CN102744935B - Energy-saving coated glass - Google Patents

Abstract

In the energy-saving coated glass disclosed by the invention, a silicon film layer, a silicon oxide mesoporous film layer and a fluorine-doped tin oxide film layer are sequentially coated on a glass substrate from bottom to top. Its silicon film layer is used as a solar control film, which can reflect near-infrared radiation under strong sunlight, greatly improving the shading coefficient and reducing outdoor heat from entering the room in summer; the silicon oxide mesoporous film layer uses the porous structure of the mesoporous film as a transparent Heat insulation film can block heat conduction and reduce indoor and outdoor heat transfer; fluorine-doped tin oxide film layer is used as a low-emissivity film to reduce mid- and far-infrared radiation from the room and reduce heat loss in winter. The energy-saving coated glass of the present invention is not only suitable for the south, but also suitable for the north where the temperature difference between winter and summer is relatively large, thereby increasing the application range of the coated glass for building.

Description

Energy-saving coated glass

technical field

The invention relates to an energy-saving coated glass for building.

Background technique

Building energy conservation is one of the important issues that need to be solved urgently in the current economic development. In my country's building energy consumption, the energy consumption caused by glass doors and windows accounts for 56% of the heat dissipation of the entire building, and it is as high as more than 90% in curtain wall buildings. At present, architectural coated glass such as solar control, low radiation and phase change energy saving can only achieve energy saving by controlling the transmittance of light in each band to resist heat radiation, and direct heat conduction is another important way for indoor and outdoor heat exchange of buildings. Therefore, it is urgent to study high-efficiency and energy-saving coated glass that is suitable for the climate and environment of our country and has both thermal radiation resistance and thermal conductivity barrier properties.

Contents of the invention

The object of the present invention is to provide an energy-saving coated glass suitable for climate environments with large temperature differences between winter and summer.

The energy-saving coated glass of the present invention is coated with a silicon film layer, a silicon oxide mesoporous film layer and a fluorine-doped tin oxide film layer sequentially from bottom to top on a glass substrate.

The preparation method of energy-saving coated glass: firstly, the silicon film layer is deposited on the glass substrate by the chemical vapor deposition method. The silicon oxide mesoporous film layer, the thickness of the film layer is determined by the number of repeated coatings, the film thickness is generally 10~40 microns, and then the fluorine-doped tin oxide film layer is sprayed on the silicon oxide mesoporous film layer by thermal spraying method, the film The layer thickness is 300~400nm.

Since the energy-saving coated glass of the present invention has a multi-layer structure, its silicon film layer is used as a sunlight control film, which can reflect near-infrared wavelengths and greatly improve the shading coefficient; the silicon oxide mesoporous film layer uses the porous structure of the mesoporous film as a transparent heat insulation film. The film can block heat conduction; the fluorine-doped tin oxide film layer is used as a low-emissivity film, which can reflect mid-to-far infrared radiation and reduce heat loss in the house.

Beneficial effects of the present invention: the multi-layer energy-saving film glass not only reduces the heat loss and transfer caused by heat radiation, but also its silicon oxide mesoporous film reduces the direct transfer of heat. In the north, increase the scope of application of coated glass for buildings.

Description of drawings

Figure 1 is a schematic diagram of the composition of energy-saving coated glass.

Figure 2 is a schematic diagram of energy-saving coated glass.

Detailed ways

Below in conjunction with accompanying drawing and example further illustrate the present invention.

Referring to FIG. 1 , the energy-saving coated glass of the present invention is coated with a silicon film layer 2 , a silicon oxide mesoporous film layer 3 and a fluorine-doped tin oxide film layer 4 sequentially from bottom to top on a glass substrate 1 .

Example 1

1) Using chemical vapor deposition method to simulate the online coating process of float glass to coat silicon film:

The raw material gas is silane (10% SiH ₄ ) and ethylene (C ₂ H ₄ ) diluted with N ₂ , the substrate is ordinary 5mm thick white glass, and the substrate is fixed in the constant temperature zone of the quartz tube. The nozzle moving at a uniform speed is ejected, and the speed of the nozzle is the substrate speed of the actual production line. The ratio of C ₂ H ₄ /SiH ₄ in the laboratory is 0.5, the deposition temperature is 650°C, and the thickness of the deposited silicon film is 70nm.

