KR101071879B1 - Vacuum glass panel having spacer and manufacturing method thereof - Google Patents

Abstract

A vacuum glass panel is disclosed. The vacuum glass panel according to the present invention is disposed between a first glass plate, a second glass plate which is edged to the first glass plate, and is disposed to face the first glass plate with a vacuum space therebetween, and between the first glass plate and the second glass plate. And a plurality of spacers spaced apart from each other by the first glass plate and the second glass plate. The plurality of spacers are formed of glass including alumina (Al ₂ O ₃ ) particles and silica (SiO ₂ ) particles.

Description

Insulating vacuum glass panel including spacer and manufacturing method thereof {VACUUM GLASS PANEL HAVING SPACER AND MANUFACTURING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum glass panel, and more particularly, to a vacuum glass panel having a plurality of spacers disposed in a vacuum space between two glass plates and supporting an external force, and a method of manufacturing the same.

The vacuum glass panel has a structure in which a vacuum space is formed between two glass plates, and is attracting attention as a window material of the future due to its excellent thermal insulation performance. Vacuum glass panels are subject to complex mechanical stresses such as atmospheric pressure, temperature differences between inside and outside, and wind. In order to overcome this mechanical stress and maintain the gap between the two glass plates, the arrangement of the support, i.e., the spacer, is essential.

The spacer itself must have a high compressive strength to effectively support the pressure at which atmospheric pressure is pressed and must be firmly fixed in the designated position. In addition, it is important for vacuum glass panels to simplify the manufacturing process and to reduce manufacturing costs by lowering manufacturing equipment costs.

As a conventional method for forming a spacer, there is a method of partially applying a glass bond liquid onto a glass plate, dispersing the spacer, and fixing the spacer at the glass bond liquid application position. However, in this method, missing or misaligned spacers frequently occur, which may lead to product defects. In the case of a large-area vacuum glass panel, a method is also known in which a lattice-shaped spacer is disposed between two sheets of glass, and the glass plate and the spacer are bonded together using an ultrasonic wave or a laser beam in an electric furnace in a vacuum atmosphere. However, this method requires expensive equipment and the manufacturing process is complicated.

On the other hand, the stress applied to the glass plate is drastically changed depending on the arrangement form and spacing of the spacers. If the spacer fails to uniformly support the external pressure throughout the vacuum glass panel, cracks may occur due to the stress of the glass plate itself due to pressure drop. In addition, tensile stress occurs near the spacers in the outer surface of the glass plate, and self-destruction occurs when the tensile stress exceeds the maximum allowable tensile stress.

Therefore, in consideration of the stress distribution applied to the glass plate, studies on the optimum arrangement and arrangement of spacers for improving the mechanical strength of the vacuum glass panel or maintaining the mechanical strength of the vacuum glass panel with the minimum number of spacers are required. .

The present invention is to provide a vacuum glass panel by increasing the compressive strength of the spacer to improve the bearing capacity of the spacer, and in consideration of the stress distribution applied to the glass plate, the shape characteristics of the spacer, the arrangement form and the spacing of the spacer is optimized.

The present invention is to provide a method of manufacturing a vacuum glass panel that can easily arrange the spacer on a large area glass plate, to firmly fix the spacer without missing or misalignment at a designated position, to simplify the manufacturing process and lower the manufacturing cost .

According to an embodiment of the present invention, a vacuum glass panel includes a first glass plate, a second glass plate having an edge contacting the first glass plate, and disposed to face the first glass plate with a vacuum space therebetween, and the first glass plate and the first glass plate. And a plurality of spacers disposed between the two glass plates to separate the first glass plate and the second glass plate from each other. The plurality of spacers are formed of glass including alumina (Al ₂ O ₃ ) particles and silica (SiO ₂ ) particles.

The content of alumina (Al ₂ O ₃ ) particles may be higher than the content of silica (SiO ₂ ) particles.

The plurality of spacers may further include titanium dioxide (TiO ₂ ) particles.

The content of alumina (Al ₂ O ₃ ) particles may be higher than the content of silica (SiO ₂ ) particles, and the content of silica (SiO ₂ ) particles may be higher than that of titanium dioxide (TiO ₂ ) particles.

The size of the alumina (Al ₂ O ₃ ) particles may be 1 ㎛ to 10 ㎛.

The plurality of spacers may be directly bonded to any one of the first glass plate and the second glass plate. The plurality of spacers may be formed in any one of a cylinder and a polyhedral pillar.

