Preparation method of wood wedge-shaped surface capable of directionally conveying water and mist collecting device

Abstract

The invention belongs to the technical field of wood functional modification, and discloses a preparation method of a wood wedge-shaped surface capable of achieving directional moisture transmission and a mist collecting device.The preparation method comprises the following steps that wood of a longitudinal section is cut into wedge-shaped wood; the wedge-shaped wood is placed in deionized water for ultrasonic cleaning, and after cleaning is completed, the wedge-shaped wood is taken out and dried; the dried wedge-shaped wood is subjected to delignification treatment; the wedge-shaped wood subjected to delignification treatment is soaked in a modified resin solution, and after soaking is completed, the wedge-shaped wood is taken out to be cleaned and dried, so that grooves are formed in the surface of the wedge-shaped wood; the wedge-shaped wood with the grooves formed in the surface is placed in a hydrophobic modification solution to be soaked, after soaking is completed, the wedge-shaped wood is taken out to be cleaned and dried, and the super-hydrophobic wedge-shaped wood is obtained; according to the preparation method, the wood wedge-shaped surface can be processed and prepared under the condition of not depending on a high-cost micro-nano processing technology, and the preparation method has the characteristics of low cost and high efficiency, and can be used for batch production.

Description

Technical Field

[0001] The invention belongs to the technical field of wood functional modification, and in particular relates to a preparation method of a wood wedge-shaped surface for directional moisture transmission and a mist collecting device. Background Art

[0002] In nature, many organisms demonstrate highly evolved directional liquid transport capabilities, such as spider webs that achieve unidirectional water droplet movement through microstructures, and cactus thorns and the backs of desert beetles that efficiently collect water. These organisms have inspired the development of artificial surface design and promoted applications in fields such as microfluidics, energy harvesting, and water resource management. However, how to effectively replicate the complex and efficient liquid transport mechanisms in nature in artificial systems remains a huge challenge. Current research on liquid directional transport materials mainly focuses on metals, polymers, and silicon-based materials; metals (such as copper and aluminum) are widely used to construct gradient surfaces due to their excellent mechanical strength and thermal conductivity, but their processing is complex and environmentally unfriendly; polymer materials (such as PDMS and PTFE) are favored for their easy processing and surface chemical customizability, but their durability in long-term use is poor; although silicon-based materials are compatible with micro-nano processing technology, their processing equipment is expensive and chemical reagents have potential environmental hazards, which limits their development in large-scale applications;

[0003] In terms of structural design, conical and wedge-shaped structures are commonly used geometric forms, which drive the directional motion of droplets through the Laplace pressure gradient generated by the curvature difference; however, these designs usually rely on complex micro-nano processing processes such as laser etching and chemical vapor deposition, which are not only costly but also face major challenges in sustainable applications.

[0004] In sharp contrast, wood, with its unique microstructure and sustainability, has shown great potential in directional liquid transport. As a natural material, the porous network and anisotropic structure of wood provide an ideal basis for constructing liquid transport channels. The vessels and tracheids inside the wood form longitudinally arranged channels, which can achieve rapid liquid flow with less resistance. In addition, the difference in density and porosity between earlywood and latewood of wood gives it a unique ability to regulate liquid transport. For example, the thin-walled cells of earlywood contribute to efficient liquid conduction, while the thick-walled cells of latewood effectively regulate the flow rate. This natural hierarchical structure can realize the liquid transport function without complex processing. Although wood has significant advantages in the field of liquid transport, its development still has some shortcomings, such as the lack of controllability of the surface properties of natural wood. Therefore, a method for preparing a wooden wedge surface for directional moisture transport and a mist collection device are provided. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for preparing a wooden wedge-shaped surface for directional moisture transport, so that the processing and preparation of the wooden wedge-shaped surface for directional moisture transport can be achieved without relying on high-cost micro-nano processing technology. The preparation method has the characteristics of low cost and high efficiency, can be mass-produced, and can achieve rapid directional transport of droplets through the wooden wedge-shaped surface for directional moisture transport.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A method for preparing a wooden wedge-shaped surface for directional moisture transmission comprises the following steps:

