KR20230120626A - A composition of a waterproof coating agent and method for waterproof coating using the same - Google Patents

Abstract

An embodiment of the present invention provides a technology for imparting high-grade waterproof characteristics to outdoor electronic products such as smart watches and electronic components such as speakers included in such electronic products. The waterproof coating composition according to an embodiment of the present invention includes 5 to 15 wt% of nanoparticles formed of silicon oxide, 10 to 20 wt% of a polymer material, and 65 to 85 wt% of an organic solvent.

Description

Waterproof coating composition and waterproof coating method using the same {A COMPOSITION OF A WATERPROOF COATING AGENT AND METHOD FOR WATERPROOF COATING USING THE SAME}

The present invention relates to a waterproof coating composition and a waterproof coating method using the same, and more particularly, to outdoor electronic products such as smart watches and electronic components such as speakers included in such electronic products. 8 or more) relates to a technology for imparting waterproof characteristics.

Electronic parts of electronic products include printed circuit boards (PCBs) in which components such as elements are connected with circuits and other components connected to the printed circuit boards, and since they are based on conductive circuits, when in contact with water It can be said that there is a high risk of damage due to a short circuit.

Accordingly, interest in technologies for improving durability and extending lifespan by forming a coating film on electronic components to give functions such as waterproofing is increasing. In particular, in the case of existing electronic products for outdoor use, waterproofing treatment is the most It was an important issue. For such waterproof treatment, there is a problem in that the design of the existing electronic product must be renewed in accordance with the implementation of the waterproof function, considering the waterproof treatment from the design of the electronic product.

However, as described above, when the design of an existing electronic product is renewed, the smooth use of the existing product for outdoor use may be limited and additional costs may be incurred. In order to solve this problem, various waterproof coating solutions have been recently developed, but due to the nature of electronic products, they must have long-term durability and high stability. It is important, however, that recently released waterproof coatings have a very low waterproof rating and a very low long-term stability.

Republic of Korea Patent Registration No. 10-1942796 (Title of Invention: Method for coating a device and device having a nanofilm thereon, hereinafter referred to as Prior Art 1), a printed circuit board and one disposed on the printed circuit board A printed circuit board assembly having the above electronic components, and a nanofilm disposed on the printed circuit board assembly, wherein the nanofilm is an inner coating in contact with the printed circuit board assembly (the inner coating has a thickness of 5 nm to 100 nm). including metal oxide nanoparticles having a particle diameter within the range of; and an outer coating in contact with the inner coating, the outer coating comprising silicon dioxide nanoparticles having a particle diameter in the range of 0.1 nm to 10 nm.

In addition, in Republic of Korea Patent Publication No. 10-2019-0134800 (title of invention: cyclic high duty cycle pulse discharge multifunctional nano protective coating layer manufacturing method, hereinafter referred to as prior art 2), a reaction chamber is vacuum pumped and an inert gas Injecting to generate motion of the substrate, injecting monomer vapor into the reaction chamber to proceed with chemical vapor deposition, the deposition process includes a pretreatment step and a coating step, the plasma discharge method of the pretreatment step is a high power continuous discharge, and the coating film The plasma discharge method of the step is a high duty cycle pulse discharge, and the pretreatment step and the coating step are cyclically overlapped at least once, and more active sites are introduced to the surface of the substrate due to circulation retraction in the coating process process, thereby increasing the effective coating film. A method for manufacturing a protective coating layer is disclosed.

And, in Republic of Korea Patent Publication No. 10-2018-0051236 (title of invention: method for producing a super-water-repellent coating solution for waterproofing and dust-proofing of electronic devices and electronic parts, hereinafter referred to as prior art 3), a super-water-repellent coating agent and preparing a coating solution by mixing the prepared super water-repellent coating agent with a perfluorinated compound, wherein the perfluorinated compound is a fluorinated ketone (Perfluoroketone), methylperfluor, including an iso compound A method for preparing a super-water-repellent coating solution selected from methyl fluorobutyl ether is disclosed.

