Method for preparing aluminum hydroxide composite fire retardant
A composite flame retardant, aluminum hydroxide technology, applied in chemical instruments and methods, magnesium compounds, aluminum compounds, etc., can solve the problem of low thermal decomposition temperature, improve processing performance, broaden the application range, and improve thermal stability Effect
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[0022] A preparation method of aluminum magnesium hydroxide composite flame retardant. The preparation process is to add acidic magnesium salt solution to active ultrafine aluminum hydroxide crystal nuclei and the mother liquor in the production process of aluminum oxide to react, and to react on the surface of aluminum hydroxide After the magnesium hydroxide coating layer is formed, the aluminum magnesium hydroxide composite powder is obtained through liquid-solid separation, washing, drying and dispersing. The specific operation steps are:
[0023] (1) Make industrial acid magnesium salt (magnesium chloride or magnesium sulfate or magnesium nitrate) into solutions with soft water, and then filter with alumina or zirconia microfiltration membrane, and the filtrate is used to prepare aluminum-magnesium composite flame retardant If industrial sodium hydroxide is used instead of the mother liquor as the reaction raw material, it is also necessary to make industrial sodium hydrox...
Embodiment 1
[0031] Preparation of High Thermal Stability Al-Mg Composite Flame Retardant Using Wet Filter Cake, Sintering Mother Liquor and Magnesium Chloride as Raw Materials
[0032]The average particle size is 17Kg (moisture content 40%) of superfine aluminum hydroxide wet filter cake of 1.5 μm, puts in the stainless steel reaction tank of 200L, the mass ratio of sodium hydroxide and aluminum hydroxide is 0.07, adds 8.92 liters and contains concentration and is 2mol / L of mother liquor of sodium hydroxide, then add 86.3 liters of soft water, the solid content of the aluminum hydroxide slurry is about 100g / L, stir fully to suspend all the aluminum hydroxide, raise the temperature to 70°C, and let the temperature in the tank The temperature is stabilized at about 70°C, and 6L of industrial magnesium chloride solution with a concentration of 1.5mol / L (the magnesium chloride solution is purified by alumina ceramic microfiltration membrane) is added to the stainless steel tank at a feeding r...
Embodiment 2
[0034] Preparation of High Thermal Stability Al-Mg Composite Flame Retardant Using Wet Filter Cake, Sintering Mother Liquor and Magnesium Nitrate as Raw Materials
[0035] The ultra-fine aluminum hydroxide decomposed from the sodium aluminate solution is separated from the liquid and solid by a belt filter to obtain an average particle size of 1.5 μm ultra-fine aluminum hydroxide wet filter cake 25Kg (water content 40%), put into 200L stainless steel In the reaction tank, add 13.1 liters of mother liquor containing 6mol / L sodium hydroxide, the mass ratio of sodium hydroxide to aluminum hydroxide is 0.21, then add 36.9 liters of soft water, the solid content of the aluminum hydroxide slurry is 250g / L, Stir fully to suspend all the aluminum hydroxide, raise the temperature to 90°C, stabilize the temperature in the tank at about 90°C through a temperature controller, and put 19.65L of magnesium nitrate solution with a concentration of 2mol / L (magnesium nitrate solution passed thro...
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