KR100357765B1 - Process of preparation of photo-semiconductive filter for deodorization and antibacterial activity and photo-semiconductive filter for deodorization and antibacterial activity used this process - Google Patents

Abstract

The present invention provides a method for producing a photosemiconductor deodorant / antibacterial filter suitable for suppressing the removal of odor gas and propagation of microorganisms in an air conditioner such as an air cleaner, a household or vehicle air conditioner, a ventilation fan, and an optical semiconductor deodorizer / The present invention relates to an antibacterial filter, wherein the deodorizing filter composed of one kind or two or more kinds of nonwoven fabric, activated carbon, zeolite, and ocher is composed of an aqueous solution or powder state in which TiO ₂ , SiO ₂ , ZnO and silver are treated in combination. By supporting semiconducting composite ceramics, it adsorbs and oxidizes odorous substances such as ammonia, methyl mercaptan, hydrogen sulfide, methane sulfide and trimethylamine, as well as various food odors generated during cigarette smells and cooking. Adsorption and removal of bacteria as well as showing the ability of sterilization is to keep the indoor air always comfortable.

Description

Process of preparation of photo-semiconductive filter for deodorization and antibacterial activity and photo-semiconductive filter for deodorization and antibacterial activity used this process}

The present invention provides a method for producing a photosemiconductor deodorant / antibacterial filter suitable for suppressing the removal of odor gas and propagation of microorganisms in an air conditioner such as an air cleaner, a household or vehicle air conditioner, a ventilation fan, and an optical semiconductor deodorizer / The present invention relates to an antibacterial filter, and a method of manufacturing a deodorizing / antibacterial filter carrying optical semiconducting ceramics suitable for use indoors where strong ultraviolet rays such as infrared (UV) lamps and outdoor sunlight cannot be obtained, and an optical peninsula manufactured thereby It relates to a sex deodorant / antibacterial filter.

For example, devices that create airflow using electric blowers such as air cleaners, ventilation fans, household and car air conditioners, fans, vacuum cleaners, clothes dryers, dish dryers, dishwashers, kitchen waste processors, radiators, humidifiers and deodorizers. The present invention relates to filters installed in the air conditioner, which prevents pollution, removes odors, antibacterial, and The present invention relates to a method for producing a filter for obtaining properties such as mold, wettability improvement, prevention of deterioration due to saturation, and a filter produced thereby.

In general, an air purifier, that is, a device for the purpose of removing dust or odorous substances in indoor air, such as titanium oxide or titanium oxide on the surface of a resin coating of an aluminum sheet formed on a collecting counter electrode of an air cleaner, as in Patent 1998-600597. Thin film coating of catalyst and applying high voltage of high frequency pulse or high voltage mixed with direct current and high frequency pulse to the voltage applied to the ionizing part is applied to low temperature plasma deodorizing effect In order to improve the deodorizing performance by compounding, or a photocatalyst coated ultraviolet lamp is used in combination between a prefilter and a dust collecting filter having an ionizing part and a collecting part as in Patent 1997-039822.

In addition, as a case of application as a deodorizing filter installed in a ventilation path of a vacuum cleaner or kitchen waste, a technique has been proposed in which a photocatalyst powder type containing titanium dioxide as a main component is stacked in a plastic fiber sheet and heat sealed.

However, in the dust, various microorganisms are attached and move in the air. As the dust is accumulated on each pole plate of the collector for a long time, the odor is generated by the growth of microorganisms, and the fine dust including microorganisms that are not deposited on the collecting pole is deodorized. There is a risk of passing through the filter to the outside, there is a limit to completely remove the smell even if there is a deodorizing filter.

In addition, the photocatalyst thin film requires heat treatment at least several hundred degrees Celsius and at least 300 degrees Celsius in order to crystallize the titanium oxide, making it difficult to form a film on a low heat resistance base such as plastics, especially general-purpose thermoplastics, and the organic component of the photocatalyst itself. There is a problem that the decomposition speed of the battery is not sufficient and a separate light source (U, V lamp or the like) is required.