In each of the prior arts described above, in prior art 1, a waterproof coating layer and a nanofilm are separately formed to form a plurality of separate coating layers, and in prior art 2, a carbon resin material is used as nanoparticles to form such a coating layer. Since the nanoparticles are directly deposited on the surface of the PCB board to form the nano-coating layer, the prior arts 1 and 2 have problems in that the process is complicated and the cost increases. And, in prior art 3, since a waterproof coating agent is formed using an existing compound in which a perfluoro compound is mixed with a coating agent formed of an existing super-water-repellent material, there is a limit in waterproof performance and carcinogen perfluor compound, etc. There is a problem such as that there may be restrictions on use due to use.

Republic of Korea Patent No. 10-1942796 Republic of Korea Patent Publication No. 10-2019-0134800 Republic of Korea Patent Publication No. 10-2018-0051236 Republic of Korea Patent No. 10-1136391 Republic of Korea Patent No. 10-0854486 Republic of Korea Patent No. 10-2173034 Republic of Korea Patent Publication No. 10-2020-0077234

An object of the present invention to solve the above problems is to impart high-grade waterproof characteristics to outdoor electronic products such as smart watches and electronic components such as speakers included in such electronic products.

And, an object of the present invention is to increase the bonding force between the electronic product and the coating layer and to minimize the reactivity between the coating layer and water.

The technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

The configuration of the present invention for achieving the above object includes 5 to 15 wt% of nanoparticles formed of silicon oxide, 10 to 20 wt% of a polymer material, and 65 to 85 wt% of an organic solvent.

In an embodiment of the present invention, the silicon oxide may be formed of one or more materials selected from the group consisting of SiOF, TiOF, and ZnOF.

In an embodiment of the present invention, the polymer material may be formed of one or more materials selected from the group consisting of PDMS, H-PDMS, ecoflex, dragon skin, and Durasurf.

In an embodiment of the present invention, the organic solvent may be formed of one or more materials selected from the group consisting of hexane, toluene, THF, CM, DCM, and xylene.

The configuration of the present invention for achieving the above object is a first step of preparing a coating target that can be applied with electricity and is a coating target; A second step of preparing a waterproof coating composition comprising 5 to 15 wt% of nanoparticles formed of silicon oxide, 10 to 20 wt% of a polymer material, and 65 to 85 wt% of an organic solvent; A third step of applying the waterproof coating composition to the surface of the coating target to form a waterproof coating layer; and a fourth step of curing the waterproof coating layer.

In an embodiment of the present invention, in the third step, the thickness of the waterproof coating layer may be adjusted by controlling the viscosity or application amount of the waterproof coating composition.

In an embodiment of the present invention, the thickness of the waterproof coating layer may be 0.1 to 1 millimeter (mm).

In an embodiment of the present invention, the viscosity of the waterproof coating composition may be 1 to 5,000 cPs (Poise).

In an embodiment of the present invention, in the third step, spray coating, drop-coating, or deep-coating the waterproof coating composition on the surface of the coating object is performed to The waterproof coating layer may be formed.

The effect of the present invention according to the configuration as described above is that a transparent waterproof coating layer is formed on the surface of the electronic component, so that it is easy to check the state of the electronic component, and it is easy to implement a high-grade waterproof property using nanoparticles.

And, the effect of the present invention is that it is easy to install waterproof coated electronic components without increasing a separate installation space due to the relatively thin thickness of the waterproof coating layer.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 and 2 are images of a conventional coating layer for waterproofing and a waterproof coating layer according to an embodiment of the present invention.
3 is a table related to an operation experiment for an embodiment and a comparative example of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms, and therefore is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this is not only "directly connected", but also "indirectly connected" with another member in between. "Including cases where In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The waterproof coating composition of the present invention includes 5 to 15 wt% of nanoparticles formed of silicon oxide, 10 to 20 wt% of a polymer material, and 65 to 85 wt% of an organic solvent.

The silicon oxide may be formed of one or more materials selected from the group consisting of materials having an F group attached to the surface of a metal oxide, such as fluorine doped silicon oxide (SiOF), TiOF, and ZnOF.

The polymer material may be formed of one or more materials selected from the group consisting of PDMS, H-PDMS, ecoflex, dragon skin, and Durasurf.

The organic solvent may be formed of at least one material selected from the group consisting of hexane, toluene, tetrahydrofuran (THF), chloromethane (CM), dichloromethane (DCM), and xylene.

