Fluorine-free hydrophobic agent, preparation method and application thereof
The preparation of hydrophobic coatings by photoclick reaction of thiols-olefins with fluorine-free hydrophobic agents solves the problems of complex preparation process and insufficient durability in the existing technology, and realizes the preparation and application of hydrophobic materials in a simple, fast and green manner.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HANGZHOU NORMAL UNIVERSITY
- Filing Date
- 2025-09-15
- Publication Date
- 2026-06-12
AI Technical Summary
Existing technologies for preparing hydrophobic materials suffer from problems such as complex preparation processes, long preparation times, lack of environmental friendliness, and insufficient physical durability.
A fluorine-free hydrophobic agent was prepared by reacting tetramethyldivinyldisilazane with aliphatic long-chain thiols via a photoinitiator and an organic solvent to produce a low surface energy hydrophobic agent. This agent was then applied to the substrate surface by dipping or spraying to form a chemically bonded hydrophobic coating.
It enables the simple, rapid, and environmentally friendly preparation of hydrophobic materials. The coating has excellent hydrophobicity and durability, and can remain stable under physical damage. It is suitable for waterproofing, self-cleaning, and oil-water separation applications.
Smart Images
Figure CN120944111B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of surface modification technology, and particularly relates to a fluorine-free hydrophobic agent, its preparation method and application. Background Technology
[0002] The wettability of a material surface is a crucial material property, closely related to numerous physicochemical processes such as adsorption, lubrication, and adhesion. The indicator for measuring the wettability of a material surface is called the contact angle; a surface can be called a hydrophobic surface when the contact angle of a water droplet on its surface is greater than 90°. The unique wettability of hydrophobic surfaces makes them valuable in applications such as self-cleaning, metal corrosion protection, anti-icing, and oil-water separation. With the rapid development of technologies in various fields, hydrophobic materials have become a strategic industry related to human life, encompassing clothing, food, housing, and transportation.
[0003] In nature, the surfaces of organisms such as rice leaves, geckos, water striders, and fish scales have been found to exhibit extremely strong hydrophobic properties. Although this superhydrophobic phenomenon was discovered long ago, researchers did not begin to systematically study its surface microstructure and chemical composition until the late 20th century. In 1997, Barthlott and Neihuis first attributed this self-cleaning property to the synergistic effect of microscopic roughness and low surface energy, proposing the concept of the "lotus effect." Depending on whether the microscopic roughness and low surface energy material used form strong chemical bonds with the material surface, preparation methods are mainly divided into physical and chemical methods. Currently, research on the physical method for preparing hydrophobic materials mainly focuses on the influence of surface roughness on the hydrophobic properties, with the most representative work focusing on the hydrophobic effect of multi-scale structures. For example, Li et al. constructed a hydrophobic coating on the substrate surface using dual-sized manganese dioxide particles and polydimethylsiloxane (PDMS) as a binder (Journal of Materials Chemistry C, 2023, 11(44): 15443-15453.); Zhao et al. prepared a hydrophobic coating on a glass substrate using zinc oxide particles and epoxy resin (Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2022, 651, 129714); Gong et al. prepared an erasable hydrophobic coating using silica particles, polyvinyl alcohol, and PDMS (Materials & Design, 2020, 196, 109112.). These methods can give the substrate excellent hydrophobicity, but most of them have poor physical durability due to insufficient adhesion to the substrate. In addition, there are methods to chemically modify the substrate to impart hydrophobicity. For example, Liu et al. prepared a hydrophobic coating on the polyurethane surface by dopamine self-polymerization and reaction with hexamethyldisilazane (Separation and Purification Technology, 2019, 229, 115801.); Zhou et al. prepared hydrophobic materials by reacting dodecafluoroheptyl methacrylate and isocyanate ethyl methacrylate with hydroxyl groups on the substrate surface (Polymers, 2023, 15(11), 2505); Shen et al. prepared a hydrophobic material with excellent corrosion resistance by reacting silane coupling agent, silica and amino carbon nanotubes and bonding the product to the substrate with epoxy resin (Progress in Organic Coatings, 2023, 181, 107602). The hydrophobic surfaces prepared by these methods have excellent hydrophobic and self-cleaning abilities, and due to the chemical bonding between the coating and the substrate, they achieve excellent physicochemical durability, solving the problem of insufficient mechanical durability of physical methods.However, most of these chemical methods have problems such as multiple preparation processes, long time consumption, complex processes, or being environmentally unfriendly.
