CN116078638A

CN116078638A - Coating method of matte paint

Info

Publication number: CN116078638A
Application number: CN202211633612.5A
Authority: CN
Inventors: 杨旭; 张超; 张子铭; 彭立民; 李小科; 姜俊
Original assignee: Hongmufang Home Technology Huzhou Co ltd
Current assignee: Hongmufang Home Technology Huzhou Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-05-09

Abstract

The embodiment of the application discloses a coating method of matte paint, which comprises the steps of coating paint on the surface of a plate to form a leveling coating, pre-curing the leveling coating to form a pre-cured paint film through a pre-curing step, and curing the pre-cured paint film to form a matte paint film through a curing step; wherein the pre-curing step is carried out under the protection of a single gas component, and the wave band of the used UV light is 150-200 nm; the curing step is performed in an air environment, and the wave band of the UV light is 400-600 nm. The coating method of the matte paint can coat and solidify to form a matte paint film with luminosity as low as 2-4 degrees, and the paint film has relatively good visual effect; meanwhile, when the surface is slightly scratched, scratches are not easy to detect, and the self-repairing effect is formed by the visual angle; the matt paint can achieve a coating weight of up to 50 g/square meter, and thus a relatively high paint film hardness.

Description

Coating method of matte paint

Technical Field

The invention relates to the technical field of paint coating, in particular to a method for coating matte paint.

Background

Wooden floor surfaces often require painting to achieve protection and aesthetics. The paint film is a resin film with luminosity, and can reflect light under the irradiation of sunlight. Under the irradiation of strong sunlight, certain paint films with higher luminosity can influence the more glaring reflection even indoors, thereby increasing light pollution and affecting the life quality.

The paint coating technology using ultraviolet light as curing condition is a commonly applied mode of paint coating of wooden floor in the prior art, and has the advantages of assembly line function, high production efficiency, stable film forming effect and the like. Generally, the ultraviolet curing lamp performs curing under natural conditions, i.e. is exposed to air, and ultraviolet light with longer wave band (generally 400-600 nm) is selected to eliminate the influence of oxygen in the air on the irradiation intensity and irradiation distance of the ultraviolet light. The ultraviolet curing process in the prior art can prepare a matte paint film with the luminosity of about 15 degrees by adjusting the paint formula and selecting a relatively low ultraviolet light wave band.

In order to further reduce the luminosity of the paint film, the prior art also utilizes an excimer light source to be matched with the matte paint to prepare a matte paint film with the luminosity of about 10 degrees. However, the film forming effect is difficult to control when the paint film is cured, and the quality problem of paint film wrinkling often occurs. In addition, in practical use, the luminosity of about 10 degrees can still form certain reflection. For this reason, there is a lack of a coating method in the prior art which can produce paint coatings of lower luminosity.

Disclosure of Invention

The application provides a method for coating matte paint.

In one aspect of the application, a method for coating a matte paint is provided, wherein a paint coating step is performed to coat paint on the surface of a plate to form a leveling coating layer, then the leveling coating layer is pre-cured to form a pre-cured paint film through a pre-curing step, and then the pre-cured paint film is cured to form a matte paint film through a curing step; wherein,,

the pre-curing step is carried out under the protection of a single gas component, and the wave band of the used UV light is 150-200 nm;

the curing step is performed in an air environment, and the wave band of the UV light is 400-600 nm.

Preferably, the single gas component is an inert gas.

Preferably, the single gas component is nitrogen.

Preferably, the purity of the nitrogen of the single gas component is 99.5-99.9%, and the aeration pressure is more than or equal to 1.5MPa.

Preferably, in the step of coating the paint, the coating amount of the paint is 20 to 50 g/square meter.

Preferably, the step of leveling is performed to improve the flatness of the surface of the sheet material prior to the step of applying the paint.

Preferably, the leveling treatment is sequentially performed by wetting, drying and sanding the surface of the board.

