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Flame retardant for expansion type fire retardant
2017-10-24 11:51:15
Flame retardant for expansion type fire retardant
The selection principle of flame retardant flame retardant system and flame retardant is described in this paper.
An inflating coating used in flame retardant generally called expansion type flame retardant, fire retardant coating with the research of fire retardant coating from the expansion model to make the transition to inflating, the corresponding expansion type flame retardant and fire retardant coating from the expansion to the expansion type fire retardant system transition, and entered a stage of stable development.
In the research and application of expansion type flame retardant fire retardant coating, basically formed a P - C - N flame retardant system, the system according to its function including dehydration catalyst, carbonation agent and foaming agent, the points mentioned below.
As key components of fire retardant coating intumescent, dehydration catalyst's main purpose is to promote and improve the thermal decomposition process of coating and promote form three-dimensional carbonaceous non-flammable layer structure, reduce the thermal decomposition of combustible tar, the quantity of aldehydes and ketones; To promote the occurrence of non-combustible gas reactions. In the past, ammonium phosphate and dihydrogen phosphate were used as catalysts for dehydration, but they were eliminated in the late 1970s due to their high water solubility and low thermal stability.
Polyphosphate (APP), magnesium phosphate and melamine (MP) are now commonly used in the process of pyrolysis and dehydration of polyols. The APP is a good dewatering agent, which is the molecular formula (NH4)n+2PnO3n+ 1, and has been demonstrated by infrared spectroscopy and 31P nuclear magnetic resonance (NMR) that the structure is a chain polymer with no branched chain.
Experiments show that phosphate, poly phosphate salts, esters, amides, as long as it is in 100 - value = "250" UnitName = "℃ > 250 ℃ can be decomposed to produce the corresponding acid, can be used as dehydration catalyst.
In the study of fire retardant coating and industrial production, the factors such as water solubility, thermal stability, phosphorus content and raw material price should be taken into account, and then decide which dehydration catalyst to adopt.
Triisobutyl Phosphate(TIBP) is mainly used for antifoamer and penetrant. It is also be widely used in printing and dying, ink, construction, and oil field additives, etc. Another chemical name of Triisobutyl Phosphate (TIBP) is tri -butyl phosphate.
When the coating encounters flame or high temperature effect, in the action of the catalyst, the carbonized agent dehydrates carbonization form carbon layer. The effectiveness of the carbonizer is mainly determined by its carbon content and the number of hydroxyl groups. The carbon content in the carbonized agent determines the rate of carbonization, and the hydroxyl content determines the dehydration and the rate of bubble forming.
It is suitable to use high carbon content and low reaction speed to make carbon. When using the APP as a dehydrating catalyst, it should be used for the high thermal stability of pentaerythritol (PE) or dipentaerythritol (DPE), otherwise the ideal expansion carbon layer cannot be formed. If starch is used as a carbonization agent, before the application heat decomposition, starch has been decomposed and produced a large amount of tar, so it cannot form the ideal expansion body. In fact, PE is widely used as a carbonizer because PE is lower than DPE.
This kind of material can be heated by heat and decompose non-flammable gases (such as HCl, NH3, H2O, etc.), and the coating expands to form a spongy carbon layer. Commonly used foaming agent: melamine, dicyandiamide, chlorinated paraffin, etc., two or more foaming agent is used in fireproof coating, the effect is better.
Spell, for example, chlorine and phosphorus compounds, can not only from the solid phase to the gas phase is widely inhibit combustion, and because the chloride and phosphorus can produce synergies between the two elements, combustion generated when PCl3, POCl3 and other compounds, they become a gas at high temperatures, its density is greater than air, to adhere to the substrate surface and form a uniform coating, to separate air and fuel, thus achieve the goal of control or prevent burning.
In general, melamine (MEL) is selected as the main foaming agent, while chlorinated paraffin (CP) as plasticizer, as well as ammonium polyphosphate (APP) as the dehydrating catalyst, can also be used as a foaming agent.
Anyhow, constitute the expansion flame retardant system of dehydration catalyst, carbonation agent and foaming agent are short of one cannot, as the coating first, softening and melting, in case of fire and gas foaming agent decomposition, to soften the coating drum bubble expansion, the volume increase. At the same time, the dehydration catalyst decomposes free acid (such as phosphoric acid etc.), dehydrates polyols (such as pentaerythritol PE), and forms a carbonized layer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The selection principle of flame retardant flame retardant system and flame retardant is described in this paper.
