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　　People may have noticed that the glass used in China's building doors and windows is undergoing a development process from ordinary white glass - deeper color heat absorbing glass (commonly known as tinted glass) - light green heat absorbing glass and coated glass - light green insulating glass. Due to the low cost and light insulation performance of light green glass, it is being used in a large number of ordinary residential doors and windows, and the insulating glass is gradually used in new high-end luxury doors and windows due to its good sound insulation performance. Its expensive price also restricts popularization. Moreover, all of the above glasses have the most fatal weakness of ordinary glass, that is, brittle and brittle, that is, the safety performance of the glass is low.
　　How can buildings adopt effective, economical and convenient methods to solve the heat insulation and energy efficiency of building glass doors and windows and improve their safety performance?
　　Multifunctional glass film is a high-tech energy-saving product that can effectively control solar heat radiation and increase glass strength. It belongs to a new type of energy-saving building materials.
　　The film is made of a special polyester film as a substrate, and is coated with various high-reflectivity metal or metal oxide coatings by magnetron sputtering in the middle of the polyester film, and then subjected to a special process composite layer. A functional glass film that is pressed and has high light transmission and high heat insulation. It can transform inexpensive ordinary transparent flat glass into a safe insulating glass with multiple colors and multiple functions.
　　For example, it can be directly applied to ordinary transparent glass to become a heat-insulating glass that is formed like a coated glass to form a plurality of colors and functions. For example, the film can be directly applied to ordinary transparent glass to become a heat-insulating glass like a film glass, and the ordinary transparent glass can be turned into a safety heat-insulating glass which has both heat insulation and safety explosion-proof function. A colored or colorless transparent safety film can also be applied to the curtain wall glass, so that the coating layer of the coated glass is not easily oxidized, faded and peeled off, and the ability to resist wind pressure and acid and alkali corrosion is increased.
　　According to the test, the 12mm ordinary glass is attached with two layers of safety bulletproof film, which can prevent the shooting of the 79 micro submachine gun without penetrating and no spatter, which shows its reliable impact resistance. The safety glass made of ordinary glass and safety film has reliable safety performance and low price and can greatly reduce the weight of the glass. Explosion-proof glass is made by attaching a special safety film to ordinary glass of a certain thickness, which can effectively resist the shock wave generated by the explosion in the event of an explosion, reduce the damage caused by direct damage and splashing of glass fragments, and also reduce the bombing. Repair costs for facilities and facilities near the explosion center.
　　According to tests conducted by some domestic research departments, ordinary 6mm transparent glass can make 84% of solar radiation penetrate into the room. In some cities and regions in western China, the radiation of the summer sun entering the room is about 1.676 × 106J/m2 · h . When a layer of thermal insulation film is applied on a common transparent glass with a thickness of 3 mm , the solar radiation can be radiated. The transmission is reduced to 82.5% , so that the thermal radiation flow entering the room from the window glass in summer decreases from 1.676 × 106 J/m2 · h to 0.239 × 106 J/m 2 · h . Comparing the heat transfer coefficient of the window, the heat transfer coefficient k of the single-layer window is 5.24w/m2 · k , and the heat-insulating film is attached to the inner surface of the ordinary glass of the single-layer window with a heat transfer coefficient of 3.93w/m2 . k , and the film is adhered to the outer side of the inner layer of the double-glazed ordinary glass, and the heat transfer coefficient thereof can reach 2.04 w/m 2 · k . Under the basic conditions, the comparison test of the two air-conditioned rooms as the total power consumption for 30 days, when the windows of the two rooms are the same, the building area of the room with the insulation film is 13.76m2 , and the power consumption is 563.35. Kw / h , while the control room ( unfilmed ) room construction area is 14.78m2 , power consumption is 649.35kw / h , the filmed room power saving 13.24% . It can be seen that the heat insulation and energy saving effect after the thermal insulation film is attached to the building door and window glass is very obvious. If the heat insulation film is attached to the outer side of the second glass of the single-frame double glass plastic steel window, the heat insulation effect is More significant.