KR20170014794A

KR20170014794A - Vacuum-insulated capsule using an inorganic material powder and the manufacturing method

Info

Publication number: KR20170014794A
Application number: KR1020150108689A
Authority: KR
Inventors: 서민덕
Original assignee: 서민덕
Priority date: 2015-07-31
Filing date: 2015-07-31
Publication date: 2017-02-08

Abstract

The present invention relates to a vacuum capsule using an inorganic substance powder and a method of manufacturing the same. More specifically, the present invention greatly improves the heat insulating performance by forming a capsule shape so as to vacuumize a large number of pores formed in an inorganic substance powder, The present invention relates to a vacuum capsule using an inorganic substance powder and a method for producing the same.
According to the present invention, it is possible to greatly improve the heat insulating performance by forming a capsule shape in which a large number of pores of the inorganic substance powder are evacuated and a coating layer is formed on the surface thereof to maintain the vacuum state, Show an effect.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum capsule using an inorganic material powder,

The present invention relates to a vacuum capsule using an inorganic substance powder and a method of manufacturing the same. More specifically, the present invention greatly improves the heat insulating performance by forming a capsule shape so as to vacuumize a large number of pores formed in an inorganic substance powder, The present invention relates to a vacuum capsule using an inorganic substance powder and a method for producing the same.

In general, vacuum insulation is a high-performance insulation material that utilizes the low thermal conductivity characteristics of vacuum, and can be used for refrigerator, freezer, refrigerator container, and building panel. Prior art related to such a vacuum insulation material is disclosed in Korean Patent Laid-Open Publication No. 10-2013-0095077, which discloses a core material for a vacuum insulation material using a high purity fumed silica and a vacuum insulation material using the same.

With reference to this publication, a vacuum insulation panel is fabricated in the form of a panel having a predetermined thickness, and the vacuum insulation panel is manufactured by sealing a core by placing a core material in a hollow outer covering material and vacuum- Silica and inorganic material powders are used. The fumed silica or the inorganic material powder used as a core material has many pores per se. The pores are filled with air. The pores are filled with air, Could not be vacuumed. Therefore, in order to produce a vacuum insulator, it is necessary to provide an outer shell material. Therefore, it has been difficult to achieve various forms of using the fumed silica or inorganic powder, that is, diversification of use.

In recent years, attempts have been made to solve the above-mentioned disadvantages by forming a new molded product using expanded polystyrene particles. That is, Korean Patent Laid-Open No. 10-2011-0126484 discloses a high-performance expanded polystyrene molded article, which is produced by forming a coating layer on the surface of foamed polystyrene to solve the problem of flame retardancy, The moldings are produced directly through the particles. This is advantageous in that it can diversify usage of various types of conventional techniques described above, but the foamed polystyrene has a disadvantage in that it has poor heat insulation and soundproofing performance as compared with the above-mentioned fumed silica or inorganic powder.

Disclosure of the Invention The present invention has been conceived to solve the problems described above. It is an object of the present invention to improve the heat insulation performance and to diversify the use by forming a capsule in the form of a large number of pores formed in the powder of the inorganic material, And a method of manufacturing the vacuum capsule.

According to an aspect of the present invention, And a coating layer formed to entirely cover the surface of the inorganic substance powder, wherein pores formed in the inorganic substance powder are in a vacuum state.

Preferably, the inorganic material powder is any one selected from hydrophobic aerogels powder, hydrophilic aerogels powder, carbon aerogels powder, aerographite powder, graphene aerogel powder, fiber aerogels powder, zeolite powder, expanded vermiculite powder and micro-lattice powder do.

Preferably, the coating layer is formed of a solution of at least one of a polymer polymer solution and a ceramic inorganic solution.

Preferably, the polymer polymer solution is any one selected from the group consisting of a urethane solution, an acrylic emulsion solution, a silicon solution, and an organic material including a rubber solution.

Preferably, the ceramic inorganic solution is any one selected from the group consisting of sodium silicate, potassium silicate, alumina sol, silica sol, colloidal silica, lithium silicate and modified silica.

Preparing an inorganic substance powder having a plurality of pores formed therein; A mixing step of mixing a mixed liquid to the powder of inorganic material so that the mixed liquid adheres to the surface of the powder, and performing a vacuum treatment before mixing with the mixed liquid so that a large number of pores formed in the inorganic material powder are in a vacuum state; A coating step of forming a coating layer as a whole on the surface of the inorganic substance powder; And drying the inorganic substance powder in which the coating layer is formed, wherein the mixed solution adhering to the surface of the powder is evaporated or evaporated, and the coating layer is firmly attached to the powder surface while being dried to maintain the pores in a vacuum state. .