An inflating coating used in flame retardant generally called expansion type flame retardant, fire retardant coating with the research of fire retardant coating from the expansion model to make the transition to inflating, the corresponding expansion type flame retardant and fire retardant coating from the expansion to the expansion type fire retardant system transition, and entered a stage of stable development.
In the research and application of expansion type flame retardant fire retardant coating, basically formed a P - C - N flame retardant system, the system according to its function including dehydration catalyst, carbonation agent and foaming agent, the points mentioned below.
As key components of fire retardant coating intumescent, dehydration catalyst's main purpose is to promote and improve the thermal decomposition process of coating and promote form three-dimensional carbonaceous non-flammable layer structure, reduce the thermal decomposition of combustible tar, the quantity of aldehydes and ketones; To promote the occurrence of non-combustible gas reactions. In the past, ammonium phosphate and dihydrogen phosphate were used as catalysts for dehydration, but they were eliminated in the late 1970s due to their high water solubility and low thermal stability.
Polyphosphate (APP), magnesium phosphate and melamine (MP) are now commonly used in the process of pyrolysis and dehydration of polyols. The APP is a good dewatering agent, which is the molecular formula (NH4)n+2PnO3n+ 1, and has been demonstrated by infrared spectroscopy and 31P nuclear magnetic resonance (NMR) that the structure is a chain polymer with no branched chain.
Experiments show that phosphate, poly phosphate salts, esters, amides, as long as it is in 100 - value = "250" UnitName = "℃ > 250 ℃ can be decomposed to produce the corresponding acid, can be used as dehydration catalyst.
In the study of fire retardant coating and industrial production, the factors such as water solubility, thermal stability, phosphorus content and raw material price should be taken into account, and then decide which dehydration catalyst to adopt.
Triisobutyl Phosphate(TIBP) is mainly used for antifoamer and penetrant. It is also be widely used in printing and dying, ink, construction, and oil field additives, etc. Another chemical name of Triisobutyl Phosphate (TIBP) is tri -butyl phosphate.
When the coating encounters flame or high temperature effect, in the action of the catalyst, the carbonized agent dehydrates carbonization form carbon layer. The effectiveness of the carbonizer is mainly determined by its carbon content and the number of hydroxyl groups. The carbon content in the carbonized agent determines the rate of carbonization, and the hydroxyl content determines the dehydration and the rate of bubble forming.
It is suitable to use high carbon content and low reaction speed to make carbon. When using the APP as a dehydrating catalyst, it should be used for the high thermal stability of pentaerythritol (PE) or dipentaerythritol (DPE), otherwise the ideal expansion carbon layer cannot be formed. If starch is used as a carbonization agent, before the application heat decomposition, starch has been decomposed and produced a large amount of tar, so it cannot form the ideal expansion body. In fact, PE is widely used as a carbonizer because PE is lower than DPE.
This kind of material can be heated by heat and decompose non-flammable gases (such as HCl, NH3, H2O, etc.), and the coating expands to form a spongy carbon layer. Commonly used foaming agent: melamine, dicyandiamide, chlorinated paraffin, etc., two or more foaming agent is used in fireproof coating, the effect is better.
Spell, for example, chlorine and phosphorus compounds, can not only from the solid phase to the gas phase is widely inhibit combustion, and because the chloride and phosphorus can produce synergies between the two elements, combustion generated when PCl3, POCl3 and other compounds, they become a gas at high temperatures, its density is greater than air, to adhere to the substrate surface and form a uniform coating, to separate air and fuel, thus achieve the goal of control or prevent burning.
In general, melamine (MEL) is selected as the main foaming agent, while chlorinated paraffin (CP) as plasticizer, as well as ammonium polyphosphate (APP) as the dehydrating catalyst, can also be used as a foaming agent.
Anyhow, constitute the expansion flame retardant system of dehydration catalyst, carbonation agent and foaming agent are short of one cannot, as the coating first, softening and melting, in case of fire and gas foaming agent decomposition, to soften the coating drum bubble expansion, the volume increase. At the same time, the dehydration catalyst decomposes free acid (such as phosphoric acid etc.), dehydrates polyols (such as pentaerythritol PE), and forms a carbonized layer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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