[0008] Cutting the longitudinally sectioned timber into wedge-shaped timbers;

[0009] The wedge-shaped wood is ultrasonically cleaned in deionized water, and after the cleaning is completed, the wedge-shaped wood is taken out and dried;

[0010] The dried wedge-shaped wood is subjected to a delignification treatment;

[0011] The delignified wedge-shaped wood is immersed in a modified resin solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying, so that grooves are formed on the surface of the wedge-shaped wood;

[0012] The wedge-shaped wood with grooves formed on the surface is immersed in a hydrophobic modification solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying to obtain a super-hydrophobic wedge-shaped wood;

[0013] The ultraviolet lamp and the light shielding film are used to irradiate the super-hydrophobic wedge-shaped wood, so that the surface of the wedge-shaped wood has a gradient wettability, and a finished wedge-shaped wood with a wood wedge-shaped surface for directional water transmission is obtained;

[0014] The dried wedge-shaped wood is subjected to a delignification treatment, which specifically comprises the following steps:

[0015] The dried wedge-shaped wood was immersed in a 1wt% NaClO2 solution;

[0016] The pH value of 1 wt% NaClO2 solution was adjusted to 4.6;

[0017] Soak in 1wt% NaClO2 solution at 80℃ for 6 hours;

[0018] After the soaking is completed, the wedges are taken out and repeatedly rinsed with deionized water until they are neutral;

[0019] The wedge-shaped wood is washed with anhydrous ethanol, and after washing, the wedge-shaped wood is freeze-dried to obtain delignified wedge-shaped wood;

[0020] The delignified wedge-shaped wood is immersed in a modified resin solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying, so that grooves are formed on the surface of the wedge-shaped wood. Specifically, the following steps are included:

[0021] Add 0.5-2 g of polyvinylidene fluoride-hexafluoropropylene to 50-100 mL of dimethylformamide, and stir until the polyvinylidene fluoride-hexafluoropropylene is completely dissolved to obtain a modified resin solution;

[0022] The delignified wedge-shaped wood is immersed in the modified resin solution for 6-12 hours;

[0023] After the impregnation is completed, take out the wedge-shaped wood and clean it with anhydrous ethanol;

[0024] After cleaning, the wedge-shaped wood is dried to obtain a wedge-shaped wood with grooves on the surface;

[0025] The wedge-shaped wood with grooves formed on the surface is immersed in a hydrophobic modification solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying to obtain a super-hydrophobic wedge-shaped wood, which specifically includes the following steps:

[0026] The hydrophobic agent is mixed with TiO2 nanoparticles and dissolved in an ethanol solution with a concentration of 10-40wt% to obtain a hydrophobic modified solution;

[0027] The grooved wedge-shaped wood is immersed in the hydrophobic modification solution for 1-3 hours;

[0028] After the impregnation is completed, take out the wedge-shaped wood and clean it with anhydrous ethanol;

[0029] After cleaning, the wedge-shaped wood is dried to obtain a super-hydrophobic wedge-shaped wood;

[0030] When the hydrophobic agent is mixed with TiO2 nanoparticles, the mass of the TiO2 nanoparticles is 2-4 times the mass of the hydrophobic agent;

[0031] The hydrophobic agent is any one of 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane, vinyl triethoxysilane, hexadecyl trimethoxysilane, polydimethylsiloxane, and alkyl isocyanate;

[0032] The particle size of TiO2 nanoparticles is 100-200nm;

[0033] By using a UV lamp and a light shielding film to irradiate a super-hydrophobic wedge-shaped wood, the surface of the wedge-shaped wood has a gradient wettability, and a finished wedge-shaped wood with a wood wedge-shaped surface for directional water transmission is obtained, which specifically includes the following steps:

[0034] The UV lamp emits UV light with a wavelength of 365 nm and the light intensity is set to 0.35 W / m 2 ;

[0035] Place the superhydrophobic wood wedge horizontally under a UV lamp;

