Method for preparing modified magnesium hydroxide flame retardant from salt lake produced light-burned active magnesium oxide
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A technology of active magnesium oxide and magnesium hydroxide, applied in magnesium hydroxide and other directions, can solve the problems of complex process, high cost, and harm to the health of production workers.
Pending Publication Date: 2021-07-06
WESTERN MINING GROUP +2
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[0007] The technical process of this kind of scheme is complicated, there are many kinds of procedures and raw materials, high cost, long time-consuming, and waste liquid such as ammonium sulfate or s
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Embodiment 1
[0037]Add 150mL deionized water into the reaction kettle, weigh 20g of high-activity light-burned magnesia produced in Salt Lake, add it, stir evenly, add 4.26g stearic acid (3% of the molar weight of magnesia), and stir at 450r / min , heat up to 145°C, keep warm for 8 hours, stop heating, cool to room temperature, filter with suction, wash with deionized water, and dry in an oven at 60°C to obtain hexagonal flaky stearic acid-modified white magnesium hydroxide powder.
Embodiment 2
[0039] Add 150mL deionized water into the reaction kettle, weigh 20g of high-activity light-burned magnesium oxide produced in Salt Lake, add it, stir evenly, add 1.52g of sodium oleate (1% of the molar weight of magnesium oxide), and stir at 300r / min , heat up to 160°C, keep warm for 10h, stop heating, cool to room temperature, filter with suction, wash with deionized water, and dry in an oven at 60°C to obtain white magnesium hydroxide powder modified with hexagonal oleic acid.
Embodiment 3
[0041] Add 150mL deionized water into the reaction kettle, weigh 20g of high-activity light-burned magnesia produced in Salt Lake, add it, stir evenly, add 2.07g of N308 silane (1.5% of the molar weight of magnesia), and stir under 500r / min , heat up to 95°C, keep warm for 5h, stop heating, cool to room temperature, filter with suction, wash with deionized water, and dry in an oven at 60°C to obtain white magnesium hydroxide powder modified with hexagonal oleic acid.
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Abstract
The invention discloses a method for preparing a modified magnesium hydroxide flame retardant from salt lake produced light-burned active magnesium oxide. The method comprises the following steps: adding a proper amount of deionized water into a reaction kettle, weighing the salt lake produced light-burned active magnesium oxide as a raw material, adding the weighed salt lake produced light-burned active magnesium oxide into the reaction kettle, uniformly stirring, weighing a modifier according to the amount (molar ratio) of 1-3% of magnesium oxide, adding the modifier into the reaction kettle, and reacting for a specified time at a certain temperature and a certain stirring speed; and filtering, washing and drying the reaction product to obtain the hexagonal flaky modified magnesium hydroxide flame retardant. The salt lake produced light calcined magnesia is used as a raw material, stearic acid, sodium stearate, oleic acid, sodium oleate and silane are used as modifiers, the process is simple, the needed raw materials are few in variety, the production cost is low, and the obtained hexagonal flaky oily magnesium hydroxide is high in purity and good in compatibility with high polymer materials and has great application value and market value.
Description
technical field [0001] The invention relates to the technical field of preparation of magnesium hydroxide flame retardants, in particular to a method for preparing magnesium hydroxide for flame retardants with lightly burned magnesium oxide. Background technique [0002] Qinghai's salt lake resources are very rich, and it is the largest resource in Qinghai Province. In 2020, Qinghai's potash fertilizer production has reached a scale of nearly 8 million tons per year. However, with the steady advancement of the development and comprehensive utilization of potassium resources in salt lakes, a large amount of magnesium-rich tail salt (bischlorite) is produced. Relevant data show that for every ton of potassium chloride produced, 8-10 tons of magnesium chloride will be produced incidentally. Therefore, how to develop magnesium resources more effectively has become an important part of the green economic development of the salt lake industry. [0003] Magnesium hydroxide, as an...
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