A method for preparing polystyrene-polyvinyl alcohol double-layer hollow microspheres
A technology of polystyrene and hollow microspheres, which is applied in the preparation of microspheres and microcapsule preparations, and can solve the difficulties of preparing large-diameter PS-PVA double-layer spheres, poor surface roughness of microspheres, and poor uniformity of coating thickness, etc. problem, to achieve the effect of solving the uncontrollable thickness of polyvinyl alcohol coating, avoiding direct collision, and wide application range
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Embodiment 1
[0039] This embodiment includes the following steps:
[0040] 1. Select a double-T milk particle generator with channel I, channel II and channel III having an inner diameter of 1.0mm, where channel I intersects channel II at 90°, and channel II intersects channel III at 90°;
[0041] 2. Prepare a HCl aqueous solution with pH=2, select PS hollow microspheres I with an inner diameter of 800 μm, an inner diameter deviation of ±20 μm, and water inside, soak them in an HCl aqueous solution with a pH of 2, and pass ozone into the HCl aqueous solution. The stirring speed is 80 rpm, the time is 2h, and the PS hollow microsphere II is obtained;
[0042] 3. Wash PS hollow microspheres II with distilled water three times, then soak PS hollow microspheres II in 2.5 wt% PVA solution for 24 hours at 25°C;
[0043] 4. Prepare HNO with a concentration of 10wt% 3 solution, the HNO 3 The solution is filled in the rotary evaporator, after soaking for 24h, pour out the HNO 3 solution, washed...
Embodiment 2
[0054] The steps of embodiment 2 and embodiment 1 are basically the same, the main difference is that the double T milk particle generator with the inner diameter of channel I, channel II and channel III is 1.2mm; Water-containing PS hollow microspheres Ⅰ; the ozone treatment process of PS hollow microspheres Ⅰ is the same as in Example 1, wherein the stirring speed is 60rpm to obtain PS hollow microspheres Ⅱ; PS hollow microspheres Ⅱ are soaked in 3.5 wt% PVA solution, The soaking time is 24 hours, the temperature is 25 °C; the hydrophobic treatment steps of the rotary steamer are the same as in Example 1; draw 3ml of 3.5 wt% PVA solution with a 5ml syringe, fix the syringe on a micro-injection pump, and pass a 1.2mm diameter glass capillary through a rubber hose and Connect with a 5ml syringe, draw PS hollow microspheres II into the glass capillary in turn, and connect with channel I through a polytetrafluoroethylene (PTFE) nut; draw 5ml 3.5 wt% PVA solution with a 5ml syring...
Embodiment 3
[0057] The steps of embodiment 3 are basically the same as those of embodiment 1, the main difference is that the double T milk particle generator with inner diameters of channel I, channel II and channel III are all 1.5mm; Water-containing PS hollow microspheres Ⅰ; the ozone treatment process of PS hollow microspheres Ⅰ is the same as in Example 1, wherein the stirring speed is 50rpm to obtain PS hollow microspheres Ⅱ; PS hollow microspheres Ⅱ are soaked in 4.5 wt% PVA solution, The soaking time is 24 hours, the temperature is 25°C; the hydrophobic treatment steps of the rotary steamer are the same as in Example 1; draw 3ml of 4.5 wt% PVA solution with a 5ml syringe, fix the syringe on a micro-injection pump, and pass a glass capillary with a diameter of 1.5mm through the rubber hose and Connect with a 5ml syringe, draw PS hollow microspheres II into the glass capillary in turn, and connect to the channel I through a polytetrafluoroethylene (PTFE) nut; draw 5ml of 4.5 wt% PVA ...
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