Preferably, the mixed solution used in the mixing step is one selected from the group consisting of alcohol and water.

Preferably, the drying step is any one selected from an indirect heat source drying method, a hot air drying method, and a far infrared ray drying method.

Preferably, the drying step is characterized in that the inorganic powder coated through the spray gun is dried by a heat source while being sprayed into the drying chamber.

Preferably, the dried inorganic material powder is prepared by dispersing / grinding the dried inorganic material powder.

Preferably, the method further comprises a pretreatment step of spraying and curing the coated inorganic material powder with a curing solution before the drying step.

According to the present invention, it is possible to greatly improve the heat insulating performance by forming a capsule shape in which a large number of pores of the inorganic substance powder are evacuated and a coating layer is formed on the surface thereof to maintain the vacuum state, Show an effect.

1 is an enlarged sectional view showing a vacuum capsule using an inorganic substance powder according to a preferred embodiment of the present invention.
2 is a schematic view showing a process for producing a vacuum capsule using inorganic powder according to a preferred embodiment of the present invention.
3 is a schematic view showing a drying process according to another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a vacuum capsule using inorganic powder of the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of terms in order to describe their invention in the best way. It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

1 is an enlarged cross-sectional view showing a vacuum capsule using an inorganic substance powder according to a preferred embodiment of the present invention.

Referring to the drawings, the vacuum capsule 100 of the present invention includes an inorganic powder 110 and a coating layer 120.

The inorganic material powder 110 may be a granular powder or bead in which numerous pores 112 are formed and may have a size of nano, micro, or millimeter. The inorganic powder 110 may be a hydrophobic airgel powder, a hydrophilic airgel powder, Airgel powder, aerographite powder, graphene aerogel powder, fiber aerogel powder, zeolite powder, expanded vermiculite powder, and micro-lattice powder. Among them, it is most preferable to use airgel powder, because the aerogel powder is the lightest solid developed by mankind and has the most excellent heat insulating property. The reason for having super insulation is that the pore ratio is about 95% And it is preferable to use such a material.

The coating layer 120 entirely covers the surface of the inorganic material powder 110, and the coating layer 120 is formed by applying or mixing a solution of a polymeric polymer solution or a ceramic inorganic solution.

The polymeric polymer solution may be selected from the group consisting of a urethane solution, an acrylic emulsion solution, a silicone solution, and an organic material including a rubber solution. The ceramic inorganic solution may be selected from the group consisting of sodium silicate, potassium silicate, alumina sol, silica sol, It is preferably selected from the group consisting of silica, lithium silicate, and modified silica. Of course, it should be appreciated that the polymer polymer solution and the ceramic mineral solution are not referred to, but are well known in the art.

The numerous pores 112 formed in the inorganic powder 110 are maintained in a vacuum state by the coating layer 120, thereby ensuring high-performance heat insulation due to low heat conduction. The capsule particles 100 thus formed may be mixed with a polymer solution and mixed and stirred with fibers or paints to be an interior material or a coating material of the building. The capsule particles 100 may be manufactured in a separate plate form, and their shapes and uses are not limited.

The reason why the pores 112 of the inorganic substance powder 110 are in a vacuum state and maintained in that state will be described in detail through the following manufacturing method.

2 is a schematic process diagram showing a process for producing a vacuum capsule using an inorganic substance powder according to a preferred embodiment of the present invention, and FIG. 3 is a schematic view showing a drying process according to another embodiment of the present invention Fig.

Referring to FIG. 2, the vacuum capsule 100 of the present invention is largely manufactured through a four-step process.

First, as a preparation step, it is a step of preparing an inorganic material powder 110 or a bead in which numerous pores 112 are formed as shown in FIG. At this time, as the inorganic material powders 110 to be used, hydrophobic airgel powder, hydrophilic airgel powder, carbon aerogel powder, aerographite powder, graphene aerogel powder, fiber aerogel powder, zeolite powder, expanded vermiculite powder and micro lattice powder &Lt; / RTI > Among them, it is most preferable to use airgel powder, because the aerogel powder is the lightest solid developed by mankind and has the most excellent heat insulating property. The reason for having super insulation is that the pore ratio is about 95% And the use of such a material is excellent in heat insulation.

