JPH11165167A - Tourmaline-containing molding having high activity and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To activate water efficiently by adding tourmaline having permanent electrode properties. SOLUTION: By introducing 20-90% of pores and incorporating a hydrophilic substance, water penetrates into through the pores to come into contact with tourmaline fine particles which are incorporated directly into a molding so that the molding containing tourmaline which can activate water efficiently can be produced. The molding contains 2-300 pts.wt. of tourmaline and 2-300 pts.wt. of silica per 100 pts.wt. of alumina.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

[0001] The present invention relates to a molded article containing tourmaline having permanent electrode properties and a method for producing the same.
In particular, the present invention relates to a molded article for highly exploiting the properties of tourmaline and a method for producing the same.

[0002] The present invention further relates to a coating composition containing tourmaline having permanent electrode properties, or a coating of the composition.

[Prior art]

[0003] Tourmaline, also called tourmaline, is a cyclosilicate mineral having three-coordinated boron, belongs to the trigonal or hexagonal antireciprocal image family, and exhibits an asymmetric image that is vertically asymmetric. The general formula of the chemical composition of the representative one is represented as follows.

[0004] WX3B3Al3 (AlSi209) 3
(O, OH, F) 4 (W = Na, Ca, X = Al, Fe3 +, Li, Mg,
Mn2 +)

It is known that tourmaline has remarkable piezoelectricity and pyroelectricity as electrical characteristics. It is said that tourmaline crystals have positive and negative permanent electrodes at both ends. Therefore, tourmaline has an action of activating water depending on the polarity of the tourmaline, and various uses of the tourmaline have been proposed.

[0006] For example, prevention of red rust in bath and pool water, improvement of transparency, relaxation of chlorine stimulation or drastic reduction of detergents and chelating agents in washing water, improvement of taste in drinking and cooking water, removal of moldy odor, use of activated water Such as promoting plant growth.

[0007] Granules are usually used to treat these waters, and the composition or production method thereof is disclosed as follows.

That is, Japanese Patent Application Laid-Open No. 3-118894 discloses a granular material composed of fine powder of tourmaline and an electrical insulator that insulates and solidifies the fine powder of tourmaline as a granular material.

On the other hand, Japanese Unexamined Patent Publication (Kokai) No. 6-268282 discloses that, in the case where a fine powder of tourmaline is an insulator having an electric resistance higher than that of tourmaline, the effect of tourmaline inside the granular material cannot be brought out. It has been shown that only the effective use of tourmaline significantly reduces the efficiency. As a means for avoiding this, it has been shown that the electric resistance of the carrier needs to be of a semi-good conductor smaller than that of tourmaline, that is, it must have an electric resistance of 10 4 to 10 8 Ω · cm.

【Problems to be solved】

However, it is difficult to accurately adjust the electric resistance within this range, and it is difficult to provide a stable product because the product tends to vary. Further, even when the electric resistance of the carrier is adjusted, the tourmaline present inside the granular material only indirectly comes into contact with water, and exchanges electrons through the carrier, so that the efficiency also decreases. Therefore, it is desired to provide a highly efficient tourmaline-containing molded body by another method instead of adjusting the electric resistance.

Further, in the case of a coating film, a tourmaline powder is usually added to an organic paint such as acrylic or epoxy to form a film. In this case, the tourmaline powder is buried in the organic paint film and comes out on the surface. The efficiency is poor because only the part that works is effective. Accordingly, it is desired to provide a coating composition for activating water more efficiently and a coated body using the same.

[Means for Solving the Problems]

In view of such circumstances, as a result of intensive studies, the introduction of a specific amount of pores and the addition of a hydrophilic substance allow water to penetrate through the pores and directly mix into the interior. The present inventors have found that water can be efficiently activated by contact with tourmaline fine particles regardless of the electric resistance of the tourmaline carrier, and the present invention has been completed.

That is, the present invention is a molded article containing 2 to 300 parts by weight of tourmaline with respect to 100 parts by weight of alumina, and the pore volume ratio of the molded article is 20 to 90% of the volume of the entire molded article. The present invention provides a tourmaline-containing molded article having high activity.

In the present invention, 2-300 parts by weight of tourmaline and 2-300 parts by weight of silica are used based on 100 parts by weight of alumina.
A tourmaline-containing molded article having high activity, characterized in that the molded article contains parts by weight, and the molded article occupies 30 to 80% of the molded article as a pore volume ratio.

