Talking about the flame retardant effect of magnesium hydroxide?
Magnesium hydroxide is a flame retardant, specific flame retardant effect is what kind. Magnesium hydroxide at 340 ℃ ~ 490 ℃ conversion, endothermic energy of 187cal/g. The average temperature of the initial conversion of magnesium hydroxide is much higher than that of hydrated alumina, the heat stability is good, and it has excellent flame retardant grade and smoke removal effect, which is very suitable for the production and processing of polyolefin plastic products with high average temperature.
Magnesium hydroxideIs a kind of flame retardant, specific flame retardant effect is what kind of? The following will give you a detailed introduction.
Magnesium hydroxide at 340 ℃ ~ 490 ℃ conversion, endothermic energy of 187cal/g. The average temperature of the initial conversion of magnesium hydroxide is much higher than that of hydrated alumina, the heat stability is good, and it has excellent flame retardant grade and smoke removal effect, which is very suitable for the production and processing of polyolefin plastic products with high average temperature. When Mg(OH)2 is applied to PP (the addition amount exceeds 50%), it has excellent flame retardant grade effect. When Mg(OH)2 is applied to PE, its flame retardant grade effect is stronger than AI(OH)3. This is because magnesium hydroxide not only realizes the dehydration chemical reaction when it is ignited, but also has a corresponding carbonization effect on the polymer to produce a protective layer, which has the effect of flame retardant grade.
Under the same addition amount, the flame retardant grade effect difference between different proportions of aluminum hydroxide and magnesium hydroxide is not significant, but the combined application of the two types is better than the direct application effect, because although both require dehydration chemical reaction, there are differences in the average conversion temperature and endothermic energy. Magnesium hydroxide requires a higher average temperature for dehydration and at the same time has a carbonization effect. However, the heat absorption energy of magnesium hydroxide is correspondingly smaller. Since the effect of controlling the average temperature rise of the material is not as good as that of aluminum hydroxide, the combined application of the two can fill each other, and its flame retardant grade is better than that of direct application.
Magnesium hydroxide has a relatively good smoke suppression effect. The beginning time of smoking of PP specimens containing Mg(OH)2 is significantly delayed, and its smoke emission and smoke emission after 4min are much lower than those of PP specimens containing halide/Sb2O3. For this reason, Mg(OH)2 is a smoke-removing filler for PP under the standard of moderate addition. Mg(OH)2 has poor acid resistance, will melt rapidly in acid, and is also very vulnerable to interference by lactic acid, thus leaving fingerprints on the surface of the product. In order to get rid of the defects of Mg(OH)2 dispersion and poor compatibility, it is necessary to develop and design excellent varieties with good compatibility. The method of improving crystal size distribution and aggregation reaction characteristics can be selected, and the method of surface treatment can also be realized by using unsaturated higher fatty acids, saturated fats and multi-components with excellent thermal conductivity.
The principle of flame retardant grade of magnesium hydroxide shows that when magnesium hydroxide is heated (340-490 degrees), it generates heat energy on the surface of the converted adsorbed combustion substance, which has flame retardant grade effect; At the same time, a lot of water vapor is released to dilute the oxygen on the surface of the combustible substance, and the converted active magnesium oxide adheres to the surface of the combustible substance, further blocking the realization of ignition.
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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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