JPH04180765A - Air cleaning object - Google Patents

Abstract

PURPOSE:To obtain the air cleaning material which has excellent air cleaning force and can be formed easily by allowing a reaction product of a metal and oxypolybasic acid, etc., to coexist on the metallic surface formed by spraying a specific metal to a porous sheet. CONSTITUTION:A sprayed metal carrying sheet formed by spraying one or two or more metals selected from Fe, Mn, Al, and Zn to a porous sheet is used. As for a method for allowing a reaction product of oxypolybasic acid and the metal to coexist on the metallic surface of the metal sprayed sheet, there is a method by which metal sprayed paper is immersed into a water solution in which the reaction product is generated by allowing the metal and the oxypolybasic acid, etc., to react in advance, and thereafter, dried in the atmosphere and the reaction product of the metal and the oxypolybasic acid, etc., is generated on the sprayed metal surface. The oxypolybasic acid, etc., are ascorbic acid, or an acid being similar to ascorbic acid having an OH base and a COOH base, or an acid obtained by mixing these two kinds or more. As for the acid being similar to the ascorbic acid having an OH base and a COOH base, there are gluconic acid, citric acid, tartaric acid, tannic acid, gallic acid, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to toxic gases such as NO, SOx, 08 gas, and CO gas, nitrogen compound gases such as NH8, and H
, S and other sulfur compound gases, carboxyl group gases such as acetaldehyde, carboxylic acid gases such as acetic acid, and CO2 gas. The air purifying material of the present invention can be used for home use, for example, as a deodorizing agent, and for industrial use, for example, for the purpose of removing combustion exhaust gas or purifying harmful gases.

2. Description of the Related Art Harmful gases in the air are reduced or prevented by using various combustion devices, gas cleaning devices, and chemical treatment devices. However, there is no general method for efficiently removing harmful gases from contaminated air using simple equipment.

Adsorption methods using activated carbon, masking methods using other fragrances, and chemical methods that chemically react odor gases are used to treat bad odors. However, conventional deodorizing agents have a problem in that their deodorizing power deteriorates in a short period of time.

The present inventors have invented a composition in which metals such as iron and manganese are brought into contact with ascorbic acid, etc., so that the reaction product coexists with metals such as iron and manganese, and has filed a patent application in Japanese Patent Application No. 1-280776. did. This air purifying product can be manufactured easily and inexpensively, and its air purifying power hardly deteriorates even when used for a long period of time.

Problems to be Solved by the Invention The present inventors conducted further research on how to easily mold the composition of Japanese Patent Application No. 1-280776 and completed the present invention.

That is, the present invention proposes an air purifying effect and a molded product that has air purifying power equivalent to or even better than the composition of Japanese Patent Application No. 1-280776, and that is easy to mold.

Means for Solving the Problems and Effects The present invention uses a thermal sprayed metal support sheet in which one or more metals selected from Fe, Mn, Al, and Zn are thermally sprayed onto a porous sheet.

Thermal spraying is generally a method of melting metal using arc heating, spraying the molten metal onto a carrier, and coating the carrier with the metal. Generally, the sprayed metal has an extremely dense structural organization.

On the other hand, by improving the flow path of the gas (N2, air, etc.) that sprays the molten metal during thermal spraying, the moment the molten metal adheres to the support, it is cooled by the sprayed gas and the molten metal instantly solidifies. There is a method (Panmetal Engineering K
K-PME thermal spraying method). With this thermal spraying method, it is possible to easily spray metal onto cloth, organic polymers, paper, etc., which have low ignition points, and the sprayed metal structure is extremely porous as shown in Figure 1. It was found that the surface area is large.

This type of thermal spraying method has a problem in that when the carrier is a material with an extremely smooth surface, such as an organic film or glass, adhesion is poor and it easily peels off. For example, in the case of porous materials such as paper, cloth, and fibers, the molten metal inserts roots into the gaps between the fibers constituting the paper, and a structure in which the metal adheres to the paper due to the anchor effect is obtained, which is preferable for the present invention. .

