JP4307280B2 - Method for producing environmental modifier - Google Patents

Description

  The present invention relates to an environmental modifier that decomposes and adsorbs harmful substances present in indoor environments such as buildings and automobiles to improve a healthy environment for human beings.

  As environmental modifiers for modifying the indoor environment to be comfortable for human beings, charcoal such as charcoal and bamboo charcoal and photocatalyst typified by titanium dioxide are widely used. Solid or powdered charcoal has excellent adsorption performance for moisture, odor components, and harmful substances such as formaldehyde, but it is difficult to maintain the performance over a long period of time. In addition, it is troublesome to handle black solid charcoal or powdered charcoal in a bag, and it is designed to apply black charcoal itself to the surface of solid objects such as building materials, clothes, and painted surfaces. It is also difficult.

The photocatalyst of titanium oxide is a ceramic fine powder used for pigments such as cosmetics and food additives, and is commercially available as a photocatalyst aqueous solution dissolved in water (pure water) (see, for example, Patent Document 1). This aqueous photocatalyst solution is applied to the surface of a solid object by spraying, brushing, or the like, and the applied coating film is dried, so that the photocatalyst fine powder is fixed to the surface of the solid object in a thin film. The photocatalyst fine powder on the surface of a solid object has a photocatalytic function that oxidizes and decomposes harmful substances such as surrounding organic compounds (formaldehyde, acetaldehyde, toluene, xylene, etc.) when exposed to sunlight or fluorescent light. Excellent antibacterial action. Further, the aqueous photocatalyst solution is slightly cloudy but has good transparency, and even if it is applied as a thin film on the surface of a solid object such as an indoor wall, furniture, or curtain, the design of the solid object is hardly impaired.
JP 10-67516 A

  The photocatalyst aqueous solution is commercially available as a photocatalyst coating agent. However, the photocatalyst fine powder in the coating agent does not exhibit the photocatalytic function in the dark where there is no sunlight or fluorescent light and at night. Moreover, even if the photocatalyst fine powder is sufficiently irradiated with light, it is difficult to stably develop a photocatalytic function that oxidizes and decomposes organic compounds and the like in a short time. For example, Table 1 shows test data of a formaldehyde oxidative degradation test conducted at the “Japan Spinning Inspection Association Kinki Plant” using a photocatalytic coating agent mainly composed of titanium dioxide. Table 1 shows the following samples coated with a photocatalyst coating agent, and the concentrations in the Tedora bag after 0 minute (immediately), after 2 hours, and after 5 hours were measured.

[Test conditions]
-Sample size: 15cm x 15cm
・ Test container: 5 liter Tedlar bag ・ Gas volume in the container: 3 liters ・ Gas initial concentration: 15 ppm formaldehyde
・ Gas measurement method: Detector tube ・ Test room temperature: 20 ℃
UV intensity: 1 mW / cm ² (sample surface)
・ Blank test: The test was carried out without putting the sample in the tedora bag.

  From Table 1, it can be seen that 15 ppm of formaldehyde decreases to about 0.3 ppm after several hours, and the photocatalytic effect is remarkable. However, in order to suppress sick house syndrome, which has been regarded as a problem in recent years, it is not possible to reduce the amount to 0.08 ppm or less, which is the legally stipulated guideline of the Ministry of Health, Labor and Welfare.

This onset Ming, that provide excellent environmental modifier oxidative decomposition function of harmful substances such as organic compounds.

The environmental modifier, which is a mixture of a photocatalyst fine powder and a water-based photocatalyst solution, a plurality of useful microorganisms containing actinomycetes and a water-based microbial group solution, is attached to a solid object and dried. Thus, the useful microorganism group and the photocatalyst fine powder can be fixed on the surface of the solid object in a thin film state.

