Construction method of micro-cement antibacterial hydrophobic coating

Abstract

The invention relates to the technical field of building construction, in particular to a construction method of a micro-cement antibacterial hydrophobic coating. A construction method of a micro-cement antibacterial hydrophobic coating comprises the following steps: with fluorosilicone modified micro-cement as a raw material, respectively preparing a base coating and a functional coating, adding a silane coupling agent into the base coating, after the base coating is coated on a wall and cured to form the base coating, carrying out plasma activation treatment on the base coating, and then carrying out spray drying on the base coating to obtain the micro-cement antibacterial hydrophobic coating. Coating the base layer coating with an antibacterial coating of a mixed oil super-amphiphobic agent to form a functional coating, and finally performing functional detection and aesthetic acceptance of the coating. The coupling agent is used for conveniently realizing tight combination of the base layer coating and the functional coating, and the specific surface area is increased by using plasma activation treatment, so that the problem of relatively poor adhesive force between the hydrophobic coating and the micro-cement base layer due to additional spraying of the hydrophobic layer after the micro-cement base layer is brushed in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for constructing a microcement antibacterial and hydrophobic coating. Background Technology

[0002] Microcement is a novel decorative coating composed of cement, resin, mineral fillers, and additives. It features high strength, wear resistance, waterproofing, slip resistance, and seamlessness. However, traditional microcement decorative surfaces suffer from high porosity, susceptibility to water seepage and contamination, and bacterial growth during application. Therefore, a hydrophobic coating is often added to microcement coatings. However, current technologies often involve spraying a hydrophobic coating or other functional layer after the microcement base layer has been applied. This results in poor adhesion between the hydrophobic coating and the microcement base layer, easy loss of antibacterial agents in the hydrophobic coating, and insufficient durability. Summary of the Invention

[0003] In view of this, the present invention provides a microcement coating construction method to solve the problem in the prior art that the adhesion between the hydrophobic coating and the microcement substrate is poor due to the additional spraying of a hydrophobic layer after the microcement substrate is coated.

[0004] A method for constructing a microcement antibacterial and hydrophobic coating involves using fluorosilicone modified microcement as raw material to prepare a base coating and a functional coating. A silane coupling agent is added to the base coating. After the base coating is applied to the wall and cured to form a base coating, the base coating is subjected to plasma activation treatment. Then, an antibacterial coating of mixed oil and super hydrophobic agent is applied to the base coating to form a functional coating. Finally, the functional performance of the coating is tested and aesthetically accepted.

[0005] Furthermore, during the application of the base coat, texture is created by using a scraper to modify the base coat into the desired shape.

[0006] Furthermore, during the application of the base coating, decorative materials are simultaneously incorporated, including at least one of ceramic microspheres, fluorescent powder, or mixed natural mineral pigments.

[0007] Furthermore, before applying the base coat, the concrete surface is ground to Sa2.5 cleanliness using a dust-free grinder to remove oil stains and dust, while repairing the joints of the plasterboard.

[0008] Furthermore, when repairing the joints of gypsum board, a V-shaped groove is made at the joint, with a groove depth of not less than 3mm, and epoxy resin repair adhesive is injected.

[0009] Furthermore, the plasma activation treatment involves using 300W power to perform a 90-second plasma activation treatment on the cured base coating under a specific atmospheric environment.

[0010] Furthermore, after the functional coating is applied, a thermochromic sealant is sprayed onto the surface of the functional coating using 3D-printed vertices.

[0011] Furthermore, the functional testing includes testing hydrophobicity using a contact angle meter and simulating a beverage spill experiment.

[0012] Furthermore, the aesthetic acceptance includes scanning the coating using a multispectral imager and comparing it with the colors in the design draft to calculate the color difference.

[0013] The beneficial effects of the microcement antibacterial and hydrophobic coating construction method in this invention are as follows: By adding fluorosilicone modified microcement to both the base coating and the functional coating, the two are easily compatible and have a high degree of matching in terms of similar coefficients of thermal expansion and elastic modulus during subsequent use, thus avoiding delamination caused by differences in internal stress due to changes in ambient temperature and humidity; the addition of a silane coupling agent facilitates a chemical reaction between one end of the coupling agent molecule (such as methoxy group) and the microcement hydration product (such as Ca(OH)2), forming a strong Si-O-Ca covalent bond; the other end (such as methacryloyloxy group) provides a highly reactive organic interface for the subsequent functional layer; the use of plasma activation treatment after the base coating is cured can effectively remove the weak interface layer on the surface, while etching to form a nanoscale rough structure, which greatly increases the specific surface area of ​​the substrate. This provides a channel for the penetration of functional slurry, which forms a strong "locking" mechanical interlocking effect after curing; that is, through the above-mentioned multiple methods, a more stable connection is formed between the base coating and the functional coating; finally, functional testing and aesthetic acceptance are used to conveniently test whether the wall surface meets the requirements after construction, thereby solving the problem of poor adhesion between the hydrophobic coating and the microcement base layer caused by the additional spraying of a hydrophobic layer after the microcement base layer is coated in the existing technology. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below through specific embodiments. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0015] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0016] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0017] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0018] To better understand the technical solution of the present invention, the present invention will be described in detail below.

