Composite hollow heat-insulating glass and preparation method thereof

Abstract

The invention relates to the technical field of glass, in particular to composite hollow heat-insulating glass and a preparation method thereof.According to the preparation method, specific cooling parameters are adopted, so that a nano PVB film is stably hot-melted between first glass and second glass, nano factors are not lost, and the heat-insulating performance of the glass is improved; therefore, the heat transfer coefficient and the ultraviolet transmittance of the hollow heat insulation glass are obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of glass technology, and more specifically, to a composite insulated glass and its preparation method. Background Technology

[0002] Insulated glass units are widely used in building decoration, renovation and other fields, and due to their good thermal insulation, sound insulation and safety, they have become an indispensable material for modern buildings.

[0003] Existing insulated glass typically consists of two panes of glass and a spacer frame. The spacer frame is located between the two panes of glass and is adhered and fixed to the two panes of glass with sealant, thus forming a hollow cavity between the two panes of glass.

[0004] Patent CN114920470A discloses a type of insulated glass with the aforementioned structure. It utilizes thermoplastic polyurethane as a sealant coated on the outer wall of the spacer frame to improve the seal between the spacer frame and the two panes of glass, extending the residence time of gas within the hollow cavity and thus prolonging the lifespan of the insulated glass. However, this improvement does not enhance the heat insulation performance of the insulated glass; the resulting insulated glass shows no significant difference in heat insulation performance compared to conventional insulated glass, with a heat transfer coefficient typically between 2.6 and 2.8 W / (m²). 2 *k), the ultraviolet transmittance is generally 50%-70%.

[0005] Therefore, a solution that can significantly reduce the heat transfer coefficient and ultraviolet transmittance of insulated glass is in line with market expectations. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a composite insulated glass and its preparation method, which can significantly reduce the heat transfer coefficient and ultraviolet transmittance of insulated glass.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0008] A method for preparing composite insulated glass includes the following steps:

[0009] S1: The nano PVB film is held between the first glass and the second glass and placed in a heating device to thermally bond the nano PVB film to the first glass and the second glass to obtain laminated glass.

[0010] S2: Adhere the bottom surface of the spacer frame to the top surface of the laminated glass with the first sealant, so that the second glass is located inside the spacer frame;

[0011] S3: The third glass is adhered to the top surface of the spacer frame with the first sealant, so that a hollow cavity is formed between the third glass and the second glass;

[0012] S4: A second sealant is applied to the outside of the spacer frame to produce a composite insulated glass.

[0013] Preferably, in step S1, the cooling curve of the heating device is from 118℃-119℃ to room temperature, and the cooling time is not less than 2.5 hours.

[0014] Preferably, the spacer frame is formed by fastening a stainless steel outer frame and a plastic inner frame, and the interior of the spacer frame is filled with 3A molecular sieve.

[0015] Preferably, a plurality of water vapor holes are provided on the inner plastic frame.

[0016] Preferably, the first glass is clear glass, and the third glass is coated glass.

[0017] Preferably, the first sealant is a butyl sealant.

[0018] Preferably, the hollow cavity in step S3 is filled with an inert gas.

[0019] Preferably, the thickness of the first glass, the second glass, and the third glass is 5.8-6.2 mm.

[0020] Preferably, the thickness of the spacer frame is 10-12 mm.

[0021] A composite insulated glass is prepared according to the above-described preparation method.

[0022] In summary, the present invention has the following beneficial effects: the nano PVB film is fixed between the first glass and the second glass through a process of heating first and then cooling, which plays the role of heat insulation and blocking ultraviolet rays, thereby significantly reducing the heat transfer coefficient and ultraviolet transmittance of the insulating glass. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the composite hollow heat-insulating glass in this invention;

[0024] Figure 2 This is a top view of the composite insulated glass in this invention;

[0025] Figure 3 yes Figure 2 Cross-sectional view at point AA;

[0026] Figure 4 yes Figure 3 Enlarged view of region B in the middle;

[0027] Figure 5 This is a partial structural diagram of the spacer frame in this invention;

[0028] Figure 6 This is a temperature curve diagram inside the heating device of the present invention.

