Method for producing implants from calcium carbonate-containing composite powders with microstructured particles
A composite powder, microstructured technology for implant applications that can solve problems such as part surface quality and surface finish part density that is not completely satisfactory
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Embodiment 1
[0338] will contain 20% CO 2 and 80%N 2 CO 2 The gas mixture is introduced into 4 l of a calcium hydroxide suspension having a concentration of 75 g / l CaO and an initial temperature of 10°C. The air flow is 300l / h. The reaction mixture was stirred at 350 rpm, and the heat of reaction was dissipated during the reaction. When the conductivity drops suddenly (a drop of more than 0.5mS / cm / min, a drop of more than 0.25mS / cm within 30 seconds), add 0.7% amino tri(methylene phosphine) based on CaO (theoretical reference value) acid) was added to the suspension. When the reaction mixture is quantitatively carbonated into spherical calcium carbonate particles, the conversion to form spherical calcium carbonate particles is completed, wherein the pH value of the reaction mixture is 7-9. Herein, the reaction was complete after about 2 hours, and the pH of the reaction mixture was 7 at the end of the reaction.
[0339] The resulting spherical calcium carbonate particles are isolated...
Embodiment 2
[0341] 500ml of VE (demineralized) water was provided in a 1000ml beaker. 125 g of spherical calcium carbonate particles according to Example 1 were added with stirring, and the resulting mixture was stirred for 5 minutes. Slowly add 37.5g of 10% sodium metaphosphate (NaPO 3 ) n solution, and the resulting mixture was stirred for 10 minutes. 75.0 g of 10% phosphoric acid was slowly added, and the resulting mixture was stirred for 20 hours. The precipitate was separated and allowed to dry overnight at 130° C. in a drying oven. The average particle diameter of the obtained spherical calcium carbonate particles was 12 μm.
[0342] SEM images of spherical calcium carbonate particles are shown in figure 2 . On the surface of the spherical calcium carbonate particles, a thin phosphate layer can be seen.
Embodiment 3
[0344] A composite powder of spherical calcium carbonate particles and polylactic acid (PLLA) was produced according to the method described in JP 62083029A using an NHS-1 apparatus. It was cooled with water at 12°C. Polylactic acid microparticles 1 were used as mother particles, and spherical calcium carbonate particles of Example 1 were used as child particles (fillers).
[0345] Mix 39.5g of polylactic acid microparticles with 26.3g of CaCO at 6.400rpm 3 The powder is mixed and filled. The rotor speed of the unit was set at 6.400 rpm (80 m / s) and the metered material was processed for 10 minutes. The highest temperature reached in the grinding chamber of NHS-1 was 35°C. A total of 7 repetitions were performed using the same amount of material and machine settings. A total of 449 g of composite powder was obtained. The composite powder obtained was manually dry sieved through a 250 μm sieve. The sieve residue (fraction larger than 250 μm) was 0.4%.
[0346] The SEM im...
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