In the composition ratio of the waterproof coating composition of the present invention as described above, when the ratio of nanoparticles is less than 5 wt%, the amount of nanoparticles having a low surface energy is too small, thereby reducing the efficiency of reducing the reactivity of the waterproof coating layer and water. there is. And, when the ratio of the nanoparticles in the waterproof coating composition of the present invention is more than 15 wt%, the viscosity of the waterproof coating composition of the present invention is excessively low, and it may not be easy to form the thickness of the waterproof coating layer.

And, if the ratio of the polymer material is less than 10 wt%, the adhesive strength by the polymer material may decrease, and thus the bonding strength between the waterproof coating layer and the coating target may decrease. And, when the ratio of the polymer material exceeds 20 wt%, the viscosity of the waterproof coating composition of the present invention increases and the thickness of the waterproof coating layer increases, such as spray coating using the waterproof coating composition of the present invention. It is not easy to do and the opacity of the waterproof coating layer may increase.

Hereinafter, a waterproof coating method using the waterproof coating composition of the present invention will be described.

In the first step, it is possible to apply electricity and prepare a coating target to be coated. Here, the coating target may be an electronic component installed in an electronic product, such as a printed circuit board (PCB), a speaker, or the like, or a case of an electronic product. However, the coating target is not limited thereto, and all devices requiring waterproof coating may be coated.

In the second step, a waterproof coating composition containing 5 to 15 wt% of nanoparticles formed of silicon oxide, 10 to 20 wt% of a polymer material, and 65 to 85 wt% of an organic solvent may be prepared. Here, a waterproof coating composition may be formed by mixing each material into one mixture.

In the third step, a waterproof coating layer may be formed by applying the waterproof coating composition to the surface of the coating target. Here, the waterproof coating layer may be formed by using various methods such as spray coating, drop-coating, and deep-coating with the waterproof coating composition on the surface of the coating target. Here, the waterproof coating layer may be formed by using one coating method or a mixture of two or more coating methods.

Due to the relatively high viscosity of the prior art waterproof coating agent, the coating is performed by dipping the coating object in the prior art waterproof coating agent and then taking it out and drying it, thereby reducing work efficiency, forming a relatively thick coating layer, and making the coating layer opaque. There was a problem.

On the other hand, in the case of using the waterproof coating composition of the present invention, since the waterproof coating composition of the present invention can be applied to the surface of the coating target by spray coating due to its relatively low viscosity, the thickness of the waterproof coating layer is formed relatively thin and the waterproof coating layer This transparently formed effect is possible.

In addition, the thickness of the waterproof coating layer may be adjusted by controlling the viscosity or application amount of the waterproof coating composition. Specifically, the thickness of the waterproof coating layer may be increased while increasing the coating amount of the waterproof coating composition having relatively increased viscosity, and the thickness of the waterproof coating layer may be reduced while reducing the coating amount of the waterproof coating composition having relatively reduced viscosity. .

However, the thickness of the waterproof coating layer may be adjusted while reducing the coating amount of the waterproof coating composition having relatively increased viscosity, or the thickness of the waterproof coating layer may be adjusted while increasing the coating amount of the waterproof coating composition having relatively reduced viscosity.

Since the thickness of the waterproof coating layer can be adjusted as described above, the thickness of the waterproof coating layer can be adjusted according to the purpose or design of the coating target. The viscosity of the waterproof coating composition can be controlled by adjusting the ratio of the nanoparticles or polymer materials.

Here, the viscosity of the waterproof coating composition may be 1 to 5,000 cPs (poise). By adjusting the nanoparticles and the polymer material as described above, the waterproof coating composition may have the above-described viscosity range, and accordingly, the thickness of the waterproof coating layer may be adjusted by controlling the viscosity of the waterproof coating composition as described above.

As such, the thickness of the waterproof coating layer of the present invention may be formed relatively thin, and the thickness of the waterproof coating layer may be 0.1 to 1 millimeter (mm).

When the thickness of the waterproof coating layer is less than 0.1 millimeter (mm), the thickness of the waterproof coating layer is too small and durability of the waterproof coating layer may decrease. And, when the thickness of the waterproof coating layer exceeds 1 millimeter (mm), the transparency of the waterproof coating layer is lowered and the installation space of the coating target may increase due to the increase in the volume of the coating target.

