CN114314585A - A kind of tablet-like activated carbon and preparation method thereof - Google Patents

Abstract

A tablet-shaped activated carbon and a preparation method thereof, which relate to the field of activated carbon material processing; comprising the following steps: S1, stirring and mixing activated carbon, a binder and water to obtain a mixture; S2, compressing the mixture to form an activated carbon embryo body; S3, drying the activated carbon embryo body to obtain an activated carbon core body; S4, using a coating liquid to coat the activated carbon core body to obtain the tablet-shaped activated carbon. The preparation method of the tablet-shaped activated carbon of the present invention can reduce dust and enhance the hardness by adopting a coating process, and the activated carbon can be made into a tablet shape, which can avoid the use of outer packaging and reduce the space occupied by the outer packaging, and is widely used in Industrial manufacturing, electronics, pharmaceuticals, food and other fields. The tablet-shaped activated carbon of the present invention has high hardness and less dust, eliminates the need for outer packaging, and reduces the occupied working space.

Description

A kind of tablet-like activated carbon and preparation method thereof

technical field

The invention belongs to the field of activated carbon material processing, in particular to a tablet-shaped activated carbon and a preparation method thereof.

Background technique

Activated carbon is a carbon material with developed microporous structure, large specific surface area, abundant surface chemical groups, and strong specific adsorption capacity.

Due to the large amount of dust in activated carbon, when using activated carbon, it is generally necessary to use different utensils for packaging to prevent the dust from affecting other products. The packaging materials are generally breathable paper, rubber bottles, large devices, etc. These activated carbon products are not only large in size If it is larger, its packaging will also take up a certain amount of space.

The patent number is CN201520221401.X, and the name is a patent document of a multi-layer structure of solid-state adsorption activated carbon particles and activated carbon cotton. The activated carbon cotton layer is used to enhance the filtering effect, but a cloth bag layer needs to be installed to avoid the loss of activated carbon dust.

The patent number is CN88105809.2, and the patent document is named toilet deodorant (odor absorber), which combines activated carbon, silicon dioxide, calcium oxide, aluminum oxide, magnesium oxide and other substances to prevent different odors and various harmful substances. The odor gas is adsorbed to achieve the purpose of deodorizing, absorbing and purifying the environment; it also needs to be packaged in a more breathable cloth bag and plastic box.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, one of the objects of the present invention is to provide a preparation method of tablet-shaped activated carbon, the tablet-shaped activated carbon has high hardness, less dust, eliminates the need for external packaging, and reduces the space occupied.

The second purpose of the present invention is to provide a tablet-like activated carbon.

One of the objects of the present invention adopts the following technical scheme to realize:

A preparation method of tablet-shaped activated carbon is provided, comprising the following steps:

S1, stirring and mixing activated carbon, binder and water to obtain a mixture;

S2, the mixture is pressed and molded to form an activated carbon embryo;

S3, drying the activated carbon embryo to obtain an activated carbon core;

S4, using a coating solution to coat the activated carbon core to obtain the tablet-like activated carbon.

Further, in step S1, in parts by mass, the mixture includes 35-55 parts of activated carbon, 25-45 parts of binder, and 10-25 parts of water. The particle size of the activated carbon is preferably 60-300 mesh.

Further, the binder is a cellulose derivative with a viscosity of 2000-5000 mPa.s.

Further, in step S2, the pressure of pressing is 500-1000 MPa.

Further, in step S3, the drying temperature is 50-120° C., and the drying time is 1-3 h.

Further, in step S4, the coating treatment method is a tumbling coating method.

Further, the coating treatment comprises the following steps:

1) adding the macromolecular polymer to the ethanol solution to dissolve, to prepare a coating solution, for subsequent use;

2) Preheat the coating pot, then put in the activated carbon core and heat it, then add the coating liquid to coat the activated carbon core, and cool it.

Further, the high molecular polymer is at least one of hypromellose, polyacrylic acid 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° C., and the coating treatment time is 15-25 min.

The second purpose of the present invention adopts the following technical scheme to realize:

A tablet-shaped activated carbon, prepared by the preparation method of the tablet-shaped activated carbon, comprising an activated carbon core layer and a coating layer coated on the surface of the activated carbon core layer; in parts by mass, the activated carbon core layer comprises, 35-55 parts of activated carbon and 25-45 parts of binder; the dosage of the coating layer is 2-4% of the activated carbon core layer.