The plurality of spacers may have a height of 50 μm to 1,000 μm. The plurality of spacers may have an average diameter of 100 μm to 1,000 μm.

The plurality of spacers may be arranged in any one form selected from the group consisting of rectangles, rhombuses, squares, and hexagons. In addition, the plurality of spacers may be arranged in a square shape.

The first glass plate and the second glass plate have the same thickness, and the first glass plate, the second glass plate, and the plurality of spacers may satisfy the following conditions.

D ≤ 7t + 6mm

Here, t is the thickness (mm) of a 1st glass plate, and D represents the distance (mm) between some spacer.

According to one or more exemplary embodiments, a method of manufacturing a vacuum glass panel includes preparing a spacer paste and screen printing the paste on one of the first and second glass plates to form a plurality of spacers. And laminating a first glass plate and a second glass plate with a plurality of spacers interposed therebetween, and sealing the edges of the first glass plate and the second glass plate and exhausting an inner space to form a vacuum space.

The paste may include one or more compounds selected from the group consisting of water glass and silica sol, alumina (Al ₂ O ₃ ) powder, silica (SiO ₂ ) powder, and a glidant.

The paste may further include titanium dioxide (TiO ₂ ) powder, the content of alumina (Al ₂ O ₃ ) powder in the paste is higher than the content of silica (SiO ₂ ) powder, the content of silica (SiO ₂ ) powder It may be more than the content of titanium dioxide (TiO ₂ ) powder.

The paste may include 40 wt% to 50 wt% of at least one compound selected from the group consisting of water glass and silica sol, 20 wt% to 30 wt% of alumina (Al ₂ O ₃ ) powder, and 15 wt% to 20 wt% of silica (SiO ₂ ) powder. , And 5 wt% to 10 wt% of a fluidizing agent.

The paste may have a viscosity of 2,000 cps to 20,000 cps.

By increasing the compressive strength of the spacer to improve the bearing capacity of the spacer, it is possible to effectively overcome the complex stress applied to the vacuum glass panel by increasing the mechanical strength of the vacuum glass panel. In addition, the spacers can be easily disposed on the large-area glass plate, and the spacers can be firmly fixed without missing or misalignment at designated positions, simplifying the manufacturing process and lowering the manufacturing cost.

1 is a partial cutaway perspective view of a vacuum glass panel according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the vacuum glass panel shown in FIG. 1.
3 is a schematic perspective view illustrating a first glass plate and a spacer in the vacuum glass panel illustrated in FIG. 1.
4A to 4E are schematic views showing various arrangements of spacers.
FIG. 5 is a schematic diagram illustrating an expanded state of a pentagonal pattern of the spacer illustrated in FIG. 4D.
6 is a flow chart showing step by step the manufacturing process of the vacuum glass panel according to an embodiment of the present invention.
FIG. 7 is a schematic perspective view illustrating a second step in the manufacturing process of the vacuum glass panel illustrated in FIG. 6.
FIG. 8 is a schematic cross-sectional view showing a third step in the manufacturing process of the vacuum glass panel shown in FIG. 6.
FIG. 9 is a schematic cross-sectional view showing a fourth step in the manufacturing process of the vacuum glass panel shown in FIG. 6.
10 is a graph showing a strain-stress curve of a spacer according to the present embodiment including alumina particles and silica particles.
11 is a graph showing a strain-stress curve of a spacer according to a comparative example including no alumina particles and silica particles.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a partial cutaway perspective view of a vacuum glass panel 100 according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the vacuum glass panel 100 shown in FIG.

1 and 2, the vacuum glass panel 100 includes a first glass plate 10, a second glass plate 20 disposed to face the first glass plate 10, a first glass plate 10, and a first glass plate 10. It includes a plurality of spacers 30 disposed between the two glass plates 20. The edges of the first glass plate 10 and the second glass plate 20 abut each other to seal the space between the two glass plates 10 and 20.

The first glass plate 10 and the second glass plate 20 may be ordinary plate glass or tempered glass. The plurality of spacers 30 have the same shape and size as each other and are regularly arranged at a predetermined distance from each other. The spacer 30 is disposed between the first glass plate 10 and the second glass plate 20 to space the two glass plates 10 and 20 from each other. The 1st glass plate 10 and the 2nd glass plate 20 are not limited to a specific kind of glass.