Second, in the mixing process, the inorganic substance powder 110 is put into the stirrer 200 and mixed with the mixed solution A, as shown in "B", to form a mixed solution A on the surface of the inorganic substance powder 110 . It is preferable that the inorganic substance powder 110 in the stirrer 200 is vacuum-treated before the mixing with the mixed solution A to evacuate numerous pores of the inorganic substance powder 110. It is preferable that the stirrer 200 is provided in the vacuum chamber.

The mixed solution (A) is preferably an alcohol having excellent volatility, but water to be evaporated upon drying is sufficient. For example, when the inorganic substance powder 110 is hydrophobic, alcohol may be used, and when the inorganic substance powder 110 is hydrophilic, water may be used. It is also apparent that water and alcohol may be mixed with each other.

As a result, when the mixed liquid (A) composed of alcohol or water and the inorganic powder (110) are mixed, not only the mixed liquid (A) is adhered to the surface but also a part of the mixture flows into the vacuum pores.

Third, the coating process is a process of forming the coating layer 120 on the entire surface of the inorganic material powder 110 that has been subjected to the mixing process, as shown in " It can be seen that a coating layer 120 having a predetermined thickness is formed on the surface of the inorganic material powder 110. At this time, even though the inorganic material powder 110 has a hydrophobic property, the coating layer 120 can be easily formed because the mixed solution A is adhered to the surface.

The solution for forming the coating layer 120, that is, the coating liquid (B), may be selected from a solution of at least one of a polymeric polymer solution and a ceramic inorganic solution. When at least one of the above-mentioned solutions is mixed with the inorganic powder 110 by putting it in the stirrer 200, a coating layer 120 having a predetermined thickness may be formed on the surface thereof. In this process, the coating liquid (B) can not enter the pores (112) due to the mixed liquid (A) adhered to the surface, and the coating layer (120) is formed on the surface thereof.

The polymeric polymer solution may be any one selected from the group consisting of a urethane solution, an acryl emulsion solution, a silicone solution and a rubber solution. The ceramic inorganic solution may be selected from the group consisting of sodium silicate, potassium silicate, alumina sol, silica sol, colloidal silica , Lithium silicate, and modified silica are preferably used.

Fourthly, in the drying process, the inorganic substance powder 110 having the coating layer 120 formed thereon is dried in the dryer 300, and the mixed solution A adhering to the surface of the inorganic substance powder 110 is evaporated or evaporated And the coating layer 120 is dried. That is, the structure is loose before the coating layer 120 completely covering the surface of the inorganic material powder 110 is loosened. Therefore, when the coating layer 120 is dried in this state, the mixed solution A adhered to the surface of the powder 110, The coating layer 120 is also dried (cured), and the loose tissue is slowly contracted, that is, self-healed and becomes strong, thereby blocking the inflow of external air, So that the pores 112 of the powder 110 remain in a vacuum state.

The drying of the inorganic material powder 110 may be performed by an indirect heat source drying method, a hot air drying method, or a far infrared ray drying method. Of these, the far infrared ray drying method capable of drying from the inside of the dried object is most preferable something to do. In order to speed up the drying (volatilization, evaporation) of the mixed liquid A adhered to the inside of the coating layer 120 constituting the outer skin regardless of the selection of the drying method, the drying is carried out while raising the temperature gradually from a low temperature to a high temperature desirable. For example, drying is started at 30 to 40 ° C through a far-infrared drying method, the filled filler (A) filled in the inside is first dried, and the temperature is raised to 100 to 150 ° C to completely dry the coating layer (120) It is preferable to complete the capsule 100.

Meanwhile, in the drying process, the coating layer 120 surrounding the inorganic powder 110 coagulates with the other coating layer 120, so that a part of the particles may be formed into a lump, The inorganic powder 110 itself is small and thus the inorganic powder 110 itself is not pulverized in the pulverizing or dispersing process described above. It is natural that pulverization is performed by adjusting the inorganic substance powder 110 to such an extent that the inorganic substance powder 110 is not crushed. In addition, the coating layer 120 formed on the surface of the inorganic powder 110 may not be uniform in the dispersion process in which the inorganic powder particles 110 are separated from each other. The pores 112 are kept in a vacuum state. If the thickness is large, it is advantageous, but if the thickness is thin, it is not a big problem. It will be appreciated that most of the pores 112 are kept vacuum even if some of the pores are filled with air again, thereby improving the heat insulating performance rather than the conventional powder that is not vacuum-encapsulated.

Here, the drying process is a method in which a plurality of inorganic material powders 110 are put in a dryer 300 and dried. As described above, some of the inorganic materials may be aggregated to form a lump, A drying method may be used in which the powder 110 is sprayed (sprayed) using a spray gun S to dry and prevent aggregation.

