KR20210149322A - Core-shell porous ceramic balls and method of fabricating porous - Google Patents

Abstract

Provided are a porous ceramic ball and a method for preparing the same. The method comprises: a step of spraying a first solvent on first clay powder, and granulating the same to prepare a core; a step of drying the core; and a step of providing second clay powder and a second solvent to the dried core and granulating the same to form a shell surrounding the core. The core preparing step comprises a step of providing the first clay powder and the first solvent to a disk-shaped former and vibrating the disk-shaped former, and the shell preparing step comprises a step of providing the second clay powder and the second solvent to the ball former, and the rotating the ball former. According to the present invention, an absorption rate of a function solution can be improved.

Description

Core-shell porous ceramic balls and method of fabricating porous

The present application relates to a porous ceramic ball having a core-shell structure and a method for manufacturing the same, and more particularly, to a porous ceramic ball having a core-shell structure having an improved carrier function and a method for manufacturing the same.

A porous material is a material containing a large number of pores inside, and the technological capability to provide pores of various sizes at home and abroad has been accumulated. The various fields of application of the porous body are derived from its unique pore structure, and representatively, it can be usefully used for a wide variety of purposes, such as electrode materials, catalyst carriers, heat insulators, drug carriers, adsorbents, and oil absorbers.

When a porous body is synthesized in the form of fine particles, high specific surface area and porosity can be given at the individual particle level, so it is judged that there is more room for the advantages of the porous material to be expressed compared to the porous body obtained in the form of a film or bulk. . Among various types of porous fine particles, powder materials having large pores of 50 nm or more can be efficiently synthesized through self-assembly and firing processes by using an emulsion or aerosol as a limited space. In addition, in the case of porous particles with large pores, they can be used as catalysts, sensors, photonic crystals, and supercapacitors, and it is judged that it is necessary to prepare a basis for mass synthesis through the development of a mass production process in the future.

Recently, a technology for synthesizing porous fine particles with a hierarchical pore structure having mesopores and macropores at the same time has been researched and developed. It is expected that it will be usefully utilized for the purpose of overcoming shortcomings such as an increase in mass transfer resistance.

For example, according to the Republic of Korea Patent Publication (10-2001-0066059, applicant: Korea Institute of Science and Technology), it is a technology for a porous ceramic carrier for immobilization of microorganisms and a method for manufacturing the same, among siliceous raw materials, alumina raw materials and clay raw materials. It relates to a porous ceramic carrier for microbial immobilization comprising a ceramic raw material composition comprising one or more selected raw materials and hydrous waste, and a method for manufacturing the same, wherein the porous ceramic carrier is a circular rod-shaped, tube-shaped or gear-shaped carrier, wherein microorganisms are Since it can easily attach and grow on the ceramic carrier, its efficiency can be greatly improved in organic wastewater treatment using microorganisms. In addition, a low-cost carrier can be manufactured by using an inexpensive ceramic raw material composition.

One technical problem to be solved by the present invention is to provide a porous ceramic ball having a core-shell structure and a method for manufacturing the same.

Another technical problem to be solved by the present invention is to provide a porous ceramic ball having a core-shell structure having high durability and a method for manufacturing the same.

Another technical problem to be solved by the present invention is to provide a porous ceramic ball having a core-shell structure that releases a constant functional solution for a long period of time and a method for manufacturing the same.

Another technical problem to be solved by the present invention is to provide a porous ceramic ball having a core-shell structure in which a manufacturing process is simplified and a manufacturing method thereof.

Another technical problem to be solved by the present invention is to provide a porous ceramic ball having a core-shell structure with reduced manufacturing cost and a method for manufacturing the same.

Another technical problem to be solved by the present invention is to provide a porous ceramic ball having a core-shell structure having a high water absorption and a method for manufacturing the same.

Another technical problem to be solved by the present invention is to provide a porous ceramic ball having a high quality core-shell structure and a method for manufacturing the same.

Another technical problem to be solved by the present invention is to provide a porous ceramic ball having a core-shell structure having high reliability and a method for manufacturing the same.

The technical problem to be solved by the present invention is not limited to the above.