[0019] In Example 1 of the microcement antibacterial hydrophobic coating construction method (hereinafter referred to as the construction method) of the present invention:

[0020] In this embodiment, the construction method involves adding a silane coupling agent to the base coating to achieve a stable connection between the two supports through chemical bonds. At the same time, plasma activation treatment is used to increase the specific surface area of ​​the base coating, thereby improving the adhesion between the two coatings.

[0021] Specifically, before applying the base coat, the wall surface must first be treated. This includes both mechanical and chemical cleaning, with mechanical cleaning physically treating the wall and smoothing the surface. In this embodiment, a dust-free grinder equipped with a 120-grit diamond grinding wheel is used to grind the concrete base surface of the wall to a cleanliness level of Sa2.5. Care is taken to remove oil stains and loose dust during grinding, and to remove loose layers and thin plaster layers from the wall surface to prevent the coating from peeling off later. For the joints of the plasterboard on the wall, V-grooving is used, with a groove depth of at least 3mm. Epoxy resin repair adhesive is injected into the groove for repair, and the repaired surface is then sanded to ensure a smooth finish. Afterwards, chemical treatment is carried out. Specifically, in this embodiment, an alkaline cleaning agent with pH=9.5 (containing 0.5% nonionic surfactant) is first sprayed, and after standing for 10 minutes, it is rinsed with a high-pressure water gun with a pressure ≥15MPa. The above methods remove oil stains on the wall surface and provide a neutral environment to prevent the coating from peeling off later.

[0022] Of course, the final effect of the coating depends on the wall surface. The wall does not need to be absolutely smooth. If a rough texture is required, such as simulating a volcanic rock surface, the treated wall surface can be sandblasted to create a rough base. For different exhibition areas, the wall surface can be further processed, such as laying a layer of glass particles with a particle size of 2-3mm on the wall surface to achieve a shimmering "sustainable city" visual effect; or embedding conductive circuits in the wall surface to provide a circuit foundation for future interactive touch functions; or imprinting a natural hemp fiber mesh on the wall surface to simulate the natural texture of soil fibers.

[0023] Next, the base coat is sprayed. First, the materials are proportioned, using 100 parts of fluorosilicone modified microcement, 8 parts of silica fume, 0.05 wt% carbon fiber, and a silane coupling agent, mixed and stirred to a base material with a viscosity of 3500 ± 200 cP. By adding carbon fiber, the resistivity of the substrate is maintained at 10... 4 -10 6 Ω can be subsequently integrated with a capacitive touch interaction module. Of course, in other embodiments, the ratio used can be fine-tuned. Next, a base coat needs to be applied to the wall using a notched trowel, ensuring the thickness of the base coat remains within 1.2±0.2mm, balancing economy and durability. Of course, for different venues, since their characteristics differ, different processes may be used when applying the base coat to achieve different appearances. For example, ceramic microspheres with a diameter of 0.3-0.5mm can be added to the base coat and applied using a sponge patting method to create a "star-like" effect; or rare earth fluorescent powder can be added to the base coat, applied using an airless spraying process, and cured with UV; or natural mineral pigments can be added to the base coat, using a biomimetic scraper to create a bark-like texture. It is worth noting that in this embodiment, ceramic microspheres, fluorescent powder, and mixed natural mineral pigments are all collectively referred to as decorative materials, essentially to achieve a specific visual effect. Of course, in other embodiments, other materials can be added to achieve other visual effects.

[0024] The cured base coating is then subjected to plasma activation treatment. Specifically, in this embodiment, the plasma activation treatment involves using 300W power in a specific atmospheric environment to perform a 90-second plasma activation treatment on the cured base coating. Plasma bombardment effectively removes the weak interface layer on the surface and simultaneously etches to form a nanoscale rough structure, greatly increasing the specific surface area of ​​the substrate. This provides a channel for the penetration of the functional layer slurry, resulting in a strong "locking" mechanical interlocking effect after curing.