[0029] The components are: 1. First glass; 2. Second glass; 3. Nano PVB film; 4. First sealant; 5. Spacer frame; 51. Plastic inner frame; 511. Water vapor pores; 52. Stainless steel outer frame; 53. 3A molecular sieve; 6. Third glass; 7. Second sealant; 8. Hollow cavity. Detailed Implementation

[0030] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] In this invention, the nano-PVB film 3 was purchased from Foshan Mingshida Intelligent Materials Co., Ltd., and its size is 28.5*28.5 square centimeters; the thickness of the first glass 1, the second glass 2, and the third glass 6 is 6±0.2 mm; the first glass 1 is clear glass, used for indoor installation, and its size is 30*30 square centimeters; the third glass 6 is coated glass, used for outdoor installation, and its size is 30*30 square centimeters. The second glass 2 is ordinary glass, and its size is 20*28 square centimeters; the thickness of the spacer frame 5 is 10-12 mm. The first sealant 4 is butyl sealant, and the second sealant 7 is thermoplastic polyurethane sealant.

[0034] Example 1

[0035] A method for preparing composite insulated glass, such as... Figure 1-6 As shown, it includes the following steps:

[0036] S1: The nano-PVB film 3 is sandwiched between the first glass 1 and the second glass 2, and then placed flat in a heating device to allow the nano-PVB film 3 to thermally bond to the first glass 1 and the second glass 3, thus producing laminated glass; the temperature curve inside the heating device is as follows. Figure 6 As shown;

[0037] S2: The bottom surface of the spacer frame 5 is adhered to the top surface of the laminated glass (first glass 1 or nano PVB film 3) with the first sealant 4, so that the second glass 2 is located inside the spacer frame 5.

[0038] S3: The third glass 6 is adhered to the top surface of the spacer frame 5 with the first sealant 4, so that a hollow cavity 8 is formed between the third glass 6 and the second glass 2.

[0039] S4: Apply a second sealant 7 to the outside of the spacer frame 5 to ensure that the contact corners between the spacer frame 5 and the first glass 1 and the contact corners between the spacer frame 5 and the third glass 6 are sealed by the second sealant 7, thereby obtaining a composite insulated glass.

[0040] The nano PVB film 3 is fixed between the first glass 1 and the second glass 2 through a process of heating and then cooling, which plays the role of heat insulation and blocking ultraviolet rays, thereby significantly reducing the heat transfer coefficient and ultraviolet transmittance of the insulating glass.

[0041] In a preferred embodiment, in the final cooling stage of step S1, the cooling time of the heating device from 118℃-119℃ to room temperature is not less than 2.5 hours (as shown in Table 1 below, the cooling starts at 270 minutes and the time from 118.9℃ to 27.0℃ is not less than 150 minutes). Figure 6 The corresponding times for each temperature are shown in Table 1 below:

[0042] Table 1 Temperature data inside the heating equipment

[0043] Time / min 0 60 150 220 270 420 Temperature / °C 22.7 208.4 85.1 101.4 118.9 27.0

[0044] During the research and development, the inventors discovered that parameter control during the cooling stage is crucial to the quality of bonding the first glass 1 and the second glass 2 with the nano PVB film 3. Ensuring that the temperature is reduced from 118℃-119℃ to room temperature for no less than 2.5 hours allows the first glass 1 and the second glass 2 to be bonded more firmly by the nano PVB film 3. The adhesive layer formed by the nano PVB film 3 is more uniform and flat, which can improve the service life of the nano PVB film 3 and the transmittance of the glass. As for the specific mechanism, the inventors need to conduct further research.

[0045] In a preferred embodiment, the spacer frame 5 is formed by fastening together a stainless steel outer frame 52 and a plastic inner frame 51, and the interior of the spacer frame 5 is filled with 3A molecular sieve 53.

[0046] In summer or during the day when temperatures rise, the gas inside the hollow cavity expands due to heat, exerting an outward pushing force on the first glass 1 and the third glass 6, causing bulges. Conversely, in winter or at night when temperatures drop, the gas inside the hollow cavity contracts due to the cold, exerting an inward suction force on the first glass 1 and the third glass 6, causing depressions. Deformation of the surfaces of the first glass 1 and the third glass 6 not only affects their appearance but also causes cracks in the surrounding sealing areas, creating gaps that easily leak air and allow external moisture to enter the hollow cavity through these gaps.

[0047] The inventors discovered that improving the conventional spacer frame 5 (usually a square stainless steel tube) can effectively prevent cracking of its surrounding sealed parts, avoiding gaps and air leakage. The spacer frame 5 is configured as a stainless steel outer frame 52 and a plastic inner frame 51. The stainless steel outer frame 52 has a "C"-shaped cross-section, which, compared to the conventional "U"-shaped structure, has better ductility (deformability). This effectively prevents cracking of the sealed parts around the spacer frame 5 when the first glass 1 or the third glass 6 bulges outward or recedes inward. Furthermore, the plastic inner frame 51 has a "π"-shaped cross-section, forming the spacer frame 53 within the stainless steel outer frame 52. The plastic inner frame 51 prevents fogging within the hollow cavity 8 because, compared to stainless steel, water vapor is less likely to form droplets on the surface of the plastic material.