Accordingly, the present invention has been made to solve the problems described above as TiO ₂ sol (TiO ₂ sol) 0.57mol / L, made of Ti [OCH (CH ₃ ) ₂ ] ₄ and (CH ₃ ) ₂ CHOH, C ₈ 0.44 mol / l SiO ₂ sol made from H ₂₀ 0 ₄ Si and (CH ₃ ) ₂ CHOH, 0.5 mol / l Zn0 sol made from Zn (C ₂ H ₃ O ₂ ) ₂ and silver (Silver), each of which was treated with a mixture of 50% TiO ₂ sol, 50% SiO ₂ sol, 9% ZnO sol, and 1% Silver by weight, or The optically semiconducting composite ceramics, which are formed in a powder state, are immersed in a deodorizing filter composed of one or two or more of nonwoven fabrics, activated carbon, zeolites, and ochers to sterilize microorganisms, decompose odor gases, and saturate adsorbents. Method of manufacturing a deodorizing / antibacterial filter that can clean the air discharged to the room by preventing deterioration and the optical semi-conductive deodorizing / antibacterial filter produced by It is for the purpose of providing.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

Preparation of the optical semiconductive deodorant / antibacterial filter according to the present invention is a) titanium isopropoxide Ti [OCH (CH ₃ ) ₂ ] ₄ ) and isopropyl alcohol (CH ₃ ) ₂ CHOH). SiO prepared from 0.57 mol / l of TiO ₂ sol, tetraethyl orsosilicate Tetraethoxysilane C ₈ H ₂₀ O ₄ Si, and isopropyl alcohol (CH ₃ ) ₂ CHOH ₂ sol (sol) 0.44mol / ℓ, zinc acetate _{(Zn acetate Zn (C 2 H} 3 O 2) 2) a ZnO sol (sol) 0.5mol / ℓ, and the weight is compared to each of them producing a (Silver) prepared from An optical peninsula characterized in that the solution is composed of an aqueous solution or powder in a combination of 50% TiO ₂ sol, 40% SiO ₂ sol, 9% ZnO sol and 1% Silver. Step for preparing a composite composite ceramics, b) TiO _{2 in the} deodorizing filter consisting of one or two or more of non-woven fabric, activated carbon, zeolite, ocher , The optically conductive composite ceramics composed of an aqueous solution or a powder mixed with SiO ₂ , ZnO and silver (Silver) in the pores of the deodorizing filter, c) drying to a temperature of 300 ℃ or less It is done.

Preferably, it is preferable that 1-20 weight part of predetermined optical semiconducting composite ceramics is added with respect to 100 weight part of deodorizing filters which consist of 1 type, or 2 or more types of nonwoven fabric, activated carbon, zeolite, and ocher.

The optical semiconducting composite ceramics described above are 0.57 mol of TiO ₂ sol made of Ti [OCH (CH ₃ ) ₂ ] ₄ and (CH ₃ ) ₂ CHOH, which is filed by the inventor (Application No. 10-1999-0009735). / l, SiO ₂ sol made from C ₈ H ₂₀ 0 ₄ Si and (CH ₃ ) ₂ CHOH 0.44 mol / l, Zn0 sol made from Zn (C ₂ H ₃ O ₂ ) ₂ 0.5 mol / l and silver were prepared, respectively, by weight ratio of TiO ₂ sol 50%, SiO ₂ sol 40%, ZnO sol 9% and silver 1%. 1 to 20 parts by weight based on 100 parts by weight of a deodorizing filter composed of one or two or more of nonwoven fabric, activated carbon, zeolite, and ocher as an optical semiconducting composite ceramic, characterized in that it is composed of an aqueous solution or powder. It is preferable.

As described above, the optical semiconductive deodorizing / antibacterial filter according to the present invention is expressed by a catalytic reaction (oxidation) that is different from the conventional physical adsorption, chemical adsorption, neutralization, and masking. The photocatalyst titanium dioxide (TiO ₂ ) And SiO ₂ , ZnO has a deodorization and antibacterial effect by a catalyst consisting of an aqueous solution or powder state of the metal ions complex treatment.

However, in general, the deodorization rate of the catalytic reaction at room temperature is known to be inferior to the deodorization rate and the deodorization rate by physical and chemical adsorption reactions. However, in the case of adsorption, the odor is lost after the saturation in the adsorbent is re-released again, but the catalytic reaction can continue to express the deodorizing effect

In addition, since the optical semiconducting composite ceramics are ultra-fine particles, they can be supported regardless of the surface of the base material without changing the characteristics of the base surface, and are not subjected to the aging and crystallization process by high temperature heat treatment, thereby making the fiber product and the thermosetting resin. It is possible to develop a wide range of applications.