[0004] Therefore, how to provide a simple, fast, and green method to prepare robust and durable hydrophobic materials is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0005] To address the aforementioned technical problems, this invention proposes a fluorine-free hydrophobic agent, its preparation method, and its application.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A fluorine-free hydrophobic agent comprising the following raw materials in parts by weight:
[0008] 20-40 parts tetramethyldivinyldisilazane, 24-80 parts aliphatic long-chain thiols, 0.2-1 parts photoinitiator and 100 parts organic solvent.
[0009] Preferably, the aliphatic long-chain thiols include one or more of n-octadecyl thiols, n-dodecyl thiols, n-decyl thiols, n-octyl thiols, n-hexadecyl thiols, and n-heptyl thiols.
[0010] Preferably, the photoinitiator includes one or more of 2-hydroxy-2-methylphenylacetone, 1-hydroxycyclohexylbenzophenone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone, and diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide.
[0011] Preferably, the organic solvent includes one or more of dichloromethane, ethyl acetate, tetrahydrofuran, toluene, and hexane.
[0012] Beneficial Effects: The thiols used in this invention are mainly aliphatic long-chain thiols with the mercapto group located on the first carbon atom; tetramethyldivinyldisilazane is a silazane containing an olefin bond. On the one hand, long-chain aliphatic groups are grafted onto the substrate through a thiol-olefin photoclick reaction; on the other hand, the silicon-nitrogen bond acts on the hydroxyl groups on the substrate surface, chemically grafting low surface energy long-chain aliphatic groups onto the substrate surface, endowing the substrate with durable and stable hydrophobic properties; the organic solvent can dissolve the thiols and tetramethyldivinyldisilazane to form a solution, ensuring thorough mixing of the components and a more complete reaction; the photoinitiator is used to initiate the thiol-olefin photoclick reaction between tetramethyldivinyldisilazane and the thiols, ensuring the normal progress of the reaction. Finally, the fluorine-free hydrophobic agent obtained by this invention can be applied to different substrate surfaces through simple wetting or spraying methods, giving the substrate excellent hydrophobicity, with a water contact angle reaching 130°-155°. Simultaneously, the resulting hydrophobic coating maintains structural stability and possesses durable and stable hydrophobic properties, making it suitable for applications in waterproofing, self-cleaning, oil-water separation, and corrosion resistance.
[0013] A method for preparing a fluorine-free hydrophobic agent includes the following steps:
[0014] Aliphatic long-chain thiols, tetramethyldivinyldisilazane, photoinitiator and organic solvent are mixed and stirred under ultraviolet light for 0.5-1 h to obtain the fluorine-free hydrophobic agent.
[0015] Preferably, the wavelength of the ultraviolet light is 365nm.
[0016] Beneficial effects: This invention mainly involves the thiol-ene photoclick reaction of tetramethyldivinyldisilazane and thiol under the combined action of organic solvent, photoinitiator and ultraviolet light, to graft tetramethyldivinyldisilazane onto aliphatic long carbon chains, thereby obtaining a low surface energy fluorine-free hydrophobic agent.
[0017] Application of a fluorine-free hydrophobic agent in regulating the wettability of material surfaces.
[0018] Preferably, the surface of the material is rich in hydroxyl groups or not rich in hydroxyl groups;
[0019] The material that is not rich in hydroxyl groups is treated in a saturated sodium hydroxide solution for 0.5-1 hour before use.
[0020] Preferably, the material includes one or more of the following: fabric, sponge, wood, paper, metal, and plastic.
