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Toughened modified polylactic acid material and preparation method thereof

A polylactic acid material, toughening modification technology, applied in the field of polymer materials, can solve the problems that limit the wide application of PLA materials, slow crystallization rate, and decrease in material toughness, so as to improve dimensional stability and processing fluidity, and improve phase Capacitance, the effect of improving toughness

Active Publication Date: 2017-07-25
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, polylactic acid also has some obvious disadvantages: (1) due to the polarity of the main chain ester group and the steric hindrance of the side methyl group, the polylactic acid has a large segment rigidity and poor impact resistance; (2) polylactic acid exists The problems of slow crystallization rate and many crystal defects further deteriorate its mechanical properties, which limit the wide application of PLA materials in the field of general plastics.
However, the modifier has low molecular weight and poor thermal stability. It will slowly migrate to the surface of the material during use, and it is easy to phase-separate with PLA, resulting in a decrease in the toughness of the material, and cannot achieve a long-term plasticizing effect.

Method used

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  • Toughened modified polylactic acid material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh 6g of LDHs and 35g of ε-CL into a three-neck flask, ultrasonicate for 30min, heat up to 110°C, add catalyst stannous octoate, N 2 React under protection for 24 hours. After the reaction is over, dissolve the viscous polymer in dichloromethane, filter and wash to remove impurities, precipitate in glacial hexane, wash to remove unreacted monomers, and vacuum at 40°C. Dry for 24h to get LDHs-g-PCL.

[0039] (2) Add 2g of LDHs-g-PCL and 8g of polylactic acid into a three-necked flask equipped with a mechanical stirrer, feed nitrogen, raise the temperature of the oil bath to 195°C, and after the raw materials are completely melted, add 0.02g The hydrogenated diphenylmethane diisocyanate was added to the reaction system, reacted for 1 h in a nitrogen atmosphere, and finally removed the oil bath, and the reaction product was cooled to room temperature to crystallize to obtain a white product modified polylactic acid material.

[0040] (3) The modified polylactic aci...

Embodiment 2

[0042] (1) Weigh 6g of LDHs and 54g of ε-CL into a three-neck flask, ultrasonicate for 40min, heat up to 100°C, add catalyst stannous chloride, N 2 React under protection for 20 hours. After the reaction is over, dissolve the viscous polymer in dichloromethane, filter and wash to remove impurities, precipitate in glacial hexane, wash to remove unreacted monomers, and vacuum at 35°C. Dry for 20h to obtain LDHs-g-PCL.

[0043] (2) Add 2g of LDHs-g-PCL and 10g of polylactic acid into a three-necked flask equipped with a mechanical stirrer, feed nitrogen, raise the temperature of the oil bath to 165°C, and after the raw materials are completely melted, add 0.01g Hydrogenated diphenylmethane diisocyanate and 0.012g hydrogenated toluene diisocyanate were added to the reaction system, reacted in a nitrogen atmosphere for 2 hours, and finally removed the oil bath, and the reaction product was cooled to room temperature to crystallize to obtain a white product modified polylactic acid ...

Embodiment 3

[0046] (1) Weigh 6g of LDHs and 34g of ε-CL into a three-neck flask, ultrasonicate for 35min, heat up to 140°C, add catalyst stannous oxide, N 2 React under protection for 30 hours. After the reaction is over, dissolve the viscous polymer in dichloromethane, filter and wash to remove impurities, precipitate in glacial hexane, wash to remove unreacted monomers, and vacuum at 45°C. Dry for 20h to obtain LDHs-g-PCL.

[0047] (2) Add 3g of LDHs-g-PCL and 7g of polylactic acid into a three-necked flask equipped with a mechanical stirrer, blow in nitrogen, raise the temperature of the oil bath to 180°C, and after the raw materials are completely melted, press polylactic acid Add toluene diisocyanate to the reaction system at a molar ratio of 1:1, react in a nitrogen atmosphere for 1.5 hours, and finally remove the oil bath, and wait for the reaction product to cool to room temperature and crystallize to obtain a white product modified polylactic acid material.

[0048] (3) The modi...

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Abstract

The invention provides a toughened modified polylactic acid material and a preparation method thereof and relates to the field of polymer materials. The preparation method comprises mixing a layered double hydroxide and epsilon-caprolactone to obtain a reactant, carrying out a ring-opening polymerization reaction process to obtain a modified layered double hydroxide, melting the modified layered double hydroxide and polylactic acid, and preparing the toughened modified polylactic acid material through an isocyanate as a chain extender. The toughened modified polylactic acid material has good impact resistance and toughness, improves overall mechanical properties, and prevents low molecular weight plasticization (or toughening) modifier migration easily caused by simple physical blending. Through use of the strong polar -NHCOO- group, polylactic acid toughness, aging resistance and wear resistance are further improved. The toughened modified polylactic acid material can be used as a degradable material for individual use and can also be used as a modified polylactic acid master batch for mixing with pure polylactic acid.

Description

technical field [0001] The invention relates to the field of polymer materials, and in particular to a toughened modified polylactic acid material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) material, as a fully biodegradable aliphatic polyester, has excellent biocompatibility and stiffness. This linear thermoplastic biodegradable aliphatic polyester uses starch extracted from corn, wheat, cassava and other plants as the initial raw material, and is decomposed by enzymes to obtain glucose, which is then fermented by lactic acid bacteria into lactic acid, and then chemically synthesized to obtain high Pure polylactic acid. PLA material has good mechanical strength, thermoplasticity, fibrillation and transparency, etc. It is suitable for various processing methods and is considered to be the most ideal substitute material for petroleum-based plastics. Polylactic acid prepared from lactic acid can be degraded into carbon dioxide and w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/10C08K3/22C08K5/29
CPCC08K3/22C08K5/29C08K9/10C08K2201/011C08L67/04
Inventor 姚进朱和平毛龙肖晓冯正洋郑思洁刘静怡
Owner HUNAN UNIV OF TECH
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