How much do you know about the functional characteristics of phosphorus-based flame retardants?
Due to its own characteristics and performance, phosphorus flame retardant has been used as a flame retardant for a long time. It not only overcomes the shortcomings of large amount of smoke and release of toxic and corrosive gases during combustion of halogen flame retardant, but also improves the shortcomings of high addition amount of inorganic flame retardant and seriously affects the physical and mechanical properties of materials. Its flame retardant effect is excellent, low smoke, low toxicity, no corrosive gas generation, and has been widely used.
Due to its own characteristics and performance of phosphorus flame retardants have long been usedflame retardantIt not only overcomes the shortcomings of large amount of smoke and release of toxic and corrosive gases during combustion of halogen flame retardants, but also improves the shortcomings of high addition amount of inorganic flame retardants that seriously affect the physical and mechanical properties of materials. Its flame retardant effect is excellent, low smoke, low toxicity, no corrosive gas generation, and has been widely used.
Phosphorus flame retardant is mainly through the material and oxidant, heat source between the formation of isolation film to achieve flame retardant effect. According to the different flame retardant effect of phosphorus compounds in different reaction zones, the flame retardant mechanism can be divided into condensed phase flame retardant mechanism and gas phase flame retardant mechanism. During combustion, phosphorus-based flame retardants are decomposed into phosphorus oxyacids (phosphoric acid, metaphosphoric acid, polymetaphosphoric acid, etc.) by heat, which have strong dehydration property and can dehydrate and carbonize materials into films, thus reducing combustible products. At the same time, phosphorus oxyacids are mostly viscous semi-solid substances, which can form a layer of glassy melt covering the coke layer on the surface of the material to reduce the air permeability of the carbon layer, the carbon layer is protected from continued oxidation and the spread of combustion is inhibited. Phosphorus flame retardant is a kind of free radical scavenger, in the combustion of the formation of PO radical, can be combined with the flame of H radical, so that the phosphorus flame retardant in the gas phase also play a flame retardant effect. In addition, the moisture generated by the phosphorus-based flame retardant during the flame retardant process can not only reduce the temperature of the condensed phase, but also dilute the concentration of combustibles in the gas phase, thereby achieving a good flame retardant effect.
Inorganic phosphorus flame retardants mainly include red phosphorus (microencapsulated red phosphorus), ammonium polyphosphate and phosphate (such as diammonium hydrogen phosphate, ammonium dihydrogen phosphate, ammonium phosphate, etc.). Phosphorus-containing inorganic flame retardants are widely used because of their good thermal stability, non-volatile, non-corrosive gas, long-lasting effect and low toxicity.
Organic phosphorus flame retardants mainly include trisphenol phosphate, xylene phosphate, butylbenzene phosphate, etc. Phosphate esters are characterized by flame retardant and plasticizing dual functions.
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Everyone knows that there are two common flame retardants. Today we are going to talk about only one of them. Aluminum hydroxide flame retardant is an environmentally friendly halogen-free flame retardant, which can be widely used in fabrics, wood, plastics, and rubber., Polyurethane and other industries have ideal flame retardant effect. In the process of industrial application, it is found that flame retardant failure occurs when aluminum hydroxide flame retardant is added. The following are the reasons for the failure of aluminum hydroxide flame retardant, how to prevent it, how to deal with the operation, and restore the original function.
As a flame retardant, magnesium hydroxide also need to improve what aspects?
When it comes to flame retardants, everyone is familiar with them. Although we usually have less contact with them, we can know what they are used for from the name. Have to talk about magnesium hydroxide, we all know that its main presentation state is a granular, at present, the market sales of magnesium hydroxide particle size is larger, part of the commodity particle size up to tens of microns, immediately used as a flame retardant, poor dispersion, the physical properties of raw materials greater harm. In industrial production, physical grinding methods are generally used to reduce the particle size to 1 micron. The surface of magnesium hydroxide has high polarity and is easy to agglomerate. As the compatibility of refractory materials and polymer substrates, it not only reduces its flame retardant grade, but also causes more serious harm to the physical properties of raw materials.
Hefei Zhongke Flame Retardant New Material Co., Ltd
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Ministry of Foreign Trade Telephone:13956052398
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