[0021] Beneficial effects: When the fluorine-free hydrophobic agent obtained by this invention is applied to the surface of a substrate rich in hydroxyl groups, the silicon-nitrogen bonds in the hydrophobic agent molecule are broken under the action of the hydroxyl groups on the substrate surface and form new bonds with the substrate, thereby chemically grafting the long carbon chain hydrophobic agent onto the substrate surface and endowing the substrate surface with durable and stable hydrophobic properties.
[0022] Compared with the prior art, the present invention has the following advantages and technical effects:
[0023] The method for preparing the fluorine-free hydrophobic agent provided by this invention is simple, rapid, and efficient, requiring only a single photoclick reaction. The preparation process is short, fluorine-free, environmentally friendly, and easy to produce. Secondly, the fluorine-free hydrophobic agent provided by this invention chemically modifies the substrate surface through impregnation and spraying. The silicon-nitrogen bonds in the hydrophobic agent molecules break with the hydroxyl groups on the material surface to form new bonds, thus imparting hydrophobicity to the substrate surface. Compared with existing chemical modification methods for substrates, the modification process is simple, the conditions are mild, the reaction speed is fast, and it is easy to quickly modify the surface for hydrophobicity. Furthermore, the hydrophobic material prepared using the fluorine-free hydrophobic agent provided by this invention exhibits chemical bonding between the hydrophobic groups on its surface and the substrate. When subjected to physical damage such as peeling or friction, the hydrophobic coating maintains structural stability and is not easily detached, thus endowing the material with durable and stable hydrophobic properties. Attached Figure Description
[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:
[0025] Figure 1 The hydrophobic cotton fabric prepared in Example 1 exhibits (a) hydrophobic effect, (b) "silver mirror" phenomenon, (c) self-cleaning effect, and (d) water contact angle.
[0026] Figure 2 FTIR spectra of tetramethyldivinyldisilazane, n-octadecyl mercaptan, and the fluorine-free hydrophobic agent prepared in Example 1;
[0027] Figure 3 The water contact angle of the hydrophobic cotton fabric prepared in Example 1 after soaking in different solvents for 32 hours;
[0028] Figure 4 (a) Friction test process and (b) Water contact angle of the hydrophobic cotton fabric prepared in Example 1;
[0029] Figure 5 The droplet wetting states of tea, milk, coffee, and copper sulfate-stained deionized water in Example 2 are shown in (a) the original melamine sponge and (b) the hydrophobic melamine sponge, and (c) the water contact angle of the hydrophobic melamine sponge.
[0030] Figure 6 (a) Hydrophobic effect and (b) water contact angle of the hydrophobic wooden block obtained in Example 3;
[0031] Figure 7 The hydrophobic effect and water contact angle of the hydrophobic paper obtained in Example 4 are shown in (a) and (b) respectively.
[0032] Figure 8 (a) Hydrophobic effect and (b) water contact angle of the hydrophobic polyurethane sponge obtained in Example 5;
[0033] Figure 9 The hydrophobic effect of the hydrophobic cotton fabric obtained in Comparative Example 1;
[0034] Figure 10 The hydrophobic effect of the hydrophobic cotton fabric obtained in Comparative Example 2 is shown. Detailed Implementation
[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0037] This invention provides a fluorine-free hydrophobic agent comprising the following raw materials in parts by weight:
[0038] 20-40 parts tetramethyldivinyldisilazane, 24-80 parts aliphatic long-chain thiols, 0.2-1 parts photoinitiator and 100 parts organic solvent.
[0039] In a preferred embodiment, the aliphatic long-chain thiols include one or more of n-octadecyl thiols, n-dodecyl thiols, n-decyl thiols, n-octyl thiols, n-hexadecyl thiols, and n-heptyl thiols.
[0040] In a preferred embodiment, the photoinitiator includes one or more of 2-hydroxy-2-methylphenylacetone, 1-hydroxycyclohexylbenzophenone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone, and diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide.
[0041] In a preferred embodiment, the organic solvent includes one or more of dichloromethane, ethyl acetate, tetrahydrofuran, toluene, and hexane.
[0042] This invention also provides a method for preparing a fluorine-free hydrophobic agent, comprising the following steps:
[0043] Aliphatic long-chain thiols, tetramethyldivinyldisilazane, photoinitiator and organic solvent are mixed and stirred under ultraviolet light for 0.5-1 h to obtain the fluorine-free hydrophobic agent.
