JP2005262179A - Water treatment chemical and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a water treatment chemical which has a shape like a porous body formed by using powdered sulfur, a large surface area and excellent sterilizing power, and to provide a method for manufacturing the water treatment chemical. <P>SOLUTION: Powdered sulfur, hydrophilic inorganic powder like calcium carbonate, clay or talc and a binder like rubber latex or a resin emulsion are blended with one another, and granulated. The sulfur-containing porous body is obtained by heating the obtained granulated material rapidly while keeping the powdered sulfur in an unmelted state so that the required amount of the moisture held by the binder is boiled/removed. It is preferable that the powdered sulfur, the hydrophilic inorganic powder of 20-80 wt.% of the powdered sulfur and the binder of 20-40 wt.% of the total amount of the powdered sulfur and the hydrophilic inorganic powder are blended and mixed with one another. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water treatment agent, particularly a water treatment agent suitable for sterilization of non-drinkable industrial or consumer water, and a method for producing the same.

  The fact that sulfur ions and colloidal sulfur in water have a bactericidal power has been known for a long time because sulfur springs are effective for skin diseases. However, it is unsuitable as a treating agent for industrial water or the like to be circulated when such ultrafine particles of sulfur are introduced into water.

Patent Document 1 (Japanese Patent Laid-Open No. 2000-176460) describes that single sulfur has a bactericidal effect against Legionella bacteria, and “a water treatment agent composition characterized by containing single sulfur as an active ingredient. (Claim 8) "," A member for sterilizing Legionella bacteria characterized in that simple sulfur is immobilized on a support (Claim 9) ". In the same document, “An antibacterial composition formulated with various additives and containing simple sulfur as an active ingredient may be added to an aqueous system. (0047)”, and “impregnation of simple sulfur is a simple substance. Sulfur is dissolved in a solvent such as chloroform to form a simple sulfur solution, and a fibrous material, a porous material, etc. are immersed in the solution, and then dried, for example, by a relatively simple operation. The filter for sterilization can be obtained by impregnating a simple sulfur solution with a filter, ceramic filter, pumice, etc., and drying. (0057) ”.
However, in the preparation such as the former, sulfur is contained in the preparation. As in the latter case, when elemental sulfur is melted and adsorbed onto a substance having a porous space such as pumice, the sulfur penetrates into the space and solidifies when the melting point is lowered. Such sulfur significantly reduces the surface area and reduces the bactericidal effect.

JP 2000-176460 A

  The present invention has been made in consideration of the above-mentioned problems of the prior art, and has a form of a porous body using powdered sulfur, a water treatment agent having a large surface area and excellent sterilizing power, and a method for producing the same. The purpose is to provide.

The water treatment agent according to the present invention is formed by mixing powdered sulfur, at least a hydrophilic inorganic powder, and a binder in a homogeneous state to form a porous body.
In the present invention, the inorganic powder is preferably composed of one or more of calcium carbonate, clay and talc.
In the present invention, the binder is preferably manufactured using rubber latex or resin emulsion.
In the present invention, the porous body may be a granular material. Moreover, such a porous body has a particle size of 1 to 5 mm and a filling density (measured by a 1 l graduated cylinder method according to JIS R 3505) of 0.5 to 0.7 g / cm ³ . Some are preferred.
The porous body may be formed in a plate-like body or a plate-like body held on a support.
In the present invention, the porous body preferably further comprises synthetic or natural short fibers.

