CN214727067U - Recyclable self-floating flexible photo-thermal composite material for solar interface water evaporation - Google Patents
Recyclable self-floating flexible photo-thermal composite material for solar interface water evaporation Download PDFInfo
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- CN214727067U CN214727067U CN202022623846.4U CN202022623846U CN214727067U CN 214727067 U CN214727067 U CN 214727067U CN 202022623846 U CN202022623846 U CN 202022623846U CN 214727067 U CN214727067 U CN 214727067U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
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Abstract
The utility model relates to a solar energy interface water evaporates with circulating from floating flexible light and heat combined material, combined material is light and heat conversion layer (1), heat reflection layer (2) and thermal-insulated supporting layer (3) from top to bottom respectively. The utility model discloses a thermal-insulated, support and water evaporation's integration has advantages such as with low costs, stability is good, from floating and circulated use, and convenient application and scale preparation.
Description
Technical Field
The utility model relates to a light and heat combined material field especially relates to a solar energy interface water evaporates with circulated flexible light and heat combined material that floats certainly.
Background
The design of a solar interfacial water evaporation system generally needs to take effective light absorption, moisture transmission and heat management and utilization into consideration, and also needs to take cost control and large-scale preparation into consideration in the system design in consideration of practical application performance. At present, researchers are rich in the four aspects, various different photo-thermal materials including plasma nano materials, semiconductor nano materials, nano carbon materials, polymer nano materials and the like are used for solar seawater desalination, the researchers improve the water supply efficiency by optimizing a water delivery channel, the heat conduction loss of heat to a water body is effectively reduced by introducing low-heat-conduction low-density materials such as polystyrene foam, polyurethane sponge, wood, aerogel and the like as heat insulation supporting layers, and the material cost is reduced by selecting cheap paper and textile fabrics.
Patent CN110846896A discloses a method for preparing a textile material for photothermal seawater desalination, which selects nonwoven polypropylene as a heat insulation layer, a water channel and a photothermal water evaporation layer, although it has the advantages of low cost and certain reusability, the heat insulation effect of the polypropylene heat insulation layer is worried under the condition of water immersion, and the heat loss cannot be effectively reduced. Patent CN111282443A discloses a membrane material for solar interface evaporation seawater desalination and a preparation method thereof, wherein a photo-thermal membrane material is prepared by adopting processes such as electrostatic spinning, in-situ imidization, laser ablation and the like, but the preparation process of the membrane material is more complex and has poor recycling property. Patent CN207016517U discloses a novel solar photo-thermal seawater evaporation device, which has the advantages of low cost, recycling and avoiding the influence of salt precipitation on the photo-thermal conversion performance, but the water delivery channel of the method utilizes the wicking effect of hydrophilic fabric, and the wicking height of the hydrophilic fabric is limited, so that the device cannot be applied to seawater desalination treatment of a large area. In addition, a Recyclable flexible photothermal material was prepared in a paper (Recyclable CNT-coated fiber fabrics for low-cost and efficient recycling of seawater under bright, desalinization, 2019), and a durable corrosion-resistant nanofiber photothermal film was prepared in a paper (a mechanical durable photothermal fibrous membrane for high efficiency fiber optic membrane, Journal of Materials Chemistry a, 2019), but these photothermal Materials all need to be additionally supported on a separate thermal insulation support foam for use, that is, the integration of the photothermal layer and the thermal insulation support layer was not realized, and the convenience of use was reduced.
Disclosure of Invention
The utility model aims to solve the technical problem that the use that exists to the light and heat combined material for the evaporation of current solar energy interface water is inconvenient and the scale production scheduling problem of not being convenient for that the circulated performance is poor, the pliability is poor, bring because of the separation of light and heat insulation material.
The utility model provides a recyclable self-floating flexible photo-thermal composite material for solar interface water evaporation, which is a photo-thermal conversion layer, a thermal reflection layer and a thermal insulation support layer from top to bottom; the photothermal conversion layer is a double-layer fabric with a unidirectional moisture conducting function, the outer layer is a drainage evaporation layer, the surface of the outer layer is printed with photothermal conversion materials, and the inner layer is a meshed water conducting layer; the heat reflecting layer and the heat insulation supporting layer are adhered through hot melting and are provided with a plurality of through holes; and the heat reflecting layer and the heat insulation supporting layer are compounded with the light-heat conversion layer through hot melt adhesive after being subjected to hot melt adhesion.
The gram weight of the double-layer fabric with the unidirectional moisture-conducting function is 150-220g/m2。
The drainage evaporation layer is constructed by hydrophilic polyester yarns and is subjected to photo-thermal printing treatment.
Printing slurry containing photo-thermal materials is selected for photo-thermal printing and is printed on the outer layer of the double-layer fabric in a screen printing mode. The photo-thermal material comprises any one of nano graphite powder, nano carbon black, black titanium dioxide, graphene oxide and carbon nano tubes.
The mesh-shaped water guide layer is constructed by water-repellent polypropylene or water-repellent polyester yarns.
