KR102428140B1 - Deodorizing filter coating composition for air cleaners and deodorizing filter using the same - Google Patents

Abstract

The present invention relates to a coating composition for an air purifier deodorizing filter comprising persimmon extract, amino alcohol, or a mixture thereof as an active ingredient, and a deodorizing filter to which the same is applied. According to the present invention, it has excellent removal performance for five representative harmful gases (toluene, ammonia, acetic acid, acetaldehyde and formaldehyde), so it is effective in removing odors, and has an antiviral effect to inactivate viruses. It can reduce the contagiousness of viruses such as COVID-19 or influenza that spread through

Description

A coating composition for an air cleaner deodorizing filter and a deodorizing filter applying the same

The present invention relates to a coating composition for an air purifier deodorizing filter comprising persimmon extract or amino alcohol or a mixture thereof as an active ingredient, and a deodorizing filter to which the same is applied, and more particularly, to toluene, ammonia, acetic acid, acetaldehyde and formaldehyde. The present invention relates to a coating composition for a deodorizing filter having excellent removal performance and effective odor removal and antiviral effect, and a filter to which the same is applied.

In general, in the air conditioning system of indoor air purifiers, air conditioners, and vehicle air purifiers, the dust collection filter (pre-filter-medium filter-hepa filter) is used firstly to remove dust, and secondly, gases and odorous compounds contained in the air, etc. Activated carbon filters and catalytic filters are used to remove them.

Examples of odor substances to be removed include nitrogen compounds such as ammonia and amines; sulfur compounds such as hydrogen sulfide and alkylthiols; aldehyde compounds such as formaldehyde, acetaldehyde, propionaldehyde, butylaldehyde, pentanaldehyde, hexanal, and nonenal; organic acids such as formic acid, acetic acid, propionic acid, butyric acid, and valeric acid; And it is distinguished as a volatile organic compound having a neutral odor, such as toluene, xylene, and ethyl acetate.

As a performance standard for air purifiers sold in Korea, the domestic air cleaning association has to have the performance to remove more than 70% of each 10 ppm gas of toluene, ammonia, acetic acid, acetaldehyde and formaldehyde in 30 minutes. acknowledging its effectiveness.

In general, deodorizing filters for air purifiers include a method in which particulate activated carbon is put in a frame of a certain size and used as a filter, a method made by attaching fine activated carbon particles to a paper filter assembled in a honeycomb shape, and a fiber or plastic coated with a deodorant, etc. There is a method made of a mesh, and the pressure loss is not large, and at the same time, the deodorization efficiency has been designed to be improved.

The deodorizing filter for domestic air purifiers is characterized in that it uses activated carbon containing chemicals such as inorganic acids and amine compounds in advance, that is, it is attached to the activated carbon, in order to satisfy the removal rate of the five gases selected by the domestic air cleaning association. .

Specifically, a method of removing volatility by applying urea, an aromatic amine, an extract of yellow lotus, etc. to the activated carbon to make aldehydes primary imine, RHC = NR' to increase molecular weight has been attempted. However, these amine compounds presented so far have poor removal efficiency to remove formaldehyde or acetaldehyde with low molecular weight, or use of water-insoluble aromatic or urea-based amines. In particular, when an aromatic amine or hydrazine derivative is used for aldehyde removal, the removal efficiency of acetaldehyde is poor due to the steric hindrance effect of the methyl group of acetaldehyde and the aromatic or hydrazine derivative, so improvement is required.

In addition, recently, in order to lower the risk of air infection due to viruses such as Corona 19, the need for antiviral function in the deodorizing filter has increased to prevent re-spreading of the virus on the filter or infection during the filter replacement process. For this purpose, a coating solution with antiviral treatment with natural extracts such as ginkgo extract has been developed, and paper, activated carbon, and zeolite filters coated with natural extracts with antiviral performance are also being devised. However, in the case of filters with these various functions, most of them do not satisfy the performance standards for the five major gases of the domestic air cleaning association.