Edges of the first glass plate 10 and the second glass plate 20 may abut each other by torch heating. That is, when the edges of the first glass plate 10 and the second glass plate 20 laminated with the spacer 30 interposed therein are heated by a torch, the edges of the two glass plates 10 and 20 are melted, and then hardened and bonded to each other.

Although not shown, a separate sealing material, for example, low melting point glass, may be disposed at an edge between the first glass plate 10 and the second glass plate 20. In this case, a separate sealing layer is formed between the first glass plate 10 and the second glass plate 20, and the sealing layer melts at a predetermined temperature and then hardens to bond the two glass plates 10 and 20.

The exhaust hole 51 is formed in any one of the 1st glass plate 10 and the 2nd glass plate 20, The cap member 52 is fixed to this glass plate, and the exhaust hole 51 is sealed. The exhaust hole 51 is connected to an exhaust device (not shown) in the manufacturing process and used to exhaust the internal space of the vacuum glass panel 100. Therefore, the internal space in which the plurality of spacers 30 are positioned becomes the vacuum space 60, and the vacuum glass panel 100 has a high thermal insulation performance by the vacuum space 60.

In the vacuum glass panel 100 of the present embodiment, the spacer 30 includes a basic glass component, alumina (Al ₂ O ₃ ) particles and silica (SiO ₂ ) particles for improving compressive strength. In addition, the spacer 30 may further include titanium dioxide (TiO ₂ ) particles. At this time, the content of the alumina particles is more than the content of the silica particles, the content of the silica particles is more than the content of the titanium dioxide particles.

The size of the alumina (Al ₂ O ₃ ) particles may be approximately 1 ㎛ to 10 ㎛. If the size of the alumina (Al ₂ O ₃ ) particles is less than 1㎛ may reduce the reinforcing function to harden the spacer 30, if it exceeds 10㎛ the alumina (Al ₂ O ₃ included in the spacer 30) Since the content of the particles is reduced, the structural safety of the spacer 30 may also be reduced.

Silica (SiO ₂ ) particles and titanium dioxide (TiO ₂ ) particles fill the void space between the alumina (Al ₂ O ₃ ) particles to make the spacer 30 harder.

The spacer 30 may include a paste including at least one of water glass and silica sol, alumina (Al ₂ O ₃ ) powder, and silica (SiO ₂ ) powder in any one of the first glass plate 10 and the second glass plate 20. It can be manufactured by directly screen printing a columnar shape on a glass plate and then drying it. The paste may further include titanium dioxide (TiO ₂ ) powder. The formation method of the specific spacer 30 is mentioned later.

The main component of the spacer 30 may be sodium silicate (sodium silicate). Sodium silicate is applied on a glass plate in the state of water glass and dried to maintain a solid state.

Alumina (Al ₂ O ₃ ) is a representative fine ceramics, has high mechanical strength and wear resistance, and has excellent thermal and chemical stability. Alumina (Al ₂ O ₃ ) particles function to increase the compressive strength of the spacer 30 to improve the bearing capacity of the spacer 30. That is, the spacer 30 including alumina (Al ₂ O ₃ ) particles realizes higher compressive strength as compared with the case where the spacer 30 is composed of glass only.

Silica (SiO ₂ ) particles and titanium dioxide (TiO ₂ ) particles reduce the voids in the spacer 30 to increase the compressive strength of the spacer 30. As silica (SiO ₂ ) particles, a precipitate formed by neutralizing water glass with an acid may be used. In addition, since the silica (SiO ₂ ) particles are a component such as glass, which is a main component of the spacer 30, the silica (SiO ₂ ) particles also serve as an extender of the spacer 30.

The spacer 30 may be formed in various shapes such as a cylinder or a polyhedral pillar. Polyhedral columns include various forms, such as square columns, rectangular columns, rhombus columns, pentagonal columns, and hexagonal columns. In FIG. 1, a cylindrical spacer 30 is illustrated as an example.

The height of the spacer 30 may be 50 μm to 1,000 μm, and the average diameter of the spacer 30 may be 100 μm to 1,000 μm. If the height of the spacer 30 is less than 50 μm, the heat insulating effect is lowered, and a defect in which the first glass plate 10 and the second glass plate 20 adhere to each other may occur. On the other hand, when the height of the spacer 30 exceeds 1,000 μm, it is difficult to manufacture the spacer 30 having a narrow diameter while maintaining the specified compressive strength.

