Super-hydrophobic switchable super-oleophobic composite self-cleaning coating
Patent Information
- Application Number
- CN202522623523.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-10
AI Technical Summary
[0004]本实用新型的目的在于提供一种超疏水转换超清水复合自清洁涂层，解决了背景技术中擦拭、风雨冲刷等会快速破坏微纳结构，导致疏水性能在短期内大幅下降，甚至完全消失的问题
1、本实用新型通过自清洁涂层机构的设置，能够提供初期的自清洁效果，当超疏水涂层局部脱落后，裸露部位为超清水涂层微区，仍能通过亲水性能保持清洁效果，以此实现对整体自洁效果的维持，避免后期局部污染出现，而且当超疏水涂层脱落时，并不需要立即重新补涂，底层的超亲水涂层仍能提供基础的防污效果，避免因局部失效导致整体维护成本上升，通过底层超亲水涂层的辅助自洁作用，保持墙体的清洁外观，避免出现局部斑驳污染的问题，提升涂层的实际应用效果与使用寿命，实施操作流程简单，适配实际工程中的维护场景。
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Figure CN224902473U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cleaning coating technology, specifically to a superhydrophobic-to-superwater-cleaning composite self-cleaning coating. Background Technology
[0002] In the process of urban construction, the cleaning and maintenance of building exteriors has always been a difficult problem for the industry. Rapid urbanization and industrialization have exposed exterior walls to harsh environments for a long time, resulting in serious aging and pollution problems. Pollutants such as industrial dust and vehicle exhaust easily adhere to the exterior wall surface, forming stains that are difficult to clean after being washed by rainwater.
[0003] However, traditional self-cleaning coatings are mainly divided into two categories: superhydrophobic and superhydrophilic. Superhydrophobic coatings achieve hydrophobicity by constructing micro-nano protrusions on the coating surface, similar to the nipples on the surface of a lotus leaf. However, these structures have extremely low hardness, usually below 2H. Everyday friction, such as wiping and rain, will quickly damage the micro-nano structure, causing the hydrophobic performance to drop significantly or even disappear completely in a short period of time. Superhydrophilic coatings construct special surface structures, such as hydroxylated surfaces, so that the contact angle of water on the coating surface is <10°, forming a uniform water film and carrying away pollutants. Their self-cleaning ability depends on the action of water flow and is relatively weak in cleaning ability compared to superhydrophobic coatings. They are also weak in cleaning oily pollutants such as oil stains and soot. Utility Model Content
[0004] The purpose of this invention is to provide a superhydrophobic-to-superwater-cleaning composite self-cleaning coating, which solves the problem in the prior art that wiping, wind and rain erosion, etc., can quickly damage the micro-nano structure, causing the hydrophobic properties to drop significantly or even disappear completely in a short period of time.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A superhydrophobic-converting superwater-cleaning composite self-cleaning coating includes: Wall substrate; The self-cleaning coating mechanism is located on one side of the wall substrate and is used for self-cleaning treatment of the exterior wall surface. The self-cleaning coating mechanism includes a superhydrophobic coating disposed on one side of the wall substrate. A cleaning component to assist the self-cleaning of the superhydrophobic coating is disposed on one side of the wall substrate. The wall substrate is a cement-based wall substrate, including cast-in-place concrete wall, fiber cement board, calcium silicate cement board, or UHPC wall panel. The hydroxyl treatment agent is selected from 3 parts by mass of γ-aminopropyltriethoxysilane and 97 parts by mass of ethylene glycol, which are mixed and coated on the surface of the wall substrate to allow the reagent to react with the substrate surface and graft hydroxyl groups.
[0006] Preferably, the cleaning component includes a superhydrophilic coating disposed on one side of the wall substrate. The superhydrophilic coating is located on the side of the superhydrophobic coating close to the wall substrate. An auxiliary component is disposed between the superhydrophilic coating and the superhydrophobic coating. The superhydrophilic coating is made of 25 parts by weight of hydroxyl acrylic resin, 15 parts by weight of nano silica, 55 parts by weight of ethylene glycol, 3 parts by weight of water-based isocyanate crosslinking agent, and 2 parts by weight of acrylate leveling agent. It is sprayed onto the surface of the wall substrate with a coating thickness of 40-60 μm.
[0007] Preferably, the auxiliary component includes a superhydrophobic coating microregion disposed between the superhydrophilic coating and the superhydrophobic coating, and a plurality of superhydrophilic coating microregions disposed on the superhydrophobic coating microregion.
[0008] Preferably, one side of the wall substrate is provided with a hydroxylated surface, and the superhydrophobic coating is made of 12 parts by weight of hexadecyltrimethoxysilane, 10 parts by weight of nano-silica pretreated with silane coupling agent, 75 parts by weight of ethanol, and 3 parts by weight of phosphate ester dispersant, and is sprayed onto the surface of the superhydrophobic coating with a coating thickness of 20-30 μm.