[0036] A light-shielding film is placed between the super-hydrophobic wedge-shaped wood and the ultraviolet lamp, and the light-shielding film completely covers the super-hydrophobic wedge-shaped wood;

[0037] The ultraviolet lamp is turned on to irradiate the shading film, and the shading film is uniformly moved along the wide end of the super-hydrophobic wedge-shaped wood toward the tip of the super-hydrophobic wedge-shaped wood, so that the surface of the wedge-shaped wood has gradient wettability, and a finished wedge-shaped wood with a wooden wedge-shaped surface for directional moisture transmission is obtained.

[0038] A mist collecting device for a wedge-shaped surface of wood for directional moisture transmission comprises a finished wedge-shaped wood prepared by a method for preparing a wedge-shaped surface of wood for directional moisture transmission, and also comprises a pair of symmetrically placed support plates, a horizontally placed rotating shaft being rotatably connected between the two support plates, the finished wedge-shaped wood being fixed to a peripheral wall at the upper end of the rotating shaft, and the wide end to the tip of the finished wedge-shaped wood being placed perpendicular to the rotating shaft, the finished wedge-shaped wood being located between the two support plates, a counterweight roller being fixed to the lower end surface of the finished wedge-shaped wood and being placed coaxially with the rotating shaft, the counterweight roller being located on a side of the rotating shaft close to the tip of the finished wedge-shaped wood, and the counterweight roller being located on the upper end of the support plate, a vertically placed live cactus thorn being fixed to the upper end surface of the tip of the finished wedge-shaped wood, a collecting cylinder with an upper end opening being provided on one side of the two support plates, and the collecting cylinder being located directly below the wide end of the finished wedge-shaped wood.

[0039] Beneficial effects of the present invention:

[0040] 1. The present invention is based on natural wood, and the longitudinal section of the wood is processed into wedge-shaped wood, making full use of the complex hierarchical structure formed by the arrangement of natural vessels and tracheids. After removing lignin through delignification treatment, the early wood and late wood on the wood surface naturally form regular micro-groove structures due to the differences in density and shrinkage characteristics during the subsequent resin impregnation and drying process. The early wood shows more significant volume changes during impregnation due to its thin-walled cells and larger porosity, while the late wood has a denser wall structure and a lower shrinkage degree. The synergistic effect of the two promotes the formation of surface grooves; at the same time, through ultraviolet radiation combined with the control of the movement of the shading film The system realizes the construction of a gradient wettability surface from the bottom to the top. Compared with traditional materials such as metal, plastic or silicon-based materials, wood, as a natural organic polymer material, has the advantages of abundant resources, low processing cost and strong renewability. Its unique microstructure and natural grading characteristics of early and late wood make it possible to achieve complex geometry and surface functionalization without relying on high-cost micro-nano processing technology. The finished wedge-shaped wood has the characteristics of low cost and high efficiency, and can be mass-produced. The synergistic effect of the gradient wettability surface and the groove structure of the wood wedge surface through the directional water transport can realize the rapid directional transport of droplets.

[0041] 2. The droplets in the air are efficiently captured by the live cactus thorns, and the synergistic effect of the gradient wettability surface and the groove structure of the wooden wedge surface for directional water transmission is used to achieve rapid directional transport of the droplets. At the same time, as the droplets accumulate, the droplets drive the finished wedge-shaped wood and the rotating shaft to flip toward the end of the collecting cylinder, so that the droplets fall into the collecting cylinder. After the droplets fall, the counterweight roller drives the finished wedge-shaped wood to automatically reset, which can effectively ensure the continuous operation of the device. Compared with the existing mist collection device, the present invention not only improves the efficiency of droplet collection and liquid transportation, but also reduces the complexity and operating cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 is a flow chart of the method for preparing a wood wedge-shaped surface for directional moisture transmission of the present invention;

[0044] Figure 2 Schematic diagram of ultraviolet light irradiating a light shielding film and a super-hydrophobic wedge-shaped wood according to the present invention;

[0045] Figure 3 is a schematic diagram of a mist collecting device of the present invention;

[0046] Figure 4 It is a flow chart of the working state of the mist collecting device of the present invention.

