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The effect of flame retardants on plastics
2017-9-30 11:50:36
The effect of flame retardants on plastics
The flame retardant can be added to the plastic, which can make the oxygen index increase and the flame retardant effect is obvious. Oxygen index, of course, saying only that material flammability and flame retardant flame retardant, flame retardant plastic impact should also adopt a series of parameters, such as the critical parameters of spontaneous combustion, heat energy, hot combustion temperature, etc.
Generally speaking, when the plastic containing flame retardant is burning, the flame retardant is used in many aspects of different reaction areas (gas phase and condensed phase). The effect of flame retardants may be different for different materials.
The mechanism of flame retardant is more complex. But the purpose is always to cut off the combustion cycle in physical and chemical ways. The effects of flame retardants on plastics are shown in the following aspects:
(1) in the condensed phase of flame retardant endothermic decomposition, so that the relative slow temperature rise inside the condensed phase, to delay the thermal decomposition temperature of the plastic, the non-combustible gases generated when using the thermal decomposition of flame retardant of gasification and heat to lower the temperature.
(2) flame retardants are decomposed into the heat, releasing the flame retardants of the OH (hydroxy) free radicals in the combustion reaction, and the combustion process of the free radical chain reaction is terminated.
(3) under the heat, the flame retardant appears to absorb heat phase change, preventing the increase of temperature in the condensing phase and slowing the combustion reaction until it stops.
(4) the pyrolysis of the catalytic coagulation, resulting in solid phase product (coking layer) or foam layer, impedes the transfer of heat. This keeps the condensed phase temperature at a lower level, leading to a reduction in the formation rate of the raw material (combustible gas decomposition products) as the gas.
In conclusion, the effect of the flame retardant can be used to slow down the combustion reaction, or to make the reaction (hot spontaneous combustion) difficult, thus to suppress and mitigate the fire hazard.
The physical function of the influence of flame retardants for plastics, perform in when plastic combustion, delay the speed of solid instead should zone temperature, or heat transfer in gas flame area to the solid phase reaction district becomes difficult, the physical process of the total effect, as a result, keeping the temperature of solid phase reaction area at lower levels, so that it is relatively cool.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
CAS No.:13674-87-8
HS: 29199000
Tax Rate (%): 9%
Tris (1,3-Dichloro-2-Propyl) Phosphate (TDCPP) Raw Materials: Phosphorus Oxychloride, Epichlorohydrin
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent.
It is very important to study the effects of flame retardants from chemical reaction kinetics. The flame retardant can slow the thermal decomposition rate in the condensed phase and reduce the rate of flame reaction. The former causes the thermal spontaneous combustion parameters (such as critical temperature and critical size) to become large, making it difficult to cause combustion. The latter reduces the exothermic speed of the flame reaction, so that the expansion and propagation of the reaction are suppressed.
Currently, phospho-containing flame retardants are mostly organic or inorganic compounds containing phosphorus, and its flame retardant effect is better than that of bromide. It has been found that phosphorous flame retardant can produce more coke and reduce the production of flammable volatiles. The weight loss of flame retardant materials can be greatly reduced when burned.
Nowadays, most of the flame retardants used in plastic foam are additive flame retardants, and reactive flame retardants are mainly used in thermosetting resins such as epoxy resin and polyurethane resin. In actual flame retardant technology, a single breed of flame retardant is rarely used. In general, several flame retardants are used to make use of their synergistic effect to increase flame retardant efficiency.
In the regulation of test conditions, the plastic material just can keep burning in oxygen and nitrogen mixture flow state, the required minimum oxygen concentration in oxygen percentage (OI, %). The higher the oxygen index, needed to keep the combustion state oxygen concentration is higher, the flame retardant material.
Under the same filling amount, the ratio of different aluminum hydroxide, magnesium hydroxide, the flame retardant effect is not obvious difference, but the two kinds of compound use performed better than used alone, because although is a dehydration reaction, but there are differences on the decomposition temperature and heat absorption capacity. Magnesium hydroxide needs to be dehydrated at a higher temperature and has a carbonization effect. And magnesium hydroxide heat absorption is relatively small, the effect of temperature rise due to its inhibition materials as aluminum hydroxide, the compound use can complement each other, the flame retardant performance is better than single use effect. However, Mg(OH)2 also has disadvantages such as acid tolerance, dispersibility and poor compatibility.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The flame retardant can be added to the plastic, which can make the oxygen index increase and the flame retardant effect is obvious. Oxygen index, of course, saying only that material flammability and flame retardant flame retardant, flame retardant plastic impact should also adopt a series of parameters, such as the critical parameters of spontaneous combustion, heat energy, hot combustion temperature, etc.
