CN114314585A - Tablet-shaped activated carbon and preparation method thereof - Google Patents
Tablet-shaped activated carbon and preparation method thereof Download PDFInfo
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- CN114314585A CN114314585A CN202111357721.4A CN202111357721A CN114314585A CN 114314585 A CN114314585 A CN 114314585A CN 202111357721 A CN202111357721 A CN 202111357721A CN 114314585 A CN114314585 A CN 114314585A
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Abstract
A tablet active carbon and a preparation method thereof relate to the field of active carbon material processing; the method comprises the following steps: s1, stirring and mixing the activated carbon, the adhesive and the water to obtain a mixture; s2, pressing and forming the mixture to form an activated carbon blank; s3, drying the activated carbon blank to obtain an activated carbon core body; s4, coating the activated carbon core by using a coating solution to obtain the tablet-shaped activated carbon. The preparation method of the tablet-shaped activated carbon can reduce dust and enhance hardness by adopting a coating process, and the activated carbon is prepared into a tablet shape, so that an external package is not needed, the space occupied by the external package is reduced, and the tablet-shaped activated carbon can be widely applied to the fields of industrial manufacturing, electronic industry, medicines, foods and the like. The tablet active carbon has high hardness and less dust, saves external packaging and reduces occupied working space.
Description
Technical Field
The invention belongs to the field of active carbon material processing, and particularly relates to tablet-shaped active carbon and a preparation method thereof.
Background
The activated carbon is a carbon material with a developed microporous structure, a large specific surface area, abundant surface chemical groups and strong specific adsorption capacity.
Because the dust is more in the activated carbon, when generally using activated carbon, need adopt different household utensils to pack in order to prevent that the dust from influencing other products, the packing material generally is ventilative paper, sizing material bottle, large-scale device etc. this type of activated carbon product not only volume is great, and its packing material also can occupy certain space.
Patent No. cn201520221401.x, entitled a patent document of solid-state adsorption activated carbon particles and activated carbon cotton multilayer structure, adopts activated carbon cotton layer to enhance the filtering effect, but needs to install a cloth bag layer to avoid the loss of activated carbon dust.
Patent No. CN88105809.2, entitled toilet deodorizer (odor absorbent), combines substances such as activated carbon, silicon dioxide, calcium oxide, aluminum oxide, magnesium oxide, etc., and adsorbs various odorous gases and different malodorous gases, thereby achieving the purposes of deodorizing, absorbing odor and purifying the environment; it also requires the use of a relatively breathable bag plastic box for packaging.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a preparation method of tablet-shaped activated carbon, which has high hardness and less dust, saves external packaging and reduces occupied space.
Another object of the present invention is to provide a tablet-shaped activated carbon.
One of the purposes of the invention is realized by adopting the following technical scheme:
provided is a method for preparing a tablet-shaped activated carbon, comprising the steps of:
s1, stirring and mixing the activated carbon, the adhesive and the water to obtain a mixture;
s2, pressing and forming the mixture to form an activated carbon blank;
s3, drying the activated carbon blank to obtain an activated carbon core body;
s4, coating the activated carbon core by using a coating solution to obtain the tablet-shaped activated carbon.
Further, in step S1, the mixed material includes, by mass, 35 to 55 parts of activated carbon, 25 to 45 parts of a binder, and 10 to 25 parts of water. The particle size of the activated carbon is preferably 60 to 300 mesh.
Further, the binder is a cellulose derivative having a viscosity of 2000-5000 mPa.s.
Further, in step S2, the pressure of the press molding is 500-1000 MPa.
Further, in step S3, the drying temperature is 50-120 ℃, and the drying time is 1-3 h.
Further, in step S4, the coating process is a tumbling coating process.
Further, the coating treatment comprises the following steps:
1) adding the high molecular polymer into an ethanol solution for dissolving to prepare a coating solution for later use;
2) preheating a coating pan, adding the active carbon core body, heating, adding the coating liquid to coat the active carbon core body, and cooling to obtain the coating liquid.
Further, the high molecular polymer is at least one of hydroxypropyl methylcellulose, polyacrylic resin IV and polyvinylpyrrolidone; the mass ratio of the high molecular polymer to the ethanol solution is 1: 10.
Further, the temperature of the coating pan is 50-60 ℃, and the coating treatment time is 15-25 min.
The second purpose of the invention is realized by adopting the following technical scheme:
the tablet-shaped activated carbon is prepared by the preparation method and comprises an activated carbon core layer and a coating layer coated on the surface of the activated carbon core layer; the active carbon core layer comprises, by mass, 35-55 parts of active carbon and 25-45 parts of adhesive; the dosage of the coating layer is 2-4% of the active carbon core layer.
