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Reinforcing and toughening polylactic acid material and preparation method thereof

A polylactic acid material, reinforcement and toughening technology, applied in the field of reinforced and toughened polylactic acid material and its preparation, 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 Effects of fluidity, compatibility improvement, and toughness improvement

Active Publication Date: 2017-08-11
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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  • Reinforcing and toughening polylactic acid material and preparation method thereof
  • Reinforcing and toughening polylactic acid material and preparation method thereof
  • Reinforcing and toughening polylactic acid material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Weigh 8g 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.

[0049] (2) Add 3 g of LDHs-g-PCL and an organic solvent into a three-necked flask equipped with a mechanical stirrer, blow in nitrogen, raise the temperature of the oil bath to 70°C, and after the raw materials are completely dissolved, add 2.2126 g of hydrogenated Add diphenylmethane diisocyanate to the reaction system, add catalyst, react in nitrogen atmosphere for 2h, then adjust the temperature to 75°C, add 0.8g 1,4-butanediol, continue to react for 1.5h, and the reaction product is cooled to room temperature to obtain secondary functionalized LDHs-g-PU.

[005...

Embodiment 2

[0053] (1) Weigh 8g of LDHs and 45g of ε-CL into a three-neck flask, ultrasonicate for 40min, heat up to 100°C, add catalyst stannous octoate, 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 30h to get LDHs-g-PCL.

[0054] (2) Add 3 g of LDHs-g-PCL and an organic solvent into a three-necked flask equipped with a mechanical stirrer, feed nitrogen, raise the temperature of the oil bath to 60°C, and press LDHs-g-PCL after the raw materials are completely dissolved. The molar ratio of PCL to diisocyanate is 1:2.3. Add diphenylmethane diisocyanate to the reaction system, add catalyst, react in nitrogen atmosphere for 1h, then adjust the temperature to 70°C, according to the molar ratio of diisocyanate to chain extender After adding ethylene glycol at a ratio of 0.14:1, the reaction ...

Embodiment 3

[0058] (1) Weigh 8g of LDHs and 19g of ε-CL into a three-neck flask, ultrasonicate for 50min, heat up to 120°C, add catalyst dibutyltin, 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 get LDHs-g-PCL.

[0059] (2) Add 3g of LDHs-g-PCL and organic solvent into a three-necked flask equipped with a mechanical stirrer, feed nitrogen gas, raise the temperature of the oil bath to 70°C, and press LDHs-g-PCL after the raw materials are completely dissolved. The molar ratio of PCL to diisocyanate is 1:5. Add 1,6-hexamethylene diisocyanate and toluene diisocyanate to the reaction system, add catalyst, react in nitrogen atmosphere for 2 hours, then adjust the temperature to 80°C, The molar ratio of the chain agent was 0.75:1. After adding 1,2-propanediol, the reaction was continued...

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Abstract

The invention provides a reinforcing and toughening polylactic acid material and a preparation method thereof, and relates to the field of polymer materials. The preparation method comprises the steps of mixing layered double hydroxides with epsilon-caprolactone and obtaining reactants, and after a ring opening polymerization, obtaining polycaprolactone modifier; conducting addition polymerization on the polycaprolactone modifier and diisocyanate, and obtaining prepolymer; making the prepolymer react with chain extender, and obtaining polyurethane modifier; melting and mixing the polyurethane modifier and polylactic acid, and obtaining the reinforcing and toughening polylactic acid material. Flexible chain segments of the polyurethane modifier improve the elasticity and flexibility of the material, rigid chain segments of the polyurethane modifier improve the strength and heat resistance of the material, and finally the overall mechanical property of the material is improved. Since the layered double hydroxides with a laminated structure are dispersed in a base material, the bending strength and stretching strength of the material are improved, and the anchoring effect of the material can avoid the modifier compatibility and migration problem which is easily generated from simple physical blending.

Description

technical field [0001] The invention relates to the field of polymer materials, and in particular to a reinforced and toughened 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 plants such as corn, wheat, and cassava 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 Purity 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 dio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L75/06C08K9/10C08K3/22C08K7/00C08G63/08C08G18/66C08G18/42C08G18/32
CPCC08G18/664C08G18/6651C08G18/6655C08G63/08C08K2201/011C08L67/04C08L75/06C08K9/10C08K7/00C08K3/22
Inventor 朱和平姚进毛龙肖晓柯胜海冯正洋郑思洁刘静怡
Owner HUNAN UNIV OF TECH
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