KR102123353B1 - Coating layer - Google Patents

Abstract

The present invention relates to a coating layer, in particular, the hydrophilic polymer layer and the distribution in the polymer layer includes particles of transition metal oxide, and the transition metal of the transition metal oxide is from the group consisting of Ti, Cu, Zn, Nb, Mo and W. It includes at least one selected.

Description

Coating layer {COATING LAYER}

The present invention relates to a coating layer, and more particularly, to a coating layer that decomposes odor-causing substances.

Microbes such as bacteria and fungi exist throughout life. In particular, the growth of bacteria and fungi may occur actively on surfaces exposed to a humid environment. As a result, bacteria and fungi multiply on the surface, and a substance that causes an unpleasant odor is generated.

To solve this problem, moisture can be removed immediately to prevent the growth of bacteria and fungi. However, it can be difficult to form an environment in which moisture is removed. For example, it may be difficult to remove moisture such as condensate formed on the surface of the heat exchanger generated by the operation of the heat exchanger, which is a core part of an air conditioner, refrigerator, and clothes dryer. In addition, there are also surfaces that are difficult to avoid the moisture environment, such as washing machines that are constantly exposed to moisture.

Accordingly, in order to remove unpleasant odors generated by bacteria and fungi, a masking technique that mixes fragrant substances and hides unpleasant odors is used. However, mixing different fragrances requires continuous input of a scented substance, and since the emotions that an individual feels about a scented substance are subjective, the effects that can be obtained through masking techniques are limited.

In addition, the masking technique has the disadvantage that it cannot remove unpleasant odors. Accordingly, the present invention proposes a coating layer capable of removing an unpleasant odor.

One object of the present invention is to propose a coating layer capable of removing odor-causing substances.

Another object of the present invention is to propose a coating layer that does not affect the performance of the product exposed to the moisture environment.

In order to achieve one object of the present invention, the coating layer according to the present invention includes a hydrophilic polymer layer and transition metal oxide particles distributed in the polymer layer, and the transition metal of the transition metal oxide is Ti, Cu, Zn, Nb, Mo and W include at least one selected from the group consisting of. The transition metal oxide may generate at least one selected from the group consisting of oxygen radicals and hydrogen oxide radicals capable of decomposing odor-causing substances by contact with moisture.

In Examples, in Examples, the average size of the transition metal oxide is 20 to 700 nm.

In an embodiment, the total content of the transition metal oxide is 0.1 to 5 wt% of the polymer layer.

In the embodiment, the hydrophilic polymer layer is polyvinyl alcohol (polyvinyl alcohol), polyoxyethylene glycol (polyoxyethylene glycol), polysulfonic acid (polysulfonic acid), polyacrylic acid (polyacrylic acid), polymethacrylic acid (polymethacrylic acid.) , It characterized in that it comprises at least one selected from the group consisting of polypropylene glycol (polypropylene glycol).

In an embodiment, the hydrophilic polymer layer is composed of polyvinyl alcohol, and further includes sulfur.

In an embodiment, the average thickness of the hydrophilic polymer layer is 700 to 2000 nm.

In an embodiment, the hydrophilic polymer layer further includes tin oxide formed to remove formaldehyde.

In an embodiment, the tin oxide is a precious metal catalyst selected from the group consisting of rhodium (rh), palladium (pd), silver (silver, Ag), platinum (platinum, Pt) and gold (gold, Au) It contains at least one.

According to the coating layer according to the present invention, odor-causing substances may be removed, including hydrophilic polymer layers and transition metal oxide particles. In detail, the retention time of moisture on the surface of the hydrophilic polymer layer is extended by the hydrophilic polymer layer, thereby making it easy to contact the transition metal oxide particles contained in the hydrophilic polymer layer with moisture. Accordingly, a large number of radicals capable of decomposing odor-causing substances are generated in the transition metal oxide particles, thereby effectively removing odor-causing substances.

In addition, the coating layer according to the present invention can provide a size of the hydrophilic polymer layer and the transition metal oxide particles to effectively remove odor-causing substances while minimizing the effect on the performance of the coated product.

1 is a conceptual diagram of a coating layer of an embodiment of the present invention.
2 is an image showing the characteristics of the transition metal oxide particles decompose odor-causing substances in the embodiments of the present invention.

Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, but the same or similar elements will be given the same reference numbers regardless of the reference numerals, and redundant descriptions thereof will be omitted. In addition, in describing the embodiments disclosed in this specification, detailed descriptions of related well-known technologies are omitted when it is determined that the gist of the embodiments disclosed herein may obscure the subject matter. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the specification is not limited by the accompanying drawings, and all modifications included in the spirit and technical scope of the present invention , It should be understood to include equivalents or substitutes.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, terms such as "comprises" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described in the specification, but one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

1 is a conceptual diagram of a coating layer 100 of one embodiment of the present invention.

The coating layer 100 of the present invention may include the hydrophilic polymer layer 10 and the transition metal oxide 11 particles distributed or dispersed in the hydrophilic polymer layer 10. The transition metal oxide 11 is dispersed in the hydrophilic polymer layer 10 and is present in the form of a filler or filler, and may be located anywhere on the interior and surface of the hydrophilic polymer layer 10.

In addition, the coating layer 100 may be present in a form that is laminated on the surface of the base material 20. Furthermore, the base material 20 may be a variety of products formed of an injection material. In one embodiment, the base material 20 may include a product that is exposed to a moisture-rich environment, such as an air conditioner, a refrigerator, and a heat exchanger, which is a key component of a clothes dryer, to generate or exist a substance that causes odor.

The coating layer 100 may remove odor-causing substances, and may be applied to products that operate in a moisture-rich environment to remove odor-causing substances. In detail, microorganisms such as bacteria and fungi can be easily propagated by condensate generated while the heat exchanger is operating on the surface of the heat exchanger. Accordingly, a substance that causes an odor such as a nitrogen compound generated by metabolism of bacteria and fungi may be generated, and a substance causing the odor may be removed by the coating layer 100.

In addition, the coating layer 100 may be disposed on a surface that is difficult to avoid the moisture environment, such as a washing machine that is constantly exposed to moisture, to remove substances that cause odor.

Furthermore, it is possible to remove odor-causing substances such as sulfide or aromatic and volatile organic compounds (VOCs) having a high degree of carbonization. The odor-causing substance is only exemplary, and the present invention is not limited thereto.

The hydrophilic polymer layer 10 may be formed of a hydrophilic polymer layer 10 capable of keeping moisture in the air or the surface of the coating layer 100 well in order to be formed to use moisture to decompose the odor-causing substance. Accordingly, the time for retaining moisture on the surface of the hydrophilic polymer layer 10 is extended, and thus the contact of the transition metal oxide 11 particles contained in the hydrophilic polymer layer 10 to be described later becomes easy. Accordingly, a number of radicals capable of decomposing the odor-causing substance are generated by contact of the particles of the transition metal oxide 11 with moisture, so that the odor-causing substance can be effectively removed.

The hydrophilic polymer layer 10 is polyvinyl alcohol, polyoxyethylene glycol, polysulfonic acid, polyacrylic acid, polymethacrylic acid, polypropylene glycol It may include at least one selected from the group consisting of (polypropylene glycol).

When the hydrophilic polymer layer 10 contains polyvinyl alcohol, a vulcanization process to include sulfur may be performed to form a coating layer 100 of a solid film.

Furthermore, the average thickness of the hydrophilic polymer layer 10 may be 700 to 2000 nm. When the average thickness of the hydrophilic polymer layer 10 is less than 700 nm, the transition metal oxide 11 is not sufficiently contained, and thus, a substance causing odor cannot be sufficiently removed. On the other hand, when the average thickness of the hydrophilic polymer layer 10 exceeds 2000 nm, the performance of the product may be deteriorated when applied to the surface of the product. For example, when the coating layer 100 is formed on the surface of the heat exchanger, heat exchange performance may deteriorate when the average thickness of the hydrophilic polymer layer 10 exceeds 2000 nm.

The transition metal of the transition metal oxide 11 is titanium (Ti), copper (copper, Cu), zinc (zinc, Zn), niobium (Nb), molybdenum (molybdenium, Mo) and tungsten ( tungsten, W).

The average size of the transition metal oxide 11 may be 20 to 700 nm. When the average size of the transition metal oxide 11 is less than 20 nm, the drainage property of the coating layer 100 may be deteriorated by the transition metal oxide 11. That is, when the average size of the transition metal oxide 11 is less than 20 nm, excessive moisture may adhere to the surface of the coating layer 100, and natural drainage may be difficult. When natural drainage is not achieved, bacteria or fungi propagate more easily than if not, and there is a disadvantage that odor generating substances may be formed in large quantities.

On the other hand, when the average size of the transition metal oxide 11 exceeds 700 nm, it becomes larger than the average thickness of the hydrophilic polymer layer 10 described above. Thus, it cannot be stably present in the hydrophilic polymer layer 10.