[0009] Preferably, the superhydrophilic coating is located on the side of the hydroxylated surface away from the wall substrate, and the hydroxylated surface is located between the wall substrate and the superhydrophilic coating.
[0010] Compared with the prior art, the beneficial effects achieved by this utility model are: 1. This utility model, through the setting of the self-cleaning coating mechanism, can provide an initial self-cleaning effect. When the superhydrophobic coating is partially peeled off, the exposed part is the micro-area of the superhydrophobic coating, which can still maintain the cleaning effect through its hydrophilic properties. This achieves the maintenance of the overall self-cleaning effect and avoids the occurrence of local pollution later. Moreover, when the superhydrophobic coating is peeled off, it is not necessary to recoat it immediately. The underlying superhydrophilic coating can still provide a basic anti-fouling effect, avoiding the increase in overall maintenance costs due to local failure. Through the auxiliary self-cleaning effect of the underlying superhydrophilic coating, the clean appearance of the wall is maintained, avoiding the problem of local mottled pollution, improving the actual application effect and service life of the coating. The implementation and operation process is simple and suitable for maintenance scenarios in actual engineering projects.
[0011] 2. This utility model, through the setting of superhydrophilic coating micro-regions and superhydrophobic coating micro-regions, when the superhydrophobic coating is partially peeled off, the surface exhibits a distribution of hydrophobic and hydrophilic micro-regions, making some areas hydrophobic and others hydrophilic. When water flows into the hydrophobic micro-regions, it will quickly slide into the hydrophilic micro-regions, increasing the water volume in the hydrophilic micro-regions and improving the self-cleaning effect of the micro-regions, thus having good economic efficiency and applicability. Attached Figure Description
[0012] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the partially failed surface of this utility model.
[0013] Among them: 1. Wall substrate; 2. Hydroxylated surface; 3. Superhydrophilic coating; 4. Superhydrophobic coating; 5. Superhydrophilic coating micro-region; 6. Superhydrophobic coating micro-region. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0015] Please refer to Figure 1 A superhydrophobic conversion super water-cleaning composite self-cleaning coating includes: a wall substrate 1.
[0016] Please refer to Figure 1 The self-cleaning coating mechanism is located on one side of the wall substrate 1 and is used for self-cleaning treatment of the exterior wall surface. The self-cleaning coating mechanism includes a superhydrophobic coating 4 disposed on one side of the wall substrate 1, and a cleaning component that assists the superhydrophobic coating 4 in self-cleaning is disposed on one side of the wall substrate 1. The cleaning component includes a superhydrophilic coating 3 disposed on one side of the wall substrate 1, the superhydrophilic coating 3 is located on the side of the superhydrophobic coating 4 close to the wall substrate 1, and an auxiliary component is disposed between the superhydrophilic coating 3 and the superhydrophobic coating 4. First, the wall substrate 1 is a fair-faced concrete exterior wall. Before implementation, the surface dust and contaminants are cleaned thoroughly. Then, a hydroxyl treatment agent is selected, consisting of 3 parts by weight of γ-aminopropyltriethoxysilane and 97 parts by weight of ethylene glycol. This mixture is applied to the surface of the wall substrate 1. After 24 hours, the next step is performed. Then, the super-hydrophilic coating 3 is made by mixing 25 parts by weight of hydroxyl acrylic resin, 15 parts by weight of nano-silica, 55 parts by weight of ethylene glycol, 3 parts by weight of water-based isocyanate crosslinking agent, and 2 parts by weight of acrylic leveling agent. This mixture is then sprayed onto the wall substrate. The coating thickness is 60 μm on the surface of material 1, and the curing time is not less than 48 hours after coating. After the coating is cured, the superhydrophobic coating 4 is made of 12 parts by mass of hexadecyltrimethoxysilane, 10 parts by mass of nano-silica pretreated with silane coupling agent, 75 parts by mass of ethanol, and 3 parts by mass of phosphate ester dispersant. It is sprayed onto the surface of the superhydrophilic coating 3 with a coating thickness of 30 μm. The curing time is not less than 48 hours after coating. Moreover, the above operations are carried out in a dry environment to avoid construction on rainy days.
[0017] Furthermore, such as Figure 2 As shown, the auxiliary components include a superhydrophobic coating microregion 6 disposed between the superhydrophobic coating 3 and the superhydrophobic coating 4, and a plurality of superhydrophobic coating microregions 5 disposed on the superhydrophobic coating microregion 6.
