JPS60204610A - Manufacture of formed article of activated carbon - Google Patents

Abstract

PURPOSE:To produce formed activated carbon containing powdery activated carbon dispersed in a carbon skeleton having air-permeable pores, by using an organic binder and a powdery activated carbon coated with a depolymerizable organic material as raw materials, kneading and forming the materials, and carbonizing the formed mixture. CONSTITUTION:Powdery activated carbon is coated with a depolymerizable organic material such as polyethylene, polypropylene, polybutadiene, etc. The amount of the organic material is 5-100pts.wt. per 100pts. of the activated carbon. The powdery activated carbon and an organic binder forming a carbon skeleton are used as main materials, and are kneaded and formed. The objective formed activated carbon containing powdery activated crbon dispersed in a carbon skeleton having air-permeable pores can be produced by carbonizing the formed mixture. The formed activated carbon has the function of activated carbon as well as the strength of the formed article.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an activated carbon molded product that has both the function of activated carbon and the strength of a molded product.

Molded activated carbon has the great advantage of being extremely easy to handle compared to granular or powdered materials, but it is difficult to obtain activated carbon that satisfies both function and strength. be. In other words, although a molded product of activated carbon itself may be functionally superior, it tends to be extremely poor in strength, and a molded product containing powdered activated carbon dispersed in some type of skeleton with continuous pores is Even if the strength is excellent (to i), the functionality tends to be significantly inferior.

The present invention has been made in view of the above-mentioned problems, and it is possible to incorporate powdered activated carbon into a carbon skeleton that can contain a sufficient amount of dispersed activated carbon compared to a skeleton obtained using an inorganic binder such as clay. The object of the present invention is to provide a method for making an activated carbon molded product excellent both in two functions and in strength by dispersing it in such a way that it can exhibit its functions. In the present invention, the material of the powdered activated carbon and the organic binder which is the material of the carbon skeleton are at least mainly H+ and are kneaded.

A method for producing an activated carbon molded product in which powdery activated carbon is dispersed in a carbon skeleton having continuous pores by performing a carbonization treatment after molding, wherein the material for the powdery activated carbon is Il/7@. The gist of this paper is a method for producing activated carbon molded products, which is characterized by using a molded carbon product that has been coated in advance with an organic material.

What is the origin of the powdered activated carbon used in this Saaki?

Powdered activated carbon itself can be mentioned first, but it can also include non-powdered materials and precursors of activated carbon.

This is because powdering and activated carbonization may occur during the manufacturing process, such as cross-circuiting using a roll machine, carbonization treatment, and activation treatment. 4) Any activated carbon molded product that is 6) contained in the carbon channel may be used. Therefore, fibrous materials can also be used. However, although it is sufficient if the diameter is too large, it may cause a decrease in the strength of the molded product.

Therefore, if you do not expect powderization during the manufacturing process, 1
It is desirable to prepare one having a diameter of 00 μm or more, more preferably 50 μm or less.

9 Examples of depolymerizable organic substances that coat the series of powdered activated carbon materials include polyethylene.

Examples include polypropylene, polybutanene, polyisoftylene polystyrene, nylon, polymethmethylstyrene, polymethyl methacrylate, polyethyl methacrylate, and poly-α-toiterostyrene. Natural rubber has an extremely high degree of compatibility.

+1'l' Powdered activated carbon material made from polymerizable organic matter Methods include emulsion or suspension methods, powder bed methods, and other known methods for producing microcapsules, but What seems to be the simplest method is to knead while using a plasticizer, solvent, etc. as necessary. It also has the advantage that the proportion of the amount used can be easily improved. The amount of depolymerizable organic matter covered varies depending on the S type of the powdered activated carbon material, etc.
If converted into activated carbon, the ratio by weight is 5 to 100% per 100% activated carbon. More preferably, it is in the range of 10 to 40.

” = The product obtained as described above is mixed with an organic binder which is a +J layer of carbon skeleton, using a 6-wood roll, a Henschel mixer,
The mixture is kneaded using a pressurized kneader or the like. It is also possible to unify the process by adding organic bonding agents to areas where the depolymerizable organic substance and the powdered activated carbon material continue to mix.

Here, when mixing with the organic binder phase, it is of course possible to use other substances such as plasticizers and solvents as necessary, and depending on the application, they may also be used to improve other functions. Substance 2, such as graphite for improving conductivity, may also be added in this step.

In addition, the organic ISi compound can be selected from a variety of natural and synthetic resins, rubber, thermosetting initial condensates, pitch, tar, asphalt I, etc., for example.

Styrene resin, acrylic resin, urea resin, melamine resin, polyester resin, furan resin.

Uses that may dissolve phenolic resin, polyvinyl alcohol, polyacryloamide, butyl rubber, chlorinated polyvinyl chloride, chlorinated polyethylene, and polyvinyl chloride should be avoided.

This is because, even though the material of the activated carbon molded article has been covered with depolymerized substances at great length, this may be removed. therefore.

Instead of using a winter/summer layer for the coating, or using only one depolymerized type or organic binder, one or both of them may be used in combination, or a plasticizer may be used. It is advisable to pay special attention to the selection of solvents, especially when it comes to solvents and temperatures.

