Method for preparing polymer elastic microsphere through precipitation polymerization
An elastic microsphere, precipitation polymerization technology, applied in the field of preparing polymer elastic microspheres, can solve the problems of high density, long polymerization time, polyurea microspheres are not elastic, etc., and achieve fast and yield, simple method and single raw material Effect
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Embodiment 1
[0043] At room temperature, 90.0 g of acetone, 1.97 g of ethylene glycol, 2.23 g of poly(propyl ether triol) with a number average molecular weight of 2000, and 5.80 g of toluene diisocyanate were respectively added into a 120 mL glass reaction bottle. After the reaction bottle was shaken until the monomer was completely dissolved, the reaction bottle was sealed and placed in a constant temperature water bath, and reacted at 70°C for 90 minutes. The product was added to a centrifuge tube, and centrifuged at a speed of 10,000 rpm for 5 min with a high-speed centrifuge. The lower solid was washed twice with acetone and dried at 80° C. for 120 min to obtain monodisperse polyurethane elastic microspheres.
[0044] The yield of the obtained microspheres was 85.40%. Scanning electron micrographs of the obtained microspheres are shown in figure 1 As shown, the average particle size of the microspheres thus measured is 6.85 μm, and the particle size polydispersity coefficient is 1.0...
Embodiment 2
[0046] At room temperature, add 80.0 g of acetonitrile, 1.27 g of trimethylolpropane, 14.27 g of polyethylene adipate diol with a number average molecular weight of 4000, and 4.46 g of diphenylmethane into a 120 mL glass reaction bottle diisocyanate. After the reaction bottle was shaken until the monomer was completely dissolved, the reaction bottle was sealed and placed in a constant temperature water bath shaker at 50° C., and reacted for 120 min at a vibration frequency of 150 osc / min. The product was added to a centrifuge tube, and centrifuged at a speed of 6000 rpm for 8 min with a high-speed centrifuge. The lower solid was washed twice with acetonitrile and dried at 120° C. for 60 min to obtain monodisperse polyurethane elastic microspheres.
[0047] The yield of the obtained microspheres was 92.54%. The average particle size of the obtained microspheres was 10.45 μm, and the particle size polydispersity coefficient was 1.010. The rebound rate of the microsphere is 10...
Embodiment 3
[0049] At room temperature, 70.0 g of N,N-dimethylformamide, 3.60 g of glycerin, 14.67 g of polytetrahydrofuran diol with a number average molecular weight of 1000, and 11.73 g of p-phenylene diisocyanate were respectively added into a 120 mL glass reaction bottle. After the reaction bottle was shaken until the monomer was completely dissolved, the reaction bottle was sealed and placed in a constant temperature water bath shaker at 75° C., and reacted for 80 minutes at a vibration frequency of 200 osc / min. The product was added to a centrifuge tube, and centrifuged at a speed of 12,000 rpm for 3 min with a high-speed centrifuge. The solid in the lower layer was washed twice with N,N-dimethylformamide and dried at 120° C. for 60 min to obtain monodisperse polyurethane elastic microspheres.
[0050] The yield of the obtained microspheres was 95.74%. The average particle size of the obtained microspheres was 14.55 μm, and the particle size polydispersity coefficient was 1.018. ...
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