Method for preparing microspherical silica gel
A technology of silica gel and microspheres, applied in the direction of silica, silica, etc., can solve the problems that the specific surface area and pore volume of microsphere silica gel cannot be obtained, and achieve good technical effects
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Embodiment 1
[0014] 15% (weight, as SiO 2 (meter) of water glass and 10% (weight) of sulfuric acid are mixed in a mixer, and the pH of the mixed solution is 6.5 by adjusting the proportioning of the two materials, and the mixed solution is sprayed into the air to obtain a hydrogel, and the water is collected gel, then the hydrogel was washed with running water until the eluate was 1% AgNO 3 The aqueous solution showed a negative reaction, and then the hydrogel was transferred to an equal volume of 2-(sodiumsulfophenyl)ethylsiloxane aqueous solution with a weight concentration of 5%, adjusted to pH 8.0 with ammonia water, and soaked at room temperature for 3 hours. Then the temperature was raised to 90° C. and kept (ie, aged) for 24 hours. After filtering, the aged hydrogel was dried in a blast oven at 80°C for 8 hours, and then fired in a muffle furnace at 400°C for 4 hours. The specific surface area of the microsphere silica gel was measured to be 365 square meters per gram, and the p...
Embodiment 2
[0017] 15% (weight, as SiO 2 The water glass of meter) and the sulfuric acid of 10% (weight) are mixed in mixer, the pH of mixed solution is adjusted to be 7.0 by adjusting the proportioning of these two kinds of materials, mixed solution is sprayed in the air and obtains hydrogel, collects hydrogel, then the hydrogel was washed with running water until the eluate was 1% AgNO 3 The aqueous solution shows negative reaction, then the hydrogel is transferred to an equal volume of 30% 3-(sodium sulfonate) propylsiloxane aqueous solution, adjusted to pH6.0 with acetic acid and soaked at room temperature for 4 hours, then Raise the temperature to 40°C for aging for 48 hours. After filtering, the aged hydrogel was dried in a blast drying oven at 120°C for 8 hours, and then calcined in a muffle furnace at 600°C for 4 hours. The specific surface area of the microsphere silica gel was measured to be 384 square meters per gram, and the pore volume was 1.6 cubic centimeters per gram. ...
Embodiment 3
[0020] 15% (weight, as SiO 2 ) of water glass and 20% (weight) of sulfuric acid are mixed in a mixer, the pH of the mixed solution is 8.0 by adjusting the proportioning of the two materials, the mixed solution is sprayed into the air to obtain a hydrogel, and the water is collected gel, then the hydrogel was washed with water until the eluate was 1% AgNO 3 The aqueous solution showed a negative reaction, and then the hydrogel was transferred to an equal volume of 17% 3-(sodium sulfonate-2-hydroxyl-propoxyl) propylsiloxane aqueous solution, and adjusted to pH6. 0 and soak at room temperature for 5 hours, then heat up to 60°C and age for 12 hours. After filtering, the aged hydrogel was dried in a blast oven at 90°C for 8 hours, and then fired in a muffle furnace at 450°C for 4 hours. The specific surface area of the microsphere silica gel was measured to be 485 square meters per gram, and the pore volume was 1.5 cubic centimeters per gram.
[0021] For the convenience of co...
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