The method for producing a water treatment agent according to the present invention relates to a method for producing a water treatment agent as described above, so that powder sulfur, at least a hydrophilic inorganic powder and a binder are blended to be uniform. By mixing and granulating, the resulting granulated product is rapidly heated while maintaining the state that the powdered sulfur does not melt, and the moisture retained by the binder is removed in the boiling state to remove the sulfur-containing porous material. A body is obtained.
Further, a mixture obtained by blending powder sulfur, at least a hydrophilic inorganic powder and a binder so as to be uniform is formed into a plate-like body or held on a support to form a plate-like body Of the water treatment agent to obtain a sulfur-containing porous body by rapidly heating the powder sulfur while maintaining the state in which the powdered sulfur is not melted, and removing the moisture held by the binder in a required amount in a boiling state. It is a manufacturing method.
In the above method for producing a water treatment agent, 20 to 80% by weight of inorganic powder hydrophilic to powder sulfur and 20 to 40% by weight of binder to the total amount of these powders are blended. It is preferable to do this.
Further, it is preferable to mix powder sulfur, at least a hydrophilic inorganic powder, a binder, and a synthetic or natural short fiber so as to be uniform. In this case, 20-80% by weight of inorganic powder hydrophilic to powdered sulfur, 1-5% by weight of synthetic or natural short fibers, and 20-40% by weight of binder with respect to the total amount are blended. It is preferable to mix.
Furthermore, in the manufacturing method of the said water treatment agent, what the water content removed in a boiling state is 40 to 60% of the water content before a heating is preferable.

The water treatment agent according to the present invention is formed by mixing a powdery sulfur, at least a hydrophilic inorganic powder and a binder in a homogeneous state to form a porous body, and the powdered sulfur remains as it is. Since the porous body is formed by adhering to the hydrophilic inorganic powder through the binder, there are many exposed portions of sulfur, so that the surface area can be prevented from decreasing, and the hydrophilic inorganic powder works to absorb water. Therefore, it is effective for ionization of sulfur located inside the porous body, and can exhibit a good sterilizing effect.
In addition, the inorganic powder can be manufactured at low cost using easily available materials by being made of one or more of calcium carbonate, clay, and talc.
What was manufactured using rubber latex or resin emulsion as a binder can be manufactured safely at low cost using an easily available material.

The porous body having a granular form is easy to handle and can be applied to various uses. In particular, the porous material has a particle size of 1 to 5 mm and a packing density (measured by a 1 l graduated cylinder method according to JIS R 3505) of 0.5 to 0.7 g / cm ^3. It is relatively light and easy to handle and has practical strength.
The porous body is formed of a plate-like body or a plate-like body held by a support, and is a replacement part or a module for a water treatment agent for a humidifier or other device. It is useful to configure as a separate part.

  When the porous body further comprises synthetic or natural short fibers, when used as a water treatment agent, the porous body absorbs water to the inside of the porous body due to capillary action of the short fibers and is located inside the porous body. Sulfur ionization can be promoted.

According to the method for producing a water treatment agent of the present invention according to claims 8 and 9, the porous inorganic material is mixed with the hydrophilic inorganic powder and the binder in a homogeneous state in a form in which the powder sulfur is not melted. A water treatment agent having a large surface area and excellent sterilizing power can be obtained by a simple method.
The obtained porous body is in the form of a granular material, which is easy to handle and can be applied to various uses. What is formed into a plate-like body or a plate-like body held by a support in the form of the porous body to be obtained is a replacement part, a modularized part, for a water treatment agent for a humidifier and other devices. Useful to make up.
According to the method for producing a water treatment agent according to claim 10, 20 to 80% by weight of the inorganic powder hydrophilic to the powder sulfur, and 20 to 40% by weight of the binder with respect to the total amount of these powders. In practice, a sulfur-containing porous body having a relatively large surface area and mechanical strength as a porous body can be obtained.
According to the method for producing a water treatment agent according to claim 11, powder sulfur, at least a hydrophilic inorganic powder, a binder, and a synthetic or natural short fiber are blended and mixed so as to be uniform. A sulfur-containing porous body comprising synthetic or natural short fibers, and when used as a water treatment agent, water is absorbed to the inside of the porous body by capillary action of the short fibers, and is located inside the porous body A water treatment agent capable of promoting sulfur ionization is obtained.
According to the water treatment agent according to claim 12, 20 to 80 wt% of inorganic powder hydrophilic to powder sulfur, 1 to 5 wt% of synthetic or natural short fibers, and a binder to these total amount By mixing and mixing with 20 to 40% by weight, a sulfur-containing porous body having a relatively large surface area, water absorption and mechanical strength as a porous body can be obtained.
According to the water treatment agent of the thirteenth aspect, the moisture content to be removed in a boiling state is 40 to 60% of the moisture content before heating, so that a relatively large surface area and machine as a porous body can be obtained. A sulfur-containing porous body that has both mechanical strength and strength is obtained.

