KR20170114363A - High thermal insulation film for laminated glass and the glass using thereof - Google Patents

Abstract

The present invention relates to an adhesive film for a laminated glass comprising a polyvinyl butyral (PVB) resin, an ethylene vinyl acetate (EVA) resin, at least one resin selected from TPU (Thermoplastic Polyurethane) and hollow silica, and a laminated glass to provide. The adhesive film for laminated glass of the present invention exhibits physical properties such as durability, adhesive property, impact resistance, and heat insulation property and can be used to manufacture a laminated glass having infrared ray blocking, UV V blocking, and heat insulating function. Further, the laminated glass manufactured by applying the film of the present invention has a functionality that is excellent in durability, adherence, impact resistance, and heat insulation.

Description

TECHNICAL FIELD [0001] The present invention relates to a film for a bonded glass having excellent heat insulation and a glass laminated using the same. BACKGROUND OF THE INVENTION < RTI ID = 0.0 >

The present invention relates to a film for laminated glass excellent in heat insulation and a laminated glass using the same.

In recent years, as buildings have been densely packed and buildings adjacent to the noise source have increased, various efforts have been made to soundproof the buildings. One of them is the development and use of a double-layer glass having an air layer or a gas layer between glass layers . However, this double-layered glass has a large thickness of glass, and the foreign matter penetrates into the air layer or the gas layer, and the transmittance is highly likely to be damaged. Impact resistant glass includes tempered glass having increased hardness of the glass surface by heat treatment. However, the glass has a disadvantage in that it is not economical due to a high production cost due to energy loss due to heat treatment at the time of manufacturing, . Another type of impact resistant glass is a laminated glass comprising a film layer of polyvinyl butyral or the like between glass and glass at a high temperature and a high pressure. In general, a laminated glass is a laminated glass having transparency between two or more glass plates Refers to glass bonded by bonding a bonding film of polyvinyl butyral (PVB). The simplest structure of the laminated glass is a laminated adhesive film between two ordinary or tempered glass. Depending on the required performance, triple, quadruple, and multiple laminated glasses are also used. The laminated glass can be used to prevent the bullet from passing through, such as a veranda window of a high-rise apartment, a residential area such as a shower window glass, a glass used as a door, a building field such as skylights, There is a wide range of applications such as anti-theft glass for shops handling bulletproof glass or valuables, and glass for riot suppression such as prisons that require safety or security. In order to be used as an adhesive film or sheet for a laminated glass, it is required to satisfy conditions such as high adhesion to glass, transparency, stability against sunlight and ultraviolet rays, high tear strength and shock absorbing property. The energy consumed in the building sector is about 25% of the total energy consumption in Korea, and the energy loss through the windows is about 35% of the total energy consumption of the building. This is due to the fact that the heat conduction rate of the window is about 2 to 5 times higher than that of the wall or roof, which is the weakest part of the exterior of the building envelope.

In recent years, research and development are underway to develop a high thermal insulation window having a heat conduction ratio similar to that of a wall in terms of energy conservation in a building as well as energy conservation in the whole country. Furthermore, the insulation performance requirements for building envelopes, especially windows, are increasing due to the regulation of energy consumption and carbon dioxide emissions, so research on raw materials and manufacturing processes of the most excellent insulating glass in window glass, namely vacuum glass, ought.

In the patent document 10-2015-0131603, the heat-shielding UV binder composition for laminated glass comprises 15 to 40 parts by weight of a urethane methacrylate prepolymer, 30 to 60 parts by weight of a methacrylate monomer, 0.1 to 7 parts by weight of a silane coupling agent, About 0.1 to 10 parts by weight of a composite metal oxide and 0.1 to 7 parts by weight of a photoinitiator. Therefore, when the laminated heat-sensitive adhesive composition for a glass is applied to a window, infrared rays are blocked out of the sunlight and the transmittance of the visible light is maintained at a high level, thereby blocking infrared rays flowing into the building, Energy saving effect can be obtained.

It is an object of the present invention to provide a film for laminated glass which exhibits physical properties such as durability, adherence and impact resistance, and has infrared ray blocking, UV V blocking, and heat insulating function in the production of laminated glass.