Such optical semiconducting composite ceramics have an oxidizing ability at room temperature and remove odorous substances by oxidation of a catalyst. In addition, the deodorization rate increases due to external factors such as UV irradiation and temperature increase, and there is no saturation deterioration, which is a defect of adsorption deodorization. You can expect the effect to continue.

In addition, by inhibiting the propagation of microorganisms, which is a secondary cause of odor generation by metal ions, which are active ions, it is possible to exhibit excellent deodorizing performance by two mechanisms of deodorization / antibacterial action by suppressing odor generation by decomposition of organic matter.

EXAMPLE

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1.

Example 1 of the present invention is a deodorizing effect and deodorizing mechanism for methyl mercaptan, trimethylamine, ammonia of the optical semiconducting deodorizing / antibacterial filter (developed product) prepared by the method of manufacturing the above-mentioned optical semiconducting deodorizing / antibacterial filter. , Deodorization durability was tested.

1. Deodorization effect

1) Experimental Method: Gas Detection Tube Method

Put the sample (developed product) into 10 × 10cm, put it in the test container, and put each test gas into it, and divide it into 30 minutes, 60 minutes, 90 minutes, and 120 minutes. Deodorization rate was calculated by comparing with Blank.

3) Test condition

-Sample size: 10 × 10cm

-Amount of injected gas: 100ml

-Volume of container used in the experiment: 500 ml

-Temperature: Room temperature

-Types of gas: methyl mercaptan, trimethylamine, ammonia

4) Test result

As shown in the above table, the deodorization rate for methyl mercaptan, trimethylamine, and ammonia was 100% in both the light source (general fluorescent lamp + ultraviolet lamp) and the light source after 120 min.

2. Deodorizer

The deodorizing mechanism manufactured by the method of manufacturing the optical semiconductive deodorizing / antibacterial filter is due to a catalytic reaction (oxidation reaction) different from the conventional physical adsorption and chemical adsorption.

In order to confirm this catalytic reaction, 2 ml of pure ethylmercaptan was directly contacted with 10 × 10 cm of the specimen of the optical semiconducting deodorization / antibacterial filter at room temperature for 6 hours, followed by gaschromato mass spectrometry before and after reacting the optical semiconducting deodorization / antibacterial filter with ethylmercaptan. Was carried out. Before the reaction, pure ethylmercaptan peaks were observed, but after the reaction, another peak was observed in addition to the ethylmercaptan peak. This peak was identified as diethylsulfide because the peak was high. From the gaschromato mass spectrometry results, the reactor port of this odor is as follows.

CH ₃ -CH ₂ -SH + 1 / 2O ₂ CH ₃ -CH ₂ -SS-CH ₂ -CH ₃ + H ₂ O

It can be seen that the thiol group of ethylmercaptan is dehydrogenated and is excited by raising the temperature or irradiating with ultraviolet rays in the reaction at room temperature produced by diethylsulfide to increase the reaction rate.

In addition, the reaction of nitrogen-based odor was carried out by placing ammonia and a light semiconducting deodorizing / antibacterial filter in 10 L of tetrapack, indicating that nitrogen oxide was gradually observed and oxidized ammonia.

As shown above, it was confirmed that the deodorizing action of the optical semiconductive deodorizing / antibacterial filter is expressed by a different catalytic action (oxidation) than the conventional physical adsorption, chemisorption, neutralization and masking.

3. Deodorization durability

1) Experimental method: Activated carbon was loaded with photoconductive composite ceramics to make a dry sample (developed product) and compared with normal activated carbon. In the deodorization test method, 2 g of sample was placed in a 2 L container, and odor gas was injected at a concentration of 100 ppm, divided into 10 minutes, 20 minutes, and 30 minutes, and the odor concentration was measured by a detection tube. Repeated five times, the odor concentration was measured at each frequency, and the deodorization durability test was performed.

2) Test condition

-Sample amount: 2g

-Concentration of injected gas: 100ppm

-Volume of container used in the experiment: 2 ℓ

-Temperature: Room temperature

-Type of gas: Ammonia

From the above results, there was no significant difference in the deodorizing performance of activated carbon treated with optical semiconducting composite ceramics and untreated activated carbon, but with activated carbon treated with optical semiconducting composite ceramics as the number of injections of ammonia gas increased. Although the deterioration proceeds at a slow rate, it can be seen that in the untreated activated carbon, the saturation starts from three times of odor injection, and the deodorizing performance is lost.