Preferably, the wetting treatment is to coat deionized water on the surface; the drying process heats the surface using a heat source to achieve drying, and the heat source has a distance of 5 to 10mm from the surface.

Preferably, the pre-curing step is performed under a negative pressure environment, so that the leveling coating is pre-cured in an expanded state, and the pre-cured paint film in an expanded state is formed.

Preferably, between the pre-curing step and the curing step, the pre-cured paint film is brought back to its shape by a step of atmospheric buffering.

In summary, compared with the prior art, the invention has the following beneficial effects:

1. the coating method of the matte paint can coat and solidify to form a matte paint film with luminosity as low as 2-4 degrees, and the paint film has relatively good visual effect; meanwhile, when the surface is slightly scratched, scratches are not easy to detect, and the self-repairing effect is formed by the visual angle; the matt paint can achieve a coating weight of up to 50 g/square meter, and thus a relatively high paint film hardness.

2. Further, through the arrangement of the leveling treatment step, the technical scheme of the application expands the breadth of the plate which can be adapted to the matte paint coating method, and can obtain relatively good paint decoration effect and yield by treating the plate with large breadth, so that the occurrence of defective products is reduced or even avoided.

3. Furthermore, the technical scheme of the application is that the pre-curing step is carried out in negative pressure, so that the matte paint can be prepared on the archaized surface with the concave-convex degree within a certain range.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic diagram of a film forming state of the application method of the matte paint of example 1 of the present application.

Fig. 2 is a schematic structural view of an apparatus for performing the pre-curing step of example 1 of the present application.

Fig. 3 is a flow chart illustrating the steps of the leveling process in embodiment 2 of the present application.

Fig. 4 is a flow chart illustrating the steps of the leveling process in embodiment 3 of the present application.

Fig. 5 is a schematic diagram of the positional relationship between the hot roller and the surface of the sheet material in example 4 of the present application.

Fig. 6 is a schematic structural view of a vacuum cassette of embodiment 5 of the present application.

In the figure: 100. plate, 210, leveling coating, 220, pre-cured paint film, 221, the outermost layer, 222, main thickness layer, 230, matte paint film, 310, ultraviolet curing lamp, 320, air inlet, 330, air knife, 410, hot roller, 500, vacuum box, 510, box body, 520, gate, 530, ultraviolet lamp group, 540 and vacuum suction port.

Detailed Description

In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

Example 1

The embodiment discloses a method for coating matte paint, which is shown by referring to fig. 1, specifically comprises the following steps: first, a leveling coating layer 210 is formed by a paint coating step to apply paint to the surface of the board 100, then a pre-curing step is performed to pre-cure the leveling coating layer 210 to form a pre-cured paint film 220, and finally a curing step is performed to cure the pre-cured paint film 200 to form a matte paint film 230. In particular, the pre-curing step is carried out under the protection of a single gas component, and the wave band of the UV light is 150-200 nm; the curing step is carried out in an air environment, and the wave band of the UV light is 400-600 nm.

By the above method, after the leveling coating 210 is formed on the surface of the plate 100, only the outermost layer 221 of the leveling coating 210 is heated to expand with a relatively small irradiation intensity by using the ultraviolet light of a short wavelength band, and is cured under the ultraviolet light condition; the bulk thickness layer 222 of the leveling coating below the cured top-most layer 221 remains in an oily state. Thus, the pre-cured paint film 220 is a composite layer comprising a cured top-most layer 221 and an uncured bulk thickness layer 222. The cured outermost layer 221 floats above the body thickness layer 222 and is limited by the breadth of the body thickness layer 222 so as not to change expansion, so that the cured outermost layer 221 exhibits a uniformly contracted, non-smooth morphology. Finally, the bulk thickness layer 222 of the pre-cured paint film 220 is cured by the curing step at a relatively large uv light irradiation intensity to yield an integrally cured matte paint film 230. The paint film 230 has uniform shrinkage, irregular micro pit depressions and a non-smooth surface, so that the luminosity of the matte paint film 230 can be reduced to 2-4 degrees of matte effect, and the paint film has relatively good visual effect.