It is another object of the present invention to provide a laminated glass excellent in durability, adhesive property, impact resistance, and heat insulating property by applying the above-mentioned filaments.

The present invention is an adhesive film for laminated glass comprising a PVA (polyvinyl butyral) resin, EVA (ethylene vinyl acetate) resin, at least one resin selected from TPU (Thermoplastic Polyurethane) and hollow silica.

The hollow silica particles in the film preferably have a diameter of 20 nm to 100 m. When particles having a diameter of 20 nm or less are used, the particle size is too small to provide a sufficient adiabatic effect. When the diameter exceeds 100 袖 m, the film can not be formed because the particles are too large and flow out without mixing with the resin. In addition, the hollow silica particles in the production of the film are preferably 1 to 20% by weight based on the total amount of the resin and the mixture. If the amount of the particles is less than 1% by weight, the effect of heat insulation is insignificant, and if it is more than 20% by weight, it is difficult to form a compound with a resin.

And the thermal conductivity of the film is 0.02 to 0.06 w / mK. The thermal conductivity is much lower than the thermal conductivity of a conventional adhesive film for laminated glass, which brings about the effect of adhering glass as well as insulating effect of glass. The heat-conduction ratio of the bonded glass and the double-layer glass produced using the film is 0.01 to 0.06 w / m ² K.

In addition, the film may further comprise an infrared absorbing material, or a UV blocking material, and may have additional functional effects with insulation.

The adhesive film for laminated glass of the present invention exhibits physical properties such as durability, adhesive property, impact resistance, and heat insulation property and can be used to manufacture a laminated glass having infrared ray blocking, UV V blocking, and heat insulating function.

Further, the laminated glass manufactured by applying the film of the present invention has a functionality that is excellent in durability, adherence, impact resistance, and heat insulation.

According to the present invention having the above-described structure, an adhesive film that performs functions such as heat insulation, ultraviolet ray blocking, infrared ray blocking, light reflection, and coloring on the surfaces of a plurality of glass members and a glass is bonded with the adhesive film to manufacture a functional bonded glass can do.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of a laminated glass having an insulating function according to the present invention,
2 is a cross-sectional view of a multi-layered glass using a laminated glass according to the present invention,
3 and 4 are photographs of an adhesive film for a laminated glass of the present invention,
Figure 5 is a photograph of compounds of PVB and hollow silica.
6 is a photograph of a compound of TPU and hollow silica.

The simplest structure of the laminated glass is a laminated adhesive film between two ordinary or tempered glass. Depending on the required performance, triple, quadruple, and multiple laminated glasses are also used. The laminated glass can be used to prevent the bullet from passing through, such as a veranda window of a high-rise apartment, a residential area such as a shower window glass, a glass used as a door, a building field such as skylights, A bulletproof glass, and an anti-theft glass such as a shop that handles valuables, and the like. In order to be used as an adhesive film or sheet for a laminated glass, it is required to satisfy conditions such as high adhesion to glass, transparency, stability against sunlight and ultraviolet rays, high tear strength and shock absorbing property.

Hereinafter, preferred embodiments of the present invention will be described in detail.

1. Production of Adhesive Film Having Thermal Insulation

1 is a cross-sectional view showing a bonded glass according to the present invention. The laminated glass 1 according to the present invention comprises a first glass 11 and a second glass 12 and a first glass 11 and a second glass 12 bonded to the first glass 11, And an adhesive layer 20 formed by melting an adhesive film therebetween.

The adhesive film constituting the adhesive layer 20 includes hollow silica powder for heat insulation. The hollow silica particles preferably have a diameter of 20 nm to 100 m. When particles having a diameter of 20 nm or less are used, the particle size is too small to provide a sufficient adiabatic effect. When the diameter exceeds 100 袖 m, the film can not be formed because the particles are too large and flow out without mixing with the resin. In addition, the hollow silica particles are preferably 1 to 20% by weight in the resin and the mixture as a whole when the film is prepared. When the particles are less than 1% by weight, the effect of heat insulation is insignificant and when the particles are more than 20% by weight, .

Polyvinyl butyral (PVB) is most commonly used in terms of physical properties, performance, or manufacturing. In addition, ethylene vinyl acetate (Ethylenevinyl) Acatate, EVA), and thermoplastic polyurethane (TPU).

