CN-121403813-B - Solar photo-thermal glass and preparation method thereof

Abstract

The invention provides solar photo-thermal glass and a preparation method thereof, which belong to the technical field of photo-thermal glass and comprise the following steps of S1, preparing a PVB base photo-thermal phase transition intermediate film; S2, preparing laminated glass, S3, pouring Cs x WO 3 coating liquid on the outer surface of the laminated glass, doctor-blading to form a film, heating and drying to form a Cs x WO 3 coating on the outer surface, and thus obtaining the solar photo-thermal glass. The invention can improve the solar photo-thermal conversion efficiency and simultaneously maintain good light transmittance.

Inventors

• DONG ZHIYONG
• Liang xiling
• ZHAO WEI
• GUO GAOLIANG

Assignees

• 陕西绿能先导科技有限责任公司

Dates

Publication Date

20260512

Application Date

20251208

Claims (8)

1. 1. The preparation method of the solar photo-thermal glass is characterized by comprising the following steps of: S1, dry-mixing PVB resin powder, znO/h-BN@PDA composite powder and an auxiliary agent, feeding the dry-mixed PVB resin powder, znO/h-BN@PDA composite powder and the auxiliary agent into a double-screw extruder, carrying out melt mixing at 140-160 ℃, regulating the temperature to 100-120 ℃, adding paraffin microcapsules, continuing melt mixing, extruding, calendaring into sheets, cooling and solidifying to obtain a PVB-based photo-thermal phase change intermediate film; S2, spreading an intermediate film on the surface of a piece of pretreated glass substrate, covering a second piece of pretreated glass substrate above the intermediate film, heating and prepressing in vacuum, placing the glass substrate into an autoclave, heating, standing at high pressure, naturally cooling to room temperature, trimming and polishing to obtain laminated glass; S3, pouring Cs x WO 3 coating liquid on the outer surface of the laminated glass, carrying out blade coating to form a film, heating and drying to form a Cs x WO 3 coating on the outer surface, and thus obtaining solar photo-thermal glass; the ZnO/h-BN@PDA composite powder is obtained by uniformly mixing 500-800 parts by volume of deionized water and 1.5-2 parts by mass of dopamine hydrochloride, using NaHCO 3 to slowly adjust the pH of the solution to 8.0-8.7, slowly adding ZnO/h-BN dispersion liquid, magnetically stirring for 10-12 h, centrifuging for 10-20 min at 6000-8000 rpm, removing supernatant, sequentially washing precipitate with deionized water and absolute ethyl alcohol for 2-3 times, vacuum drying for 12-16 h at 70-80 ℃, grinding and sieving, wherein the ZnO/h-BN dispersion liquid is obtained by adding 0.8-1.2 parts by mass of nano zinc oxide powder and 0.4-0.7 part by mass of hexagonal boron nitride nano powder into 450-550 parts by volume of 50% ethanol aqueous solution, and performing ultrasonic dispersion for 30-40 min.
2. 2. The preparation method of the solar photo-thermal glass according to claim 1 is characterized in that in the step S1, 180-230 parts by mass of PVB resin powder, 0.8-1.5 parts by mass of ZnO/h-BN@PDA composite powder and an auxiliary agent are dry-mixed at room temperature and rotational speed of 800-1000 rpm for 10-15 min, the dry-mixed powder is fed into a double screw extruder, the melt-mixed powder is subjected to melt-mixing at 140-160 ℃ for 3-5 min, then the barrel temperature is regulated to 100-120 ℃ at the rear section of the double screw extruder, 40-55 parts by mass of paraffin microcapsules are added, the melt-mixed powder is continuously subjected to melt-mixing for 2-3 min, extruded, rolled into sheets, cooled and solidified to obtain a PVB-based photo-thermal phase-change intermediate film, and the auxiliary agent is 35-60 parts by mass of trioctyl trimellitate, 0.4-0.6 parts by mass of ultraviolet absorber and 0.3-0.5 part by mass of hindered amine light stabilizer.
3. 3. The preparation method of the solar photo-thermal glass according to claim 1, wherein the pretreated glass substrate is obtained by sequentially placing low-iron float glass in propanol, absolute ethyl alcohol and deionized water, ultrasonically cleaning for 10-15 min, and drying for 30-40 min at 55-65 ℃.
4. 4. The method for preparing solar photo-thermal glass according to claim 1, wherein in the step S2, a piece of pretreated glass substrate is laid on a stainless steel table surface paved with a silica gel pad, an intermediate film is laid on the surface of the pretreated glass substrate, a second piece of pretreated glass substrate is covered above the intermediate film, after the two pieces of glass are completely attached through the intermediate film, the glass is sent into a vacuum pre-pressing device, after the glass is kept for 10-20 min under the vacuum degree of minus 0.08 to minus 0.06MPa and the vacuum degree of 60-80 ℃, a pre-composite blank is obtained by rolling, the glass is placed into an autoclave, the temperature is raised to 130-140 ℃, the pressure is maintained for 30-60 min under the pressure of 0.8-1.2 MPa, the glass is cooled to room temperature slowly, and the glass is trimmed and polished to obtain the laminated glass.
5. 5. The preparation method of the solar photo-thermal glass according to claim 1 is characterized in that 25-30 parts by mass of polyvinyl alcohol is added into 240-260 parts by volume of deionized water, magnetic stirring is carried out at 70-80 ℃ for 1.5-3 hours, cs x WO 3 dispersion liquid is added, magnetic stirring is continued for 60-80 minutes, and the Cs x WO 3 dispersion liquid is obtained by adding 6.2-6.7 parts by mass of cesium tungsten bronze powder and 0.25-0.35 part by mass of polyvinylpyrrolidone into 240-260 parts by volume of deionized water, and ultrasonic dispersing is carried out for 100-120 minutes.
6. 6. The preparation method of the solar photo-thermal glass according to claim 1 is characterized in that heating and drying are carried out in the step S3 for 30-60 min at 60-80 ℃, after a Cs x WO 3 coating is formed on the outer surface through high-temperature drying, spraying treatment is carried out on the outer surface through HF-SiO 2 suspension, HF-SiO 2 suspension is evenly sprayed on the surface of the Cs x WO 3 coating, and the HF-SiO 2 outer layer is formed through drying at 120-130 ℃ for 60-80 min, so that the solar photo-thermal glass is finally obtained.
7. 7. The preparation method of solar photo-thermal glass according to claim 6, wherein the HF-SiO 2 suspension is prepared by adding 2.8-3.2 parts by mass of fumed silica into 400-500 parts by volume of absolute ethyl alcohol, magnetically stirring for 20-30 min, then dispersing for 20-30 min by ultrasonic, dropwise adding 0.3-0.4 part by volume of ammonia water with the concentration of 0.01mol/L and 0.8-1.2 parts by volume of 1H, 2H-perfluoro decyl trimethoxy silane under continuous stirring, stirring and reacting for 6-8 h, and carrying out ultrasonic treatment for 20-40 min.
8. 8. A solar photo-thermal glass, characterized in that the solar photo-thermal glass is prepared by the preparation method of any one of claims 1-7.

