CN109107399B - Water molecule permeable membrane and preparation method and application thereof - Google Patents
Water molecule permeable membrane and preparation method and application thereof Download PDFInfo
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- CN109107399B CN109107399B CN201810853333.7A CN201810853333A CN109107399B CN 109107399 B CN109107399 B CN 109107399B CN 201810853333 A CN201810853333 A CN 201810853333A CN 109107399 B CN109107399 B CN 109107399B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/02—Details relating to pores or porosity of the membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/38—Hydrophobic membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention discloses a water molecule permeable membrane and a preparation method and application thereof, wherein the preparation method comprises the following steps: adding a film forming substance of a polymer film and an antibacterial material into a solvent, uniformly mixing, filtering by a filter screen to obtain a coating solution, coating the coating solution on a hydrophobic porous base film by using an anilox roller, drying, and forming a hydrophilic polymer film on the hydrophobic porous base film to obtain the water molecule permeable film. The water molecule permeable membrane has high water molecule transmittance, can be used for an anhydrous fog and sterile water molecule humidifier, can quickly diffuse tap water into the environment through the water molecule permeable membrane in the form of water molecules by using a fan, and has the advantages of energy conservation and health.
Description
Technical Field
The invention relates to the technical field of water molecule permeable membranes, in particular to a water molecule permeable membrane, a preparation method thereof and application thereof in a water molecule humidifier.
Background
Air humidity has a significant impact on the comfort of the human body. The existing research shows that people are easy to have the symptoms of thirst, dry cough and the like under the relative humidity of less than 30 percent, and are easy to induce the diseases of sphagitis and the like. Therefore, it is helpful to the health that the environment is properly humidified in dry areas and dry seasons such as autumn and winter.
Existing humidifiers on the market include ultrasonic humidification, spray humidification, wet film humidification, steam humidification and the like. The application number 201710966759.9 (application publication number CN107575980A) of the chinese invention discloses an energy-saving ultrasonic humidifier, which preheats water in a refrigerator by effectively using heat of cooling fins of the refrigerator through heat collecting tubes, and then delivers the water to a water tank of the ultrasonic humidifier, and atomizes hot water by using high-frequency oscillation of the ultrasonic humidifier to improve air humidity, so that not only is the power consumption of the ultrasonic humidifier reduced, but also the cooling fins of the refrigerator are cooled. However, the ultrasonic humidifier humidifies by water mist, so that dust and bacteria are easily adsorbed, and the ultrasonic humidifier is not beneficial to the health of people. Similarly, the spray humidifier and the wet film humidifier can also generate water mist, and are particularly not beneficial to the low-resistance people such as the old, children and the like. Chinese utility model patent with application number 201621338728.6 (No. CN 206300307U) discloses a dry steam humidifier, which can effectively avoid the condition that the condensate water easily enters the nozzle to affect the humidification efficiency through a special structural design, and has a better steam-saving effect. However, the steam humidifier needs extra electric energy to heat the moisture, so that the energy consumption is high, and the emission of carbon dioxide is increased.
The water molecule permeable membrane developed by the invention has higher water molecule transmittance, and can be applied to a humidifier through reasonable design to obtain a water-mist-free and sterile water molecule humidifier.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the water molecule permeable membrane and the preparation method and the application thereof.
The invention adopts the following technical scheme:
a method for preparing a water molecule permeable membrane comprises the following steps:
adding a film forming substance of a polymer film and an antibacterial material into a solvent, uniformly mixing, filtering by a filter screen to obtain a coating solution, coating the coating solution on a hydrophobic porous base film by using an anilox roller, drying, and forming a hydrophilic polymer film on the hydrophobic porous base film to obtain the water molecule permeable film.
According to the invention, the water molecule permeable membrane comprises a hydrophobic porous base membrane and a hydrophilic polymer membrane coated on the hydrophobic porous base membrane, so that the water molecule permeable membrane has higher water molecule transmittance, can be used for a water molecule humidifier without water mist and bacteria, and has the advantages of energy conservation and health.