Moreover, in the case of China, which is the largest consumer of air purifiers, national standards set the standards as formaldehyde treatment amount and treatment efficiency, but there are few cases of air purifiers that can simultaneously achieve these standards. Therefore, there is an urgent need to develop an air purifier that can satisfy not only Korea's five major gas standards but also China's formaldehyde treatment standards.

Accordingly, the present inventors have confirmed the performance of a deodorizing filter that can satisfy the air purifier standards of China as well as Korea, and have completed the present invention.

Domestic registered patent 10-1337207 Japanese Patent Application Laid-Open No. 2010-096418

Therefore, the main object of the present invention is to have excellent removal performance for five harmful gases (toluene, ammonia, acetic acid, acetaldehyde and formaldehyde), and in particular, a coating composition for an air purifier deodorizing filter with enhanced treatment efficiency for formaldehyde, and To provide a deodorizing filter to which this is applied.

In order to achieve the above object, in one embodiment, the present invention provides a coating composition for a deodorizing filter comprising a persimmon extract as an active ingredient.

In another embodiment, the present invention provides a coating composition for a deodorizing filter comprising amino alcohol as an active ingredient.

In another embodiment, the present invention provides a coating composition for a deodorizing filter comprising a persimmon extract and amino alcohol as active ingredients.

In addition, the present invention provides a deodorizing filter manufactured by applying the composition.

According to the present invention, it has excellent removal performance for five representative harmful gases (toluene, ammonia, acetic acid, acetaldehyde and formaldehyde), and thus has effective odor removal performance. In particular, it is possible to enter the Chinese market, where air purifiers are in high demand, by strengthening the treatment efficiency of formaldehyde among the harmful gases to meet the performance standards of air purifiers in China as well as Korea.

In addition, it has an antiviral effect that inactivates the virus, so it can reduce the contagious power of viruses such as COVID-19 or influenza, which are rapidly spreading through indoor air recently.

1 is a flowchart illustrating a manufacturing process of an air purifier deodorizing filter according to an embodiment of the present invention.
Figure 2 is a graph showing the time-to-gas removal performance of the deodorizing filter coated with the composition prepared according to Example 3 of the present invention.
3 is a graph showing the results of the deodorization filter applied with the composition prepared according to Example 4 of the present invention, gas removal performance versus time.
FIG. 4 is a graph showing the time-varying gas removal performance of the deodorizing filter coated with the composition prepared according to Example 9 of the present invention.
5 is a result graph showing the gas removal performance of the deodorizing filter coated with the composition prepared according to Comparative Example 2 of the present invention by the number of times of formaldehyde input.
6 is a result graph showing the gas removal performance of the deodorizing filter coated with the composition prepared according to Example 6 of the present invention by the number of times of formaldehyde input.
7 is a result graph showing the gas removal performance of the deodorizing filter composed of activated carbon without application of the composition according to Comparative Example 1 of the present invention by the number of times of formaldehyde input.

Hereinafter, the present invention will be described in more detail to help the understanding of the present invention. At this time, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor appropriately defines the concept of the term in order to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

Hereinafter, the present invention will be described in detail.

The present invention is to provide a coating composition for a deodorizing filter comprising persimmon extract or amino alcohol or a mixture thereof as an active ingredient, and research has been completed so that it can be used as a deodorizing filter of an air purifier that has odor removal and antiviral effects.

Since ancient times, it has been said that astringent persimmon removes bad odors. And the astringent component of astringent persimmon has the effect of reducing acetaldehyde (Taira, S. 1996. Astringency in persimmon In: H. F. Linskens and J. F. Jackson(eds.). Modern methods of plant analysis. Vol. 18. Fruit analysis. Springer- Verlag, Berlin, pp. n97-110.; A study on new factors and astringent properties related to astringent persimmon, 1999, Kyoto University, Japan), which shows that abundant water-soluble tannins in persimmon filter acetaldehyde or This is because it can reduce the concentration of acetaldehyde by combining with it. In addition, it has already been known in international patents that textile products coated with persimmon juice have an antiviral effect.

