Preparation method of raspberry type pH value/temperature sensitive polymer microcapsules
A polymer and sensitive technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of uneven particle size of products, difficulty in obtaining nano or submicron microcapsules, etc., and achieve increased specific surface area and size Uniform size and stable performance
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Embodiment 1
[0030] 1. Preparation of polymethacrylic acid
[0031] Take 65mL of acetonitrile to a 100mL round bottom flask, add 15mL of MAA, add 0.060g of AIBN to start heating, and control to evaporate 40mL of acetonitrile in 1h to end the heating. After the product was cooled, the product was suction-filtered with a sand core funnel, and after being washed three times continuously with anhydrous acetonitrile, the particle size of the obtained PMAA microspheres was 1500 nm, and they were dispersed in 40 mL of anhydrous acetonitrile for subsequent use.
[0032] 2. Preparation of Silica Microspheres
[0033] Add 50mL of ethanol, 1mL of distilled water, and 1.1mL of concentrated ammonia water into a 100mL flask, stir at 25°C for 30min, add 1mL of TEOS, continue stirring for 5h, then add 0.05mL of APTES, and stir for 12 hours to end the reaction. Then centrifuge at 10000r / min for 10min, wash with ethanol until pH = 7, and obtain SiO with amino groups on the surface. 2 Microspheres, the par...
Embodiment 2
[0039] 1. Preparation of polymethacrylic acid
[0040] Take 70mL of acetonitrile into a 100ml round bottom flask, add 10mL of MAA, add 0.060g of AIBN to start heating, and control to evaporate 40mL of acetonitrile in 1h to end the heating. After the product is cooled, the product is suction-filtered with a sand core funnel, and after being washed three times continuously with anhydrous acetonitrile, the particle size of the obtained PMAA microspheres is 1000 nm, which is dispersed in 40 mL of anhydrous acetonitrile for subsequent use.
[0041] 2. Preparation of Silica Microspheres
[0042] Add 50mL of ethanol, 1mL of distilled water, and 1.1mL of concentrated ammonia water into a 100mL flask, stir at 25°C for 30min, add 1mL of TEOS, continue stirring for 5h, then add 0.05mL of APTES, and stir for 12 hours to end the reaction. Then centrifuge at 10000r / min for 10min, wash with ethanol until pH = 7, and obtain SiO2 microspheres with amino groups on the surface, the particle dia...
Embodiment 3
[0048] 1. Preparation of polymethacrylic acid
[0049] Take 75mL of acetonitrile into a 100ml round bottom flask, add 5mL of MAA, add 0.060g of AIBN to start heating, and control to evaporate 40mL of acetonitrile in 1h to end the heating. After the product is cooled, the product is suction-filtered with a sand core funnel, and after being washed three times continuously with anhydrous acetonitrile, the particle size of the obtained PMAA microspheres is 800nm, which is dispersed in 40mL of anhydrous acetonitrile for subsequent use.
[0050] 2. Preparation of Silica Microspheres
[0051] Add 50mL of ethanol, 1mL of distilled water, and 1.1mL of concentrated ammonia water into a 100mL flask, stir at 25°C for 30min, add 1mL of TEOS, continue stirring for 5h, then add 0.05mL of APTES, and stir for 12 hours to end the reaction. Then centrifuge at 10000r / min for 10min, wash with ethanol until pH = 7, and obtain SiO with amino groups on the surface. 2 Microspheres, the particle size...
PUM
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