[0047] In the figure, 1. UV lamp; 2. Shading film; 3. Super-hydrophobic wedge-shaped wood; 4. Live cactus thorns; 5. Support plate; 6. Counterweight roller; 7. Rotating shaft. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figures 1 to 4 A method for preparing a wooden wedge-shaped surface for directional moisture transmission is shown, comprising the following steps:

[0050] Cutting the longitudinally sectioned timber into wedge-shaped timbers;

[0051] The wedge-shaped wood is ultrasonically cleaned in deionized water, and after the cleaning is completed, the wedge-shaped wood is taken out and dried;

[0052] The dried wedge-shaped wood is subjected to a delignification treatment;

[0053] The delignified wedge-shaped wood is immersed in a modified resin solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying, so that grooves are formed on the surface of the wedge-shaped wood;

[0054] The wedge-shaped wood with grooves formed on the surface is immersed in a hydrophobic modification solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying to obtain a super-hydrophobic wedge-shaped wood 3;

[0055] The ultraviolet lamp 1 and the light shielding film 2 are used to irradiate the super-hydrophobic wedge-shaped wood 3, so that the surface of the wedge-shaped wood has a gradient wettability, and a finished wedge-shaped wood with a wood wedge-shaped surface for directional water transmission is obtained;

[0056] Preferably, the ultrasonic cleaning of the wedge-shaped wood in deionized water takes place for 15 minutes, and after the cleaning is completed, the wedge-shaped wood is taken out and dried in a hot air drying oven at 50° C. for 3 hours;

[0057] Preferably, the distance between the wide end and the tip of the wedge-shaped wood is 20-50 mm, the width of the wide end of the wedge-shaped wood is 3-10 mm, the thickness of the wedge-shaped wood is 2-5 mm, and the wedge angle is set to 5°-15°;

[0058] The invention is based on natural wood, selects the longitudinal section of the wood to be processed into wedge-shaped wood, makes full use of the complex hierarchical structure formed by the arrangement of natural vessels and tracheids, removes lignin through delignification treatment, and naturally forms regular micro-groove structures on the surface of the wood due to differences in density and shrinkage characteristics during the subsequent resin impregnation and drying process. The early wood exhibits more significant volume changes during impregnation due to its thin-walled cells and larger porosity, while the late wood has a denser wall structure and a lower shrinkage degree. The synergistic effect of the two promotes the formation of surface grooves. At the same time, through ultraviolet light, Light radiation is combined with the control of the movement of the shading film 2 to achieve the construction of a gradient wettability surface from bottom to top. Compared with traditional materials such as metals, plastics or silicon-based materials, wood, as a natural organic polymer material, has the advantages of abundant resources, low processing costs, and strong renewability. Its unique microstructure and natural grading characteristics of early and late wood make it possible to achieve complex geometry and surface functionalization without relying on high-cost micro-nano processing technology. The preparation of wedge-shaped wood has the characteristics of low cost and high efficiency, and can be mass-produced, providing an environmentally friendly and economical solution for liquid management technology.

[0059] The dried wedge-shaped wood is subjected to a delignification treatment, which specifically comprises the following steps:

[0060] The dried wedge-shaped wood was immersed in a 1wt% NaClO2 solution;

[0061] The pH value of 1 wt% NaClO2 solution was adjusted to 4.6;

[0062] Soak in 1wt% NaClO2 solution at 80℃ for 6 hours;

[0063] After the soaking is completed, the wedges are taken out and repeatedly rinsed with deionized water until they are neutral;

[0064] The wedge-shaped wood is washed with anhydrous ethanol, and after washing, the wedge-shaped wood is freeze-dried to obtain delignified wedge-shaped wood;

[0065] Preferably, the pH value of the 1wt% NaClO2 solution can be adjusted by adding acetic acid;

[0066] Preferably, the freeze-drying temperature is -40°C, the pressure is 0.01 MPa, and the freeze-drying time is 12 hours.