Therefore, in the present invention, by preparing a coating composition containing an aqueous solution of astringent persimmon, that is, persimmon extract as an active ingredient, and spraying it on a filter to produce a deodorizing filter, the air purifier to which the deodorizing filter is applied is effective against acetaldehyde. High removal performance and antiviral effect can be expected.

On the other hand, in China, building materials that emit a lot of formaldehyde, the cause of sick house syndrome, are used.

Since formaldehyde is one of the gases specified as a material to be removed by the Korean Air Cleaning Association, removal performance above a certain level is required in Korea as well. However, even if the removal performance meets the domestic standards, it needs to be further improved to satisfy the Chinese standards.

As the formaldehyde removal method, as shown in the following formula (1), an amine compound and formaldehyde are reacted to form an imine having a large molecular weight and lowered the volatility to prevent the aldehyde from scattering. How to remove formaldehyde. In addition, there is a method of converting formaldehyde into water and carbon dioxide as shown in Equation (2) below using an oxidizing agent such as cerium oxide and KMnO ₄ .

(1) Combination of formaldehyde with an amine compound

R-NH ₂ + H ₂ CO → RN=CH ₂ (non-volatile) + H ₂ O

(R: The larger the molecule, the lower the acetaldehyde removal performance)

(2) Oxidation reaction of formaldehyde using metal oxidation catalyst and oxygen

MO + H ₂ CO → H ₂ O + CO ₂

More specifically, the formula (1) is expressed as the following formula (3).

(3)

Referring to Formula (3), it is a method of removing formaldehyde by applying various organic compounds to the G portion of the primary amine (H ₂ NG).

By applying urea (urea) to the G portion, acetaldehyde and formaldehyde can be removed as shown in the following formula (4).

(4)

However, when aromatic or urea (urea) is applied to the G part, the melting point of the primary amine increases or the solubility in water decreases, so that the filter remains as a powder after drying of the filter or these amines are scattered, so that the filter It may cause its own odor, so improvement is required.

In addition, acetaldehyde always exists in a form having a carbonyl group (C=O) in an aqueous solution (keto form) and an alcohol group (-OH), and reacts with a primary amine as shown in the following formula (5) This is only possible with the keto type.

(5)

Therefore, in order to remove acetaldehyde as a primary amine, the removal efficiency is not good. Therefore, in order to increase the ratio of the keto form, the removal efficiency of acetaldehyde can be improved by appropriately adjusting the pH of the aqueous solution in which the aldehyde is dissolved to be weakly acidic, neutral or basic.

In addition, when general amine compounds remain solid on the filter surface after drying the filter and are scattered by wind, the minimum detectable concentration of amines is very low, so odor claims may occur when attached to an air purifier. As a result, an amine that is liquid at room temperature was selected and an amine that was completely mixed with water was used to solve the conventional problem.

Accordingly, in the present invention, the minimum detection concentration is increased by introducing an alcohol group into the chain of the alkylamine while having a primary amine group, and a material having a high boiling point is introduced to eliminate the amine smell of the existing filter.

In addition, in the case of the oxidation reaction as in Formula (2), there is a problem in that the reaction efficiency is low at room temperature, so that the formaldehyde cannot be sufficiently removed. Therefore, in order to manufacture a deodorizing filter that has to process a large amount of formaldehyde, that is, the throughput and treatment efficiency are improved, the present invention is designed to increase the amount of formaldehyde treated by increasing the reactivity of the primary amine group rather than the oxidizing agent.

Hereinafter, the coating composition for a deodorizing filter according to the present invention will be described.

As described above, the abundant water-soluble tannins in persimmon filter or combine acetaldehyde to reduce the concentration of acetaldehyde, and also have an antiviral effect. Accordingly, in one embodiment of the present invention, the coating composition for a deodorizing filter is characterized in that it comprises a persimmon extract as an active ingredient.

The persimmon extract may be extracted with one or more solvents selected from the group consisting of water, methanol, ethanol and propanol, but is not limited thereto. Preferably, water-soluble tannins and polyphenols can be obtained with high efficiency by extraction with an aqueous ethanol solution. More preferably, extraction with an aqueous solution of 10 to 30% ethanol is effective.

