JPH07252109A - Antimicrobial far infrared radiating material and radiator - Google Patents

Abstract

PURPOSE:To obtain a radiating material, excellent in emissivity within a wider range of wavelength than that of a conventional far infrared radiating material and having antimicrobial properties together. CONSTITUTION:This antimicrobial far infrared radiating material comprises aluminum silicate and one or two or more metallic oxides selected from the group consisting of silver, copper and zinc. Furthermore, this antimicrobial far infrared radiator contains the radiating material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial far infrared emitting material which emits far infrared rays at a high emissivity and has an antibacterial activity, and an antibacterial far infrared emitting body containing the same.
More specifically, heating, heating, drying, food processing, sterilization,
The present invention relates to an antibacterial far-infrared radiation material and a radiator that can be used in fields such as sterilization and thermotherapy.

[0002]

Far infrared rays generally have a wavelength of 4 to 40 μm.
It is defined as infrared rays in the range of about m and has excellent penetrability to objects, so it is applied to various modes of heating. Further, far infrared rays near room temperature are considered to have a positive effect on the health condition of living organisms because vibrations resonate with the organic compounds that compose living organisms and activate the organisms, which has recently been drawing attention. The former use of heating is found mainly in heaters and dryers used in a wide range of applications, and the latter non-heating use is mainly as a clothing material that comes into contact with the human body.

Many far-infrared radiators made of a ceramic material have been known, for example, zirconia,
Heaters using titania, alumina, and other transition metal element oxide-based ceramics have already been put into practical use.

Specific examples of the raw material used for producing the far infrared radiation ceramic material include oxides disclosed in the following patent documents.

1. Al ₂ O ₃ , SiO ₂ (Japanese Patent Publication No. 53-4
4928) 2. _{ZrO 2, Y 2 O 3,} La 2 O 3, CeO 2 ( JP 5
7-67078) 3. Fe ₂ O ₃ , MgO, BaO (JP-A-61-232
No. 68) 4. SnO _2, Sb ₂ O ₃ (JP 61-1755) 5. TiO ₂ and CuO (JP-A-60-251322) However, although silica and alumina are inexpensive,
Its far-infrared emissivity is low and it cannot exert a sufficient effect.

Further, all of these conventional far-infrared radiation materials require treatment such as drying or sintering at high temperature,
Their production was not industrially advantageous. In addition, in the prior art, there is almost no known material having an emissivity close to that of a black body in the far infrared wavelength range.
"Black body" here is a concept commonly used in physics,
It is an ideal object that completely absorbs all incident light. This black body has a greater ability to radiate energy than any other substance, and the radiative ability of heat (or light) from various objects is compared based on the emissivity of a black body. Further, it is said that a black body emits only infrared rays (0.75 μm or more) at a temperature of 500 ° C. or lower, and only far infrared rays at a temperature of 200 ° C. or lower. For example, Koichi Takada, “Ceramics”, Volume 23, pp. 310-321,
See 988.

On the other hand, it is known that heavy metals (or ions) such as silver, copper and zinc have antibacterial and antifungal actions,
Further, it is also known that these heavy metal compounds are adsorbed on an adsorbing substance such as activated carbon, alumina and silica gel and used for sterilization and disinfection purposes.

An antibacterial aluminum silicate composition capable of freely changing the amount of antibacterial heavy metal ions retained and a method for producing the same are disclosed in Japanese Patent Application Laid-Open No. 4-77311 by the present applicant. However, it has not been known that the antibacterial aluminum silicate composition has far infrared radiation characteristics.

When ceramic materials are used for housing construction materials and health products (including clothing), it is desirable to have both far-infrared radiation and antibacterial properties, but at present, no satisfactory material having both of them has been found.

[0010]

In view of the prior art, it is an object of the present invention to be relatively inexpensive and have a high far-infrared emissivity in a wide wavelength range (that is, the emissivity has a low wavelength dependence).
An object is to provide an antibacterial far-infrared radiation material and a radiator which have excellent radiation properties and also have excellent antibacterial properties.

