Construction method for accurately controlling coating thickness and shape of paint

Abstract

The invention discloses a construction method for accurately controlling the coating thickness and shape of a coating, and belongs to the field of coating construction, and the method comprises the following steps: coating the coating on hydrophobic / oiled paper at one time and leveling to the required thickness, spraying a super-hydrophobic modifier on the surface, sealing a layer of hydrophobic / oiled paper / film, and padding a mold cushion block with the required thickness between the two layers of hydrophobic / oiled paper / film, then surface drying is performed to ensure that the coating is not completely cured, orange peel does not appear on the surface, and the plastic characteristic is achieved; cutting the coating into a required shape; the coating is attached to a substrate; and after the coating is attached, anchoring pressure is applied to the peripheral coating until the coating is cured and anchored, so that the thickness and the shape of the coating are accurately controlled. According to the invention, the problem of non-uniform thickness caused by sagging during thick coating of water-based or oil-based paint is solved; spraying equipment and the like are not needed during coating construction, and operation is simple; and for a complex structure, uniform-thickness and compact painting can be easily realized in manners of cutting, splicing and the like.

Description

Technical Field

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

[0002] The performance requirements of coatings in industries such as real estate, automobile manufacturing, shipbuilding, furniture and home appliances, container manufacturing, bridge construction, steel structure engineering, rail transit and new energy are getting higher and higher. For aesthetic considerations and the needs of different application fields, the thickness of coatings is also required to be precisely controlled. In order to ensure its workability, the coatings on the market currently have strong flowability. When it comes to complex components and facade structural units, sagging often occurs, resulting in uneven thickness of the coating, which not only affects the appearance, but also greatly reduces the protective function of the coating, and ultimately causes the structure to fail in the service environment. This problem is particularly serious for thick 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, while reducing the adhesion of the coating, and cannot effectively control the uniformity of the coating thickness. Therefore, it is of great engineering significance to design a method that can accurately control the coating thickness and meet the requirements of complex component construction and coating. Summary of the invention

[0003] Based on the above shortcomings, the present invention provides a construction method for accurately controlling the coating thickness and shape of the paint, which solves the problem that the coating thickness is difficult to control uniformly and the coating construction of complex components is difficult.

[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 on the hydrophobic / oily paper once to the required thickness, spray the surface with a superphobic modifier and seal it with another layer of hydrophobic / oily paper / film, place a mold pad of the required thickness between the two layers of hydrophobic / oily paper / film, and then dry it on the surface to ensure that the coating will not be completely cured and that the surface will not have orange peel and has plastic characteristics;

[0006] S2, cutting the coating into the required shape;

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

[0008] S4. After the coating is pasted, 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 super-hydrophobic 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 / membrane described in step S1 is a hydrophobic / oil paper / membrane with low surface energy.

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

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

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

[0014] Furthermore, before the coating is applied on 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 pasted, a film is wrapped around the periphery 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 as described above.

[0018] Beneficial effects of the present invention: The present invention utilizes the property of the coating surface that is not completely cured and has plastic deformation ability, and obtains a specific shape and size through external molds and cutting, and then combines the pretreatment of the bonding surface and the coating bonding surface, plus the external binding force, and finally achieves precise control of thickness and shape, and complete coating of complex components, ensuring the high bonding performance and protective performance of the coating, the aesthetics of the building structure, etc. The construction process does not require large-scale equipment, there is no complicated operating procedure, and the cost is low, and large-area rapid construction can be achieved. For thick coatings, this construction method is more efficient and can meet the construction needs of various complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a diagram of the construction and thickness control mechanism of the sandwich type non-contact closed space;

[0020] Figure 2 The process flow chart of the construction method is as follows;

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

[0022] Figure 4 The following 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 content of the present invention as an explanation of 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 test materials and reagents used in the following examples, unless otherwise specified, can be obtained from commercial sources. 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] Embodiment 1:

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

[0028] S1: Add 10g of γ-glycidyloxypropyl trimethoxysiloxane to 20ml of 3mol / L aluminum dihydrogen phosphate solution, then add 0.6g of hexadecyl trimethyl ammonium bromide, stir evenly, add 3g of silica aerogel, 4.3g of nano titanium oxide, 4.3g of nano aluminum oxide and 5g of nano zinc oxide powder, ultrasonically disperse for 20 minutes and let stand until the bubbles disappear. Pour the prepared coating on the plastic wrap and level it to 5mm with the help of the mold pad of the required thickness, spray the trimethylethoxysilanol solution, cover it with a layer of plastic wrap, and leave it at room temperature for 3d to dry on the surface.