The heat reflection layer is made of polyester woven fabric with a heat reflection coating on one side, and the side with the heat reflection coating faces outwards. The heat reflection layer is printed on one side contacted with the photothermal conversion layer in a coating mode, and can effectively reflect heat radiation generated by the photothermal conversion layer, so that heat is concentrated on the photothermal conversion layer, and the water evaporation efficiency is improved.
The gram weight of the polyester woven fabric is 80-120g/m2。
The gram weight of the heat insulation supporting layer is 135-270g/m2. The heat insulation supporting layer is a water-repellent flexible foaming heat insulation material, and the foaming base material is polyimide. The thickness of the heat insulation supporting layer is 3-6mm, the heat insulation supporting layer can be selected according to specific environments, and the heat conductivity is less than 0.03W/(m.k).
The length and the width of the heat reflecting layer and the heat insulation supporting layer are the same and are both larger than the photothermal conversion layer. And compounding the heat reflecting layer, the heat insulation supporting layer and the photothermal conversion layer by using a hot melt adhesive to obtain the integrated flexible photothermal composite material. The hot melt adhesive can be selected from any one of PA, PES, TPU and PUR.
The through holes are circular, the aperture size is 5-10mm, and the area of the open holes accounts for 10-15% of the total area of the composite material.
The utility model discloses double-deck surface fabric with one-way wet function that leads combines the bottom to punch the design and is superior to the scheme that all cotton or other hydrophilic surface fabric used in partial research and the patent were by drawing water all around, and the leading cause includes: (1) and (4) optimizing moisture transmission. The moisture transmission of hydrophilic fabrics such as cotton mainly depends on the capillary effect of hydrophilic fabrics, and because the wicking height of the fabrics is limited, when the area of the photothermal conversion layer is large, water is difficult to be conveyed to the whole photothermal conversion surface from the periphery. The scheme of opening the hole at the bottom can ensure the rapid transmission of the moisture from the bottom layer to the photothermal conversion layer; (2) and (4) optimizing a water evaporation surface. The moisture transmission of the hydrophilic fabric such as cotton is carried out on the whole cross section of the fabric, the inner layer of the unidirectional moisture-conducting fabric is hydrophobic, the moisture transmission and diffusion are mainly concentrated on the outer layer, the amount of surface water to be evaporated is further reduced, and the evaporation of locally heated water is facilitated; (3) and the water evaporation efficiency is improved. The hydrophilic fabrics such as cotton and the like have good hygroscopicity and poor quick drying property, the binding force between water molecules and fabrics is firmer, the energy consumption of water evaporation is higher, the hydrophilic terylene on the outer layer has better quick drying property, and the energy required by water evaporation is less.
On the other hand, the combination of the heat insulation support layer and the heat reflection layer can passively reduce heat loss caused by heat conduction to a lower water body, and can actively reflect the heat to the light-heat conversion layer, so that the heat is more concentrated on water evaporation.
Advantageous effects
(1) The utility model discloses a chooseing for use the double-deck surface fabric that has one-way wet function of leading and combining the design that the bottom punched, having optimized the moisture transmission passageway, utilize the one-way excellent capillary effect of leading wet surface fabric, can be with bottom moisture rapid transfer to light and heat conversion layer.
(2) The utility model discloses choose for use the double-deck surface fabric that has one-way wet function of leading to be favorable to collecting the water of waiting to evaporate on the surface fabric top layer, the selection of quick-drying surface fabric is favorable to reducing the cohesion between hydrone and the surface fabric simultaneously, improves the efficiency of light and heat water evaporation.
(3) The utility model discloses the dual function of well heat reflection layer and insulating layer can separate the heat effectively to scattering and disappearing of water, promotes the heat and concentrates the application at light-heat conversion layer, is favorable to going on of water evaporation.
(4) The utility model discloses the three-layer material of chooseing for use is flexible material, adopts weaving composite technology to realize thermal-insulated, support and the integration of water evaporation, has advantages such as with low costs, stability is good, from floating and circulated use, and convenient application and scale preparation.
Drawings
Fig. 1 is a schematic structural view (side view) of the present invention;
FIG. 2 is a schematic view of a structure of a light-to-heat conversion layer according to the present invention;
FIG. 3 is a schematic view (top view) of the thermal insulation support layer and the thermal reflective layer after composite perforation according to the present invention;
fig. 4 is a schematic diagram (longitudinal sectional view) of the thermal insulation support layer and the thermal reflection layer after composite punching.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
Example 1
The embodiment of the utility model relates to a solar energy interface water evaporates uses the flexible light and heat combined material of circulated self-floating, the combined material from top to bottom is light and heat conversion layer 1, heat reflection layer 2 and thermal-insulated supporting layer 3 respectively; the photothermal conversion layer 1 is a double-layer fabric with a unidirectional moisture conducting function, the outer layer is a drainage evaporation layer 101, the surface of the outer layer is printed with photothermal conversion materials, and the inner layer is a mesh-shaped water guide layer 102; the heat reflecting layer 2 and the heat insulation supporting layer 3 are adhered by hot melting and are provided with a plurality of through holes 201; and the heat reflecting layer 2 and the heat insulation supporting layer 3 are compounded with the photothermal conversion layer 1 through hot melt adhesive after being subjected to hot melt adhesion.
