Beta-hydroxybutyrate and beta-hydroxyvalerate copolymer powder for selective laser sintering and preparation method thereof
A technology of hydroxybutyrate and hydroxyvalerate, which is applied in the field of β-hydroxybutyrate and β-hydroxyvalerate copolymer powder and its preparation, can solve the problems such as the absence of PHBV solid powder, and achieve the size of Moderate, uniform particle size distribution, suitable bulk density
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Embodiment 1
[0038] 100 parts by weight of PHBV resin and 1000 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.2MPa. Then the temperature was raised to 135° C. and kept at this temperature for 60 minutes.
[0039] After the constant temperature is over, the cooling water is lowered to 80°C at a rate of 1.0°C / min, and kept at this temperature for 60 minutes; continue to drop to room temperature at a rate of 1.0°C / min.
[0040] The material is centrifuged to separate the precipitate, and the precipitate is vacuum-dried to obtain a PHBV resin powder suitable for selective laser sintering.
[0041] The morphology of the obtained PHBV resin powder is as follows figure 1 The particle sizes and particle size distributions are listed in Table 1.
Embodiment 2
[0043] 100 parts by weight of PHBV resin and 800 parts by weight of acetone were placed in an autoclave. Introduce high-purity nitrogen to 0.1MPa. Then the temperature was raised to 140° C. and kept at this temperature for 80 minutes.
[0044] After the constant temperature is over, the cooling water is lowered to 70°C at a rate of 1.0°C / min, and kept at this temperature for 70 minutes; it is lowered to 20°C at a rate of 0.5°C / min, and maintained at 20°C for 30 minutes.
[0045] The material is centrifuged to separate the precipitate, and the precipitate is vacuum-dried to obtain a PHBV resin powder suitable for selective laser sintering.
[0046] Scanning electron microscopy was used to characterize the morphology of the obtained PHBV resin powder (results were similar to Example 1, and the SEM image was not shown here), and the particle size and particle size distribution are listed in Table 1.
Embodiment 3
[0048] 100 parts by weight of PHBV resin and 1200 parts by weight of butanone were placed in an autoclave. Introduce high-purity nitrogen to 0.3MPa. Then the temperature was raised to 130° C. and kept at this temperature for 90 minutes.
[0049] After the constant temperature is over, it is lowered to room temperature at a rate of 0.1°C / min.
[0050] The material is centrifuged to separate the precipitate, and the precipitate is vacuum-dried to obtain a PHBV resin powder suitable for selective laser sintering.
[0051] Scanning electron microscopy was used to characterize the morphology of the obtained PHBV resin powder (results were similar to Example 1, and the SEM image was not shown here), and the particle size and particle size distribution are listed in Table 1.
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