The polyvinyl butyral (PVB) resin is produced by butylation of polyvinyl alcohol, and it is possible to adjust the degree of butylation when adhering to glass, thereby achieving a required adhesive strength level. However, since PVB resin is very tough and has high hardness, it is not easy to use when manufacturing laminated glass even though it is made into a plate, and when the laminated glass is bonded to glass, penetration resistance which prevents the impacted object from penetrating the glass, Is difficult to secure. For this purpose, it is necessary to add a plasticizer in an appropriate level to form a film with flexibility, and various additives will be added according to the application field, the required performance and the manufacturing method of the laminated glass. Accordingly, the thickness, And so on.

The adhesive film according to the present invention is prepared in the form of an adhesive film by mixing the hollow silica particles with a resin and then preparing it in a compound form and applying heat thereto. In addition, the adhesive film may further include functionalities such as ultraviolet blocking, infrared ray blocking, light reflection, and coloring in addition to the adiabatic function by further including an infrared ray and an ultraviolet ray blocking material.

The infrared blocking material (Antimony Tin Oxide) ATO, WO 3, MoO 3, and AZO (Aluminium Zinc Oxide) and ITO (Indium Tin Oxide) to be illustrative, and UV-blocking substance is _{TiO 2, SiO 2, Fe 2} O The same substance can be exemplified.

2. Laminated glass with insulation function

According to another aspect of the present invention, there is provided a method of manufacturing a bonded glass having an adiabatic function, comprising the steps of: preparing an adhesive film having a heat insulating function; Laminating the first glass on the upper surface of the glass, laminating the second glass on the adhesive film, and then heating and pressing the first glass and the second glass by thermal fusion. The adhesive film 13 includes, for example, a polyvinyl butyral (PVB) sheet and hollow silica particles, and the first glass and the second glass are tightly bonded through thermocompression, and a bonded glass is produced.

The bonded glass produced by the adhesive film has a thermal conductivity of 0.02 to 0.06 w / mK and a heat conduction rate of 0.01 to 0.06 w / m2K.

3. Manufacture of double-layered glass with insulating function

Also, the laminated glass produced according to the present invention can be used to manufacture a double-layered glass as shown in FIG. The double-layered glass (2) has an excellent heat insulating function by inserting an argon gas (30) between the bonded glasses by using the above-mentioned bonded glass (1). Especially, because of the adhesive layer used in the bonded glass, It has the advantage that it can show the effect.

4. Measurement of thermal conductivity

To measure the thermal conductivity, a center portion of an adhesive film having a length of 30 cm, a width of 30 cm and a thickness of 5 cm is cut out into a square having a length of 24 cm and a width of 24 cm to form a frame. An aluminum foil having a length of 30 cm and a width of 30 cm is adhered to one side of the frame to form a concave portion, and the sample is followed. Further, the surface covered with the aluminum foil is the bottom surface of the sample bed, and the other surface with respect to the thickness direction of the heat insulating sheet is the ceiling surface. The thermal insulation material in powder form is filled in the concave portion without being tapped or pressed, leveling is performed, and aluminum foil having a length of 30 cm and a width of 30 cm is placed on the ceiling surface. Using the sample to be measured, the thermal conductivity at 30 캜 is measured using a heat flow meter HFM 436 Lambda (trade name, manufactured by NETZSCH). Calibration was carried out in accordance with JIS A 1412-2 using a NIST SRM 1450c calibrating standard plate having a density of 163.12 kg / m 3 and a thickness of 25.32 mm under conditions of a temperature difference of 20 ° C on the high temperature side and 15 ° C, , 40, 50, 60, and 65 캜. The thermal conductivity at 800 ° C is measured in accordance with the method of JIS A 1421-1. Two heat-insulating sheets having a diameter of 30 cm and a thickness of 20 mm were used as measurement samples, and a thermal conductivity measuring apparatus (manufactured by Eiko Seiki Co., Ltd.) was used as a measuring apparatus. The thermal conductivity of the adhesive film of the present invention measured by the above method was measured to be 0.02 to 0.06 w / mK, and the thermal conductivity and the heat conduction rate of the remaining Examples and Comparative Examples are shown in Table 1.

