A construction method for precisely controlling coating thickness and shape

Abstract

The invention discloses a construction method for accurately controlling the coating thickness and shape, which belongs to the field of coating construction. The method is as follows: the coating is brushed and leveled to the required thickness on hydrophobic / oil paper once, the surface is sprayed with a super-phobic modifier and another layer of hydrophobic / oil paper / film is sealed, a mold pad of the required thickness is padded between the two layers of hydrophobic / oil paper / film, and then the surface is dried to ensure that the coating will not be completely cured, and orange peel will not appear on the surface, with plastic characteristics; cutting the coating to the required shape; fitting the coating on the substrate; after the coating is fitted, the pressure of anchoring is applied to the peripheral envelope to solidify and anchor, thereby accurately controlling the thickness and shape of the coating. The present invention solves the problem of uneven thickness caused by sagging during thick coating of water-based or oil-based paints; coating construction does not require equipment such as spraying, and is simple to operate; for complex structures, uniform and dense thickness can be easily achieved by cutting and splicing.

Description

Technical Field

[0001] The invention belongs to the field of coating construction, and in particular relates to a construction method for accurately controlling the coating thickness and shape of the coating. Background Art

[0002] Industries such as real estate, automobile manufacturing, shipbuilding, furniture and home appliances, container manufacturing, bridge construction, steel structure engineering, rail transportation, and new energy have increasingly higher requirements for the performance of coatings. For aesthetic reasons and the needs of different application fields, there is also a requirement for precise control of the thickness of the coating. In order to ensure its workability, the coatings currently on the market have strong fluidity. When applied to complex components and facade structural units, sagging often occurs, resulting in uneven thickness of the coating. This not only affects the aesthetics, but also greatly reduces the protective function of the coating, ultimately causing the structure to fail in the service environment. This problem is particularly serious for thick-coated coatings. The existing improvement method of multiple thin coatings is not only time-consuming and labor-intensive, but also constantly introduces new and old interfaces during the multiple thin coatings, destroying the integrity of the coating and reducing the adhesion of the coating. In addition, it is not very effective in controlling the uniformity of the coating thickness. Therefore, designing a method that can accurately control the coating thickness and meet the requirements of complex component construction and coating has very far-reaching engineering significance. Summary of the Invention

[0003] In view of the above shortcomings, the present invention provides a construction method for accurately controlling the coating thickness and shape of the paint, which solves the problems of difficulty in controlling the uniform coating thickness and difficulty in coating complex components.

[0004] The technical solution adopted by the present invention is as follows: a construction method for accurately controlling the coating thickness and shape of the coating, the steps are as follows:

[0005] S1. Apply the coating once on hydrophobic / oily paper to the desired thickness, spray the surface with a superphobic modifier and seal with another layer of hydrophobic / oily paper / film. Place a mold spacer of the desired thickness between the two layers of hydrophobic / oily paper / film, and allow the coating to dry completely. Ensure that the coating does not completely solidify and that the surface does not show orange peel, showing plastic characteristics.

[0006] S2, cutting the paint into the desired shape;

[0007] S3, applying the coating to the substrate;

[0008] S4. After the coating is applied, anchoring pressure is applied to the outer membrane until it is solidified and anchored, so as to accurately control the thickness and shape of the coating.

[0009] Furthermore, the superphobic modifier described in step S1 is trimethylethoxysilanol solution, trichloro(1H,1H,2H,2H-perfluorooctyl)silanol solution, fluorosilicone-modified nano-silica solution, nano-silica sol super-hydrophobic modifier or M100 nano-oleophobic modifier.

[0010] Furthermore, the hydrophobic / oil paper / film described in step S1 is a hydrophobic / oil paper / film with low surface energy.

[0011] Furthermore, the paper / film is plastic wrap, silicone oil paper or greaseproof paper.

[0012] Furthermore, in step S1 , a mold of a specific shape is used during the coating process to obtain the desired shape.

[0013] Furthermore, in step S2, in order to ensure the integrity and continuity of the coating, the coating is added to the missing parts after cutting to a complete shape, or a cutting tool with a hydrophobic / oleophobic surface treatment is selected.

[0014] Furthermore, before the coating is applied to the substrate, a silane coupling agent or coating is used to wet the surface of the substrate.

[0015] Furthermore, the bonding surface of the coating is moistened with a silane coupling agent or coating.

[0016] Furthermore, in step S4, after the coating is applied, it is wrapped with a film to apply anchoring pressure, and the film is removed after the coating is cured and has hardness.

[0017] The present invention also provides a coating protective layer obtained by the construction method described above.

