A temperable near-infrared reflective low-emissivity glass
By depositing dense silica barrier and protective layers on the glass substrate and using hydrogen and argon to protect the atmosphere at high temperatures, the problem of low-radiation glass in thermal insulation function failure at high temperatures is solved, the near-infrared reflectivity is improved, and the improvement of the near-infrared reflectivity is improved. Its energy-saving and thermal insulation performance in automobiles and buildings.
Patent Information
- Application Number
- CN202011540403.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-23
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2040-12-23
AI Technical Summary
The existing low-radiation glass has failed to insulating function during high-temperature tempering and has low near-infrared reflectivity and absorption rate in sunlight, which limits its application in automobiles and buildings.
A dense silicon dioxide barrier layer and protective layer were deposited on the glass substrate by chemical vapor deposition process, and a reduction protection atmosphere of hydrogen and argon was used at high temperature to form a multilayer structure with high near-infrared reflection function.
The near-infrared reflectivity is significantly improved, ensuring the stability and performance of the glass's thermal insulation function during high temperature treatment, and enhancing its energy-saving and thermal insulation capabilities in automobiles and buildings.
Smart Images
Figure CN112521026B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of automobile and building coated glass production, and in particular relates to a toughened near-infrared reflective low-radiation glass. Background Art
[0002] In recent years, the demand for functional glass in automobiles has been increasing, including energy-saving glass, heat-insulating glass, color-changing glass, radiation-proof glass, etc. The two major types of functional glass are body-tinted float glass and coated glass. Coated glass is a float glass with a coating on its surface to achieve its unique functions, such as low-emission and sunlight control glass. Due to its superior energy-saving performance, coated glass has played an increasingly important role. In particular, low-emissivity glass is not only the first choice for building energy-saving glass, but also online low-emissivity glass has begun to penetrate into automobile glass. However, online low-emissivity glass has low reflectivity and absorptivity for ultraviolet and near-infrared rays in sunlight, and its contribution to the heat insulation and energy saving of automobile glass is relatively small, so it is limited in actual use. Chinese patent CN 103864313A discloses a heat-insulating glass with an infrared reflective multilayer structure and a method for making the same, including a multilayer structure and a silicon dioxide barrier layer, a protective layer and a composite tungsten oxide heat-insulating layer, so that the glass has good heat-insulating function. However, the wet coating barrier layer used in the patent cannot solve the problem of failure of heat insulation function when tempering at high temperature above 700°C due to its poor density;
[0003] The purpose of the present invention is to overcome the defects of online low-radiation and to more than double the near-infrared reflectivity of online low-radiation glass, thereby helping low-radiation glass to enter the automotive energy-saving glass market. Summary of the invention
[0004] The purpose of the present invention is to provide a toughened near-infrared reflecting low-radiation glass, and to apply a heat-insulating precursor having near-infrared reflecting and low-radiation functions to toughened glass coating.
[0005] The present invention provides the following technical solutions:
[0006] A toughened near-infrared reflective low-radiation glass comprises a body-colored float glass substrate, a dense silicon dioxide barrier layer, a functional layer and a dense silicon dioxide protective layer arranged on the float glass substrate, wherein the functional layer is a low-radiation coating capable of realizing near-infrared reflection.
[0007] Furthermore, the body-colored float glass substrate refers to a commercially available colored glass made by adding a colorant with heat-absorbing properties to the raw materials, and the visible light transmittance of the float glass substrate is 40% to 80%.
[0008] Furthermore, the dense silicon dioxide barrier layer and the dense silicon dioxide protective layer are both obtained by the same chemical vapor deposition process CVD, and the thickness of the dense silicon dioxide barrier layer is 600nm to 800nm; the thickness of the dense silicon dioxide protective layer is 300nm to 500nm.
[0009] Furthermore, the constituent material of the functional layer is a commercially available precursor liquid with infrared reflection and low radiation functions, and the functional layer can reflect infrared rays with a wavelength of more than 800nm, and the near-infrared reflectivity is greater than 30%.
[0010] Furthermore, the functional layer is obtained by spraying the precursor liquid on the barrier layer by an ultrasonic sprayer, and the frequency range of the ultrasonic sprayer is 60KHz to 130KHz.
[0011] Furthermore, the functional layer needs to be reduced at high temperature to make the precursors constituting the functional layer react, crack and change phases, specifically as follows: first, 10% hydrogen and 90% argon are mixed and injected into a high-temperature furnace, and then the tempered near-infrared reflective low-emissivity glass is pushed into the high-temperature furnace, and gradually heated to 500-550°C and maintained for 10-20 minutes, and then slowly cooled down to 60°C after 10-30 minutes.
[0012] Preferably, when the glass is hot-bending or tempered, 10% hydrogen and 90% argon are first mixed and then injected into the hot-bending furnace or tempering furnace to complete the hot-bending or tempering of the glass under the protection of the mixed atmosphere.
