Hollow micro-capsule and preparing method and application thereof
A microcapsule and hollow technology, which is applied in the field of composite materials, can solve problems such as low mechanical strength, environmental protection, and easy breakage, and achieve the effects of easy degradation, uniform shape, and narrow particle size distribution
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[0037] In order to solve the problems in the prior art that the prepared hollow microcapsules have uneven shape and particle size, low mechanical strength and easy to break, and the preparation method is not environmentally friendly, the present invention provides a hollow microcapsule and its preparation method and application , the hollow microcapsules are self-assembled layer by layer by using mesoporous silica with a positive charge on the surface as a template, alternately coating carboxymethyl cellulose and chitosan with a positive charge on the surface, and finally removing the template after getting.
[0038] In a preferred embodiment of the present invention, the pore diameter of the mesoporous silica is 3-5 nm.
[0039] In a preferred embodiment of the present invention, the pore volume of the mesoporous silica is 0.3-1 cm 3 / g, more preferably 0.5-0.9cm 3 / g.
[0040] In a preferred embodiment of the present invention, the preparation method of the above-mentione...
Embodiment 1
[0060] 1. Preparation of mesoporous silica: Dissolve 2g of surfactant cetyltrimethylammonium bromide (CTAB) in a mixture of 100g of absolute ethanol and 288g of deionized water, and then add 25% to 28 % ammonia water 16g, stirred at room temperature for 30min to form a clear and transparent solution; added 0.8g tetraethyl orthosilicate to the solution, stirred vigorously for 4 hours, and added 0.8g orthosilicate dropwise to the solution every hour for the next 7 hours Acid ethyl ester, and then continue to stir the reaction for 8h. After the reaction, the obtained liquid was centrifuged at 6000r / min for 15min; the white precipitate was taken, washed with deionized water and ethanol in sequence, and centrifuged to obtain a white solid powder; 1 g of the white solid powder was dissolved in 10ml deionized water, 150ml absolute ethanol and In a mixed solution of 1g of ammonium nitrate, reflux at 60°C for 12h to extract the template agent CTAB, centrifuge, repeat the extraction ope...
Embodiment 2
[0072] 1. Preparation of mesoporous silica: Dissolve 4g of surfactant cetyltrimethylammonium bromide (CTAB) in a mixture of 100g of absolute ethanol and 288g of deionized water, and then add 25% to 28 % ammonia water 16g, stirred at room temperature for 30min to form a clear and transparent solution; added 0.8g tetraethyl orthosilicate to the solution, stirred vigorously for 6 hours, and added 0.8g orthosilicate dropwise to the solution every hour for the next 7 hours Acid ethyl ester, and then continue to stir the reaction for 8h. After the reaction, the obtained liquid was centrifuged at 6000r / min for 15min; the white precipitate was taken, washed with deionized water and ethanol in sequence, and centrifuged to obtain a white solid powder; 1 g of the white solid powder was dissolved in 10ml deionized water, 150ml absolute ethanol and In a mixed solution of 1.5g ammonium nitrate, reflux at 60°C for 12h to extract the template agent CTAB, centrifuge, repeat the extraction oper...
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