KR20130013145A - Vacuum thermal insulator made of a formed glass wood material and its fabrication method - Google Patents

Abstract

PURPOSE: A vacuum thermal insulator made of a formed glass fiber material and a fabrication method for the same are provided to significantly shorten the time for compression-molding of a glass wool and improving insulation performance as contrasted with the existing vacuum insulation panels which use the powder of organic and inorganic materials as heartwood. CONSTITUTION: A fabrication method for a vacuum thermal insulator using a glass wool with C-glass composition is as follows. A glass wool blanket with C-glass in which a fine powder of a plate glass is distributed is compressed by heat and molded to have a density of between 0.1 and 0.7 g/cm2 and subsequently use the result as heartwood for the vacuum thermal insulator. A container which surrounds the heartwood is breathable to endure high vibration and has a vacuum level of between 10-1 and 10-6 torr. [Reference numerals] (AA) Viscosity(Log M, poises); (BB) Plate glass; (CC) Temperature(°C)

Description

Vacuum Thermal Insulator Made of a Formed Glass Wood Material and its Fabrication Method}

The present invention relates to a vacuum insulation material using a glass bag cotton molded body as an insulating core material and a method for manufacturing the same, and to spread the fine powder obtained by crushing the plate glass in a glass wool blanket of a so-called C-glass composition, and C-glass 0.1 to 0.5 gr / cm ³ density by heating and pressing at a pressure of 0.007 to 1.5 kg / cm ² for at least 7 minutes in the temperature range corresponding to the annealing point (μ = 10 ¹³ poises) It is molded so as to put the molded glass bag cotton in a breathable airtight container by vacuum evacuation to 10 ^-5 to 10 ^-6 torr to provide a method for producing a vacuum insulating material using the glass bag cotton produced.

In general, the vacuum insulation material can express 10 times or more of heat insulation compared to the conventional heat insulating material made of organic foam such as polyurethane and polystyrofoam, so that a so-called zero-house (green house) project or energy-saving refrigeration requiring high heat insulation is required. It is getting the spotlight as the core material of freezer production and electric equipment.

Since this vacuum insulation system keeps the interior in a high vacuum state, it minimizes heat transfer by gaseous medium such as air. Therefore, a certain type of vacuum vessel such as a panel type has a great pressure from the outside to the inner core by atmospheric pressure. do.

Therefore, the core material must have sufficient strength to withstand it, have high insulation performance, light weight, and have good ventilation to facilitate the exhaust operation. In addition, the heat insulating core should not be decomposed in a vacuum to generate gas. Therefore, the performance and quality of such insulation core material determines the performance of the vacuum insulation panel which is the final product.

Core materials used in the vacuum insulation system is a polyurethane and polystyrofoam foam using a micro-opening cell structure as an inorganic material and an organic material such as silica powder, glass fiber, calcium silicate-based molded body.

U.S. Patent Nos. 4195395, 4425413, 4636415, 4681788, Japanese Patent Publication Nos. 1-44668, 1-33853, and Japanese Patent Publication No. 7-814881 are core materials molded from silica powder as a main raw material, and Korean Patent No. 0359738 is calcium silicate core material. .

On the other hand, the polyurethane foam is US Patent No. 4668555, the polystyrofoam foam is Korean Patent Application No. 95-48619 and Korean Patent Publication No. 1999-010954.

The vacuum insulation material based on the silica powder, calcium silicate, and foamed organic material as described above has a lack of breathability for exhaust workability, dust generation, long-term vacuum decrease due to gas and water vapor in vacuum, and gas adsorbent for preventing the same. There are disadvantages, and above all, the thermal conductivity did not reach much in the case of glass fiber core material about 0.006 to 0.008 kcal / mh ℃.

In the case of using a glass fiber as a core material, there are US Patent Nos. 4537820, 5090981, 5094899, 5330816 and Korean Patent No. 10-0359056. The vacuum insulator using these glass fiber cores was excellent in evacuation workability and thermal conductivity was 0.002 to 0.003 kcal / mh ° C., and the thermal insulation performance was superior to any kind of organic and inorganic cores.

However, the four U.S. patents use organic and inorganic binders to form glass fibers, which does not completely rule out the possibility of gas release in vacuum and inevitably employ expensive gas getters to prevent them. It had a downside.

On the other hand, the Republic of Korea Patent No. 10-3595056 is a method of forming a high thermal insulation and breathable core material because it presses the glass bag near the strain point (μ = 10 ^14.5 poises), but the viscosity is too high, that is too low Since it adopts the heating temperature, it takes about 30 minutes or longer to form the equilibrium density even when pressurized under high load, so that the inferiority of productivity for mass production such as delay of production speed and high energy consumption is inevitable.

