Thermally induced phase change glass coating material

Abstract

The utility model relates to a thermally induced phase change glass coating material. The thermally induced phase change glass coating material comprises a VO2 layer, a MoO3 layer and a SiO2 layer which are sequentially deposited on a substrate. According to the utility model, the VO2 layer, the MoO3 layer and the SiO2 layer are compounded, so that the problems of low solar energy regulation rate and low weather resistance of the glass can be solved, and intelligent, dynamic and accurate regulation and control of solar energy can be realized.

Description

Technical Field

[0001] The utility model relates to the field of glass coatings, in particular to a thermotropic phase-change glass coating material. Background Art

[0002] Energy and environmental issues are serious challenges facing countries around the world. Transportation energy consumption is listed as one of the three major energy consumers and is receiving significant attention worldwide. Data shows that automobiles account for approximately 20% to 40% of total energy consumption in developing countries. Glass windows, as the primary heat exchange channel between the vehicle interior and the external environment, account for approximately 50% of the heat flowing into or out of the vehicle. Therefore, energy-saving windows and doors are crucial for automotive energy conservation, leading to an urgent need for the development of energy-saving glass.

[0003] Temperature control methods such as air conditioning, cooling, and heating contribute significantly to automotive energy consumption. This is particularly true in southern my country, a region characterized by hot summers and warm winters, where intense summer sunshine results in very high automotive cooling energy consumption. Against the backdrop of global warming, resource depletion, and environmental degradation, the rational utilization of existing non-renewable energy sources and the development and utilization of renewable energy sources are equally important. Traditional automotive window materials perform poorly in thermal management, resulting in inefficient in-vehicle temperature regulation, which in turn increases fuel consumption and battery load (for electric vehicles). Therefore, developing automotive window materials that can automatically adjust their optical and thermal properties based on external temperature changes, and leveraging the materials' light and thermal response properties, which are closely linked to the natural environment, to create intelligent temperature-control and energy-saving systems, is a trend in the energy-saving field and an ideal choice for temperature regulation in other fields, such as automobiles and aerospace.

[0004] Thermochromic materials, which change their optical properties with temperature, are ideal for realizing smart automotive windows. Vanadium dioxide (VO2) is a typical thermochromic material that undergoes a metal-insulator phase transition at approximately 68°C, thereby changing its optical transmittance. At high temperatures, VO2 exhibits a metallic phase with low visible light transmittance and high infrared reflectivity; at low temperatures, it exhibits an insulating phase with high visible light transmittance and low infrared reflectivity. Despite VO2's excellent thermochromic properties, its high phase transition temperature (approximately 68°C) limits its practical application in automotive windows. Furthermore, VO2 thin films are prone to lattice defects during the fabrication process, resulting in a decrease in optical performance. To overcome these issues, researchers have attempted to lower the phase transition temperature of VO2 by doping with other elements (such as tungsten and molybdenum) while simultaneously improving its optical and thermal properties. Furthermore, embedding VO2 nanoparticles into a glass matrix can effectively enhance the material's mechanical strength and durability while maintaining its excellent thermochromic properties. Through sol-gel technology, VO2 nanoparticles can be uniformly dispersed in a glass matrix, resulting in a composite material with high optical transparency and stability. In addition, by rationally designing the composition and structure of the composite material, its thermochromic properties can be further optimized, enabling phase transitions at lower temperatures. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a thermotropic phase change glass coating material, which can solve the problems of low solar regulation rate and weather resistance of glass through the three-layer composite of VO2 layer, MoO3 layer and SiO2 layer, so as to realize intelligent dynamic and precise regulation of solar energy.

[0006] In order to achieve the above-mentioned object, the utility model provides a thermotropic phase change glass coating material, comprising a VO2 layer, a MoO3 layer and a SiO2 layer sequentially deposited on a substrate.

[0007] Preferably, the substrate is a quartz glass substrate with a length of 4-6 cm, a width of 4-6 cm, and a thickness of 0.4-0.6 mm.

[0008] Preferably, the VO2 layer is composed of VO2 nanoparticles.

[0009] Preferably, the particle size of the VO2 nanoparticles is 100-200 nm.

[0010] Preferably, the thickness of the VO2 layer is 100-200 nm.

[0011] Preferably, the MoO3 layer is composed of MoO3 nanoparticles.

[0012] Preferably, the particle size of the MoO3 nanoparticles is 200-300 nm.

[0013] Preferably, the thickness of the MoO3 layer is 200-300 nm.

[0014] Preferably, the SiO 2 layer is composed of SiO 2 nanoparticles.

[0015] Preferably, the particle size of the SiO2 nanoparticles is 100-500 nm.