[0011]

As a result of intensive studies, it was found that an aluminum silicate composition comprising an aluminum silicate salt and a specific metal oxide has desirable antibacterial properties and far infrared radiation properties. I was able to achieve it.

The present invention is directed to aluminum silicate salts and silver,
The gist is an antibacterial far-infrared radiation material composed of one or more metal oxides selected from the group consisting of copper and zinc.

According to the present invention, there is also provided an antibacterial far-infrared emitting material obtained by simultaneously pulverizing aluminum silicate and one or more metal oxides selected from the group consisting of silver, copper and zinc. To be done.

Further according to the invention, 1 selected from the group consisting of aluminum salt (A), silver, copper and zinc.
There is also provided an antibacterial far-infrared emitting material comprising one or more metals or metal salts (B) and an alkali metal silicate (C) which are simultaneously neutralized to obtain the metal aluminum silicate.

In addition, according to the present invention, the ion-exchangeable aluminum silicate salt (D) is made into an aqueous solution (E) of one or more metal salts selected from the group consisting of silver, copper and zinc. There is also provided an antibacterial far-infrared emitting material comprising the metal aluminum silicate obtained by adding and ion-exchanging.

Furthermore, according to the present invention, an antibacterial far-infrared radiation material comprising an aluminum silicate salt and one or more metal oxides selected from the group consisting of silver, copper and zinc is used as an aggregate. Also provided is an antibacterial far-infrared radiator characterized by being formed by adding a binder.

The present invention will be described in detail below.

The method for producing the antibacterial far infrared radiation material of the present invention is as follows:
It can be roughly divided into three methods.

The first manufacturing method comprises a step of simultaneously pulverizing raw materials (aluminum silicate salt, metal oxide) so as to have an appropriate particle size.

The second manufacturing method is to use raw materials ((A), (B),
(C) (three parties) is directly and simultaneously subjected to a neutralization reaction.

The third manufacturing method comprises the step of adding (D) to (E) and carrying out an ion exchange reaction.

In any of the above methods, the obtained product (or reaction product) is appropriately dehydrated, washed, dried,
Further, each step of crushing to obtain an antibacterial far infrared ray emitting material can be added.

As the aluminum silicate salt that can be used in the present invention, an ordinary zeolite-based salt is preferable. For example, natural zeolite (mordenite etc.) and synthetic zeolite (A type zeolite etc.) are illustrated. The "aluminum silicate salt" referred to here also includes aluminum silicate itself. The aluminum silicate salt may be either crystalline or amorphous, and thus the produced metal aluminum silicate salt is either one or a mixture thereof.

The ion-exchangeable aluminum silicate salt (D) which can be used in the present invention contains a metal or ammonium ion having ion-exchangeability in the molecule. Typical ion-exchangeable metals are sodium (Na), potassium (K), lithium (Li), iron (F).
e (II)), magnesium (Mg (II)), calcium (Ca), cobalt (Co (II)), nickel (Ni (II)) and the like.

The aluminum salt (A) that can be used in the present invention includes Al (SO ₄ ) ₃ , Al (NO ₃ ) ₃ ,
AlCl ₃ , Al (CH ₃ COO) ₃ , etc., a water-soluble aluminum salt which may contain a free inorganic acid or organic acid, or Al ₂ (OH) ₃ Cl ₃ , Al ₂ (OH) ₂ (C
Water-soluble basic aluminum salts such as H ₃ COO) ₄ are exemplified. In particular, when used in the second production method, the aqueous solution having a pH of less than 7 (acidic aluminum salt) is preferable.

The metal that can be used in the present invention is selected from the group consisting of silver (Ag), copper (Cu) and zinc (Zn). Therefore, as the metal oxide, M _{2 / n 2} O
(M is the above-mentioned metal, n is a valence of M), and one or more kinds thereof are used. However, other antibacterial heavy metals such as mercury (Hg), tin (Sn), lead (Pb),
Bismuth (Bi), Cadmium (Cd), Chromium (C
r) and the like can also be used in the present invention. Examples of the metal salt that can be used in the second and third production methods include the following inorganic or organic acid salts or metal complex salts.