Generally speaking, when the plastic containing flame retardant is burning, the flame retardant is used in many aspects of different reaction areas (gas phase and condensed phase). The effect of flame retardants may be different for different materials.
The mechanism of flame retardant is more complex. But the purpose is always to cut off the combustion cycle in physical and chemical ways. The effects of flame retardants on plastics are shown in the following aspects:
(1) in the condensed phase of flame retardant endothermic decomposition, so that the relative slow temperature rise inside the condensed phase, to delay the thermal decomposition temperature of the plastic, the non-combustible gases generated when using the thermal decomposition of flame retardant of gasification and heat to lower the temperature.
(2) flame retardants are decomposed into the heat, releasing the flame retardants of the OH (hydroxy) free radicals in the combustion reaction, and the combustion process of the free radical chain reaction is terminated.
(3) under the heat, the flame retardant appears to absorb heat phase change, preventing the increase of temperature in the condensing phase and slowing the combustion reaction until it stops.
(4) the pyrolysis of the catalytic coagulation, resulting in solid phase product (coking layer) or foam layer, impedes the transfer of heat. This keeps the condensed phase temperature at a lower level, leading to a reduction in the formation rate of the raw material (combustible gas decomposition products) as the gas.
In conclusion, the effect of the flame retardant can be used to slow down the combustion reaction, or to make the reaction (hot spontaneous combustion) difficult, thus to suppress and mitigate the fire hazard.
The physical function of the influence of flame retardants for plastics, perform in when plastic combustion, delay the speed of solid instead should zone temperature, or heat transfer in gas flame area to the solid phase reaction district becomes difficult, the physical process of the total effect, as a result, keeping the temperature of solid phase reaction area at lower levels, so that it is relatively cool.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
CAS No.:13674-87-8
HS: 29199000
Tax Rate (%): 9%
Tris (1,3-Dichloro-2-Propyl) Phosphate (TDCPP) Raw Materials: Phosphorus Oxychloride, Epichlorohydrin
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent.
It is very important to study the effects of flame retardants from chemical reaction kinetics. The flame retardant can slow the thermal decomposition rate in the condensed phase and reduce the rate of flame reaction. The former causes the thermal spontaneous combustion parameters (such as critical temperature and critical size) to become large, making it difficult to cause combustion. The latter reduces the exothermic speed of the flame reaction, so that the expansion and propagation of the reaction are suppressed.
Currently, phospho-containing flame retardants are mostly organic or inorganic compounds containing phosphorus, and its flame retardant effect is better than that of bromide. It has been found that phosphorous flame retardant can produce more coke and reduce the production of flammable volatiles. The weight loss of flame retardant materials can be greatly reduced when burned.
Nowadays, most of the flame retardants used in plastic foam are additive flame retardants, and reactive flame retardants are mainly used in thermosetting resins such as epoxy resin and polyurethane resin. In actual flame retardant technology, a single breed of flame retardant is rarely used. In general, several flame retardants are used to make use of their synergistic effect to increase flame retardant efficiency.
In the regulation of test conditions, the plastic material just can keep burning in oxygen and nitrogen mixture flow state, the required minimum oxygen concentration in oxygen percentage (OI, %). The higher the oxygen index, needed to keep the combustion state oxygen concentration is higher, the flame retardant material.
Under the same filling amount, the ratio of different aluminum hydroxide, magnesium hydroxide, the flame retardant effect is not obvious difference, but the two kinds of compound use performed better than used alone, because although is a dehydration reaction, but there are differences on the decomposition temperature and heat absorption capacity. Magnesium hydroxide needs to be dehydrated at a higher temperature and has a carbonization effect. And magnesium hydroxide heat absorption is relatively small, the effect of temperature rise due to its inhibition materials as aluminum hydroxide, the compound use can complement each other, the flame retardant performance is better than single use effect. However, Mg(OH)2 also has disadvantages such as acid tolerance, dispersibility and poor compatibility.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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