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Polylactic acid packaging film with controlled-release antioxidant activity and preparation method thereof

An antioxidant activity, polylactic acid technology, applied in packaging, wrapping paper, biological packaging, etc., can solve problems such as shortening, loading natural antioxidants, and instability of natural antioxidants, and achieve the effect of increasing toughness

Inactive Publication Date: 2020-03-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the instability of natural antioxidants is easily affected by factors such as temperature, light, or pH. Only by simply mixing natural antioxidants with the polylactic acid matrix will shorten or even lose the antioxidant capacity of the polylactic acid composite film. aging
[0004] Although there have been a lot of researches at home and abroad on the preparation of polylactic acid antioxidant active packaging materials by adding natural antioxidant active substances, they have not used multi-walled carbon nanotubes to load natural antioxidants, and then added them to polylactic acid substrates to prepare controlled-release food antioxidants. Research on Oxidation Active Packaging Materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The preparation method of this controlled-release anti-oxidant active polylactic acid packaging film is as follows:

[0021] (1) Mix 9500g of polylactic acid (with a weight average molecular weight of 100,000) and 500g of polytrimethylene carbonate (with a weight average molecular weight of 200,000) evenly, and dry them in a vacuum oven at 25°C for 10 hours to obtain a matrix resin;

[0022] (2) 1600g of multi-walled carbon nanotubes and 400g of tea polyphenols were mixed to obtain a blend;

[0023] (3) Add the blend of step (2) into 16000 mL of dichloromethane, ultrasonically disperse for 20 minutes, stir at room temperature for 12 hours to fully volatilize the dichloromethane solvent, and obtain multi-walled carbon nanotube particles loaded with tea polyphenols;

[0024] (4) Take 8 kg of matrix resin in step (1) and 2 kg of multi-walled carbon nanotube particles loaded with tea polyphenols in step (3), add them to a twin-screw extruder for blending, and ...

Embodiment 2

[0026] Embodiment 2: The preparation method of this controlled-release anti-oxidant active polylactic acid packaging film is as follows:

[0027] (1) After mixing 8000g of polylactic acid (with a weight average molecular weight of 100,000) and 2000g of polytrimethylene carbonate (with a weight average molecular weight of 100,000) evenly, dry it in a vacuum oven at 25°C for 10 hours to obtain a matrix resin;

[0028] (2) Mix 980g of multi-walled carbon nanotubes and 20g of grape seed extract to prepare a blend;

[0029] (3) Add the blend of step (2) into 4000mL of dichloromethane, ultrasonically disperse for 25min, stir at room temperature for 12h to fully volatilize the dichloromethane solvent, and obtain multi-walled carbon nanotube particles loaded with grape seed extract;

[0030] (4) Take 9.8 kg of matrix resin in step (1) and 0.2 kg of multi-walled carbon nanotube particles loaded with grape seed extract in step (3), add them to a twin-screw extruder for blending, and mel...

Embodiment 3

[0032] Embodiment 3: The preparation method of this controlled-release type antioxidant active polylactic acid packaging film is as follows:

[0033] (1) After mixing 9000g of polylactic acid (weight average molecular weight of 300,000) and 1000g of polytrimethylene carbonate (weight average molecular weight of 250,000) evenly, dry in a vacuum oven at 25°C for 10 hours to obtain a matrix resin;

[0034] (2) Mix 1700g of multi-walled carbon nanotubes and 300g of clove extract to prepare a blend;

[0035] (3) Add the blend of step (2) into 10000mL of dichloromethane, ultrasonically disperse for 15min, stir at room temperature for 12h to fully volatilize the dichloromethane solvent, and obtain multi-walled carbon nanotube particles loaded with clove extract;

[0036] (4) Take 8.5 kg of matrix resin in step (1) and 1.5 kg of multi-walled carbon nanotube particles loaded with clove extract in step (3), add them to a twin-screw extruder, blend, and melt (the temperature in the fourt...

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PUM

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Abstract

The invention discloses a polylactic acid packaging film with controlled-release antioxidant activity. The polylactic acid packaging film comprises the following components in percentage by mass: 80-98% of matrix resin and 2-20% of natural antioxidant-loaded multi-walled carbon nanotube particles. The polylactic acid packaging film is prepared by loading a natural antioxidant onto a multi-walled carbon nanotube, then mixing the natural antioxidant-loaded multi-walled carbon nanotube with the matrix resin, and carrying out extrusion by adopting a melt extrusion method, wherein the matrix resinis a blend of polylactic acid and poly trimethylene carbonate. According to the invention, raw materials used in a preparation method can be biodegraded, and production process is simple; the multi-walled carbon nanotube is used for loading the natural antioxidant, and slow release of the natural antioxidant can be effectively controlled, so the timeliness of the antioxidant effect of the packaging film is improved; and the packaging film can be applied to the field of active antioxidant packaging of food.

Description

technical field [0001] The invention relates to a controlled-release anti-oxidation active polylactic acid packaging film and a preparation method thereof, belonging to the technical field of food active packaging. Background technique [0002] Chemosynthetic plastics have become the material of choice worldwide in food packaging applications due to their performance, cost-effectiveness and durability. However, the use of a large number of chemically synthesized plastics has led to serious global pollution problems. Therefore, research in the last decade has focused on finding solutions that can replace traditional plastics with biodegradable materials, among which polylactic acid, which is fermented from renewable resources, Due to its superior properties such as biodegradability, processability, and mechanical strength, it has been widely used in many applications such as food packaging in recent years. [0003] Consumer preferences for safer, healthier, and more convenie...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L69/00C08K9/12C08K3/04C08K5/00C08J5/18B65D65/38
CPCC08J5/18B65D65/38C08J2367/04C08J2469/00C08K9/12C08K3/041C08K5/005Y02W90/10Y02A40/90
Inventor 覃宇悦蒋凯简禄印董雪兰方可崔芮陆王惟
Owner KUNMING UNIV OF SCI & TECH
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