Cu (SO ₄ ), CuCl ₂ , Cu (N
_{O 3) 2 · 3H 2 O} , Cu (CH 3 COO) 2, [Cu (N
H ₃ ) ₄ ] ²⁺ , Zn (SO ₄ ), ZnCl ₂ , Zn (SC
N) ₂ , Zn (CH ₃ COO) ₂ .3H ₂ O, [Zn (NH
₃ ) ₄ ] ²⁺ , Ag (NO ₃ ) ₃ , Ag (CH ₃ COO),
[Ag (CN) _2] ^- In particular, the metal salt used in the second production method may be a water-insoluble, eg CuO, Zn (OH) ₂ or the like is dissolved when mixed with an aqueous solution of (A) , Cu (S
Since it produces O ₄ ), Zn (SO ₄ ), etc., it can be used. The metal salt used in the third production method is preferably water-soluble.

In the first production method, the aluminum silicate salt preferably has a particle size of 20 to 100 μm. Usually, a metal oxide is used, but even if a metal compound other than an oxide, such as a hydroxide, a sulfate or a nitrate, is used, if these decompose to give a metal oxide, It doesn't matter. The pulverization method is not particularly limited, and examples thereof include a ball mill, a jet mill and a vibrating ball mill. The average particle size of the pulverized particles is preferably 10 μm or less, more preferably 5 μm.
It is the following. If the particle size is larger than this range, the far-infrared emissivity is lowered, and mixing into the raw material is better as the particle size is smaller, and fine particles are desired.

In the second production method, as a reaction method, when (A), (B) and (C) are aqueous solutions, they are separately and simultaneously or in either one or both of them in the stirring water. The mixed aqueous solution of (B) may be charged into a reaction tank and stirred, and the remaining aqueous solutions may be added individually and simultaneously, but when (B) is a salt of an inorganic or organic acid, (A) and (B) are combined. It is preferable to add the mixed aqueous solution and the aqueous solution (C) to the stirred water in the reaction tank because a homogeneous aluminum metal silicate salt can be obtained.

Typically, the aqueous solutions of (A) and (B) are prepared, and then the aqueous solution of (C) whose pH is adjusted with alkali hydroxide is stirred in a predetermined amount of water while stirring. ,
Simultaneously add and neutralize. The obtained gel-like material is filtered,
Wash and dehydrate to a water content of 70-80%. Then 10
It is dried at 0 to 300 ° C. to obtain a metal aluminum silicate salt. Although this may be used as it is as an antibacterial far-infrared radiation material, it is preferably atomized by a conventional means as in the first production method. Metal aluminum silicate salts prepared by this method, equation _{ZM 2 / n O · Al 2} O 3 · YSiO 2
MH ₂ O (wherein M is the metal, n is the valence of M, Z
And Y are positive integers, m is 0 or a positive integer). The conditions for synthesizing the metal aluminum silicate are described in JP-A-4-77311 (page 3, upper right column 2).
The details are disclosed in the second line to the lower right of page 4 (the 20th line).

In the third production method, typically, an aluminum salt and an alkali silicate are reacted under an acidic condition to once generate an alkali aluminum silicate (D), which is then reacted with a metal salt of a desired metal. Ion exchange with
The alkali metal element is replaced with the metal to obtain the metal aluminum silicate salt. The obtained metal aluminum silicate salt is
It can be atomized by conventional means.

The antibacterial far infrared emitting material of the present invention preferably contains the metal as an oxide in an amount of about 1 to about 70% by weight. When the content of metal oxide is less than about 1%,
The composition is close to that of aluminum silicate, and the far infrared ray emissivity is significantly reduced. Also, the content of metal oxide is about 70%
In the above case, the interaction between the metal oxide and silica or alumina in aluminum silicate is weakened, and the far-infrared emissivity becomes close to that of the metal oxide alone, and the desired composite effect cannot be expected. The content of metal oxide is about 20% to about 50
%, The far infrared emissivity is best. Antibacterial action
Since it is almost proportional to the content of the metal oxide, the more the metal oxide is, the more preferable.