In order to solve the above technical problem, the present invention provides a method of manufacturing a ceramic ball having a core-shell structure.

According to one embodiment, the method for manufacturing the ceramic ball having a core-shell structure includes the steps of spraying and granulating a first solvent to a first clay powder to prepare a core, drying the core, and the dried It may include the step of providing and granulating the second clay powder and the second solvent to the core to prepare a shell surrounding the core.

According to an embodiment, the manufacturing of the core includes providing the first clay powder and the first solvent to a disk-shaped molding machine, and giving vibration to the disk-shaped molding machine, and manufacturing the shell The step of providing the second clay powder and the second solvent to the ball forming machine may include rotating the ball forming machine.

According to an embodiment, the rotation speed of the ball forming machine in the step of manufacturing the shell may include that of 100 rpm or less.

According to an embodiment, the first clay powder and the second clay powder may include at least one of diatomaceous earth, sepirite, clay, and bentonite.

In order to solve the above technical problem, the present invention provides a method of manufacturing a ceramic ball for air purification.

According to one embodiment, the method of manufacturing the ceramic ball for air purification includes the steps of manufacturing the ceramic ball of the core-shell structure according to the above-described embodiment, and loading a functional solution in the pores of the ceramic ball of the core-shell structure. It may include the step of

According to an embodiment of the present invention, a core is manufactured by granulating a first solvent by spraying a first clay powder, and a shell surrounding the core by providing the second clay powder and the second solvent to the core and granulating it This can be manufactured to manufacture a ceramic ball having a core-shell structure. Accordingly, it is possible to provide a method for manufacturing a ceramic ball in which the loading and absorption rates of the functional solution are improved, and the manufacturing process and cost are saved.

Alternatively, the functional solution may not be supported on the ceramic ball of the core-shell structure, and in this case, the ceramic ball of the core-shell structure may be utilized for odor adsorption.

1 is a flowchart illustrating a method of manufacturing a ceramic ball having a porous core-shell structure according to a first embodiment of the present invention.
2 is a cross-sectional view illustrating a structure of a ceramic ball having a porous core-shell structure according to a first embodiment of the present invention.
3 is a cross-sectional view of a process for manufacturing a core of a ceramic ball having a porous core-shell structure according to a first embodiment of the present invention.
4 is a cross-sectional view of a process of manufacturing a core of a ceramic ball having a porous core-shell structure according to a first embodiment of the present invention.
5 is a cross-sectional view of a process for drying a core of a ceramic ball having a porous core-shell structure according to a first embodiment of the present invention.
6 is a cross-sectional view of a process for forming a shell on the surface of the manufactured core of the porous core-shell structure according to the first embodiment of the present invention.
7 is a cross-sectional view of a process in which the shell is formed on the surface of the manufactured core of the porous core-shell structure according to the first embodiment of the present invention.
8 is a cross-sectional view illustrating a structure in which an intermediate layer is formed between a core and a shell of a porous core cell structure according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In this specification, when a component is referred to as being on another component, it means that it may be directly formed on the other component or a third component may be interposed therebetween. In addition, in the drawings, thicknesses of films and regions are exaggerated for effective description of technical content.

In addition, in various embodiments of the present specification, terms such as first, second, third, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. Accordingly, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Each embodiment described and illustrated herein also includes a complementary embodiment thereof. In addition, in this specification, 'and/or' is used in the sense of including at least one of the components listed before and after.

In the specification, the singular expression includes the plural expression unless the context clearly dictates otherwise. In addition, terms such as "comprise" or "have" are intended to designate that a feature, number, step, element, or a combination thereof described in the specification exists, but one or more other features, number, step, configuration It should not be construed as excluding the possibility of the presence or addition of elements or combinations thereof.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 to 7 , a ceramic ball having a core-shell structure and a method of manufacturing the same according to a first embodiment of the present invention will be described.

