High-transparency and high-ductility biaxially oriented poly-L-lactic acid film as well as raw material composition and preparation method thereof

• Main Authors: HUANG TIANHUAN, HUANG YU, LU JIANGRONG, ZHANG JIAN, ZHANG ZHELING, LI XIAOJING
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention provides a high-transparency and high-ductility biaxially oriented poly-L-lactic acid film as well as a raw material composition and a preparation method thereof. The raw material composition of the film comprises: 80-100 wt% of poly-L-lactic acid (PLLA); 0-20 wt% of a toughening agent; the chain extender accounts for 5wt% or less of the mass sum of the PLLA and the toughening agent, the plasticizer accounts for 10wt% or less of the mass sum of the PLLA and the toughening agent, and the nucleating agent accounts for 5wt% or less of the mass sum of the The invention also provides a preparation method of the PLLA film, which comprises the following steps: uniformly mixing the raw material composition, and carrying out casting extrusion to obtain a PLLA casting sheet; and carrying out two-way stretching on the casting sheet to obtain the PLLA film. The invention also provides the PLLA film prepared by the method. The high-transparency and high-ductility biaxially oriented PLLA film can solve the pr