[0044] In a preferred embodiment, the wavelength of the ultraviolet light is 365 nm.
[0045] This invention also provides an application of a fluorine-free hydrophobic agent in regulating the wettability of material surfaces.
[0046] In a preferred embodiment, the surface of the material may be rich in hydroxyl groups or not rich in hydroxyl groups;
[0047] The material that is not rich in hydroxyl groups is treated in a saturated sodium hydroxide solution for 0.5-1 hour before use.
[0048] In a preferred embodiment, the material includes one or more of fabrics, sponges, wood, paper, metals, and plastics.
[0049] Unless otherwise specified, all raw materials used in the embodiments of this invention were purchased through commercial channels.
[0050] Unless otherwise specified, room temperature or normal temperature in the embodiments of the present invention refers to 25±3℃.
[0051] Example 1
[0052] A method for preparing a fluorine-free hydrophobic agent includes the following steps:
[0053] 20 parts of tetramethyldivinyldisilazane and 40 parts of n-octadecyl mercaptan were added to 100 parts of dichloromethane, and 0.2 parts of 2-hydroxy-2-methylphenylacetone were added dropwise. After thorough mixing, the mixture was stirred at room temperature under 365 nm ultraviolet light for 1 h to obtain a fluorine-free hydrophobic agent.
[0054] The application of a fluorine-free hydrophobic agent includes the following steps:
[0055] The cotton fabric was immersed in the fluorine-free hydrophobic agent described in this embodiment for 2 hours at room temperature, and then washed to obtain the hydrophobic cotton fabric.
[0056] The water contact angle of the prepared hydrophobic cotton fabric was measured as follows: Figure 1 As shown in section (d), the result is 154°. Figure 1 As shown in section (a), various droplets exhibit excellent hydrophobicity on the fabric surface, while oil droplets completely penetrate the fabric. For example... Figure 1 As shown in section (b), when a hydrophobic cotton fabric is placed in water, it will float on the surface, and when submerged, it will exhibit a "silver mirror" effect. Furthermore, as... Figure 1 As shown in section (c), when the hydrophobic cotton fabric is contaminated with dust, the water droplets can carry away the contaminants on the fabric surface under the impact of water droplets, thus cleaning the fabric and making it suitable for self-cleaning of the fabric surface.
[0057] FTIR was used to analyze tetramethyldivinyldisilazane, n-octadecyl mercaptan, and a fluorine-free hydrophobic agent. The results are as follows: Figure 2 As shown, it can be seen that n-octadecyl mercaptan at 2848 cm⁻¹ -1 The absorption peak at that point corresponds to CH on the long carbon chain. x The CH bond stretching vibration of tetramethyldivinyldisilazane at 1595 cm⁻¹ -1 The absorption peak at 1250 cm⁻¹ corresponds to the stretching vibration of C=C. -1 The absorption peak at 1175 cm⁻¹ corresponds to the bending vibration of Si-CH₃. -1 The absorption peak at 925 cm⁻¹ corresponds to the NH bond. -1 The absorption peak at that point corresponds to the Si-N bond. As can be seen from the figure, the absorption peak of the C=C bond in the fluorine-free hydrophobic agent disappears, indicating that the reaction proceeded successfully.
[0058] In addition, the chemical stability of the hydrophobic cotton fabric obtained in this embodiment was evaluated, mainly through immersion in different solvents and sandpaper friction. After immersion in n-hexane, dichloromethane, ethyl acetate, toluene, and N,N-dimethylformamide for 32 hours and then drying, the hydrophobic cotton fabric still maintained its superhydrophobic properties. Figure 3 As shown.
[0059] The hydrophobic cotton fabric obtained in this embodiment was subjected to a friction test using sandpaper. The experimental procedure is as follows: Figure 4 As shown in section (a), after 100 friction experiments, the water contact angle of the cotton fabric was tested every 10 friction experiments, and the results are as follows. Figure 4 As shown in section (b), the results show that the material maintains stable hydrophobic properties after the friction experiment.
