A kind of degradable plastic wrap and its preparation method and application

A technology of fresh-keeping film and polylactic acid-based film, which is applied in the field of degradable fresh-keeping film and its preparation, and can solve the problems of lack of moisture resistance, poor fresh-keeping effect, difficult to degrade and recycle, etc.

Active Publication Date: 2022-04-01
NANJING UNIV OF FINANCE & ECONOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Petroleum-based plastic packaging materials have the advantages of low cost, good mechanical properties, strong barrier properties, and good heat-sealing properties, but they are difficult to degrade and recycle, and will pollute the environment
Although natural polymer packaging materials (such as proteins, carbohydrates, and lipids) are biodegradable, they have poor moisture resistance and poor fresh-keeping effect
Therefore, there is a lack of degradable packaging materials with high moisture resistance in the prior art to package and keep edible fungi fresh.

Method used

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  • A kind of degradable plastic wrap and its preparation method and application
  • A kind of degradable plastic wrap and its preparation method and application
  • A kind of degradable plastic wrap and its preparation method and application

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preparation example Construction

[0054] The present invention also provides a preparation method of the degradable plastic wrap described in the above technical solution, comprising the following steps:

[0055] Chitosan-caffeic acid graft copolymer and polyethylene glycol blend are dissolved in chloroform to obtain a blend solution;

[0056] Polylactic acid is dissolved in chloroform to obtain a polylactic acid solution;

[0057] adding the blended solution to the polylactic acid solution to obtain a coating solution;

[0058] The coating liquid is formed into a film to obtain the degradable fresh-keeping film.

[0059] In the invention, the chitosan-caffeic acid graft copolymer and the polyethylene glycol blend are dissolved in chloroform to obtain a blend solution. In the present invention, the preparation method of the blend of described chitosan-caffeic acid graft copolymer and polyethylene glycol, preferably comprises the following steps:

[0060] Chitosan-caffeic acid graft copolymer, polyethylene g...

Embodiment 1

[0084] With 0.50g chitosan (2.61mmol) and 1.06g1-hydroxybenzotriazole (7.83mmol) dissolving (600r / min stirring 20h under rotating speed) in 50mL volume concentration is 2% acetic acid aqueous solution, obtains chitosan solution;

[0085] Dissolve 0.61712g caffeic acid (7.83mmol) (37kHz ultrasound 20min) in 2mL absolute ethanol to obtain caffeic acid ethanol solution; Amine hydrochloride was dissolved (37kHz ultrasound 20min) in 2mL absolute ethanol to obtain 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride ethanol solution; the caffeic acid ethanol solution And 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride ethanol solution is added dropwise in the chitosan solution according to the dropping rate of 60 drops / min, in dark (with tin foil Paper wrapped reactor) under the conditions of coupling reaction 24h; the coupling reaction product 10000r / min centrifugal 15min, get the supernatant; add 2mL of 11mol / L hydrochloric acid solution to mix and then dialyze...

Embodiment 2

[0093] Prepare chitosan-caffeic acid graft copolymer according to the method of embodiment 1;

[0094] 0.2g chitosan-caffeic acid graft copolymer was dissolved (37kHz ultrasonic 30min) in 20mL ultrapure water to obtain a copolymer solution; 0.5g molecular weight was 8000 polyethylene glycol dissolved (600r / min magnetic stirring 30min) In 25mL of ultrapure water, polyethylene glycol solution was obtained; the copolymer solution and polyethylene glycol solution were magnetically stirred at 25°C for 1 hour to obtain an aqueous solution of chitosan-caffeic acid graft copolymer and polyethylene glycol;

[0095] The aqueous solution of chitosan-caffeic acid graft copolymer and polyethylene glycol was magnetically stirred at 90°C for water evaporation until the solution was viscous and then dried at 60°C for 12 hours; the dried product was soaked in liquid nitrogen for 10 minutes and placed in Grinding in a mixed ball mill; pass the ground product through a 150-mesh sieve, and take t...

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Abstract

The invention belongs to the technical field of composite materials, and in particular relates to a degradable plastic wrap and its preparation method and application. The invention provides a degradable plastic wrap, which comprises a polylactic acid base film, polyethylene glycol and chitosan-caffeic acid graft copolymer contained in the polylactic acid base film. In the present invention, the chitosan-caffeic acid graft copolymer can destroy the dense structure of polylactic acid, thereby improving the air permeability of the degradable plastic wrap, and then improving the moisture resistance of the degradable plastic wrap, and inhibiting the growth of edible fungi in the degradable fresh-keeping film. The quality deterioration under the packaging of the film prolongs the shelf life of the edible fungi. In the present invention, the polylactic acid as a base material has good biocompatibility and degradability, and the present invention uses polylactic acid as a base material to make the degradable fresh-keeping film degradable.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a degradable plastic wrap and its preparation method and application. Background technique [0002] Edible fungus is a large edible fungus with fleshy or gelatinous fruiting bodies. It is delicious and nutritious, rich in various amino acids, vitamins, minerals, etc. However, due to the high water content of freshly harvested edible fungi, they are still undergoing strong metabolism and respiration after harvesting, which can easily cause enzymatic browning, water-soaked tissues, and even rotten deterioration during storage and transportation. Change phenomenon, eventually lose edible quality and commodity value. Therefore, it is a key problem to be solved urgently in the edible fungus industry to find an effective fresh-keeping method and to suppress the quality deterioration of the edible fungi after harvesting. [0003] Packaging preservation is a com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L71/02C08L51/02C08J5/18B65D65/46
CPCC08J5/18B65D65/466C08J2367/04C08J2471/02C08J2451/02Y02W90/10Y02A40/90
Inventor 裴斐韩萍胡秋辉杨文建方东路马宁姜建新杨华平
Owner NANJING UNIV OF FINANCE & ECONOMICS
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