Further, the antibacterial far-infrared radiation material of the present invention is preferably composed of a metal aluminum silicate having a composition corresponding to the following in terms of a three component molar ratio expressed as an oxide.

[0034] _{M 2 / n O / Al 2} O 3: about 0.1 to about _{2.0 SiO 2 / Al 2 O 3} : about 2.0 to about 2.4 (M is the metal, n represents M The reason why the antibacterial far-infrared emitting material of the present invention gives an unexpectedly highly efficient far-infrared emitting characteristic is not clear. In the first production method of the present invention, these metal elements are mechanochemically incorporated into the crystal structure of the aluminum silicate salt by grinding in the presence of a specific metal. In the second and third production methods, the metal element is directly incorporated into the crystal structure of the aluminum silicate salt by neutralization or ion conversion. It is considered that this affects the state of the crystal structure and shifts the light emission characteristics to the far infrared side, resulting in highly efficient emission characteristics in a wide wavelength range of far infrared rays.

The antibacterial far-infrared emitting material of the present invention is appropriately processed according to the purpose of use to form an antibacterial far-infrared emitting body. The obtained antibacterial far-infrared radiator comprises an effective amount of antibacterial far-infrared radiator and is applied to various fields such as drying, treatment, heating, food processing, sterilization and sterilization as described above. it can. Therefore, the antibacterial far-infrared radiator formed from the antibacterial far-infrared radiator of the present invention is also within the scope of the present invention.

Table 1 shows typical application fields and expected effects of the antibacterial far-infrared radiation material and radiator of the present invention.

[0037]

[Table 1]

In the above-mentioned application fields, the antibacterial far-infrared radiator of the present invention is used for food packaging (eg cups, bags), clothing, bedding, insoles, heaters (heaters), drying equipment (hair, etc.). Dryer), cookware (eg fish grill), fermenter (eg incubator),
It can be processed into articles such as building materials (eg wall materials, wallpaper).

Further, the antibacterial far infrared ray emitting material of the present invention is
Various bacteria (Gram positive, negative bacteria, mesitylene resistant bacteria)
It has been confirmed by the tests described later that the bactericidal activity against fungi and fungi is excellent. Therefore, it is particularly useful as a food packaging material, clothing, bedding, and housing building material for which antibacterial action is desired.

The processing method according to the purpose of use is known to those skilled in the art. For example, the antibacterial far-infrared radiation material of the present invention is applied as a paint to the material to form an antibacterial far-infrared radiation film, It can be molded as the antibacterial far infrared radiator of the present invention. Typically, the antibacterial far-infrared radiation material of the present invention is atomized to form an aggregate, a suitable binder (water glass, epoxy, fluororesin, etc.), a film modifier (for example, carboxymethyl cellulose) and, if necessary, Add water to make paint. This paint is sprayed onto a wall substrate (mortar or the like) so as to have a desired thickness and dried.

[0041]

The antibacterial far-infrared radiation material of the present invention is synthesized by a physicochemical reaction at around room temperature and heated and dried at a relatively low temperature, so that it consumes less energy in the manufacturing process and can be manufactured at low cost. .

The antibacterial far infrared radiation material of the present invention is
The metal aluminum silicate has excellent far-infrared radiation characteristics due to the interaction between metal and aluminum silicate, and its emissivity approaches that of a black body.

Further, the antibacterial far-infrared radiation material of the present invention has a low content of the antibacterial metal in spite of its high content. That is, it is also an excellent antibacterial material whose antibacterial property continues for a long time.

The present invention will be specifically described below with reference to Examples, Comparative Examples and Test Examples, but the present invention is not limited to these. In Examples and Comparative Examples, weight percentages (%) are used unless otherwise specified.

[0045]

Example 1 Al ₂ (SO ₄ ) ₃ (Al ₂ O) was stirred in a reaction tank filled with water with stirring.
₃ = 8.1%) 397 g and ZnSO ₄ (ZnO = 7.0)
%) 302 g of aqueous solution and sodium silicate (SiO ₂ = 28.5%, Na ₂ O = 9.2%) 109 g
And 756 g of NaOH (Na ₂ O = 9.8%) were simultaneously added to each to simultaneously add them to synthesize a slurry containing aluminum zinc silicate.

