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Flame retardant mechanism of expansive flame retardant
2017-10-6 11:27:29
Flame retardant mechanism of expansive flame retardant
The flammability of composite materials, especially thermoplastic materials, leads to the development of the flame retardant system. Flame retardant can be divided into inorganic flame retardant and organic flame retardant. Inorganic flame retardants have flame retardant and smoke suppression effect at the same time, the burning does not produce poisonous gas and corrosive gas, but the amount is larger, so seriously affect the physical and mechanical properties and processing properties of flame retardant materials, widely used at home and abroad superfine refinement of solid particles, the surface activity processing, microcapsule method to improve its performance.
Organic flame retardant with halogen flame retardant and phosphorous flame retardant. Halogen flame retardant flame retardant effect is good, but the HX that rises flame retardant action is poisonous corrosive gas, will gradually be eliminated; The phosphor flame retardant is less toxic, but the flame retardant efficiency is low. In order to improve the flame retardant effect, phosphorus-nitrogen synergistic flame retardation is applied.
The expansion type flame retardant (IFR) is a flame retardant composed mainly of phosphorus and nitrogen. It contains no halogen, and it does not use antimony oxide as the coefficent agent. It is an environmental flame retardant with high flame retardant efficiency. Since the 1990s, the expansion of flame retardants has become one of the most active research fields and is widely recognized as one of the promising ways to achieve the non-halogenation of flame retardants.
The flame retardant mechanism of expansive flame retardant is constantly updated, and it is widely accepted by domestic scholars that the expansive flame retardant system is composed of three parts: acid source, carbon source and gas source.
The acid source is usually inorganic acid or heated to a certain temperature, which can form inorganic acid compounds, such as phosphoric acid, trichloride phosphorus, ammonium polyphosphate, etc. Carbon source is also known as carbonaceous agent, which is the basis of forming the carbonization layer of foam. It is mainly some polyhydroxy compounds with high carbon content, such as pentaerythritol, starch, etc. Air source is also called foaming source, commonly used foaming source has melamine, dicyandiamide and so on. Some foreign scholars believe that the expansion type flame retardant consists of four parts: adhesive, carbonization agent, carbonization catalyst (acid source) and foaming agent.
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.
Expansion type flame retardant mechanism of the flame retardant is: when the heat source of acid decomposition of dehydrating agent, it can form ester and into carbon agent, ester and dehydration crosslinking to form carbon foaming agent at the same time release a great deal of help and expansion of carbon layer. Thick coal layer increased with temperature gradient on the surface of the carbon layer on the surface of polymer material, to make the polymer surface temperature of the flame temperature is much lower, reduce the possibility of a polymer further degradation of release of flammable gas, at the same time cut off from the outside world into oxygen, so for a long time can have flame retardant effect on polymer.
In order to further study of the flame retardant mechanism of expansion type flame retardant, to overcome before inflating carbon layer material properties research within 430 ℃ flame retardant system, only SergeBourbigot by micro - such as Raman spectroscopy, 1 h, 13 c and 31 p NMR studies of the ammonium polyphosphate, pentaerythritol expansion type flame retardant system of solid phase spectra of above 430 ℃.
When the temperature rises, the structure is changing, 280 ℃ are mainly aromatic and aliphatic molecular by phosphate (salt) bridge links; Increases with increasing temperature, the concentration of aromatic molecules, 560 ℃ when the aromatic molecule group occupied the main position, so the structure to increase rigidity, the deformation and stress, formed the P4O10 crystal in the coal layer. The study of the carbonization mechanism of high temperature expansion provides theoretical guidance for the synthesis of new expansive flame retardant and flame retardant modification.
Zhi-ling ma etc. Based on the expansion effect and application of IFR in pp flame retardant effect, the study found the rigid structure of the flame retardant has a better flame retardant effect, IFR material is the key to improve the effect of flame retardant is overcome to burn drop phenomenon, improve the effect of inflation.
The new modified expansive flame retardant system has been developing rapidly since the 1990s, and many scholars at home and abroad have done a lot of research on it.