Since the spacer 30 serves as a passage through which heat is transferred, as the average diameter of the spacer 30 increases, heat is easily transmitted between the first glass plate 10 and the second glass plate 20 through the spacer 30. On the other hand, when the average diameter of the spacer 30 is less than 100 μm, the first glass plate 10 and the second glass plate 20 are in point contact with each other, and thus the spacer 30 and the first and second glass plates 10 and 20 are in contact with each other. There is a stress problem in between. Considering these matters and manufacturing problems, if the average diameter of the spacer 30 satisfies the range of 100 μm to 1,000 μm, heat transfer and stress problems may be solved.

Since the above-described spacer 30 is itself dried after screen printing on any one glass plate without a separate adhesive material between the first glass plate 10 and the second glass plate 20, the spacer 30 is integrated with the glass plate during the drying process. Is fixed. Accordingly, the spacer 30 is firmly fixed at the designated position.

3 is a schematic perspective view illustrating a first glass plate and a spacer in the vacuum glass panel illustrated in FIG. 1.

In FIG. 3, the thickness of the first glass plate 10 is represented by t, and the distance between the spacers 30 in one direction (for example, the horizontal direction) of the first glass plate 10 is d1 and the first glass plate 10. The distance between the spacers 30 along the other direction (for example, the vertical direction) of) is denoted by d2. At this time, the second glass plate (not shown) also has the same thickness as the first glass plate 10.

Tensile stress is generated in the vacuum glass panel 100 due to a pressure difference between an internal vacuum pressure and an external atmospheric pressure. Hereinafter, a method of optimizing the arrangement and arrangement interval of the spacer 30 in consideration of the stress distribution applied to the vacuum glass panel 100 will be described.

Tensile stress is generated at an intermediate point between the spacer 30 and the spacer 30 of the inner surface of the two glass plates 10, 20 and the portion of the outer surface of the two glass plates 10, 20 that are supported by the spacer 30. do. Maximum tensile stress occurs near the spacer 30 of the two glass plates 10, 20. The maximum allowable tensile stress occurring in the vacuum glass panel 100 is limited to 8 MPa, and if this value is exceeded, self fracture occurs in the vacuum glass panel 100.

4A to 4E illustrate various arrangements of spacers.

4A illustrates a case where four spacers 30 are arranged in a rectangular shape, and FIG. 4B illustrates a case where four spacers 30 are arranged in a rhombus shape. 4C illustrates a case in which four spacers 30 are arranged in a square shape, and FIG. 4D illustrates a case in which five spacers 30 are arranged in a pentagonal shape. 4E illustrates a case in which six spacers 30 are arranged in a hexagonal shape.

Table 1 below shows the maximum tensile stress of the vacuum glass panel 100 measured in the five configurations discussed above. The vacuum glass panel 100 used in the experiment was 300 mm long and 300 mm long, and the spacers 30 were disposed at intervals approaching the maximum allowable tensile stress of 8 MPa.

As shown in FIG. 5, the pentagonal pattern among the five arrangement forms in FIG. 1 shows that when a continuous pattern is formed, an empty space (see dotted line) is not included in the pattern, so that continuous pattern application is not possible. Can be. Therefore, the pentagonal form of the above five arrangement forms is undesirable.

The largest number of spacers 30 are arranged in the hexagonal shape, the same number of spacers 30 are arranged in the rectangular shape and the rhombus shape among the other four arrangement forms except the pentagonal pattern, and the smallest number of spacers in the square pattern It can be seen that 30 is disposed.

Therefore, in consideration of the foregoing, the spacer 30 may be disposed in a rectangular, rhombus, square, and hexagonal shape, among which the distance between the spacers 30 is the widest and the least number of spacers 30 are disposed. The square shape is optimal.

Next, the arrangement interval of the spacers 30 according to the thicknesses of the glass plates 10 and 20 when the plurality of spacers 30 are arranged in a square shape will be described.

Table 2 shows the optimum distance between the spacers 30 according to the thickness of the glass plate (10, 20). In this case, the thicknesses of the glass plates 10 and 20 represent the thickness of one glass plate, and the first glass plate 10 and the second glass plate 20 have the same thickness. The optimal distance between the spacers 30 is defined as the distance between the spacers 30 which realizes the tensile stress closest to the maximum allowable tensile stress of 8 MPa.

Based on the result of Table 2, the following equation can be derived.

Here, D is an arrangement interval (mm) of the spacer 30, and t represents the thickness (mm) of each of the glass plates 10 and 20.

