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Gas-barrier and moisture-permeable film as well as preparation method and application thereof

A moisture-permeable film and gas-barrier technology, applied in the field of gas-barrier and moisture-permeable film and its preparation, can solve the problems of high cost, inability to change moisture permeability with humidity, lack of gas-barrier performance, etc., so as to prevent condensation and ulceration. Effect

Active Publication Date: 2021-11-12
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
[0005] 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
[0006] 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
[0007] CN103107301A discloses a kind of inorganic coating lithium-ion battery diaphragm, comprises multi-layer structure, is porous flexible base film and the coating that is coated on both sides of base film respectively, and coating comprises polyvinyl alcohol and zeolite particle, and 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
[0008] 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
[0010] 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
[0011] 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

[0073] 2kg polypropylene is stretched into a polypropylene porous film on a film unidirectional stretching machine.

[0074] The upper surface of the support layer was contacted with an aqueous solution containing 0.25% by weight of polyethyleneimine and 0.25% by weight of piperazine, and drained after contacting at 25°C for 60s; then, the upper surface of the support layer was again contacted with 1, The Isopar E solution of 3,5-benzenetricarboxylic acid chloride was drained after contacting at 25°C for 60s; then, the film was put into an oven and heated at 70°C for 3 minutes to obtain a composite film; After contacting the phytic acid aqueous solution with a mass concentration of 5% for 5 minutes, the solution was drained, and dried at 90° C. for 10 minutes to obtain the intelligent moisture control barrier composite film A1. The supporting layer has a thickness of 20 microns, a pore diameter of 0.25 microns, a porosity of 50%, and pores whose pore diameters are within an or...

Embodiment 2

[0076] 2kg polypropylene is stretched into a polypropylene porous film on a film unidirectional stretching machine.

[0077] Contact the upper surface of the support layer with an aqueous solution containing 2.0% by weight of polyethyleneimine and 0.2% by weight of m-phenylenediamine, and discharge the liquid after contacting for 60 seconds at 25°C; then, contact the upper surface of the support layer with an aqueous solution containing 0.15% by weight of The Isopar E solution of 1,3-phthaloyl chloride was drained after contacting at 25°C for 60s; then, the film was put into an oven and heated at 70°C for 3min to obtain a composite film; After contacting with phytic acid aqueous solution with a mass concentration of 0.5% for 5 minutes, drain the liquid, and dry at 90° C. for 10 minutes to obtain the intelligent moisture control barrier composite film A2. The support layer has a thickness of 20 microns, a pore diameter of 0.25 microns, a porosity of 50%, and pores whose pore di...

Embodiment 3

[0079] 2kg of polyethylene is stretched into a polyethylene porous film on a film unidirectional stretching machine.

[0080] The upper surface of the support layer was contacted with an aqueous solution containing 1.0% by weight of polyethyleneimine and 0.1% by weight of piperazine, and drained after contacting at 25°C for 60 seconds; then, the upper surface of the support layer was again contacted with 1,000% by weight of 1, The Isopar E solution of 4-phthaloyl chloride was drained after contacting at 25°C for 60s; then, the film was put into an oven and heated at 70°C for 3min to obtain a composite film; After contacting the phytic acid aqueous solution with a concentration of 1% for 5 minutes, the solution was drained, and dried at 90° C. for 10 minutes to obtain the intelligent moisture control barrier composite film A3. The thickness of the supporting layer is 20 microns, the pore diameter is 0.25 microns, the porosity is 50%, and the pores whose pore diameters are in th...

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Abstract

The invention provides a gas-barrier and moisture-permeable film as well as a preparation method and application thereof. The gas-barrier and moisture-permeable film comprises a supporting layer and an additional layer which are attached to each other, wherein the supporting layer is a porous film; and the additional layer is a polyamide layer, and phytic acid is chelated on the surface of the polyamide layer. The polyamide layer is formed by interfacial polymerization of polyamine and polyacyl chloride, and phytic acid on the surface of the polyamide layer is fixed on the surface of the membrane through chelation between amino and phosphate on the surface of polyamide. The introduction of phytic acid can generate chelation with amino groups of the polyamide layer to form a compact network structure, so that the gas barrier property of the membrane is improved; and on the other hand, the phytic acid has very strong hygroscopicity, so that the moisture permeability of the film is improved. The gas-barrier and moisture-permeable film disclosed by the invention has intelligent humidity control capability 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 a gas-barrier and moisture-permeable 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. In fruits and vege...

Claims

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Application Information

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IPC IPC(8): C08J7/048C08J7/04C08J5/18C08J9/36C09D177/06C08L23/12C08L23/06B65D65/42
CPCC08J7/048C08J7/04C08J7/0427C08J5/18C08J9/365B65D65/42C08J2323/12C08J2477/06C08J2323/06Y02E60/10
Inventor 张杨宋建会郑萃唐毓婧姚雪容潘国元刘轶群
Owner CHINA PETROLEUM & CHEM CORP
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