Such as xu jiyan, hu yuan, etc., is an effective way to realize the development of flame retardant materials in the direction of greening and environmental protection. Expansion flame retardant systems composed of PVA and phosphorus compound flame retardant effect is good, but as a result of phosphoric acid, phosphate, when used together with PVA easy clot, make its water-soluble destroyed, and easy absorption of moisture, salt phenomenon in a performance. And the phosphate is insoluble in water and can not be used with PVA, so that the application of the system is limited.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The flammability of composite materials, especially thermoplastic materials, leads to the development of the flame retardant system. Flame retardant can be divided into inorganic flame retardant and organic flame retardant. Inorganic flame retardants have flame retardant and smoke suppression effect at the same time, the burning does not produce poisonous gas and corrosive gas, but the amount is larger, so seriously affect the physical and mechanical properties and processing properties of flame retardant materials, widely used at home and abroad superfine refinement of solid particles, the surface activity processing, microcapsule method to improve its performance.
Organic flame retardant with halogen flame retardant and phosphorous flame retardant. Halogen flame retardant flame retardant effect is good, but the HX that rises flame retardant action is poisonous corrosive gas, will gradually be eliminated; The phosphor flame retardant is less toxic, but the flame retardant efficiency is low. In order to improve the flame retardant effect, phosphorus-nitrogen synergistic flame retardation is applied.
The expansion type flame retardant (IFR) is a flame retardant composed mainly of phosphorus and nitrogen. It contains no halogen, and it does not use antimony oxide as the coefficent agent. It is an environmental flame retardant with high flame retardant efficiency. Since the 1990s, the expansion of flame retardants has become one of the most active research fields and is widely recognized as one of the promising ways to achieve the non-halogenation of flame retardants.
The flame retardant mechanism of expansive flame retardant is constantly updated, and it is widely accepted by domestic scholars that the expansive flame retardant system is composed of three parts: acid source, carbon source and gas source.
The acid source is usually inorganic acid or heated to a certain temperature, which can form inorganic acid compounds, such as phosphoric acid, trichloride phosphorus, ammonium polyphosphate, etc. Carbon source is also known as carbonaceous agent, which is the basis of forming the carbonization layer of foam. It is mainly some polyhydroxy compounds with high carbon content, such as pentaerythritol, starch, etc. Air source is also called foaming source, commonly used foaming source has melamine, dicyandiamide and so on. Some foreign scholars believe that the expansion type flame retardant consists of four parts: adhesive, carbonization agent, carbonization catalyst (acid source) and foaming agent.
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.
Expansion type flame retardant mechanism of the flame retardant is: when the heat source of acid decomposition of dehydrating agent, it can form ester and into carbon agent, ester and dehydration crosslinking to form carbon foaming agent at the same time release a great deal of help and expansion of carbon layer. Thick coal layer increased with temperature gradient on the surface of the carbon layer on the surface of polymer material, to make the polymer surface temperature of the flame temperature is much lower, reduce the possibility of a polymer further degradation of release of flammable gas, at the same time cut off from the outside world into oxygen, so for a long time can have flame retardant effect on polymer.
In order to further study of the flame retardant mechanism of expansion type flame retardant, to overcome before inflating carbon layer material properties research within 430 ℃ flame retardant system, only SergeBourbigot by micro - such as Raman spectroscopy, 1 h, 13 c and 31 p NMR studies of the ammonium polyphosphate, pentaerythritol expansion type flame retardant system of solid phase spectra of above 430 ℃.
When the temperature rises, the structure is changing, 280 ℃ are mainly aromatic and aliphatic molecular by phosphate (salt) bridge links; Increases with increasing temperature, the concentration of aromatic molecules, 560 ℃ when the aromatic molecule group occupied the main position, so the structure to increase rigidity, the deformation and stress, formed the P4O10 crystal in the coal layer. The study of the carbonization mechanism of high temperature expansion provides theoretical guidance for the synthesis of new expansive flame retardant and flame retardant modification.
Zhi-ling ma etc. Based on the expansion effect and application of IFR in pp flame retardant effect, the study found the rigid structure of the flame retardant has a better flame retardant effect, IFR material is the key to improve the effect of flame retardant is overcome to burn drop phenomenon, improve the effect of inflation.
The new modified expansive flame retardant system has been developing rapidly since the 1990s, and many scholars at home and abroad have done a lot of research on it.
Such as xu jiyan, hu yuan, etc., is an effective way to realize the development of flame retardant materials in the direction of greening and environmental protection. Expansion flame retardant systems composed of PVA and phosphorus compound flame retardant effect is good, but as a result of phosphoric acid, phosphate, when used together with PVA easy clot, make its water-soluble destroyed, and easy absorption of moisture, salt phenomenon in a performance. And the phosphate is insoluble in water and can not be used with PVA, so that the application of the system is limited.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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