[0018] Furthermore, such as Figure 1 As shown, a hydroxylated surface 2 is provided on one side of the wall substrate 1, and a superhydrophilic coating 3 is located on the side of the hydroxylated surface 2 away from the wall substrate 1. The hydroxylated surface 2 is located between the wall substrate 1 and the superhydrophilic coating 3. Based on this, when the wall substrate 1 is a fiber cement decorative panel, the surface dust and contaminants are cleaned before implementation. Then, 3 parts by weight of γ-aminopropyltriethoxysilane and 97 parts by weight of ethylene glycol are selected as the hydroxyl treatment agent, mixed and brushed onto the surface of the fiber cement decorative panel. After 24 hours, the next step is carried out. Furthermore, the superhydrophilic coating 3 is made of 25 parts by weight of hydroxyl acrylic resin, 1 A mixture of 5 parts by weight of nano-silica, 55 parts by weight of ethylene glycol, 3 parts by weight of water-based isocyanate crosslinking agent, and 2 parts by weight of acrylate leveling agent is sprayed onto the surface of wall substrate 1 to a thickness of 40 μm. After coating, it is baked at 60°C for 5 hours. Further, a superhydrophobic coating 4 is made by spraying a mixture of 12 parts by weight of hexadecyltrimethoxysilane, 10 parts by weight of nano-silica pretreated with a silane coupling agent, 75 parts by weight of ethanol, and 3 parts by weight of phosphate ester dispersant onto the surface of superhydrophilic coating 3 to a thickness of 20 μm. After coating, it is baked at 60°C for 3 hours. Working principle: First, a hydroxyl treatment agent, consisting of 3 parts by weight of γ-aminopropyltriethoxysilane and 97 parts by weight of ethylene glycol, is applied to the surface of cement-based wall substrates such as cast-in-place concrete walls and fiber cement boards to form a hydroxylated surface 2 through reaction grafting. Then, a superhydrophilic coating 3, consisting of 25 parts by weight of hydroxyl acrylic resin and 15 parts by weight of nano-silica, is sprayed onto the hydroxylated surface 2 at a thickness of 40–60 μm. Next, a superhydrophobic coating 4, consisting of 12 parts by weight of hexadecyltrimethoxysilane and 10 parts by weight of nano-silica pretreated with a silane coupling agent, is sprayed onto the surface at a thickness of 20–30 μm. A layer of m thickness is sprayed onto the surface of the superhydrophilic coating 3. Initially, the superhydrophobic coating 4 provides a self-cleaning effect. When the superhydrophobic coating 4 partially peels off, a state of coexistence of superhydrophilic coating micro-regions 5 and superhydrophobic coating micro-regions 6 is formed on the surface. When water flows into the superhydrophobic coating micro-regions 6, it will quickly slide down to the superhydrophilic coating micro-regions 5, increasing the water volume in that area and enhancing the self-cleaning effect of the micro-regions. Throughout the entire transition stage from partial peeling to complete failure of the superhydrophobic coating 4, the underlying superhydrophilic coating 3 continues to play an auxiliary self-cleaning role, maintaining the clean appearance of the wall, avoiding localized mottled pollution, and thus improving the actual application effect and service life of the composite coating.
[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A superhydrophobic-to-superwater-cleaning composite self-cleaning coating, characterized in that, include: Wall substrate (1); The self-cleaning coating mechanism is located on one side of the wall substrate (1) and is used for self-cleaning treatment of the exterior wall surface. The self-cleaning coating mechanism includes a superhydrophobic coating (4) disposed on one side of the wall substrate (1), and a cleaning component that assists the superhydrophobic coating (4) in self-cleaning is disposed on one side of the wall substrate (1).
2. The superhydrophobic-to-superwater-cleaning composite self-cleaning coating according to claim 1, characterized in that: The cleaning component includes a superhydrophilic coating (3) disposed on one side of the wall substrate (1), the superhydrophilic coating (3) being located on the side of the superhydrophobic coating (4) close to the wall substrate (1), and an auxiliary component being disposed between the superhydrophilic coating (3) and the superhydrophobic coating (4).
3. The superhydrophobic-to-superwater-cleaning composite self-cleaning coating according to claim 2, characterized in that: The auxiliary components include a superhydrophobic coating microregion (6) disposed between the superhydrophobic coating (3) and the superhydrophobic coating (4) and a plurality of superhydrophobic coating microregions (5) disposed on the superhydrophobic coating microregion (6).
4. The superhydrophobic-to-superwater-cleaning composite self-cleaning coating according to claim 3, characterized in that: The wall substrate (1) has a hydroxylated surface (2) on one side.
5. The superhydrophobic-to-superwater-cleaning composite self-cleaning coating according to claim 4, characterized in that: The superhydrophilic coating (3) is located on the side of the hydroxylated surface (2) away from the wall substrate (1), and the hydroxylated surface (2) is located between the wall substrate (1) and the superhydrophilic coating (3).