[Jinhua tempered glass customization] As the low-carbon economy has become a global hotspot, energy-saving materials are increasingly favored by people. In building energy conservation, the light transmission and heat insulation of glass is a very important issue. In large-area buildings with external windows and transparent ceilings, car windows and the like, the heat radiation of sunlight will lead to an increase in energy consumption of air conditioners. , causing a great waste of energy. Therefore, the development of high-efficiency nano-insulation energy-saving coatings is imminent, nano-transparent thermal insulation coatings have become the new darling of energy-saving and environmentally friendly coatings.
The key to transparent thermal insulation coatings is to find nano-semiconductor materials with selective permeability to sunlight. Among them, nano-ATO tin oxide antimony has good visible light transmittance and infrared barrier properties, and is an ideal thermal insulation material. It can be applied to glass (building curtain wall glass, automotive window glass lamp occasions), coatings, coatings, polymer membranes, electronics and other fields. While ensuring sufficient visible light transmission, the solar heat radiation is blocked to a greater extent. The preparation process comprises the steps of: synthesizing the inorganic nano-semiconductor material and the organic high-molecular polymer by a suitable method to obtain a transparent heat-insulating coating having spectral selectivity, and then coating the coating on the glass to form a film. The method does not require complicated equipment, is convenient to construct, and can adjust the types and ratios of the components in the paint according to actual needs, so as to obtain products adapted to different environments.
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example 1:
Preparation of nano ATO slurry
Take a certain amount of ATO nano-powder (according to the data of multiple sets of test data, the addition amount of nano-ATO is 1-10%) in a conical flask, add a certain amount of deionized water, and match it under magnetic stirring conditions. Compared with the sequential addition of the silane coupling agent KH-570 and the dispersant (compared to the dispersing effect of the chelating dispersant, the ionic dispersant, and the block dispersant, it was found that the chelating dispersant disperses the nano ATO slurry to satisfy Coatings with better thermal insulation properties under transparent conditions) are evenly mixed, adjusted to a pH of 7-9, and then subjected to high-speed shearing with an electronic constant-speed stirrer, ultrasonically dispersing the machine to a set time Remove the slurry for later use.
Preparation of transparent thermal insulation coating
Under the condition of magnetic stirring, the nano-ATO aqueous slurry is added into the aqueous polyurethane, and a certain amount of wetting agent, dispersing agent, thickening agent, film forming auxiliary agent and leveling agent are added in a certain proportion to adjust the PH value. 7-9, a combination of high-speed shear dispersion and ultrasonic dispersion (the results show that high-speed shear dispersion for 2h, ultrasonic dispersion for 20min can be used to obtain a well-dispersed slurry, and the prepared coating has excellent heat insulation effect) and is dispersed. Good ATO waterborne polyurethane transparent heat insulation glass coating. If a large amount of air bubbles appear during the stirring process, defoaming agent is added dropwise to defoam. Wenzhou fire glass customization
The composite coating prepared by the nanometer tin oxide strontium ATO aqueous slurry and the aqueous polyurethane resin PU not only has good film forming performance, but also has an infrared blocking rate of 70-75% while maintaining the visible light transmittance of 83%, and the temperature difference after heat insulation. Can maintain at around 7 ° C, in line with the coating has good thermal insulation properties. The study found that the ATO content of 8%, the coating's thermal insulation and hardness, wear resistance, water resistance and adhesion is better.
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Example 2:
Preparation of nano ATO slurry and preparation of transparent thermal insulation coating:
A certain amount of nano-ATO powder and 1.5% silane coupling agent of ATO were weighed, added to a certain amount of 95% ethanol, dispersed by ultrasonic for 40 min, then transferred to a bottle with a reflux device for 4 hours, and vacuum dried at 80 ° C. Add deionized water, dispersant, wetting agent and thickener to the sanding and stirring disperser, stir evenly, add the treated nano ATO, high speed disperse sanding for 6-8h, adjust the pH to 7.5-8.0, and obtain Nano ATO slurry. The film-forming material and the nano-ATO slurry are stirred and mixed, and then an antifoaming agent, a leveling agent, a bactericide, a pH adjuster, and agitation and mixing are added to prepare a transparent heat-insulating paint.
Silicone nano-ATO heat-insulating transparent coating prepared by adding silicone as a film-forming agent and ethanol as solvent. The coating film has good adhesion to glass. The custom temperature difference of Jinhua tempered glass can reach 12-15 °C. The over-rate is over 80%, with good thermal insulation effect and sufficient transparency in the visible light area, and the energy-saving effect is obvious.
The nano-ATO transparent heat-insulating coating prepared by using nano-tin-tin strontium ATO aqueous slurry and silicone emulsion-modified acrylic resin as a film-forming material, the transmittance of the coating film to visible light reaches 81.5%-85%, and the near-infrared light The barrier ratio is 62.5%-65%, and the coating's stain resistance, weather resistance and environmental protection are excellent.
Nano-ATO two-component waterborne polyurethane heat-insulating transparent coating was prepared by adding two-component water-based polyurethane as a film-forming agent, adding nano-tin-oxide (ATO) and using distilled water as solvent. The prepared coating was coated on glass to test the transmittance in the visible light region and the infrared light region and the influence on the heat insulating performance, and the effects of different curing processes on the mechanical properties of the coating were compared. The results show that the nano-ATO transparent thermal insulation coating has good adhesion to glass, the temperature difference can reach 7.3 °C, and the visible light transmittance is 85%. Jinhua tempered glass has good thermal insulation effect and sufficient transparency in visible light. The energy saving effect is remarkable.