[0029] S2: Cut the surface-dried paint to the size of the surface of the steel pipe to be coated using a hydrophobic knife.

[0030] S3: First, clean the surface of the steel pipe with deionized water and acetone for three times, and peel off the dried paint from the plastic wrap. Then use an atomizer to spray KH-560 on the surface of the steel pipe and the bonding surface of the paint 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 at the interface 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. Leave it at room temperature for 4 days. When the paint solidifies and dries 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 result of the coating surface after super-hydrophobic treatment shows 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) The cleaning and wetting of the steel pipe surface and the 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 paint is not completely 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] Embodiment 2:

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

[0039] S1: The selected epoxy resin is bisphenol A type E44, and the selected curing agent is polyetheramine D230. This coating product can be obtained from commercial sources. 40g bisphenol A epoxy resin and 20g polyetheramine D230 are mixed evenly and poured on oleophobic paper with pads and molds around to control the thickness to 3mm. The surface is sprayed with fluorine-silicon modified nano-silicon dioxide solution, and then covered with a layer of oleophobic paper. It is left at room temperature for 1 day to dry on the surface.

[0040] S2: Cut the surface-dried paint to the size of the surface of the steel pipe to be coated using a knife with an oleophobic surface.

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

[0042] S4: Wrap the outside of the steel pipe with greaseproof paper to apply an external binding force to the paint. Leave it at room temperature for 2 days. When the paint solidifies and dries to a certain hardness, remove the greaseproof 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 over a large area, the coating must be intact and dense. After the coating is completely dry and solidified, liquid coating is used to fill the bonding seams to ensure the excellent protective effect of the coating.

[0045] Embodiment 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-iron tetroxide powder, 40g of nano-titanium dioxide powder, 20g of nano-zinc oxide powder, and 20g of nano-alumina powder to 110g of siloxane, and ultrasonically disperse for 30min, add curing agent and stir for 30min. Pour the prepared coating on the plastic wrap, add pads around the mold to control the thickness to 5mm, spray M100 nano-oleophobic modifier, and leave it at room temperature for 2d to dry on the surface.

[0048] S2: Use an oil-repellent 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 complete dense coating through multiple constructions.

[0049] S3: First, clean the steel plate surface with deionized water and acetone for 3 times, and peel off the 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. Adhere the paint tightly to the surface of the component, and 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. Leave it at room temperature for 2 days. When the paint solidifies and dries 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 key points of construction. Dividing the joints into small pieces and constructing them multiple times can ensure a tighter coating. Then, a highly fluid liquid coating is used to seal the gaps at 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. During the facade construction, it is difficult to avoid the occurrence of sagging. The surface intervention 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 finished products, indicating that the construction method is simple to operate and can achieve the coating of complex structures and graphics.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A construction method for accurately controlling the coating thickness and shape of a coating, characterized in that: The steps are as follows: S1. Apply the coating on the hydrophobic / oily paper once to the required thickness, spray the surface with a superphobic modifier and seal it with another layer of hydrophobic / oily paper / film, place a mold pad of the required thickness between the two layers of hydrophobic / oily paper / film, and then dry it on the surface to ensure that the coating will not be completely cured and that the surface will not have orange peel and has plastic characteristics; S2, cutting the coating into the required shape; S3, applying the coating to the substrate; S4. After the coating is pasted, 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 of a coating according to claim 1, characterized in that: The super-hydrophobic 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 coating construction method according to claim 1, characterized in that: The hydrophobic / oil paper / film described in step S1 is a hydrophobic / oil 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 oil-proof paper.

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

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

7. A construction method for accurately controlling the coating thickness and shape of a coating 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 of a coating 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 of a coating according to claim 1, characterized in that: In step S4, after the coating is pasted, a film is wrapped around the outside to apply anchoring pressure, and the film is removed after the coating is cured and has hardness.

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

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