JP3396057B2 - Molded adsorbent that is not a paper sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded adsorbent which is not a paper sheet used for adsorbing and removing coloring substances, odorous components and other harmful substances contained in a gas phase or a liquid phase.
It relates to a method of manufacture.

[0002]

2. Description of the Related Art As a conventional molded adsorbent that is not a paper sheet (hereinafter also simply referred to as a "molded body"), a hot-melt synthetic resin is used as a binder, and activated carbon is obtained by heat-melting the synthetic resin. A structure having a structure in which they are bonded (adhered) to each other has been known. And this thing was manufactured as follows. That is, for example, in the case of a molded product containing fibrous activated carbon as a main component, 10 to 25% by weight of a heat-meltable synthetic resin is mixed with the total weight of the molded product to prepare a uniform aqueous slurry. After dipping the mold in the liquid and stacking a certain amount of solid content on the mold surface by suction method and removing from the liquid, dehydration treatment is performed to obtain a wet (wet) shaped product, which is then removed from the mold. By taking out and heating to a predetermined temperature, the binder is heat-melted to bond and dry the activated carbons.

[0003]

However, in the above technique, the shape-retaining strength is extremely low at the stage of the wet shaped body, and when it is gripped by hand, deformation or shape is required unless it is done very carefully. There was a difficulty in handling, such as the collapse. Therefore, there has been a problem that the production efficiency or the yield is poor accordingly. Meanwhile, in order to increase the handling strength, increasing the proportion of binder, the
As a result, the water permeability and the adsorption capacity of the molded adsorbent which is not a paper sheet are deteriorated. Further, since the activated carbons are bonded to each other by heating and melting to a predetermined temperature, a heating and melting step (production facility) is required. Moreover, polyvinyl alcohol (P
VA), polyethylene, polypropylene, polyester, etc., in any case, the shrinkage of the molded article after drying is as large as 10 to 15%, and therefore the paper sheet
There is also a problem in that it is not possible to expect high precision in the dimensions of molded adsorbents (products) that are not sheets.

Under these circumstances, the inventor of the present application found out the following facts when various samples were manufactured using various materials as the binder for the molded body containing activated carbon as a main component. That is, in the case where an appropriate amount of fibrillated aramid fiber is used as a binder and activated carbon is bonded by the entanglement of the fiber, the wet (wet) strength of the molded article is extremely high, and further, after drying. It was found that the shrinkage also stopped within a few percent, the dimensional stability was extremely high, and the strength after drying (product) was also high. When aramid fibers that were not fibrillated were used as the binder, the strength was low both when wet and when dry, and there was a significant problem in shape retention. The present invention has been devised based on these findings in order to solve the problems of the above-mentioned conventional techniques, and has high wet strength and dry strength as well as excellent dimensional stability .
A molded adsorbent that is not a paper sheet, with a relatively low proportion of binder.
It is an object of the invention to provide a manufacturing method that can be obtained .

[0005]

Was to achieve the above object, there is provided a means for solving]
Therefore, the invention according to claim 1 comprises activated carbon as a main component.
A shaped adsorbent that is not a shaped paper sheet,
The activated carbon using brilled aramid fiber as a binder
Manufacture a shaped adsorbent that is not a paper sheet made by combining
In the method, an aqueous slurry containing the activated carbon and the binder.
To prepare a predetermined amount of solid content in this aqueous slurry,
Laminated on the mold surface by suction method, and then dehydrated
To form a wet shaped body, and then the wet shaped body
The shape is dried, and the activated carbon is removed by the entanglement of the binder.
It is characterized by being combined. In addition, according to claim 2,
Invention, a paper sheet comprising a molded activated carbon as a main component
Non-formed adsorbent, fibrillated aramid
Paper made by combining the above-mentioned activated carbon with the dough fiber as a binder.
A method for producing a molded adsorbent not over preparative, the active
Prepare an aqueous slurry containing the charcoal and the binder,
Immersing the mold in a water-soluble slurry to determine the solid content on the mold surface
The amount of the solid content is laminated on the mold surface by the suction method.
The mold is taken out of the aqueous slurry, dehydrated, and demolded.
To form a wet compact, and then the wet compact
Dry the body and bind the activated carbon with the entanglement of the binder.
It is characterized by combining. And, according to claim 3,
The invention is directed to the binding which forms the shaped adsorbent that is not the paper sheet.
The material is not the paper sheet except the binder,
It is characterized by being 1 to 10% by weight with respect to the weight.
Manufacture of a molded adsorbent which is not the paper sheet according to claim 1 or 2.
Is the way. Further, the invention according to claim 4 is the paper sheet.
The molded adsorbent that is not a sheet is the adsorbent of the water purifier.
The paper sheet according to claim 1, 2 or 3
It is a method of manufacturing a shaped adsorbent. Further, according to claim 5,
The invention relates to the above-mentioned activity forming a shaped adsorbent that is not the paper sheet.
Granular activated carbon is contained in charcoal, and the particle size of the granular activated carbon is
Characterized by having a thickness of 0.18 to 0.36 mm
A molding sheet which is not the paper sheet according to claim 1, 2, 3 or 4.
It is a method for manufacturing a body. In the present invention, fibrillation
The term means that the unit (filament) of the aramid fiber has a fine dendritic structure that is easily entangled with each other. in this case,
The fibrillated aramid fiber is based on the total weight of the molded adsorbent which is not a paper sheet excluding this aramid fiber,
Yo When 0.5 to 15% by weight Iga, preferably 1 to 1
It is good to set it to 0% by weight.