In the method, the ultraviolet light intensity of the short wave band is relatively weak, and the pre-curing step is carried out under the protection of a single gas component so as to avoid the influence of different gas components in the air on the illumination distance and intensity, so that the coating quality is more stable.

Further, since the matte effect is achieved by scattering light rays through the irregular micro-pit depressions on the surface, the matte paint film 230 has the advantages of being full and good in definition. More importantly, when slight scratches occur on the surface of the matte paint film 230, the scratches are not easily perceived, thereby creating a self-healing effect from a visual perspective.

In particular, the single gas component should be an inert gas, preferably nitrogen. In theory, the higher the gas purity of nitrogen and the higher the inflation pressure, the better the treatment effect of the pre-curing step, but from the practical and cost point of view, the purity of nitrogen is selected to be 99.5-99.9%, so that the inflation pressure is higher than 1.5MPa.

As a preferred embodiment, since the leveling coating layer 210 of the present example is formed into a film by curing twice through the pre-curing step and the curing step, in practice, the allowable coating thickness of the leveling coating layer 210 formed by the matte paint coating process can be relatively thick. The leveling coating thickness (i.e. coating thickness) of the UV-cured matt paint in the prior art is generally 20-35 g/square meter, and the leveling coating 210 of the embodiment can reach 50 g/square meter, i.e. the technical scheme of the embodiment allows the coating thickness in the range of 20-50 g/square meter. Thus, the cured matte paint film 230 has a relatively high film hardness.

The method of applying the matt paint of the present embodiment may be directly performed on the surface of the board 100, or may be used as one of the processes to replace the prior art matt paint application process in the paint application process. The method comprises the following steps:

step one, coating a water-based primer on the surface of the plate 100 in a roller coating manner, and drying the water-based primer through an infrared leveling tunnel; sanding to prepare the primer coating.

Coating a plurality of functional primer layers on the water-based primer in a roller coating and/or curtain coating mode, wherein the coating weight of the functional primer layers is 20-25 g/square meter, and the treatment time is 2-3 s; sanding to prepare the application of the topcoat.

Step three, coating wear-resistant finish paint on the functional primer in a roller coating mode, wherein the coating amount of the wear-resistant finish paint is 25 g/square meter, and the treatment time is 3s through UV ultraviolet light curing, wherein the wavelength of ultraviolet light is 550 nm; sanding to prepare for application of the matt paint.

Step four, coating matte paint;

step four, paint coating, namely coating matte paint on the wear-resistant finish paint in a roll coating mode, wherein the coating weight is as follows

45 g/square meter, forming a leveling coating 210;

a step of pre-curing in the step four, wherein the plate 100 is cured by UV (ultraviolet) under the protection of nitrogen to obtain a pre-cured paint film 220, wherein the purity of the nitrogen is 99.8%, the inflation pressure is 2.0MPa, and the wavelength of the UV is 170nm

The processing time is 2s;

and in the step four, curing, namely curing the plate 100 in a natural working environment (namely an air environment) by using UV (ultraviolet) to obtain the matt paint film 230, wherein the wavelength of the UV is 450nm, and the treatment time is 3s.

Of course, it will be understood by those skilled in the art that the second and third steps may be omitted and the matte paint may be applied directly to the water-borne base paint.

The paint coating process is realized through a paint coating assembly line in the prior art, and equipment of the pre-curing step in the fourth process is slightly different from that of a UV (ultraviolet) curing machine in the prior art. Specifically, referring to fig. 2, an environment that allows a single gas component to enter and exit should be provided, for example, an air inlet 320 for introducing nitrogen into the space below the uv curing lamp 310, an air knife 330 for forming a nitrogen curtain in front of and behind the uv curing lamp 310, and the air inlet 320 and the air knife 330 disposed in front of and behind the uv curing lamp are connected to an external nitrogen source line.

