Solid phase devolatilization method of polylactic acid with medium and high optical purity

The invention belongs to the field of bio-based biodegradable materials, and particularly relates to a solid-phase devolatilization method of polylactic acid with medium and high optical purity. Extruding a polylactic acid melt with medium and high optical purity: extruding the polylactic acid melt...

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Bibliographische Detailangaben
Hauptverfasser:	CHENG HUI, WANG GUODONG, WU XIANGJUN, WANG FAHUI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING MAKING GRANULES OR PREFORMS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The invention belongs to the field of bio-based biodegradable materials, and particularly relates to a solid-phase devolatilization method of polylactic acid with medium and high optical purity. Extruding a polylactic acid melt with medium and high optical purity: extruding the polylactic acid melt with medium and high optical purity into strips; cooling and crystallizing: cooling the strip-shaped polylactic acid melt with dry gas, and crystallizing at a constant temperature to obtain crystallized polylactic acid; cooling the crystallized polylactic acid with dry gas, and granulating to obtain crystallized polylactic acid particles; and performing solid-phase devolatilization on the crystallized polylactic acid particles, and then cooling with dry gas to obtain a polylactic acid product. According to the process of firstly crystallizing and then pelletizing, the temperature is gradually reduced from the melt melting temperature (155-185 DEG C) to the crystallization temperature (100-120 DEG C) and then to the