A method for preparing a multi-channel asymmetric structure pure silicon carbide membrane
An asymmetric structure and silicon carbide membrane technology, which is applied in the field of membrane separation materials and inorganic membrane separation materials, can solve the problems of high sintering temperature of pure silicon carbide membrane, low purity of silicon carbide filter material, and insufficient mechanical strength, etc., and achieve reduction The effect of membrane shell and seal quantity, flexible flow speed and flow time, increasing filtration flux and stability
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Embodiment 1
[0036] Blend 50-100 μm silicon carbide particles, polysiloxane, carboxymethyl cellulose, phenolic resin, and polyethyleneimine in toluene at a mass percentage ratio of 65:12:19.5:3:0.5, and the toluene content accounts for the total 30wt% of the weight, after being mechanically stirred, ball milled for 0.5 hours to get a thick slurry, and then put into the mud mill to squeeze and knead for 30min to form a more evenly mixed slurry with good plasticity. Put the above slurry into the extruder. The head of the extruder adopts a 31-hole multi-channel mold with an outer circle and an inner circle. The extrusion pressure is controlled at 5MPa, the extrusion speed is 10mm / s, and the exit of the extruder is dried by infrared. The device quickly dries and finalizes the shape, adopts a high-temperature resistant graphite tray to accept the embryo body, and controls the extrusion length of the embryo body to 500mm; the preliminary formed embryo body is transferred to the drying room for dr...
Embodiment 2
[0043] The difference from Example 1 is:
[0044] Mix 8 μm silicon carbide particles with polysiloxane, carboxymethyl cellulose, polyethyleneimine and ethanol according to the mass percentage of 18:5:9:3:65, and stir them evenly to form No. 1 with good fluidity slurry. Put the multi-channel asymmetric structure pure silicon carbide film substrate into the vertical pipe, and the two ends of the substrate are sealed and fixed by the sealing ring, so that only the channels in the substrate are in contact with the slurry in the pipe, and then the slurry is separated by gravity. No. 1 slurry passes through the pipeline at a certain speed, and lasts for a certain period of time, and coats a layer of slurry on both ends of the substrate and internal passages to indicate the attached figure 2 ;The coated substrate is sintered in a sintering furnace after drying. The heating rate is 6°C / min. First, the temperature is raised to 300°C, and the temperature is kept for 60 minutes; Then, ...
Embodiment 3
[0048] The difference from Example 1 is:
[0049] Mix 0.2 μm silicon carbide particles with polysiloxane, carboxymethyl cellulose, phenolic resin, and polyethyleneimine according to the mass percentage of 21:4:8:5:62, and stir them evenly to form a good fluidity No. 3 slurry; coating on the multi-channel asymmetric structure pure silicon carbide film of the 2-layer filter layer in Example 1, the substrate after coating enters the sintering furnace for sintering after being dried, and the heating rate is 4 ℃ / min, first raise the temperature to 250°C, and keep it for 30 minutes; then raise the temperature to 800°C at a heating rate of 3°C / min, and keep it for 90 minutes; The furnace was naturally cooled to room temperature, and a multi-channel asymmetric structure pure silicon carbide membrane with three filter layers was obtained.
[0050] Such as figure 1As shown, the pure silicon carbide membrane with multi-channel asymmetric structure is a circular tubular membrane, the ...
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