Magnesium Hydroxide for Smoke Suppressant

When Mg(OH)2 is used in PP (adding amount is more than 50%), it has good flame retardant effect. When Mg(OH)2 is used in PE, its flame retardant effect is better than that of Al(OH)3. This is because magnesium hydroxide not only performs dehydration when it is burned, but also has a certain carbonization effect on the polymer [16], forming a protective layer and playing a flame-retardant role. Under the same filling amount, the difference of flame retardant effect between different aluminum hydroxide and magnesium hydroxide is not obvious, but the two kinds of composite use are better than the single use effect, because although they are all dehydration reactions, the decomposition temperature and the absorption There is a difference in calories. Magnesium hydroxide needs to be dehydrated at a higher temperature and has a carbonization effect at the same time. The heat absorption of magnesium hydroxide is relatively small, because the effect of suppressing the temperature rise of the material is not as good as that of aluminum hydroxide, and the two combined use can supplement each other, and the flame retardant performance is better than that of the single use. Magnesium hydroxide has a good effect of suppressing smoke. The starting time of smoking of PP sample containing Mg(OH)2 was significantly delayed. The maximum amount of smoke emitted and the amount of smoke after 4 minutes were lower than that of halide/Sb2O3. The sample is much lower. Therefore, Mg(OH)2 is a highly effective smoke-removing filler for PP under the appropriate addition amount.Mg(OH)2%97.5CaO/% ≤0.1insoluble/% ≤0.1water/% ≤0.5Cl/% ≤0.1Fe/% ≤0.005particle size0.5~1.5whiteness≥95