First, the water treatment agent according to the present invention will be described.
The water treatment agent according to the present invention is formed by mixing powdered sulfur, at least a hydrophilic inorganic powder, and a binder in a homogeneous state to form a porous body. The powdered sulfur does not melt and adheres to the hydrophilic inorganic powder through the binder as it is, thereby forming a porous body as a whole. Since there are many exposed portions of sulfur, a decrease in surface area can be avoided, and the porous body makes it easy for water to penetrate into the interior. Although sulfur is hydrophobic, it has a water-absorbing action due to the hydrophilic inorganic powder, so that it is effective for ionization of sulfur located inside the porous body, and can exhibit a good sterilizing effect. The water treatment agent according to the present invention can be easily produced by the method for producing a water treatment agent according to the present invention.
The water treatment agent according to the present invention includes, for example, industrial water such as cooling water, cold / hot water, heat storage water, and water for biological growth, as well as sterilization of consumer water such as circulating bath water, pool water, and humidifier water. Suitable for use.

  Powdered sulfur in the present invention is simple sulfur, and its purity is preferably higher, but is not particularly limited. Powdered sulfur obtained from liquid sulfur extracted in the crude oil refining process or one obtained from hot springs containing sulfur can be used. Although the magnitude | size of powder sulfur is not specifically limited, The thing of 100-600 mesh is preferable at points, such as handleability and availability. Those having a particle size smaller than this are difficult to produce by mechanical pulverization, so there is no commercially available product, and those having a particle size larger than this tend to have a reduced surface area of the sulfur particles and the performance tends to deteriorate.

The hydrophilic inorganic powder in the present invention is not particularly limited as long as it has hydrophilicity, but it is preferable to use one or more of calcium carbonate, clay and talc. As other inorganic powders, for example, calcium silicate can be used. In particular, calcium carbonate is preferred. This is because, in water, it reacts with sulfate ions generated from powdered sulfur to become calcium sulfate that is insoluble in water, and acidification of water can be prevented.
In addition, although the magnitude | size of inorganic powder is not specifically limited, Usually, it is about 100-500 mesh, Preferably it is about 300-500 mesh.

The binder adheres powdered sulfur and hydrophilic inorganic powder to each other. The water treatment agent according to the present invention is preferably produced using a rubber latex or a resin emulsion as a binder. As rubber latex, styrene butadiene rubber latex, chloroprene rubber latex, etc. can be used, for example. As the resin emulsion, acrylic resin, acrylic / styrene, urethane / acrylic, and the like can be used. Of these, acrylic resins are preferably used in terms of water resistance and aging resistance.
The blending ratio of powdered sulfur, hydrophilic inorganic powder and binder will be described in the water treatment agent according to the present invention described later.

The porous body constituting the water treatment agent according to the present invention has a structure having many fine pores, and the form is not particularly limited. It can be formed into an appropriate form by itself or in an appropriate form in a form attached to a support. Usually, as a form, it is easy to use what was formed in the granulated material or the plate-shaped object, and is easy to manufacture.
A porous body having a granular form is easy to handle and can be applied to various uses. The size and shape of the granular material can be set to the most suitable size and shape in consideration of its use and the like, and is not limited. For example, the granulated material is preferably a cylindrical shape having a diameter of 1 to 2 mm and a length of 1 to 2 mm, or a diameter of 3 to 5 mm and a length of about 3 to 5 mm, depending on the shape of the inorganic powder. It may be indefinite.
In particular, a granular material having a particle size of 1 to 5 mm and a filling density (measured by a 1 liter graduated cylinder method according to JIS R 3505) of 0.5 to 0.7 g / cm ³ is relatively lightweight. It is preferable because it is easy to handle and has practical strength.

  Moreover, as a porous body which makes a plate-shaped body, it shall be formed in the plate-shaped body or the plate-shaped body hold | maintained at the support body. That is, a plate-like body is formed with a single porous body, or is laminated on a thin plate-like (for example, sheet-like or net-like) member such as a filter cloth or a stainless steel screen and held on a support. It can be formed into a plate-shaped body. Of course, the support may be in any form that can hold the porous body in a plate shape, and is not limited to a plate-like (for example, sheet-like or net-like) member. The porous body is formed into a plate-like body or a plate-like body held by a support, and is configured as a replacement part or a modular part for a water treatment agent for a humidifier or other device. It is beneficial to.