[0018] The present invention utilizes the plastic deformation properties of uncured paint, allowing for specific shapes and sizes to be achieved through the addition of molds and cutting. Combined with pretreatment of the bonding surface and the coating bonding surface, coupled with an applied binding force, precise control of thickness and shape is achieved, enabling complete coating of complex components, ensuring the coating's high bonding and protective properties, and enhancing the aesthetics of the building structure. The construction process requires no large-scale equipment or complex operating procedures, is low-cost, and allows for rapid, large-scale construction. This construction method is more efficient for thick-coated coatings and can accommodate construction in a variety of complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Diagram of the construction and thickness control mechanism of sandwich-type non-contact enclosed space;

[0020] Figure 2 The following is a process flow chart of the construction method;

[0021] Figure 3This is a diagram showing the non-wetting effect after super-hydrophobic treatment;

[0022] Figure 4 This is a schematic diagram of the construction method on a steel pipe;

[0023] Figure 5 This is the finished product drawing of this construction method on irregular components. DETAILED DESCRIPTION

[0024] The following embodiments are further descriptions of the present invention to illustrate the technical content of the present invention, but the essential content of the present invention is not limited to the following embodiments. Ordinary technicians in this field can and should know that any simple changes or replacements based on the essential spirit of the present invention should fall within the scope of protection required by the present invention.

[0025] In addition, the experimental materials and reagents used in the following examples can be obtained from commercial channels unless otherwise specified. If no specific techniques or conditions are specified in the examples, they can be carried out according to the techniques or conditions described in the literature in the field or according to the product instructions.

[0026] Example 1:

[0027] Example 1 provides a ratio of a fireproof and heat-insulating water-based ceramic coating and a construction method for a curved steel pipe structure, as detailed below:

[0028] S1: Add 10g of γ-glycidyloxypropyltrimethoxysiloxane and 0.6g of cetyltrimethylammonium bromide to 20ml of 3mol / L aluminum dihydrogen phosphate solution. Stir thoroughly, then add 3g of silica aerogel, 4.3g of nano-titanium oxide, 4.3g of nano-aluminum oxide, and 5g of nano-zinc oxide powder. Ultrasonic dispersion is performed for 20 minutes, followed by stabilization until bubbles disappear. Pour the prepared coating onto plastic wrap and level it to 5mm with the aid of a mold spacer of the desired thickness. Spray with trimethylethoxysilanol solution, cover with another layer of plastic wrap, and let it dry at room temperature for 3 days.

[0029] S2: Use a hydrophobic cutter to cut the surface-dried paint to the size of the surface of the steel pipe to be coated.

[0030] S3: First, clean the surface of the steel pipe with deionized water and acetone three times, and peel off the surface-dried paint from the plastic wrap. Then use an atomizer to spray KH-560 on the surface of the steel pipe and the paint bonding surface to moisten it, and stick the paint tightly to the surface of the steel pipe. If the interface is not completely fitted, fill the gap with high-fluidity liquid paint.

[0031] S4: Wrap plastic wrap around the outside of the steel pipe to apply an external binding force to the paint. Let it stand at room temperature for 4 days. The paint will solidify and dry to a certain hardness. Remove the plastic wrap to complete the construction.

[0032] like Figure 3 As shown in the figure, the dynamic contact angle test results of the coating surface after super-hydrophobic treatment show that it exhibits super-hydrophobic properties with a contact angle of up to 153.6°, which fully ensures the stable existence of non-contact closed space during the construction process and provides a guarantee for the semi-curing control of the coating.

[0033] This embodiment has the following characteristics:

[0034] (1) Cleaning and wetting of the steel pipe surface and wetting of the coating bonding surface improve the bonding performance of the coating and are beneficial to increasing the service life of the coating.

[0035] (2) The coating is not fully cured and can undergo large deformation, which can well meet the construction requirements of curved structures such as steel pipes.

[0036] (3) For structures that need to be covered with surface-drying paint, there are often incomplete joints. The gaps can be repaired with paint to ensure the integrity of the paint coverage.

[0037] Example 2:

[0038] Example 2 provides a construction method for epoxy resin coating flat steel plate structure, the details of which are as follows:

[0039] S1: The selected epoxy resin is bisphenol A type E44, and the selected curing agent is polyetheramine D230. This coating product is commercially available. Mix 40g of bisphenol A epoxy resin and 20g of polyetheramine D230. Pour the mixture onto oleophobic paper, surrounding it with spacers and a mold to control the thickness to 3mm. Spray the surface with a fluorosilicone-modified nano-silica solution, then cover with a layer of oleophobic paper. Let it dry at room temperature for 1 day.

[0040] S2: Use an oleophobic cutter to cut the surface-dried paint to the size of the surface of the steel pipe to be coated.

[0041] S3: First, clean the steel plate surface with deionized water and acetone three times, and peel off the surface-dried paint from the oleophobic paper. Then use an atomizer to spray KH-550 on the surface of the steel pipe and the paint bonding surface to moisten it. The paint should be tightly attached to the surface of the steel pipe. If the interface is not completely attached, fill the gap with high-fluidity liquid paint.

[0042] S4: Wrap oleophobic paper around the outside of the steel pipe to apply an external binding force to the paint. Leave it at room temperature for 2 days until the paint solidifies and dries to a certain hardness. Remove the oleophobic paper to complete the construction.