[0067] The delignified wedge-shaped wood is immersed in a modified resin solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying, so that grooves are formed on the surface of the wedge-shaped wood. Specifically, the following steps are included:

[0068] Add 0.5-2 g of polyvinylidene fluoride-hexafluoropropylene to 50-100 mL of dimethylformamide, and stir until the polyvinylidene fluoride-hexafluoropropylene is completely dissolved to obtain a modified resin solution;

[0069] The delignified wedge-shaped wood is immersed in the modified resin solution for 6-12 hours, preferably, immersed under a vacuum pressure of 0.095 MPa;

[0070] After the impregnation is completed, take out the wedge-shaped wood and clean it with anhydrous ethanol;

[0071] After cleaning, the wedge-shaped wood is dried to obtain a wedge-shaped wood with grooves on the surface;

[0072] Preferably, the dimethylformamide after adding the polyvinylidene fluoride-hexafluoropropylene can be stirred for 1 hour in a water bath at 60° C. to completely dissolve the polyvinylidene fluoride-hexafluoropropylene;

[0073] Preferably, after being immersed in the modified resin solution, the wedge-shaped wood is taken out and washed with anhydrous ethanol, and then dried in a hot air drying oven at 40° C. for 8 hours.

[0074] The wedge-shaped wood with grooves formed on the surface is immersed in a hydrophobic modification solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying to obtain a super-hydrophobic wedge-shaped wood 3, which specifically includes the following steps:

[0075] The hydrophobic agent is mixed with TiO2 nanoparticles and dissolved in an ethanol solution with a concentration of 10-40wt% to obtain a hydrophobic modified solution;

[0076] The grooved wedge-shaped wood is immersed in the hydrophobic modification solution for 1-3 hours;

[0077] After the impregnation is completed, take out the wedge-shaped wood and clean it with anhydrous ethanol;

[0078] After cleaning, the wedge-shaped wood is dried to obtain super-hydrophobic wedge-shaped wood 3;

[0079] Preferably, after the grooved wedge-shaped wood is immersed in the hydrophobic modification solution, the wedge-shaped wood is cleaned with anhydrous ethanol and then dried in a hot air drying oven at 60° C. for 8 hours to obtain a super-hydrophobic wedge-shaped wood 3 .

[0080] When the hydrophobic agent is mixed with TiO2 nanoparticles, the mass of the TiO2 nanoparticles is 2-4 times the mass of the hydrophobic agent;

[0081] The hydrophobic agent is any one of 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane, vinyl triethoxysilane, hexadecyl trimethoxysilane, polydimethylsiloxane, and alkyl isocyanate;

[0082] The particle size of TiO2 nanoparticles is 100-200nm;

[0083] The ultraviolet lamp 1 and the light shielding film 2 are used to irradiate the super-hydrophobic wedge-shaped wood 3, so that the surface of the wedge-shaped wood has a gradient wettability, and a finished wedge-shaped wood with a wood wedge-shaped surface for directional water transmission is obtained, which specifically includes the following steps:

[0084] UV lamp 1 emits UV light with a wavelength of 365nm and a light intensity of 0.35W / m 2 ;

[0085] Place the super-hydrophobic wedge-shaped wood 3 horizontally under the ultraviolet lamp 1;

[0086] A light shielding film 2 is placed between the super-hydrophobic wedge-shaped wood 3 and the ultraviolet lamp 1, and the light shielding film 2 completely covers the super-hydrophobic wedge-shaped wood 3;

[0087] Turning on the ultraviolet lamp 1 to irradiate the light shielding film 2, and moving the light shielding film 2 at a uniform speed along the wide end of the super-hydrophobic wedge-shaped wood 3 toward the tip of the super-hydrophobic wedge-shaped wood 3, so that the surface of the wedge-shaped wood has a gradient wettability, and a finished wedge-shaped wood with a wood wedge surface for directional moisture transmission is obtained;

[0088] Preferably, the shading film 2 can be driven by a stepper motor or a linear slide rail, and the moving speed of the shading film 2 is 2-10 mm / h;

[0089] Preferably, the shading film 2 is a light-proof film material, any one of aluminum foil film, copper foil film, polyimide film, high-density polyethylene film, polypropylene film, light-proof black kraft paper, and black graphite paper.

