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Preparation method of polylactic acid/polyadipate-butylene terephthalate blend

A technology of butylene terephthalate and polyadipic acid is applied in the field of preparation of polylactic acid/polyadipic acid-butylene terephthalate blend, which can solve the problem of poor ADR reaction compatibilization effect and other problems, to achieve excellent compatibilization and toughening effects, optimize microstructure, and increase free volume.

Active Publication Date: 2020-02-21
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during melt blending, due to factors such as high melt viscosity, ADR cannot be well dispersed in the PLA / PBAT melt system, resulting in a poor compatibilization effect of ADR on the PLA / PBAT blend system.

Method used

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  • Preparation method of polylactic acid/polyadipate-butylene terephthalate blend
  • Preparation method of polylactic acid/polyadipate-butylene terephthalate blend
  • Preparation method of polylactic acid/polyadipate-butylene terephthalate blend

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The PLA and PBAT blends were heated to 50°C in a vacuum drying oven and vacuumed to ensure sufficient drying of the materials during the experiment and to inhibit thermal degradation during the heating and blending process. A total of 63g of PLA and PBAT resins were added to the mixing chamber, which can not only ensure that the samples are fully mixed, but also ensure that enough supercritical fluid is injected, and the airtightness of the internal mixer is good. The internal mixing chamber of the conventional internal mixer is strengthened and sealed, and the single plunger pump is connected with the internal mixing chamber to form a supercritical carbon dioxide assisted blending internal mixing mixing device.

[0021] The preparation method of polylactic acid / polyadipate-butylene terephthalate (PLA / PBAT) blend, PLA and PBAT are blended according to mass fraction 70:30, add mass fraction on this basis 0, 0.3, 0.5, 1.0 parts of ADR compatibilizer, see Examples 1 to 4 i...

Embodiment 2

[0029] The PLA and PBAT blends were heated to 50°C in a vacuum drying oven and vacuumed to ensure sufficient drying of the materials during the experiment and to inhibit thermal degradation during the heating and blending process. According to the conclusion obtained from the preliminary test, adding 63g of PLA and PBAT resin to the mixing chamber can ensure that the samples are fully mixed, and enough supercritical fluid can be injected, and the airtightness of the internal mixer is good.

[0030] The mixer of the conventional internal mixer is strengthened and sealed, and the single plunger pump is connected with the internal mixing chamber to form a supercritical carbon dioxide assisted blending internal mixing device.

[0031] In order to ensure a better refinement effect of OMMT on PBAT, PBAT and OMMT were conventionally melt blended first, and the mass ratios of PBAT and OMMT were 30:0.3, 30:0.6 and 30:1.0, respectively. Then PBAT-OMMT, PLA and ADR are added to the mixin...

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Abstract

The invention relates to a preparation method of polylactic acid / polyadipic acid-polybutylece terephthalate blend, and belongs to the field of high molecular polymer blending modification. In the method, the injection of a supercritical carbon dioxide fluid can generate synergistic capacity increasing and toughening effects on the PLA / PBAT blend with a chain extender ADR or ADR and organic montmorillonite (OMMT) beside reducing the viscosity of a processed melt, so as to further refine a PBAT dispersion phase and enhance the adhesion of a PLA / PBAT interface layer. Finally, a set of PLA / PBAT modified blends with high toughness is obtained, and the maximum notched impact strength is 36.23 kJ / m2. Under the plasticization of the supercritical carbon dioxide fluid, the selective distribution ofOMMT nanoparticles in the PBAT and PLA interface layers and in-situ generated PLA-ADR-PBAT block macromolecules can stabilize the interface of PBAT dispersion phase; and the synergistic effect enables the dispersion phase to be better refined during the blending process, thereby improving the impact toughness of the blend.

Description

technical field [0001] The invention relates to a preparation method of a polylactic acid / polyadipate-butylene terephthalate blend, belonging to the field of polymer blending modification. Background technique [0002] Polylactic acid (PLA) is a thermoplastic polyester synthesized from lactic acid obtained from starch fermentation, which has good biocompatibility and excellent properties of complete degradability. However, polylactic acid is a brittle material, which leads to its poor toughness and low elongation at break, and it is very easy to break and crack in daily life. Therefore, elastic materials or flexible materials should be used for blending modification. [0003] Polybutylene adipate-terephthalate (PBAT), like polylactic acid, is a fully degradable polyester material. Macroscopically, PBAT exhibits the characteristics of an elastomer. Therefore, melt blending of PBAT and PLA can improve the impact toughness of PLA. However, since PLA and PBAT are incompatibl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/02C08J3/00
CPCC08J3/005C08J2367/04C08J2467/02C08L67/04C08L67/02Y02P20/54
Inventor 徐鼐陈烜庞素娟潘莉莎
Owner HAINAN UNIVERSITY
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