Polylactic acid-polyethylene glycol block copolymer-based magnetic microsphere preparation method
A technology of block copolymer and polyethylene glycol, which is applied in the field of preparation of magnetic microspheres, can solve the problems of weak magnetic response, low coating rate of magnetic polymer microspheres, uneven particle size distribution, etc., and achieve reduction Agglomeration, wide application range, smooth surface effect
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[0023] Implementation example 1:
[0024] 1. Modification of magnetic ferroferric oxide
[0025] (1) Disperse 1.0 g of ferroferric oxide ultrasonically in 100 mL of deionized water, then transfer the ferroferric oxide suspension to a 250 mL three-necked flask, and use 10% hydrochloric acid solution (about 9-10 drops) Adjust the pH value of the ferroferric oxide suspension to 5.5-6.0, put it in a constant temperature water bath at 80°C while stirring (500r / min) while adding 0.15g sodium oleate, stirring for 1-1.5h, and then adding 0.05g Polyethylene glycol, continue to stir and react for 1 hour and then cool to room temperature, and then adjust the pH of the solution to 7 with 10% NaOH solution (about 5-6 drops).
[0026] (2) Put the solution on a multi-purpose magnetic analyzer for rapid solid-liquid separation, wash it with deionized water and absolute ethanol for 2 to 3 times to wash off excess oleic acid on the surface, filter with suction, and dry for later use.
[0027] 2. Prepa...
Example Embodiment
[0033] Implementation example 2:
[0034] 1. Modification of magnetic ferroferric oxide: same as above
[0035] 2. Preparation of oil-in-water emulsion
[0036] (1) Dissolve 1.0 g of polylactic acid-polyethylene glycol block copolymer (PLA-PEG-PLA) with a molecular weight of 10,000 in 15 mL of dichloromethane and acetone (V acetone / V CH2Cl2 = 1:2) In the mixed solution, add 0.1g modified ferroferric oxide, and ultrasonically disperse to obtain the oil phase;
[0037] (2) 1.0g of polyvinyl alcohol is heated at 95°C and stirred at 500r / min for 1 hour and dissolved in 100mL of deionized water to obtain an aqueous phase;
[0038] (3) Slowly add the organic phase to the water phase with stirring at room temperature. When the temperature is 60℃, use a high-speed dispersing homogenizer 12000r / min to emulsify and disperse for 3-5min to obtain an oil-in-water (O / W) emulsion. The ratio of emulsified oil to water is 1:5-1:10.
[0039] 3. Emulsification solvent volatilization process: Same as ab...
Example Embodiment
[0040] Implementation example 3:
[0041] 1. Modification of magnetic ferroferric oxide: Same as above
[0042] 2. Preparation of oil-in-water emulsion
[0043] (1) Dissolve 1.0 g of polylactic acid-polyethylene glycol block copolymer (PLA-PEG-PLA) with a molecular weight of 30000 in 20 mL of dichloromethane and acetone (V acetone / V CH2Cl2 = 1:4) the mixed solution, add 0.15 g modified ferroferric oxide, and ultrasonically disperse to obtain the oil phase;
[0044] (2) 1.0g of polyvinyl alcohol is heated at 95°C and stirred at 500r / min for 1 hour and dissolved in 100mL of deionized water to obtain an aqueous phase;
[0045] (3) Slowly add the organic phase to the water phase with stirring at room temperature. When the temperature is 60℃, use a high-speed dispersing homogenizer 12000r / min to emulsify and disperse for 3-5min to obtain an oil-in-water (O / W) emulsion. The ratio of emulsified oil to water is 1:5-1:10.
[0046] 3. Emulsification solvent volatilization process: Same as abov...
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