Highly breathable one-way moisture barrier film for fruits and vegetables and preparation method thereof

Abstract

The invention discloses a highly air-permeable one-way moisture barrier film for fruits and vegetables and a preparation method thereof. The one-way moisture barrier film is composed of a hydrogel film layer and a spinning film layer, and is prepared by the following method: preparing carboxymethyl chitosan Solution: Weigh genipin and dissolve it in pure water in advance, then add dropwise in the carboxymethyl chitosan solution, sonicate so that genipin is evenly dispersed in the solution, place 4-12h to complete crosslinking, Then add Ca(OH) 2 and antibacterial substances, fully dispersed to obtain a hydrogel solution; pour the hydrogel solution into a glass plate, put it in a vacuum oven for drying, and peel it off to obtain a hydrogel film; then use ethyl cellulose and Tween‑ 80% ethanol solution was used as the spinning solution, and electrospinning was carried out on the hydrogel film until the spinning film layer completely covered the hydrogel film layer to obtain a one-way moisture barrier film. The one-way moisture-resistant film prepared by the invention can change the gas permeability according to the respiration of fruits and vegetables, has good moisturizing and humidity-regulating, waterproof and air-permeable properties, and slow-release performance, and can effectively prolong the shelf life of fruits and vegetables.

Description

(1) Technical field [0001] The invention belongs to the field of packaging materials, and in particular relates to a highly breathable unidirectional moisture barrier film for fruits and vegetables and a preparation method thereof. [0002] (2) Technical background [0003] Fruits play an important role in people's daily dietary structure, but most of them are easily decayed and cause serious economic losses. In developed countries, the rot of fruits due to post-harvest diseases is generally less than 5%, while the average loss rate of post-harvest fruits in my country is as high as 30%. Therefore, the development of safe and effective anti-corrosion preservation technology to prolong or maintain fruit quality has become an important food. research topic. [0004] The plastic wrap on the market mostly uses ethylene masterbatch as raw material, which is divided into three categories: polyethylene (PE), polyvinyl chloride (PVC) and polyvinylidene chloride (PVDC), which cause en...

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Problems solved by technology

[0005] 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

[0006] 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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