[0043] This embodiment has the following characteristics:

[0044] (1) For flat steel plates, the construction complexity is smaller. When constructing on a large area, the coating must be intact and dense. After the coating is completely dry and solidified, the bonding seams should be filled with liquid coating to ensure the excellent protective effect of the coating.

[0045] Example 3:

[0046] Example 3 provides a construction method for a siloxane coating with a variable diameter and irregular steel pipe structure, as detailed below:

[0047] S1: Add 10g of nano-ferroferric oxide powder, 40g of nano-titanium dioxide powder, 20g of nano-zinc oxide powder, and 20g of nano-aluminum oxide powder to 110g of siloxane. Ultrasonic dispersion is performed for 30 minutes. A curing agent is added and stirred for 30 minutes. The prepared coating is poured onto plastic wrap, surrounded by spacers to control the thickness to 5mm. M100 nano-oleophobic modifier is sprayed on the coating and allowed to dry at room temperature for 2 days.

[0048] S2: Use an oleophobic cutter to cut the surface-dried paint to the size of the irregular component to be coated. For complex joints of components, appropriately reduce the area of ​​unit paint and apply multiple times to complete dense coating.

[0049] S3: First, clean the steel plate surface with deionized water and acetone three times, and peel off the surface-dried paint from the plastic wrap. Then use an atomizer to spray KH-590 on the surface of the component and the paint bonding surface to moisten it. The paint should be tightly attached to the surface of the component. Use high-fluidity liquid paint to fill the gaps at the interface, especially the complex joints.

[0050] S4: Wrap plastic wrap around the outside of the steel pipe to apply an external binding force to the paint. Let it stand at room temperature for 2 days. The paint will solidify and dry to a certain hardness. Remove the plastic wrap to complete the construction.

[0051] This embodiment has the following characteristics:

[0052] (1) For the coating of irregular and complex components, the complex joints are the difficulty and focus of the construction. Dividing the area into small pieces and constructing them multiple times can ensure a tighter coating. Then, a high-fluidity liquid coating is used to seal the gaps in the joints, which better ensures the density and integrity of the coating and gives full play to its protective function.

[0053] (2) The uncured paint itself has good fluidity. It is difficult to avoid sagging during facade construction. The surface treatment method not only solves this problem, but also ensures the precise control of the coating thickness and the beauty of the building structure, which has practical engineering significance.

[0054] Figure 4 and Figure 5 It is a simple display of the construction process and the finished product, showing that the construction method is simple to operate and can achieve the coating of complex structures and graphics.

[0055] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clarifying the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A construction method for accurately controlling the coating thickness and shape, characterized in that: The steps are as follows: S1. Apply the coating once on hydrophobic / oily paper to the desired thickness, spray the surface with a superphobic modifier and seal with another layer of hydrophobic / oily paper / film. Place a mold spacer of the desired thickness between the two layers of hydrophobic / oily paper / film, and allow the coating to dry completely. Ensure that the coating does not completely solidify and that the surface does not show orange peel, showing plastic characteristics. S2, cutting the paint into the desired shape; S3, applying the coating to the substrate; S4. After the coating is applied, anchoring pressure is applied to the outer membrane until it is solidified and anchored, so as to accurately control the thickness and shape of the coating.

2. A construction method for accurately controlling the coating thickness and shape according to claim 1, characterized in that: The superphobic modifier described in step S1 is trimethylethoxysilanol solution, trichloro(1H,1H,2H,2H-perfluorooctyl)silanol solution, fluorosilicone-modified nano-silica solution, nano-silica sol super-hydrophobic modifier or M100 nano-oleophobic modifier.

3. A construction method for accurately controlling the coating thickness and shape according to claim 1, characterized in that: The hydrophobic / oil-repellent paper / film described in step S1 is a hydrophobic / oil-repellent paper / film with low surface energy.

4. A construction method for accurately controlling the coating thickness and shape according to claim 3, characterized in that: The paper / film is a fresh-keeping film, silicone oil paper or greaseproof paper.

5. A construction method for accurately controlling the coating thickness and shape according to claim 1, characterized in that: In step S1 , a mold of a specific shape is used to obtain the desired shape during the coating process.

6. A construction method for accurately controlling the coating thickness and shape according to claim 1, characterized in that: In step S2, to ensure the integrity and continuity of the coating, the coating is added to the missing parts after cutting to complete the shape, or a cutting tool with a hydrophobic / oleophobic surface treatment is selected.

7. A construction method for accurately controlling the coating thickness and shape according to claim 1, characterized in that: In step S3, before the coating is applied to the substrate, the surface of the substrate is moistened with a silane coupling agent or coating.

8. A construction method for accurately controlling the coating thickness and shape according to claim 1, characterized in that: In step S3, the bonding surface of the coating is moistened with a silane coupling agent or coating.

9. A construction method for accurately controlling the coating thickness and shape according to claim 1, characterized in that: In step S4, after the coating is applied, a film is wrapped around the periphery to apply anchoring pressure, and the film is removed after the coating is cured and hardened.

10. A coating protective layer obtained according to the construction method according to any one of claims 1 to 9.

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