In the water treatment agent according to the present invention, the porous body preferably further comprises synthetic or natural short fibers. That is, the water treatment agent according to the present invention is formed by mixing a powdered sulfur, at least a hydrophilic inorganic powder, a binder, and a synthetic or natural short fiber in a homogeneous state to form a porous body. Those are preferred. When the porous body further comprises synthetic or natural short fibers, when used as a water treatment agent, it is in contact with water or water, and the terminal short fibers are porous due to capillary action. Can absorb water up to the inside of the porous body and have an effective role in ionization of sulfur located inside the porous body.
Synthetic short fibers include acrylic fibers, polyester fibers, and other synthetic fibers, and natural short fibers include natural fibers such as cotton and hemp.

Next, a method for producing a water treatment agent according to the present invention (a method for producing a water treatment agent as described above) will be described.
The method for producing a water treatment agent according to the present invention comprises powdered sulfur, at least a hydrophilic inorganic powder and a binder, mixed and granulated so as to be uniform, and the resulting granulated product, A sulfur-containing porous body is obtained by rapidly heating while maintaining a state in which powdered sulfur does not melt, and removing a required amount of water held by the binder in a boiling state.
The mixing of powdered sulfur, hydrophilic inorganic powder and binder is preferably carried out using a kneader, but the apparatus for mixing is not limited to this, and can be mixed uniformly. If so, other devices such as a stirrer may be used. After mixing, granulate with a granulator. You may mix and granulate simultaneously using the apparatus which can perform mixing and granulation simultaneously.

  In the method of the present invention, the requirement for rapid heating while maintaining a state where powdered sulfur does not melt is that the melting point of sulfur is 118 ° C. Therefore, if the heating time is gradually increased and the heating time is lengthened, the sulfur melts. This is because the initial powder form is damaged and a large surface area cannot be maintained. Since a sulfur-containing porous body having good performance as a water treatment agent can be obtained by rapidly heating while maintaining a state in which powdered sulfur does not melt and removing the moisture held by the binder in a required amount and boiling. is there. When the moisture retained by the binder is gradually removed by gentle heating, a porous form cannot be obtained.

  In the case where the porous body is formed into a plate-like body or a plate-like body held by a support, powder sulfur, at least a hydrophilic inorganic powder and a binder are blended. The mixture obtained by mixing in a uniform manner is formed into a plate-like body or held on a support to form a plate-like body, which is rapidly heated while maintaining a state in which powdered sulfur does not melt. Then, a required amount of water retained by the binder is removed in a boiling state to obtain a sulfur-containing porous body. In this case, the granulation process is eliminated.

  In the method for producing the water treatment agent, 20-80% by weight of inorganic powder hydrophilic to powder sulfur and 20-40% by weight of binder with respect to the total amount of these powders are mixed and mixed. It is preferable to do this. As a result, a sulfur-containing porous body having a relatively large surface area and mechanical strength as a porous body in practice can be obtained. The rubber latex or resin emulsion used as a binder usually has a solid content of 40 to 60% by weight. A preferable composition of the sulfur-containing porous body is composed of 100 parts by weight of powdered sulfur, 20 to 80 parts by weight of hydrophilic inorganic powder, and 10 to 25 parts by weight of a binder.

When the water treatment agent is formed by mixing powder sulfur, at least a hydrophilic inorganic powder and a binder, and further synthetic or natural short fibers in a homogeneous state to form a porous body, Powder sulfur, at least hydrophilic inorganic powder, binder, and synthetic or natural short fiber are blended and mixed uniformly to form a granulated product or plate-like body. A sulfur-containing porous body is obtained by rapidly heating while maintaining a state in which powdered sulfur does not melt and removing a required amount of water held by the binder in a boiling state.
In this case, 20-80% by weight of inorganic powder hydrophilic to powdered sulfur, 1-5% by weight of synthetic or natural short fibers, and 20-40% by weight of binder with respect to the total amount are blended. By mixing, a sulfur-containing porous body having a relatively large surface area, water absorption, and mechanical strength as a porous body can be obtained.