5. Measurement of heat transfer rate

The rate of heat transfer is a measure of the heat flow rate by heat flow and is used to indicate the degree of heat transfer. That is, the amount of heat Q moving in a unit time through a unit area between two fluids in a steady state is proportional to the temperature difference (t1-t2) of the two fluids and Q = K (t1-t2) h < 0 > C. The proportional constant K (㎉ / ㎡h ° C) in this equation is also referred to as a heat conduction rate or a heat transfer rate.

In the present invention, a hot plate of 180 X 180 mm (width X length) is maintained at 100 ° C, and a laminated glass and a thermocouple are provided on the heat plate. After the bonded glass (300 mm × 500 mm, transverse X length) reached 100 ° C., the average temperature (Tglass) was calculated by measuring the temperature at one of the center and four outermost points of the bonded glass. Also, the ambient temperature (Troom) at the time when the temperature of the glass fell to 100 ° C was measured by the thermocouple, and the glass transition temperature (Uglass) of the glass was calculated by the following equation.

Uglass (占 폚) = 0.07874Tglass (占 폚) - 0.06307Troom (占 폚) - 0.046929

The heat-conduction ratio (Uglass, W / m ² K) of the bonded glass produced using the adhesive film of the present invention is 0.01 to 0.06, and the heat-conduction rate of the double-layered glass is 0.01 to 0.05, which is superior to general bonded glass and double- .

In the examples, an adhesive film was prepared as described above, a bonded glass and a double-layered glass were produced, and the thermal insulation effect was confirmed by measuring the thermal conductivity and the heat conduction ratio.

Example 1: An adhesive film was prepared by mixing 15 wt% of PVB resin and 100 nm hollow silica particles.

Example 2: An adhesive film was prepared by mixing 15 wt% of TPU resin and 100 nm hollow silica particles.

Example 3: A bonded glass was produced using the adhesive film according to Example 1 above.

Example 4; A bonded glass was produced using the adhesive film according to Example 2 above.

Example 5: A double-layered glass was produced using the adhesive film according to Example 3 above.

Example 6: A double-layered glass was produced using the adhesive film according to Example 3 above.

Comparative Example 1. The thermal conductivity of a PVB resin sheet as a material of a safety glass for automobiles and architectures was compared.

COMPARATIVE EXAMPLE 2 The thermal conductivity and the heat conduction rate of the bonded glass bonded using a general PVB sheet were measured.

Comparative Example 3. A double-layered glass was produced using the bonded glass of Comparative Example 2, and the thermal conductivity and the heat conduction rate were measured.

Thermal conductivity (w / mK) Thermal Permeability (W / m ² K) Example 1 0.025 - Example 2 0.029 - Example 3 0.018 1.2 Example 4 0.017 1.2 Example 5 0.01 0.9 Example 6 0.01 0.87 Comparative Example 1 0.1 - Comparative Example 2 0.08  1.78 Comparative Example 3 0.06 1.78

It can be seen from the above examples and comparative examples that the film for a contact glass of the present invention and the laminated glass and the laminated glass using the same exhibit a very excellent adiabatic effect as compared with a conventional adhesive film and a laminated glass.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, The present invention may be modified in various ways. Therefore, the present invention is not limited to the above embodiments.

One; A laminated glass 2; Multilayered glass
11, 12; Glass 20; Adhesive film
30; Argon gas

Claims (7)

An adhesive film for laminated glass comprising at least one resin selected from PVB (polyvinyl butyral) resin, EVA (ethylene vinyl acetate) resin, TPU (thermoplastic polyurethane) and hollow silica particles. The adhesive film according to claim 1, wherein the hollow silica particles have a diameter of 20 nm to 100 m. The adhesive film according to claim 1, wherein the hollow silica particles comprise 1 to 20% by weight. The method according to claim 1,
Wherein the thermal conductivity of the film is 0.02 to 0.06 w / mK. The method according to claim 1,
Wherein the film has a heat conduction ratio of 0.01 to 0.06 w / m ² K. The method according to claim 1,
An infrared absorbing material, or an ultraviolet blocking material. A laminated glass having an insulating function comprising the film of any one of claims 1 to 6.

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