1 is a flowchart for manufacturing a ceramic ball having a core-shell structure, according to a first embodiment of the present invention, and FIG. 2 is a ceramic ball having a core-shell structure, according to a first embodiment of the present invention, and FIG. 3 is a view showing a process for manufacturing a core according to a first embodiment of the present invention, FIG. 4 is a view showing a core according to a first embodiment of the present invention, and FIG. 5 is a first embodiment of the present invention According to an example, it is a view showing a process of drying a core, FIG. 6 is a view showing a process of forming a shell on a core according to a first embodiment of the present invention, and FIG. It is a view showing a ceramic ball of a core-shell structure formed along the

1, 3, and 4 , the core 110 is manufactured by spraying and granulating the first solvent 180 on the first clay powder 120 ( S100 ).

As described above, the core 110 may be manufactured by spraying and granulating the first solvent 180 on the first clay powder 120 .

Specifically, the manufacturing of the core 110 includes grinding a first source block to produce the first clay powder 120 in a size of 20 to 44 μm, and the disk-shaped molding machine 170 is After providing the first clay powder 120 , the method may include spraying the first solvent 180 with a spray while giving vibration and/or rotation. For example, the first clay powder 120 may include diatomaceous earth, sepiolite, clay, and bentonite, and the first solvent 180 may be water. Also, for example, the diameter of the core 110 may be 1.5 mm to 2 mm.

According to an embodiment, the manufacturing of the first source block may include preparing a raw material having a porous, needle-like structure and a layered structure, wet mixing and pulverizing the raw material, and mixing and filtering the pulverized raw material and filter-pressing the filtered raw material to prepare the first source block. For example, the raw material may include porous diatomaceous earth, acicular sepirite, and layered clay and bentonite. According to another embodiment, the first source block may be manufactured by a method other than the above-described method.

1 and 5, the core 110 is dried (S200).

According to an embodiment, the core 110 may be dried with a dryer 200 .

Specifically, the method of drying the core 110 may include setting the temperature of the dryer 200 to 100° C. and loading the core 110 into the dryer 200 and drying for 3 hours. can According to another embodiment, the drying of the core 110 may be performed by other methods other than the above-described method.

1, 6, and 7, a shell surrounding the core 110 by providing and granulating the second clay powder 140 and the second solvent 190 to the dried core 110 (130) is manufactured (S300). Accordingly, the ceramic ball 150 having a core-shell structure including the core 110 and the shell 130 may be manufactured.

According to an embodiment, the method for manufacturing the shell 130 includes preparing the core 110 manufactured according to the present invention, and pulverizing the core 110 to a second source block. providing the second clay powder 140 together with the prepared second clay powder 140 to the ball molding machine 230, and providing the second solvent 190 to the core 110 and the second clay powder 140 and rotating them may include For example, the second clay powder 140 may include diatomaceous earth, sepiolite, clay, and bentonite, and the second solvent 190 may be water. In addition, the rotation speed of the ball forming machine 230 may be 100 rpm or less, and the diameter of the manufactured shell 130 may be 5 to 10 mm. When the rotation speed is increased to 100 rpm or more, the pores in the manufactured shell 130 are reduced, and the absorption rate and loading rate of the functional solution to be described later may be reduced.

According to an embodiment, the second clay powder 140 may be manufactured by pulverizing the second source block. The manufacturing of the second source block includes preparing a raw material including diatomaceous earth, sepiolite, clay and bentonite, wet mixing and pulverizing the raw material, mixing and Filtering the pulverized raw material, and filter-pressing the filtered raw material may include manufacturing the second source block. For example, the raw material may include porous diatomaceous earth, acicular sepirite, and layered clay and bentonite. Also, according to another embodiment, the second source block may be manufactured by a method other than the above-described method.

Also, according to an embodiment, a firing process may be performed on the ceramic ball 150 having the core-shell structure. Accordingly, strength and porosity of the ceramic ball 150 of the core-shell structure may be improved.

Alternatively, according to one modification, the firing process of the ceramic ball 150 having the core-shell structure may be omitted. In this case, basalt short fibers may be provided together with the second clay powder 140 during the manufacturing process of the shell 130 . Accordingly, the short basalt fibers may be provided in the shell 130 , and thus, the strength of the ceramic ball 150 having the core-shell structure may be improved.