When the condition of the above equation is satisfied, an excellent mechanical strength may be realized by increasing the tensile stress of the vacuum glass panel 100. Therefore, deformation such as warpage of the vacuum glass panel 100 is prevented, and the spacer 30 uniformly supports external pressure in the vacuum glass panel 100 to effectively prevent cracks and self-destruction of the glass plates 10 and 20. Can be.

Next, the manufacturing method of the above-mentioned vacuum glass panel 100 is demonstrated.

6 is a flow chart showing step by step the manufacturing process of the vacuum glass panel according to an embodiment of the present invention.

Referring to FIG. 6, the manufacturing method of the vacuum glass panel 100 includes a first step (S10) of preparing a spacer paste and screen printing and drying the paste on any one of the first and second glass plates. The second step (S20) to form a, the third step (S30) of laminating the first glass plate and the second glass plate with a spacer therebetween, and after sealing the edges of the first glass plate and the second glass plate to exhaust the internal space To form a vacuum space (S40).

First, in the first step (S10) of making a paste for spacers, the paste includes at least one of sodium silicate (water glass) and silica sol, alumina powder, silica powder, and ethylene glycol as a fluidizing agent. The paste may further comprise titanium dioxide powder.

The alumina powder functions to increase the compressive strength of the spacer and to improve the supporting force of the spacer. Ethylene glycol retards the curing of water glass, which is sensitive to external temperature changes, and plays a role in controlling the flowability of water glass.

Silica powder and titanium dioxide powder act as extenders to reduce the voids in the spacer and increase the amount of paste. In particular, since titanium dioxide powder has a smaller size than silica powder, it serves to increase the structural stability of the spacer.

The content of alumina powder in the paste is higher than that of silica powder, and the content of silica powder is higher than that of titanium dioxide powder. For example, the paste for the spacer may include 40 wt% to 50 wt% of the at least one compound selected from the group consisting of water glass and silica sol, 20 wt% to 30 wt% of the alumina powder, 15 wt% to 20 wt% of the silica powder, and ethylene glycol 5 wt% to 10 wt%.

Water glass and silica sol have the same physical properties as the first glass plate and the second glass plate, and because they themselves have adhesive properties, they function as adhesives. As the paste contains at least one of water glass and silica sol as the main component, the spacer can be directly adhered onto the glass plate in the subsequent screen printing process.

That is, since the use of a separate adhesive (for example, frit) for adhering the spacer to the glass plate can be omitted, the problem of deterioration of adhesion due to heterogeneity between the conventional frit and the glass plate and the frit and the spacer can be prevented.

When the content of the at least one compound selected from the group consisting of water glass and silica sol in the paste is less than 40% by weight, the adhesion performance of the spacer may be degraded, and the transmittance of the spacer and, moreover, the transmittance of the vacuum glass panel may be reduced due to the alumina particles. .

On the other hand, when the content of at least one compound selected from the group consisting of water glass and silica sol exceeds 50% by weight, the content of alumina powder, silica powder, and ethylene glycol is lowered, thereby reducing the compressive strength and thermal insulation performance of the spacer, and Difficulties in controlling fluidity can occur. In addition, since the pores are generated by expansion during the drying process, the compressive strength of the spacer may be lowered.

The paste may be prepared by mixing one or more compounds selected from the group consisting of water glass and silica sol, alumina powder, silica powder, titanium dioxide powder, and ethylene glycol and stirring them. In this case, the viscosity of the paste may be 2,000 cps to 20,000 cps.

If the viscosity of the paste is less than 2,000 cps, bleeding may occur in the screen printing process, and it may be difficult to maintain the shape of the printed spacer. If the viscosity of the paste exceeds 20,000 cps, the paste may stick to the screen mask, making screen printing itself difficult and rolling of the paste in front of the squeegee may not be performed smoothly.

Thus, the viscosity of the paste is an important factor in determining the print quality of the spacer. The viscosity of the paste can be controlled by adjusting the stirring speed and stirring time of the stirrer (not shown), and at least one of water glass and silica sol, additives (alumina powder, silica powder, titanium dioxide powder, and ethylene glycol) It can also control according to the mixing ratio.

Next, in the second step (S20), the above-mentioned paste is screen-printed on any one of the first glass plate and the second glass plate and dried to form a spacer. 7 is a schematic perspective view illustrating a screen printing process of a spacer.