[0090] A mist collecting device for a wedge-shaped surface of wood for directional moisture transmission, comprising a finished wedge-shaped wood prepared by a method for preparing a wedge-shaped surface of wood for directional moisture transmission, and also comprising a pair of symmetrically placed support plates 5, a horizontally placed rotating shaft 7 being rotatably connected between the two support plates 5, the finished wedge-shaped wood being fixed to the circumferential wall of the upper end of the rotating shaft 7, and the wide end to the tip of the finished wedge-shaped wood being placed perpendicular to the rotating shaft 7, the finished wedge-shaped wood being located between the two support plates 5, a counterweight roller 6 being placed coaxially with the rotating shaft 7 being fixed to the lower end surface of the finished wedge-shaped wood, the counterweight roller 6 being located on a side of the rotating shaft 7 close to the tip of the finished wedge-shaped wood, and the counterweight roller 6 being located at the upper end of the support plates 5, a vertically placed live cactus thorn 4 being fixed to the upper end surface of the tip of the finished wedge-shaped wood, a collecting cylinder with an upper end opening being provided on one side of the two support plates 5, and the collecting cylinder being located directly below the wide end of the finished wedge-shaped wood;

[0091] Preferably, the live cactus thorn 4 has a length of 5-15 mm, a bottom diameter of 0.5-1 mm, and a top tip diameter that gradually shrinks to 0.1-0.3 mm;

[0092] Preferably, the weight of the counterweight is 0.05-0.1g;

[0093] The device efficiently captures droplets in the air through the live cactus spines 4, and realizes rapid directional transport of droplets through the synergistic effect of the gradient wettability surface and the groove structure of the wooden wedge surface for directional water transmission. At the same time, as the droplets accumulate, the droplets drive the finished wedge-shaped wood and the rotating shaft 7 to flip toward the end of the collecting cylinder, so that the droplets fall into the collecting cylinder. After the droplets fall, the counterweight roller 6 drives the finished wedge-shaped wood to automatically reset, which can effectively ensure the continuous operation of the device. Compared with the existing mist collection device, the present invention not only improves the efficiency of droplet collection and liquid transportation, but also reduces the complexity and operating cost of the device.

[0094] The preparation method of the present invention is combined with the mist collection device, which not only makes full use of the natural graded structure and processability of wood, but also realizes the organic combination of surface function and geometric structure through the synergistic effect of gradient wettability and groove structure, greatly improving the water mist collection efficiency and liquid directional transport capacity, and provides new ideas for resource-saving and environmentally friendly liquid management technology, which is suitable for a wide range of fields such as water resource acquisition in arid areas and industrial condensate management.

[0095] Three different embodiments are provided in this application for simulation tests;

[0096] Embodiment 1: The length from the wide end to the tip of the wedge-shaped wood is 20 mm, the width of the wide end of the wedge-shaped wood is 3 mm, the thickness is 2 mm, and the wedge angle is set to 5°;

[0097] The hydrophobic agent and TiO2 nanoparticles (particle size 150 nm) were mixed in a mass ratio of 1:2;

[0098] The light shielding film 2 moves at a speed of 10 mm / h, exposing different areas of the sample surface to ultraviolet light, forming a gradient wettability surface with a contact angle ranging from 125° to 75°;

[0099] The weight roller 6 is 0.05g;

[0100] Embodiment 2: The length from the wide end to the tip of the wedge-shaped wood is 20 mm, the width of the wide end of the wedge-shaped wood is 5 mm, the thickness is 3 mm, and the wedge angle is set to 9°;

[0101] The hydrophobic agent and TiO2 nanoparticles (particle size 150 nm) were mixed in a mass ratio of 1:3;

