The Research Of Magnesium Hydroxide Flame Retardants Dispersion

With the enhancement of national laws provisions and people’s awareness of environmental protection, magnesium hydroxide flame retardant gets enthusiastic attention. In recent years, its study has also been widely concerned. magnesium hydroxide flame retardant has so many advantages, such as raw materials, non-polluting, high decomposition temperature and flame retardant product with isolated objects, and while both flame retardant and smoke suppression, that it is applied by people. However, the current domestic magnesium hydroxide flame retardant needs adding a lot to play good results. The technology lags far behind those developed countries, so the development of research needs innovation.This paper mainly studied the Magnesium Hydroxide(Mg(OH)2) flame retardant that was made by Magnesite production from Tibet. Researching magnesite calcination temperature and soaking time affected the activity of magnesium oxide(MgO).when the Magnesite production calcined at 800 ℃ and held two hours,its activity was the highest,up to 94%.The highest activity of MgO hydration was directly hydrated to generate magnesium hydroxide, which was used to develop flame retardant. Depending on the kind of surfactant,additive and anionic compound with modification, Mg(OH)2 was modified in the experiment. Meanwhile, the factors of adding volume, temperature, time, magnesium hydroxide particle size having effects on the dispersibility needed considering. According to the determination of light transmittance and Zeta potential, the anionic modification in the surfactant species were the best. Its dispersion effect of 6% amount,65℃ temperature and 60 minutes time reached the best. Respectively selecting three types of the inorganic additives and organic additives in the additive experiment, the addition of inorganic additive sodium hydroxide to improve flame retardant’s dispersion was the most helpful. The flame retardant whose effect reached the best was made under the additive amount of 0.1g,mixing temperature 60℃ and 60 minutes mixing time. In the process of studying anionic complex formulation, the combination of selecting sodium dodecyl benzene sulfonate and sodium octadecyl was the best. The adding amount was 6%, the reaction temperature was 70 ℃,and reaction time was 60 minutes. Two the proportion of complex surfactants octadecyl sulfate and sodium dodecyl benzene sulfonate was 1: 2, and the raw material of magnesium hydroxide particle size was 200 mesh, which could obtain optimum dispersion of flame retardant. Using X- ray diffraction, infrared spectroscopy and electrophoresis discussed the modification mechanism. And using scanning electron microscopy and particle size analyzer obtained a sample size.