Then, the slurry was mixed with SO ₄ ions at 1
It was dehydrated, washed and dried at 200 to 220 [deg.] C. until the content became not more than%. An antibacterial far infrared radiation aluminum zinc silicate having ZnO / Al ₂ O ₃ = 2.0 (molar ratio, the same applies hereinafter) and SiO ₂ / Al ₂ O ₃ = 2.0 was obtained.

Example 2 The aluminum zinc silicate obtained in Example 1 was pulverized by a jet mill to an average particle size of about 5 μm to obtain an antibacterial far infrared radiation aluminum zinc silicate powder product.

Example 3 The aluminum zinc silicate obtained in Example 1 was pulverized with a jet mill to an average particle size of about 2 μm to obtain an antibacterial far infrared ray emitting aluminum zinc silicate fine powder product.

Example 4 Al ₂ (SO ₄ ) ₃ (Al ₂ O under stirring in a reaction tank filled with water.
₃ = 8.1%) 397 g and CuSO ₄ (CuO = 13.
0%) 222 g mixed aqueous solution and sodium silicate (SiO ₂ = 28.5%, Na ₂ O = 9.2%) 133 g
And 728 g of NaOH (Na ₂ O = 9.8%) were simultaneously added to each to simultaneously add them to synthesize a slurry containing copper aluminum silicate.

Next, the slurry was mixed with SO ₄ ions to 1
%, Dehydrated, washed, dried at 200 to 220 ° C., pulverized with a jet mill to an average particle size of about 5 μm, CuO / Al ₂ O ₃ = 0.7, SiO ₂ / Al
_An antibacterial far-infrared radiation aluminum copper silicate powder product with ₂ O ₃ = 2.0 was obtained.

Example 5 Al ₂ (NO ₃ ) ₃ (Al ₂ O under stirring in a reaction tank filled with water.
₃ = 8.0%) 420 g and AgNO ₃ aqueous solution (Ag ₂ O =
15.2%) 69.5 g mixed aqueous solution and sodium silicate (SiO ₂ = 28.5%, Na ₂ O = 9.2%)
An aqueous solution prepared by mixing 58 g and 240 g of NaOH (Na ₂ O = 9.8%) was simultaneously added to synthesize a slurry containing silver aluminum silicate.

Next, the slurry is mixed with NO ₃ ions of 1: 1.
% Or less, dehydration, washing, drying at 200 to 220 ° C., crushing with a jet mill to an average particle size of about 5 μm, Ag ₂ O / Al ₂ O ₃ = 0.1, SiO ₂ / Al
_An antibacterial far-infrared radiation aluminum silicate silver powder product having ₂ O ₃ = 2.0 was obtained.

Example 6 Al (NO ₃ ) ₃ (Al ₂ O) was stirred with stirring in a reaction tank filled with water.
₃ = 10.4%) 490 g of Cu (NO ₃ ) ₂ (CuO =
7.2%) 138 g and AgNO ₃ aqueous solution (Ag ₂ O
= 15.2%) aqueous solution mixed with 38 g and the sodium silicate aqueous solution 237 g and NaOH aqueous solution 8 used in Example 5.
An aqueous solution prepared by mixing 39 g was simultaneously added to synthesize a slurry containing aluminum silicate (copper-silver).

Next, this slurry is added to NO.₃ Ion is 1
To 200-220 ℃, dehydration and washing until
And dry it, and then use a jet mill to reduce the average particle size to approximately 5 μm.
Crushed with CuO / Al₂O₃= 0.2, Ag₂O / Al₂
O₃= 0.1, SiO₂/ Al ₂O₃= 2.25 antibacterial distance
Obtained infrared radiation aluminum silicate (copper-silver) powder
It was

Example 7 To 284 g of an aqueous CuSO ₄ solution (CuO = 7.0%) was added 185 g of the aluminum silicate (unmilled product) obtained in Comparative Example 1, and the mixture was kept under stirring for 5 hours for ion exchange. A slurry containing aluminum copper silicate was synthesized.

