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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 applications, heating methods, household appliances, etc., can solve the problems of poor moisture permeability, lack of gas barrier performance, and composite film without intelligent moisture control.

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

[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

[0060] 2kg polypropylene is stretched into a polypropylene porous film on a film unidirectional stretching machine.

[0061] Add 6g of polyvinyl alcohol A and 2g of hydroxypropyl cellulose into 100mL of distilled water to fully dissolve. Then, 0.8g of lithium chloride, 0.2g of nano-zinc oxide, 0.4g of glutaraldehyde and 0.1g of sulfuric acid were added to the obtained solution, and fully stirred until the mixture was evenly mixed to 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 1...

Embodiment 2

[0067] 2kg polypropylene is stretched into a polypropylene porous film on a film unidirectional stretching machine.

[0068] Add 7g of polyvinyl alcohol A and 1g of sodium polystyrene sulfonate into 100mL of distilled water to fully dissolve. Then, 0.8g of lithium chloride, 0.2g of nano-zinc oxide, 0.4g of glutaraldehyde and 0.1g of sulfuric acid were added to the obtained solution, and fully stirred until the mixture was evenly mixed to 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 ...

Embodiment 3

[0070] 2kg of polyethylene is stretched into a polyethylene porous film on a film unidirectional stretching machine.

[0071] Add 6g of polyvinyl alcohol A and 0.32g of 2-acrylamide-2-methylpropanesulfonic acid copolymer into 100mL of distilled water, stir well until completely dissolved. Then add 1.5g of lithium bromide and 0.2g of nano-silver, stir well until the mixture is uniform, and obtain a coating solution. 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 is evenly brushed on both sides of the dried film, and dried at 80°C for 8 minutes to obtain the intelligent moisture control film A3. The pores in the range of plus or minus one order of magnitude accounted for more than 75% of the total pores; the thickness of the additional layer was 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, an auxiliary component, and at least one of an optional assisting agent, an optional crosslinking agent and an optional antibacterial agent. The auxiliary component is cellulose and cellulose derivatives and / or macromolecular sulfonate. The assisting agent is at least one of a water-soluble metal salt, an acid-soluble metal oxide and polyalcohol. The intelligent moisture control composite barrier film with an intelligent moisture control ability is applicable to total heat exchange elements of air heat exchangers for indoor air moisture control.

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] With the improvement of living standards, people pay more and more attention to the quality of indoor air. Fresh air circulation is an effective and economical way to improve indoor air. The quality of indoor air is improved through the exchange of indoor and outdoor air. In summer, the outdoor air is often hot and humid. The fresh air and exhaust air exchange heat and moisture in the total heat exchanger to keep the indoor air dry and cool; in winter, the outdoor air is often dry and cold, and the indoor air is humid and warm. After the appliance is close to the state of indoor air. At present, in China, the indoor and outdoor air is generally exchanged through an air heat exchanger, which can adjust the temperature and humidity of...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08L23/12C08L25/06C08L67/02C08L77/02F24F3/14
CPCC08J9/365C08J2323/12C08J2325/06C08J2367/02C08J2377/02C08J2401/28C08J2425/18C08J2429/04C08J2451/00F24F3/14F24F2003/1435
Inventor 宋建会唐毓婧张韬毅张杨郑萃姚雪容李森史颖任敏巧
Owner CHINA PETROLEUM & CHEM CORP
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