[0060] Example 2
[0061] A method for preparing a fluorine-free hydrophobic agent includes the following steps:
[0062] 30 parts of tetramethyldivinyldisilazane and 45 parts of n-dodecyl mercaptan were added to 100 parts of dichloromethane, and 0.5 parts of 1-hydroxycyclohexylbenzophenone were added dropwise. After thorough mixing, the mixture was stirred at room temperature under 365 nm ultraviolet light for 0.5 h to obtain a fluorine-free hydrophobic agent.
[0063] The application of a fluorine-free hydrophobic agent includes the following steps:
[0064] The melamine sponge was immersed in the fluorine-free hydrophobic agent described in this embodiment for 2 hours at room temperature, and then washed to obtain the hydrophobic melamine sponge.
[0065] The contact angle and wettability with common liquids of the hydrophobic melamine sponge obtained in this embodiment and the original melamine sponge were tested, and the results are as follows: Figure 5 As shown. Figure 5 Part (a) shows the droplet wetting state of the original melamine sponge. It can be seen that tea, milk, coffee and copper sulfate-stained deionized water all show a hydrophilic state on its surface. Figure 5 Part (b) shows the droplet wetting state of the hydrophobic melamine sponge prepared in this embodiment. It can be seen that it exhibits hydrophobic properties towards tea, milk, coffee, and deionized water stained with copper sulfate. Furthermore, according to... Figure 5 As can be seen from section (c), the static water contact angle of the hydrophobic melamine sponge obtained in this embodiment reaches 141°.
[0066] Example 3
[0067] A method for preparing a fluorine-free hydrophobic agent includes the following steps:
[0068] 40 parts of tetramethyldivinyldisilazane and 48 parts of n-decyl mercaptan were added to 100 parts of n-hexane, and 1 part of 2-hydroxy-2-methylphenylacetone was added dropwise. After thorough mixing, the mixture was stirred at room temperature under 365 nm ultraviolet light for 1 h to obtain a fluorine-free hydrophobic agent.
[0069] The application of a fluorine-free hydrophobic agent includes the following steps:
[0070] Soak the wood blocks in a fluorine-free hydrophobic agent at room temperature for 2 hours, then wash them to obtain hydrophobic wood blocks.
[0071] The wetting state of water droplets on the surface of the hydrophobic wooden block obtained in this embodiment was observed, and a water contact angle test was performed. The results are as follows: Figure 6 In parts (a) and (b), it can be seen that the water droplets on the hydrophobic wooden board are in a nearly spherical state with a water contact angle of 138°, indicating that the wooden board surface has good hydrophobic properties after being modified with a fluorine-free hydrophobic agent.
[0072] Example 4
[0073] A method for preparing a fluorine-free hydrophobic agent includes the following steps:
[0074] 25 parts of tetramethyldivinyldisilazane and 50 parts of n-hexadecyl mercaptan were added to 100 parts of ethyl acetate, and 0.5 parts of diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide were added dropwise. After thorough mixing, the mixture was stirred at room temperature for 1 hour under 365 nm ultraviolet light to obtain a fluorine-free hydrophobic agent.
[0075] The application of a fluorine-free hydrophobic agent includes the following steps:
[0076] The wood pulp paper is soaked in a fluorine-free hydrophobic agent at room temperature for 2 hours, then washed to obtain hydrophobic wood pulp paper.
[0077] The hydrophobic effect of the prepared hydrophobic paper was tested, and the results are as follows: Figure 7 As shown in section (a), the contact angle of the droplet on the hydrophobic paper surface remained unchanged over 30 minutes, indicating its durable hydrophobicity. The water contact angle of the hydrophobic paper is as follows: Figure 7 As shown in section (b), the angle can reach 132°, indicating excellent hydrophobicity.
[0078] Example 5
[0079] A method for preparing a fluorine-free hydrophobic agent includes the following steps:
[0080] 28 parts of tetramethyldivinyldisilazane and 55 parts of n-hexadecyl mercaptan were added to 100 parts of dichloromethane, and 0.5 parts of 2-hydroxy-2-methylphenylacetone were added dropwise. After thorough mixing, the mixture was stirred at room temperature for 1 hour under 365 nm ultraviolet light to obtain a fluorine-free hydrophobic agent.
