[China Glass Network] In recent years, the state has introduced a number of policies on building energy conservation, and proposed a new building to achieve energy-saving 50%, and all existing buildings will achieve the goal of energy-saving renovation in 2020. Windows, which occupy 48% of the building's heat source, must be the top priority in the transformation project. With the wide application of glass deep-processing products such as insulating glass, Low-E glass and coated glass in building energy conservation, another new glass energy-saving material, namely glass heat-insulating coating, has also joined the ranks of energy-saving products. Zhisheng Weihua's ZS-311 glass insulation coating is a representative product of the industry. Its unique heat insulation and cooling performance and excellent anti-aging, stain-resistant self-cleaning, anti-static, anti-glare, anti-radiation and other properties, The insulation coatings industry has always been at the forefront.
The glass heat-insulating coating is a functional coating which is applied to the surface of the glass and maintains a certain visible light transmittance to improve the glass shielding coefficient as the main heat insulation method. The key to glass insulation coatings is to ensure both light transmission and thermal insulation, which means that solar radiation energy can only be selectively isolated. The solar radiation energy is distributed at a wavelength of 300 to 2500 nm, wherein the ultraviolet portion accounts for 14%, the visible portion accounts for 40%, and the infrared portion accounts for 44%. However, for ordinary ordinary transparent glass, it has a high transmittance to the entire solar spectrum, especially the infrared partial transmittance is relatively high, and apparently has no blocking effect on solar radiation, that is, no heat insulation effect. Zhisheng ZS-311 glass insulation coating is jointly developed by Zhisheng Weihua and the military. Its main component is indium tin oxide. Due to the unique properties of indium tin oxide, it has ideal selectivity for solar spectrum. Know the material that is better in the comprehensive performance of thermal insulation problems in semiconductor materials. Therefore, the selection of nano indium tin oxide to prepare a transparent heat-insulating coating can ensure its high performance.
The glass heat-insulating coating quickly forms a transparent, smooth and strong polymer coating on the glass surface by spraying, dipping and the like. The coating should not only have good hardness, adhesion, temperature resistance, solvent resistance, freeze-thaw resistance and other conventional coating properties, but also enhance the near-infrared band of 780 nm or more by virtue of the addition of metal oxides such as nano-Al2O3 and nano-TiO2. Reflection function. ZS-311 glass insulation coatings are divided into solvent-based coatings and water-based coatings. Among them, solvent-based glass insulation coatings appeared earlier, and occupied a certain market because of its good coating effect and adhesion. However, with the improvement of environmental awareness and the improvement of environmental laws and regulations, water-based coatings have received great attention. Beijing Zhisheng Weihua Coatings R&D Department has long started to develop and develop water-based glass thermal insulation coatings and achieved good results. .
Glass insulation coating is a functional coating used for heat insulation on a special substrate such as glass. In addition to the basic application properties of the coating (such as hardness, adhesion, weather resistance, etc.), its optical properties The assessment is also indispensable. At present, the author analyzes the functional properties of such materials on the market from the two aspects of material basic properties and material optical properties. A total of 8 samples, including Zhisheng Weihua's solvent-based and water-based coatings, and the other 6 manufacturers have 3 solvent-based and 3 aqueous.
First, the basic performance
The evaluation of the basic properties of the coating mainly includes four aspects: before use, at the time of film formation, after film formation, and after aging. Among them, there is no significant difference between the products in the container, the low temperature stability, and the temperature resistance of the coating. They all meet the relevant requirements in the GB/T9755-2001 standard. They are not described in detail here, and the other projects are analyzed. Description.
1, film formation performance
(1) Appearance of coating film: Since the construction process of glass coating is different from that of architectural coating, the wire bar sample is changed to spray or applicator to prepare the film to ensure the uniformity of the film. By using 8 applicators for sample preparation, the samples of the other 6 manufacturers all showed different degrees of film unevenness due to cohesion of the coating, and the unevenness disappeared after spraying. Zhisheng brand ZS-311 products have no pinholes, sag, fish eyes, cohesion, etc., and the coating is even and beautiful.
(2) Drying time: For glass coatings, the shorter the drying time, the less likely the coated glass will be subjected to secondary pollution of dust in the air. Therefore, the drying time should not be too long. Through experiments, it is found that among the 8 products, Zhisheng ZS-311 has a dry time of 5 minutes, and the other 6 manufacturers' products are 10 minutes faster and 53 minutes slower, showing faster drying characteristics.