Then, this slurry is dehydrated and washed, and
It is dried at 00 to 220 ° C., further ground by a jet mill to an average particle size of about 5 μm, and CuO / Al ₂ O ₃ = 0.
5, SiO ₂ / Al ₂ O ₃ = 2.37 was obtained, which was an antibacterial far infrared radiation aluminum copper silicate powder.

Example 8 Aluminum silicate (unground product) 185 obtained in Comparative Example 1 was added to 276.5 g of an aqueous ZnSO ₄ solution (ZnO = 7.1%).
g was added, and the mixture was kept under stirring for 5 hours to carry out ion exchange to synthesize a slurry containing aluminum zinc silicate.

Next, this slurry is dehydrated and washed, and
It is dried at 00 to 220 ° C., further ground by a jet mill to an average particle size of about 5 μm, and ZnO / Al ₂ O ₃ = 0.
5, a SiO ₂ / Al ₂ O ₃ = 2.37 antibacterial far-infrared radiation aluminum zinc silicate powder product was obtained.

Example 9 159 g of ZnO and 370 g of aluminum silicate powder obtained in Comparative Example 1 were mixed and further pulverized with a jet mill to an average particle size of about 5 μm. ZnO / Al ₂ O ₃ = 2.0, SiO
_An antibacterial far-infrared radiation aluminum zinc silicate powder product having ₂ / Al ₂ O ₃ = 2.37 was obtained.

Example 10 To 150 g of the antibacterial far-infrared radiation material powder of Example 2, 20 ml of water glass (No. 4), 60 ml of water, and 2 g of carboxycellulose were added, and mixed in a pot mill for 2 hours to form a paint,
A wall material having a thickness of 0.3 mm was applied by brushing, dipping, spraying or the like and dried to obtain an antibacterial far infrared radiation wall material.

Reference Example Al (NO ₃ ) ₃ (Al ₂ O) was stirred with stirring in a reaction tank filled with water.
₃ = 8.1%) 769 g and SnCl ₄ (SnO ₂ = 11.1.
5%) 195 g mixed aqueous solution and sodium silicate (SiO ₂ = 28.5%, Na ₂ O = 9.2%) 125 g
And 744 g of NaOH (Na ₂ O = 9.8%) were simultaneously added to each to simultaneously add them to synthesize a slurry containing aluminum tin silicate.

Next, this slurry was mixed with NO ₃ ions of 1
%, Dehydration, washing, drying at 200 to 220 ° C., crushing with a jet mill to an average particle size of about 5 μm, SnO ₂ / Al ₂ O ₃ = 0.5, SiO ₂ / Al
_An antibacterial far infrared radiation aluminum tin silicate powder product having ₂ O ₃ = 2.0 was obtained.

Table 2 shows the weight composition of oxides of the representative examples of the above examples and reference examples.

[0064]

[Table 2]

Comparative Example 400 g of an aqueous NaOH solution (Na ₂ O = 5.1%) was stirred, and an aqueous sodium aluminate solution (Al ₂ O ₃ = 13.
3%, Na ₂ O = 13.1%) 1170 g and sodium silicate aqueous solution (SiO ₂ = 28.5%, Na ₂ O = 9.
2%) 1037 g were added simultaneously. After addition
After continuing stirring for 4 hours, dehydration, washing and drying were carried out until the pH of the washing filtrate became 10.3, and further pulverization with a jet mill to an average particle size of about 5 μm was carried out, and sodium aluminum silicate (0.91Na ₂ O ・ Al ₂ O ₃・ 2.37S
A powder of iO ₂ · 3.88H ₂ O) was obtained.

(Test Example 1) In the examples and comparative examples of the present invention, in order to investigate the far infrared radiation characteristics of the obtained materials, the radiant energy was measured for each wavelength and the emissivity was calculated. 3 shows. The emission spectrum is measured by the Fourier transform infrared spectrometer E500 manufactured by JASCO Corporation.
Mold, measurement conditions are temperature 40 ℃, resolution 1 / 16c
m, the number of integrations was 200, and the detector MCT was set.