The mixed wire obtained by the above-mentioned I-filtering is molded by an appropriate method such as injection or extrusion, and is placed in an inert scum atmosphere or a reducing atmosphere at least at island temperature for carbonization.

Heat treatment in a non-oxidizing atmosphere such as a vacuum atmosphere (taking into consideration sufficient carbonization and strength reduction, the maximum temperature TK is so
(preferably at about 7 to 900°C) and, if necessary, an activation treatment to obtain activated carbonic acid form 1.

This will be explained in detail based on examples.

<Example 1> Kuraraycol PK (
Add 50 parts by weight of powdered activated carbon manufactured by Kuraray Chemical ■, 40~+00% menon, and thoroughly knead it in an open kneader. The mixture was kneaded with 6 rolls and a solution of 3OOffl in an amount of 1 x 1 t, and the water was volatilized to some extent, and the kneaded material with good formability was extruded to form a rod-shaped molded product with a diameter of about 1 mm. Obtained.

After thoroughly drying this at room temperature, it is heated to 160°C or more in a nitrogen atmosphere to prevent unnecessary deformation such as swelling and cracking.
The temperature was gradually increased so that the rate of temperature increase between 00°C and 00°C was 5°C/hour or less, and the temperature was further increased to 850°C over 5 hours and maintained for 1 hour.

<Example 2> In Example 1, everything was the same as in Example 1 except that the amount of Acryn Wrap 5Y-103 used was changed from 10 overlapping parts to 20 overlapping parts.

< Real Rikiya I row 6 > Acrysolap 5Y-401 (polymethyl methacrylate manufactured by Mitsubishi Rayon ■) 2olji part was added to Acryester M (
Methyl methacrylate monomer manufactured by Mitsubishi Rayon■) 30
Dilute with parts by weight, charcoal powder (200 mesotuyu F or more) 10
Add 0 weight Iik part and knead thoroughly with a kneader. Next, knead with 6 rolls together with furan + 1 h 40 m part and phenolic resin 1 o heavy part, and extrude to form a diameter of about 1 m.
After drying and curing at 70°C for 80
Heat treatment was performed up to 0°C.

<Comparative Example 1> Example 1 was repeated except that Kuraraycol PK was directly kneaded with a solution of Arabicum and methyl cellulose using a 6-wood roll without mixing with the solution of Acrysolap 5Y-103. I did the same thing.

Comparative Example 2> In Example B, all procedures were carried out in the same manner as in Example 5, except that the charcoal powder was directly kneaded with the furan resin and phenol resin using a 6-wooden roll. did.

Table 1 shows the test results for 11) on each side above.

Table-1 (Note 1) Strength measurement is JIS S 601? According to.

(Note 2) The specific surface area M1 constant was determined by the BET method.

(Note 6) Adsorption ability is determined by methylene flue decolorization ability.
According to JIS K 1470. l <Example 4> Ninotan Y (powdered activated carbon, manufactured by Hitachi Carbon Industries, Ltd., 150 mesh (below) 50 parts by weight were added and thoroughly kneaded with a kneader.
4H parts, ) 25 parts by weight of octyl phthalate, 2 parts by weight of stearate, and 50 parts by weight of graphite were kneaded in a filter roll, extruded to obtain a rod-shaped product with a diameter of about 15 mm, and this was made with holes of about 8 holes. to form a hollow body with a bottom, and from room temperature to 3
After raising the temperature to 00°C over 2 hours, heat treatment was performed to 850°C. After cooling and taking out, the surface of 9 was water-repellent treated with paraffin to prepare an electrode for an air battery.

<Comparative Example 3> Everything was the same as in Example 4 except that Ninotan Y was directly kneaded with polyvinyl chloride etc. without kneading with the solution of Acrycon AC.

Example 4. The one obtained in Comparative Example 3 was a 999% sub-ship cathode,
A wet air cell was constructed using a 30% aqueous sodium hydroxide solution (electrolyte), and the characteristics were determined, and the results are shown in Table 2.

Table-2 (Note 4) "Initial voltage" is the voltage value 5 minutes after the start of discharge.

(Note 5) ",o,'IV drop" is 0.0% from the initial voltage value.
Discharge time until it drops by 1V.

(Note 6) "Effective discharge" is the discharge time until the voltage reaches 075■.

As is clear from the above results, the activated carbon molded product obtained by the present invention has excellent activated carbon function and molded product strength, and can be effectively used for various purposes.

Patent applicant: Pentel Co., Ltd. Procedural amendment April 2, 1985 1, Indication of the case 1982 Patent Application No. 62902 2, Name of the invention Method for manufacturing activated carbon molded product 3, Person making the amendment Address: 103 Location: 7#i2, Kokinumachi, Nihonbashi, Chuo-ku, Tokyo
Insert a 25Ω resistor.

Claims (1)

[Claims] Activated carbon whose main materials are at least a powdered activated carbon material and an organic binder which is a carbon skeleton material, and which is cross-wired, formed, and then subjected to carbonization treatment so that the powdered activated carbon is dispersed and contained in the carbon skeleton having continuous pores. A method of manufacturing a molded article, the method comprising:
A method for manufacturing an activated carbon molded article, characterized in that the powdered activated carbon is made of a material coated in advance with a depolymerizable 41 type material.