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The hollow glass industry develops rapidly. However, due to the lack of basic theories of insulating glass in the country, and the fact that some material suppliers exaggerate their publicity out of interest, the actual service life of many insulating glass materials fails to reach the time limit mentioned in the propaganda. Now. Some curtain walls have failed only 10 years after they were built, resulting in a possible security incident in the hidden curtain wall. This not only failed to achieve the purpose of energy efficiency, but also increased the social costs. This article describes several simple ways to identify the advantages and disadvantages of hollow glass, for reference.
Any piece of insulating glass is drawn from the finished product and any of the following phenomena are found. Consumers can determine that it is a non-conforming product and request a return.
1. Use a knife to cut the two seals into one cross section. If there are many small air holes (small cells) in the cross section, this indicates two possibilities. One is hand-gluing and it will be trapped in air and generate air bubbles; another may be used. The secondary sealant produced by low-level technology can also use the machine to inject glue to produce air holes, so long as the air holes in the cross-section appear to have short life.
2. Use a spatula to cut open at any connecting corner of the insulating glass to see if the connecting corner is wrapped with butyl rubber. The actual theory shows. The double-sealed insulating glass made by the connection angle method has a water permeable path mainly in four corners, the water permeability rate is 70%, and the edge water permeability rate accounts for 30%. Therefore, as far as possible, continuous bending aluminum strip or butyl rubber is used to effectively wrap the four connection angles, which can greatly extend the service life of the insulating glass. If no butyl rubber is used to effectively wrap the four corners, double-sealing The actual significance is not great.
3. Use a knife to cut the two sections of the two seals and glass joints a few centimeters, and then manually tear the sealant away. If the surface of the glass after tearing is relatively smooth and there is no residual glue, indicating that there is no adhesive force between the sealant and the glass surface, then the sealing effect can be imagined.
4. Supplement the above methods to see whether the standard molecular sieve is used and whether the butyl rubber is continuous (without broken wires). If it is not polysulfide rubber, whether the other two sealants have been tested for compatibility (must be compatible). Experiments, otherwise it is very likely that there will be endless trouble.) If the window Frame seal is not a standard rubber seal, but it is sealed with ordinary silicone rubber, be sure to use the silicone rubber and the insulating glass edge sealant as an intermiscible experiment. Otherwise, there may be endless problems (some doors and windows are installed) The company purchased the poorly oil-filled silicone sealant to seal the window frame. Over time, the mineral oil migrated out and eroded the entire insulating glass sealing system. Since it takes some time for this evil effect to manifest, it must be prevented in advance.)
Hollow glass quality control approach
Although the basic theory of insulating glass in domestic systems is not perfect at present, in recent years, the rapid development of domestic insulating glass, various types of hollow glass production equipment have been widely used in production practice. At the same time, we have accumulated many positive and negative practical experiences in the history of the development of insulating glass in the past 20 years. The author now summarizes the following ways of quality control.
1. A better process is an effective way to improve the quality of hollow glass. For the hollow glass industry, a good production process must meet the following requirements. First, in a continuous production line, only a continuous production line can ensure that the insulating glass products go from the original glass sheet to the qualified finished product, and the consistency of quality is in order to maximize the production efficiency. Second, whether it is the first Road sealing is also the second sealing equipment, and it should be possible to use highly automated sealing equipment. Only in this way can the impact of human factors on quality be minimized.
2. To improve the production environment of insulating glass, hollow glass must be produced in a dust-free, solvent-free, and temperature-constrained environment. Dust contamination in the production workshop will have a significant adverse effect on the bonding of the various components of the insulating glass seal system. It is conceivable that the sealing performance and the functional life of an insulating glass product with poor effect. Due to the presence of the solvent, the butyl rubber (PIB) loses its adhesive force and the first seal fails. Therefore, do not use volatile substances in the workshop and keep the air open. The suitable temperature is a necessary condition for effective sealing of the secondary seal. The temperature of the secondary sealant should be guaranteed to be at least 10°C. Only the proper temperature can make the sealant reach the use effect within the specified time, for example, the initial viscosity. Relay, shear strength, elastic modulus, sealing performance, etc.
3. With excellent equipment, a good production environment, no good management, and always can not do the quality and stability of the insulating glass. The special nature of hollow glass production determines the following aspects of management work is particularly important. 1 Aluminium rods are connected by a gusset type, check whether the four connection angles are effectively sealed with butyl rubber (PIB); 2 if the molecular sieve filling exceeds the 40 minutes specified in the regulations, the second sealant is encapsulated; 3 the need for edging Whether the coated glass reaches the edging requirements; whether the width and thickness of the 4 butyl rubber (PIB) and the secondary sealant meet the values ​​specified in the relevant standards; 5 if the silicone sealant has been used for compatibility test (based on the hollow Glass sealant industry standard JC486, two sealant with silicone adhesive, compatibility test should be carried out).
4. The selection of qualified supporting materials is a necessary and sufficient condition for the production of qualified insulating glass. Without qualified supporting materials, it is impossible to produce high-performance hollow glass products. Therefore, material selection is a key link. According to the current domestic production status of insulating glass, double channel sealing is the mainstream production process, and other processes are in a supplementary position. Therefore, the quality of various components that constitute the double channel sealing process is the focus of discussion and constitutes the main component of the double channel sealing process. There are butyl rubber (PIB), polysulfide rubber, silicone rubber, aluminum strips, desiccants, connectors, etc., as a relatively mature and reliable butyl rubber + polysulfide glue formed by double-channel sealing process, due to energy saving The door and window industry has been successfully used for more than 25 years, so it has been recognized as the first choice for producing high-tightness hollow glass products.
With the continuous innovation and development of modern buildings, the emergence of glass curtain walls has imposed higher requirements on the double glass sealing process of insulating glass. The hollow glass of curtain walls must not only reflect the beauty, but also achieve energy-saving effect within the functional life. At the same time, it must also reflect the safety performance. Due to its excellent UV-resistance, shear strength and other properties, silicone adhesives make it the first choice for sealed glass hollow glass secondary sealing materials. In order to guarantee the functional life of the seal, the adhesive layer thickness should be listed as the main designer. Considering the content, this is mainly because although the silicone adhesive has excellent aging resistance, its airtightness is relatively insufficient, and in particular, once the produced insulating glass enters with water vapor, the functional life of the insulating glass will be immediately terminated.
The condensed water in the interior of the hollow glass will have a fatal effect on the entire hollow glass member, which in turn will lead to the generation of non-safety factors, and thus increase the social cost. Therefore, the proper thickness of the adhesive layer is designed to extend the function of the sealant. Lifetime is the best choice to ensure both the safety of the insulating glass of the curtain wall and its functional life. Performing compatibility experiments on various sealing materials, adopting bendable aluminum strips as much as possible and molecular sieves with suitable adsorption rates are also effective ways to control the quality of insulating glass and extend its functional life.
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