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Polylactic acid composition with ductility and impact toughness and preparation method thereof

A technology of impact toughness and polylactic acid, which is applied in the field of polylactic acid composition with both ductility and impact toughness and its preparation, can solve the problem of material strength decline, elongation at break, low impact strength, and inability to toughen or plasticize and other problems, to achieve the effect of increasing impact toughness and ductility, improving interfacial cohesion, and simple methods

Active Publication Date: 2018-04-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, polylactic acid materials are brittle, lack ductility and impact toughness, low elongation at break and low impact strength, so their applications are limited.
Generally, blending polylactic acid with plasticizer can improve the ductility of the material, but it is often difficult to effectively improve its impact toughness at the same time, and lead to a significant decrease in the strength of the material
In addition, these plasticizers will gradually migrate out of the PLA matrix over time, causing the material to harden and become brittle again.
Chinese patent CN103194052A prepares polyethers such as polyethylene glycol-dibasic acid copolymer, polyethylene glycol-dibasic acid-lactide terpolymer or polyethylene glycol-dibasic acid-lactic acid terpolymer Polyester and polylactic acid are melt blended to toughen modified polylactic acid, which effectively overcomes the migration behavior of polyethylene glycol by increasing the molecular weight, and the presence of polylactic acid segments in the terpolymer increases In order to improve the compatibility with the polylactic acid matrix, the polylactic acid material has a higher elongation at break, but the patent does not mention the impact toughness of the modified polylactic acid
However, the PLBSI used contains itaconic acid repeating units with double bonds. The presence of double bonds leads to an appropriate amount of crosslinking during the blending process, which may be beneficial to the improvement of mechanical properties, but may also be detrimental to its biodegradability influences
Moreover, copolymers containing polylactic acid segments cannot guarantee good modification effects
For example, European Polymer Journal (49:914-922, 2013) reported P(CL-co-LA) copolyester blending modified polylactic acid, using the compatibility of polylactic acid segment and polylactic acid matrix in copolyester Thereby improving the impact strength of PLA material, but the elongation at break is only 21%
In Industrial&Engineering ChemistryResearch, the multi-block copolymer of PLA and PBS is blended with high molecular weight PLLA. Although the elongation at break can be raised to 320%, the highest impact strength is only 2.8kJ / m 2
The polylactic acid segment in this type of multi-block copolymer lacks flexibility and cannot play the role of toughening or plasticizing like the polyester segment, so the modification effect is not good

Method used

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  • Polylactic acid composition with ductility and impact toughness and preparation method thereof
  • Polylactic acid composition with ductility and impact toughness and preparation method thereof
  • Polylactic acid composition with ductility and impact toughness and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Synthesis of hydroxyl-terminated flexible polyester prepolymer PPA:

[0050] Add 1,2-propanediol and adipic acid, the molar ratio of 1,2-propanediol and adipic acid is 1.2:1, stir the above reaction system at 160°C until the solution becomes clear, then add the catalyst n-butyl titanate, Add n-butyl titanate in an amount of 0.1% of the molar amount of adipic acid, raise the temperature to 170°C, carry out the esterification reaction under a nitrogen atmosphere, raise the temperature by 10°C every 1 to 3 hours, and control the maximum esterification temperature to 190°C , until the end of the esterification reaction when there is no distillate.

[0051] The reaction system was evacuated, and the temperature was raised to 200° C. for polycondensation reaction. After 10 hours of reaction, a hydroxyl-terminated flexible polyester prepolymer PPA was obtained.

[0052] After testing, the hydroxyl-terminated flexible polyester prepolymer PPA has a number-average molecular wei...

Embodiment 2

[0055] Synthesis of hydroxyl-terminated flexible polyester prepolymer PBAT:

[0056]Add butanediol, terephthalic acid and adipic acid, wherein the molar ratio of terephthalic acid and adipic acid is 45:55, and the alkyd molar ratio in the reaction system is 2:1, and stir the above reaction system at 170°C After 30 minutes, add the catalyst n-butyl titanate, the amount of n-butyl titanate added is 0.1% of the molar amount of dibasic acid, raise the temperature to 180°C, carry out the esterification reaction under nitrogen atmosphere, and raise the temperature by 10°C every 1-3h ℃, and control the maximum esterification temperature to be 200 ℃ until the reaction solution is completely clear and transparent to end the esterification reaction.

[0057] The reaction system was evacuated, and the temperature was raised to 210° C. for polycondensation reaction. After 12 hours of reaction, a hydroxyl-terminated flexible polyester prepolymer PBAT was obtained.

[0058] After testing, ...

Embodiment 3

[0060] Synthesis of hydroxyl-terminated flexible polyester prepolymer PBSA:

[0061] Add butanediol, succinic acid and adipic acid, wherein the molar ratio of succinic acid to adipic acid is 40:60, and the molar ratio of alkyd to acid in the reaction system is 1.2:1, and the above reaction system is stirred at 170°C until complete After clarification and transparency, add the catalyst n-butyl titanate, the amount of n-butyl titanate added is 0.1% of the molar amount of the dibasic acid, and the temperature is raised to 180°C, and the esterification reaction is carried out under a nitrogen atmosphere, and the temperature is raised every 1 to 3 hours 10°C, and control the maximum esterification temperature to 200°C until the reaction solution is completely clear and transparent to end the esterification reaction.

[0062] The reaction system was evacuated, and the temperature was raised to 210° C. for polycondensation reaction. After 12 hours of reaction, a hydroxyl-terminated f...

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Abstract

The invention provides a polylactic acid composition having ductility and impact toughness and a preparation method thereof. The polylactic acid composition is prepared by melt-blending, by weight, polylactic acid 60-90% and polyethylene glycol-flexible polyester segmented copolymer10-40%, or polylactic acid 10-90%, flexible polyester 10-90% and polyethylene glycol-flexible polyester segmented copolymer1-10% of the total mass of the polylactic acid and flexible polyester. The polyethylene glycol-flexible polyester segmented copolymer can improve the elongation at break of the polylactic acid to reach 100-330%, meanwhile has the impact strength of 10-44 kJ / m<2>, can remarkably improve the brittleness of the polylactic acid, accordingly the wider usage requirements are met, andthe application field of the polylactic acid is widened.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polylactic acid composition with both ductility and impact toughness and a preparation method thereof. Background technique [0002] Plastics have become an indispensable material in people's lives. Traditional plastics are mainly petroleum-based plastics such as polyethylene, polypropylene, and polystyrene. These plastics are difficult to degrade in the environment after being used and discarded, resulting in increasing global white pollution. On the other hand, with the increasing consumption of petrochemical resources, it is difficult for the traditional plastic industry to develop sustainably. In the natural environment, biodegradable plastics will eventually decompose into water and carbon dioxide, which are non-toxic to the environment, and return to the ecological environment. They are environmentally friendly green materials that replace traditional plastics a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/02C08L75/06C08L75/08C08G18/48C08G18/42
CPCC08G18/4018C08G18/4216C08G18/4238C08G18/4833C08L67/02C08L67/04C08L2201/06C08L2205/02C08L2205/03C08L75/06C08L75/08
Inventor 吴林波李若云
Owner ZHEJIANG UNIV
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