The persimmon extract obtained by the above method is preferably subjected to a process of removing the odor component remaining in the persimmon extract before use. This is because the smell of persimmon remaining in the persimmon extract may act as the smell of the deodorizing filter. The main cause of the odor component is the low molecular weight alcohol or aldehyde remaining in the persimmon extract, and the deodorizing effect can be expected by pre-treating the low molecular weight odor substance with zeolite or activated carbon. In one embodiment of the present invention, the persimmon extract is impregnated at room temperature with at least one component selected from the group consisting of zeolite, activated carbon, bentonite, and mixtures thereof, or heat-treated at a temperature of 50 to 80 ℃ persimmon Odor components present in the extract can be removed.

The composition may include the persimmon extract diluted to 1 to 10% by volume. In addition, the composition includes at least one inorganic acid selected from the group consisting of phosphoric acid, hydrochloric acid and formic acid, aromatic amines, and inorganic salts such as potassium iodide (KI) together with the persimmon extract in order to improve the removal performance of specific components in the air. Alternatively, it may further include a base such as potassium hydroxide (KOH).

On the other hand, in another embodiment of the present invention, the coating composition for a deodorizing filter is characterized in that it contains amino alcohol as an active ingredient.

In the present invention, as described above, an amine that is liquid at room temperature is selected as the primary amine and an amine that is completely mixed with water is used to solve the conventional problem. In particular, when the amine compound remains as a solid on the filter surface after drying and is scattered by wind, the minimum detectable concentration of the amine is very low, so odor claims may occur when attached to the air purifier. By introducing an alcohol group into the chain, the minimum detectable concentration is increased, and the amine odor of the filter can be eliminated by using a liquid having a high boiling point as the primary one.

The amino alcohol is, for example, aminoethanol, amino-2-propanol, 3-amino-1-propanol, 2-amino-1-propanol, amino-1,2-propanediol, 2-amino-1,3- It may be at least one selected from the group consisting of propanediol (serinol) and 1,3-diamino-2-propanol, but is not limited thereto.

The composition may include the amino alcohol diluted to 1 to 25% by volume. In addition, the composition is a group consisting of sodium carbonate (Na ₂ CO ₃ ), sodium hydrogen carbonate (NaHCO ₃ ), potassium carbonate (K ₂ CO ₃ ) and potassium iodide (KI) in order to improve the removal performance of certain components in the air It may further include one or more salts selected from, inorganic acids such as phosphoric acid, aromatic amines, and bases such as potassium hydroxide (KOH).

In another embodiment of the present invention, the coating composition for a deodorizing filter is characterized in that it comprises a persimmon extract and amino alcohol as active ingredients. By adding amino alcohol to the persimmon extract, the amount of formaldehyde removed can be maximized.

The composition may include the persimmon extract and the aqueous amino alcohol solution in a volume ratio of 5:1 to 1:5.

The composition may include persimmon extract diluted to 1 to 10% by volume and amino alcohol diluted to 1 to 25% by volume. In addition, the composition is one or more inorganic acids selected from the group consisting of phosphoric acid, hydrochloric acid and formic acid, aromatic amines, inorganic salts such as potassium iodide (KI) or potassium hydroxide (KOH) in order to improve the removal performance of specific components in the air. ) may further include a base such as

In another embodiment of the present invention, it is characterized in that it provides a deodorizing filter prepared by applying the coating composition for the deodorizing filter.

The filter may be manufactured by applying the coating composition to a support structure for a filter made of paper immersed in activated carbon or zeolite in a honeycomb shape having a hexagonal honeycomb structure by spray drying or impregnation drying.

Specifically, the spray drying method is a method of spraying the coating composition on a filter support structure made of activated carbon or zeolite, and then drying at room temperature or 30 to 80 ° C. It is a method of manufacturing a deodorizing filter to which the composition is attached by impregnating the support structure for the filter.

Hereinafter, the present invention will be described in more detail through Examples and Experimental Examples, but the present invention is not limited thereto, and other applications and modifications of the present invention by those skilled in the art are also possible.