Compared with the prior art, the beneficial effects of the present invention are:

In the preparation method of the tablet-shaped activated carbon of the present invention, the coating process can reduce dust, enhance the hardness, and make the activated carbon into a tablet shape, which can eliminate the use of outer packaging and reduce the space occupied by the outer packaging. At the same time, the drying treatment before the coating treatment can improve the hardness, and dry the moisture in the micropores of the activated carbon to free up space to adsorb other substances and ensure its adsorption activity. In addition, the coated tablet-shaped activated carbon has a small volume, which can be built into the parts, saving space and separated from other products; and can be compressed into different shapes of activated carbon, such as disc, long, Cylinders and cubes, etc., are widely used in industrial manufacturing, electronics, medicine, food and other fields.

The tablet-shaped activated carbon of the present invention has high hardness and little dust, eliminates the need for outer packaging, and reduces the occupied working space.

Description of drawings

Fig. 1 is a process flow diagram of a preparation method of tablet-shaped activated carbon of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form new embodiments. .

Example 1

A tablet-shaped activated carbon, prepared by the preparation method of the tablet-shaped activated carbon, comprising 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 includes a high molecular polymer.

The preparation method of described tablet-like activated carbon, with reference to Fig. 1, comprises the following steps:

S1, stirring and mixing 35 parts of activated carbon, 45 parts of binder and 25 parts of distilled water to obtain a mixture; wherein, the binder is a cellulose derivative, and its viscosity is 2000 mPa.s; the particle size of the activated carbon is 60- 100 mesh;

S2, pressing and forming the mixture to form an activated carbon embryo; the pressure of pressing and forming is 2000MPa;

S3, drying the activated carbon embryo to obtain an activated carbon core; the drying temperature is 50°C, and the drying time is 3h;

S4, the activated carbon core is coated with a coating liquid 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) adding the macromolecular polymer into 75% ethanol to dissolve, preparing a coating solution for subsequent use; wherein the macromolecular polymer is polyacrylic resin IV; the mass ratio of the macromolecular polymer to the 75% ethanol solution is 1:10 ;

2) Preheat the coating pot, then put the activated carbon core body and heat it, then add the coating liquid to coat the activated carbon core body, cool it, and get it; wherein, the temperature of the coating pot is 55°C ± 5°C, The coating treatment time was 20 min.

Example 2

A tablet-shaped activated carbon, prepared by the preparation method of the tablet-shaped activated carbon, comprising 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 includes a high molecular polymer.

The preparation method of the tablet-like activated carbon comprises the following steps:

S1, stirring and mixing 55 parts of activated carbon, 25 parts of binder and 10 parts of distilled water to obtain a mixture; wherein, the binder is a cellulose derivative, and its viscosity is 5000 mPa.s; the particle size of the activated carbon is 200- 300 mesh;

S2, pressing and forming the mixture to form an activated carbon embryo; the pressure of pressing and forming is 500MPa;

S3, drying the activated carbon embryo to obtain an activated carbon core; the drying temperature is 120° C., and the drying time is 1 h;

S4, the activated carbon core is coated with a coating liquid 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) adding the macromolecular polymer to 75% ethanol to dissolve, preparing a coating solution for subsequent use; wherein the macromolecular polymer is polyvinylpyrrolidone; the mass ratio of the macromolecular polymer to the 75% ethanol solution is 1:10;

2) Preheat the coating pot, then put the activated carbon core body and heat it, then add the coating liquid to coat the activated carbon core body, cool it, and get it; wherein, the temperature of the coating pot is 55°C ± 5°C, The coating treatment time was 20 min.

Example 3

A tablet-shaped activated carbon, prepared by the preparation method of the tablet-shaped activated carbon, comprising 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 includes a high molecular polymer.

The preparation method of the tablet-like activated carbon comprises the following steps:

S1, stirring and mixing 45 parts of activated carbon, 35 parts of binder and 20 parts of distilled water to obtain a mixture; wherein, the binder is a cellulose derivative, and its viscosity is 3500 mPa.s; the particle size of the activated carbon is 100- 200 mesh;

S2, pressing and forming the mixture to form an activated carbon embryo; the pressure of pressing and forming is 800MPa;

S3, drying the activated carbon embryo to obtain an activated carbon core; the drying temperature is 90°C, and the drying time is 2h;

S4, the activated carbon core is coated with a coating liquid 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) adding high molecular polymer into 75% ethanol to dissolve, preparing coating solution, for subsequent use; wherein said high molecular polymer is hypromellose; the mass ratio of high molecular polymer and 75% ethanol solution is 1: 10;

2) Preheat the coating pot, then put the activated carbon core body and heat it, then add the coating liquid to coat the activated carbon core body, cool it, and get it; wherein, the temperature of the coating pot is 55°C ± 5°C, The coating treatment time was 20 min.