[0016] Preferably, the thickness of the SiO2 layer is 100-500 nm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The thermochromic glass material described in the utility model is a three-layer composite of VO2 layer, MoO3 layer and SiO2 layer, which can solve the problems of low solar regulation rate and weather resistance of glass, so as to realize intelligent dynamic and precise regulation of solar energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are only some embodiments of the present invention, among which:

[0020] Figure 1 Schematic diagram of the structure of the thermotropic phase change glass coating material according to the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The structures, proportions, sizes, etc. shown in the accompanying drawings are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, so they have no technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0022] like Figure 1As shown, some embodiments of the present invention provide a thermotropic phase-change glass coating material, comprising a VO2 layer 1, a MoO3 layer 2, and a SiO2 layer 3 sequentially deposited on a substrate. The substrate may be a quartz glass substrate. The VO2 layer 1 is composed of VO2 nanoparticles with a thickness of 100-200 nm; the VO2 nanoparticles have a particle size of 100-200 nm; the MoO3 layer 2 is composed of MoO3 nanoparticles with a thickness of 200-300 nm; the MoO3 nanoparticles have a particle size of 200-300 nm; and the SiO2 layer 3 is composed of SiO2 nanoparticles with a thickness of 100-500 nm; the SiO2 nanoparticles have a particle size of 100-500 nm.

[0023] Furthermore, the quartz glass substrate has a length of 4-6 cm, a width of 4-6 cm, and a thickness of 0.4-0.6 mm.

[0024] The method for preparing the above-mentioned thermotropic phase change glass coating material comprises the following steps:

[0025] S1, Preparation of VO2 layer 1: Pour 5g of vanadium pentoxide (V2O5) powder into an agate mortar and grind it thoroughly (particle size is 500nm-1μm) to make the particles finer and mix evenly; then pour it into a small crucible, put it into a muffle furnace and heat it to 700-800℃ to melt it, keep it warm for 20-40min, then take it out and pour it into 200-300ml deionized water and stir it to form VO2 solution; use a puller to coat the VO2 solution on a quartz glass sheet (length and width 5cm*5cm) at a pulling speed of 1500-2000μm / s, an immersion time of 100-120s, and a residence time of 100-120s; after pulling once, put it into an oven at a temperature of 70-80℃ and dry it for 20-40min;

[0026] S2, preparation of MoO3 layer 2: weigh 1.5g of MoO3 powder, pour it into an agate mortar and grind it thoroughly (particle size is 500nm-1μm) to make the particles finer and mix evenly; then pour it into a small crucible, put it into a muffle furnace and heat it to 700-800℃ to melt it, keep it warm for 20-40min, take it out and pour it into 200-300ml deionized water and stir to form a MoO3 solution; use a pulling machine to coat the MoO3 solution on the quartz glass sheet coated with VO2 obtained in step S1 (length and width 5cm*5cm), the pulling speed is 1500-2000μm / s, the immersion time is 100-120s, and the residence time is 100-120s; after pulling once, put it into an oven at a temperature of 70-80℃ and dry it for 20-40min;

[0027] S3, preparation of SiO2 layer 3: 1) take a dry beaker and add an appropriate amount of anhydrous ethanol, the volume of which accounts for 70%-80% of the total volume of the Stober reaction solution; 2) slowly add ethyl orthosilicate (concentration of 0.2-1.0M, based on the total amount of the Stober reaction solution, that is, the volume ratio is 20-50%) to the anhydrous ethanol, and stir evenly to ensure that the ethyl orthosilicate is completely dissolved; 3) while stirring, slowly add ammonia water, the mass percentage concentration of ammonia water is 25%, and the volume is 2-5 times that of ethyl orthosilicate. The ammonia water will increase the pH value of the reaction system to 9-11. The reaction is carried out at room temperature (20-25 ° C) and the reaction time is 2-10 hours to obtain a solution containing SiO2 nanoparticles, the SiO2 nanoparticles are between 100nm-500nm; the above-obtained The solution containing SiO2 nanoparticles is coated on the quartz glass sheet (5cm*5cm in length and width) coated with VO2+MoO3 obtained in step S2 using a pulling machine at a pulling speed of 1500-2000μm / s, an immersion time of 100-120s, and a residence time of 100-120s. After one pulling, the sheet is placed in an oven at a temperature of 70-80°C and dried for 20-40 minutes. Finally, the dried quartz glass sheet is placed in a tube furnace, the tube furnace is evacuated, and then the temperature is raised to 500-600°C and annealed for 10-30 minutes to obtain a three-layer thin film material, that is, the thermotropic phase change glass coating material. The three-layer thin film material has a transmittance of 70-80% in the visible light range (400-700nm) and a transmittance of 40%-50% in the near-infrared region (700-1100nm).

