JP3665213B2 - Method for removing volatile organic compound, removal material for volatile organic compound, and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a volatile organic compound removing material for reducing indoor pollution caused by volatile organic compounds generated from building materials, furniture, adhesives, and the like, a manufacturing method thereof, and a volatile organic compound removing method.
[0002]
[Prior art]
In recent years, especially due to the improved airtightness of office buildings and houses, volatile organic compounds (hereinafter referred to as VOC) generated from various building materials, furniture, adhesives, etc. contaminate the indoor air. It has become a problem to adversely affect the Among VOCs, benzene, toluene, and xylene, in particular, have been used as adhesives and paints, and have been representative examples of substances that are likely to cause health damage in the living environment.
[0003]
Therefore, measures to reduce the pollution of indoor air by VOCs such as toluene and xylene are as follows: (1) indoor ventilation, (2) cleaning with air cleaner, (3) use of pollutant adsorbing paper, 4) Methods such as photocatalytic decomposition have been proposed.
[0004]
[Problems to be solved by the invention]
However, each of the above measures has the following problems.
[0005]
The indoor ventilation of (1) reduces the efficiency of air conditioning in buildings and houses. In addition, the outside air may contain nitrogen oxides or the like that are considered as pollutants, and the harmful substances in the room cannot always be completely removed.
[0006]
The air purifier of (2) is for purifying air by adsorbing contaminants on activated carbon, filters, etc., but its adsorption capacity depends on the type and surface area of the activated carbon, filter, etc., so there is a limit. In addition, the substances that can be adsorbed are considerably limited. Further, when a filter or the like is used as an electrical means for air circulation, electric power or the like is required to maintain the filter, which is expensive.
[0007]
The method (3) is to adsorb VOCs to the adsorbing means of pollutants such as paper and wall materials carrying activated carbon, zeolite, etc., but its adsorption capacity is limited, and the substances that can be adsorbed are quite limited. In addition, the adsorbed substance may be re-released (desorbed) to cause contamination.
[0008]
Method (4) uses a photocatalyst such as titanium oxide to rapidly decompose organic compounds such as benzene, toluene and xylene into mainly CO ₂ gas and aldehydes such as HCHO and CH ₃ CHO. As a result of this decomposition reaction, formaldehyde, which is a harmful substance, is newly generated, so it is difficult to say that it is the best countermeasure.
[0009]
By the way, the applicant of the present application has filed an application for a novel substance having a property of capturing an aldehyde according to Japanese Patent Application No. 9-301712. This relates to an aldehyde scavenger which can convert aldehydes into stable crystals and capture them.
[0010]
The present invention has been made in view of the above circumstances, and its purpose is to rapidly decompose VOC generated from a new building or the like by the oxidation-reduction action of a photocatalyst, and to produce the generated aldehyde as an aldehyde scavenger. It is an object of the present invention to provide a removal material that can reduce VOC in an indoor space without generating other harmful substances by simply and efficiently capturing with ammonium amidosulfate, a method for producing the same, and a VOC removal method.
[0011]
Another object of the present invention is to remove the above-mentioned VOC simply by installing it in an indoor space, eliminating the need for electrical means for indoor cleaning, and reducing the cooling and heating efficiency, and its removal It is to provide a manufacturing method as well as a VOC removal method.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a VOC removal method according to the present invention includes a step of decomposing a volatile organic compound that is decomposed to produce an aldehyde using a photocatalyst , and an amide produced by the step to ammonium amidosulfate. And the step of capturing in a same layer formed on the same substrate .
[0013]
Moreover, the removing material for removing VOC according to the present invention is characterized in that the base material is provided with a mixture of a photocatalyst that promotes a decomposition reaction of a volatile organic compound that is decomposed to produce an aldehyde, and ammonium amidosulfate. To do.
[0014]
The photocatalyst is titanium oxide.
[0015]
Furthermore, the method for producing a VOC removal material according to the present invention is characterized in that a mixture of a photocatalyst that promotes a decomposition reaction of a volatile organic compound that is decomposed to produce an aldehyde and ammonium amidosulfate is supported on a substrate. And
[0016]
Prior to loading the mixture onto the substrate, a primer may be applied to the substrate. In addition, the mixture may be kneaded with a binder before the mixture is supported on the substrate .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a VOC removal method, a VOC removal material, and a method for manufacturing the same according to the present invention will be described below with reference to the accompanying drawings.
