Preparation method of macropore mayenite block body
A macroporous calcium-aluminum and stone technology is applied in the field of preparation of mayenite block materials to achieve the effects of high porosity, simple preparation process and reduced preparation cost
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Embodiment 1-1
[0025] Embodiment 1-1, a method for preparing a macroporous mayenite block, the following steps are performed in sequence:
[0026] 1), at room temperature, dissolve 0.6 g of polyvinylpyrrolidone as a phase separation inducer in a mixed solvent composed of 2.5 g of water and 3.5 g of ethanol (absolute ethanol), and after magnetic stirring, add nine 1.0g of aluminum nitrate hydrate and 0.6g of calcium nitrate tetrahydrate, 0.1ml of polystyrene microspheres (particle size: 50-100nm) as a template agent and 0.3ml of ethylene glycol as a chelating agent and stir for 50-70min, after stirring evenly Add 2.5ml of propylene oxide as a gel accelerator, ultrasonic (frequency 53KHz, output power 100%, water temperature 20°C) for 10-20 seconds to obtain a homogeneous solution;
[0027] 2), put the homogeneous solution obtained in step 1) in an airtight container, and react in an oven at 35-45°C for 24 hours;
[0028] 3) The aged gel obtained in step 2) is dried in a vacuum environment (v...
Embodiment 1-2
[0031] The phase separation inducer polyvinylpyrrolidone in step 1) of Example 1-1 was changed from 0.6 g to 0.2 g; the rest were the same as in Example 1-1.
[0032] Observation by scanning electron microscope at low magnification and high magnification, mayenite still has a coherent macroporous structure at the same time, but with the decrease of polyvinylpyrrolidone amount, the macropore diameter decreases as ( figure 2 , the pore size is about 0.2 μm), which is due to the weakening of the phase separation effect of polyvinylpyrrolidone. According to the mercury intrusion test, the porosity of the macroporous mayenite block prepared in this embodiment is 64%.
Embodiment 1-3
[0034] The phase separation inducer polyvinylpyrrolidone in step 1) of Example 1-1 was changed from 0.6 g to 1.5 g; the rest were the same as in Example 1-1.
[0035] The microscopic morphology of the mayenite block has changed to the accumulation of mayenite particles by scanning electron microscopy at low and high magnifications, that is, it does not present a coherent macropore structure, such as image 3 , this is because with the increase of the amount of polyvinylpyrrolidone, the phase separation effect of polyvinylpyrrolidone is further enhanced, and excessive phase separation occurs. The porosity is 56% according to the mercury intrusion test.
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