Further, the present invention provides a tourmaline-containing molded article having high activity, wherein the molded article has a specific surface area of 30 to 500 m ² / g.

The present invention also provides a tourmaline-containing molded article having high activity, wherein the alumina is an alumina containing 0.05 to 0.5% by weight of Na2O.

The present invention also provides a tourmaline-containing molded article having high activity, wherein the above-mentioned alumina is an intermediate alumina and / or an alumina mainly composed of hydrated alumina.

Further, the present invention provides a tourmaline-containing molded article having high activity, in which tourmaline is a tourmaline powder having an average particle diameter of 0.2 to 10 μm.

The present invention further provides a tourmaline-containing molded article having high activity, wherein the silica is silica formed of colloidal silica.

On the other hand, according to the present invention, tourmaline powder having an average particle diameter of 0.2 to 10 μm is added to 100 parts by weight of intermediate alumina and / or alumina hydrated with intermediate alumina.
３００300 parts by weight, and while continuously supplying the mixture, continuously spraying water containing 0.5 to 50% by weight of colloidal silica in terms of silica, and granulating by a dish-type tumbling granulation method. The product is dried and fired at 100 ° C. or more and 800 ° C. or less, and the pore volume ratio is 30 to 80 times the volume of the entire molded body.
% Molded body and / or specific surface area of 30 to 500 m ² /
The present invention also provides a method for producing a tourmaline-containing molded article having high activity, characterized in that the molded article is a molded article of g.

Further, the present invention relates to a method for preparing 100 parts by weight of intermediate alumina and / or alumina hydrated from intermediate alumina and 2 to 30 parts of tourmaline powder having an average particle diameter of 0.2 to 10 μm.
0 parts by weight of colloidal silica in terms of silica;
Provided is a composition for producing a tourmaline-containing molded article or a coating composition, which comprises part by weight and water.

The present invention also relates to 100 parts by weight of intermediate alumina and / or alumina hydrated with intermediate alumina, 2 to 300 parts by weight of tourmaline powder having an average particle diameter of 0.2 to 10 μm, and 1 to 100 parts by weight of colloidal silica in terms of silica. Parts, 2-30 parts in terms of solid content of acrylic resin emulsion
A composition for producing a tourmaline-containing molded article or a coating composition comprising 0 parts by weight and water.

The present invention also provides a tourmaline-containing coating obtained by coating the above coating composition on a substrate selected from the group consisting of metal, concrete, ceramics, glass, wood and plastic.

Tourmaline has piezoelectricity and surface potential, so if it is brought into contact with it, the plus and minus will be neutralized, and its effect will be significantly reduced. Alternatively, a semiconductive carrier is used in combination. As the tourmaline powder, one selected and pulverized from a tourmaline-containing ore can be used. Average particle size is usually 0.2 to
10μ.

The alumina powder used in the present invention also has a purpose as a carrier for preventing the tourmaline powder from coming into contact with each other, but the main purpose is to provide the alumina itself as a binder and to provide hydrophilicity by the action of the surface OH group. The purpose of the present invention is to impart the property or to increase the pore amount described later. Further, when alumina containing 0.05 to 0.5% of Na2O is used, the hydrophilicity can be further enhanced.

Particularly preferred aluminas used for this purpose are intermediate aluminas and / or aluminas hydrated. Intermediate alumina is generally alumina before it becomes α-alumina, and forms such as γ, δ, η, ρ, χ, and θ are known. Since these are easily hydrated and are bound by a hydration reaction, they also function as a binder. Further, it is characterized in that micropores are easily formed by the dehydration reaction and the specific surface area is increased.

Examples of such an intermediate alumina include hydraulic alumina, for example, hydraulic alumina such as BK-103 or BK-112 manufactured by Sumitomo Chemical Co., Ltd. In addition, it is possible to produce a molded article having high strength by mixing an aqueous colloidal silica dispersion and molding and curing. Those having an average particle diameter of 1 to 20 μm are preferably used. Hydraulic alumina binds by a hydration reaction, so that it is possible to impart strength to a molded article without using a binder that has a high possibility of inhibiting the properties of tourmaline. Also, since bonding is performed at a low temperature, 900
There is no need to perform sintering at a temperature close to ° C., the control of pores is easy, and it is possible to manufacture at low cost.