The heating means used in the method of the present invention is performed by, for example, an air oven or a heating / drying machine (the heat source is siliconit, an infrared bulb, etc.), and is not particularly limited, but heating using an air oven removes water from boiling. It is preferred because it is suitable for rapid heating to perform.
Moreover, about heating conditions, it is preferable to heat in 150-200 degreeC air oven. If the heating temperature is lower than this, water will gradually evaporate, making it difficult to form a porous material. Moreover, when heating temperature is higher than this, as above-mentioned, sulfur will melt | dissolve easily.
Heating using this air oven is performed such that the temperature of the granulated product or plate-like body at the outlet of the air oven is 115 ° C. or lower by passing through the air oven at 150 to 200 ° C. with a conveyor. Is desirable. In this case, the time for passing through the oven is preferably about 10 to 20 seconds.
By heating in an air oven at 150 to 200 ° C., more preferably, the heating using this air oven is allowed to pass through the air oven at 150 to 200 ° C. and granulated at the outlet of the air oven Or by heating so that the temperature of a plate-shaped object may be 115 degrees C or less, a sulfur containing porous body can be obtained efficiently in a short time avoiding melting of powder sulfur.
About 1/2 of the water in the rapidly heated porous body is removed by boiling. After passing through the oven, the remaining water may be dried and removed by residual heat. Alternatively, it may be dried at an appropriate temperature of less than about 110 ° C.

In the method of the present invention, the amount of water to be removed in a boiling state is preferably 40 to 60% of the amount of water before heating. Thereby, a sulfur-containing porous body having a relatively large surface area and mechanical strength as a porous body is obtained.
If the amount of water is less than that after boiling removal, the porous body is too porous and weak in mechanical strength when used, and the porous body may collapse in water. When there is too much water content after boiling removal, it is difficult to ensure a large surface area as a porous body. The amount of moisture removed in the boiling state was measured by the following method.
First, the moisture content of the sample mixture (granulated product) before heating is measured. Since the moisture content of inorganic powders such as powdered sulfur and calcium carbonate is 0.1% or less according to the standard, the moisture content immediately after the completion of mixing is mostly the moisture content of the binder used. Since the amount of water contained in the inorganic powder such as calcium carbonate is practically negligible, it was calculated based on the weight (water content) of the binder.
Next, 10 g of the sample mixture (granulated material) immediately after mixing is taken up in aluminum foil, taken out immediately after passing through the air oven, left in a constant temperature and humidity chamber at 20 ° C. and 60% humidity, and then weighed. The amount of evaporated water during passage through the oven was calculated from the weight loss. After that, after drying for 2 hours at 105 ° C. in an electric dryer, the sample is left in a desiccator for 20 minutes to completely remove the remaining water, and weighed in that state, and the total weight is removed from the weight. It was confirmed that the water content was almost the same as the initial water content. The fact that most of the water evaporated in the air oven was removed in a boiled state means that the granulated product was directly dried at 105 ° C. or less without being heated rapidly as described above. It is understood from the fact that it appears as a difference in density.

  By the production method according to the present invention described above, a water treatment agent having a large surface area and excellent sterilizing power in the form of a sulfur-containing porous body using powdered sulfur can be obtained. This is formed by mixing powder sulfur, hydrophilic inorganic powder, and a binder in a homogeneous state to form a porous body, and is suitably used as a water treatment agent.

Powdered sulfur (200 mesh, manufactured by Tsurumi Chemical Co., Ltd.) 50 parts by weight Calcium carbonate 25 parts by weight 50% acrylic resin emulsion 20 parts by weight After kneading the above blend with a kneader, a granulator (Dalton Co., Ltd., disk) The pellets were granulated to a diameter of 3 mm and a length of 5 mm, and immediately placed on a conveyor and fed into a 180 ° C. air oven, and after 15 seconds, they were taken out of the oven. Although the initial moisture content was 10.5%, the moisture content immediately after passing through the oven was 5.2%. It is understood that most of the difference 5.3% of the water was removed in a boiling state. The moisture content was measured according to the measurement method described above.
What was obtained above and further dried at 100 ° C. or lower had a packing density (g / cm ³ ) of 0.51, whereas the granulated product was used as it was without heating rapidly as described above. The packing density (g / cm ³ ) of the product dried at a temperature of 0 ° C. or lower was 0.63.