[0018]
<Constituent elements of VOC removal material>
The photocatalyst that can be used for the VOC removal material, the production method thereof, and the VOC removal method of the present invention includes titanium oxide (TiO ₂ ) and zinc oxide (ZnO). The photocatalyst is used for rapidly decomposing organic compounds such as benzene, toluene and xylene mainly into CO ₂ gas and aldehydes such as HCHO and CH ₃ CHO. Since the photocatalyst is generally in a powder form, it may be mixed with a binder to form a photocatalyst coating when the photocatalyst is supported on the substrate. In this case, the binder can function as a binder that prevents scattering and loss of the photocatalyst powder. Examples of the binder include acrylic resin, acrylic silicon resin, oxysilane resin, acrylic silane resin, urethane resin, silicon resin, fluorine resin, polysiloxane, colloidal silica, and titania sol.
[0019]
The VOC removal material of the present invention, the production method thereof, and the aldehyde scavenger used in the VOC removal method are ammonium amidosulfate [NH _4] disclosed in a previous application (Japanese Patent Application No. 9-301712) by the present applicant. SO ₃ NH ₂ ]. This aldehyde scavenger is ammonium amidosulfate [NH ₄ SO ₃ NH ₂ ] May be any of liquid, powder or solid.
[0020]
Examples of the base material that supports or incorporates the photocatalyst and ammonium amidosulfate are based on organic materials such as paper, wallpaper, fiber, cloth, resin, resin film, plastic, and inorganic materials such as tiles. Member.
[0021]
In order to improve the adhesion between the photocatalyst and ammonium amidosulfate and the substrate, a primer may be applied to the substrate before supporting the photocatalyst and ammonium amidosulfate . In this case, the primer applied to the substrate serves as an adhesive layer between the substrate and the photocatalyst layer or ammonium amidosulfate layer, and also serves as a protective layer that prevents the substrate from being eroded by the photocatalyst. Can function. Examples of the primer include acrylic silicon resin, oxysilane resin, acrylic silane resin, urethane resin, silicon resin, water glass, colloidal silica, fluorine-based resin, polysiloxane resin, and cement.
[0022]
<Method of removing VOC>
A VOC existing in an indoor space such as a new building is decomposed and removed as follows according to the present invention.
(1) By irradiating the photocatalyst with light, electrons and holes exhibiting a strong redox action are generated.
(2) Various VOCs such as benzene, toluene and xylene are decomposed into CO ₂ , HCHO, CH ₃ CHO and the like by the redox action of (1).
(3) The aldehyde produced in (2) is converted to stable crystals with ammonium amidosulfate and captured.
[0023]
<< First embodiment of the present invention >>
As shown in FIG. 1, the VOC removal material according to the first embodiment of the present invention uses titanium oxide 1 as a photocatalyst and ammonium amidosulfate 2 as an aldehyde scavenger. Paper is used as the base material 4 supporting the titanium oxide 1 and the ammonium amidosulfate 2. Further, the titanium oxide 1 is mixed with the binder 3 in advance, and a photocatalytic coating is taken.
[0024]
Using the components as described above, a VOC removing material provided with a photocatalyst and ammonium amidosulfate is produced.
[0025]
The method for producing the VOC removal material of the first embodiment of the present invention comprises the following steps.
(i) A photocatalytic coating composed of titanium oxide 1 and binder 3 is applied to paper 4 and dried.
(ii) Liquid ammonium amidosulfate 2 is applied on paper 4 carrying a photocatalyst coating, and dried.
[0026]
The VOC removal material manufactured as described above can be easily removed from the VOC in the room by attaching it to a wall of a new building or the like where the VOC exists, for example, as a wallpaper, or hanging it in the room. be able to.
[0027]
<< Second Embodiment of the Present Invention >>
As shown in FIG. 2, the VOC removal material according to the second embodiment of the present invention uses titanium oxide 1 as a photocatalyst and ammonium amidosulfate 2 as an aldehyde scavenger. A cloth is used as the base material 4 carrying the titanium oxide 1 and the ammonium amidosulfate 2. Further, titanium oxide 1 and ammonium amidosulfate 2 are mixed in advance, and this mixture is further kneaded with binder 3 to form a photocatalytic coating. Further, the primer 5 is used before supporting the titanium oxide 1 and the ammonium amidosulfate 2.
[0028]
Using the components as described above, a VOC removing material provided with a photocatalyst and ammonium amidosulfate is produced.
[0029]
The method for producing the VOC removal material of the second embodiment of the present invention comprises the following steps.
(i) The primer 5 is applied to the cloth 4.
(ii) A photocatalytic coating prepared by mixing titanium oxide 1, ammonium amidosulfate 2 and binder 3 is applied to cloth 4 and dried.
