The failure form of curtain wall glass and the factors affecting its life

In recent years, the amount of glass curtain wall in our country has been greatly improved. With the increase of curtain wall usage, the quality of curtain wall engineering has attracted more and more attention. The aging resistance of curtain walls, that is, the service life of curtain walls, has aroused widespread concern in the industry.

According to the expert analysis, factors affecting the life of the curtain wall has the following several aspects: one is the life of the curtain wall structure, is the structure Aluminum Alloy profile failure or not, will directly affect the safety performance of curtain wall, many of the factors, such as strength design, Aluminum Alloy profile aging; two is the structure the bond part of life, mainly refers to the structural adhesive bonding between the component and the structure of the curtain wall failure, also affect the safety performance of the curtain wall; three is the life of the component single curtain wall, glass curtain wall uses unit mainly refers to the service life of the problem.

With the increasing demand for the diversification of architectural appearance, all kinds of integrated glass have also been widely applied to the curtain wall. But what followed was the premature failure of all kinds of glass, which caused various difficulties for users and construction units.

Glass curtain wall failure in a variety of forms, summed up in nothing more than the following: one is hollow glass dew water failure, effect of curtain wall engineering sight and thermal properties; two is the glass burst, including glass thermal cracking and tempered glass explode explode; three is coated glass film, resulting in loss of architectural beauty.

The typical failure of insulating glass products is the condensation and water inflow in the insulating interlayer of the insulating glass. Such products not only affect the appearance of the whole glass, but also affect the thermal performance of the whole glass. The reasons for this phenomenon include several aspects: first, the production of insulating glass selection of raw materials quality impact. The key factors affecting the service life of insulating glass are the aging resistance of the sealant and the adsorption capacity of the desiccant, and the decisive factor is the performance of the sealant. Because no matter how much the desiccant adsorption capacity, inside the hollow glass after a certain limit, when the hollow glass desiccant completely saturated, again good desiccant also unable to water vapor adsorption, then the hollow glass is invalid. When the sealing performance is good, low moisture permeability coefficient of sealant, the amount of water vapor into the hollow glass rarely, and keep this state, only rarely can guarantee the hollow glass desiccant inside gas drying, so as to ensure the effect of hollow glass. To keep the sealant unchanged for a long time, it must require the sealant has good anti-aging properties, if the material quality is not good, it will affect the life of hollow glass products, all can reflect the sealant, with butyl rubber as the basic raw materials of various types of sealants to moisture barrier properties, sealants, and so on standard hollow glass curtain wall curtain wall must adopt double sealing is a very correct decision.

Two is the processing of insulating glass production process, quality defects. The air through the sealant gap into the hollow glass, causing premature failure of hollow glass; hollow glass in order to avoid the premature failure phenomenon, should strictly control the hollow glass raw materials in the production process, focused on the choice of molecular sealing performance good water sealing adhesive and water absorption capacity of the sieve, strictly control the installation process of hollow glass, choosing appropriate sealant or adhesive sealing and bonding structure of hollow glass component or element.

The three is the installation quality of insulating glass and the influence of the use environment on the life of insulating glass. Hollow glass should avoid long-term mechanical stress during the installation process, the pad, sealant, sealant should be used correctly, the structure of bonding glue must be used to ensure structural adhesive bonding strength is enough. In the two glass interface location, it is necessary to use weathering sealant sealed to prevent water vapor and hollow glass or structural parts contact, to ensure that the insulating glass and structural parts have a long life. Proper selection of sealant or structural adhesive for sealing and bonding of insulating glass components or units.