[0025] Following this, the functional coating can be applied. In this embodiment, the functional coating is prepared by mixing fluorosilicone-modified microcement, 1.5 wt% of a super hydrophobic agent (perfluoropolyether-modified SiO2), and 0.8 wt% of a hydroxyapatite-loaded silver antibacterial agent. The addition of the super hydrophobic agent gives the functional coating hydrophobic and oleophobic properties. Since both the base coating and the functional coating contain fluorosilicone-modified microcement, good compatibility between the base coating and the functional coating is ensured. This achieves a high degree of matching between the functional layer and the base layer in terms of chemical composition, coefficient of thermal expansion, and modulus of elasticity, avoiding delamination caused by differences in internal stress due to changes in environmental temperature and humidity. When the functional layer comes into contact with the coupling agent-treated base layer, a cross-linking reaction occurs, forming a unified whole. A sealing layer can then be added to the outside of the functional layer. In this embodiment, after the functional coating is applied, a thermochromic sealant is sprayed onto the surface of the functional coating using a 3D-printed vertex. Of course, if other scenarios do not require strict sealing, the sealant spraying may be omitted. Of course, in other implementations, other substances can be added to the functional coating to achieve different functions, such as adding 0.2% carbon nanotubes to improve antistatic properties, with static electricity decay <0.1s; or sprinkling bamboo charcoal powder (200 mesh) on the surface to enhance formaldehyde adsorption function.

[0026] During construction, a gradient application method was adopted to achieve a tight bond between the multiple coating layers: "base reinforcement layer → hydrophobic antibacterial main layer → surface sealing layer". The main layer slurry was designed to be low in viscosity and highly permeable (through the addition of a special water-reducing agent and control of the water-cement ratio), allowing it to partially penetrate into the micropores and cracks of the base layer during application. This, in turn, ensures a tight bond between the multiple coating layers.

[0027] After the coating application is completed, acceptance testing is required. In this embodiment, acceptance testing includes functional testing and aesthetic acceptance. Functional testing includes using a contact angle meter to test hydrophobicity and conducting a simulated beverage spill experiment. Additionally, electromagnetic compatibility testing can be performed according to GB / T 17626.3-2016 to ensure no interference with interactive devices. Aesthetic acceptance involves scanning the coating using a multispectral imager and comparing it with the colors in the design draft to calculate color difference. Furthermore, for textured coatings, multi-person blind testing can be conducted, such as organizing a group of 10 people for blind testing, with 90% of participants accurately perceiving the tactile characteristics of the corresponding theme as the standard.

[0028] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method for applying a microcement antibacterial and hydrophobic coating, characterized in that: Using fluorosilicone modified microcement as raw material, a base coating and a functional coating were prepared. A silane coupling agent was added to the base coating. After the base coating was applied to the wall and cured to form a base coating, the base coating was subjected to plasma activation treatment. Then, an antibacterial coating of mixed oil super hydrophobic agent was applied to the base coating to form a functional coating. Finally, the functional performance of the coating was tested and the aesthetics were accepted.

2. The method for constructing a microcement antibacterial and hydrophobic coating according to claim 1, characterized in that: When applying the base coat, texture is created by using a scraper to modify the base coat into the desired shape.

3. The method for constructing a microcement antibacterial and hydrophobic coating according to claim 2, characterized in that: During the application of the base coating, decorative materials are simultaneously incorporated, including at least one of ceramic microspheres, fluorescent powder, or mixed natural mineral pigments.

4. The method for constructing a microcement antibacterial and hydrophobic coating according to any one of claims 1-3, characterized in that: Before applying the base coat, use a dust-free grinder to grind the concrete surface to Sa2.5 cleanliness level, remove oil stains and dust, and repair the joints of the plasterboard.

5. The method for constructing a microcement antibacterial and hydrophobic coating according to claim 4, characterized in that: When repairing the joints of gypsum board, make a V-shaped groove at the joint, keeping the groove depth at least 3mm, and then inject epoxy resin repair adhesive.

6. The method for constructing a microcement antibacterial and hydrophobic coating according to any one of claims 1-3, characterized in that: The plasma activation treatment involves using 300W power to perform a 90-second plasma activation treatment on the cured base coating under a specific atmospheric environment.

7. The method for constructing a microcement antibacterial and hydrophobic coating according to any one of claims 1-3, characterized in that: After the functional coating is applied, a thermochromic sealant is sprayed onto the surface of the functional coating using 3D-printed vertices.

8. The method for constructing a microcement antibacterial and hydrophobic coating according to any one of claims 1-3, characterized in that: The functional testing includes using a contact angle meter to test hydrophobicity and simulating beverage spillage experiments.

9. The method for constructing a microcement antibacterial and hydrophobic coating according to any one of claims 1-3, characterized in that: The aesthetic acceptance process includes scanning the coating with a multispectral imager and comparing it with the colors in the design draft to calculate the color difference.