The silica particles used here are used for imparting hydrophilicity to the molded article. That is, it is necessary that the water to be treated permeate quickly into the interior in order to effectively utilize the interior as well as the surface of the molded body. And high hydrophilicity are desired. Silica has its surface covered with OH groups and thus tends to be hydrophilic, which meets this purpose. Therefore, the silica having hydrophilicity is required to be at least smaller than the particle size of alumina from the purpose of uniformly dispersing the inside of the molded article, and usually, the particle having a particle size of 1/10 or less of the particle size of alumina powder is used. Preferably, the silica particles have a diameter.

The silica particularly preferably used for this purpose is colloidal silica (silica sol), and its particle size is in the range of 0.002 to 0.1 μm. In addition, when colloidal silica is used, an effect as a binder can be expected, so that the pore volume can be easily controlled while maintaining the strength of the molded body. Further, when the above-mentioned hydraulic alumina and colloidal silica are used in combination, the bonding force also increases synergistically, so that the effect becomes remarkable, which is particularly preferable.

For the purpose of further increasing the strength, an acrylic resin emulsion can be added for use. Examples of acrylic resin emulsions include Movinyl series of acrylic copolymer resin emulsions manufactured by Hoechst Gosei Co., Ltd. Among them, Movinyl 800 which is a composite particle emulsion with colloidal silica is particularly preferred.
The 0 series is particularly preferred.

A composition containing such alumina, tourmaline, colloidal silica, and an acrylic resin emulsion, if necessary, is molded into a molded article. As a forming method, it can be formed by a rolling granulation method, an extrusion granulation method, an extrusion molding method, a slip casting method, or the like. In this way, in addition to spherical bodies having a diameter of 0.5 mm to 10 mm, various shaped bodies such as spherical bodies, rod-shaped bodies, columnar bodies, honeycomb structures, and Rahi-siling shaped bodies of various sizes are obtained. Can be.

In order to produce granules and spheres at low cost, a dish-shaped tumbling granulation method can be used. As such a dish-shaped tumbling granulator, a conventional one can be used, for example, the one having the appearance shown in FIG. 1 of JP-A-7-68148 can be mentioned.

As the physical properties required for such a molded article, the pore volume ratio of the molded article is 20 to 90%, preferably 30 to 8%.
0%. If the pore volume ratio is less than 20%, the effect is not sufficient, and if it is more than 90%, the strength is extremely low, and the powder becomes unsuitable for use and cannot be used.

The specific surface area of the molded product is 30 to 500 m ^2.
/ G, preferably from 50 to 400 m ² / g, more preferably from 100 to 400 m ² / g. The specific surface area indicates the effective surface inside the molded body, and the larger the value, the more effective, but if it is too large, the average diameter of the pores becomes too small, so that the permeation of water is inhibited, and the overall effect is reduced. Not preferred.

These pores and specific surface areas can be controlled by heat treatment after molding. Usually 100
℃ to 900 ℃, preferably 100 ℃ to 8
Baking at a temperature of 00 ° C. or less. If the temperature is too low, the pores or the specific surface area is too small to be sufficient. However, in the case of hydraulic alumina, the pores and the specific surface area are large since the heat treatment is once performed at 500 ° C. to 800 ° C. for a short time, and the heat treatment after molding is not essential.

On the other hand, hydraulic alumina and colloidal silica are mixed using water as a medium, and the mixture is molded at 200 ° C.
Hereinafter, it has been found that an alumina molded article having extremely high strength can be obtained by firing at a low temperature of 100 ° C. or less. Further, it has been found that a molded product having higher strength can be obtained by mixing a hydraulic alumina, colloidal silica and an acrylic resin emulsion with water as a medium to form a molded product.

If these are applied, it can be applied not only to the production of tourmaline-containing molded products but also to the production of alumina molded products of relatively large and complicated shapes by low-temperature firing.

That is, the present invention relates to a hydraulic alumina powder 10
0 parts by weight of colloidal silica was converted to a solid content of 20 parts by weight.
Provided is a composition for a molded article obtained by mixing -100 parts by weight with an aqueous medium, and a method for producing a high-strength alumina molded article by using the composition.

Further, the present invention relates to a hydraulic alumina powder 100
10 parts by weight of colloidal silica in terms of solids
Provide a composition for a molded article in which 100 parts by weight of an acrylic resin emulsion is mixed with an aqueous medium in an amount of 10 to 100 parts by weight in terms of solid content, and provide a method for producing a high-strength alumina molded article by using the composition. I do.