Compared with the prior art, the invention has the beneficial effects that:
the preparation method of the tablet-shaped activated carbon can reduce dust and enhance hardness by adopting a coating process, and the activated carbon is prepared into the tablet shape, so that an external package is not required, and the space occupied by the external package is reduced. Meanwhile, the hardness can be improved by drying before coating, and the moisture in the micropores of the activated carbon is dried to make room for adsorbing other substances and ensure the adsorption activity of the substances. In addition, the coated tablet-shaped active carbon has smaller volume, can be embedded in parts, saves space and is separated from other products; and can be pressed into active carbon with different shapes, such as round sheet, strip, cylinder, cube, and the like, and is widely applied to the fields of industrial manufacture, electronic industry, medicines, foods, and the like.
The tablet active carbon has high hardness and less dust, saves external packaging and reduces occupied working space.
Drawings
FIG. 1 is a process flow diagram of a method for preparing a tablet-shaped activated carbon according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example 1
The tablet-shaped activated carbon is prepared by the preparation method and comprises an activated carbon core layer and a coating layer coated on the surface of the activated carbon core layer; the activated carbon core layer comprises activated carbon and a binder; the coating layer comprises a high molecular polymer.
The preparation method of the tablet-shaped activated carbon, referring to fig. 1, comprises the following steps:
s1, stirring and mixing 35 parts of activated carbon, 45 parts of adhesive and 25 parts of distilled water to obtain a mixture; wherein the binder is a cellulose derivative having a viscosity of 2000 mpa.s; the particle size of the active carbon is 60-100 meshes;
s2, pressing and forming the mixture to form an activated carbon blank; the pressure intensity of the compression molding is 2000 MPa;
s3, drying the activated carbon blank to obtain an activated carbon core body; the drying temperature is 50 ℃, and the drying time is 3 h;
s4, coating the activated carbon core by using a coating solution to obtain the tablet-shaped activated carbon; the coating treatment method is a tumbling coating method.
Further, the coating treatment comprises the following steps:
1) dissolving the high molecular polymer in 75% ethanol to prepare a coating solution for later use; wherein the high molecular polymer is polyacrylic resin IV; the mass ratio of the high molecular polymer to the 75% ethanol solution is 1: 10;
2) preheating a coating pot, then adding an active carbon core body and heating, then adding the coating liquid to coat the active carbon core body, and cooling to obtain the coating liquid; wherein the temperature of the coating pan is 55 +/-5 ℃, and the coating treatment time is 20 min.
Example 2
The tablet-shaped activated carbon is prepared by the preparation method and comprises an activated carbon core layer and a coating layer coated on the surface of the activated carbon core layer; the activated carbon core layer comprises activated carbon and a binder; the coating layer comprises a high molecular polymer.
The preparation method of the tablet-shaped activated carbon comprises the following steps:
s1, stirring and mixing 55 parts of activated carbon, 25 parts of adhesive and 10 parts of distilled water to obtain a mixture; wherein the binder is a cellulose derivative having a viscosity of 5000 mpa.s; the particle size of the active carbon is 200-300 meshes;
s2, pressing and forming the mixture to form an activated carbon blank; the pressure of the compression molding is 500 MPa;
s3, drying the activated carbon blank to obtain an activated carbon core body; the drying temperature is 120 ℃, and the drying time is 1 h;
s4, coating the activated carbon core by using a coating solution to obtain the tablet-shaped activated carbon; the coating treatment method is a tumbling coating method.
Further, the coating treatment comprises the following steps:
1) dissolving the high molecular polymer in 75% ethanol to prepare a coating solution for later use; wherein the high molecular polymer is polyvinylpyrrolidone; the mass ratio of the high molecular polymer to the 75% ethanol solution is 1: 10;
2) preheating a coating pot, then adding an active carbon core body and heating, then adding the coating liquid to coat the active carbon core body, and cooling to obtain the coating liquid; wherein the temperature of the coating pan is 55 +/-5 ℃, and the coating treatment time is 20 min.
Example 3
The tablet-shaped activated carbon is prepared by the preparation method and comprises an activated carbon core layer and a coating layer coated on the surface of the activated carbon core layer; the activated carbon core layer comprises activated carbon and a binder; the coating layer comprises a high molecular polymer.
The preparation method of the tablet-shaped activated carbon comprises the following steps:
s1, stirring and mixing 45 parts of activated carbon, 35 parts of adhesive and 20 parts of distilled water to obtain a mixture; wherein the adhesive is a cellulose derivative with a viscosity of 3500 mPa.s; the particle size of the active carbon is 100-200 meshes;
s2, pressing and forming the mixture to form an activated carbon blank; the pressure intensity of the compression molding is 800 MPa;
s3, drying the activated carbon blank to obtain an activated carbon core body; the drying temperature is 90 ℃, and the drying time is 2 h;
s4, coating the activated carbon core by using a coating solution to obtain the tablet-shaped activated carbon; the coating treatment method is a tumbling coating method.