[0102] The light shielding film 2 moves at a speed of 7 mm / h, exposing different areas of the sample surface to ultraviolet light, forming a gradient wettability surface with a contact angle ranging from 125° to 55°;

[0103] The weight roller 6 is 0.07g;

[0104] Embodiment 3: The length from the wide end to the tip of the wedge-shaped wood is 20 mm, the width of the wide end of the wedge-shaped wood is 5 mm, the thickness is 5 mm, and the wedge angle is set to 15°;

[0105] The hydrophobic agent and TiO2 nanoparticles (particle size 150 nm) were mixed in a mass ratio of 1:3;

[0106] The light shielding film 2 moves at a speed of 2 mm / h, exposing different areas of the sample surface to ultraviolet light, forming a gradient wettability surface with a contact angle ranging from 125° to 15°;

[0107] The weight roller 6 is 0.1g;

[0108] In the process of preparing the finished wedge-shaped wood of Embodiment 1, Embodiment 2 and Embodiment 3, except for the difference in the parameters described above, the other steps and parameters are the same;

[0109] The first, second and third embodiments are all at a fog density of 10 g / m 3 , the experiment was carried out in a simulated environment with an atomization rate of 200 mL / h;

[0110] The water collection efficiency of the mist collecting device in Example 1 reaches 2.5 mL / h·cm 2 ;

[0111] The water collection efficiency of the mist collecting device in Example 2 reaches 5.5 mL / h·cm 2 ;

[0112] The water collection efficiency of the mist collecting device in Example 3 reached 9.5 mL / h·cm 2 .

[0113] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0114] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preparing a wooden wedge-shaped surface for directional moisture transmission, characterized in that: The following steps are involved: Cutting the longitudinally sectioned timber into wedge-shaped timbers; The wedge-shaped wood is ultrasonically cleaned in deionized water, and after the cleaning is completed, the wedge-shaped wood is taken out and dried; The dried wedge-shaped wood is subjected to a delignification treatment; The delignified wedge-shaped wood is immersed in a modified resin solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying, so that grooves are formed on the surface of the wedge-shaped wood; The wedge-shaped wood with grooves formed on the surface is immersed in a hydrophobic modification solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying to obtain a super-hydrophobic wedge-shaped wood (3); The ultraviolet lamp (1) and the light shielding film (2) are used to irradiate the super-hydrophobic wedge-shaped wood (3), so that the surface of the wedge-shaped wood has gradient wettability, thereby obtaining a finished wedge-shaped wood with a wood wedge-shaped surface for directional moisture transmission.

2. The method for preparing a wooden wedge-shaped surface for directional moisture transmission according to claim 1, characterized in that: The dried wedge-shaped wood is subjected to a delignification treatment, which specifically comprises the following steps: The dried wedge-shaped wood was immersed in a 1wt% NaClO2 solution; The pH value of 1 wt% NaClO2 solution was adjusted to 4.6; Soak in 1wt% NaClO2 solution at 80℃ for 6 hours; After soaking, take out the wedges of wood and rinse them repeatedly with deionized water until they are neutral; The wedge-shaped wood is washed with anhydrous ethanol, and then freeze-dried to obtain delignified wedge-shaped wood.

3. The method for preparing a wooden wedge-shaped surface for directional moisture transmission according to claim 2, characterized in that: The delignified wedge-shaped wood is immersed in a modified resin solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying, so that grooves are formed on the surface of the wedge-shaped wood. Specifically, the following steps are included: Add 0.5-2 g of polyvinylidene fluoride-hexafluoropropylene to 50-100 mL of dimethylformamide, and stir until the polyvinylidene fluoride-hexafluoropropylene is completely dissolved to obtain a modified resin solution; The delignified wedge-shaped wood is immersed in the modified resin solution for 6-12 hours; After the impregnation is completed, take out the wedge-shaped wood and clean it with anhydrous ethanol; After cleaning, the wedge-shaped wood is dried to obtain the wedge-shaped wood with grooves on the surface.

