Mechanism of Flame Retardant and Smoke-eliminating of Magnesium Hydroxide
After the polymer is added with magnesium hydroxide flame retardant, it will release water in the process of thermal decomposition, and at the same time, it will absorb a large amount of latent heat, thereby reducing the actual temperature of the flame on the surface of the material, slowing down the speed of polymer degradation into low molecular weight, and reducing the production of combustible gas.
Polymer is added.Magnesium hydroxideAfter the flame retardant, it will release water in the process of thermal decomposition, and at the same time it will absorb a large amount of latent heat, thereby reducing the actual temperature of the flame on the surface of the material, slowing down the speed of polymer degradation into low molecular ground, and reducing the production of combustible gas.
Secondly, the large amount of water vapor released during the decomposition process will dilute the concentration of combustible gas and oxygen near the polymer surface, making surface combustion difficult.
Magnesium hydroxide helps to form a surface carbonization layer, thereby preventing the entry of oxygen and heat. The magnesium oxide generated by decomposition is also a good refractory material, which can improve the ability of polymer materials to resist flames, so as to achieve the purpose of isolating air from combustion. Due to the thermal decomposition of magnesium hydroxide can alleviate the three elements of combustion, play the role of flame retardant, once the fire source disappears, the combustion can be extinguished.
The decomposition temperature range of magnesium hydroxide is 350 ℃-490 ℃, which is significantly higher than the decomposition temperature of magnesium hydroxide 190 ℃-230 ℃, which basically meets the mixing processing and molding of various polymer materials, and avoids the decomposition of crystal water in the process of processing and molding, which affects the performance of the material. Magnesium hydroxide has good thermal stability and is relatively stable below 340 ℃. It starts to decompose endothermic when it reaches 340 ℃. When the temperature reaches about 430 ℃, the decomposition rate is the highest, and it ends when it reaches 490 ℃.
Real-time information
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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
Comprehensive department Telephone:0551-67712199
Company headquarters address: Hefei Feidong Economic Development Zone Xianghe Road 36
E-mail:hefei@zkxcl.com
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