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Intelligent humidity control film and preparation method and application thereof

A thin film and intelligent technology, applied in the field of intelligent moisture control thin film and preparation, can solve the problems of high cost, complicated process, high price, etc., and achieve the effects of low cost, simple preparation method and improved moisture permeability.

Active Publication Date: 2021-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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
CN104029449A discloses a coating film with a large moisture permeability, the base layer is an expanded polytetrafluoroethylene film layer, and the coating is a polyurethane emulsion copolymer coating containing hemp stalk core ultrafine powder. Applicable to car lamp housings, but does not have intelligent humidity control performance
CN103507339A discloses a moisture-sensing and moisture-permeable film, which keeps regenerated cellulose in the base material of non-woven fabric, but does not have gas barrier properties
CN103107301A discloses a kind of inorganic coating lithium-ion battery diaphragm, comprises multi-layer structure, is respectively porous flexible base film and the coating that is coated on both sides of base film, coating comprises polyvinyl alcohol and zeolite particle, the auxiliary of this coating The composition does not contain metal salts, and the composite film does not have the function of intelligent moisture control
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

Method used

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  • Intelligent humidity control film and preparation method and application thereof
  • Intelligent humidity control film and preparation method and application thereof
  • Intelligent humidity control film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Get 2kg polypropylene and stretch it into a porous film on a film unidirectional stretching machine. Then take 5g of polyvinyl alcohol and add it into 100mL of distilled water to fully dissolve it, then add 0.1g of nano-zinc oxide, 0.5g of glutaraldehyde and 0.01g of sulfuric acid into the above mixture, and stir until it is evenly mixed. Brush evenly the mixed solution with a pH value of 2.5 on the polypropylene porous film, then place it in an oven, dry it at 70°C for 10 minutes, and then soak the obtained dried film in 5% mass concentration of Sodium 2-formaldehyde benzene sulfonate aqueous solution (pH value is 2.5), take it out after 5 minutes, put it in an oven, and dry it at 70°C for 10 minutes to obtain the intelligent humidity control film A1, the thickness of the support layer is 35 microns, and the pore size is 0.1 The thickness of the functional layer is 2 microns, and the gel content of the functional layer is 85%; the thickness of the hydrophilic modificat...

Embodiment 2

[0051] Get 2kg of polyethylene and stretch it into a porous film on a film unidirectional stretching machine. Take 7g of hydroxymethyl cellulose and add it into 100mL of distilled water to fully dissolve it, then add 0.2g of nano-zinc oxide, 0.4g of formaldehyde and 0.1g of sulfuric acid into the above mixed solution, and stir until it is evenly mixed. Brush evenly the mixed solution with a pH value of 2 on the polypropylene porous film, then place it in an oven, and dry it at 70°C for 10 minutes, and then soak the obtained dried film in 7.5% mass concentration of benzaldehyde-2,4-sodium disulfonate aqueous solution (pH value is 2.0), take it out after 3 minutes, put it in an oven, and dry it at 70°C for 10 minutes to obtain the intelligent humidity control film A2, the thickness of the support layer is 30 microns, The pore diameter is 0.08 micron, the porosity is 40%; the thickness of the functional layer is 2.3 micron, and the gel content of the functional layer is 74%; the ...

Embodiment 3

[0053] Get 2kg polypropylene and stretch it into a porous film on a film unidirectional stretching machine. Add 9g of hydroxyethyl cellulose into 100mL of distilled water, fully dissolve, then add 0.2g of nano-zinc oxide, 1.0g of glutaraldehyde and 0.1g of sulfuric acid into the obtained solution, and fully stir until mixed evenly. Brush evenly the mixed solution with a pH value of 2 on the polypropylene porous film, then place it in an oven, dry it at 70°C for 10 minutes, and then immerse the obtained dried film in 10% mass concentration of 3,4-diformaldehyde sodium benzene sulfonate aqueous solution (pH value is 1.5), take it out after 3 minutes, put it in an oven, and dry it at 70°C for 10 minutes to obtain the intelligent humidity control film A3, the thickness of the support layer is 35 microns, The pore diameter is 0.1 micron, the porosity is 45%; the thickness of the functional layer is 3.5 micron, and the gel content of the functional layer is 83%; the thickness of the...

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Abstract

The invention discloses an intelligent humidity control film as well as a preparation method and application thereof. The intelligent humidity control film comprises a supporting layer and a functional layer hydrophilic modification layer, and the functional layer is located on one side of the supporting layer. The supporting layer is a porous film. The functional layer comprises an aliphatic polymer containing polyhydroxy, and an optional antibacterial agent. The surface of the functional layer is a hydrophilic surface modification layer formed by reacting a sulfonate monomer containing aldehyde groups with an aliphatic polymer containing polyhydroxy. The intelligent humidity control film provided by the invention can preserve moisture under the condition of low humidity, has strong moisture removal capability under the condition of high humidity, and has air blocking performance. The intelligent humidity control film is simple in preparation method, low in cost and especially suitable for fresh-keeping packaging of vegetables and fruits.

Description

technical field [0001] The invention relates to the field of functional films, in particular to an intelligent moisture-controlling film, 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. In fruits and vegetabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/10B01D67/00B65D65/38
CPCB01D69/02B01D69/10B01D67/0002B65D65/38
Inventor 张杨郑萃唐毓婧宋建会姚雪容潘国元刘轶群
Owner CHINA PETROLEUM & CHEM CORP
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