Intelligent humidity control barrier composite film, and preparation method and application thereof

Abstract

The invention relates to an intelligent humidity control barrier composite film, and a preparation method and application thereof. The intelligent humidity control barrier composite film comprises a base layer and an additional layer, and the additional layer is located on one side of the base layer; the base layer is a porous film and is made of at least one of polyethylene, polypropylene, polystyrene, polyethylene glycol terephthalate and polycaprolactam; and the additional layer comprises a cross-linked substance of a multi-hydroxyl polymer and an acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, and in addition, the additional layer also contains an optional antibacterial agent. The intelligent humidity control barrier composite film has the intelligent humidity control capability, keeps the humidity of fruits and vegetables when the relative humidity is relatively low, increases the moisture permeability when the relative humidity is relatively high so as to prevent the fruits and vegetables from dew formation and ulceration, has the oxygen barrier performance, and can be used for a fruit and vegetable box with a fresh-keeping function and a refrigerator with the fresh-keeping fruit and vegetable box.

Description

technical field [0001] The invention relates to the field of functional films, in particular to an intelligent moisture-controlling barrier composite film and its preparation method and application. Background technique [0002] Fruits and vegetables are important foods for human beings, and they are the main sources of basic nutrients (vitamins, minerals, complex carbohydrates, etc.). With the improvement of people's living standards, the requirements for the freshness of fresh fruits and vegetables are getting higher and higher. Fruits and vegetables can continue to carry out life activities such as respiration and transpiration after harvesting, and water loss and nutrient consumption will occur during storage. For every 10°C increase in temperature, the respiratory intensity of fruits and vegetables doubles. The way to keep fruits and vegetables fresh at home is to store fruits and vegetables in the refrigerator to slow down the respiration of fruits and vegetables. I...

AI Technical Summary

Problems solved by technology

The temperature-sensitive and moisture-permeable membrane is prone to condensation on the surface of the membrane under high humidity and low temperature; the silicon filter membrane has a moisturizing function, but the moisture permeability cannot be changed with humidity; The performance meets the requirements, but the preparation process is not environmentally friendly, the process is complicated, and there may be problems with excessive chlorine content in the processing process

[0004] CN105986511A discloses the technology of applying natural polymers with good hydrophilic water retention and film-forming properties on base paper with high dry and wet strength, but the cost is relatively high

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CN1864829A discloses a hydrophilic-hydrophobic bipolar composite membrane and its preparation method. The membrane has a double-layer structure, the bottom layer is a porous support layer, and the upper layer is a hydrophilic membrane containing lithium chloride. The membrane has high moisture permeability and It has a strong blocking effect on other gas molecules, but it does not have intelligent humidity control

WO2012133805A1 discloses a moisture-permeable membrane, the porous substrate is preferably polytetrafluoroethylene, which is expensive, and the high moisture-permeable performance of the membrane is not good

US20030054155A1 discloses a waterproof and moisture-permeable composite membrane, the hydrophobic layer is polytetrafluoroethylene, and the hydrophilic layer is polyurethane. The membrane has high moisture permeability, but does not have intelligent moisture control performance