Example 2

Example 2 is different from example 1 in that the flatness of the surface of the board 100 is improved by a leveling process step before the paint coating step. The sheet material 100 processed in this example had a width of 150mm×15000mm.

In a long production time, the inventors found that the coating method of the matte paint of example 1 can obtain relatively good treatment effect and high yield when treating the board 100 with relatively small breadth and extremely high flatness, but the phenomenon of film wrinkling is extremely easy to occur when treating the board 100 with relatively large breadth and slightly uneven surface. This may be due to the relatively small uv light energy received by the leveling coating 210 itself, and when the leveling coating 210 is uneven, i.e., the distance between the leveling coating 210 and the uv light curing lamps is not exactly equal, uneven shrinkage may occur at too large or too small a distance, thereby forming more serious wrinkles. For this reason, the inventor has set the steps of the leveling process to initially improve the flatness of the surface of the board 100, so that even if the board 100 with a large width is processed, a relatively good painting effect and yield can be obtained, and occurrence of defective products can be reduced or even avoided.

Referring to fig. 3, the leveling process of the present embodiment includes the steps of sequentially performing a wetting process, a drying process, and a sanding process on the surface of the board 100. For example, the wetting treatment is to coat deionized water on the surface of the plate 100 by roll coating in an amount of 15 to 20 g/square meter; the drying treatment is to dry the surface of the wetted plate 100 through an infrared leveling tunnel, and the drying time is 5-10 s; the sanding process is accomplished using prior art sanders.

This step may be repeated a number of times, typically 2 to 3 times. This step may be used in place of the first step in example 1 or as a step of the preparation process before the first step in example 1. Of course, when this step is used in place of the procedure of example 1, at least the last wetting treatment should use an aqueous primer.

In this embodiment, the wood fiber on the surface can be erected by wetting the surface of the board 100 and cured to some extent after the drying treatment, so that a smoother sanded surface can be obtained at the time of sanding. Further, by repeating the above steps a plurality of times, it is possible to (1) increase the amount of sand light to sand off the unevenness of the surface itself and (2) make the sanded surface finer and smoother, thereby providing a treated surface with a relatively high flatness for the application of the matt paint.

Example 3

Example 3 is different from example 2 in that, referring to fig. 4, the drying process heats the surface using a heat source to achieve drying. For example, sheet 100 having a wetted surface is passed through a section of heated roller 410, and sheet 100 is passed through section of heated roller 410 with the outer edge of the roller abutting the surface of sheet 100. Depending on the number of hot drums 410, the temperature, and the length of heat source required (i.e., the drying time). In this example, the length of the section of the hot roller 410 is 2m, and the temperature of the hot roller 410 is 120 ℃.

Since the hot roller 410 provides heat to the surface of the sheet material 100 to dry it, it can additionally improve the flatness thereof by the contact of the roller surface with the surface of the sheet material 100.

Example 4

Example 4 differs from example 3 in that the heat source has a distance of 5 to 10mm, for example 6mm, from the surface as shown with reference to fig. 5. This distance is set so that the hot roller 410 having a relatively high temperature can form ironing effect on the surface of the plate 100 having a relatively high water content, thereby better improving the degree to which the flatness of the surface of the plate 100 can be improved in this step.

Example 5

Example 5 differs from example 1 in that the pre-curing step is performed under a negative pressure atmosphere, the leveling coating layer 210 is pre-cured in an expanded state, and the pre-cured paint film 220 in an expanded state is formed, and after the pre-curing step, the pre-cured paint film 220 is restored to its shape by a normal pressure buffering step.