On the other hand, as inorganic coatings, coatings using water glass, aluminum phosphate and the like as binders are commercially available. However, if these materials are not fired at 250 ° C. or more, they have poor water resistance and cannot be put to practical use. Means cannot be taken and its use is narrowed.

Further, when colloidal silica is used as a binder, water resistance can be imparted by firing at a low temperature of about 150 ° C., but the adhesion is not sufficient.

When the above-mentioned composition for producing a molded article of the present invention is used as a coating, a coating film having good adhesion can be obtained by firing at a low temperature. The paint composition as a tourmaline-containing composition,
When used as a paint, a tourmaline-containing coating can be produced, and the coating can be a highly active tourmaline-containing coating similar to a molded article.

That is, the present invention provides an intermediate alumina and / or
Alternatively, colloidal silica is added in an amount of 10 to 10 in terms of solid content based on 100 parts by weight of the alumina powder in which the intermediate alumina is hydrated.
0 parts by weight, 1 in terms of solid content of acrylic resin emulsion
A coating composition comprising 0 to 100 parts by weight mixed with an aqueous medium is provided.

The present invention also relates to a method for preparing 100 parts by weight of intermediate alumina and / or alumina hydrated with intermediate alumina and a tourmaline powder having an average particle diameter of 0.2 to 10 μm in a range of 2 to 300 parts.
Provided is a composition for producing a tourmaline-containing molded product or a coating composition, which comprises 3 parts by weight, 3 to 200 parts by weight of colloidal silica in terms of silica, and water.

Further, the present invention relates to 100 parts by weight of intermediate alumina and / or alumina hydrated with intermediate alumina and 2 to 30 parts of tourmaline powder having an average particle diameter of 0.2 to 10 μm.
0 parts by weight, colloidal silica is 1 to 100 in terms of silica.
2 parts by weight of acrylic resin emulsion in terms of solid content
Provided is a composition for producing a tourmaline-containing molded article or a coating composition comprising 300 parts by weight and water.

The present invention further provides a tourmaline-containing coating obtained by coating the above-mentioned coating composition on a substrate selected from the group consisting of metal, concrete, ceramics, glass, wood and plastic.

[0047]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. The pore volume ratio was determined from the weight, volume, and true specific gravity of the molded body or the spherical body by the following equation. That is, pore volume ratio (%) = (volume− (weight / true specific gravity)) /
Volume × 100. The specific surface area was measured by a usual BET specific surface area measurement method.

Regarding the degree of activity, about 15 g of a molded body or a spherical body per liter of water was used using goldfish breeding water in a water tank, and the transparency of the water was observed. As another method of evaluating the activity, radish was cultivated indoors and its growth was observed.

[0049]

Example 1 30 parts by weight of a commercially available tourmaline powder having an average particle diameter of about 3 μm and 70 parts by weight of a commercially available hydraulic alumina powder having an average particle diameter of about 12 μm were mixed well. 60 parts by weight of a 20% solution of 20 parts by weight of colloidal silica dispersed as SiO2 in 80 parts by weight of water was added and kneaded well to obtain a composition. Next, this composition was slip-cast into a polyethylene container having a diameter of 3 cm to a height of about 0.5 cm. After curing at about 1 daily temperature, 1 more
It baked at 50 degreeC for 1 hour. The obtained molded body had a pore volume ratio of 45% and a specific surface area of 170 m ² / g. The evaluation is shown in Table-3.

[0050]

Example 2 30 parts by weight of a commercially available tourmaline powder having an average particle diameter of about 3 μm and 70 parts by weight of a commercially available hydraulic alumina powder having an average particle diameter of about 2.4 μm were mixed well to obtain a mixed powder. In addition, colloidal silica was added to 75 parts by weight of water
Colloidal silica 25 dispersed as 25 parts by weight as O2
% Solution was added and kneaded well to obtain a composition. Water is added as required, and the composition is molded by hand to a diameter of about 8 mm.
Spherical body. The obtained spherical body was cured at a daily temperature of about 1 day, and then fired at 200 ° C. for 1 hour. The obtained spherical body has a pore volume ratio of 54% and a specific surface area of 160 m ² / g.
Met. The evaluation results are shown in Table-3.

