From the perspective of foreign glass development,

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From the perspective of foreign glass development, China's vacuum glass market has a huge prospect

driven by the global energy-saving and emission reduction policies, low-E coating technology has developed rapidly since the 1970s. At present, low-E coating can be mass produced, and the emissivity is about 0. 15 Low-E glass, stable performance, not susceptible to moisture deterioration. Offline low-E coating has been able to produce emissivity of 0. 03 tempered Low-E glass. In the past, the stability of such Low-E glass was very poor, so it should not be tempered or hollow should be synthesized as soon as possible after tempering, otherwise it will oxidize and deteriorate. Now, it is said that it can be stored for several months under certain conditions, which is a great progress in technology. Now, PPG, guardian, Jinjing and other companies have reached the same level of low-e coating technology, and have developed high-permeability and sunshade products. More importantly, the cost of Low-E glass is also decreasing. In this way, the technological progress of Low-E glass has created conditions for the quality improvement of insulating glass and vacuum glass

the European Union has always been in the leading position in the world in energy saving of glass doors and windows. As early as 1995, Germany has legislated to promote Low-E insulating glass. At present, the U value is about 1 in promotion. Based on the single Low-E hollow of 1w/m2 · K, the U value is about 0. 7w/m2 · K double Low-E double insulating glass. At this international glass exhibition, all major glass manufacturers exhibited such products, and factories in Germany and Austria are producing this kind of double Low-E double insulating glass, which shows that the market demand for it is still considerable

according to several German experts, the contradiction between the desire to further reduce the U value and the fact that the glass is too thick and heavy has become a difficult problem for many experts and real estate developers. Many people are thinking about how to change next

compared with insulating glass, vacuum glass has obvious advantages of low U value and thin thickness. For example, use the aforementioned emissivity 0. 03 Low-E glass, it is not difficult to produce a U value of about 0. 31w/m2 · K single Low-E vacuum glass and U value 0. The double Low-E vacuum glass of 25w/m2 · K is not only much thinner than the hollow glass, but also the Low-E membrane can automatically turn over in the vacuum environment, which can be fully protected from oxidation failure, which is an important reason for attracting scientists to study vacuum glass

after leading the sub energy crisis in the 1970s, western countries set off an upsurge of research and development of energy-saving glass. In addition to Low-E glass and associated insulating glass, the Colorado Solar Energy Research Institute and the University of Sydney have successively developed vacuum glass. The latter industrialized its patent in Japan's Nippon saltpeter subsidiary (NSG) in 1997, and successively established production lines with an annual output of 100000 square meters and 500000 square meters. But how to detect the soft impact of the security door? Generally speaking, over the past 10 years, foreign countries have made no significant achievements in vacuum glass technology and commerce, and relevant international research and development has also been at a low tide, but China has caught up in the research and development of vacuum glass

countries all over the world pay attention to the research and development of vacuum glass again. Guardian company of the United States has resumed the research and development of vacuum glass for many years in recent years, hoping to open the vacuum glass market with its advantages combined with low-E coating technology and its market advantages; Many countries in Europe are stepping up research and development. At this international glass exhibition, the University of Stuttgart and BBG company in Germany exhibited a U value of 0. 6w/m2 · K vacuum glass samples and production line flow chart; Czech Republic, Taiwan, China and other companies also exhibited samples. South Korean lghansys company has established a pilot production line and announced the sale of vacuum glass in August 2010. Korean companies eagon and hanwhal C also announced that they would sell their own vacuum glass in 2011. Whether in China or abroad, many R & D units are working hard and hope to make breakthroughs in this field

"everyone gathers firewood and the flame is high". It is hoped that the new round of research and development boom will bring new breakthroughs in vacuum glass technology and a new leap in industrialization, so that vacuum glass can benefit mankind and make scientists' dreams come true

at present, the mainstream products of energy-saving glass also pay attention to the beam zigzag experiment, the use of extensometer for experiment and the maintenance of equipment. Of course, enough free area should be reserved around the experimental machine. Of course, it is Low-E insulating glass. Our country should improve the energy-saving standard of doors and windows, increase the promotion of Low-E insulating glass, and strictly control the product quality at the same time. In severe cold areas, Low-E double insulating glass with U value less than 1w/m2 · K should be gradually promoted

low-e hollow and vacuum glass are basically the expansion of the principle of vacuum thermos bottles. Researchers should explore new ideas and new directions of energy-saving doors and windows in the future from different physical principles. The vacuum silica aerogel gel window developed in recent years can reach the low U value level equivalent to vacuum glass without Low-E film and support in vacuum glass. Although there are still some problems in light transmittance and cost, this direction is worth exploring. In addition, the research of transparent photovoltaic glass is also a new development direction. If there is a breakthrough, the variable passive energy-saving window is the active energy-saving window

mankind is always advancing in continuous exploration and innovation. China's building materials researchers must be brave in innovation while constantly absorbing foreign new achievements, so that China's building materials industry can become the forefront of the world and make China's glass industry bigger and stronger

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