Referring to FIG. 7, the first glass plate 10 is mounted on a horizontal base plate (not shown) of the printing apparatus. At this time, the first glass plate 10 may be vacuum-adsorbed to the horizontal base plate to force the movement. The first glass plate 10 may be replaced with a second glass plate.

The screen mask 70 is disposed on the first glass plate 10. As the screen mask 70, a metal mask may be used. In the screen mask 70, a plurality of pattern forming holes 71 corresponding to the preset number of spacers are formed. The size and shape of the spacer 30 is determined according to the size and shape of the pattern forming hole 71.

When the pattern forming hole 71 is circular, a cylindrical spacer 30 is formed. When the pattern forming hole 71 is a polygon such as square, rectangular, and hexagon, a polyhedral columnar spacer 30 is formed. do. The screen mask 70 may have a thickness of 50 μm to 1,000 μm. The thickness of the screen mask 70 determines the height of the spacer 30.

The screen mask 70 is mounted on a separate mounting jig (not shown) in order to prevent misalignment with the first glass plate 10, and then automatically moves according to the input coordinate value to the first glass plate 10. Can be disposed above.

Subsequently, a paste 72 is applied onto the screen mask 10. At this time, since the paste 72 is highly viscous, the squeegee 73 may be used to evenly apply the paste 72 to the entire upper surface of the screen mask 70. In this case, the pressure applied to the squeegee 73 should be lower than the pressure applied in the actual screen printing process, and the moving speed of the squeegee 73 should also be relatively faster than the speed performed in the actual printing process.

Since the spacer paste 72 may be easily solidified when exposed to air, the spacer paste 72 may be sealed and stored after manufacture. After the application, the spacer paste 72 may be rapidly screened to ensure excellent print quality.

Subsequently, the paste 72 is screen printed onto the first glass plate 10 using the squeegee 73. The squeegee 73 sweeps down the paste 72 along one direction, and the paste 72 is sequentially filled in the pattern forming hole 71 of the screen mask 70 by the squeegee 73. At this time, printing speed and printing pressure must be controlled for high quality printing. Printing speed and printing pressure can be standardized and applied in advance through sampling test.

Subsequently, the screen mask 70 is removed from the first glass plate 10, and the printed paste is dried to form a solid spacer 30. During drying, the fluidizing agent (ethylene glycol) component in the paste is evaporated. Drying may be carried out by rapid drying in a carbon dioxide atmosphere or by heat drying. The spacer 30 made through such a process is formed of a cylindrical or polyhedral column, and the arrangement form may be rectangular, rhombus, square, or hexagonal, of which the optimum may be called a square shape.

FIG. 8 is a schematic cross-sectional view showing a third step in the manufacturing process of the vacuum glass panel shown in FIG. 6. Referring to FIG. 8, in the third step S30, the first glass plate 10 and the second glass plate 20 are stacked with the spacer 30 interposed therebetween.

FIG. 9 is a schematic cross-sectional view showing a fourth step in the manufacturing process of the vacuum glass panel shown in FIG. 6.

Referring to FIG. 9, the edges of the first glass plate 10 and the second glass plate 20 are sealed in the fourth step S40 such that the edges of the two glass plates 10 and 20 abut. The torch 80 can be used in this process. Thereby, the space between the 1st glass plate 10 and the 2nd glass plate 20 can be sealed.

Subsequently, an exhaust device (not shown) is connected to an exhaust hole 51 formed in one of the first glass plate 10 and the second glass plate 20, for example, the second glass plate 20. Exhaust. Thereafter, the exhaust hole 51 is blocked by the cap member 52 to complete the vacuum glass panel 100.

The vacuum space 60 which functions as a heat insulation layer is formed inside the vacuum glass panel 100 which has undergone the above-described process, and the vacuum space 60 is secured and supported by the spacer 30 having excellent compressive strength and support force. . In this case, the thermal insulation function of the vacuum glass panel 100 may be improved not only by the vacuum space 60 but also by the spacer 30 including one or more particles and alumina particles selected from the group consisting of silica particles and titanium dioxide particles. have.

By the screen printing method described above, the production speed and production quality of the vacuum glass panel 100 can be improved, and the spacer 30 can be firmly fixed at a designated position without missing or misalignment of the spacer 30. In addition, the viscosity and printing speed control of the paste simplifies the printing process and minimizes printing defects, thereby saving material costs and manufacturing costs, and shortening the processing time.