The present invention can express the same excellent heat insulating performance as the vacuum insulator according to the prior patent which uses the glass fiber molded body such as the Korean Patent No. 10-0359056 as the heat insulating core material, and can significantly shorten the production time than the prior art and also provides a gas adsorbent ( It was a technical task to manufacture a new glass bag cotton vacuum insulation material with very high productivity since there is no need to employ a gas getter.

In the present invention, the individual fibers of the C-glass bag cotton 10 ¹³ poises, that is, the annealing point of the minimum viscosity that can be thermally fused relatively easily when heated under pressure at the contact point of the glass fibers without losing the intrinsic sensitivity of the glass The glass bag was formed by heating and pressing at a temperature of 570 to 610 ° C. before and after a relatively short time (7 to 10 minutes). Furthermore, in the temperature range, a viscosity lower than that of the C-glass composition may be exhibited as a means for further promoting thermal fusion molding without lowering the heat resistance of the glass bag molding, that is, reforming viscosity (10 ⁹ to 10 ¹⁰ poises). By spreading evenly the glass powder (window glass) powder on the glass bag cotton body plate glass powder was able to trap the c-glass fibers and fibers in the trapezoidal body all over the trapezoidal (inter-necking). Plate glass powder used as a kind of thermal bonding agent does not decompose even when cooled or heated at high vacuum, and does not generate gas, so that a separate gas adsorbent does not need to be infiltrated into the vacuum container.

The present invention can produce a glass fiber molded body in a faster time than any prior art without using a joint capable of generating gas in a vacuum by such means, thereby producing a vacuum insulation material that guarantees the highest thermal insulation performance and productivity can do.

Since the vacuum insulation panel is manufactured using the glass bag insulating molded body according to the present invention and a manufacturing process thereof, the thermal insulation of the vacuum insulation panel based on the existing organic material and inorganic material powder can be far exceeded. Compared to the conventional vacuum insulation panel manufacturing method based on glass fibers such as -3595056, the hot press molding time of the glass fiber backing can be greatly shortened, which has an excellent effect of greatly improving productivity.

Figure 1. Viscosity change according to the temperature of the glass bag.
Fig. 2. Structure virtual diagram of the glass bag insulating molded body.
3. Overall manufacturing flow chart.
Figure 4. Glass bag cotton insulation molded product manufacturing process (1: the pressing plate of the press, 2: heating element,
3a: laminated glass bag, 3b: glass bag molded body, 4: press-pressed plate of press).
Fig. 5. Vacuum insulation panel configuration diagram (3b: glass bag molded body, 5, 6: shell, 7: exhaust port).
6. Thickness change according to the pressurization temperature.
Figure 7 changes in thickness with time.

Hereinafter, the glass bag molding according to the present invention will be described in more detail through the manufacturing method of the vacuum insulation material using the insulation core material as follows.

The core material of the vacuum insulation material of the present invention is a glass bag cotton molded body, and this glass bag cotton is a building insulation thermal insulation material C-glass is a composition (wt%) as shown in Table 1, the fiber diameter is laminated in a glass wool state of 8 to 12 ㎛ It is a blanket.

ingredient
Kinds SiO ₂ Na ₂ O CaO MgO Al ₂ O ₃ Fe ₂ O ₃ B ₂ O ₃ Glass 70-73 13-15 7-12 1 to 4.5 1.0 to 1.8 0.08 ~ 0.14 0 C-glass 65-66 8 ~ 9 12-14 3 to 4 3 to 4 0 4 to 6

The limit condition when heating and pressurizing this glass bag laminate should be such that the glass fiber individual does not deform or deteriorate due to crystallization or the like under heating load. In addition, the rigidity inherent in the glass fiber should not be lost.

Therefore, the temperature of the glass should be less than the softening point (μ = 10 ^7.65 poises) and the area above the strain point (μ = 10 ^14.5 poises), which is the lower limit at which glass ions start to have thermodynamic activity.

At temperatures above the softening point, the traits, form and stiffness of the glass can be significantly impaired.At the temperature below the strain point, no matter how much load is applied, sufficient viscosity drop and glass fiber can be achieved at the contact point of the glass fiber with the fiber. The thermodynamic activity of the ions constituting

In the case of Korean Patent No. 10-0359056, the glass bag was heated and pressed in the temperature range below the strain point, and according to the above principle, a long time of 30 minutes or more is required to obtain a molded body having a desired equilibrium density even if it is pressed under a high load. The productivity required for mass production was inferior.

