A kind of preparation method of crosslinked polyurethane microsphere and/or polyurethane hollow microsphere
A technology of cross-linking polyurethane and hollow microspheres, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problem of not reflecting the performance of polyurethane soft elastic
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Embodiment 1
[0051] 20 parts by weight -1055, 15 parts by weight 75 parts by weight The organic phase composed of 0.03 parts by weight of dibutyltin dilaurate was uniformly mixed at room temperature, and the molar ratio of isocyanate groups to hydroxyl groups was 7.6. Using a high-speed disperser at 2000rpm, 110 parts by weight of deionized water was slowly added to the above organic phase within 7 minutes, dispersed for 10 minutes, and then poured into a 500ml three-necked flask, adding 0.75 parts by weight of 90SH-400, at 150rpm Heat up to 50°C under stirring, react for 6 hours, then heat up to 90°C for 1 hour, cool to room temperature, and filter with a 100-mesh filter to obtain a white polyurethane microsphere suspension with a solid content of 49.7%, and use a centrifuge for solid-liquid separation , the filter cake was dried in a vacuum oven at 70° C. for 4 hours, and after grinding, cross-linked polyurethane microspheres with an average particle size of 21 μm and a Tg of 43° C. ...
Embodiment 2
[0053] 10 parts by weight DL-400, 23 parts by weight -1055, 40 parts by weight 15 parts by weight 35 parts by weight The organic phase composed of 0.04 parts by weight of dibutyltin dilaurate was uniformly mixed at room temperature, and the molar ratio of isocyanate groups to hydroxyl groups was 1.6. Using a high-speed disperser at 2000rpm, 123 parts by weight of deionized water was slowly added to the above organic phase within 14 minutes, dispersed for 30 minutes, and then poured into a 500ml three-necked flask, adding 0.75 parts by weight of 90SH-400, at 150rpm Heat up to 55°C under stirring, react for 5 hours, then heat up to 85°C for 2 hours, cool to room temperature, and filter with a 100-mesh filter to obtain a white polyurethane microsphere suspension with a solid content of 49.7%. After solid-liquid separation with a centrifuge, The filter cake was dried in a vacuum oven at 70°C for 4 hours, and after grinding, cross-linked polyurethane microspheres with an a...
Embodiment 3
[0055] 7 parts by weight 43 parts by weight -1055, 50 parts by weight 10 parts by weight The organic phase composed of 0.03 parts by weight of dibutyltin dilaurate was uniformly mixed at room temperature, and the molar ratio of isocyanate groups to hydroxyl groups was 2.8. Using a high-speed disperser at 2000rpm, 110 parts by weight of deionized water was slowly added to the above organic phase within 10 minutes, dispersed for 10 minutes, and then poured into a 500ml three-necked flask, adding 0.75 parts by weight of 90SH-400, at 150rpm Heat up to 55°C under stirring, react for 5 hours, then heat up to 85°C for 2 hours, cool to room temperature, and filter with a 100-mesh filter to obtain a white polyurethane microsphere suspension with a solid content of 49.5%. After solid-liquid separation with a centrifuge, The filter cake was dried in a vacuum oven at 70°C for 4 hours, and after grinding, polyurethane microspheres with an average particle size of 30 microns and a Tg...
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