The drainage evaporation layer 101 is constructed by hydrophilic polyester yarns and is subjected to photo-thermal printing treatment. The mesh-like water-conductive layer 102 is constructed of water-repellent polypropylene yarns. The gram weight of the double-layer fabric with the one-way moisture-conducting function is 200g/m2. The photo-thermal material adopted in the photo-thermal printing is a carbon nano tube, the printing mode adopts flat screen printing, and the mesh number of the screen printing plate is 120 meshes.
The heat reflection layer 2 is a polyester woven fabric with a heat reflection coating on one side, and the gram weight of the fabric is 100g/m2And printing a heat reflection coating on the single side of the fabric by adopting a coating machine. The heat reflective coating layer faces a side contacting with the light-to-heat conversion layer 1, and can effectively reflect heat radiation generated from the light-to-heat conversion layer 1, thereby concentrating heat on the light-to-heat conversion layer 1 and improving water evaporation efficiency.
The heat insulation supporting layer 3 is a water-repellent flexible foaming heat insulation material, and the foaming base material is polyimide. The selected base material has a thickness of 5mm and a gram weight of 225g/m2The thermal conductivity is less than 0.03W/(m.k).
The length and the width of the heat insulation supporting layer 3 and the heat reflecting layer 2 are the same and are slightly larger than those of the photothermal conversion layer. The heat insulating support layer 3 and the heat reflective layer 2 are laminated together by thermal fusion bonding, with the side provided with the heat reflective coating facing outward. Then, the composite material was perforated to have a circular hole shape with a hole diameter of 10mm, and the area of the open hole occupied 15% of the total area of the composite material. And finally, compounding the composite fabric and the photothermal conversion layer by using a hot melt adhesive to obtain the recyclable self-floating flexible photothermal composite material for solar interfacial water evaporation. The selected hot melt adhesive is a PUR hot melt adhesive.
The prepared photo-thermal composite material is used for the solar interface water evaporation test, and the result shows that: the illumination intensity is 1kW/m2Under the irradiation conditions, the vapor generation rate of the photothermal composite material in the steady-state stage of solar water evaporation is 1.76kg/m2H, steam generation efficiency can reach 90.4%. The material was recycled and washed with water 50 times, and then tested again for its performance, steam generation rateThe rate can still reach 1.68kg/m2H, the steam generation efficiency is 86.3%, which shows that the photo-thermal material has good photo-thermal water evaporation performance and recycling performance.
Claims (7)
1. The utility model provides a solar energy interface water evaporates with circulated flexible light and heat combined material that floats certainly which characterized in that: the composite material comprises a light-heat conversion layer (1), a heat reflection layer (2) and a heat insulation supporting layer (3) from top to bottom respectively; the photothermal conversion layer (1) is a double-layer fabric with a unidirectional moisture conducting function, the outer layer is a drainage evaporation layer (101), the surface of the outer layer is printed with photothermal conversion materials, and the inner layer is a meshed water conducting layer (102); the heat reflection layer (2) and the heat insulation support layer (3) are bonded through hot melting and provided with a plurality of through holes (201); the heat reflecting layer (2) and the heat insulation supporting layer (3) are compounded with the photothermal conversion layer (1) through hot melt after being subjected to hot melt adhesion.
2. The photothermal composite according to claim 1, wherein: the gram weight of the double-layer fabric with the unidirectional moisture-conducting function is 150-220g/m2。
3. The photothermal composite according to claim 1, wherein: the heat reflection layer (2) is a full-polyester woven fabric with a heat reflection coating on one side.
4. The photothermal composite according to claim 3, wherein: the gram weight of the polyester woven fabric is 80-120g/m2。
5. The photothermal composite according to claim 1, wherein: the gram weight of the heat insulation supporting layer (3) is 135-270g/m2。
6. The photothermal composite according to claim 1, wherein: the length and the width of the heat reflecting layer (2) and the heat insulation supporting layer (3) are the same and are both larger than the photothermal conversion layer (1).
7. The photothermal composite according to claim 1, wherein: the through holes (201) are circular, the aperture size is 5-10mm, and the area of the open holes accounts for 10-15% of the total area of the composite material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619748A (en) * | 2022-03-14 | 2022-06-14 | 中原工学院 | Carbon nanotube-based unidirectional moisture-conducting photothermal film, preparation method and prepared solar interface evaporation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619748A (en) * | 2022-03-14 | 2022-06-14 | 中原工学院 | Carbon nanotube-based unidirectional moisture-conducting photothermal film, preparation method and prepared solar interface evaporation device |
| CN114619748B (en) * | 2022-03-14 | 2023-06-09 | 中原工学院 | Carbon nano tube based unidirectional moisture-guiding photo-thermal film, preparation method and solar interface evaporation device prepared by same |
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