Comparative Example 1

The other parts of Comparative Example 1 are the same as those of Example 3, except that the preparation method of the activated carbon of Comparative Example 1 does not include the coating treatment of step S4.

Performance Testing

Get the tablet-like activated carbon of embodiment 1-3 and comparative example 1, adopt the following method to carry out hardness test:

1) Drop freely from 2 meters and observe the change of its surface topography;

2) Take 30 tablet-shaped activated carbons and put them in a 250mL glass bottle, shake them for 2 minutes, and observe the change of their surface morphology.

3) Use the Pharmacopoeia 2015 edition, the fourth part, the general rule, the 0923 tablet friability test method to test, take 10 tablet-shaped activated carbons and weigh them accurately, place them in the transparent wear-resistant plastic cylinder with polished inner wall, 25 rpm/ Rotate for 2 min under min, weigh accurately, and calculate the weight loss.

2. The test results are shown in Table 1.

Table 1 Strength Test

Referring to Table 1, a kind of tablet-shaped activated carbon of Examples 1-3 has higher hardness, and can be free from outer packaging, reducing the space occupied by outer packaging, and the tablet-shaped activated carbon of Comparative Example 1 has not undergone coating treatment, Its hardness is low.

The above-mentioned embodiments are only preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of the present invention. Scope of protection claimed.

Claims (10)

1. a preparation method of tablet-like activated carbon, is characterized in that, comprises the following steps: S1, stirring and mixing activated carbon, binder and water to obtain a mixture; S2, the mixture is pressed and molded to form an activated carbon embryo; S3, drying the activated carbon embryo to obtain an activated carbon core; S4, using a coating solution to coat the activated carbon core to obtain the tablet-like activated carbon. 2. the preparation method of a kind of tablet-like activated carbon as claimed in claim 1 is characterized in that: in step S1, according to mass parts, described mixture comprises activated carbon 35-55 parts, binder 25-45 parts , 10-25 parts of water. 3. The preparation method of a tablet-like activated carbon according to claim 1 or 2, wherein the binder is a cellulose derivative, and its viscosity is 2000-5000 mPa.s. 4. The preparation method of tablet-like activated carbon according to claim 1, characterized in that: in step S2, the pressure of compression molding is 500-1000MPa. 5. The preparation method of tablet-like activated carbon according to claim 1, characterized in that: in step S3, the drying temperature is 50-120° C., and the drying time is 1-3 h. 6. The preparation method of a tablet-like activated carbon according to claim 1, characterized in that: in step S4, the coating treatment method is a tumbling coating method. 7. the preparation method of a kind of tablet-like activated carbon as claimed in claim 6, is characterized in that: The coating treatment includes the following steps: 1) adding the macromolecular polymer to the ethanol solution to dissolve, to prepare a coating solution, for subsequent use; 2) Preheat the coating pot, then put in the activated carbon core and heat it, then add the coating liquid to coat the activated carbon core, and cool it. 8. the preparation method of a kind of tablet-like activated carbon as claimed in claim 7, is characterized in that: described macromolecular polymer is at least one in hypromellose, polyacrylic acid resin IV and polyvinylpyrrolidone; The mass ratio of high molecular polymer and ethanol solution is 1:10. 9 . The preparation method of tablet-like activated carbon according to claim 7 , wherein the temperature of the coating pan is 50-60° C., and the coating treatment time is 15-25 min. 10 . 10. A tablet-shaped activated carbon, made by the preparation method of the tablet-shaped activated carbon according to any one of claims 1-9, characterized in that it comprises an activated carbon core layer and a bag coated on the surface of the activated carbon core layer. A coating layer; in parts by mass, the activated carbon core layer includes 35-55 parts of activated carbon and 25-45 parts of a binder; the amount of the coating layer is 2-4% of the activated carbon core layer.

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