The film forming substance of the polymer film is an ethylene-vinyl acetate copolymer, the solvent is a mixed solvent composed of cyclohexane and isopropanol, and the mass ratio of the cyclohexane to the isopropanol is 60-80: 20-40, preferably, the ringThe mass ratio of hexane to isopropanol is 65-75: 25-35, most preferably, the mass ratio of the cyclohexane to the isopropanol is 70: 30. the antibacterial material is benzalkonium chloride. The mass ratio of the film forming substance, the antibacterial material and the solvent of the polymer film is 10: 0.0006 to 0.01: 70-110; more preferably 10: 0.001 to 0.005: 80-100, most preferably 10: 0.0026: 90. the conditions for uniform mixing are as follows: stirring is carried out for 18h to 30h, more preferably for 22h to 26h, and most preferably for 24 h. The water molecule permeable membrane is obtained by adopting specific film forming substances, antibacterial materials, solvents and the proportion of specific content, and the moisture permeability can reach 16.4 kg/(m)224h) The humidifier has high water molecule transmittance and can be used for water-mist-free and sterile water molecule humidifiers.
The film forming matter of the polymer film is polyurethane emulsion and a water-based curing agent, and the solvent is water. The antibacterial material is nano silver. The mass ratio of the polyurethane emulsion to the water-based curing agent to the antibacterial material to the solvent is 10: 0.5-5: 0.01-0.1: 10 to 50, more preferably 10: 1-3: 0.02-0.06: 20-36, most preferably 10: 2: 0.04: 28. the water molecule permeable membrane is obtained by adopting specific film forming substances, antibacterial materials, solvents and the proportion of specific content, and the moisture permeability can reach 18.3 kg/(m)224h) The humidifier has high water molecule transmittance and can be used for water-mist-free and sterile water molecule humidifiers.
The film forming substance of the polymeric membrane is sulfonated polyethersulfone, the solvent is N, N-dimethylformamide, and the antibacterial material is benzalkonium chloride. The mass ratio of the film forming substance, the antibacterial material and the solvent of the polymer film is 10: 0.0001 to 0.005: 70-110; more preferably 10: 0.0005 to 0.002: 80-100, most preferably 10: 0.00085: 90. the conditions for uniform mixing are as follows: stirring is carried out for 18h to 30h, more preferably for 22h to 26h, and most preferably for 24 h. The water molecule permeable membrane is obtained by adopting specific film forming substances, antibacterial materials, solvents and the proportion of specific content, and the moisture permeability can reach 21.5 kg/(m)224h) The humidifier has high water molecule transmittance and can be used for water-mist-free and sterile water molecule humidifiers.
The thickness of the hydrophilic polymer film is 0.1 to 500. mu.m, more preferably 0.1 to 10 μm.
The antibacterial material is one or more than two (including two) of nano-silver, graphene oxide/silver compound, benzalkonium chloride, zinc oxide and polyhexamethylene guanidine.
The hydrophobic porous base membrane has micropores with the diameter of 0.1-5 mu m, the porosity is 30-95%, and the preferred porosity is 80-90%.
The thickness of the hydrophobic porous base membrane is 10 to 500 μm, and more preferably 10 to 350 μm.
The hydrophobic porous base membrane is made of one or more (including two) of polyethylene, polypropylene, polyethylene terephthalate, polytetrafluoroethylene, polyvinylidene fluoride, nylon, cellulose and polyether sulfone.
The hydrophobic porous base membrane is a polyethylene microporous membrane, a polypropylene microporous membrane or a polyvinylidene fluoride microporous membrane.
The hydrophilic polymer film of the water molecule permeable film is contacted with tap water.
The water molecule permeable membrane comprises a hydrophobic porous base membrane and a hydrophilic polymer membrane coated on the hydrophobic porous base membrane, so that the water molecule permeable membrane has higher water molecule transmittance, can be used for a water molecule humidifier without water mist and bacteria, and has the advantages of energy conservation and health. The water molecule humidifier can be used for quickly diffusing tap water into the environment through the water molecule permeable membrane in the form of water molecules by applying the fan, and the tap water firstly quickly passes through the hydrophilic polymer membrane in the form of water molecules, then passes through the hydrophobic porous base membrane and then diffuses into the environment.
Compared with the prior art, the invention has the following advantages:
1. the hydrophobic porous base membrane has a porosity of up to 30-95%, preferably 80-90%, and a high porosity that enables rapid diffusion of water molecules into the environment. The aperture of the hydrophobic porous basement membrane is 0.1-5 μm, preferably 0.1-0.45 μm, which can effectively prevent the water mist from permeating. The porous base membrane is made of polyethylene, polypropylene, polyethylene terephthalate, polytetrafluoroethylene, polyvinylidene fluoride, nylon, cellulose, polyether sulfone and the like. The base film can also play a supporting role, and the structure of the humidifier is simplified.