[0051]

Example 3 20 parts by weight of a commercially available tourmaline powder having an average particle diameter of about 3 μm and 70 parts by weight of a commercially available hydraulic alumina powder having an average particle diameter of about 12 μm were mixed to form a mixed powder. In addition, colloidal silica was added to 80 parts by weight of water
45 parts by weight of a 20% solution in which 5 parts by weight of O2 and 15 parts by weight of an acrylic resin were dispersed were added and kneaded well to obtain a composition. Water was added as necessary, and the composition was molded by hand to form a sphere having a diameter of about 8 mm. The obtained sphere was cured at about daily temperature and then fired at 200 ° C. for 1 hour. The obtained spherical body has a pore volume ratio of 35% and a specific surface area of 130 m.
² / g. The evaluation results are shown in Table-3.

[0052]

Examples 4 to 9 The amount of tourmaline powder, the amount of hydraulic alumina powder and the amount of colloidal silica were changed.
A molded body was obtained in the same manner as in Example 1 except that the molded body was fired under various firing conditions. This is shown in Tables 1 and 2 as Examples 4 to 9. In this table, TM means tourmaline powder, AL
Is hydraulic alumina powder, CS is colloidal silica 20
% Solution.

[0053]

[Table-1]

The physical properties of the obtained spherical body are shown in the following table.

[Table-2]

[0055]

Example 10 30 parts by weight of a commercially available tourmaline powder having an average particle diameter of about 3 μm and 70 parts by weight of a commercially available hydraulic alumina powder having an average particle diameter of about 2.4 μm were thoroughly mixed. This powder was poured into a dish granulator (dish diameter 1 m, rotation 18 rpm, tilt angle 50).
A solution in which 20 parts by weight of colloidal silica was dispersed as SiO 2 with respect to 80 parts by weight of water was poured into the dish portion of ゜) while supplying it at a supply amount of 120 parts by weight / Hr with a powder feeder. The injection amount was an average of 70 parts by weight / Hr. The obtained molded body was a spherical body having a diameter of 3 to 4 mm. This was cured in saturated steam at 100 ° C. for about 20 hours and fired at 400 ° C. The volume ratio of the pore is 6
At 5%, the specific surface area was 250 m ² / g.

[0056]

Comparative Example 1 10 parts by weight of the same tourmaline powder as used in Examples 1 to 10, 40 parts by weight of alumina powder, 40 parts by weight of borosilicate glass, and 10 parts by weight of a clay-based sintering aid were mixed. It was granulated and fired at 950 ° C. for 3 hours to obtain a spherical body having a diameter of about 4 mm. The pore volume ratio of the obtained spherical body was less than 20%, and the specific surface area was less than 1 m ² / g. In addition,
When the sintering temperature was 700 ° C. or less, particularly 500 ° C. or less, sintering was insufficient and the powder was easily powdered, so that it could not be put to practical use.

[0057]

[Table-3] The spherical bodies and molded bodies of the examples and comparative examples shown here were tested, and their activities were examined. In addition, the evaluation method evaluated the transparency of water and the maintenance period. A blank indicates a state in which no treatment agent is used. Here, ◎ is very transparent, 〇 is transparent but ◎
△ indicates a case where transparency is slightly lower, △ indicates a case where turbidity is observed, and X indicates a case where turbidity is large.

[0058]

[Table-4] Using samples of Examples and Comparative Examples similar to those in Table 3 above,
Kiware radish was cultivated indoors and evaluated. Specifically, a tourmaline-containing substance was put in water, and seeds of radish were immersed in the water, observed from germination to growth, and the final height was compared and used as an index. As apparent from these results, it is shown that the final growth degree is improved by 20 to 50% as compared with the blank. On the other hand, the comparative example was 10% or less.

[0059]

EXAMPLE 11 The composition shown in Example 3 was applied to a 10 cm × 10 cm stainless steel plate by adjusting the viscosity with water and cured at room temperature for about one day. The film thickness after curing was about 0.6 mm. Then, it was baked at 150 ° C. for 1 hour. The obtained film had good adhesion and was strong. This coating was applied to Examples 1-1.
The same evaluation as 0 was performed. As a result, almost the same results as in Example 3 were obtained, and it became clear that the effect of activating water was similarly observed in the coating.

[0060]

Example 12 100 parts by weight of a commercially available hydraulic alumina powder having an average particle diameter of about 12 μm and 80 parts by weight of a 20% solution of 20 parts by weight of colloidal silica dispersed as SiO 2 in 80 parts by weight of water were added and kneaded well. Then, a composition was obtained. The composition was then slip cast to a height of about 2 cm in a polyethylene container having a diameter of 2 cm.
After curing at about 1 day temperature, it was further baked at 150 ° C. for 1 hour. Further, as a comparative sample, only water was used instead of the colloidal silica solution, and the other components were the same in composition and slip-cast by the same method, and fired at 150 ° C. for 1 hour.
The crushing strength was about 3.2 times as compared with the comparative sample.