10 is a graph showing a strain-stress curve of a spacer according to the present embodiment including alumina particles and silica particles, and FIG. 11 is a strain-stress of a spacer according to a comparative example including no alumina particles and silica particles. It is a graph showing a curve.

10 and 11, the maximum compressive strength of the spacer according to the present embodiment is about 33 MPa, and the maximum compressive strength of the spacer according to the comparative example is about 4.1 MPa, and the spacer according to the example is made of water glass only. It can be seen that the compression strength is approximately 8 times higher than that of the example spacer.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

100: vacuum glass panel 10: first glass plate
20: second glass plate 30: spacer
51: exhaust hole 52: cap member
60: vacuum space 70: screen mask
71: pattern forming hole 72: paste
73: squeegee 80: torch

Claims (17)

First glass plate;
A second glass plate which is edged to the first glass plate and disposed to face the first glass plate with a vacuum space therebetween; And
A plurality of spacers disposed between the first glass plate and the second glass plate to separate the first glass plate and the second glass plate from each other;
Including,
The plurality of spacers are formed of glass including alumina (Al ₂ O ₃ ) particles and silica (SiO ₂ ) particles, and are directly attached to one of the first and second glass plates by screen printing. Vacuum glass panels for insulation. The method of claim 1,
The vacuum glass panel for thermal insulation of the alumina (Al ₂ O ₃ ) particles is more than the content of the silica (SiO ₂ ) particles. The method of claim 1,
The plurality of spacers are insulated vacuum glass panel further comprises titanium dioxide (TiO ₂ ) particles. The method of claim 3,
The alumina (Al ₂ O ₃₎ content of the particles is greater than the content of the silica (SiO ₂₎ particles, wherein the silica (SiO ₂₎ content of the particles is the titanium dioxide (TiO ₂₎ vacuum for many insulation than the content of particles of glass panel. The method of claim 1,
The alumina (Al ₂ O ₃ ) particles are a vacuum glass panel for thermal insulation having a size of 1㎛ 10㎛. delete The method according to any one of claims 1 to 5,
The plurality of spacers are insulated vacuum glass panel formed in the shape of any one of a cylinder and a polyhedral pillar. The method of claim 7, wherein
The plurality of spacers is a vacuum glass panel for heat insulation having a height of 50㎛ to 1,000㎛. The method of claim 7, wherein
The plurality of spacers is a vacuum glass panel for thermal insulation having an average diameter of 100㎛ to 1,000㎛. The method of claim 7, wherein
The plurality of spacers are insulated vacuum glass panel is disposed in any one form selected from the group consisting of rectangular, rhombus, square, and hexagon. The method of claim 10,
The plurality of spacers are insulated vacuum glass panel disposed in a square shape. The method of claim 11,
The first glass plate and the second glass plate have the same thickness,
The said 1st glass plate, the said 2nd glass plate, and the said some spacer satisfy the following conditions.
D ≤ 7t + 6mm
Here, t is the thickness (mm) of the said 1st glass plate, and D represents the distance (mm) between the said some spacers. Preparing a spacer paste;
Forming a plurality of spacers by screen printing and drying the paste on one of the first glass plate and the second glass plate;
Stacking the first glass plate and the second glass plate with the plurality of spacers interposed therebetween; And
Sealing the edges of the first glass plate and the second glass plate and exhausting an internal space to form a vacuum space
Including;
The paste comprises at least one of water glass and silica sol, alumina (Al ₂ O ₃ ) powder, silica (SiO ₂ ) powder, and a fluidizing agent. delete The method of claim 13,
The paste further includes titanium dioxide (TiO ₂ ) powder,
The content of the alumina (Al ₂ O ₃₎ powder in the paste is greater than the content of the powder, the silica (SiO _2), the silica (SiO ₂₎ content of the powder is greater than the amount of powder wherein the titanium dioxide (TiO ₂₎ Method for producing a vacuum glass panel for thermal insulation. The method of claim 13,
The paste may include 40 wt% to 50 wt% of the at least one compound selected from the group consisting of the water glass and the silica sol, 20 wt% to 30 wt% of the alumina (Al ₂ O ₃ ) powder, and 15 wt% of the silica (SiO ₂ ) powder. % To 20% by weight, and 5% to 10% by weight of the fluidizing agent. The method according to any one of claims 13, 15, and 16,
The paste is a method of manufacturing a vacuum glass panel for thermal insulation having a viscosity of 2,000cps to 20,000cps.

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