Specifically, by providing an average thickness of the hydrophilic polymer layer 10 optimized as a coating layer 100 capable of removing odor-causing substances and an average size of the transition metal oxide 11, it is optimized while performing the removal of odor-causing substances. A coating layer 100 having drainage property may be provided.

In addition, the coating layer 100 provides the thickness of the hydrophilic polymer layer 10 and the size of the transition metal oxide 11 particles to optimize the removal of odor-causing substances, while minimizing the effect on the performance of the coated product. .

In addition, the total content of the transition metal oxide 11 of the coating layer 100 may be 0.1 to 5 wt% of the hydrophilic polymer layer 10. When the total content of the transition metal oxide 11 is less than 0.1 wt% of the hydrophilic polymer layer 10, the concentration of the transition metal oxide 11 contained in the coating layer 100 is lowered, so that the removal of substances causing odor is effectively eliminated. Cannot be performed. On the other hand, when the total content of the transition metal oxide 11 exceeds 5 wt% of the hydrophilic polymer layer 10, it may cause peeling of the coating layer 100, and the hardness of the coating layer 100 is also lowered, resulting in abrasion resistance and scratch resistance. This can degrade.

In addition, the transition metal oxide 11 included in the coating layer 100 may contact with moisture to form radicals. Odor-causing substances may be decomposed by the high reactivity of the radical. In particular, the radical may include at least one selected from the group consisting of oxygen radicals and hydrogen oxide radicals.

That is, since the coating layer 100 includes particles of transition metal oxide 11 that generate radicals that decompose odor-causing substances in contact with moisture, odor-causing substances may be removed.

The odor-causing substance may be a nitrogen compound such as TMA (trimethylamine) or a sulfur compound (sulfide) that causes an unpleasant odor formed in the metabolism of microorganisms such as bacteria and fungi. In addition, the odor-causing substances may be aromatic and volatile organic compounds (VOCs) having a high degree of carbonization.

Hereinafter, a mechanism for removing the above-described odor-causing substances from the coating layer 100 of the present invention will be described in detail.

First, TMA, which causes unpleasant odors, can be formed in the metabolism of microorganisms such as bacteria and fungi. In particular, it can be mainly produced in an environment lacking oxygen such as fermentation or decay. In order to remove TMA, it is possible to neutralize TMA having basicity or to decompose it by oxidizing with TMAO (trimethylamine N-oxide) to remove odor.

In the coating layer 100, the transition metal oxide 11 promotes the reaction of [Formula 1] in which TMA is oxidized by oxygen radicals and hydrogen oxide radicals formed by contact with moisture, and TMA may be removed.

[Formula 1]

H ₃ O ⁺ and/or O ^·- and/or OH ^·- + (CH ₃ ) ₃ N → H ₂ O and/or H ⁺ + (CH ₃ ) ₃ NO

In addition, in order to remove the odor generated from the sulfur compound (sulfide), the odor can be removed by oxidizing sulfide with high reactivity of hydrogen peroxide (H ₂ O ₂ ). Specifically, as in the reaction of [Formula 2], hydrogen ions and oxygen radicals generated from hydrogen peroxide oxidize sulfides and sulfur compounds are decomposed to remove odor. Therefore, decomposition of the sulfur compound may be performed by oxygen radicals formed in the coating layer 100.

[Formula 2]

4H ₂ O ₂ + H ₂ S → H ₂ SO ₄ + 4H ₂ O

H⁺ + HS^- (1) H ₂ S (aq)

H ^{+ +} HS ^-

H⁺ + S^2- (2) HS ^-

H ⁺ + S ^2-

H₂S (g)(3) H ₂ S (aq)

H ₂ S (g)

H₂SO₄ +4H₂O(4) 2H ⁺ + S ^2- + 4H ₂ O ₂

H ₂ SO ₄ +4H ₂ O

Furthermore, aromatic and volatile organic compounds (VOCs) having a high degree of carbonization can be decomposed into low molecular substances by highly reactive oxygen radicals and hydrogen oxide radicals as shown in [Formula 3].

[Formula 3]

In addition, aldehydes may be generated while decomposition of the above-described odor-causing substances is performed, and aldehydes may also cause odors and irritate the mucous membranes and skin of the human body. Accordingly, the hydrophilic polymer layer 10 may further include a material formed to oxidize and remove the aldehyde with carbon dioxide and water.

