Magnesium Hydroxide-Representative of Inorganic Flame Retardant Applications
With the development of polymer material industry, fiber, resin, chemical industry, construction, transportation, rubber and other synthetic materials are more and more, but most polymers are easy to burn materials, in many applications, in order to prevent fire, need to add flame retardant in polymer materials. Magnesium hydroxide is an important inorganic flame retardant, which has many advantages such as good thermal stability, no volatilization, no precipitation, no toxic gas, no pollution and so on. It is a kind of green environmental protection flame retardant, widely used in plastic, rubber, flame retardant and smoke and resin polymer materials. But it is a compound with extremely high surface properties, and the agglomeration between particles is serious.
With the development of polymer material industry, fiber, resin, chemical industry, construction, transportation, rubber and other synthetic materials are more and more, but most polymers are easy to burn materials, in many applications, in order to prevent fire, need to add flame retardant in polymer materials.Magnesium hydroxideIs an important inorganic flame retardant, its good thermal stability, non-volatile, non-precipitation, do not produce toxic gases, no pollution and many other advantages, is a green flame retardant, widely used in plastics, rubber, flame retardant and smoke and resin polymer materials.
However, it is a compound with extremely high surface properties. The agglomeration between particles is serious, and the compatibility with polymers is poor. The physical and mechanical properties of Yan Ying polymer are added to the assembly, and the processing performance deteriorates. In actual use, Magnesium hydroxide often needs to be modified before it can be used.
Flame retardant is an additive that can make the polymer less prone to ignition and slow down combustion. According to the classification of the elements contained in the flame retardant, it can be divided into organic and inorganic flame retardant. Organic flame retardants can be divided into halogen flame retardants (including chlorine and bromine) and nitrogen flame retardants; inorganic flame retardants include antimony compounds, phosphorus and phosphoric acid, boron compounds, magnesium hydroxide, zirconium compounds and bismuth compounds. With the development of science and technology and the improvement of people's awareness of environmental protection, the research and application of flame retardants in the world are developing in the direction of non-halogenated.
As a representative of the application of inorganic flame retardant, magnesium hydroxide is formed by chemical decomposition to absorb heat and dilute the mass fraction of oxygen in the air with hot water to form a flame retardant effect on the polymer. It is formed after the decomposition of the surface insulating layer of magnesium oxide. It has the chemical stability of non-toxic, smoke and decomposition product inhibition (alumina, magnesium oxide) series, so it does not produce secondary damage.
However, magnesium hydroxide still has the following confirmation in the current use process: first, the flame retardant efficiency is low, so it needs a higher concentration; second, it naturally presents hydrophilic and oleophobic surface properties, and it is difficult to uniformly disperse in organic polymers. Therefore, if the magnesium hydroxide powder is not used to fill the surface treatment of the polymer, the other properties of the polymer material (such as processing properties and mechanical properties) are seriously deteriorated.
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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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