Method for preparing plate-like basic magnesium carbonate by template induction/homogeneous precipitation
A homogeneous precipitation and magnesium carbonate technology, which is applied in the field of fire prevention and materials, can solve problems such as agglomeration, limit the application of basic magnesium carbonate, and complicated preparation methods, and achieve the effects of improving performance, reducing safety hazards, and good flame retardancy
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Embodiment 1
[0023] 1. Weigh 2.0714g of MgCl 2 ·6H 2 O (purity: 98%) was dissolved in 25 ml of distilled water, and 0.5 mol / L dilute hydrochloric acid was added dropwise until pH=3.
[0024] 2. Weigh 1.212g of urea (purity: 99%) and 0.2071g of tetrahydrofuran, and dissolve them in the above solution.
[0025] 3. Transfer the solution obtained above to the reaction kettle, and pour a small amount of distilled water after rinsing the beaker into the reaction kettle.
[0026] 4. After sealing the reaction kettle, put it into a constant temperature water bath at 100°C, react for 8 hours, age for 5 hours, vacuum filter, and dry at 90°C for 4 hours to obtain plate-shaped basic magnesium carbonate.
[0027] Plate-shaped Mg prepared under the above conditions 5 (CO 3 ) 4 (OH) 2 4H 2 The XRD diffraction pattern of O is shown in figure 1 . By comparing with the standard PDF card, the peak position and relative signal intensity of the sample are basically consistent with the standard diffrac...
Embodiment 2
[0029] 1. Weigh 3.6250g of MgCl 2 ·6H 2 O (purity is 98%), add 25ml of distilled water to dissolve, add 0.5mol / L dilute hydrochloric acid drop by drop until pH=3;
[0030] 2. Weigh 3.1818g urea (99% purity) and 0.3625g dimethyl sulfoxide, and dissolve them in the above solution;
[0031] 3. Transfer the solution obtained above to the reactor, and pour a small amount of distilled water after rinsing the beaker into the reactor;
[0032] 4. After sealing the reaction kettle, put it into a constant temperature water bath at 100°C, react for 16 hours, age for 5 hours, vacuum filter, and dry at 90°C for 4 hours to obtain plate-shaped basic magnesium carbonate.
[0033] The Mg obtained in Example 2 5 (CO 3 ) 4 (OH) 2 4H 2 SEM photo of O ( image 3 a) with figure 2 There are obvious differences, but the photos under high magnification ( image 3 b) It can be seen from observation that the crystal is formed by stacking multi-layer sheets. The reason for this result is larg...
Embodiment 3
[0035] 1. Weigh 5.1786g of MgCl 2 ·6H 2 O (purity is 98%), add 25ml of distilled water to dissolve, add 0.5mol / L dilute hydrochloric acid drop by drop until pH=3;
[0036] 2. Weigh 6.0606g of urea (99% purity) and 0.5179g of ethylenediaminetetraacetic acid, and dissolve them in the above solution;
[0037] 3. Transfer the solution obtained above to the reactor, and pour a small amount of distilled water after rinsing the beaker into the reactor;
[0038] 4. After the reaction kettle is sealed, put it into a constant temperature water bath at 100°C, react for 24 hours, age for 5 hours, vacuum filter, and dry at 90°C for 4 hours to obtain plate-shaped basic magnesium carbonate.
[0039] from Figure 4 As can be seen from the shown SEM photographs, the flaky basic magnesium carbonate prepared under the conditions of Example 3, as time increases, the crystal growth is more complete, and the smoothness of the crystal plane is enhanced.
[0040] It can be seen from the above exa...
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