[0030]
Cushion made by using the cloth 4 by sticking the VOC removal material manufactured as described above to the surface of furniture as a sheet in an indoor space such as a new building where the VOC exists, or hanging it indoors. By arranging as a product such as a pillow, the VOC in the room can be easily removed.
[0031]
<< Third embodiment of the present invention >>
As shown in FIG. 3, the VOC removal material according to the third embodiment of the present invention uses titanium oxide 1 as a photocatalyst and ammonium amidosulfate 2 as an aldehyde scavenger. Wallpaper is used as the base material 4 carrying the titanium oxide 1 and the ammonium amidosulfate 2. In addition, titanium oxide 1 is mixed with binder 3 in advance to obtain a photocatalytic coating. Further, the primer 5 is used before supporting the titanium oxide 1 and the ammonium amidosulfate 2.
[0032]
Using the components as described above, a VOC removing material provided with a photocatalyst and ammonium amidosulfate is produced.
[0033]
The method for producing the VOC removal material of the third embodiment of the present invention comprises the following steps.
(i) A primer 5 is applied to the wallpaper 4.
(ii) Liquid ammonium amidosulfate 2 is supported and dried.
(iii) A photocatalyst paint composed of titanium oxide 1 and binder 3 is applied to wallpaper 4 and dried.
[0034]
The VOC removal material manufactured as described above is affixed to a wall as wallpaper 4 in an indoor space such as a new building where the VOC exists, so that the VOC in the room can be easily removed.
[0035]
<< Fourth embodiment of the present invention >>
As shown in FIG. 4, the VOC removal material according to the fourth embodiment of the present invention uses titanium oxide 1 as a photocatalyst and ammonium amidosulfate 2 as an aldehyde scavenger. A tile material is used as the base material 4 carrying the titanium oxide 1 and the ammonium amidosulfate 2. In addition, titanium oxide 1 is mixed with binder 3 in advance to obtain a photocatalytic coating. Further, the primer 5 is used before supporting the titanium oxide 1 and the ammonium amidosulfate 2.
[0036]
Using components such as described above, to produce a VOC removing material having a photocatalyst and Ru amide ammonium sulfate.
[0037]
The method for producing the VOC removal material of the fourth embodiment of the present invention comprises the following steps.
(i) A primer 5 is applied to the tile material 4.
(ii) A photocatalyst paint composed of titanium oxide 1 and binder 3 is applied to tile material 4 to carry it.
(iii) The liquid ammonium sulfate 2 is applied to the tile material 4 supporting the photocatalyst paint in a stacked manner, and the tile material 4 is supported by heating and baking.
[0038]
The VOC removal material manufactured as described above can be simply removed as a tile 4 and attached to a wall or the like to easily remove the VOC in the room.
[0039]
<< Fifth Embodiment of the Present Invention >> As shown in FIG. 5, the VOC removal material according to the fifth embodiment of the present invention uses titanium oxide 1 as a photocatalyst and ammonium amidosulfate 2 as an aldehyde scavenger. Paper is used as the base material 4 into which the titanium oxide 1 is incorporated.
[0040]
Using the components as described above, a VOC removing material provided with a photocatalyst and ammonium amidosulfate is produced.
[0041]
The method for producing the VOC removal material of the fifth embodiment of the present invention comprises the following steps.
(i) Incorporating titanium oxide 1 into paper 4.
(ii) Ammonium amidosulfate 2 is applied to paper 4 incorporating titanium oxide 1 using the above components in liquid form and dried.
[0042]
In addition to such a method, the titanium oxide 1 powder is sandwiched between a plurality of papers 4, the titanium oxide 1 solution is directly applied on the paper 4 and impregnated, or the titanium oxide 1 solution is applied to the paper. For example, the titanium oxide 1 can be incorporated into the paper 4 by spraying directly onto the paper 4.
[0043]
The VOC removal material manufactured as described above can be easily removed from the indoor VOC by, for example, affixing it to a wall as a wallpaper or hanging it in an indoor space such as a new building where the VOC exists. be able to.
[0044]
<< Sixth embodiment of the present invention >>
The VOC removal material according to the sixth embodiment of the present invention is similar to that shown in FIG. 5, and titanium oxide 1 is used as a photocatalyst and amido ammonium sulfate 2 is used as an aldehyde scavenger. A cloth is used as the base material 4 into which the titanium oxide 1 is incorporated.
[0045]
Using the components as described above, a VOC removing material provided with a photocatalyst and ammonium amidosulfate is produced.
[0046]
The method for producing the VOC removal material of the sixth embodiment of the present invention comprises the following steps.
(i) The titanium oxide 1 powder is incorporated into the fiber, twisted, and the cloth 4 is woven using the fiber to incorporate the titanium oxide 1.
