High-permeability one-way waterproof film of fruits and vegetables and preparation method thereof high-permeability one-way waterproof film

Abstract

The invention discloses a high-permeability one-way waterproof film of fruits and vegetables and a preparation method thereof the high-permeability one-way waterproof film. The one-way waterproof filmis composed of a hydrogel film layer and a spinning film layer. The one-way waterproof film is prepared by the following methods: preparing a carboxymethyl chitosan solution; firstly dissolving genipin into pure water in advance, further adding the genipin into the carboxymethyl chitosan solution drop by drop, performing ultrasonic treatment to uniformly disperse the genipin into the solution, allowing the solution to stand for 4-12 hours to complete cross-linking, further adding Ca(OH)2 and bacteriostatic substances, and fully dispersing the components so as to obtain a hydrogel solution; pouring the hydrogel solution into a glass plate, performing drying in a vacuum drying oven, and performing peeling so as to obtain a hydrogel film; and by taking an ethanol solution of ethyl celluloseand Tween-80 as a spinning solution, performing electrostatic spinning on the hydrogel film until the spinning film completely covers the hydrogel film, so as to obtain the one-way waterproof film. The one-way waterproof film prepared by the invention can change gas permeability according to respiration of fruits and vegetables, and has good properties of moisturizing, moisture adjustment, waterproofness, air permeability and sustained release, and is capable of effectively prolonging the shelf life of fruits and vegetables.

Description

[0001] (1) Technical field [0002] The invention belongs to the field of packaging materials, and in particular relates to a highly breathable one-way moisture-resistant film for fruits and vegetables and a preparation method thereof. [0003] (2) Technical background [0004] Fruits play an important role in people's daily dietary structure, but most fruits are easy to decay and cause serious economic losses. In developed countries, fruit rot caused by postharvest diseases is generally less than 5%, while the average loss rate of postharvest fruit in my country is as high as 30%. Therefore, it has become an important food to develop safe and effective antiseptic preservation technology to prolong or maintain fruit quality. research topic. [0005] Most of the plastic wraps on the market are made of vinyl masterbatch, which are divided into three categories: polyethylene (PE), polyvinyl chloride (PVC) and polyvinylidene chloride (PVDC), which may cause environmental pollution ...

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Problems solved by technology

[0006] Patent CN 108163369 B discloses a one-way moisture-proof multi-layer edible film and its preparation method. It consists of a hydrophobic outer layer, a middle transition layer and a hydrophilic inner layer. The one-way moisture-proof film is prepared by casting method. However, since the inner layer of this method is directly made of a hydrophilic material, it is easy to dissolve when it comes into contact with a large amount of water vapor, and the water storage performance is not good.

Patent CN 105986511A discloses a method for manufacturing fruit and vegetable moisture-regulating fresh-keeping film. The base paper uses plant fiber as a raw material, and is coated with a mixture of hydrophilic and water-retaining natural polymers and non-water-soluble safe, environmentally friendly, mildew-proof and antibacterial agents. Glue makes humidity-adjusting fresh-keeping film, and this invention fresh-keeping film itself does not have the ability of water storage, water replenishment, only has certain hygroscopicity, moisturizing performance, and must be preserved in the refrigerator fruit and vegetable box of certain humidity, practicality is poor

[0007] The traditional one-way moisture barrier film has poor water storage capacity, short release time, and insufficient air permeability of the film. Therefore, the production of a highly breathable film with humidity control function for fruit and vegetable preservation has broad application prospects

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