2) Prepare mesoporous silica membrane by sol-gel method:

The experimental raw materials are tetraethyl orthosilicate, absolute ethanol, hydrochloric acid (mass concentration 36%), deionized water and cetyltrimethylammonium bromide, and the total molar ratio of each component of the precursor is TEOS : EtOH : HCl : H ₂ O : CTAB = l : 25 : 0.005 : 8 : 0.1;

First, the glass substrate pre-coated with Si film was washed with detergent, ethanol and deionized water in sequence, and then dried at 70°C for use;

Next, mix tetraethyl orthosilicate TEOS, absolute ethanol, water and hydrochloric acid in a molar ratio: 1: 15: 8: 0.005, partially hydrolyze under acidic conditions, stir for 1 h to form solution A, and then press the ethanol solution of CTAB by CTAB/TEOS molar ratio is 0.1 : 10 and added to solution A. After the solution is aged for one day, SiO ₂ sol is formed. Pour the prepared SiO ₂ sol into the sprayer, pressurize to 1.5 atm, and the glass substrate travels at a speed of 2 m/ min, spray SiO ₂ sol, SiO ₂ mesoporous film thickness 10 microns;

Finally, the coated glass substrate was dried at room temperature for 24 h, completely dried at 60 °C, and then calcined at 500 °C for 2 h to obtain the _SiO2 mesoporous film.

3) Preparation of fluorine-doped tin oxide film by thermal spraying method:

The raw materials used are tin tetrachloride, ammonium fluoride and water, SnCl ₄ : NH ₄ F : H ₂ O = 1 : 0.2 : 5, the substrate is maintained at a temperature of 450°C, and the spraying liquid is sprayed by an atomizing gun through an air compression system The distance between the nozzle of the spray gun and the substrate is 10cm, the flow rate of the spray gun is 1.5L/min, the number of sprays is 10 times, each spray is 2s, and the interval between each spray is 5min, and the thickness of the fluorine-doped tin oxide film is 400nm.

The light transmittance of the coated glass obtained in this example is 20%~30%.

Refer to Figure 2 for the energy-saving principle diagram of coated glass.

The coated glass of the invention can not only block the direct conduction of heat but also resist heat radiation. In cold climates, blocking the loss of indoor heat to the outside is key to saving energy. The SiO ₂ mesoporous film blocks heat conduction and prevents indoor heat from being transmitted to the outside; at the same time, the fluorine-doped tin oxide low-emissivity film on the indoor side reflects the mid- and far-infrared radiation from indoor human objects to minimize the loss of indoor heat to the outside. In hot climates, blocking outdoor heat from entering the interior is key to saving energy. The SiO ₂ mesoporous film blocks heat conduction and prevents the transfer of outdoor heat to the room. At the same time, when the outdoor hot object radiates to the window glass, the Si-O bond vibrating glass will absorb almost all mid-far infrared light with a wavelength greater than 4.5 μm and heat up. At this time, the mesoporous thermal insulation film can also block the heat transfer of the glass. The conduction to the room makes this part of the heat dissipate to the outside through air convection. In addition, when strong sunlight hits the glass, the near-infrared part of the heat is reflected back to the outside by the solar control film (silicon film). In this way, the influence of outdoor heat on the interior will be greatly weakened.

Claims (1)

1. an energy-conservation coated glass, the silicon oxide mesoporous rete (3) it is characterized in that there is silicon film (2) from bottom to top successively on glass substrate (1), adopting sol-gel process to prepare and fluorine doped tin oxide rete (4), wherein, the thickness of silicon film (2) is 60 ~ 80nm, the thickness of silicon oxide mesoporous rete (3) is 10 ~ 40 μm, and the thickness of fluorine doped tin oxide rete (4) is 300 ~ 400nm.