[0048] In a preferred embodiment, a plurality of water vapor holes 511 are provided on the plastic inner frame 51.

[0049] Through several water vapor pores 511, water vapor in the hollow cavity 8 can be absorbed by the 3A molecular sieve 53, reducing the proportion of water vapor in the hollow cavity 8 entering the interior of the nano PVB membrane 3 through the molecular gaps of the second glass 2 or the gap between the second glass 2 and the plastic inner frame 51, thus reducing the risk of the nano PVB membrane 3 coming into contact with water vapor and extending the service life of the nano PVB membrane 3.

[0050] In a preferred embodiment, the hollow cavity 8 in step S3 is filled with an inert gas (nitrogen or argon). Compared with air, the thermal stability of the inert gas is less affected by temperature, which improves the stability of the gas pressure in the hollow cavity 8, reduces the deformation of the first glass 1 or the third glass 6, making it less prone to breakage, or improves the sealing performance of the first sealant 4 between the first glass 1 and the spacer frame 5, or improves the sealing performance of the first sealant 4 between the third glass 6 and the spacer frame 5.

[0051] Comparative Example 1

[0052] Compared with Example 1, step S1 is omitted, and steps S2 to S4 are performed using the first glass 1 as the laminated glass, while the other process conditions remain unchanged, to obtain an insulated glass.

[0053] Comparative Example 2

[0054] Compared to Example 1, in the cooling stage of step S1, the temperature is reduced from 118°C to 2°C within 2 hours.

[0055] A composite insulated glass was produced by cooling the glass from -119℃ to room temperature while keeping other process conditions unchanged.

[0056] The composite insulated glass prepared in Examples 1-3 was tested, and the data in Table 2 are as follows:

[0057] Table 2 Thermal insulation data for different types of insulated glass

[0058] Testing items UV transmittance <![CDATA[Heat transfer coefficient (U-value), W / (m 2 *K)]]> Example 1 0.0 1.27 Comparative Example 1 60.2 2.7 Comparative Example 2 10.5 1.8

[0059] The ultraviolet transmittance was tested according to GB / T2680-2021 5.11 and calculated using JGJ / T151-2008; the heat transfer coefficient was tested according to Appendix A of ISO 10292:1994 and calculated using JGJ / T 151-2008.

[0060] As shown in Table 2, the heat transfer coefficient of the insulating glass prepared by the method provided by this invention is as low as 1.4 W / (m²). 2 *K), with an ultraviolet transmittance as low as 0.0%, it represents a significant improvement in thermal insulation compared to existing insulated glass.

[0061] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing composite insulated glass, characterized in that, Includes the following steps: S1: The nano PVB film is held between the first glass and the second glass and placed in a heating device to thermally bond the nano PVB film to the first glass and the second glass to obtain laminated glass. S2: Adhere the bottom surface of the spacer frame to the top surface of the laminated glass with the first sealant, so that the second glass is located inside the spacer frame; S3: The third glass is adhered to the top surface of the spacer frame with the first sealant, so that a hollow cavity is formed between the third glass and the second glass; S4: A second sealant is applied to the outside of the spacer frame to produce a composite insulated glass.

2. The method for preparing composite hollow insulating glass according to claim 1, characterized in that, In step S1, the cooling curve of the heating equipment is from 118℃-119℃ to room temperature, and the cooling time is not less than 2.5 hours.

3. The method for preparing composite hollow insulating glass according to claim 1, characterized in that, The spacer frame is formed by fastening a stainless steel outer frame and a plastic inner frame, and the interior of the spacer frame is filled with 3A molecular sieve.

4. The method for preparing composite hollow insulating glass according to claim 3, characterized in that, Several water vapor holes are provided on the inner plastic frame.

5. The method for preparing composite hollow insulating glass according to claim 1, characterized in that, The first glass is clear glass, and the third glass is coated glass.

6. The method for preparing composite hollow insulating glass according to claim 1, characterized in that, The first sealant is butyl sealant.

7. The method for preparing composite hollow insulating glass according to claim 1, characterized in that, The hollow cavity in step S3 is filled with inert gas.

8. The method for preparing composite hollow insulating glass according to claim 1, characterized in that, The thickness of the first glass, the second glass, and the third glass is 5.8-6.2 mm.

9. The method for preparing composite hollow insulating glass according to claim 8, characterized in that, The thickness of the spacer frame is 10-12 mm.

10. A composite insulated glass, characterized in that, Prepared by the preparation method according to any one of claims 1-9.

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