3, a hose (not shown) of the spray gun S is connected to a reservoir (not shown) for storing the coated inorganic material powder 110, and a high temperature dryer 300a is connected to the hose The inorganic material powders 110 are sprayed in a dispersed state so that they can be individually dried without being agglomerated with each other. The drying method can prevent the inorganic material powders 110 from being coagulated with each other, so that there is an advantage that a pulverizing process is unnecessary.

And a pretreatment step for spraying and spraying the coated powder into the curing solution before the drying step so that drying can be performed.

Since the pores 112 formed in the inorganic powder 110 are in a vacuum state, the capsule 100 of the present invention manufactured by the above-described method is low in thermal conductivity and can be used as a heat insulating material having excellent performance. In addition, since the capsule 100 has a shape, it is not limited to a specific shape but can be widely applied to various shapes and various fields.

The capsule of the present invention having the above-described structure will be described in the following examples.

Example 1

As the inorganic substance powder 110 used in Example 1 of the present invention, a hydrophobic aerogel powder, an alcohol as a mixed solution A and a urethane solution as a polymer solution were used as a coating solution B to be a coating layer 120, 100 g of the inorganic substance powder, 100 g of the alcohol and 100 g of the urethane solution were prepared. Of course, the present invention is not limited to the above-mentioned weight parts, and it is possible to select from 100 to 150 parts by weight of alcohol and from 50 to 100 parts by weight of the urethane solution based on 100 parts by weight of the inorganic material fraction.

First, the prepared inorganic substance powder 110 is put into a stirrer 200 in a vacuum chamber (not shown), and the air filled in the pores 112 is removed to be in a vacuum state. The alcohol (A) After sufficiently mixing, it was confirmed that the inorganic substance powder 110 was in the paste state and the alcohol was adhered to the surface, that is, it was burnt (see "B" in FIG. 2).

Subsequently, the urethane solution was added and the mixture was sufficiently stirred with the inorganic material powder 110 to form a coating layer 120 having a predetermined thickness on the surface of the inorganic material powder 110 (refer to FIG. 2)

In this state, the inorganic material powder 110 was put into a far-infrared ray dryer, dried for 30 minutes at first at 40 DEG C in a thin state, then heated to 130 DEG C for 30 minutes and then pulverized by an unshown pulverizer The powders agglomerated in the drying process were pulverized to prepare the capsules of the present invention (see "La" in FIG. 3).

In order to determine whether the numerous pores 112 of the inorganic powder 110 constituting the capsule particle 100 of the present invention thus manufactured were in a vacuum state, the capsule particles 100 of the present invention and the airgel powder were coated with the same thickness And the heat conductivity was as shown in the following table.

Insulation made of airgel particles Insulation made from capsule particles Thermal conductivity
(W / MK) 0.030 0.018

As shown in the above table, it can be seen that the conductivity is low in the heat insulator made of the capsule particle 100 of the present invention. A low thermal conductivity means that the insulation is that much better. As a result, it can be understood that the pores 112 of the inorganic particle 110 constituting the capsule particle 100 of the present invention maintain a vacuum state.

On the other hand, a large number of heat insulating materials made of the airgel particles to be compared were measured and found to have a thermal conductivity ranging from 0.028 to 0.030 w / mk. The heat insulating material made of the capsule particles of the present invention had a range of 0.018 to 0.020 w / This difference arises from the fact that the same amount of airgel particles or capsule particles are not uniformly applied, and in any case, it is low in the heat insulator made using the capsule particles of the present invention.

Example 2

The inorganic substance powder 110 used in Example 2 of the present invention used expanded volumic powder, water as the mixed solution (A), and sodium silicate solution as the ceramic solution (B) as the coating solution (B) 100 g of inorganic substance powder, 100 g of water and 100 g of sodium silicate solution were prepared. Of course, the present invention is not limited to the above-mentioned weight parts.

First, the prepared inorganic substance powder 110 was put into a vacuum chamber (not shown), and the air filled in the pores 112 was removed to be in a vacuum state. Water as the mixture liquid (A) was added to the chamber, It was confirmed that water was adhered to the surface of the inorganic substance powder 110 while being in a paste state (refer to "B" in FIG. 2).

Subsequently, a sodium silicate solution was added and stirred sufficiently, and a coating layer 120 having a predetermined thickness was formed on the surface of the inorganic material powder 110 (refer to "D" in FIG. 2).