Examples 1-2. Coating composition for deodorizing filter

Persimmon juice was extracted by putting 3 L of 10% ethanol aqueous solution into 300 g of persimmon solid obtained by pulverizing persimmon or persimmon skin, and leaving it in an oven at 80° C. for 24 hours. The supernatant of the extracted persimmon juice was placed in another glass bottle, 50 g of activated carbon for deodorization was added thereto, and the mixture was left in an oven at 80° C. for 10 hours. The left solution was filtered with filter paper to obtain 1.5 L of clear persimmon extract.

Then, in order to remove the persimmon odor component present in the persimmon extract, zeolite was added to the persimmon extract and heat-treated at 50 to 80°C.

5% by volume of the heat-treated persimmon extract, 5% by volume of phosphoric acid, and 90% by volume of distilled water were added and mixed to prepare a persimmon extract (5% diluted solution). In addition, 10% by volume of the persimmon extract, 5% by volume of phosphoric acid, and 85% by volume of distilled water were added and mixed to prepare a persimmon extract (10% diluted solution).

division composition for coating Example 1 Persimmon extract (5% dilution) Persimmon extract + phosphoric acid + distilled water Example 2 Persimmon extract (10% dilution) Persimmon extract + phosphoric acid + distilled water

Examples 3-5. Coating composition for deodorizing filter

Potassium carbonate and potassium iodide were added to distilled water and mixed, and aminoethanol was added to the mixture in an amount of 1 to 3 and 10% by volume to prepare an aqueous aminoethanol solution.

division composition for coating Example 3 Aminoethanol (1%) aqueous solution Aminoethanol (1%) + potassium carbonate + potassium iodide + distilled water Example 4 Aminoethanol (2%) aqueous solution Aminoethanol (2%) + potassium carbonate + potassium iodide + distilled water Example 5 Aminoethanol (3%) aqueous solution Aminoethanol (3%) + potassium carbonate + potassium iodide + distilled water Example 6 Aminoethanol (10%) aqueous solution Aminoethanol (10%) + potassium carbonate + potassium iodide + distilled water

Examples 7-9. Coating composition for deodorizing filter

The persimmon extract prepared in Examples 1-2 and the aminoethanol aqueous solution prepared in Examples 3-5 were mixed in a volume ratio of 1:1 to prepare a coating composition for a deodorizing filter according to the present invention.

division composition for coating first component second component Etc Example 7 Persimmon Extract (5%) Aminoethanol (1%) + potassium carbonate + potassium iodide Distilled water Example 8 Persimmon Extract (10%) Aminoethanol (2%) + potassium carbonate + potassium iodide Distilled water Example 9 Persimmon Extract (10%) Aminoethanol (3%) + potassium carbonate + potassium iodide Distilled water

Comparative Example 1. Coating composition for deodorizing filter

Add 12 weights of ethyl urea, 12 weights of phosphoric acid and 66 weights of distilled water, mix for 5 minutes, put 6 weight parts of potassium carbonate, 2 weight parts of potassium iodide, 2 weight parts of cerium oxide, and mix for 10 minutes to prepare a second mixture Thus, a coating composition of Comparative Example was prepared.

experimental example. Performance evaluation

Manufacture of deodorizing filter for air purifier

By spraying the coating composition prepared in Examples and Comparative Examples on a honeycomb filter on which powder activated carbon is deposited, a deodorizing filter according to the present invention was manufactured.

The filter had a thickness of 10 mm, a size of 174 mm Х 643 mm, and was sprayed so that 0.09 g per cm 2 of an area was applied to both sides of the filter. The deodorizing filter thus applied was dried at 60° C. for 40 minutes, so that the moisture content in the filter was 5%.

On the other hand, a deodorizing filter composed only of activated carbon itself not applied with the coating composition as described above was prepared as Comparative Example 2, and the effect was comparatively analyzed.

Performance evaluation of air purifiers

In order to analyze the performance of the air purifier to which the deodorizing filter prepared above is applied, the deodorization efficiency for 5 types of gases (formaldehyde, acetic acid, acetaldehyde, ammonia, toluene) was evaluated, and the results are shown in Table 4.