[0006]

According to the present invention, since the aramid fiber as the binding material has activated carbon bonded by the entanglement due to its dendritic structure, the binding force or the shape retention in the wet shaped article is obtained. Its strength is high, and its strength is retained even when it is dried. Therefore, the handling (handling) is good, and the production efficiency can be improved accordingly. Further, since the fibrillated aramid fiber has a function of aggregating substances such as activated carbon in the aqueous slurry, the molded product is homogenized, and therefore, high quality product is expected. Further, since it has a structure in which the fibers are bound together by entanglement, it can be obtained by drying at a relatively low temperature. Therefore, the process (equipment) can be simplified, the manufacturing cost can be reduced, the shrinkage due to drying can be reduced, and a molded product with high dimensional stability can be obtained. Furthermore, since the aramid fiber does not usually heat-melt and has a thermal decomposition starting temperature of 400 ° C. or higher, a molded product excellent in heat resistance can be obtained.

The binding material, that is, the aramid fiber, in the present invention has a strong binding force because it is fibrillated, and therefore the amount used (composition ratio) is higher than that in the case of the conventional bonding by heat melting. the can significantly less, relative to the total 100 wt.% activated carbon and other additives, can be about 0.5 to 15 wt.%, paper Sea
The water-passing performance and adsorption capacity of the molded adsorbent, which is not a standard, was also enhanced. Moreover, the aramid fiber is different from organic substances such as pulp and hemp, and is excellent in water resistance such that it is unlikely to cause decay and shape loss due to it even when used in water (wet state), and therefore, the present invention, It is particularly suitable as an adsorbent (filter) for a water purifier. Furthermore, the aramid fiber has properties such as extremely high heat resistance and excellent wet heat resistance. Therefore, there is no problem even when regenerating (activating) by applying and passing high temperature steam to the molded body to separate and remove the adsorbate, which is suitable for extending the life of the molded body. Is. In addition, aramid fiber is also excellent in solvent resistance,
It is also suitable as a molded article for solvent adsorption.

[0008]

EXAMPLES Examples embodying the present invention and manufacturing methods thereof will be described in detail. The molded adsorbent, which is not the paper sheet of this example , is one in which the activated carbon is a mixture of granular activated carbon and fibrous activated carbon, and an antibacterial material is added as an additive. The composition) and the compounding ratio are as follows. However, the molded adsorbent which is not a paper sheet in this example is for a water purifier and is formed in a hollow cylindrical shape.
Outer diameter is 65 mm, wall thickness is 15 mm, and length is 250
It is set to mm. That is, the granular activated carbon is a coconut shell type activated carbon mainly composed of micropores and has a particle size of 0.18.
˜0.36 mm, specific surface area 1550 m ² /
g or more. By the way, this product has a high ability to adsorb odorous components and the like, and is suitable for water purifiers. In addition, the fibrous activated carbon is a coal pitch type in this example,
Fiber thickness is 10 μm to 15 μm and specific surface area is 1500
m ² / g or more, and the length is adjusted to about 0.5 mm. It should be noted that this is relatively inexpensive as fibrous activated carbon, has high adsorption performance (velocity), and is also granular (powder).
It is capable of adsorbing substances having a molecular size smaller than activated carbon. The antibacterial material is antibacterial zeolite (powder) in which antibacterial metal ions are added to zeolite. This product is suitable for water purifiers because it has a function of preventing the growth of bacteria in the residual water of the molded product and has high safety. The mixing ratio (weight) in this example is 4
It is set to 5:45:10 (wt%).