[0013] Beneficial effects of the present invention:
[0014] The purpose of this application is to avoid structural functional failure during high-temperature processing. A dense barrier layer is chemically deposited (CVD) on a glass substrate to improve the stability of the glass interface and prevent the high-temperature sodium penetration effect from destroying the lattice structure arrangement in the functional layer, causing the functional layer to fail. The functional layer refers to a low-emissivity coating with a higher near-infrared reflection function. A dense protective layer is deposited again by CVD after the functional layer to avoid oxidation of the functional layer during high-temperature processing. By adjusting the density and thickness of the barrier layer, functional layer and protective layer, the performance of the multi-layer structure is optimized. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0016] Figure 1 This is a structural diagram of the present invention. DETAILED DESCRIPTION
[0017] like Figure 1, using chemical vapor deposition (CVD) technology instead of wet coating, depositing a thick and dense silicon dioxide barrier layer of more than 600nm and a protective layer of more than 300nm on the glass substrate, which can effectively block the sodium penetration and oxidation during the high-temperature treatment of glass tempering at more than 700℃, and avoid the failure of the functional layer or performance degradation caused by this. The above-mentioned tempered near-infrared reflective low-emissivity glass needs to be added with a reducing protective atmosphere of 10% hydrogen + 90% argon during high-temperature sintering. The above-mentioned tempered near-infrared reflective low-emissivity glass needs to be subjected to high-temperature reduction treatment, the reduction temperature is 500-550℃, and the holding time is 10-20 minutes. The production process of tempered heat-reflective glass is characterized in that after the glass is sintered at high temperature, it needs to be slowly cooled down to 60℃ in 10-30 minutes to avoid the glass from increasing the stress on the glass surface due to the rapid temperature drop, resulting in a tempering effect, which affects subsequent cutting and other processing. The glass substrate uses body-tinted float glass, which can absorb a large amount of solar infrared heat radiation and reduce the intensity of sunlight. Combined with the infrared reflection and low-radiation functions of the functional layer, it can further increase the glass's barrier to near-infrared sunlight.
[0018] Actual production implementation case:
[0019] A dense silicon dioxide barrier layer with a thickness of 700nm is deposited on the glass substrate numbered #1 by using the chemical vapor deposition CVD process; a transparent heat-insulating precursor liquid with infrared reflection and low radiation functions is sprayed on the barrier layer by using an ultrasonic sprayer with a frequency of 100KHz, and the spraying thickness is adjusted according to the requirement of 30% total near-infrared reflectivity before tempering. After spraying, it is leveled for 6 minutes and sent to a 200℃ oven for drying to form a functional layer. After the functional layer is processed, a dense silicon dioxide protective layer with a thickness of 500nm is deposited on the functional layer by using the chemical vapor deposition process.
[0020] After the three-layer structure is processed, the glass is sent to a 500°C oven for sintering. The oven must first be filled with a protective atmosphere of 10% hydrogen + 90% argon, and the sintering time is maintained for 15 minutes. After the glass is sintered, the temperature is slowly lowered to room temperature after 30 minutes.
[0021] Example 2: All conditions, materials and processes are the same as those in Example 1, except that the thickness of the silicon dioxide barrier layer is reduced from 700 nm to 500 nm to compare the haze and near-infrared reflectivity.
[0022] After the processing of the above three-layer structure is completed, the glass is sent to a tempering furnace for tempering. The tempering furnace needs to be filled with a protective atmosphere of 10% hydrogen + 90% argon.
[0023] Comparison of results #1 #2 Haze 06％ 1.5％ Near infrared reflectivity 35％ 16％
[0024] According to the results of the above embodiments, #1 has better performance, while #2 has increased haze and decreased near-infrared reflectivity by more than half after tempering, indicating that when the barrier layer thickness is less than 500nm, it cannot effectively block sodium penetration and destroy the lattice structure in the functional layer, resulting in a decrease in the performance of its functional layer.
[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A temperable near-infrared reflective low-emissivity glass, characterized in that: The invention comprises a float glass substrate with colored body, a dense silicon dioxide barrier layer, a functional layer and a dense silicon dioxide protective layer provided on the float glass substrate, wherein the functional layer is a low-emissivity coating capable of realizing near-infrared reflection; The thickness of the dense silicon dioxide barrier layer is 600nm to 800nm; the thickness of the dense silicon dioxide protective layer is 300nm to 500nm; The constituent material of the functional layer is a precursor liquid with infrared reflection and low radiation functions, and the functional layer can reflect infrared rays with a wavelength of more than 800nm, and the near-infrared reflectivity is greater than 30%; The functional layer needs to be reduced at high temperature to make the precursors constituting the functional layer react, crack and change phases, specifically as follows: first, 10% hydrogen and 90% argon are mixed and injected into a high-temperature furnace, and then the tempered near-infrared reflective low-emissivity glass is pushed into the high-temperature furnace, and gradually heated to 500-550°C and maintained for 10-20 minutes, and then slowly cooled down to 60°C after 10-30 minutes.
2. The temperable near-infrared reflective low-emissivity glass according to claim 1, characterized in that: The body-colored float glass substrate is made by adding a colorant with heat absorption performance into raw materials, and the visible light transmittance of the float glass substrate is 40% to 80%.
3. The temperable near-infrared reflective low-emissivity glass according to claim 2, characterized in that: The dense silicon dioxide barrier layer and the dense silicon dioxide protective layer are both obtained by adopting the same chemical vapor deposition process CVD.
4. The temperable near-infrared reflective low-emissivity glass according to claim 1, characterized in that: The functional layer is obtained by spraying the precursor liquid on the barrier layer using an ultrasonic sprayer, and the frequency range of the ultrasonic sprayer is 60KHz to 130KHz.
5. The temperable near-infrared reflective low-emissivity glass according to claim 1, characterized in that: When the glass is hot-bending or tempered, 10% hydrogen and 90% argon must be mixed and then injected into the hot bending furnace or tempering furnace to complete the hot bending or tempering of the glass under the protection of the mixed atmosphere.