Powdered sulfur (500 mesh, manufactured by Tsurumi Chemical Co., Ltd.) 50 parts by weight Clay 30 parts by weight 50% chloroprene latex 20 parts by weight After kneading the above compound with a kneader, a granulator (manufactured by Dalton, disk pelleter) ) And granulated to 5 mm in diameter and 5 mm in length, and immediately placed in a 200 ° C. air oven on a conveyor for 10 seconds and taken out of the oven. The moisture content before drying was 10%, but the moisture content immediately after passing through the oven was 5.2%. It is understood that most of the difference 4.8% of the water was removed in a boiling state. The moisture content was measured according to the measurement method described above.
Packing density that obtained by the above (g / cm ³⁾ whereas 0.51, packing density but was dried below as 100 ° C. The granulation (g / cm ³⁾ is 0.63 Met.
The packing density (g / cm ³ ) of the product obtained by the above drying at 105 ° C. or lower was 0.52, whereas the granulated product was used as it was without heating rapidly as described above. The packing density (g / cm < ³ >) of what was dried below [deg.] C was 0.60.

Powdered sulfur (300 mesh, manufactured by Tsurumi Chemical Co., Ltd.) 50 parts by weight Talc 25 parts by weight 45% acrylic resin emulsion 20 parts by weight After kneading the above blend with a kneader, granulator (Dalton, disk pellet) And then granulated to a diameter of 3 mm and a length of 3 mm, immediately placed in a 180 ° C. air oven on a conveyor for 15 seconds and taken out of the oven. The moisture content before drying was 11.6%, but the moisture content immediately after passing through the oven was 5.8%. It is understood that most of the difference 5.8% of the water was removed in a boiling state. The moisture content was measured according to the measurement method described above.
What was obtained above and further dried at 105 ° C. or lower had a packing density (g / cm ³ ) of 0.53, whereas the granulated product was directly used without being heated rapidly as described above. The packing density (g / cm < ³ >) of what was dried below [deg.] C was 0.66.

Powdered sulfur (200 mesh, manufactured by Tsurumi Chemical Co., Ltd.) 50 parts by weight Calcium carbonate 40 parts by weight 45% acrylic resin emulsion 20 parts by weight After kneading the above blend with a kneader, a granulator (Dalton Co., Ltd., disk) The pellets were granulated to a diameter of 3 mm and a length of 3 mm, then immediately placed in a 150 ° C. air oven on a conveyor for 20 seconds and taken out of the oven. The moisture content before drying was 10.0%, but the moisture content immediately after passing through the oven was 5.2%. It is understood that most of the difference 4.8% of the water was removed in a boiling state. The moisture content was measured according to the measurement method described above.
The packing density (g / cm ³ ) of the product obtained above by further drying at 105 ° C. or lower was 0.50, whereas the granulated product was used as it was without heating rapidly as described above. The packing density (g / cm < ³ >) of what was dried below [deg.] C was 0.67.

Powdered sulfur (300 mesh, manufactured by Tsurumi Chemical Co., Ltd.) 50 parts by weight Talc 25 parts by weight 45% acrylic resin emulsion 25 parts by weight The above blend is mixed uniformly with a mixer, and the thickness is 0.5 mm. A silicone-treated release paper is placed on a metal plate, and the mixture is placed on a thickness of 2 to 3 mm. A 10-mesh polyester filter cloth was placed thereon, the mixture was further placed thereon to a thickness of 2 to 3 mm, a release paper and a metal plate were covered in that order, and pressed at a pressure of about 10 g / cm ² . At this time, the filter cloth is bonded together with the upper and lower mixtures by the binder to form a three-layered plate-like body sandwiching the filter cloth. The upper metal plate and release paper were removed, and the sheet was fed into a 180 ° C. air oven, and taken out of the oven after 15 seconds.
The initial amount of water was 13.75%, but 2.25% of the water evaporated during the production of the plate (working was performed at 25 ° C. and 60% RH). Since the amount was 11.5% and the amount of water immediately after passing through the air oven was 6.5%, it can be understood that most of the difference of 5.0% was removed by boiling. The moisture content was measured according to the measurement method described above.