As described above, after the first source block and the second source block are prepared with diatomaceous earth, sepirite, clay, and bentonite, the first source block and the second source block are pulverized, and the first The clay powder 120 and the second clay powder 140 may be manufactured. At this time, diatomaceous earth, sepirite, clay, and bentonite of the raw material may be uniformly mixed. At the same time, the crystal structures of porous diatomaceous earth, needle-shaped sepirite, and layered clay and bentonite, which are also mixed with the raw material in the first clay powder 120 and the second clay powder 140 , can be maintained. Accordingly, the crystal structure may be maintained in the core 110 and the shell 130 made of the first clay powder 120 and the second clay powder 140 . As a result, the absorption rate and the loading rate of the functional solution to be described later can be improved. In particular, as shown in FIG. 2 , the tube-shaped needle structure 115 of sepirite can be maintained, and thus, the functional solution can be released in a constant amount for a long period of time.

According to an embodiment, the first and second source blocks are pulverized to manufacture and granulate the first clay powder 120 and the second clay powder 140 without using an additive. Only the first solvent 180 and the second solvent 190 may be provided. As described above, the first solvent 180 and the second solvent 190 may be water. Accordingly, the process cost is reduced, the economical effect can be maximized, and an eco-friendly ceramic ball can be manufactured.

According to an embodiment, the ratio of sepierite may be higher in the second clay powder 140 than in the first clay powder 120 . Accordingly, the ratio of sepirite having a needle-like structure in the shell 130 may be higher than that of the core 110 . Due to this, the functional solution can be easily penetrated and supported in the shell 130 containing a large amount of sepierite having a needle-like structure, and the functional solution penetrated and supported in the shell 130 is not released in a large amount at once. and can be released at a substantially constant level for a long period of time. For example, the functional solution may be a solution having a fragrance.

In addition, according to an embodiment, 'compared to the core 110, the porosity of the shell 130 may be high. In other words, the core 110 may have a lower porosity than the shell 130 . Accordingly, the strength of the core 110 may be improved, and thus, damage to the core 110 may be minimized during the manufacturing process of the core 110 and the shell 130 . In addition, the shell 130 having a high porosity can absorb and support a large amount of the functional solution. As a result, the manufacturing yield of the ceramic ball 150 having the core-shell structure capable of absorbing and supporting a large amount of functional solution may be improved.

As described above, the shell 130 provides the core 110 and the second clay powder 140 to the ball forming machine 230 and sprays the second solvent 190, while the ball forming machine It may be manufactured by rotating the 230 . In the manufacturing process of the shell 130 , the rotational speed of the ball former 230 may be controlled, and the porosity of the shell 130 may be controlled according to the rotational speed of the ball former 230 . Specifically, as the rotational speed of the ball former 230 increases, the porosity of the shell 130 may decrease.

According to an embodiment, the rotation speed of the ball former 230 during the initial time may be faster than the rotation speed of the ball former 230 during the later time. In other words, in the manufacturing process of the shell 130 , the rotational speed of the ball forming machine 230 may be gradually slowed over time. Accordingly, the ball former 230 is rotated relatively quickly during the initial time, so that the shell 130 can be easily created, and the ball former 230 is rotated relatively slowly during the later time to rotate the shell 130 . ) is increased, so that a large amount of the functional solution can be easily loaded and absorbed into the shell 130 . That is, it can be easily utilized as a carrier of the ceramic ball 150 having the core-shell structure.

When the rotation speed of the ball forming machine 230 exceeds 100 rpm, the absorption rate of the functional solution of the ceramic ball may be 10% or less. Accordingly, according to an embodiment, the rotation speed of the ball forming machine 230 may be 100 rpm or less.

Alternatively, unlike the above, the loading and absorption of the functional solution may be omitted. That is, the pores in the ceramic ball 150 of the core-shell structure may be provided in an empty hollow state. In this case, the ceramic ball 150 having the core-shell structure may be used for odor adsorption.

According to an embodiment of the present invention, the core 110 is manufactured by spraying and granulating the first solvent 180 on the first clay powder 120 , and the second clay powder ( 140) and the second solvent 190 are provided and granulated to prepare the shell 130 surrounding the core 110, so that the ceramic ball 150 having the core-shell structure can be manufactured. Accordingly, it is possible to provide a method for manufacturing a ceramic ball in which the loading and absorption rates of the functional solution are improved, and the manufacturing process and cost are saved.