In the present invention, in order to improve this, a glass plate that can express a slightly lower viscosity at the same temperature than the C-glass bag composition, that is, soften more quickly, is selected from ordinary flat glass (see Table 1). After spreading the pullet of the plate glass cullet powder into the bag body, the C-glass bag laminate in which the plate glass powder was dispersed was subjected to an annealing point (μ = 10 ¹³ poises) of C-glass composition. At the same time, it is pressurized at a temperature of 570 to 610 ℃ corresponding to the reheat molding section of the glass composition (μ = 10 ⁹ to 10 ¹⁰ poises, see Figure 1) so that the scattered plate glass powder is easily between the fibers of the C-glass bag cotton Since it is fused, it is possible to manufacture a glass bag molding in a short time.

In addition, even if the plate glass powder is not dispersed and only the C-glass fiber and the fiber are in contact with each other, the C-glass fiber itself is heated to the slow cooling point, so that the thermodynamics of the sufficient viscosity and the glass component for the liquid phase sintering under the load are applied. Because of its activity, adhesion can be easily achieved at these parts.

That is, in the case of Patent No. 10-0359056, it can be obtained by hot press for 30 minutes or more, but according to the principle as described above, as shown in FIG. The glass bag cotton compact of 0.5 g / cm <3> (equilibrium density) was sufficient if it heated and pressed about 10 minutes. In addition, the cotton wool molded body produced by the method of the present invention has the inherent rigidity and trait of C-glass fibers.

The plate glass powder employed in the present invention can be obtained inexpensively and has a high melting point compared to the expensive low-melting glass of PbO-ZnO-B ₂ O ₃ -SiO ₂ system, which was used as an inorganic adhesive in a conventional foreign patent. Along with the sheath of stainless steel sheet, it also has the advantage of having heat resistance that can be used as a heat shield material such as a firewall.

In the present invention, the glass bag cotton insulation molded product prepared as described above is inserted into a vacuum container (shell) made of stainless ultrathin plate having a thickness of 40 to 100 μm, and all the contact surfaces except the exhaust pipe are hermetically welded and 10 ^-4 to 10 A vacuum insulation panel having the configuration as shown in FIG. 5 was fabricated by evacuating the gas at a high vacuum of ⁻⁶ torr and then sealing the exhaust pipe.

A feature of the present invention is a costly gas adsorbent separately because it not only expresses extremely low thermal conductivity of 0.002 to 0.003 kcal / mh ° C., but also does not use any organic and inorganic binders capable of generating gas under high vacuum for shaping glass bags. It is possible to maintain high vacuum in the long term without the need to employ

Moreover, the container itself is corrosion resistant, stainless steel to withstand high vacuum, and fully welded to ensure long life and recycling. In addition to the material of the container as well as the insulation core itself has a high heat resistance there is an advantage that can be used at high temperatures. In addition, the present invention has very high productivity because the time for heating and pressing the glass bag is shorter than that of any conventional manufacturing method.

Next, a vacuum insulating material manufacturing method using the glass bag cotton according to the present invention will be described in detail with reference to the accompanying drawings.

3 is an overall manufacturing process. The glass backing blanket is cut to the desired size (standard 30x30 cm), and then the glass powder ground to about 400 mesh is dispersed in the glass backing body, and then subjected to a pressure of 0.007 to 1.5 kg / cm ² at 570 to 610 ° C. Pressurize for about 7 to 10 minutes until the thickness reaches equilibrium at the temperature (standard 2 cm) to make a glass wool insulation molding having a volume and density of 0.1 to 0.5 g / cm ³ , standard size 30x30x2 cm It is inserted into a breathable panel container made of stainless ultrathin plate of 40 to 100 µm in thickness and welded to all edges except the exhaust pipe. Exhaust vacuum was exhausted through the exhaust pipe until it became a vacuum of 10 ^-4 to 10 ^-6 torr, and then the airtight sealing of the exhaust pipe was instantaneously completed to form a standard 30x30x2 cm stainless steel jacketed vacuum insulation panel.

Figure 4 illustrates the process of making the heat insulation core material by heating and pressing the glass bag. First, heat is applied to the heating element 2 of the upper press plate 1 and the lower press plate 4 of the press to maintain the temperature at 570 to 610 ° C., which is a slow cooling point temperature section of the C-glass bag.

Then, a glass bag of uniform size scattered with plate glass powder is laminated on the lower pressing plate 4 (Fig. 4-a). The laminated glass bag 3a is gradually pressed while raising the lower pressure plate 4 (Fig. 4-b). At this time, the pressurization temperature, the pressurization time, and the molding pressure become important factors, which will be described later.

