Doors and windows are one of the important building envelope structures, which have the functions of shelter from wind and rain, heat insulation and sound insulation, lighting and ventilation, and play an important role in people's work and living environment. It is said that it is the eye of the building, is one of the key parts of beautifying the interior and exterior buildings. Therefore, it will be the direction of struggle in the future to make our doors and windows of high quality. Aluminum alloy doors and windows have the characteristics of good performance, light weight, beautiful (with metal luster, can be processed into various shapes and colors), good lighting (small frame), durable (non aging, atmospheric corrosion resistance), easy recovery and reuse of profiles, no environmental pollution and other characteristics. However, the poor thermal insulation performance of its frame material affects the performance of aluminum doors and windows. Therefore, improving its thermal insulation and energy-saving performance is the key technical problem to be solved in the future, and it is also the development direction of door and window enterprises.
1. Improve the structure and realize the diversified system design
In order to improve the performance and grade of existing doors and windows, it is necessary to improve the structural design, change the low-level structure which only pursues labor-saving, material saving and low-cost in the past, realizes the transition from mainly push-pull window to better performance casement window, and realizes the diversified system design of single-layer, double-layer, three-layer and small opening and large-scale fixation.
2. Key development areas of raw materials
① The general requirements of frame materials should be good strength, good heat insulation performance, easy to make into various shapes, easy to recycle and conducive to environmental protection. In order to improve the thermal insulation performance of aluminum alloy window frame, it is better to make the broken bridge or composite type.
② Insulating glass should be widely used in glass, and Low-E (low radiation) insulating glass should be popularized in the north. In the south of China, the use of solar coated glass should be promoted. Single glass and white glass are no longer used in developed countries because they are not conducive to energy conservation and improvement of living environment.
③ Double seal and insulating glass made of polysulfide insulating glass glue should be popularized. The insulating glass spacer should be of continuous curved angle structure. If the four corner plug-in type is used, butyl rubber must be used for sealing treatment at the joint. Single seal insulating glass is not available, and silicone structural adhesive used as secondary sealing insulating glass is not recommended, because their service life is relatively short.
④ In addition, the so-called double glass is not available. In order to reduce the heat transfer coefficient and reduce the price of some window types, double glass is used, that is, the two-layer glass is separated or the ordinary sealing glue is used to install on the window. The molecular sieve is not used to absorb the moisture, but only a single seal is used. General sealant is not resistant to aging, not for long, will enter dust, and can not be wiped, affecting the line of sight, very unsightly. Even if the insulating glass made of polysulfide insulating glass glue is used, the sealing life will be only five years if only single seal is used, which is not allowed to be used in the specification of glass curtain wall. Moreover, the service life of ordinary sealant is shorter. One of the most critical aspects of construction engineering is the service life, that is, durability. It is only a temporary and expedient measure to use this kind of double glass, which is very undesirable.
⑤ Moreover, it is not advisable to use 5mm thick glass on the doors and windows of buildings. Because 5mm thick glass is used in the window with large partition area, safety is also a worrying problem. If you want to use it, it should also be used after strength calculation under the premise of ensuring safety, and must not be used indiscriminately. All kinds of accessories are durable, easy to use and beautiful. Accessories have an important impact on the performance of doors and windows, but also play an important role in decoration, so it can not be ignored.