2, film formation performance
The post-filming performance test is mainly based on the material's own characteristics and the influencing factors in the application, mainly related to four aspects of water resistance, acid and alkali resistance, hardness and adhesion.
(1) Most of the products in the hardness test of the pencil reached the H level or higher. Among them, Zhisheng brand ZS-311 product hardness is 2H, and the other 7 manufacturers' products also reach HB, which is higher than the B grade requirement of HG/T3828 "Indoor Waterborne Wood Coatings".
(2) For the detection of acid and alkali resistance of coating film, most of the materials have good water resistance and weak alkali resistance, and there is no membranous morbidity such as air bubbles, powder drop, and obvious discoloration. However, if you use 1mol/L sodium hydroxide or 1mol/L hydrochloric acid solution for 1d as required in JC846, except for Zhisheng ZS-311, the products of other 6 manufacturers will have different degrees of foaming and wrinkling. , shedding and other phenomena.
(3) Adhesion reflects the degree of firmness of bonding between the coating film and the glass substrate. Among the 8 products examined, the adhesion of Zhisheng Weihua's waterborne and solvent-based coatings is 0; among the other 6 products, 1 is 0, 3 is 1 and 1 is 2, adhesion performance Good, only one sample was grade 5 before the primer was applied, but after the primer was applied, the improvement was improved to level 0.
(4) Performance after UV aging Glass insulation coatings are used for sunlight exposure in the past year. Therefore, in order to indirectly reflect the application life of the materials, eight products were subjected to ultraviolet aging. The test used Q-UV ultraviolet aging instrument to irradiate the sample for 240 hours under the light intensity of 0.68W/m2 in the 340nm band. After irradiation, there was no phenomenon of powdering and falling off, and 1mm cross-cutting method. The degree of damage of adhesion is 0.
Second, optical performance
The optical performance test mainly includes five aspects of detecting the visible light transmittance, the total solar transmittance, the shielding coefficient, the ultraviolet transmittance, and the hemispherical emissivity of the sample. In addition, it is also considered whether there is a significant loss of insulation effect after aging of the product, so the visible light transmittance and the shielding factor should be re-measured after UV aging. This test was carried out in accordance with the test method described in GB/T 2680-94.
1. The optical performance test results are summarized as follows: According to the test results, the visible light transmittance of each glass thermal insulation coating after film formation is high, concentrated in 60% to 80%, of which Zhisheng Weihua's ZS-311 is higher, up to 81.37. And 83.18%. Hemispherical emissivity is greater than 87%. The shielding factor, Zhisheng Weihua's ZS-311 is 91.86% and 92.21%, the other 6 manufacturers have a larger value of 79.30%, and the smaller value is only 64.31%.
2. After the product has been irradiated by Q-UV UV aging instrument with a light intensity of 0.68W/m2 in the 340nm band for 240h, the water-based and solvent-based products of Zhisheng Weihua's ZS-311 have not changed. The other 6 manufacturers have The visible light transmission rate of the products of the two manufacturers was slightly reduced, and the shielding coefficient was also slightly reduced, maintaining good energy saving effect. In addition, some products have a good barrier effect on ultraviolet light, and the ZS-311 and other two manufacturers have a UV transmittance of almost zero.
Combining the above two aspects of performance testing, in terms of basic performance, ZS-311 glass thermal insulation coating is more resistant to strong acid and alkali, and other properties are slightly better or equivalent. In terms of optical properties, ZS-311 is more prominent in the shielding factor and ultraviolet transmittance, visible light transmittance, hemispherical emissivity and post-aging performance changes are comparable or slightly higher than other manufacturers.
Thanks to its excellent performance in all aspects, Zhisheng Weihua ZS-311 glass heat-insulating coating is easy to construct, has a wide application range and long service life. It not only has good light transmission, but also can effectively isolate solar heat radiation. It only needs to apply a thickness of several micrometers to make the indoor and outdoor temperature difference reach about 6 degrees Celsius, the infrared shielding rate is over 70%, and the visible light transmittance is 80%. 85%, the UV blockage reaches 99%, even if you do not open the air conditioner, you can achieve the effect of "warm winter and cool summer", which can be widely used in automobiles and various buildings.
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