4. The method for preparing a wooden wedge-shaped surface for directional moisture transmission according to claim 3, characterized in that: The wedge-shaped wood with grooves formed on the surface is immersed in a hydrophobic modification solution, and after the immersion is completed, the wedge-shaped wood is taken out for cleaning and drying to obtain a super-hydrophobic wedge-shaped wood (3), which specifically comprises the following steps: The hydrophobic agent is mixed with TiO2 nanoparticles and dissolved in an ethanol solution with a concentration of 10-40wt% to obtain a hydrophobic modified solution; The grooved wedge-shaped wood is immersed in the hydrophobic modification solution for 1-3 hours; After the impregnation is completed, take out the wedge-shaped wood and clean it with anhydrous ethanol; After cleaning, the wedge-shaped wood is dried to obtain a super-hydrophobic wedge-shaped wood (3).

5. The method for preparing a wooden wedge-shaped surface for directional moisture transmission according to claim 4, characterized in that: When the hydrophobic agent is mixed with TiO2 nanoparticles, the mass of the TiO2 nanoparticles is 2-4 times the mass of the hydrophobic agent.

6. The method for preparing a wooden wedge-shaped surface for directional moisture transmission according to claim 5, characterized in that: The hydrophobic agent is any one of 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane, vinyl triethoxysilane, hexadecyl trimethoxysilane, polydimethylsiloxane, and alkyl isocyanate.

7. The method for preparing a wooden wedge-shaped surface for directional moisture transmission according to claim 6, characterized in that: The particle size of TiO2 nanoparticles is 100-200nm.

8. The method for preparing a wooden wedge-shaped surface for directional moisture transmission according to claim 7, characterized in that: The ultraviolet lamp (1) and the light shielding film (2) are used to irradiate the super-hydrophobic wedge-shaped wood (3), so that the surface of the wedge-shaped wood has gradient wettability, thereby obtaining a finished wedge-shaped wood with a wood wedge-shaped surface for directional water transmission, which specifically comprises the following steps: The UV lamp (1) emits UV light with a wavelength of 365 nm and a light intensity of 0.35 W / m 2 ; Placing the super-hydrophobic wedge-shaped wood (3) horizontally under the ultraviolet lamp (1); A light shielding film (2) is placed between the super-hydrophobic wedge-shaped wood (3) and the ultraviolet lamp (1), and the light shielding film (2) completely covers the super-hydrophobic wedge-shaped wood (3); The ultraviolet lamp (1) is turned on to irradiate the light shielding film (2), and the light shielding film (2) is uniformly moved along the wide end of the super-hydrophobic wedge-shaped wood (3) toward the tip of the super-hydrophobic wedge-shaped wood (3), so that the surface of the wedge-shaped wood has gradient wettability, thereby obtaining a finished wedge-shaped wood with a wood wedge surface for directional moisture transmission.

9. A mist collecting device for a wooden wedge-shaped surface with directional moisture transmission, comprising a finished wedge-shaped wood prepared by a method for preparing a wooden wedge-shaped surface with directional moisture transmission, characterized in that: The invention also comprises a pair of symmetrically placed support plates (5), a horizontally placed rotating shaft (7) being rotatably connected between the two support plates (5), the finished wedge-shaped wood being fixed on the peripheral wall of the upper end of the rotating shaft (7), and the wide end to the tip of the finished wedge-shaped wood being placed perpendicular to the rotating shaft (7), the finished wedge-shaped wood being located between the two support plates (5), a counterweight roller (6) being placed coaxially with the rotating shaft (7) being fixed on the lower end surface of the finished wedge-shaped wood, the counterweight roller (6) being located on a side of the rotating shaft (7) close to the tip of the finished wedge-shaped wood, and the counterweight roller (6) being located on the upper end of the support plates (5), a vertically placed live cactus thorn (4) being fixed on the upper end surface of the tip of the finished wedge-shaped wood, and a collecting cylinder with an open upper end being provided on one side of the two support plates (5), and the collecting cylinder being located directly below the wide end of the finished wedge-shaped wood.

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