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

A composite film, intelligent moisture control technology, used in transportation and packaging, containers to prevent rot, polyether coatings, etc.

Active Publication Date: 2021-03-23
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
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 barrier composite film and preparation method and application thereof
  • Intelligent humidity-control barrier composite film and preparation method and application thereof
  • Intelligent humidity-control barrier composite film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 2kg polypropylene is stretched into a polypropylene porous film on a film unidirectional stretching machine.

[0052] Add 5g of polyethersulfone (with an ion exchange capacity of 2.0mmol / g) and 0.5g of polyethylene glycol (with a molecular weight of 10,000) containing carboxylate and sulfonate sodium salt groups with a formula I structure to 94.3g N , N-dimethylformamide, fully dissolved. Add 0.2g of nanometer zinc oxide 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 90°C for 5 minutes to obtain the intelligent moisture-control barrier composite film A1. The thickness of the base layer is 70 microns, and the pore diameter is 0.25 micron, porosity is 50%, and the pores whose pore diameter is in the range of plus or minus one order of magnitude of the average pore diameter account for more than 85% of...

Embodiment 2

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

[0055] Add 7.5g polyethersulfone (its ion exchange capacity is 1.7mmol / g) and 0.2g polyethylene glycol (molecular weight: 100000) containing carboxylate and sulfonate sodium salt groups with II formula structure to 91.8g N, N- dimethylacetamide, fully dissolved. Add 0.5g of nanometer zinc oxide 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 50°C for 20 minutes to obtain an intelligent moisture-controlling 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 ...

Embodiment 3

[0057] 2kg of polyethylene is stretched into a polyethylene porous film on a film unidirectional stretching machine.

[0058] Add 2.5g polyethersulfone (its ion exchange capacity is 1.8mmol / g) and 0.1g polyethylene glycol (molecular weight is 50000) containing carboxylate and sulfonate sodium salt groups with III formula structure to 97.3g N, N-dimethylacetamide, fully dissolved. Add 0.1 g of nanometer zinc oxide 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 A2. The thickness of the base layer is 70 microns, and the pore diameter is 0.25 micron, the porosity is 50%, and the pores whose pore diameter is within an order of magnitude of the average pore diameter account for more than 85% of all pores; the thickness of t...

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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 additional layer(s), the base layer is of a one-layer or two-layer structure, and the additional layer(s) are arranged on one side of the base layer or arranged on the two sides of the base layer at the same time. The base layer is a porous film and is made of at least one of polyethylene, polypropylene, polystyrene, polybutylene terephthalate and polycaprolactam. The additional layer(s) contain(s) polyethylene glycol, polyetherketone and / or polyethersulfone containing carboxylate and sulfonate groups, and an antibacterial agent. The intelligent humidity-control barrier compositefilm has the intelligent humidity control capacity, keeps the humidity of fruits and vegetables when the relative humidity is low, increases the moisture permeability when the relative humidity is high so as to prevent the fruits and vegetables from condensation and collapse, has the oxygen barrier property, and can be used for fruit and vegetable boxes with a fresh-keeping function and refrigerators with fresh-keeping fruit and vegetable boxes.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C09D181/06C09D171/02C09D171/10C09D7/61B65D65/40B65D81/24C08L23/12C08L23/06C08L25/06C08L67/02C08L77/02
CPCC08J9/365C09D181/06C09D7/61B65D65/40B65D81/24C08K2201/011C08K2003/2296C08K2201/003C08J2323/12C08J2323/06C08J2325/06C08J2367/02C08J2377/02C08L71/02C08K3/22
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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