The thickness of the metal layer sprayed in the present invention is 100μ to 1000μ.
is preferred. If it is less than 100μ, the durability of the air purifying power after treatment is insufficient. Moreover, if it is 1000μ or more, workability becomes poor.

The metals used in the present invention are generally used in the form of metal wires, so it is also possible to alloy other metals to make wires, such as Fe, Mn, Al, Zn, etc. Even if other alloying metals are added to the above metals, the air purifying effect is not affected much.

In the present invention, a reaction product of a metal and an oxypolybasic is allowed to coexist on the metal surface of the metal sprayed sheet.

There are mainly two methods for making a reaction product of an oxypolybasic acid and a metal coexist on the metal surface of metal sprayed paper.

(2) A method in which a metal sprayed paper is immersed in a 0.01 to 2 mol oxypolybasic acid aqueous solution, and then dried in the atmosphere to produce a reaction product between the metal and the oxypolybasic acid on the surface of the sprayed metal.

In a solution with a concentration of less than 0.0 mol or less, the acid concentration is too low, making it difficult for the reaction between the metal and the acid to occur, and insufficient reaction products are produced.

Further, if the acid concentration is 3 mo1 or more, the acid concentration is too high, and unreacted oxypolybasic acids remain around the reaction product, which obstructs contact between the reaction product and air, and the cleaning effect is reduced.

■Metal sprayed paper is immersed in an aqueous solution in which metal and oxypolybasic acids are reacted in advance to generate reaction products, and then dried in the air to form reaction products of the metal and oxypolybasic acids on the surface of the sprayed metal. This is the way to do it.

A reaction product of a metal and an oxypolybasic acid can be easily generated in advance by mixing an equimolar solution of a metal powder and an oxypolybasic acid. Although the mixing ratio of metal powder and acid is not limited to equimolar, if there is too much metal powder, undissolved metal will be generated and the metal powder will be wasted, which is not economical.

The air purification mechanism of the present invention consists of adsorption chemical bonding of malodorous gas by the reaction product of a metal, oxypolybasic acid, and oxygen, catalytic reaction of the active metal immediately below the reaction product, and reaction generation through electron transfer from the active metal. Since it is designed to extend the life of the material, it is not preferable to attach the reaction product too thickly to the surface of the sprayed metal. It is preferable to

If it is less than 0.5%, the amount of reaction products will be small and the cleaning rate will be reduced. If it exceeds 5%, it is difficult for electron transfer from the active metal to occur, resulting in a short cleaning life.

In the present invention, oxypolybasic acids refer to ascorbic acid, an acid similar to ascorbic acid having an OH group and a COOH group, or a mixture of two or more of these acids. Examples of acids similar to ascorbic acid having an OH group and a COOH group include gluconic acid, citric acid, tartaric acid, tannic acid, and gallic acid.

Claim (2) of the present invention is an air purifying product obtained by adding iron hydroxide and/or a base to the air cleaning product of claim (1).

Since iron hydroxide acts as a decomposition catalyst for sulfide gases, it is particularly preferred when it is desired to enhance the deodorization of sulfide gases. Further, when a base is further present in the coexistence, the decomposition reaction of H2S-+H++H8-→2H''10S2- is facilitated, and more favorable results can be obtained.Commercially available Fe(OH) is used as iron hydroxide.
z, Pe(OH)a, or alkaline solutions such as NaOH,'Ca(OH)2, Mg(OH)
)2, etc., and FeSO4, PeCl, FeCl2, etc. may be mixed and reacted to produce iron hydroxide.

Bases include Ca(OH)2, NaOH, Mg(OH)
2. A general basic substance such as KOH is added as it is or after being dissolved in an organic solvent.

