Two-step preparation method of hollow silica particles
A silicon dioxide and particle technology, applied in the field of preparation of hollow silicon dioxide particles, can solve the problems of affecting the application performance of hollow silicon dioxide particles, environmental pollution, increase production costs, etc., to simplify the post-processing process and reduce production costs. , the effect of reducing the impact
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Embodiment 1
[0017] Add 5 parts of 25% ammonia water and 90 parts of distilled water into the flask, and heat the above solution to 25° C. in a water bath. Under stirring, slowly add the first batch of 0.06 parts of tetraethyl orthosilicate dropwise to the flask, finish adding within 30 minutes, continue to react for 5 minutes, then add the remaining 2.94 parts of tetraethyl orthosilicate to the above system, Keep the temperature constant, and react under stirring for 7 hours. The product was washed by centrifugation with distilled water, and dried under vacuum at 60°C to obtain hollow silica particles. Observed under a transmission electron microscope, it is a hollow particle with a particle size of 200-800nm and a shell thickness of about 18nm.
Embodiment 2
[0019] Add 5 parts of 25% ammonia water and 90 parts of distilled water into the flask, and heat the above solution to 50° C. in a water bath. Under stirring, slowly add the first batch of 0.1 parts of ethyl orthosilicate dropwise to the flask, and finish adding within 50 minutes, and continue to react for 10 minutes, then, add the remaining 2.9 parts of ethyl orthosilicate to the above system, Keep the temperature constant, and react under stirring for 5 hours. The product was washed by centrifugation with distilled water, and dried under vacuum at 60°C to obtain hollow silica particles. Observed under a transmission electron microscope, it is a hollow particle with a particle size of 200-800nm and a shell thickness of about 33nm.
Embodiment 3
[0021] Add 5 parts of 25% ammonia water and 90 parts of distilled water into the flask, and heat the above solution to 75° C. in a water bath. Under stirring, slowly add the first batch of 0.6 parts of ethyl orthosilicate dropwise to the flask, and finish adding within 30 minutes, and continue to react for 5 minutes, then, add the remaining 2.4 parts of ethyl orthosilicate to the above system, Keep the temperature constant, and react under stirring for 5 hours. The product was washed by centrifugation with distilled water, and dried under vacuum at 60°C to obtain hollow silica particles. Observed under a transmission electron microscope, it is a hollow particle with a particle size of 200-800nm and a shell thickness of about 50nm.
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