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

A composite film and intelligent moisture control technology, which is applied in transportation and packaging, flexible coverings, coatings, etc. dew festering effect

Inactive Publication Date: 2019-10-08
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
CN104029449B 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 2kg polypropylene is stretched into a polypropylene porous film on a film unidirectional stretching machine.

[0055] Add 7g of polyvinyl alcohol A into 100mL of distilled water to fully dissolve. Add 2.1g of sodium sulfate, 0.2g of nano-zinc oxide, 0.35g of glutaraldehyde and 0.1g of sulfuric acid into the obtained solution, stir well until the mixture is uniform, and obtain a coating solution. Brush this coating solution evenly on one side of the polypropylene porous film, then place it in an oven, and dry it at 70°C for 10 minutes to obtain the intelligent moisture-controlling barrier composite film A1. The thickness of the base layer is 70 microns, and the pore diameter is 0.25 microns, the porosity is 50%, and the pores whose pore diameter is within the range of plus or minus one order of magnitude of the average pore diameter account for more than 85% of all pores; the thickness of the additional layer is 9 microns.

Embodiment 2

[0061] 2kg polypropylene is stretched into a polypropylene porous film on a film unidirectional stretching machine.

[0062] Add 7g of polyvinyl alcohol A into 100mL of distilled water to fully dissolve. Add 1.4g of lithium fluoride, 0.2g of nano-zinc oxide, 0.4g of formaldehyde and 0.1g of sulfuric acid into the obtained solution, stir well until the mixture is uniform, and obtain a coating solution. Brush this coating solution evenly on one side of the polypropylene porous film, then put it in an oven, and dry it at 60°C for 12 minutes to obtain the intelligent moisture control barrier composite film A2, the thickness of the base layer is 70 microns, and the pore diameter is 0.25 microns, the porosity is 50%, and the pores whose pore diameter is within the range of plus or minus one order of magnitude of the average pore diameter account for more than 85% of all pores; the thickness of the additional layer is 9 microns.

Embodiment 3

[0064] 2kg of polyethylene is stretched into a polyethylene porous film on a film unidirectional stretching machine.

[0065] Add 6g of polyvinyl alcohol A into 100mL of distilled water, stir well until completely dissolved. Then add 0.8g of calcium chloride and 0.2g of nano-silver, stir well until the mixture is uniform, and obtain a coating liquid. Brush this coating solution evenly on both sides of the polyethylene porous film, then place it in an oven, and dry it at 80°C for 8 minutes to obtain the dried film. The aqueous solution was evenly brushed on both sides of the dried film, and dried at 80°C for 8 minutes to obtain an intelligent moisture-controlling barrier composite film A3. The pores within the range of plus or minus one order of magnitude of the average pore diameter account for more than 75% of all pores; the thickness of the additional layer is 9 microns.

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Abstract

The invention belongs to the field of functional films, and relates to an intelligent moisture control composite barrier film, and a preparation method and application thereof. The intelligent moisture control composite barrier film comprises a base layer, and an additional layer or additional layers located on one side or both sides of the base layer. The base layer is a porous film comprising atleast one of polyethylene, polypropylene, polystyrene, polyterephthalic acid diol ester and polycaprolactam. The additional layer / layers is / are a dense film or dense films comprising polyvinyl alcohol, a metal salt, and an optional crosslinking agent and / or an optional antibacterial agent. The intelligent moisture control composite barrier film has an intelligent moisture control function, maintains the humidity of fruits and vegetables when the relative humidity is low, improves the moisture permeability when the relative humidity is high to prevent dewing and rotting of the fruits and vegetables, has oxygen barrier properties, and can be applied to fresh-keeping fruit and vegetable boxes and refrigerators with the fresh-keeping fruit and vegetable boxes.

Description

technical field [0001] The invention belongs to the field of functional films, and more specifically relates 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 an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C09D129/04C09D7/61C09D7/63C08L23/12C08L23/06C08L25/06C08L67/02B65D65/38
CPCB65D65/38C08J9/365C08J2323/06C08J2323/12C08J2325/06C08J2367/02C08J2429/04C08K2003/0806C08K2003/162C08K2003/2296C08K2003/309C08K2201/011C09D129/04C09D7/61C09D7/63C08K13/02C08K3/16C08K3/22C08K5/07C08K3/30C08K3/08
Inventor 张杨唐毓婧郑萃宋建会姚雪容任毅张韬毅
Owner CHINA PETROLEUM & CHEM CORP
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