When the molding is completed, the lower pressing plate 4 is lowered and the glass bag molding 3b is taken out from the press and cooled (Fig. 4-c).

Then, the glass bag molding 3b is placed in a breathable container made of stainless ultrathin plates 5 and 6, as shown in FIG. 5, and evacuated under reduced pressure.

The breathable container is made of a stainless steel ultrathin plate having a thickness of 40 to 100㎛. Through this decompression process, the internal structure of the organic cotton ball molded body 3b is changed into a structure in which the thermal insulation performance can be further improved. The rim may be cut or processed to the desired size prior to placing the glass bag molded body in a breathable container.

In the vacuum exhaust process, as shown in FIG. 5, a small pipe 7 is connected to one axis of the breathable container, and exhausted through the pipe 7 to vacuum the glass bag molded body 3b in the vacuum container of the breathable container. The pipe 7 is then sealed by pressing. The vacuum exhaust is preferably such that the vacuum degree of the breathable container is maintained in the range of 10 ^-4 to 10 ^-6 torr.

Pressing temperature and pressurization time during the glass bag forming step were investigated by varying the pressurizing temperature and pressurizing time under constant pressure to set the optimum range.

Figure 6 shows the change in thickness while maintaining the glass bag molding when laminating the glass bag cotton and pressurized at 0.01 kg / cm ² pressure for 10 minutes. As can be seen here, even when a constant pressure is applied, the thickness for holding the molded body is not reached unless the proper temperature is reached. In this case, it is impossible to use the core material of the vacuum insulation material.

The temperature at which the thickness can be maintained as a molded body was about 570 ° C or lower, which is about 20 ° C lower than 590 ° C, which is a temperature corresponding to the slow cooling point of C-glass, which is a glass bag. However, the range of 570 ~ 610 ℃ was most suitable in consideration of deformation or alteration of the glass bag.

Figure 7 shows the time change that can maintain the thickness of the molded body when pressing the laminated glass bag at a pressure of 0.01 kg / ㎠ at 590 ℃. In less than 7 minutes, the thickness of the molded article was not formed. In this case, the molded article swells again, which makes it difficult to treat the core material of the vacuum insulator. Therefore, it can be seen that the pressing time for molding should be at least 7 minutes or more.

From these results, in the present invention, suitable molding conditions for maintaining the glass bag molding body are 0.007 to 1.5 kg / cm ² at a temperature range of 570 to 610 ° C., which is near the slow cooling point of the glass bag composition glass and is a reforming temperature section of the scattered plate glass powder. The pressure was maintained for at least 7 minutes.

Hereinafter, the present invention will be described in detail with reference to the following examples, but the scope of the present invention is not limited by the following examples, and the present invention may be modified and modified in various ways.

Example 1:

Plate glass fine powder (about 400 mesh) of the composition as shown in Table 1 was also cut into the cut glass bag body after cutting the so-called C-glass composition as illustrated in Table 1 to 30x30 cm in size. Was spread evenly. After laminating it on the lower press plate of the hot press, the temperature of the upper press plate and the lower press plate of the hot press is maintained at 590 ° C. corresponding to the slow cooling point of the C-glass bag and the reheating molding point of the scattered fine plate glass powder. It was held for 10 minutes while being pressed to a thickness of about 2 cm at a pressure of about 0.01 kg / cm ² . The lower pressure plate was lowered, and the glass batting insulation core was inserted into a container made of stainless ultrathin plate having a thickness of 80 μm, and vacuum exhausted to 5.6 × 10 ^-5 torr through a male exhaust pipe welded to all the edges of the container except the exhaust port. After exhaust, the exhaust pipe was pressurized and pressurized instantly to prepare a vacuum insulation panel having a size of 30 × 30 × 2 cm. The measured thermal conductivity of this vacuum insulated panel was 0.0023 kcal / mh ° C at 20 ° C on average.

Example 2:

In Example 1, the pressing force during molding of the glass bag was 0.05 kg / cm ² , and a vacuum insulation panel was manufactured in the same manner.

Example 3:

In Example 1, the pressing force during molding of the glass bag was 0.08 kg / cm ² and the vacuum insulation panel was manufactured in the same manner.

Example 4:

As in Example 1, a glass bag molded core material made by the same method was inserted into a container made of aluminum foil coated with a vacuum-resistant special polyurethane film, and then all the edges except the exhaust pipe roll were heat-sealed and 5.6 × 10 ⁻ After vacuum evacuation to ⁵ torr, an exhaust pipe roll was hermetically welded to prepare a vacuum insulation panel having a size of 30 × 30 × 2 cm.