2. The hydrophilic polymer film can accelerate the diffusion speed of water molecules in the porous base film.
3. The film forming material of the hydrophilic polymer film comprises acrylic acid copolymer, polyurethane, polyester elastomer, maleic anhydride-styrene copolymer, sulfonated polystyrene-butadiene copolymer, sulfonated polyphenyl ether, sulfonated polyether sulfone, sulfonated polyimide, amino resin, polyethylene vinyl acetate copolymer and the like, and the moisture permeability of the material is improved by utilizing functional groups such as high-polarity hydroxyl, carboxyl, carbonyl, sulfonic group, amino, amide and the like.
4. The hydrophilic polymer film contains 10-1000ppm of antibacterial materials such as nano silver, graphene oxide/silver compound, benzalkonium chloride, zinc oxide, polyhexamethylene guanidine and the like, and has good antibacterial and mildewproof effects.
5. The water molecule permeable membrane has the moisture permeability of 10-40kg/24h per square meter under the relative humidity of 30 ℃ and 50 percent, and has remarkable humidifying effect.
Drawings
FIG. 1 is a schematic view showing the structure of a water molecule permeable membrane according to the present invention.
Detailed Description
Example 1
10g of an ethylene-vinyl acetate copolymer (DuPont Dow., U.S.A., 40L-03) and 2.6mg of benzalkonium chloride (Kary chemical Co., Ltd., Zaozhuang) were added to 90g of a mixed solvent composed of 70 mass% cyclohexane and 30 mass% isopropyl alcohol at room temperature and 25 ℃ and stirred for 24 hours until completely dissolved. The coating solution was obtained by filtering through a 800-mesh sieve, and the coating solution having a thickness of 10 μm was applied to a polyethylene microporous membrane (Dupont Dow, Tyvek 1056, porosity: 80%) by means of an anilox roller and dried at 50 ℃ to obtain a water molecule permeable membrane.
Example 2
10g of a polyurethane emulsion (Wanhua chemical group,
1651) 2g of an aqueous curing agent
161 and 40mg of nano silver antibacterial agent (jin nano technology (Xiamen) Co., Ltd., JDTKS-001) were added to 28g of deionized water, and stirred until uniformly dispersed. Filtering with 200 mesh filter screen to obtain coating solution, coating 10 μm thick coating solution onto polypropylene microporous membrane (porosity of 85% in WUWA Huamei microporous membrane factory) with anilox roller, and drying at 80 deg.C to obtain water molecule permeable membrane.
Example 3
10g of sulfonated polyethersulfone (Kort chemical Co., Ltd., Changzhou) and 0.85mg of benzalkonium chloride (Kjeri chemical Co., Ltd., JDTKS-001, Zaozhuang) were added to 90g of N, N-dimethylformamide at room temperature of 25 ℃ and stirred for 24 hours until they were sufficiently dissolved. Filtering with 800 mesh filter screen to obtain coating solution, coating 10 μm thick coating solution onto polyvinylidene fluoride microporous membrane (Jiangsu blue sky Peyer Membrane Co., Ltd., porosity of 90%), and drying at 180 deg.C to obtain water molecule permeable membrane.
Comparative example 1
Polypropylene microporous membranes (turnip lake Huamei microporous membrane works) were used.
Comparative example 2
10g of styrene-butadiene copolymer (ba ling petrochemical YH-503) and 40mg of nanosilver antibacterial agent (jin Dai nanotechnology (Xiamen) Co., Ltd., JDTKS-001) were added to 90g of toluene at room temperature and 25 ℃ and stirred for 24 hours to be sufficiently dissolved. Filtering with 800 mesh screen, coating 10 μm thick solution onto polypropylene microporous membrane (porosity 85% in WUWA Huamei microporous membrane factory) with anilox roller, and drying at 120 deg.C to obtain composite membrane.
The raw materials and parameters of examples 1 to 3 are shown in Table 1.