In this embodiment, the pre-curing step is performed under a negative pressure environment, so that the leveling coating 210 can be expanded by negative pressure, and at least the outermost layer 221 of the leveling coating 210 can be stretched and leveled so that the outermost layer 221 is uniformly pre-cured without further leveling the surface of the sheet material 100.

Specifically, referring to fig. 6, the pre-curing step is performed in a negative pressure cartridge 500. The negative pressure cartridge 500 includes a cartridge body 510, a shutter 520 which allows the sheet material 100 to leave or enter the cartridge body 510, ultraviolet lamp groups 530 provided at the top of the cartridge body 510 at intervals, vacuum suction ports 540 provided at the top of the cartridge body 510 and located between adjacent two ultraviolet lamp groups 530, and a vacuum air pump connected to a pipeline controllable by the vacuum suction ports 540.

According to practical experience, it is not necessary to achieve a certain stable vacuum degree in the box 510, and only the vacuum air pump is required to work and maintain suction.

Example 6

Example 6 differs from example 5 in that the surface of the treated sheet material 100 was subjected to an archaizing router.

It will be apparent to those skilled in the art that the method of example 5 requires a higher cost than the treatment of example 3 or example 4. But has the advantages that the coating can be performed to form the matte paint film 230 for some archaizing process boards 100 with the concave-convex degree in the range of 0.2-0.3 mm, so that the archaizing process boards can have the archaizing and matte decorative effects.

Example 7

Example 7 differs from example 1 in that the step of leveling treatment as in example 3 was performed on the sheet while the step of pre-curing was performed under negative pressure as in example 5.

The coating methods of the matt paints of examples 1 to 7 coat the formed matt paint film performance parameters are shown in table 1. Wherein, the control group 1 is a paint film formed by the coating of the matt paint in the prior art; the control group 2 is archaized paint with the lowest luminosity which can be achieved in the prior art.

TABLE 1 coating method of the matt paints of examples 1 to 6 paint film properties of the matt paints formed by coating

Group of	Luminosity/°	Paint film hardness/H
			Example 1	3	4
Example 2	3	4
			Example 3	3	4
Example 4	4	4
			Example 5	4	4
Example 6	5	4
			Example 7	3	4
Control group 1	11	3
			Control group 2	18	2

The foregoing description is for purposes of illustration and is not intended to be limiting. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the subject matter of the disclosed application.

Claims

1. The coating method of the matte paint is characterized in that paint is coated on the surface of a plate to form a leveling coating through a paint coating step, then the leveling coating is pre-cured through a pre-curing step to form a pre-cured paint film, and the pre-cured paint film is cured through a curing step to form the matte paint film; wherein,,

2. The method of claim 1, wherein the single gas component is an inert gas.

3. The method of applying a matt finish according to claim 2, wherein the single gas component is nitrogen.

4. The method for coating a matt paint according to claim 2, characterized in that the nitrogen purity of the single gas component is 99.5-99.9%, and the aeration pressure is not less than 1.5MPa.

5. The method of applying a matt finish according to claim 1, wherein the paint application step is performed at a paint application rate of 20 to 50 g/square meter.

6. The method of applying a matt paint according to claim 1, wherein the step of applying the paint is preceded by a step of levelling to improve the flatness of the surface of the sheet material.

7. The method of applying a matt paint according to claim 6, wherein the leveling treatment step is a wetting treatment, a drying treatment and a sanding treatment to the surface of the board in this order.

8. The method of applying a matt paint according to claim 7, wherein the wetting treatment is the application of deionized water to the surface; the drying process heats the surface using a heat source to achieve drying, and the heat source has a distance of 5 to 10mm from the surface.

9. The method of applying a matt finish according to claim 1, wherein said step of pre-curing is carried out under negative pressure, said leveling coating being pre-cured in an expanded state, and said pre-cured paint film being formed in an expanded state.

10. The method of applying a matt paint according to claim 9, wherein between said pre-curing step and said curing step, said pre-cured paint film is brought back to its shape by a step of atmospheric buffering.