With the rapid development of aluminum alloy doors and windows, its quality problems are increasingly prominent. The main problems focus on the quality of the profile itself, heat insulation strips, hardware accessories, and the strength and sealing of the corners of doors and windows. Today, we talk about the common problems in the corner strengthening and sealing of aluminum alloy doors and windows connected by corner codes.
At present, many people mistakenly believe that as long as the cutting accuracy of the cutting equipment is high, the corner code is properly matched, and the angle assembly unit is fixed, the corner strength and sealing of aluminum alloy doors and windows can meet the requirements. In fact, most of the aluminum alloy doors and windows connected by corner codes are produced by this process. This kind of simple mechanical fixed connection is a kind of rigid connection, which is difficult to adapt to the effect of various forces encountered in the production, transportation, installation and long-term use of doors and windows without being damaged.
First of all, it is necessary to understand the physical properties of aluminum alloy profiles.
There is the same temperature difference stress as any other aluminum alloy profile. Thermal stress refers to the stress caused by the change of temperature in a material, usually the coefficient of linear expansion / contraction.
Secondly, in the process of production and installation of aluminum alloy doors and windows, due to the moving error during transportation, transportation and installation, and after the installation of doors and windows, aluminum alloy doors and windows have to bear their own weight for a long time, bear the static stress error of window opening and building wall deformation, peak impact of opening and closing windows, wind pressure, environmental sound wave, and vibration effects of different frequencies It will induce the resonance of doors and windows, and affect the overall strength of doors and windows.
As the time goes by, the door and window gap will be seriously reduced. At present, there are more and more engineering disputes, which seriously affect the overall reputation and image of high-quality aluminum alloy doors and windows.
In fact, the corner strength and sealing of aluminum alloy doors and windows only need to use special aluminum alloy door and window group angle glue, but it is a pity that most door and window factories, developers, administrative departments and relevant architectural design and supervision units have not really realized the important role of special angle glue in improving the overall quality of doors and windows. Some of them do not use aluminum glue for door and window assembly. At present, there are three types of adhesives that are often used as corner glue in the market
1. Glass glue is also known as silicone sealant; it has poor adhesion to aluminum alloy, poor weather resistance, easy aging, low hardness, too large elasticity, and the colloid does not expand when curing, which can not make the corner code and mold cavity tightly bonded into one.
2. Structural adhesive to aluminum alloy bonding is poor, curing time is long, product has odor, curing does not expand, can not produce high strength.
3. After curing, the epoxy adhesive has no elasticity, can not adapt to the micro vibration of the window, and is easy to be crisped and broken. The long-term strength after angle combination is not enough, which will cause cracking and slag dropping.