Process for preparing aluminium hydroxide fire retardant
A technology of aluminum hydroxide flame retardant and aluminum hydroxide, which is applied in the direction of fire-resistant coatings, etc., can solve the problems of not being able to improve the thermal stability of aluminum hydroxide, achieve improved application range and use effect, increase stability, and improve mechanical properties Effect
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Embodiment 1
[0023] Using industrial sodium aluminate solution as raw material, firstly, the sodium aluminate solution is desiliconized and iron-removed with lime milk, the purification temperature is 90°C, the amount of lime added is 10g / l, and the reaction time is 0.5 hours. The purified aluminate The silicon content index of the sodium solution is 950, the alumina concentration is 154g / l, and the caustic ratio is α k Be 1.57; Add colloid kind (seed crystal d 50 = 4.5 μm), the variety seed ratio is 0.05, isothermally decomposed at 45°C, decomposed for 16 hours, and filtered to obtain d 50 Aluminum hydroxide micropowder of 1.02 μm; suspend and disperse the obtained aluminum hydroxide micropowder in water evenly, add 6% by weight of calcium chloride and 7% of ammonium bicarbonate and stir at room temperature for 1 hour to carry out inorganic coating Treatment: After filtering and drying, add NDZ-311 phosphorus-containing titanate according to the weight ratio of coupling agent to aluminum...
Embodiment 2
[0025] Obtain aluminum hydroxide micropowder according to the method in embodiment 1, the aluminum hydroxide micropowder obtained is suspended in water and dispersed evenly, add the calcium chloride of 8% water glass and 7% by weight and stir at room temperature for 1.5 hours, carry out inorganic Coating treatment; after filtering and drying, add NDZ-311 phosphorous-based titanate according to the weight ratio of coupling agent to aluminum hydroxide powder at 0.8%, stir at 75°C for 15 minutes at high speed, and carry out organic modification treatment , and then dried at 110°C, dispersed with a vibrating sieve to obtain the product of the present invention. The initial dehydration temperature of the treated product was measured to be 243°C.
Embodiment 3
[0027] Using industrial sodium aluminate solution as raw material, the sodium aluminate solution is first desiliconized and iron-removed with lime milk, the purification temperature is 98°C, the amount of lime added is 15g / l, and the reaction time is 1 hour. The purified aluminate The silicon content index of sodium solution is 1000, the alumina concentration is 150g / l, and the caustic ratio is α k is 1.60; add mechanical grinding active seed crystal (seed crystal d 50 = 1.2 μm), the crystal seed ratio is 0.08, isothermal decomposition is carried out at 50 °C, decomposed for 20 hours, and filtered to obtain d 50 Aluminum hydroxide micropowder of 5.6 μm; Suspend and disperse the obtained aluminum hydroxide micropowder in water evenly, first add 5% by weight water glass and 10% calcium chloride and stir at room temperature for 0.5 hours, then add bicarbonate Ammonia was stirred at room temperature for 1 hour to coat the surface of aluminum hydroxide powder with calcium silicate...
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