In the present invention, one or more metals selected from Pe, Mn, Al, and Zn are thermally sprayed onto a porous sheet, and a reaction product of the metal and an oxypolybasic acid and an inorganic acid coexists on the metal surface. urge

Methyl mercaptan (CH2R3) is a type of malodorous gas.
) cannot be reliably removed by reaction products of metals and oxypolybasic acids. However, the present inventors have found that an inorganic acid, for example, H2SO4, has a concentration of 1 to 3 times that of oxypolybasic acids.
It has been found that methyl mercaptan odor removal performance is improved when a metal sprayed sheet is treated with a solution containing HCl, HCl, etc.

Although the mechanism is not certain, it is assumed that the oxidation level of the metal in the reaction product of the oxypolybase and the metal is controlled by the inorganic acid.

The present invention also includes an air-permeable air-purifying product obtained by forming the air-purifying product of claims (1), (2), and (3) into a honeycomb shape.

Since the air purifier of the present invention is made by carrying a thin layer of metal on a sheet by thermal spraying, it is extremely easy to process, increases the contact area with air, and when used as a material with low pressure loss, it can be used as a material shown in Figure 2. It is preferable to make the cleaning material into a honeycomb shape.

When manufacturing a honeycomb-shaped cleaning product, a thermal sprayed metal sheet may be processed into a honeycomb, and even if the thermal sprayed metal sheet is treated with a chemical solution after processing, its cleaning performance will not change.

In the present invention, since a carrier in which metal is sprayed onto a porous sheet is used, the metal is tightly adhered to the porous pores of the sheet, and since the structure of the sprayed metal body is porous, a carrier with an extremely large surface area can be obtained. It will be done.

In addition, since the carrier is a sheet and the sprayed metal is porous, the sprayed metal sheet is not strong and is extremely easy to process. You can get a high rate of air freshener.

Example A metal sprayed sheet was produced by coating corrugated cardboard with Zn and iron to a thickness of 100 to 200 μm on both sides using zinc wire and steel wire using the PME thermal spraying method.

Using this sheet, make a honeycomb shape as shown in Figure 2.
After applying the chemical treatment shown in Table 1, the removal rate of various gases was measured using a passing type measuring device shown in Fig. 3.
Compared to the metal porous body proposed in No. 280776, it can exhibit an air purifying effect with extremely low pressure loss, and has a good H2S removal rate in treatment-2 and a good methyl mercaptan removal rate in treatment-3. I found out what happened.

(Hereinafter, blank spaces) Effects of the Invention As detailed above, the present invention has little pressure loss and is excellent in gas removal rate.

[Brief explanation of drawings]

1 to 3 are cross sections, and FIG. 1 (1) is an example of a general arc sprayed structure, and FIG. 1 (2) is an example of a PME sprayed weave structure. ■... Base material (generally metal), 2... Dense sprayed metal body, 3... Porous sheet, 4... Part of sprayed metal anchor, 5... Porous sprayed metal body, 6... Polybasic acid treated cleaned product, 7... Metal sprayed sheet, 8... Constant concentration gas (200 ppm01 m/sec), 9... Exhaust gas, 10... Residue analysis.

Claims (6)

[Claims] (1) One or two selected from Fe, Mn, Al, and Zn
1. An air purifying product characterized in that a reaction product of the metal and an oxypolybasic acid coexists on the surface of a porous sheet of metal that has been thermally sprayed onto the porous sheet. (2) One or two selected from Fe, Mn, Al, and Zn
It is characterized in that a reaction product of the metal and an oxypolybasic acid is allowed to coexist on the surface of the metal which has been thermally sprayed onto a porous sheet, and then a base or iron hydroxide is further impregnated thereon. Air purifier. (3) One or two selected from Fe, Mn, Al, and Zn
1. An air purifying product characterized in that a reaction product of the metal and an oxypolybasic acid and an inorganic acid coexists on the surface of a metal obtained by thermally spraying a porous sheet with more than one metal. (4) A breathable air purifying product obtained by forming the air purifying product according to claim (1) into a honeycomb shape. (5) A breathable air purifier obtained by forming the air purifier according to claim (2) into a honeycomb shape. (6) A breathable air purifying product obtained by forming the air purifying product according to claim (3) into a honeycomb shape.