(ii) Liquid ammonium amidosulfate 2 is applied to this cloth 4 and dried.
[0047]
In addition to such a method, the photocatalyst powder is sandwiched between a plurality of cloths 4, the titanium oxide 1 solution is directly applied and impregnated on the cloth 4, or the titanium oxide 1 solution is applied to the textile fiber. A method of incorporating the titanium oxide 1 into the cloth 4 by spraying directly on the surface of the fiber to fix the particles of the titanium oxide 1 on the surface of the fiber.
[0048]
Cushion made by using the cloth 4 by sticking the VOC removal material manufactured as described above to the surface of furniture as a sheet in an indoor space such as a new building where the VOC exists, or hanging it indoors. By arranging as a product such as a pillow, the VOC in the room can be easily removed.
[0049]
<< Seventh embodiment of the present invention >>
The VOC removal material according to the seventh embodiment of the present invention is also similar to that shown in FIG. 5, and titanium oxide 1 is used as a photocatalyst and amido ammonium sulfate 2 is used as an aldehyde scavenger. Plastic is used as the base material 4 into which the titanium oxide 1 is incorporated.
[0050]
Using the components as described above, a VOC removing material provided with a photocatalyst and ammonium amidosulfate is produced.
[0051]
The method for producing the VOC removal material of the seventh embodiment of the present invention comprises the following steps.
(i) The powdered titanium oxide 1 is kneaded into the molten plastic 4 and the plastic 4 is cured to incorporate the titanium oxide 1.
(ii) Liquid ammonium amidosulfate 2 is applied to plastic 4 containing titanium oxide 1 and dried.
[0052]
The VOC removal material manufactured as described above can be easily removed by installing the VOC removal material, for example, as a plastic product in the indoor space.
[0053]
In the said embodiment, although the titanium oxide was illustrated and demonstrated as a photocatalyst, you may use a zinc oxide.
[0054]
In the illustrated example of the above embodiment, only the VOC removal material in which both the photocatalyst and ammonium amidosulfate are supported on one side has been described, but these may be supported on both sides of the base.
[0055]
【The invention's effect】
As described above in detail, by the VOC removal method according to the present invention, VOC generated from a new building or the like is rapidly decomposed into CO ₂ and an aldehyde by the oxidation-reduction action of a photocatalyst, and the generated aldehyde is an aldehyde scavenger. It can be easily and efficiently captured by converting into stable crystals with ammonium amidosulfate . Thereby, VOC in the indoor space of a building can be reduced without generating other harmful substances.
[0056]
Further, since the VOC can be removed simply by installing the removing material of the present invention in the indoor space, no electrical means is required for indoor cleaning, and the cooling / heating efficiency is not reduced.
[0057]
Furthermore, since the VOC removal material of the present invention is not so complicated, it can be easily manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing a first embodiment of a volatile organic compound removing material according to the present invention.
FIG. 2 is a schematic longitudinal sectional view showing a second embodiment of a volatile organic compound removing material according to the present invention.
FIG. 3 is a schematic longitudinal sectional view showing a third embodiment of a volatile organic compound removing material according to the present invention.
FIG. 4 is a schematic longitudinal sectional view showing a fourth embodiment of a volatile organic compound removing material according to the present invention.
FIG. 5 is a schematic longitudinal sectional view showing a fifth embodiment of the volatile organic compound removing material according to the present invention.
[Explanation of symbols]
1 Titanium oxide (photocatalyst)
2- Ammonium ammonium sulfate (ammonium salt)
3 Binder 4 Base material 5 Primer

Claims (6)

Decomposing a volatile organic compound that is decomposed to form an aldehyde using a photocatalyst ;
Capturing the aldehyde produced by the step with ammonium amidosulfate ;
Is carried out in the same layer formed on the same substrate . A method for removing a volatile organic compound. A material for removing a volatile organic compound, comprising a substrate comprising a mixture of a photocatalyst that promotes a decomposition reaction of a volatile organic compound that is decomposed to produce an aldehyde, and ammonium amidosulfate . The volatile organic compound remover according to claim 2, wherein the photocatalyst is titanium oxide. A method for producing a material for removing a volatile organic compound , comprising supporting a mixture of a photocatalyst that promotes a decomposition reaction of a volatile organic compound that is decomposed to produce an aldehyde and ammonium amidosulfate on a substrate . The manufacturing method according to claim 4 , wherein a primer is applied to the base material before the mixture is supported on the base material. The manufacturing method according to claim 4 or 5 , wherein the mixture is kneaded with a binder before the mixture is supported on the substrate .

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