On the other hand, the binder in this example, that is, the fibrillated aramid fiber, is
It is a meta type having a developed fine dendritic structure, and the diameter (width) of the particles is distributed in the range of 1 to 200 μm, and the length is adjusted to an average of 1 to 3 mm. However, this amount is set to 5% by weight with respect to the total weight described above (the total weight of the molded body excluding the aramid fiber) in this example.

Thus, the material thus prepared is sequentially poured into water stored in a pulper with stirring to form an aqueous slurry, which is then sent to a slurry concentration adjusting tank to adjust the amount of water, A uniform aqueous slurry having a concentration of 0.5% is prepared, and if necessary, an appropriate additive material (chemical agent) is added and the mixture is sent to a molding tank. In this process, the fibrillated aramid fiber has a function of coagulating the activated carbon and the antibacterial material in the slurry. Then, a predetermined molding die is dipped in the slurry in the molding tank, a predetermined amount of solid content is laminated on the mold surface by a suction (vacuum molding) method, taken out from the liquid, dehydrated, and removed from the mold. Then, a wet shaped body is obtained. The thus obtained wet-shaped molded article in this example has activated carbon bonded by entanglement of fibrillated aramid fibers and retains its shape, so that the handling strength is extremely high and deformation or demolding occurs. There was almost no deformation, and it was extremely easy to handle. By the way, next, this wet shaped body was dried at a predetermined temperature, in this example at 100 ° C., for 3 hours. Thus,
From the state in which activated carbon was bound by the entanglement of aramid fibers, it was possible to obtain a high-strength dry shaped body in which only water was removed by evaporation, that is, a shaped adsorbent which was not a paper sheet . In this example, the shrinkage during drying is 0.
It was maintained at about 5 to 1%.

[0011] In this example, a case has been exemplified where heat-dried, molded adsorbent not paper sheets definitive to the present invention can be obtained by natural drying. In this example, since the inexpensive granular (powdered) activated carbon was mixed in an appropriate amount ratio, the cost could be remarkably reduced. As a matter of course, this mixing ratio can be set to an appropriate value. However,
When granules are used for the activated carbon, the particle size is 0.18 to 0.36 mm (bulk density; 0.1 g, as in this example).
/ Cc to 0.3 g / cc). This is because when the content is in this range, vacuum molding is possible, the water flow performance is not deteriorated, and a sufficient specific surface area (activated carbon adsorption area) can be maintained.

In the above embodiments, the activated carbon is a mixture of granular activated carbon and fibrous activated carbon. However, in the present invention, the case where granular (powdered) activated carbon or only fibrous activated carbon is used as the activated carbon is also described. Can be converted. It is also possible to use activated carbon in other forms such as flakes. Activated carbon should not be a paper sheet such as petroleum pitch.
Select the appropriate one according to the application of the molded adsorbent ,
You can use it. By the way, in the case of fibrous activated carbon, the fiber diameter is 2 to 30 μm, and the fiber length is 0.1 to 10 m.
It is preferable to use pores having m and a radius of about 8 to 20 Å and a specific surface area of about 1500 to 2500 m ² / g.

Although the fibrillated aramid fibers are of the meta type in the above embodiments, para type fibers may be used as long as they are fibrillated. In addition, regardless of the meta type or the para type, the aramid fiber is preferably sufficiently fibrillated in order to enhance the entanglement property, but in both the meta type and the para type, the fiber is in the fibrillated state. However, the particle diameter (width) is in the range of 1 to 200 μm, and the average length is 0.2 to
A material having a thickness of about 3 mm is preferable from the viewpoint of maintaining the strength of the molded product.

In addition, the fibrillated aramid fiber
The compounding ratio will be appropriately set according to the application of the molded adsorbent which is not a paper sheet, etc., but generally, with respect to the total weight of the molded adsorbent which is not a paper sheet excluding aramid fiber,
The amount is 0.5 to 15% by weight, preferably about 1 to 10% by weight. If it is less than 0.5 to 1% by weight, the adsorption capacity is high and the water resistance is small, but both the wet strength and the dry strength are lowered. On the other hand, if it exceeds 10 to 15% by weight, the strength is increased, but the adsorption capacity is lowered and the water resistance becomes too large. Incidentally, when used as an adsorbent for a water purifier for purifying and filtering water, about 5% by weight is suitable. However, in order to reduce shrinkage due to drying, the compounding ratio should be as small as possible. This ratio is used in the above example to remove the paper sheet excluding the aramid fiber.
If the amount is 10% by weight, the amount is about 0.7 to 2.0%, and if it is 3% by weight, the amount is about 0.1 to 0.6% with respect to the total weight of the molded adsorbent that is not a sheet. It was the contraction rate. Na
Depending on the application of the molded adsorbent that is not a paper sheet ,
Additives (chemicals) such as a water resistant agent and an aggregating agent, and further fibrous substances (materials) for enhancing water-passing performance can be mixed. In addition, in the present invention, in addition to the fibrillated aramid fiber, an appropriate binder may be included. For example, an appropriate amount of fibrillated acrylic fiber can be added.