[0028] The present invention will be further described below with reference to specific embodiments.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a thermotropic phase-change glass coating material comprising a VO2 layer 1, a MoO3 layer 2, and a SiO2 layer 3 sequentially deposited on a substrate. The substrate may be a quartz glass substrate having a length of 5 cm, a width of 5 cm, and a thickness of 0.5 mm. The VO2 layer 1 is composed of VO2 nanoparticles with a thickness of 200 nm; the VO2 nanoparticles have a particle size of 200 nm; the MoO3 layer 2 is composed of MoO3 nanoparticles with a thickness of 300 nm; the MoO3 nanoparticles have a particle size of 300 nm; and the SiO2 layer 3 is composed of SiO2 nanoparticles with a thickness of 100-500 nm; the SiO2 nanoparticles have a particle size of 200 nm.

[0031] The method for preparing the above-mentioned thermotropic phase change glass coating material comprises the following steps:

[0032] S1, Preparation of VO2 layer 1: Weigh 5g of V2O5 and 5g of vanadium pentoxide (V2O5) powder, first pour it into an agate mortar and grind it thoroughly (particle size is 1μm); then pour it into a small crucible, put it into a muffle furnace and heat it to 800℃ to melt it. After keeping it warm for 30 minutes, take it out and pour it into 200ml of deionized water and stir it to form a VO2 solution; use a puller to coat the VO2 solution on a quartz glass sheet (length * width * thickness, 5cm*5cm*0.5mm) with a pulling speed of 1500μm / s, an immersion time of 100s, and a residence time of 100s; after one pulling, put it into an oven at 80℃ and dry it for 30 minutes;

[0033] S2, preparation of MoO3 layer 2: weigh 1.5g of MoO3 powder, pour it into an agate mortar and grind it thoroughly (particle size is 1μm) to make the particles finer and mix evenly; then pour it into a small crucible, put it into a muffle furnace and heat it to 800℃ to melt it, keep it warm for 30min, take it out and pour it into 200ml deionized water and stir to form a MoO3 solution; use a pulling machine to coat the MoO3 solution on the VO2-coated quartz glass sheet obtained in step S1 (length and width 5cm*5cm), the pulling speed is 1500μm / s, the immersion time is 100s, and the residence time is 100s; after pulling once, put it into an oven at 80℃ and dry it for 30min;

[0034] S3, preparation of SiO2 layer 3: 1) take a dry beaker and add an appropriate amount of anhydrous ethanol, the volume of which accounts for 80% of the total volume of the Stober reaction solution; 2) slowly add ethyl orthosilicate (concentration is 0.5M, based on the total amount of the Stober reaction solution, i.e., the volume ratio is 30%) to the anhydrous ethanol, and stir evenly to ensure that the ethyl orthosilicate is completely dissolved; 3) while stirring, slowly add ammonia water, the mass percentage concentration of ammonia water is 25%, and the volume is twice that of ethyl orthosilicate. Ammonia water will increase the pH value of the reaction system to 10. The reaction is carried out at room temperature (25°C) for 2 hours to obtain a solution containing SiO2 nanoparticles, the SiO2 nanoparticles are between 100nm and 500nm; the above-mentioned The obtained solution containing SiO2 nanoparticles is coated on the quartz glass sheet (length and width 5cm*5cm) coated with VO2+MoO3 obtained in step S2 using a pulling machine, with a pulling speed of 1500μm / s, an immersion time of 100s, and a residence time of 100s; after one pulling, the quartz glass sheet is placed in an oven at a temperature of 80°C and dried for 30 minutes; finally, the dried quartz glass sheet is placed in a tube furnace, the tube furnace is evacuated, and then the temperature is raised to 500°C and annealed for 30 minutes to obtain a three-layer thin film material, that is, the thermotropic phase change glass coating material, which has an average transmittance of 79% in the visible light range (400-700nm) and an average transmittance of 49% in the near-infrared region (700-1100nm).

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thermotropic phase change glass coating material, characterized in that: It includes a VO2 layer, a MoO3 layer and a SiO2 layer deposited on a substrate in sequence.

2. The thermotropic phase change glass coating material according to claim 1, wherein: The base is a quartz glass substrate with a length of 4-6 cm, a width of 4-6 cm and a thickness of 0.4-0.6 mm.

3. The thermotropic phase change glass coating material according to claim 1, wherein: The VO2 layer is composed of VO2 nanoparticles; the particle size of the VO2 nanoparticles is 100-200nm.

4. The thermotropic phase change glass coating material according to claim 1, wherein: The thickness of the VO2 layer is 100-200 nm.

5. The thermotropic phase change glass coating material according to claim 1, wherein: The MoO3 layer is composed of MoO3 nanoparticles; the particle size of the MoO3 nanoparticles is 200-300nm.

6. The thermotropic phase change glass coating material according to claim 1, wherein: The thickness of the MoO3 layer is 200-300 nm.

7. The thermotropic phase change glass coating material according to claim 1, wherein: The SiO2 layer is composed of SiO2 nanoparticles; the particle size of the SiO2 nanoparticles is 100-500nm.

8. The thermotropic phase change glass coating material according to claim 1, wherein: The thickness of the SiO2 layer is 100-500nm.

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