Preparation method of full-degradable high-strength high-barrier polylactic acid film by in-situ introduction of poly butylene succinate nanosheet

A polybutylene succinate, in-situ introduction technology, applied in the field of high-barrier and high-strength polylactic acid films, can solve the problems of inferior mechanical properties and barrier properties, low toughness of polylactic acid, enlarged polylactic acid, etc., to achieve strength and poor barrier properties, good toughness, and easy implementation

Inactive Publication Date: 2016-07-06
谢兰 +2
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Problems solved by technology

[0006] The present invention aims at defects such as low toughness and poor barrier performance of polylactic acid, serious interface problems and poor mechanical properties and barrier properties caused by common blending methods, so as to regulate the structural form of PBS in polylactic acid matrix and prepare mechanical properties and A fully degradable composite film material with excellent barrier properties, aiming to expand the application of polylactic acid in the field of packaging materials

Method used

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  • Preparation method of full-degradable high-strength high-barrier polylactic acid film by in-situ introduction of poly butylene succinate nanosheet
  • Preparation method of full-degradable high-strength high-barrier polylactic acid film by in-situ introduction of poly butylene succinate nanosheet
  • Preparation method of full-degradable high-strength high-barrier polylactic acid film by in-situ introduction of poly butylene succinate nanosheet

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Embodiment 1-6

[0030] (1) Drying of raw materials: Dry polylactic acid (4032D, NatureWorks, USA) and PBS (Bionolle#1001MD, Showa, Japan) in a blast oven at a constant temperature of 80°C for 12 hours;

[0031] (2) Melt-blending extrusion: Gained dry polylactic acid and PBS are melt-blended in a twin-screw extruder according to different mass ratios, wherein the mass fraction of PBS is respectively 10wt%, 20wt%, 40wt%, 60wt%, 80wt% and 90wt%, using high feeding speed and screw speed to obtain PBS-containing nanoparticles, the extruded material is exposed to cold air and fully cooled and then cut into pellets. The specific formula is shown in Table 1, and the extrusion blending process parameters are shown in the table 2;

[0032] (3) Form PBS fibers in situ by "slit extrusion-heat stretching-quenching": fully dry the polylactic acid / PBS blended extrusion material so that the moisture weight content is less than 0.01%, and then dry the co-extruded material after drying. The mixture pellets ar...

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Abstract

The invention discloses a preparation method of a fully degradable high-strength and high-barrier polylactic acid film. The method is to firstly melt and blend polylactic acid and PBS under strong shear, so that the PBS droplets are violently broken into nanoparticles in the matrix. The strong tensile/shear field transforms PBS nanoparticles into nanofibers, and finally uses the "confined sheet" method to transform PBS nanofibers into regular and dense PBS nanosheets in a molding machine or a twin-roller continuous extrusion molding device, A polylactic acid high-strength and high-barrier film containing PBS nanosheets was obtained. The polylactic acid film products containing PBS nanosheets prepared by the present invention retain the good biodegradability of PBS and polylactic acid on the one hand, and on the other hand, a large number of oriented and straightened PBS nanosheets can block the infiltration of gas/water molecules and act as self-reinforcement The structural unit obtains simultaneous improvement of mechanical properties and barrier properties.

Description

technical field [0001] The invention relates to the technical field of processing fully degradable bioplastic film products, in particular to a process method for a high-barrier and high-strength polylactic acid film containing polybutylene succinate in-situ nanosheets. Background technique [0002] Polylactic acid is famous for its good biocompatibility and degradability in the existing bioplastics market, and its excellent mechanical strength and modulus have stabilized the leading position of polylactic acid in the bioplastics industry (Xie, L.; Xu, H. ; et al., J. Polym. Res. 2014, 21, 357-371.). However, poor toughness and gas barrier properties severely limit the application of polylactic acid in the field of food and drug packaging, which is the field where polylactic acid is most likely to replace traditional petroleum-based polymer products in large quantities (Xie, L.; Xu, H.; et al., Biomacromolecules 2014, 15, 4054-4064). Aiming at this development bottleneck, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08J5/18B29C69/02
Inventor 谢兰徐欢陈晶斌
Owner 谢兰
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