In other words, in the untreated activated carbon, the odor is absorbed by the saturation and there is no deodorizing effect. However, the activated carbon treated with the photo-semiconductor composite ceramics first adsorbs the odor and the catalytic action of the photo-semiconductor composite ceramic on the surface The gas is oxidized to suppress the decrease in efficiency.

Example 2.

Example 2 of the present invention is directed to a method for producing the optical semiconductive deodorant / antibacterial filter described above. Microorganisms, ie, general bacteriaEscherichia coliATCC 43888 (O-157)) and mold (Aspergillus nigerATCC 6275) was tested for antibacterial and fungal resistance.

1) Antimicrobial effect evaluation

-Test Method: Shake Flask Test

Add 70 ml of PO ₄ Buffer and 5 ml of inoculum to 250 ml Flask, and put 0.75 g of test sample into the sample Flask finely (1 × 1cm or less) and place it at 25 ± 5 ℃. Shake for 3 hours (rpm: 320-340). The test solution is diluted (1, 10, 100 times) using a working solution. The diluted bacteria solution is incubated in medium (Standard Agar) for 24 to 48 hours at 37 ℃.

Reduction factor = (A-B / A) × 100

Where A is the number of viable cells at '0' time, B is the number of viable cells regenerated from the test sample.

Test strain: Escherichia coli ATCC 43888 (O-157)

As a result, as shown in Table 5, it can be seen that the sterilization rate of 99% or more after the shaking for 3 hours, regardless of the presence or absence of the light source, shows that the antimicrobial activity of the light semiconductive deodorant / antibacterial filter is sufficiently exhibited.

2) Mildew Resistance Test

-Test method: KS A 0702

After placing the sample on a plate medium inoculated with test mold and incubating for a certain period of time (28 ± 2 ℃, 90% humidity), the mold growth on the sample is visually evaluated.)

-Used strain: Aspergillus niger ATCC 6275

The results are shown in Table 6 and the mildew resistance of the optical semiconductive deodorant / antibacterial filter. That is, the development of the hyphae was not recognized in the inoculated portion of the sample or test specimen. You can see that it is.

As described above, the optical semiconductive deodorizing / antibacterial filter according to the present invention has a catalytic action (oxidation capacity) at room temperature with or without a light source, and removes odorous substances by oxidation of the catalyst. In addition, the deodorization rate increases due to external factors such as UV irradiation and temperature increase, and there is no saturation deterioration, which is a defect of adsorption deodorization. It is effective to continue.

In addition, it is possible to exhibit excellent deodorizing performance by two mechanisms of deodorization / antibacterial action by inhibiting the generation of odor by decomposition of organic matter by inhibiting the propagation of microorganisms which are two-dimensional odor generation by metal ions which are active ions.

Preferred embodiments described in the specification of the present invention are illustrative and not restrictive, the scope of the invention is indicated by the appended claims, and all modifications falling within the meaning of those claims are included in the present invention. will be.

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Claims (4)

1) TiO ₂ sol, SiO ₂ sol, ZnO sol and silver weight ratio TiO ₂ sol 50%, SiO ₂ sol 40%, ZnO sol 9% and Composite-processing silver at a rate of 1% to produce a photoconductive composite ceramic; 2) supporting the optical semiconducting composite ceramics prepared in step 1) in the pores of at least one deodorizing filter selected from nonwoven fabric, activated carbon, zeolite, and ocher; And 3) A method of manufacturing a light semiconducting deodorizing / antibacterial filter comprising drying the deodorizing filter prepared in step 2) at 300 ° C. or lower. The method of claim 1, wherein the TiO ₂ sol, SiO ₂ sol and ZnO sol of step 1) are made of Ti [OCH (C ₁₃ ) ₂ ] ₄ and (CH ₃ ) ₂ CHOH. ZnO sol prepared from a TiO ₂ sol 0.57 mol / l, a sol 0.44 mol / l made of C ₈ H ₂₀ 0 ₄ Si and (CH ₃ ) CHOH, and Zn (C ₂ H ₃ O ₂ ) ₂ ( sol) 0.5 mol / L method for producing a photo-semiconductor deodorizing / antibacterial filter. The method of claim 1, wherein the optical semiconductive deodorizing / antibacterial filter is supported by 1 to 20 parts by weight based on 100 parts by weight of the deodorizing filter in step 2). A photosemiconductor deodorizing / antibacterial filter prepared by any one of claims 1 to 3.