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Preparation method of polylactic acid material toughened by modified epoxidized vegetable oil

A technology for epoxidizing vegetable oil and polylactic acid materials, applied in the field of new materials, can solve problems such as strength reduction, and achieve the effects of improved material toughness, high mechanical strength, and improved compatibility

Active Publication Date: 2022-03-25
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many practical applications of epoxidized vegetable oil to toughen PLA. Adding epoxidized vegetable oil to PLA can greatly improve the flexibility of PLA, and the elongation at break of the material will be significantly improved, but the strength will be greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take the acrylamide of 1 weight part and the epoxidized castor oil of 13 weight parts;

[0020] dissolving acrylamide in an acetone solvent to form an acrylamide solution, the mass ratio of acrylamide to acetone solvent being 1:1;

[0021] After the acrylamide solution and the epoxidized castor oil are evenly mixed, mechanically stir at 50°C for 4 hours to completely react the acrylamide and the epoxidized castor oil, and introduce unsaturated double bonds into the long chain of the epoxidized castor oil molecules;

[0022] The reaction material is extracted with ethanol, dried and desolvated and purified to obtain modified epoxidized castor oil.

Embodiment 2

[0024] Take by weighing 2 parts by weight of acrylamide and 13 parts by weight of epoxidized palm oil;

[0025] dissolving acrylamide in an acetone solvent to form an acrylamide solution, the mass ratio of acrylamide to acetone solvent being 1:1.2;

[0026] After mixing the acrylamide solution and epoxidized palm oil evenly, mechanically stir at 52°C for 3 hours and 45 minutes to completely react the acrylamide and epoxidized palm oil, and introduce unsaturated bis key;

[0027] The reaction material is extracted with ethanol, dried and desolvated and purified to obtain modified epoxidized palm oil.

Embodiment 3

[0029] Take by weighing 3 parts by weight of acrylamide and 13 parts by weight of epoxidized soybean oil;

[0030] dissolving acrylamide in an acetone solvent to form an acrylamide solution, the mass ratio of acrylamide to acetone solvent being 1:1.5;

[0031] After the acrylamide solution and the epoxidized soybean oil are uniformly mixed, mechanically stir at 55°C for 3.5 hours to completely react the acrylamide and the epoxidized soybean oil, and introduce unsaturated double bonds in the long chain of the epoxidized soybean oil molecules;

[0032] The reaction material is extracted with ethanol, dried and desolvated and purified to obtain modified epoxidized soybean oil.

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Abstract

The invention discloses a preparation method of a polylactic acid material toughened by modified epoxidized vegetable oil. Epoxidized vegetable oil directly modifies polylactic acid, and toughness and strength of the material cannot be considered at the same time. The method comprises the following steps: firstly, uniformly mixing an acrylamide solution with epoxidized vegetable oil, stirring until complete reaction, extracting reaction materials with ethanol, drying, removing a solvent, and purifying to obtain modified epoxidized vegetable oil; then adding polylactic acid, modified epoxidized vegetable oil and an initiator into a high-speed mixer, stirring and premixing; adding the mixture into a mixing mill for melt mixing to obtain a polylactic acid mixed material, and preparing a polylactic acid blending material product by utilizing the polylactic acid mixed material. According to the method disclosed by the invention, unsaturated double bonds are introduced into molecular chains of the epoxidized vegetable oil modified by acrylamide, so that the compatibility between the epoxidized vegetable oil and a polylactic acid matrix can be effectively improved. The polylactic acid blending material prepared by the method disclosed by the invention is better in mechanical property, the transparency of the polylactic acid is reserved, and the biodegradability is not influenced.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a preparation method of a modified epoxidized vegetable oil toughened polylactic acid material with high light transmittance. [0002] technical background [0003] Polylactic acid (PLA) is a biodegradable polyester material with the advantages of non-toxic, harmless, good biocompatibility, and renewable. Although polylactic acid has so many advantages mentioned above, its inherent shortcomings such as high brittleness, high cost, and opaque toughening materials also greatly limit its development and application in industries such as packaging materials and agricultural films. On the premise of not affecting the biodegradability of the material, adding flexible polymer materials such as PBSU and PBAT to PLA can greatly improve its toughness and processing performance, and extrusion blow molding can be used to prepare various packaging materials. film. However, most biodegrad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L91/00C08K9/04C08K9/06C08K3/34C08K3/36
CPCC08L67/04C08L2201/10C08L2201/06C08L91/00C08K9/04C08K9/06C08K3/34C08K3/36Y02W90/10
Inventor 宋艳江许李燕羊海棠
Owner HANGZHOU NORMAL UNIVERSITY
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