[0067]

[Table 3]

Further, the emissivity of the antibacterial far infrared radiation material of Example 3 is shown in FIG.

Test Example 2 Antibacterial Test In order to evaluate the antibacterial activity of the antibacterial far infrared radiation material of the present invention against bacteria and fungi, an antibacterial activity evaluation test was carried out under the following conditions.

(1) Test bacterium Escherichia coli Methicillin-resistant Staphylococcus aureu
s, MRSA) Black mold (Aspergilus nigel) (2) Test method (a) Antibacterial Addition of a sample to sterile ion-exchanged water to prepare a test solution, and the bacterial solution of each test bacteria (Suspended) was added and stored at 30 ° C., and after 6 hours and 24 hours, the viable cell count was measured. The measurement results are shown in Table 4.

(B) Antifungal The test bacterium was inoculated on a potato-dextrose agar plate medium to which the sample was added, culturing was carried out at 27 ° C. for 4 to 30 days, and the growth rate of the bacterium was observed with the inner eye. The observation results are shown in Table 5.

[0072]

[Table 4]

[0073]

[Table 5]

[0074]

As described in Test Example 1 above, the antibacterial far-infrared ray emitting material of the present invention exhibits a high far-infrared ray emissivity in a wide wavelength range as compared with the material of the comparative example, and emits a black body. The brightness close to the brightness is also obtained. Further, the antibacterial far-infrared radiation material of the present invention exhibits an excellent antibacterial action against fungi and bacteria (including MRSA bacteria which is a problem in hospital infection) as described in Test Example 2 above. According to the present invention, an antibacterial far-infrared emitting material having a very good emissivity and antibacterial property, a radiator can be produced at a relatively low cost, and by using these in various application fields, a desired drying property can be obtained. , Heating, treatment, bactericidal effect, etc. can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing the emissivity of an antibacterial far-infrared radiation material of the present invention (Example 3).

Claims (12)

[Claims] 1. An antibacterial far-infrared radiation material comprising an aluminum silicate salt and one or more metal oxides selected from the group consisting of silver, copper and zinc. 2. The antibacterial far-infrared emitting material according to claim 1, wherein the metal oxide is contained in an amount of 1 to 70% by weight. 3. The antibacterial far-infrared emitting material according to claim 2, wherein the metal oxide is contained in an amount of 20 to 50%. 4. The antibacterial far-infrared emitting material according to claim 1, which has a far-infrared emissivity of at least 90%. 5. The antibacterial far infrared radiation emitting material according to claim 1, which is obtained by simultaneously pulverizing an aluminum silicate salt and one or more metal oxides selected from the group consisting of silver, copper and zinc. 6. The antibacterial far-infrared emitting material according to claim 1 or 5, wherein both the aluminum silicate salt and the metal oxide are particles. 7. The antibacterial far-infrared emitting material according to claim 6, wherein the average particle size of the particles is 10 μm or less. 8. The average particle diameter is 5 μm or less.
The described antibacterial far infrared radiation material. 9. M _{2 / n} O / Al ₂ O ₃ : 0.1-2.0 SiO ₂ / Al ₂ O ₃ : 2.0-2.4 (M Is one or more metals selected from the group consisting of silver, copper, and zinc, and n is the valence of the metal)
The antibacterial far-infrared radiation material according to claim 1 corresponding to. 10. A neutralization of at least one of three or more metals or metal salts (B) and an alkali silicate (C) selected from the group consisting of aluminum salts (A), silver, copper and zinc. An antibacterial far-infrared radiation material comprising the metal aluminum silicate obtained by reaction. 11. An ion-exchangeable aluminum silicate salt (D) is added to an aqueous solution (E) of one or more metal salts selected from the group consisting of silver, copper and zinc,
An antibacterial far-infrared radiation material comprising the metal aluminum silicate obtained by ion exchange. 12. An antibacterial far-infrared emitting material composed of an aluminum silicate salt and one or more metal oxides selected from the group consisting of silver, copper and zinc is used as an aggregate and a binder is added, An antibacterial far-infrared radiator characterized by being formed.