Further, the coating treatment comprises the following steps:
1) dissolving the high molecular polymer in 75% ethanol to prepare a coating solution for later use; wherein the high molecular polymer is hydroxypropyl methylcellulose; the mass ratio of the high molecular polymer to the 75% ethanol solution is 1: 10;
2) preheating a coating pot, then adding an active carbon core body and heating, then adding the coating liquid to coat the active carbon core body, and cooling to obtain the coating liquid; wherein the temperature of the coating pan is 55 +/-5 ℃, and the coating treatment time is 20 min.
Comparative example 1
The other parts of comparative example 1 are the same as example 3 except that: the process for preparing activated carbon of comparative example 1 does not include the coating process of step S4.
Performance testing
The tablet-shaped activated carbon of examples 1 to 3 and comparative example 1 was used for the hardness test by the following method:
1) freely falling from a 2m place, and observing the surface appearance change of the glass;
2) 30 tablets of activated carbon are placed in a 250mL glass bottle, shaken for 2min, and the change of the surface morphology is observed.
3) Testing by adopting a friability detection method of 0923 tablets in pharmacopoeia 2015 edition fourth part, general rules, taking 10 tablets of activated carbon, precisely weighing, placing in a transparent wear-resistant plastic cylinder with a polished inner wall, rotating for 2min at 25 rpm, precisely weighing, and calculating the weight loss.
2. The test results are shown in table 1.
TABLE 1 Strength test
Referring to table 1, the activated carbon in the form of tablets of examples 1 to 3 has a high hardness, and thus, an outer package is not required, and the space occupied by the outer package is reduced, while the activated carbon in the form of tablets of comparative example 1 has a low hardness without being coated.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A method for producing a tablet-like activated carbon, characterized by comprising the steps of:
s1, stirring and mixing the activated carbon, the adhesive and the water to obtain a mixture;
s2, pressing and forming the mixture to form an activated carbon blank;
s3, drying the activated carbon blank to obtain an activated carbon core body;
s4, coating the activated carbon core by using a coating solution to obtain the tablet-shaped activated carbon.
2. A process for preparing a tablet-like activated carbon as claimed in claim 1, characterized by: in step S1, the mixture comprises, by mass, 35-55 parts of activated carbon, 25-45 parts of a binder and 10-25 parts of water.
3. A process for producing a tablet-like activated carbon as claimed in claim 1 or 2, characterized in that: the binder is a cellulose derivative having a viscosity of 2000-5000 mPa.s.
4. A process for preparing a tablet-like activated carbon as claimed in claim 1, characterized by: in step S2, the pressure for press molding is 500-1000 MPa.
5. A process for preparing a tablet-like activated carbon as claimed in claim 1, characterized by: in step S3, the drying temperature is 50-120 ℃, and the drying time is 1-3 h.
6. A process for preparing a tablet-like activated carbon as claimed in claim 1, characterized by: in step S4, the coating process is rolling coating.
7. A process for preparing a tablet-like activated carbon as claimed in claim 6, characterized by:
the coating treatment comprises the following steps:
1) adding the high molecular polymer into an ethanol solution for dissolving to prepare a coating solution for later use;
2) preheating a coating pot, then adding the active carbon core body and heating, then adding the coating liquid to coat the active carbon core body, and cooling to obtain the coating liquid.
8. A process for preparing a tablet-like activated carbon as claimed in claim 7, characterized in that: the high molecular polymer is at least one of hydroxypropyl methylcellulose, polyacrylic resin IV and polyvinylpyrrolidone; the mass ratio of the high molecular polymer to the ethanol solution is 1: 10.
9. A process for preparing a tablet-like activated carbon as claimed in claim 7, characterized in that: the temperature of the coating pan is 50-60 deg.C, and the coating treatment time is 15-25 min.
10. A tablet-shaped activated carbon produced by the process for producing a tablet-shaped activated carbon according to any one of claims 1 to 9, comprising an activated carbon core layer and a coating layer coated on the surface of the activated carbon core layer; the active carbon core layer comprises, by mass, 35-55 parts of active carbon and 25-45 parts of adhesive; the dosage of the coating layer is 2-4% of the active carbon core layer.
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| CN202111357721.4A CN114314585A (en) | 2021-11-16 | 2021-11-16 | Tablet-shaped activated carbon and preparation method thereof |
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| CN202111357721.4A CN114314585A (en) | 2021-11-16 | 2021-11-16 | Tablet-shaped activated carbon and preparation method thereof |
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| CN114314585A true CN114314585A (en) | 2022-04-12 |
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