[0061]

Example 13 A 20% solution of 100 parts by weight of a commercially available hydraulic alumina powder having an average particle size of about 12 μm, 5 parts by weight of colloidal silica as 80 parts by weight of water and 80 parts by weight of SiO2, and 15 parts by weight of an acrylic resin was dispersed. 80 parts by weight were added and kneaded well to obtain a composition. The composition was then slip cast to a height of about 2 cm in a polyethylene container having a diameter of 2 cm. After curing at about 1 day temperature, it was further baked at 150 ° C. for 1 hour. The crushing strength was about 6.8 times that of the comparative sample similar to that of Example 1.

[0062]

As described above, according to the present invention, a tourmaline powder and an alumina powder, preferably an intermediate alumina powder, are mixed to form a compact, and the pore volume ratio of the compact is 20% or less.
By adjusting the content to 90%, preferably 30% to 80%, a highly active tourmaline-containing molded article can be obtained without controlling the electric resistance.

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Claims (13)

[Claims] 1. A molded article containing 2 to 300 parts by weight of tourmaline with respect to 100 parts by weight of alumina, and the pore volume of the molded article is 20 to 90% of the volume of the entire molded article. Highly active tourmaline-containing molded article. 2. A molded article containing 2 to 300 parts by weight of tourmaline and 2 to 300 parts by weight of silica with respect to 100 parts by weight of alumina, and the molded article has a pore volume ratio of 20 to 90% of the molded article. A highly active tourmaline-containing molded article characterized by comprising: 3. The tourmaline-containing molded article having high activity according to claim 1, wherein the pore volume ratio occupies 30 to 80% of the molded article. 4. The molded article has a specific surface area of 30 to 500 m ² /
g. The tourmaline-containing molded article having high activity according to any one of claims 1 to 3. 5. The method according to claim 1, wherein the alumina is 0.05 to 0.5% Na2O.
The tourmaline-containing molded article having high activity according to any one of claims 1 to 4, which is alumina containing the same by weight. 6. The tourmaline-containing molded article having high activity according to any one of claims 1 to 5, wherein the alumina is an alumina mainly composed of intermediate alumina and / or hydrated alumina. 7. Tourmaline having an average particle size of 0.2 to 10 μm.
The tourmaline-containing molded article having high activity according to any one of claims 1 to 6, which is a tourmaline powder of m. 8. The tourmaline-containing molded article having high activity according to claim 2, wherein the silica is silica formed of colloidal silica. 9. The highly active tourmaline-containing molded article according to claim 8, further comprising an acrylic resin emulsion. 10. To 100 parts by weight of intermediate alumina and / or alumina hydrated with intermediate alumina, 2 to 300 parts by weight of tourmaline powder having an average particle diameter of 0.2 to 10 μm are mixed, and the mixture is continuously supplied. While continuously spraying water containing 0.5 to 50% by weight of colloidal silica in terms of silica, granulation is performed by a dish-type tumbling granulation method, and then the granulated material is dried and fired at 100 ° C or more and 800 ° C or less, A method for producing a tourmaline-containing molded article having high activity, wherein the molded article has a pore volume ratio of 30 to 80% of the total volume of the molded article and / or a molded article having a specific surface area of 30 to 500 m ² / g. . 11. Intermediate alumina and / or 100 parts by weight of alumina hydrated with intermediate alumina, having an average particle size of 0.1.
A composition for producing a tourmaline-containing molded product or a coating composition, comprising 2 to 300 parts by weight of 2 to 10 μm tourmaline powder, 3 to 200 parts by weight of colloidal silica in terms of silica, and water. 12. Intermediate alumina and / or 100 parts by weight of alumina hydrated with intermediate alumina, having an average particle size of 0.1.
2 to 300 parts by weight of a tourmaline powder of 2 to 10 μm, 1 to 100 parts by weight of colloidal silica in terms of silica, 2 to 300 parts by weight of an acrylic resin emulsion in terms of solids, and water. A composition for body production or a composition for coating. 13. A tourmaline-containing coating obtained by coating the coating composition according to claim 11 or 12 on a substrate selected from the group consisting of metal, concrete, ceramics, glass, wood and plastic.