A method of measuring the removal performance of the five kinds of gases is as follows. Toluene, ammonia, acetic acid, formaldehyde, and acetaldehyde gases are stored in an 8 ㎥ chamber maintained at an indoor temperature of 20-23 ℃ (23±5 ℃ according to the Air Purification Association) and 35-45 % of humidity (55±15 % according to the standard). After each 10 ppm was injected, the air purifier was operated for 30 minutes. Then, the removal rate was calculated by measuring the concentration of each component by FT-IR. The 8㎥ chamber is composed of a pannel whose inner surface is inertized, a ventilation fan that can exchange the internal air with fresh air, and a gas generator that can supply the above five gases at a constant concentration. In order to measure in real time, a device connected to an FT-IR measuring instrument was used.

As can be seen in Table 4, the deodorization efficiency is 91.9% of formaldehyde, 99.4% of acetic acid, 100% of acetaldehyde, 96.8% of ammonia, and 100% of toluene, confirming a high removal rate of 97.0% on average.

In addition, the removal rate versus time for the five kinds of gases of the manufactured deodorizing filter was analyzed, and the results are shown in Tables 5 to 7 below, and the result graphs are shown in FIGS. 2 to 4 .

First, the results of analyzing the removal rate versus time for the five types of gases of the deodorizing filter prepared by applying the coating composition according to Example 3 are shown in Table 5 and FIG. 2 .

Example 3 Gas removal rate versus time of activated carbon filter sprayed with aminoethanol (1%) aqueous solution (8㎥ chamber) 5th gas Early 5 minutes 10 minutes 15 minutes 20 minutes 25 minutes 30 minutes Removal rate Acetaldehyde 9.85 7.52 6.16 5.55 4.64 4.31 3.73 62.1% Acetic Acid 11.33 4.45 2.79 1.53 1.11 0.52 0.77 93.2% Ammonia 10.04 3.79 2.13 0.88 0.63 0.28 0.00 100.0% Toluene 10.08 4.71 2.24 0.82 0.00 0.00 0.00 100.0% Formaldehyde 9.10 4.66 2.64 1.79 1.11 0.43 0.30 96.7% Total removal efficiency (%) 90.4%

Table 6 and Figure 3 show the results of analyzing the removal rate versus time for the five kinds of gases of the deodorizing filter prepared by applying the coating composition according to Example 4.

Example 4 Gas removal rate versus time of activated carbon filter sprayed with aminoethanol (2%) aqueous solution (8㎥ chamber) 5th gas Early 5 minutes 10 minutes 15 minutes 20 minutes 25 minutes 30 minutes Removal rate Acetaldehyde 9.76 5.79 5.08 4.42 3.75 3.02 2.90 70.3% Acetic Acid 10.59 1.70 0.64 0.19 0.00 0.00 0.00 100.0% Ammonia 10.38 3.69 2.61 1.67 1.45 0.66 0.31 97.0% Toluene 11.83 5.81 2.95 1.43 0.45 0.00 0.00 100.0% Formaldehyde 9.83 4.40 2.22 1.14 0.43 0.32 0.00 100.0% Total removal efficiency (%) 93.5%

In addition, the results of analyzing the removal rate versus time for the five kinds of gases of the deodorizing filter prepared by applying the coating composition according to Example 9 are shown in Table 7 and FIG. 4 .

Example 9- Deodorization filter sprayed with a mixture of persimmon extract (10% dilution) and aminoethanol (3%) aqueous solution over time (8㎥ chamber) 5th gas Early 5 minutes 10 minutes 15 minutes 20 minutes 25 minutes 30 minutes Removal rate Acetaldehyde 10.42 6.86 4.76 3.41 2.42 2.05 1.32 87.3% Acetic Acid 10.26 2.79 0.19 0.00 0.00 0.00 0.00 100.0% Ammonia 10.72 1.68 0.81 0.68 0.96 0.92 0.79 92.7% Toluene 11.54 4.12 2.12 0.57 0.00 0.00 0.00 100.0% Formaldehyde 10.09 2.30 0.10 0.00 0.00 0.00 0.00 100.0% Total removal efficiency (%) 96.0%

As can be seen in Tables 5 to 7, it can be confirmed that the deodorizing filter coated with a composition comprising a persimmon extract and 3% aminoethanol aqueous solution has the best removal performance for the five types of gases.