In detail, tin oxide may be further included as a material capable of removing aldehydes. Furthermore, the tin oxide may include a precious metal catalyst. The noble metal catalyst may include at least one selected from the group consisting of rhodium (Rh), palladium (Pd), silver (Ag), platinum (Pt), and gold (Au). .

2 is an image showing the characteristics of the transition metal oxide particles decompose odor-causing substances in the embodiments of the present invention.

Hereinafter, an embodiment for confirming a property that the transition metal oxide particles of the present invention decomposes an odor-causing substance will be described.

<Example 1: Decomposition of odor-causing substances of ZnMoO ₄ particles>

An odor bag containing TMA, an odor-causing substance, was prepared to vaporize with 0.2 wt% ZnMo ₄ particles to form 14 ppm.

The odor bag is heated in the oven for a predetermined time to vaporize the TMA, and the concentration of the TMA is checked using a detection tube method over time.

According to (a) of FIG. 2, the concentration of TMA decreased to 0.8 ppm after 2 minutes, and the concentration of TMA decreased after 40 minutes, after the odor bag containing 0.2 wt% ZnMoO ₄ particles and 14 ppm TMA. (0.3 ppm).

<Example 2: Decomposition of odor-causing substances of MoO ₃ particles>

An odor bag containing TMA, an odor-causing substance, was prepared to vaporize with 0.2 wt% MoO ₃ particles to form 14 ppm.

The odor bag is heated in the oven for a predetermined time to vaporize the TMA, and the concentration of the TMA is checked using a detection tube method over time.

According to (b) of FIG. 2, the concentration of TMA was reduced to 2.7 ppm after 2 minutes, and the concentration of TMA was detected after 50 minutes, the odor bag containing 0.2 wt% MoO ₃ particles and 14 ppm TMA. (0.3 ppm).

<Comparative Example: Decomposition of odor-causing substances in hydrogen peroxide>

As a comparative example of the present invention, an odor bag containing TMA, which is an odor-causing substance, is prepared to be vaporized with 2.5 to 3.5 wt% H ₂ O ₂ capable of decomposing odor-causing substances to form 14 ppm.

The odor bag is heated in the oven for a predetermined time to vaporize the TMA, and the concentration of the TMA is checked using a detection tube method over time.

According to (c) of FIG. 2, the odor bag containing 2.5 to 3.5 wt% H ₂ O ₂ and 14 ppm of TMA did not effectively reduce the concentration of TMA to 14 ppm after 2 minutes. In addition, after 24 hours, it was shown that the concentration of TMA decreased to 5 ppm.

It can be seen that Example 1 and Example 2 of the present invention have excellent decomposition performance of odor-causing substances compared to hydrogen peroxide of the comparative example.

It will be apparent to those skilled in the art that the invention may be embodied in other specific forms without departing from the essential features of the invention.

In addition, the above detailed description should not be interpreted restrictively in all respects, but should be considered as illustrative. The scope of the invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (8)

Hydrophilic polymer layer; And
It includes the transition metal oxide particles distributed in the polymer layer,
The transition metal of the transition metal oxide includes at least one selected from the group consisting of Ti, Cu, Zn, Nb, Mo and W,
The transition metal oxide reacts with moisture to form a radical,
The radical reacts with the odor-causing substance to decompose the odor-causing substance. According to claim 1,
The average size of the transition metal oxide is a coating layer, characterized in that 20 to 700 nm. According to claim 1,
The total content of the transition metal oxide is a coating layer, characterized in that 0.1 to 5 wt% of the polymer layer. According to claim 1,
The hydrophilic polymer layer is polyvinyl alcohol, polyoxyethylene glycol, polysulfonic acid, polyacrylic acid, polymethacrylic acid, polypropylene glycol glycol) coating layer characterized in that it comprises at least one selected from the group consisting of. According to claim 1,
The hydrophilic polymer layer is composed of polyvinyl alcohol (polyvinyl alcohol), a coating layer characterized in that it further comprises a sulfur (sulfur). According to claim 1,
The average thickness of the hydrophilic polymer layer is a coating layer, characterized in that 700 to 2000 nm. According to claim 1,
The hydrophilic polymer layer is a coating layer characterized in that it further comprises a tin oxide formed to remove formaldehyde. The method of claim 7,
The tin oxide includes at least one precious metal catalyst selected from the group consisting of rhodium (rh), palladium (pd), silver (silver), platinum (platinum, platinum), and gold (au). Coating layer characterized in that.

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