In the fourth step, the waterproof coating layer may be cured. The time for curing the waterproof coating layer may be 5 to 10 minutes (min) at room temperature and less than 5 minutes (min) at 60°C. Specifically, the waterproof coating layer of the present invention may be cured within 10 minutes (min) at a temperature of 20 to 60 ° C.

As described above, since the waterproof coating composition of the present invention has a relatively low viscosity, and it is possible to form a waterproof coating layer having a relatively thin thickness by performing the coating by a spray coating method, the waterproof coating layer of the present invention has a temperature as described above. It can be cured quickly in the range.

A PCB substrate including a waterproof coating layer formed by the waterproof coating method of the present invention as described above can be manufactured. The PCB substrate formed in this way is easy to check the condition of the PCB substrate during use due to the formation of a transparent waterproof coating layer, and the PCB substrate can be easily installed without increasing a separate installation space due to the relatively thin thickness of the waterproof coating layer.

And, in the PCB substrate, a waterproof coating layer may be formed on the front surface, the rear surface, or both the front surface and the rear surface. That is, a waterproof coating layer may be selectively formed on the front or rear surface, or a waterproof coating layer may be formed on both the front and rear surfaces. In the prior art of immersing a PCB substrate in a coating agent and then taking it out, it was not easy to selectively coat one side of a coating target such as a PCB substrate, but the waterproof coating layer of the present invention can be selectively formed on one side of the coating target as described above. Accordingly, the coating surface can be selected according to the purpose or design of the coating target.

Hereinafter, examples, comparative examples, and experimental examples will be described.

[Comparative Example 1]

A predetermined PCB substrate and a speaker connectable thereto were prepared, and no coating was performed.

[Comparative Example 2]

NanoProof PCB Waterproofing IPX7 Webinar (waterproof grade IPX 7), a waterproofing agent for PCB coating by Aculon, USA, was prepared, and a predetermined PCB substrate (1) and a speaker (2) connectable to it were prepared. Then, each of the PCB substrate (1) and the speaker (2) was immersed in the above-mentioned Aculon's PCB coating waterproofing agent, taken out (dip-coating) to form each waterproof coating layer, and left at room temperature for 2 hours. Thus, curing of the waterproof coating layer was performed.

[Example]

A waterproof coating composition consisting of 10 wt% of SiOF nanoparticles, 15 wt% of PDMS, and 75 wt% of hexane was prepared, and a predetermined PCB substrate 10 and a speaker 20 connectable thereto were prepared. . In addition, a waterproof coating composition is coated on the front and rear surfaces of the PCB substrate 10 and the front and rear surfaces of the speaker 20 by a spray coating method to form respective waterproof coating layers, and left at room temperature for 10 minutes. Thus, curing of the waterproof coating layer was performed.

1 and 2 are images of a conventional coating layer for waterproofing and a waterproof coating layer according to an embodiment of the present invention. Specifically, (a) of FIG. 1 is an image of the front surface of the PCB substrate 1 and the speaker 2 of [Comparative Example 2], and (b) of FIG. 1 is an image of the PCB substrate 1 of [Comparative Example 2]. ) and the image of the back of the speaker (2).

In addition, (a) of FIG. 2 is an image of the front surface of the PCB substrate 10 and the speaker 20 of the [embodiment], and (b) of FIG. 2 is the PCB substrate 10 and the speaker of the [embodiment]. This is an image of the back of (20).

As shown in the comparison of FIGS. 1 and 2, in the case of forming a waterproof coating layer using the waterproof coating composition of the present invention, compared to the case of forming a waterproof coating layer on the surface of a PCB substrate using a conventional PCB waterproof agent. , it can be confirmed that the thickness of the waterproof coating layer is formed relatively thin, so that the waterproof coating layer is formed transparently.

However, the thickness of the waterproof coating layer of the present invention can be both relatively thin and thick, and the thickness of the waterproof coating layer is controlled by controlling the application time and the viscosity of the waterproof coating composition of the present invention in the third step described above. can be implemented.

3 is a table related to an operation experiment for an embodiment and a comparative example of the present invention. In FIG. 3, the bare PCB may represent the PCB substrate of [Comparative Example 1], and the bare speaker may represent the speaker of [Comparative Example 1]. In addition, the coating material A PCB may represent the PCB substrate 1 coated by [Comparative Example 2], and the coating material A speaker may represent the speaker 2 coated by [Comparative Example 2]. In addition, the coating material B PCB may represent the PCB substrate 10 coated by [Example], and the coating material B speaker may represent the speaker 20 coated by [Example].