On the other hand, the time-relative removal rate for the five types of gases of the activated carbon deodorizing filter to which the coating composition according to the present invention is not applied at all was analyzed, and the results are shown in Table 8 below. In addition. Formaldehyde removal efficiency was analyzed for each input frequency, and a graph of the results is shown in FIG. 5 .

Comparative Example 2 Gas removal rate versus time of activated carbon deodorization filter (8㎥ chamber) 5th gas Early 5 minutes 10 minutes 15 minutes 20 minutes 25 minutes 30 minutes Removal rate Acetaldehyde 10.73 9.11 8.18 6.90 7.03 7.11 7.20 32.9% Toluene 10.37 3.86 0.73 0.00 0.00 0.00 0.00 100.0% Acetic acid 11.29 3.90 1.38 0.43 0.00 0.00 0.00 100.0% Ammonia 12.12 5.68 3.08 2.80 2.10 1.89 1.54 87.3% Formaldehyde 11.05 8.09 5.56 4.68 4.12 3.61 3.36 69.6% Total removal efficiency (%) 78.0%

As can be seen in Table 8, in the case of a deodorizing filter composed only of activated carbon itself without applying the coating composition according to the present invention, a removal rate of 100% was shown within 30 minutes for toluene and acetic acid, but ammonia, acetaldehyde and It can be seen that the removal performance for formaldehyde is significantly lowered. In particular, the removal efficiency for acetaldehyde and formaldehyde falls short of the certification standards of the Korea Air Cleaning Association.

That is, when these results are taken together, the deodorizing filter coated with the composition containing the persimmon extract or aminoethanol or a mixture thereof of one embodiment, rather than the deodorizing filter made of only activated carbon, is the above five kinds of gases, particularly acetaldehyde. It can be seen that the removal performance was significantly improved with respect to and formaldehyde.

On the other hand, in order to compare the gas removal performance of the coating composition of one embodiment of the present invention and the coating composition of Comparative Example 1, the removal efficiency of the deodorizing filter coated with each composition was analyzed for formaldehyde.

The removal efficiency by the number of injections of formaldehyde was analyzed, and the continuity of the effect was confirmed by injecting a total of 15 times. The results are shown in Tables 9 and 10 and are shown in FIGS. 6 and 7 .

Example 6 - Removal rate for each input frequency of 20 ppm formaldehyde to an activated carbon deodorizing filter sprayed with aminoethanol (10%) division Early 10 minutes 20 minutes 30 minutes 40 minutes 50 minutes 60 minutes Removal rate 1 time 20.64 0.00 0.00 0.00 0.00 0.00 0.00 100.0% Episode 2 20.28 0.00 0.00 0.00 0.00 0.00 0.00 100.0% 3rd time 21.48 0.00 0.00 0.00 0.00 0.00 0.00 100.0% 4 times 21.48 0.00 0.00 0.00 0.00 0.00 0.00 100.0% 5 times 19.51 0.00 0.00 0.00 0.00 0.00 0.00 100.0% 6 episodes 20.47 0.00 0.00 0.00 0.00 0.00 0.00 100.0% Episode 7 21.37 0.21 0.00 0.00 0.00 0.00 0.00 100.0% Episode 8 20.24 0.06 0.00 0.00 0.00 0.00 0.00 100.0% Episode 9 20.00 0.59 0.00 0.00 0.00 0.00 0.00 100.0% 10 episodes 20.66 0.57 0.00 0.00 0.00 0.00 0.00 100.0% Episode 11 22.51 1.08 0.00 0.00 0.00 0.00 0.00 100.0% Episode 12 22.12 0.24 0.00 0.00 0.00 0.00 0.00 100.0% Episode 13 22.05 0.54 0.00 0.00 0.00 0.00 0.00 100.0% Episode 14 20.06 0.79 0.06 0.00 0.00 0.00 0.00 100.0% Episode 15 21.08 1.86 0.11 0.00 0.00 0.00 0.00 100.0%