Hereinafter, a method of manufacturing a ceramic ball having a core-shell structure according to a second embodiment of the present invention will be described with reference to FIG. 8 .

8 is a cross-sectional view of a ceramic ball having a core-shell structure having an intermediate layer according to a second embodiment of the present invention.

Referring to FIG. 8 , according to the second embodiment of the present invention, in the first embodiment of the present invention described above, the intermediate layer 160 may exist between the core 110 and the shell 130 .

The intermediate layer 160 between the core 110 and the shell 130 may be formed using a third clay powder and a third solvent. The third clay powder may be prepared in the same manner as the first clay powder 120 and the second clay powder 140 described above. In addition, the third solvent may be water.

As described above, in the second clay powder 140 used to form the shell 130 than the first clay powder 120 used to form the core 110 , the ratio of sepirite is higher , thus, as compared to the core 110 , the shell 130 may contain a large amount of sepirite having a needle-like structure. In this case, due to the difference in the ratio of sepirite between the core 110 and the shell 130 and the ratio of the needle-like structure, the adhesive force between the core 110 and the shell 130 may be reduced. .

A ratio of sepirite in the third clay powder may be higher than that of the first clay powder 120 and lower than that of the second clay powder 140 . Accordingly, in the intermediate layer 160 made of the third clay powder, the ratio of sepiterite having a needle-like structure is higher than that of the core 110 made of the first clay powder 120, and the second clay It may be lower than the shell 130 made of powder 140 , and as described above, the intermediate layer 160 may be provided between the core 110 and the shell 130 . Accordingly, as described above, a decrease in adhesive strength between the core 110 and the shell 130 due to a difference in the ratio of sepirite having a needle-like structure is prevented, thereby providing a porous ceramic ball with improved durability.

Hereinafter, a method of manufacturing a ceramic ball having a core-shell structure according to a third embodiment of the present invention will be described.

According to the third embodiment of the present invention, a water-soluble polymer may be coated on the ceramic ball 150 having the core-shell structure on which the functional solution is supported. After coating the water-soluble polymer on the ceramic ball 150 of the core-shell structure on which the functional solution is supported, if the user provides moisture before using the ceramic ball 150 of the core-shell structure, the ceramic ball of the core-shell structure ( 150), the water-soluble polymer coated thereon may be dissolved by moisture. Accordingly, the ceramic ball 150 having the core-shell structure that prevents leakage of the functional solution while not in use and can be stored for a long time can be provided.

As mentioned above, although the present invention has been described in detail using preferred embodiments, the scope of the present invention is not limited to specific embodiments and should be construed according to the appended claims. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

110: core
120 Primary Clay Powder
130: shell
140: second clay powder
150 core-shell structure ceramic ball
160: middle layer
170: disk-shaped molding machine
175: rotation shaft
180: first solvent
190: second solvent
200: dryer
210: rotation direction
220: pedestal
230: ball forming machine

Claims (5)

preparing a core by spraying and granulating a first solvent on the first clay powder;
drying the core; and
A method of manufacturing a ceramic ball having a core-shell structure comprising the step of providing and granulating a second clay powder and a second solvent to the dried core to prepare a shell surrounding the core.
According to claim 1,
The manufacturing of the core comprises providing the first clay powder and the first solvent to a disk-shaped molding machine, and giving vibration to the disk-shaped molding machine,
The manufacturing of the shell includes providing the second clay powder and the second solvent to the ball molding machine to rotate the ball molding machine.
3. The method of claim 2,
The method of manufacturing a ceramic ball having a core-shell structure comprising that the rotational speed of the ball forming machine in the manufacturing of the shell is 100 rpm or less.
According to claim 1,
The method of manufacturing a ceramic ball having a core-shell structure, wherein the first clay powder and the second clay powder include at least one of diatomaceous earth, sepiolite, clay, and bentonite.
Manufacturing the ceramic ball of the core-shell structure according to claim 1; and
A method of manufacturing a ceramic ball for air purification comprising the step of supporting a functional solution in the pores of the ceramic ball having the core-shell structure.

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