In the present inventionMolded adsorbent that is not such a paper sheet
Is used for deodorizing, decolorizing and removing chlorine components of drinking water
Adsorbent (filter) for water purifier, adsorption for air purifier
Used to collect materials or solvents in chemical plants
It can be applied to various applications such as adsorbents.In addition,
Shaped adsorbentIs a cylinder with both ends open
Not a square tube with a polygonal cross section or a tube with one end closed
Shape (cup shape) or flat plate, etc.
Can be embodied as

[0016]

As apparent from the above description, the molded adsorbent not paper sheets definitive to the present invention <br/>, to those made by bonding by entanglement of aramid fibers fibrillated activated carbon It is possible to increase the strength of the molded product during wet or dry. Therefore, conventionally, such as prone extremely not carefully handled when loss of shape during demolding, handling has been a marked difficulty in (workability), not the paper sheet definitive to the present invention formed
Since the shaped adsorbent can remarkably reduce the occurrence of damage and deformation during handling, it is extremely effective in improving workability and productivity. Also, because it is a structure that is joined by the entanglement of aramid fibers, not by heat fusion,
Since it can be obtained by drying at room temperature or a relatively low temperature and the melting process (equipment) can be eliminated, it is expected that production efficiency will be improved and cost will be reduced in that respect as well, and the shrinkage during drying is small, so dimensional stability It is possible to obtain a molded product having a high quality. Further, since the binding strength is high and the usage amount (composition ratio) of the binding material can be reduced , it is expected that the water-passing performance and the adsorption capacity of the molded adsorbent that is not a paper sheet will be improved. Moreover, since aramid fiber has excellent heat resistance and heat and humidity resistance,
Playback by steaming is also okay, so
The molded product according to the present invention is extremely easy to extend its life. Further, due to the solvent resistance and chemical resistance of the aramid fiber, the molded product according to the present invention is also suitable for solvent adsorption (recovery).

Continuation of front page (51) Int.Cl. ⁷ Identification code FI C02F 1/28 C02F 1/28 G D01F 6/60 311 D01F 6/60 311Z D21H 13/26 D21H 13/26 21/14 21/14

Claims (5)

(57) [Claims] 1. A paper formed by molding activated carbon as a main component.
Non-sheet shaped adsorbent, fibrillated
Use aramid fiber as a binder to bond the activated carbon.
In a method for producing a shaped adsorbent which is not a paper sheet, an aqueous slurry containing the activated carbon and the binder is prepared,
A certain amount of solid content in this aqueous slurry is applied to the mold surface of the mold.
Laminate by suction method, then dehydrate and wet
To obtain a wet compact, and then dry the wet compact.
The entanglement of the binder to bind the activated carbon.
And a method for producing a molded adsorbent which is not a paper sheet. 2. Paper formed by using activated carbon as a main component.
Non-sheet shaped adsorbent, fibrillated
Use aramid fiber as a binder to bond the activated carbon.
In a method for producing a shaped adsorbent which is not a paper sheet, an aqueous slurry containing the activated carbon and the binder is prepared,
Immerse the mold in this aqueous slurry to collect solids on the mold surface.
A predetermined amount was laminated by the suction method, and the solid content was laminated on the mold surface.
The mold is taken out of the aqueous slurry and dehydrated,
Demolded into a wet compact, and then the wet compact
The molded body is dried and the activated carbon is formed by entanglement of the binder.
Forming adsorption not paper sheet characterized by binding
Body manufacturing method. 3. Before forming a molded adsorbent that is not the paper sheet
The binder is not the paper sheet excluding the binder.
Characterized by 1 to 10% by weight based on the total weight of the body
A molded adsorbent which is not the paper sheet according to claim 1 or 2.
Manufacturing method. 4. A water purifier is a molded adsorbent that is not the paper sheet.
The adsorbent according to claim 1, 2 or 3,
A method for producing a shaped adsorbent other than the described paper sheet. 5. Before forming a molded adsorbent that is not the paper sheet
The activated carbon contains granular activated carbon.
Characterized by a particle size of 0.18 to 0.36 mm
The paper sheet according to claim 1, 2, 3 or 4
Manufacturing method of molded adsorbent .