Comparative Example 1- Removal rate of 20ppm formaldehyde for each input frequency of the activated carbon deodorization filter sprayed with ethylene urea division Early 10 minutes 20 minutes 30 minutes 40 minutes 50 minutes 60 minutes Removal rate 1 time 20.63 0.28 0.00 0.00 0.00 0.00 0.00 100.0% Episode 2 19.69 0.79 0.00 0.00 0.00 0.00 0.00 100.0% 3rd time 21.49 1.56 0.00 0.00 0.00 0.00 0.00 100.0% 4 times 20.15 1.77 0.00 0.00 0.00 0.00 0.00 100.0% 5 times 19.62 2.02 0.32 0.00 0.00 0.00 0.00 100.0% 6 episodes 20.82 2.52 0.70 0.00 0.00 0.00 0.00 100.0% Episode 7 20.17 3.23 0.92 0.19 0.00 0.00 0.00 100.0% Episode 8 19.96 3.19 1.04 0.37 0.35 0.00 0.00 100.0% Episode 9 20.50 3.76 1.16 0.79 0.40 0.33 0.00 100.0% 10 episodes 20.07 4.26 3.07 1.41 0.89 0.26 0.00 100.0% Episode 11 20.59 4.33 3.01 1.33 0.98 0.45 0.12 99.4% Episode 12 19.77 3.46 1.77 1.02 0.65 0.37 0.23 98.8% Episode 13 19.86 4.49 2.16 1.49 1.12 0.84 0.72 96.4% Episode 14 20.10 4.19 2.60 1.59 1.03 1.15 0.78 96.1% Episode 15 21.55 5.94 3.26 2.43 2.02 1.65 1.12 94.8%

As can be seen in Tables 9 and 10, in the case of the deodorizing filter coated with the coating composition of Example 6 of the present invention, a 100% removal rate for formaldehyde was observed even after 15 consecutive measurements, whereas the coating composition of Comparative Example 1 was applied In the case of the deodorized filter, the removal rate started to decrease from the 11th time, and the removal rate was 94.8% at the 15th time.

That is, it can be seen that the deodorizing filter coated with the coating composition according to the present invention has an absolutely excellent removal amount for formaldehyde.

So far, with respect to the present invention, the preferred embodiments have been looked at. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention.

100: manufacturing step of persimmon extract
200: first mixture generation step
300: Secondary mixture generation step
400: deodorizing filter application step
500: deodorizing filter drying step

Claims (15)

delete delete delete delete delete delete delete As a coating composition for a deodorizing filter comprising a persimmon extract and amino alcohol,
The persimmon extract is extracted with one or more solvents selected from the group consisting of water, methanol, ethanol and propanol, and impregnated with one or more components selected from the group consisting of zeolite, activated carbon, bentonite, and mixtures thereof at room temperature. Or, it is heat-treated at a temperature of 50 to 80 ℃,
The amino alcohol is aminoethanol, amino-2-propanol, 3-amino-1-propanol, 2-amino-1-propanol, amino-1,2-propanediol, 2-amino-1,3-propanediol, 1 , At least one selected from the group consisting of 3-diamino-2-propanol, a coating composition for a deodorizing filter.
delete delete delete 9. The method of claim 8,
The composition further comprises at least one inorganic acid selected from the group consisting of phosphoric acid, hydrochloric acid and formic acid, the coating composition for a deodorizing filter.
9. The method of claim 8,
The composition further comprises at least one salt selected from the group consisting of sodium carbonate (Na ₂ CO ₃ ), sodium hydrogen carbonate (NaHCO ₃ ), potassium carbonate (K ₂ CO ₃ ) and potassium iodide (KI), deodorizing A coating composition for a filter.
A deodorizing filter prepared by applying the composition according to claim 8.
15. The method of claim 14,
The filter is a deodorizing filter that is manufactured by applying the coating composition to a support structure for a filter made of a paper immersed in activated carbon or zeolite in a honeycomb shape by spray drying or impregnation drying.

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