Glass fiber reinforced polylactic acid resin powder for selective laser sintering, and preparation thereof
A technology of polylactic acid resin and laser sintering, which is applied in processing and manufacturing, additive processing, solid material additive processing, etc., can solve the problems of poor physical and mechanical properties and limitations, and achieve small dimensional errors, fewer holes, and simple operation steps Effect
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Embodiment 1
[0038] 100 parts by weight of 1510 brand polylactic acid resin (96% optical purity) and 1000 parts by weight of acetone were placed in a high-pressure reactor. Introduce high-purity nitrogen to 0.2MPa; then raise the temperature to 135°C, and keep the temperature at this temperature for 60 minutes; after the end of constant temperature, cool down to 100°C with cooling water at a rate of 1.0°C / min, and keep the temperature at this temperature for 60 minutes; continue Decrease to 25°C at a rate of 1.0°C / min, and keep at this temperature for 60 minutes. After adding 10 weight fractions of ultra-short glass fibers with a diameter of 5 μm and a length of 150 μm, 0.25 weight fractions of antioxidant 1330, and 0.5 weight fractions of calcium stearate to the obtained solid-liquid mixture, centrifuged and vacuum dried to obtain Glass fiber reinforced polylactic acid resin powder suitable for selective laser sintering. The particle size of the glass fiber reinforced polylactic acid res...
Embodiment 2
[0040] 100 parts by weight of 4032D grade polylactic acid resin (98% optical purity) and 800 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.1MPa; then raise the temperature to 140°C, and keep the temperature at this temperature for 30 minutes; after the end of constant temperature, cool down to 20°C with cooling water at a rate of 1.0°C / min, and keep at 20°C for 60 minutes. After adding 25 weight fractions of ultra-short glass fibers with a diameter of 10 μm and a length of 250 μm, 0.5 weight fraction of antioxidant 1330, and 1 weight fraction of zinc stearate to the obtained solid-liquid mixture, centrifuged and vacuum dried to obtain Glass fiber reinforced polylactic acid resin powder suitable for selective laser sintering. The particle size of the glass fiber reinforced polylactic acid resin powder is 30-100 μm, and the particle size distribution is D10=44 μm, D50=58 μm, D90=88 μm.
Embodiment 3
[0042] 100 parts by weight of 2002D polylactic acid resin (96% optical purity) and 1200 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.3MPa; then raise the temperature to 130°C, and keep the temperature at this temperature for 90 minutes; after the constant temperature is completed, cool down to 25°C with cooling water at a rate of 0.1°C / min, and keep the temperature at this temperature for 90 minutes. After adding 10 weight fractions of ultra-short glass fibers with a diameter of 15 μm and a length of 200 μm, 0.25 weight fractions of antioxidant 1330, and 0.75 weight fractions of nano-silica to the obtained solid-liquid mixture, centrifuged and vacuum dried to obtain Glass fiber reinforced polylactic acid resin powder suitable for selective laser sintering. The particle size of the glass fiber reinforced polylactic acid resin powder is 20-120 μm, and the particle size distribution is D10=30 μm, D50=67 μm, D90=105 μm.
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