Small molecules lead building materials revolution

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Small molecules lead the building materials revolution and self-cleaning innovation of nano glass

with the advent of the dust season in Beijing, many people began to worry about the surface cleaning of the new landmark in Beijing - the National Grand Theater. The appearance of the oval transparent eggshell structure is very inconvenient if the traditional manual cleaning method is adopted. The window cleaning machine is installed at the top of the floor, and the "foothold" of the installation can not be found if the robot is used for cleaning. Cleaning 6000 square meters of glass exterior walls seems to be an "impossible" task in dusty weather

fortunately, the National Grand Theater has adopted a new type of nano self-cleaning glass, that is, a layer of nano titanium dioxide film is plated on the surface of the traditional glass. Dust coverage can be avoided to the greatest extent. In rainy days, the stains on the outer surface of the glass curtain wall will fall off automatically. Now, this new nano material has been widely used in new large buildings in Beijing, including the new tower of Beijing Capital Airport and Wukesong Gymnasium, one of the Olympic venues

show their talents in Beijing's landmark buildings

there is no difference between Nano coated glass and ordinary glass, but its surface has super hydrophilic properties. This feature enables water molecules to spread evenly on the glass surface and completely infiltrate the glass. Through sunlight, the ultraviolet rays in the sunlight activate the nano materials in the coating on the glass surface to produce a photocatalytic reaction. The nano materials decompose the organics adsorbed to the glass surface due to pollution, decompose into water and carbon dioxide, and carry away the pollution attached to the glass through the gravity of water, so as to achieve a self-cleaning effect

its super hydrophilicity can prevent the formation of water droplets on the glass surface after rain, absorb the floating dust in the air and form stubborn water marks. Compared with ordinary glass, rainwater can quickly "dry" without leaving "spots" after falling onto nano self-cleaning glass. At the same time, the uniform water film formed by rainwater falling on the glass can easily send away the dirt on the surface

Zhang Heng, chief engineer of Beijing zhongkesina Glass Technology Co., Ltd., told us, "Beijing's sandstorm and dry climate make it impossible to completely rely on rainwater for self-cleaning." However, the self-cleaning glass can be installed with an automatic spraying device with better mobility. PVC pipes are installed in the glass room for automatic flushing

subsequently, Wukesong Gymnasium, a Beijing Olympic project with a total area of 50000 square meters and an outer surface composed entirely of glass curtain walls, also adopted nano glass

because of the hydrophilicity of nano glass, 7. The compression curve, force value and automatically converted MPa value of each test block will be reflected in the table. Water in the air cannot form droplets on the glass surface, so the glass surface will not fog. This feature has just been applied to the new tower of terminal 3 of capital airport. In order to prevent glass fog from affecting navigation, all the peripheral glass of the tower are made of self-cleaning glass

combined with industrialization

in addition to the cleaning function, the nano coating has the characteristics of decomposing organic matter, which can kill bacteria and purify the air. According to the detection of the Institute of physics and chemistry of the Chinese Academy of Sciences, the self-cleaning nano film has a strong decomposition effect on organic matter under the sunlight and ultraviolet radiation, and has the functions of sterilization and mildew prevention, formaldehyde removal, odor removal, deodorization, and air environment control. At the same time, it is wear-resistant and weather resistant. According to the test report issued by the national building materials testing center, the glass membrane surface can withstand the erosion of general acid rain and alkaline substances. This property can also avoid the erosion of acid rain and alkali on the glass

the biggest advantage of the industrialization of self-cleaning glass developed by Seine Glass Technology Co., Ltd. is that it can be produced offline. Zhang Heng said that the investment in establishing a new flat glass production line is at least tens of millions of yuan. The research results of the Chinese Academy of Sciences can make this nano coating be sprayed on various glasses offline under normal temperature and pressure, including Low-E glass and hollow glass, which are widely used now, and can be sprayed on all levels of Low-E glass according to user requirements

now, senna Glass Technology Co., Ltd. takes Beijing as an example and selects Yaohua Glass and new Jackie Chan as production bases for market promotion. At present, the selling price of nano self-cleaning glass is about 70-80 yuan per square meter, 30-50 yuan per square meter higher than that of ordinary glass. However, the import of similar foreign products to China is as high as 260 yuan. Zhang Heng explained that the main reason is that the off-line production of nano glass abroad can not be realized, and the original glass chips must be imported from abroad, which leads to a rise in prices

now, with the development of energy-saving market, all glass enterprises cooperating with Sena have been promoted in common commercial projects. The Sheraton Changchun Hotel and Beijing Kaichen plaza have adopted nano self-cleaning glass

the installation process is the bottleneck

although the nano glass of the National Grand Theater has a self-cleaning effect, the periphery was still manually cleaned before the opening of the two sessions. Zhang Heng frankly said that the self-cleaning effect of the National Grand Theater did not reach the effect of the experiment. Although the nano film has a certain hardness, it will be damaged by strong scratching. After completion, some construction personnel threw a large amount of waste materials from the glass surface, resulting in scratches on the membrane. When silica gel is used for installing glass, the chemical materials on its surface are damaged due to improper methods

nano glass mainly relies on optical reaction to produce chemical reaction with nano film. In principle, with the continuous occurrence of chemical reaction, its nano materials will continue to decrease. For this reason, senna glass has conducted a 10-year simulation of relative strength, and the simulation results have proved that there will be no substantial change. However, Zhang Heng frankly said that it is still uncertain how many years it can be used in 10 years

now, another innovation is under way. In order to meet the energy-saving transformation needs of more existing buildings, Zhang Heng and his colleagues are studying how to spray nano films on the installed glass

at the same time, Zhang Heng said that nano films are not only applied to glass. In the next step, aluminum plate, marble and other building materials will become self-cleaning materials. Now, the Committee of Chairman Mao Memorial Hall has allocated a special fund for the Chinese Academy of Sciences to research and develop the use of nano materials on white marble

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