Description

Solar photo-thermal glass and preparation method thereof Technical Field The invention relates to the technical field of photo-thermal glass, in particular to solar photo-thermal glass and a preparation method thereof. Background The photo-thermal glass is used as a special functional glass material, has the capability of converting part of solar radiation into heat energy, and has good application prospect in the fields of solar energy utilization, building energy conservation, winter heating, special energy-saving building envelope and the like. Along with the continuous improvement of the requirements of high-performance buildings on energy conservation and comfort, the solar photo-thermal glass which can realize lighting and effectively regulate and control solar energy gradually becomes a research direction. Currently, solar photo-thermal glass has been used for high-performance building exterior windows, glass curtain walls, daylighting roofs, sunlight rooms and special building components which partially require transparent enclosures while taking into account energy conservation requirements. The existing solar photo-thermal glass generally improves the absorptivity of the glass to solar energy by introducing a photo-thermal conversion material into a glass system, so that the surface temperature or the internal temperature of the glass is increased, and the energy consumption of traditional heating or heating equipment is reduced. The photo-thermal conversion material can be made into a film to be coated on the surface of glass, and can be doped into a glass body during glass melting, and the engineering mainly has several common methods, namely, firstly, a metal film, a metal oxide film or a low-radiation film is deposited on the surface of float glass or toughened glass by physical vapor deposition, chemical vapor deposition and other methods, secondly, an inorganic or organic-inorganic composite coating containing photo-thermal conversion particles is uniformly coated on the surface of the glass by adopting a sol-gel, spraying, roller coating and other wet processes, and thirdly, a specific metal oxide, an infrared absorbing agent or nano particles are added during glass melting, so that the glass body has a specific sunlight transmission/absorption spectrum, and further, the effect of improving the solar energy absorptivity of the glass is achieved. However, the existing technical scheme for preparing solar photo-thermal glass by using the photo-thermal conversion material still has a plurality of unresolved problems. On the one hand, when the photothermal conversion material is doped into the glass body, the material needs to undergo a high-temperature melting and forming process, and part of functional particles are unevenly dispersed and are easy to agglomerate, so that new bubbles and stress defects are introduced, the mechanical strength of the glass is affected, and the problem of light transmittance reduction easily occurs. On the other hand, when the light-heat conversion material exists on the surface of glass in the form of a coating, the light-heat conversion material needs to be subjected to multiple actions such as sunlight exposure, rapid cooling and heating, rain wash and the like, and the problems such as ageing of the coating and failure of the light-heat conversion material are easily caused. Therefore, there is a need to provide a solar photo-thermal glass and a preparation method thereof, so as to solve the problems of the prior art. Disclosure of Invention In view of the above, the present invention provides a solar photo-thermal glass and a preparation method thereof, which can improve the solar photo-thermal conversion efficiency and maintain good light transmittance. In order to achieve the above purpose, the invention provides a preparation method of solar photo-thermal glass, comprising the following steps: S1, dry-mixing PVB resin powder, znO/h-BN@PDA composite powder and an auxiliary agent, feeding the dry-mixed PVB resin powder, znO/h-BN@PDA composite powder and the auxiliary agent into a double-screw extruder, carrying out melt mixing at 140-160 ℃, regulating the temperature to 100-120 ℃, adding paraffin microcapsules, continuing melt mixing, extruding, calendaring into sheets, cooling and solidifying to obtain a PVB-based photo-thermal phase change intermediate film; S2, spreading an intermediate film on the surface of a piece of pretreated glass substrate, covering a second piece of pretreated glass substrate above the intermediate film, heating and prepressing in vacuum, placing the glass substrate into an autoclave, heating, standing at high pressure, naturally cooling to room temperature, trimming and polishing to obtain laminated glass; S3, pouring the Cs xWO3 coating liquid on the outer surface of the laminated glass, carrying out blade coating to form a film, heating and drying to form a Cs xWO3 coating on the outer surface, and thus obtaining the solar pho