In normal environment, there are two factors that affect the life of aluminum alloy doors and windows, namely, humid atmosphere and low temperature.
Continuous moist atmosphere can cause mildew of glass, but under normal temperature environment, the rate of mildew of glass is extremely slow, which is usually necessary for several months, in the abnormal application environment, there are few wet atmosphere for several months, and the glass exposure in the atmosphere will not cause mildew. As usual, the mildew of glass occurs during the storage process of glass stacking. It is relatively easy for Glass to cause mildew in the wet stack or air storage in the rain. As usual, the sheet glass without tempering is more moldy than the tempered glass.
1. Life of tempered glass
Physical tempering is to heat the glass and then cool it. What changes is the layout between the external elements and the elements of the glass; Chemical tempering is to stop ion exchange when the layout of the elements outside the glass is at low temperature; these two methods are to change the macro layout of glass data forever. Unless there is a low level and strong chemical effect, the characteristics of tempering in abnormal application environment will not follow the change of time and produce attenuation or change.
2. Life of hollow glass
Hollow glass is a combination of glass substrate, distance frame (aluminum strip), boring agent (molecular sieve), sealing material (butyl rubber, polysulfide glue or layout glue). In the composition of hollow glass, glass and aluminum frame are extremely stable on weekdays, and the life of hollow glass depends on the life of molecular sieve and sealing data.
In the composition of hollow glass system, the glass is extremely stable, and the glass substrate does not need to consider the aging performance under the environment of abnormal application; aluminum strip of the scale hollow protection is handled by Yang polarization outside the end of the mountain. The physical and chemical functions of the aluminum strip outside anodized treatment are extremely stable in the conventional environment. Even if there is no aluminum strip of Yang polarization treatment outside, oxidation generated during the application process will only make aluminum strip lose light, but this has no great influence on aluminum strip's own functions.
The cost of constructing hollow glass system lies in that hollow glass can play a role in heat insulation and anacoustic under the condition of closed and boring cavity. Due to the change of ambient temperature, the gas in the hollow cavity has been shrinking or tightening, which makes the hollow glass sealing system under stress all the time. At the same time, ultraviolet rays in the environment, the cities of water and moisture accelerate the aging of the sealing system, which leads to the acceleration of water vapor into the hollow cavity. When a large amount of water vapor appears in the hollow glass cavity, the hollow glass has already taken effect, and the effective effect of the hollow glass means that the service life of the hollow glass stops. To ensure that insulating glass does not take effect, the crux is boring agent and sealing material.
To deal with the life of hollow glass, the first glass enterprise in our country gave a 10-year warranty period with reference to the American standard. In the national standard GB/T11944-2012 of hollow glass, for the first time, reference agreement was put forward on the life of insulating glass, and the view that "the expected life of insulating glass should be greater than 15 years" was put forward. In fact, the service life of hollow glass is closely related to the selection and processing technology of hollow glass materials. At the same time, it is also affected by numerous identities such as hollow glass layout composition and application environment, which is difficult to be simply quantified. To deal with the insulating glass once installed on the wall, the relatively simple weighing method is to measure the dew point or the humidity of the atmosphere at the distance layer.
3.low-e glass life
Low-E the life of glass depends on the life of its hollow sealing system. We know that the important components of Low-E film are metals, alloys, metal oxide and metal nitride. Metal nitride is usually used as a protective layer in the film layout, and its function is extremely stable. Metal oxide and gold layer are usually used as the dielectric layer in the film layer to connect the silver layer and the protective layer, and their properties are relatively stable. The silver layer in Low-E is relatively lively, but its oxidation must have the existence of water vapor. Therefore, only the hollow glass does not take effect, and it does not need to consider the life performance of the Low-E film layer.
4. Service life of laminated glass
Laminated glass refers to a composite glass product that has one or more layers of inorganic polymer central film sandwiched between the glass and makes the glass and the central film always adhere to one after the final process is disposed. Laminated glass fragments will stick to the film even in the broken environment, which is useful to avoid fragments from being hurt and penetrating into falling accidents.
The service life of laminated glass depends on the material of the central interlayer. In terms of disorder, wet laminated glass and EVA laminated glass are important for indoor isolation, and are not suitable for building aluminum alloy doors and windows or curtain walls. Wet laminated glass will accelerate aging under sunlight, and will show signs of yellowing after 1-2 years, and will continue to show degumming bubbles, ice flowers and fog environment for 2-3 years. As usual, the aging rate of wet laminated glass is much faster than that of EVA laminated glass. EVA laminated glass avoids direct sunlight and can have a life of more than 10 years in indoor application.
PVB and SGP laminated glass, which are usually used as aluminum alloy doors and windows or curtain walls, have better aging resistance. The most typical effect of laminated glass PVB and SGP is unglue. Unglue means that the glass and the distance layer are disengaged, which leads to the safety characteristics of laminated glass. To deal with the service life of PVB and SGP laminated glass, there is no coherent scale and standard in the sea at present. At present, domestic glass processing enterprises usually refer to the relevant data of foreign PVB and SGP suppliers to give the product warranty period of 5-7 years.