TABLE 1
Moisture permeability test method: reference to GBT12704.2-2009 textile fabric moisture permeability test method part 2, at 23 ± 2 ℃, 50 ± 2% relative humidity: specific results of method B of the Evaporation method are shown in Table 2:
TABLE 2
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | |
| Moisture permeability kg/(m)224h) | 16.4 | 18.3 | 21.5 | 13.5 | 6.6 |
Therefore, the water molecule permeable membrane prepared by the invention has higher moisture permeability, can be used for obtaining the water molecule humidifier without water mist and bacteria, and has good application prospect. As shown in fig. 1, the water molecule permeable membrane includes a hydrophobic porous base membrane 3 and a hydrophilic polymer membrane 2 coated on the hydrophobic porous base membrane 3, and may be used in a water molecule humidifier, and tap water 1 may rapidly diffuse into the environment through the water molecule permeable membrane in the form of water molecules by using a fan, and the tap water 1 may rapidly diffuse into the environment through the hydrophilic polymer membrane 2 in the form of water molecules, and then pass through the hydrophobic porous base membrane 3.
Claims (2)
1. A preparation method of a water molecule permeable membrane is characterized by comprising the following steps:
adding a film forming substance of a polymer film and an antibacterial material into a solvent, uniformly mixing, filtering by a filter screen to obtain a coating solution, coating the coating solution on a hydrophobic porous base film by using an anilox roller, drying, and forming a hydrophilic polymer film on the hydrophobic porous base film to obtain a water molecule permeable film;
the film forming substance of the polymer film is sulfonated polyethersulfone, the solvent is N, N-dimethylformamide, the antibacterial material is benzalkonium chloride, and the mass ratio of the film forming substance of the polymer film to the antibacterial material to the solvent is 10: 0.0001 to 0.005: 70-110;
the water molecule permeable membrane comprises a hydrophobic porous base membrane and a hydrophilic polymer membrane coated on the hydrophobic porous base membrane;
the thickness of the hydrophilic polymer film is 0.1-10 μm;
the hydrophobic porous basement membrane has micropores of 0.1-5 mu m, and the porosity is 80-90%;
the thickness of the hydrophobic porous basement membrane is 10-350 μm;
the hydrophobic porous base membrane is a polyethylene microporous membrane, a polypropylene microporous membrane or a polyvinylidene fluoride microporous membrane.
2. The use of the water molecule permeable membrane manufactured by the manufacturing method according to claim 1 for manufacturing a water molecule humidifier, wherein water in the form of water molecules passes through the hydrophilic polymer membrane, then passes through the hydrophobic porous base membrane, and then diffuses into the environment.
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| CN109692573A (en) * | 2019-02-26 | 2019-04-30 | 深圳市诚荣环保科技有限公司 | A kind of TPU/SMA blended ultrafiltration membrane material |
| CN110420556B (en) * | 2019-07-26 | 2022-02-22 | 绍兴百立盛新材料科技有限公司 | Formaldehyde-removing total heat exchange membrane and preparation method thereof |
| CN110749014B (en) * | 2019-11-27 | 2023-09-29 | 广东美的制冷设备有限公司 | Humidification film for air conditioning equipment, preparation method of humidification film and air conditioning equipment |
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| CN113817218A (en) * | 2020-12-25 | 2021-12-21 | 北京蔚蓝天纳科技有限公司 | Biopolymer composite membrane and preparation method thereof |
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| US5837365A (en) * | 1996-04-08 | 1998-11-17 | The Penn State Research Foundation | Hydrophilic polypropylene membranes |
| CN102131567B (en) * | 2008-06-30 | 2017-05-31 | 3M创新有限公司 | The method for forming hydrophilic film |
| US8091868B2 (en) * | 2008-07-23 | 2012-01-10 | GM Global Technology Operations LLC | WVT design for reduced mass and improved sealing reliability |
| JP2012206062A (en) * | 2011-03-30 | 2012-10-25 | Nihon Gore Kk | Composite membrane |
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| CN102458625A (en) * | 2009-05-18 | 2012-05-16 | 迪博因特技术公司 | Coated membranes for enthalpy exchange and other applications |
| CN105848766A (en) * | 2013-12-27 | 2016-08-10 | 日东电工株式会社 | Water vapor permeable filtration material |
| CN106492654A (en) * | 2015-09-07 | 2017-03-15 | 中山市创思泰新材料科技股份有限公司 | A kind of multifunctional graphite vinyl/polymer composite water permeable membrane and its production and use |
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