Powdered sulfur (300 mesh, manufactured by Tsurumi Chemical Co., Ltd.) 50 parts by weight Talc 25 parts by weight Cotton short fiber (5 mm in length) 2 parts by weight 45% acrylic resin emulsion 25 parts by weight The silicone-treated release paper is placed on a metal plate having a thickness of 0.5 mm, and the mixture is placed on a thickness of 3 to 5 mm. A release paper and a metal plate were placed thereon in that order and pressed at a pressure of about 10 to 15 g / cm ² . The upper metal plate and release paper were removed, and the sheet was fed into a 180 ° C. air oven, and taken out of the oven after 15 seconds.
Although the initial moisture content was 13.48%, 1.48% moisture evaporated during the work before heating (work was conducted at 25 ° C. and 60% RH). The amount was 12.0%. Since the moisture content immediately after passing through the air oven was 6.0%, it can be understood that most of the difference of 6.0% was removed by boiling. The moisture content was measured according to the measurement method described above.
While the embodiments and examples of the present invention have been described above, the present invention is not limited to the above-described ones, and can be appropriately added and modified within the scope of the gist of the present invention.

Claims (13)

  A water treatment agent obtained by mixing powder sulfur, at least a hydrophilic inorganic powder, and a binder in a homogeneous state to form a porous body.   The water treatment agent according to claim 1, wherein the inorganic powder is composed of one or more of calcium carbonate, clay, and talc.   The water treatment agent according to claim 1, wherein the water treatment agent is produced using a rubber latex or a resin emulsion as the binder.   The water treatment agent according to any one of claims 1 to 3, wherein the porous body has a granular form. The porous body has a particle size of 1 to 5 mm and a packing density (measured by a 1 l graduated cylinder method according to JIS R 3505) of 0.5 to 0.7 g / cm ^3. Item 5. A water treatment agent according to Item 4.   The said porous body is a water treatment agent in any one of Claims 1-3 formed in the plate-shaped body by which the form was hold | maintained at the plate-shaped body or the support body.   The water treatment agent according to any one of claims 1 to 6, wherein the porous body further comprises a synthetic or natural short fiber.   Powder sulfur, at least a hydrophilic inorganic powder and a binder are blended and mixed to be uniform and granulated, and the resulting granulated product is rapidly heated while keeping the powder sulfur from melting. And the manufacturing method of the water treatment agent in any one of Claims 1-5 which obtains a sulfur containing porous body by removing the water | moisture content which a binder hold | maintains in a required amount and a boiling state.   A mixture obtained by mixing powder sulfur, at least a hydrophilic inorganic powder, and a binder so as to be uniform is formed into a plate-like body or held on a support to form a plate-like body. Then, this is rapidly heated while maintaining the state in which powdered sulfur does not melt, and the moisture content retained by the binder is removed in a boiling state to obtain a sulfur-containing porous body, 6. A method for producing a water treatment agent according to 6.   The inorganic powder having hydrophilicity with respect to powder sulfur is mixed in an amount of 20 to 80% by weight, and the binder is mixed in an amount of 20 to 40% by weight with respect to the total amount of these powders. A method for producing a water treatment agent.   The method for producing a water treatment agent according to claim 8 or 9, wherein powdered sulfur, at least a hydrophilic inorganic powder, a binder, and further synthetic or natural short fibers are blended and mixed so as to be uniform.   20 to 80% by weight of inorganic powder hydrophilic to powder sulfur, 1 to 5% by weight of synthetic or natural short fibers, and 20 to 40% by weight of binder with respect to the total amount are mixed and mixed. The manufacturing method of the water treatment agent of Claim 11.   The manufacturing method of the water treatment agent in any one of Claims 8-12 whose water content removed in a boiling state is 40 to 60% of the water content before a heating.