  That is, the present inventor has paid attention to useful microorganism groups (Gram-positive actinomycetes group, photosynthetic bacteria group, etc.) that have been regarded as effective as soil conditioners in recent years and have been successfully used. The present invention could be made. As described in Japanese Patent Application Laid-Open No. 2003-342571, the useful microorganism group is a plurality of types of fungi (such as actinomycetes, photosynthetic bacteria, and filamentous fungi) that are useful for humans (such as group 5, group 10 and 80 species). If the cultures in the soil are sprayed on the soil, the soil will be modified and a natural farming method will be performed in which the crops grow well. For example, photosynthetic bacteria of the useful microorganism group break down malodorous components into sugars and oxygen to deodorize them, and actinomycetes make antibacterial substances by using the sugars produced by the photosynthetic bacteria as feed, and suppress the generation of pathogenic bacteria such as E. coli and mold. Therefore, the present inventor was concerned that useful microorganisms would be the target of the antibacterial and sterilizing function of the photocatalyst, but a plurality of useful types including a photocatalyst aqueous solution mainly composed of water containing several percent of the photocatalyst fine powder and actinomycetes. As a result of repeating the experiment of mixing a microorganism group aqueous solution containing water containing microorganisms as a main component in a desired ratio and applying it to a solid object such as a wall or a curtain under various conditions, the above concerns were eliminated. At the same time, we have developed environmental modifiers with increased photocatalytic function. The reason for the increase in the photocatalytic function in this environmental modifier is presumed to be a synergistic effect due to coexistence with useful microorganisms. The environmental modifier is an aqueous solution, applied to a solid object by spraying, brushing, sponge transfer, etc., and dried to give useful microorganisms and fine photocatalyst powder on the inner and outer surfaces of the solid object. It can be mixed and fixed in a thin film. Also, an aqueous environmental modifier may be mixed with a specific paint and applied to a solid object together with the paint.

  In the present invention, a step of applying a microbial group aqueous solution containing a plurality of types of resuscitation-type useful microorganisms containing actinomycetes in a thin film on the surface of a solid object, and a coating of the microbial group aqueous solution applied to the surface of the solid object A step of spraying an aqueous photocatalyst solution containing fine photocatalyst powder on the film in a thin film to produce a thin film-like environmental modifier in which the microbial group aqueous solution and the photocatalyst aqueous solution are mixed on the surface of the solid object, and the surface of the solid object It is possible to produce and use an environmental modifier in the process of drying the coating film of the environmental modifier applied on the surface and fixing the useful microorganism group and the photocatalyst fine powder on the surface of the solid object in a thin film form. it can. In this case, the microbial group aqueous solution previously applied to the solid object becomes a base material for the photocatalyst aqueous solution to be sprayed on the solid object later, and the photocatalyst aqueous solution and the microbial group aqueous solution are mixed evenly on the surface of the solid object.

  After coating a photocatalyst aqueous solution containing fine photocatalyst powder on the surface of a solid object in a thin film, a microbial group aqueous solution containing a plurality of types of resuscitation-type useful microorganisms containing actinomycetes is formed into a thin film on this coating film. By spraying, it is also possible to produce a thin film-like environmental modifier in which the microbial group aqueous solution and the photocatalyst aqueous solution are mixed on the surface of the solid object. In addition, useful microorganisms in the microbial group aqueous solution are inactivated, and it is desirable to fix them to a solid object and resuscitate them in order to effectively use the useful microorganisms for environmental reform over a long period of time.

  According to the present invention, both the photocatalytic function and the environmental reforming function of useful microorganisms are exhibited, and particularly the sick house syndrome, which has been particularly problematic in recent years and has excellent oxidative decomposition function of organic compounds, is continuously suppressed over a long period of time. Therefore, it is possible to provide an environmental modifier that is effective. In addition, both aqueous photocatalyst solution and microbial group aqueous solution can be used as a highly transparent aqueous solution, so it can be used as a design material for interior materials such as interior materials such as interior materials such as indoor walls, curtains, and furniture, as well as furniture. It is possible to provide an environmental modifier excellent in practical value that can be used without impairing the properties.

  Commercially available products can be used for both the aqueous photocatalyst solution and the aqueous microbial group solution for producing the environmental modifier according to the present invention. For example, a photocatalyst aqueous solution is a titanium oxide coating agent known as the PTA solution or PA sol trade name of Saga Prefectural Ceramics Technology Center, which contains water (pure water) as the main component and titanium dioxide fine powder of several percent (w / w) Including. The microbial community aqueous solution is a coating agent known by the trade name of EM Research Organization EM-2, EM-3, EMW, which also has water as the main component, such as Gram-positive actinomycetes, photosynthetic bacteria, etc. It contains resuscitation-type useful microorganisms in an inactivated state, and these useful microorganisms are revived when they are applied to a solid object and the environment changes.

  Mix the photocatalyst aqueous solution and the microorganism group aqueous solution in one container, or mix one or both of them with water in a suitable container and mix them in one container. An aqueous environmental modifier is produced. When this environmental modifier is applied to solid objects such as building materials in the form of a thin film by spraying, etc., and dried, the main component moisture is blown off, and the photocatalyst fine powder and microorganisms adhere to the surface of the solid object in a thin film form. And these remain to function as photocatalysts and useful microorganisms to oxidize and decompose organic compounds and odorous components in the air, thereby suppressing the generation of pathogenic bacteria and mold. The photocatalyst fine powder and the photosynthetic bacteria of the useful microorganism group exhibit their functions when exposed to light such as sunlight, and the other useful microorganism groups exhibit their functions regardless of light. Therefore, after the environmental modifier is applied to the solid object and dried, the environmental reforming operation is continued without interruption, and quick environmental reforming and continuous environmental reforming can be performed.