[0081] The application of a fluorine-free hydrophobic agent includes the following steps:
[0082] The polyurethane sponge is immersed in a fluorine-free hydrophobic agent at room temperature for 2 hours, and then washed to obtain the hydrophobic polyurethane sponge.
[0083] The hydrophobic effect of the prepared hydrophobic polyurethane sponge was tested, and the results are as follows: Figure 8 As shown in section (a), the contact angle of the droplet on the surface of the hydrophobic polyurethane sponge remained unchanged over 30 minutes, indicating its durable hydrophobicity. The water contact angle of the hydrophobic polyurethane sponge is shown below. Figure 8 As shown in section (b), the angle can reach 109°, indicating excellent hydrophobicity.
[0084] Comparative Example 1
[0085] The only difference from Example 1 is that the photoinitiator 2-hydroxy-2-methylphenylacetone is not included; all other raw materials, process steps, and parameters are the same as in Example 1. The corresponding experimental results are as follows: Figure 9 .Depend on Figure 9 It can be seen that the water droplets on the surface of the hydrophobic cotton fabric prepared in Comparative Example 1 are hemispherical and hydrophilic. Moreover, the water droplets begin to penetrate into the fabric after only 0.5 seconds, and the hydrophobic effect is generally poor.
[0086] Comparative Example 2
[0087] The only difference from Example 1 is that the aliphatic long-chain thiols are replaced with an equal amount of ethanethiol; all other raw materials, process steps, and parameters are the same as in Example 1. The corresponding experimental results are as follows: Figure 10 .Depend on Figure 10 It can be seen that the water droplets on the surface of the hydrophobic cotton fabric prepared in Comparative Example 2 are hemispherical and hydrophilic. Moreover, the water droplets begin to penetrate into the fabric after only 1 second, and the hydrophobic effect is generally poor.
[0088] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A fluorine-free hydrophobing agent, characterized by comprising: The ingredients include the following parts by weight: 20-40 parts tetramethyldivinyldisilazane, 24-80 parts aliphatic long-chain thiols, 0.2-1 parts photoinitiator and 100 parts organic solvent; The aliphatic long-chain thiols include one of n-dodecyl mercaptan, n-decyl mercaptan, and n-hexadecyl mercaptan; The photoinitiator includes 1-hydroxycyclohexylbenzophenone or diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide; The preparation method of the fluorine-free hydrophobic agent includes the following steps: Aliphatic long-chain thiols, tetramethyldivinyldisilazane, photoinitiator and organic solvent are mixed and stirred under ultraviolet light for 0.5-1 h to obtain the fluorine-free hydrophobic agent.
2. The fluorine-free hydrophobing agent according to claim 1, characterized by, The organic solvent includes one or more of dichloromethane, ethyl acetate, tetrahydrofuran, toluene, and hexane.
3. The method for preparing a fluorine-free hydrophobic agent as described in claim 1 or 2, characterized in that, Includes the following steps: Aliphatic long-chain thiols, tetramethyldivinyldisilazane, photoinitiator and organic solvent are mixed and stirred under ultraviolet light for 0.5-1 h to obtain the fluorine-free hydrophobic agent.
4. The method for preparing a fluorine-free hydrophobic agent according to claim 3, characterized in that, The wavelength of the ultraviolet light is 365nm.
5. The application of a fluorine-free hydrophobic agent as described in claim 1 or 2 in regulating the wettability of material surfaces; The materials include one or more of the following: fabric, sponge, wood, paper, metal, and plastic; The application includes the following steps: The material is immersed in the fluorine-free hydrophobic agent, and then washed after immersion to complete the adjustment of the material surface wettability.
6. The application according to claim 5, characterized in that, The surface of the material may be rich in hydroxyl groups or not rich in hydroxyl groups; The material that is not rich in hydroxyl groups is treated in a saturated sodium hydroxide solution for 0.5-1 hour before use.