In this state, the inorganic substance powder 110 was put into a far-infrared ray drier and dried for 30 minutes at the initial 40 ° C in a thin state. The temperature was gradually raised to 150 ° C and dried for 20 minutes, followed by pulverization through a pulverizer. (See "a" in Fig. 3)

The capsule thus obtained had a slightly higher thermal conductivity of 0.034 w / mk than that of Example 1, which is considered to be due to the difference in porosity of the inorganic fluorine powder, which is lower than 0.038 w / mk It came out low.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the claims of the invention to be described below may be better understood. Additional features and advantages that constitute the claims of the present invention will be described in detail below. It should be appreciated by those skilled in the art that the disclosed concepts and specific embodiments of the invention can be used immediately as a basis for designing or modifying other structures to accomplish the invention and similar purposes.

It is also to be understood that such modified or altered equivalent structures by those skilled in the art as a basis for modifying or designing the invention to the other structures for carrying out the same purpose of the invention disclosed in the present invention, It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit or scope of the invention as defined by the appended claims.

100: Capsule particle 110 of the present invention: inorganic substance powder
112: pore 120: coating layer
A: mixed solution B: coating solution
200: stirrer 300: dryer
S: Spray Gun

Claims

An inorganic material powder having a plurality of pores formed therein; And
And a coating layer formed to entirely cover the surface of the inorganic substance powder,
Wherein the pores formed in the inorganic substance powder are in a vacuum state.

The method according to claim 1,
Wherein the inorganic material powder is any one selected from hydrophobic airgel powder, hydrophilic airgel powder, carbon aerogel powder, airgel graphite powder, graphene aerogel powder, fiber aerogel powder, zeolite powder, expanded vermiculite powder and micro-lattice powder. Vacuum capsules using powdered materials.

The method according to claim 1,
Wherein the coating layer is formed of a solution of at least one of a polymer polymer solution and a ceramic inorganic solution.

The method of claim 3,
Wherein the polymer polymer solution is one selected from the group consisting of a urethane solution, an acrylic emulsion solution, a silicone solution, and an organic material including a rubber solution.

The method of claim 3,
Wherein the ceramic inorganic solution is one selected from the group consisting of sodium silicate, potassium silicate, alumina sol, silica sol, colloidal silica, lithium silicate, and modified silica.

A preparation step of preparing an inorganic substance powder having a plurality of pores formed therein;
A mixing step of mixing a mixed liquid to the powder of inorganic material so that the mixed liquid adheres to the surface of the powder, and performing a vacuum treatment before mixing with the mixed liquid so that a large number of pores formed in the inorganic material powder are in a vacuum state;
A coating step of forming a coating layer as a whole on the surface of the inorganic substance powder; And
A drying step of drying the inorganic substance powder, wherein the mixed solution adhering to the surface of the powder is volatilized or evaporated, and the coating layer is firmly attached to the powder surface while being dried to maintain the pores in a vacuum state;
The method of manufacturing a vacuum capsule using the inorganic substance powder according to claim 1,

The method according to claim 6,
Wherein the mixed solution used in the mixing step is selected from the group consisting of alcohol and water.

The method according to claim 6,
Wherein the inorganic material powder is any one selected from hydrophobic airgel powder, hydrophilic airgel powder, carbon aerogel powder, airgel graphite powder, graphene aerogel powder, fiber aerogel powder, zeolite powder, expanded vermiculite powder and micro-lattice powder. A method for manufacturing a vacuum capsule using a substance powder.

The method according to claim 6,
Wherein the coating layer is formed of a polymeric polymer solution or a ceramic inorganic solution.

The method according to claim 6,
Wherein the polymeric polymer solution is one selected from the group consisting of a urethane solution, an acrylic emulsion solution, a silicone solution, and an organic material including a rubber solution.

The method according to claim 6,
Wherein the ceramic inorganic solution is one selected from the group consisting of sodium silicate, potassium silicate, alumina sol, silica sol, colloidal silica, lithium silicate, and modified silica.

The method according to claim 6,
Wherein the drying step is selected from the group consisting of an indirect heat source drying method, a hot air drying method, and a far infrared ray drying method.

13. The method of claim 12,
Wherein the inorganic powder coated through the spray gun is dried by a heat source while being sprayed by a drier.

13. The method of claim 12,
Wherein the dried inorganic material powder is dispersed / pulverized in the drying step, thereby producing a vacuum capsule using the inorganic material powder.

The method according to claim 6,
Further comprising a pretreatment step of spraying and curing the coated inorganic material powder with a curing solution prior to the drying step.