  Instead of mixing the photocatalyst aqueous solution and the microbial group aqueous solution in a single container, the photocatalyst aqueous solution is applied in a thin film on the surface of the solid object, and then the microbial group aqueous solution is applied to the coating film (underlying material). It is also effective to produce an environmental modifier by mixing the aqueous microbial group solution and the aqueous photocatalyst solution on the surface of the solid object by spraying it in a thin film and drying it.

  Experimental data using the environmental modifier of the present invention as a sample are shown in FIGS. 1 and 2, which will be described.

  Figure 1 shows the test data of the formaldehyde oxidative degradation test conducted at the "Japan Spinning Inspection Association Kinki Plant". The details are shown in Table 2. FIG. 1 and Table 2 show the results when the following samples were coated with the environmental modifier of the present invention, and the concentrations in the Tedra bag after 0 minute (immediately), 2 hours and 5 hours were measured.

[Test conditions]
-Specimen: A tester that was spray-coated on the inner surface of a stomacher bag (reinforced polyethylene) (coating amount 8.7 g / m ² )
・ Sample size: 10 cm × 10 cm
・ Test container: 5 liter Tedlar bag ・ Gas volume in the container: 3 liters ・ Gas initial concentration: 15 ppm formaldehyde
・ Gas measurement method: Detector tube ・ Test room temperature: 20 ℃
UV intensity: 1 mW / cm ² (sample surface)

  As shown in FIG. 1 and Table 2, 15 ppm formaldehyde decreases linearly to 0.05 ppm after 2 hours and is less than 0.03 ppm after 5 hours. As a result, in order to suppress sick house syndrome in about 1 hour, it was able to be reduced from the 0.08 ppm guideline value of formaldehyde of the Ministry of Health, Labor and Welfare, which was stipulated by the law.

  FIG. 2 shows test data obtained by conducting an oxidative degradation test of acetaldehyde at the “Japan Spinning Inspection Association Kinki Works”. FIG. 2 and Table 3 show the results when the following test specimens were coated with the environmental modifier of the present invention, and the concentrations in the Tedra bag after 0 minute (immediately), 2 hours and 5 hours were measured. .

[Test conditions]
-Specimen: A tester that was spray-coated on the inner surface of a stomacher bag (reinforced polyethylene) (coating amount 8.7 g / m ² )
・ Blacklight fluorescent lamp: TOSHIBA FL20S / BLB 2 ・ UV intensity meter: Minolta Co., Ltd. ・ UM-10
・ Test piece: 10 × 10 cm
-Pretreatment: UV irradiation 24 hours-Fluorescent lamp height: 24 cm
-Humidity temperature in the test chamber: 20-24 ° C / 58-70% Rh
・ Air conditioning method: Air conditioner ・ Test conditions: Valid

  As shown in FIG. 2 and Table 3, it was found that 15 ppm of acetaldehyde decreased linearly to the extent that it could not be measured after 2 hours, and the removal rate was almost 100% after 5 hours. A similar removal rate is possible for other organic compounds such as toluene and xylene, and the guideline value of 0.03 ppm of the Ministry of Health, Labor and Welfare's acetaldehyde for suppressing sick house syndrome is cleared in a very short time, and the environmental improvement for organic compounds is achieved. It was certified that the quality effect is even better.

It is a graph which shows the reduction rate experiment data of formaldehyde by the environmental modifier of this invention. It is a graph which shows the reduction rate experimental data of the acetaldehyde by the environmental modifier of this invention.

Claims (1)

  A step of applying a microorganism group aqueous solution containing a plurality of types of resuscitative microorganisms containing actinomycetes on a surface of a solid object in a thin film, and a photocatalytic fine coating on the coating film of the microorganism group aqueous solution applied to the surface of the solid object A step of spraying an aqueous photocatalyst solution containing powder in the form of a thin film to produce an environmental modifier in the form of a thin film in which the aqueous solution of the microbial group and the aqueous photocatalyst solution are mixed on the surface of the solid object, and coating on the surface of the solid object A method for producing an environmental modifier, comprising: drying the coated film of the environmental modifier, and fixing the useful microorganisms and the photocatalyst fine powder in a thin film on the surface of the solid object.