[Experiment example]

For each of the bare PCB and bare speaker, before soaking in water (expressed as before coating), immediately after soaking in water, after drying after heat treatment (30 minutes at 60℃), and after long-term drying (after drying for heat treatment, drying at room temperature for 72 hours), each case energization was measured.

For each of coating material A PCB, coating material A speaker, coating material B PCB, and coating material B speaker, before and after coating, immediately after soaking in water, after heat treatment and drying (60℃ for 30 minutes), after long-term drying (at room temperature after heat treatment and drying) Drying for 72 hours) In each case, whether or not electricity was applied was measured.

As shown in FIG. 3, in the case of a bare PCB, it can be confirmed that it is inoperable due to a short circuit in the energization test immediately after being immersed in water and after heat treatment and drying. However, it can be confirmed that the bare speaker is energized and operable in all cases. In addition, in the case of the coating material A PCB, it can be confirmed that it is inoperable due to a power failure in the energization test after long-term drying. However, it can be confirmed that the coating material A speaker is energized and operable in all cases. In addition, it can be confirmed that each of the coating material B PCB and the coating material B speaker is energized and operable in all cases.

From the above results, it can be confirmed that a waterproof coating layer having a waterproof function of a high grade (IPX 7-8) is required for electronic components such as a printed circuit board (PCB), and also, the waterproof coating composition of the present invention In the case of using the waterproof coating layer of the present invention, it can be confirmed that the waterproof performance is superior to that of the prior art waterproofing agent. And, it can be confirmed that the waterproof coating layer of the present invention is relatively transparent, so that it is easy to check the configuration of the printed circuit board (PCB).

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

1, 10: PCB board
2, 20: Speaker

Claims (13)

A waterproof coating composition comprising 5 to 15 wt% of nanoparticles formed of silicon oxide, 10 to 20 wt% of a polymer material, and 65 to 85 wt% of an organic solvent.
The method of claim 1,
The silicon oxide is a waterproof coating composition, characterized in that formed of one or more materials selected from the group consisting of SiOF, TiOF, and ZnOF.
The method of claim 1,
The polymer material is a waterproof coating composition, characterized in that formed of one or more materials selected from the group consisting of PDMS, H-PDMS, ecoflex, Dragon skin and Durasurf.
The method of claim 1,
The organic solvent is a waterproof coating composition, characterized in that formed of one or more materials selected from the group consisting of hexane, toluene, THF, CM, DCM and xylene.
In the waterproof coating method using the waterproof coating composition of claim 1,
A first step of preparing a coating target to which electricity can be applied and to be coated;
A second step of preparing a waterproof coating composition comprising 5 to 15 wt% of nanoparticles formed of silicon oxide, 10 to 20 wt% of a polymer material, and 65 to 85 wt% of an organic solvent;
A third step of applying the waterproof coating composition to the surface of the coating target to form a waterproof coating layer; and
A fourth step of curing the waterproof coating layer; waterproof coating method comprising a.
The method of claim 5,
In the third step, the waterproof coating method characterized in that the thickness of the waterproof coating layer is adjusted by controlling the viscosity or application amount of the waterproof coating composition.
The method of claim 6,
The waterproof coating method, characterized in that the thickness of the waterproof coating layer is 0.1 to 1 millimeter (mm).
The method of claim 6,
Waterproof coating method, characterized in that the viscosity of the waterproof coating composition is 1 to 5,000 cPs (Poise).
The method of claim 5,
In the third step, the waterproof coating layer is formed by spray coating, drop-coating, or deep-coating the waterproof coating composition on the surface of the coating object. waterproof coating method.
The method of claim 5,
In the fourth step, the curing temperature of the waterproof coating layer is 20 to 60 ℃, characterized in that the waterproof coating method.
The method of claim 10,
In the fourth step, the curing time of the waterproof coating layer is 5 to 10 minutes (min), characterized in that the waterproof coating method.
A PCB substrate comprising the waterproof coating layer formed by the method according to any one of claims 5 to 11.
The method of claim 12,
The PCB substrate, characterized in that the waterproof coating layer is formed on the front surface, the rear surface or both the front and rear surfaces.