Ⅱ APP, and often with other flame retardants (ATH) and, for example APP + ATH system is an effective low toxicity of butyl rubber flame retardant, low smoke. Halogen free phosphate was actually rubber flame retardant plasticizer, flame retardant rubber with them, including aryl can endow with rubber with good flame retardancy, low temperature flexibility but material is reduced, the effect of alkyl, on the other hand, while alkyl aryl phosphate ester flame retardant and low temperature performance of rubber.
Generally speaking, the above phosphatates are used in flame retardant rubber, and the volatilization and migration are both larger, and the rubber compatibility is not good enough. In order for the rubber to meet the required flame retardant level, it is rarely used with a single phosphate, usually with other flame retardant components. The flame retardant effect of halogen phosphate ester is excellent, because the halogen content is very high (30% ~ 50%), and the phosphorus content is about 10%, but it is being evaluated for their harmfulness.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
In the non-halogen free flame retardant system which can be used in rubber, the expansive flame retardant (EFR) is one of the flame retardant systems that are studied and considered to have the prospect of industrial application. When the flame retardant rubber of IFR is heated or burned, it can form an expansive carbon layer on its surface, thus having excellent flame retardant performance, and a certain linear relationship between the carbon rate and flame retardancy.
Moreover, when the rubber of IFR is burnt, it is not easy to produce molten droplets, and the volume of smoke and the production of toxic gases can be greatly reduced, sometimes even lower than the non-flame retardant base material. The IFR is usually phosphorus-nitrogen as the active component, without halogen, and it does not need to be combined with antimony. IFR containing acid source, carbon source and air three components, the components separately used in rubber, flame retardant performance not beautiful, but three source when used together, can significantly improve the oxygen index of the rubber and UL94V flame retardant grade.
In addition, if the use of IFR flame retardant rubber is too large, it cannot form all the covered carbon layers. Therefore, the use of IFR is limited to very thin rubber products.
A series of IFR can be used for rubber, the most common acid source is the APP (often coated), and other phosphates, phosphoric acid, boric acid, etc. The most common sources of carbon are pentaerythritol or dipentaerythritol, with other starch, sugar, dextrin, and some high polymers. The most convenient sources of gas are melamine, other such as urea, dicyandiamide, polyamide, etc., but the three sources must have appropriate proportions.
Trixylyl Phosphate(TXP) Use
Phosphate Trisphenylene Phosphate Is Low, Resistant To Hydrolysis, Good Flame Retardant Can Be Used As Vinyl Resin, Cellulose Resin, Natural And Synthetic Rubber Plasticizer, Low Volatility, Good Water Resistance, Flame Retardant. Trichenylene Phosphate Use For Use In Combustible Turbine Oils, With Good Flame Resistance And Good Thermal Oxidation Safety, Good Lubricity, Extreme Pressure Antiwear Additives For Lubricants, Thickeners. Also Used For Fire-Resistant Turbine Oil, With Good Thermal Oxidation Stability, Lubricity, As A Lubricant Anti-Wear Additives, Plasticizers, But Also For Flame Retardant, Wear-Resistant, Resistant To The Mold Of The Cable, Ethylene Conveyor Belt, Artificial Leather, Foam, Flooring Materials, But Also In Metallurgy, Electricity, Mechanical Engineering And Other Aspects As A Fire-Resistant Hydraulic Oil.
However, this classic IFR has some water solubility (especially when the APP has a low degree of polymerization), and the flame retardancy of the flame retardant is often difficult to pass through the water resistance test. If melamine or pyrophosphate is used instead of an APP, the water resistance and heat resistance of IFR can be improved. Because the nitrogen content of melamine and pyrophosphate is much higher than that of the APP, the first two can form IFR with the APP and pentaerythritol or double pentaerythritol, without the addition of air source.
In addition, if carbon source exists in the flame retardant materials, the IFR does not sometimes have to join the carbon source. There are already many market IFR, which are a mixture of several components. There are also so-called monolecular IFR, which is derived from the same molecule. This type of IFR is still in the laboratory stage, with minimal industrial production, such as pentaerythritol diphosphate, which is one example. But even if it is single molecule IFR, the proportion of three sources is very difficult to fit, so it needs to be matched with other relative components.
In addition, the expanded graphite is also used in rubber, and the application form IFR, such as APP/expanded graphite (4/1, m/m) has been used for flame retardant butyl rubber and polybutadiene rubber. Moreover, single expansive graphite has been used in flame retardant natural rubber and ethylene acetate copolymer.
APP as flame retardant in rubber, often be coated, and appropriate USES long key type Ⅱ APP, and often with other flame retardants (ATH) and, for example APP + ATH system is an effective low toxicity of butyl rubber flame retardant, low smoke. Halogen free phosphate was actually rubber flame retardant plasticizer, flame retardant rubber with them, including aryl can endow with rubber with good flame retardancy, low temperature flexibility but material is reduced, the effect of alkyl, on the other hand, while alkyl aryl phosphate ester flame retardant and low temperature performance of rubber.
Generally speaking, the above phosphatates are used in flame retardant rubber, and the volatilization and migration are both larger, and the rubber compatibility is not good enough. In order for the rubber to meet the required flame retardant level, it is rarely used with a single phosphate, usually with other flame retardant components. The flame retardant effect of halogen phosphate ester is excellent, because the halogen content is very high (30% ~ 50%), and the phosphorus content is about 10%, but it is being evaluated for their harmfulness.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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