The thermal conductivity of the glass bag cotton vacuum insulator prepared in Examples 1 to 4 is shown in Table 2.

Example Container material Glass bag
Molding conditions Vacuum degree
(torr) Thermal conductivity
(kcal / mh) One Stainless 0.01 kg / cm ² ,
590 ° C, 10 minutes 5.6 × 10 ^-5 0.0024 2 Stainless 0.05 kg / cm ² ,
590 ° C, 10 minutes 5.6 × 10 ^-5 0.0022 3 Stainless 0.08 kg / cm ² ,
590 ° C, 10 minutes 5.6 × 10 ^-5 0.0023 4 Polyurethane
Coated
Aluminum foil 0.01 kg / cm ² ,
590 ° C, 10 minutes 5.6 × 10 ^-4 0.0031

Claims (11)

C-glass glass wool laminates with finely dispersed flat glass powder are hot-pressed and formed with a glass back wool insulator with a density of 0.1 to 0.7 g / cm ² as a core material, and are breathable and resistant to high vacuum surrounding the core material. A vacuum insulation material manufacturing method using a glass bag cotton of C-glass composition, characterized in that the vacuum degree is 10 ^-1 to 10 ^-6 torr. The glass bags of C-glass composition, which do not contain any organic and inorganic binders except that the fine glass powder is dispersed, are laminated in a certain shape, and the laminated glass bags are annealing point of glass of C-glass composition. , μ = 10 ¹³ poises) 590 ℃ up and down 20 ℃, that is, the pressure of 0.007 to 1.5 kg / cm ² or more in the temperature range of 570 to 610 ℃ 7 minutes or more can be formed to withstand high vacuum vacuum Method of manufacturing a vacuum insulation material using a glass bag comprising the step of putting in a breathable container and evacuating the vacuum. The method according to claim 1 and 3,
Glass bag cotton is not limited to the C-glass composition, it is also possible to adopt a glass bag cotton having a similar composition. However, the glass powder of the composition which expresses the hot viscosity change of glass faster than the glass bag cotton employ | adopted that is slightly lower than glass bag cotton at the same temperature is adopted together. In this case, too, the heating is performed at a temperature range of ± 20 ° C. of the temperature corresponding to the slow cooling point (μ = 10 ¹³ poises) of the glass bag, so that the viscosity of the glass powder dispersed in the glass bag body is reheated. Phosphorus molding is carried out by pressing at a pressure of 0.007 to 1.5 kg / cm ² in a softened to 10 ⁹ to 10 ¹⁰ poises section to make a glass bag molded body, the method of manufacturing a vacuum insulation material as a core material. The method according to claim 2 and 3,
Method for producing a vacuum insulation material using a glass bag cotton, characterized in that the material of the breathable container capable of withstanding high vacuum is made of stainless ultra-thin plate having a thickness of 120 ㎛ or less. The method according to claim 1 and 3,
A method of manufacturing a vacuum insulation material using a glass bag cotton, characterized in that the material of the breathable container is made of aluminum foil coated with a polyurethane film that can withstand high vacuum. The method of claim 2,
One side of the breathable container is a vacuum insulating material manufacturing method using a glass bag, characterized in that the pipe is provided for vacuum exhaust. The method according to claim 6,
After vacuum evacuating from the glass bag molded body inside the breathable container, the method of manufacturing a vacuum insulation material using a glass bag cotton further comprising the step of sealing by pressing or heat-sealing the pipe. The method of claim 1,
Vacuum evacuating the glass bag cotton in the breathable container to prepare a vacuum insulation material using a glass bag cotton, characterized in that the vacuum degree is 10 ^-1 to 10 ^-6 torr. The method according to claim 4 and 5,
The vacuum insulator is manufactured in various shapes and sizes including a panel type, a box type, a cylindrical type, a semi-cylindrical type, a pipe type, a half pipe type, and a curved panel. The vacuum insulating material prefabricated panel and its fabrication are manufactured in a certain size by arranging the vacuum insulation units made in claim 4 or 5 in a mold of a metal plate or a plastic material and bonding and fixing them with an organic foam such as polyurethane or polystyrofoam. Way. A high heat-resistant and high fire-resistant vacuum insulation prefabricated panel and a method of manufacturing the same, wherein the vacuum insulation units manufactured according to claim 4 are arranged in a mold of a metal sheet or a plastic, and bonded and fixed by gypsum and cement foam.

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