Process for preparing poly-lacti acid
A polylactic acid and said technology, applied in the field of polylactic acid preparation, can solve the problems of high cost of polylactic acid, high production cost, large equipment investment, etc., and achieve excellent biocompatibility, reduced production cost, and save manpower and material resources. Effect
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Embodiment 1
[0024] 130
[0025] The main engine speed of the extruder is 120r / min, the first-level vacuum degree set in the third temperature section is 0.02-0.06MPa, the second-level vacuum degree set in the fourth temperature section is 0.005-0.01Mpa, and the fourth temperature at the end of the extruder Inject H at a rate of 0.002g / hour 2 The molecular weight is adjusted, and the reaction time is 15-30 minutes. 35.7Kg of polylactic acid product was obtained with a yield of 97.6%. The molecular weight detected by GPC gel chromatography was 120,000-150,000.
Embodiment 2
[0027] 140
[0028] The main engine speed of the extruder is 150r / min, and the primary vacuum degree set in the third and fourth temperature sections is 0.02-0.06MPa, and the secondary vacuum degree is 0.005-0.01Mpa. Inject H at the fourth temperature section at the end of the extruder in an amount of 0.008g / hour 2 Carrying out molecular weight regulation Carrying out molecular weight regulation, the reaction time is 20-30 minutes. The product polylactic acid 49Kg was obtained, and the yield was 98%. The molecular weight detected by GPC gel chromatography was 100,000-150,000.
Embodiment 3
[0030] 135
[0031] The main engine speed of the extruder is 180r / min, the first-level vacuum degree set in the third temperature section is 0.02-0.06MPa, and the second-level vacuum degree set in the fourth temperature section is 0.005-0.01Mpa. Inject H at the fourth temperature section at the end of the extruder at an amount of 0.006g / hour 2 The molecular weight is adjusted, and the reaction time is 10-25 minutes. Obtained polylactic acid product 44.2Kg, yield 98.2%. The molecular weight detected by GPC gel chromatography was 120,000-180,000.
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