As the outer protective structure of the building, the building curtain wall is composed of a supporting structure system and panels. It can have a certain displacement relative to the main structure and does not share the outer protective structure or decorative structure of the main structure. And because of the different materials of the outer protective panel, it can be divided into building curtain walls of glass, stone, metal, etc., or a combination of different materials. On the basis of the building curtain wall as the outer protection function of the building, it can show a strong sense of modern rhythm and artistic decoration effect, giving the building a breath of the times, and is widely favored by architects.
Sealing materials refer to materials that can withstand the displacement of the joints to achieve air-tight and water-tight purposes and are embedded in the joints of the building. As a functional material for building curtain walls, building sealant has the functions of building sealing, waterproofing, sound insulation, energy saving, anti-corrosion, anti-pollution, fire prevention, decoration, structural elastic connection, structural safety, and durability. The functional requirements of building sealants mainly depend on environmental factors such as UV radiation aging in the sunlight, oxidation of oxygen and ozone, aging of water and water vapor, the influence of environmental temperature changes, wind load, shear force, and circulation Mechanical (compression/tension) load, invasive air pollution (such as acid rain, salt spray, etc.), the influence of microorganisms and large organisms (fungi, etc.). After understanding the environmental factors, consider the needs of building joints. Due to its special molecular structure, silicone sealant has the characteristics of both inorganic and organic polymers. The original rubber of silicone rubber is a polymer with Si-O as the main chain. Its bond energy is 106 Kcal/mol, while the C-O and C-C bond energies of common polymer materials are both small, 80 and 85.2 Kcal/mol, respectively. In other words, if the Si-O chemical bond is broken, higher energy is necessary, so the silicone glue is stable. It has excellent UV resistance, ozone resistance, weathering resistance, temperature resistance, and single-component and two-component applications in multiple forms. At the same time, products with different performance requirements can be manufactured according to the needs of the building, especially in building curtain walls. In the application of structural bonding of hidden frame glass curtain walls, other materials are irreplaceable. In addition, the development of the raw material industry in the production of silicone sealants in my country is larger and more mature than polysulfide and polyurethane. At present, silicone construction sealants account for more than 60% of the use of construction sealants in my country. Modified silicone products abroad are also widely used in construction. At present, our country is limited to other fields.
After the building joints and building, sealant are determined and the characteristics of the sealant product are understood, the successful sealing of the building curtain wall sealant depends entirely on the strict and correct construction of the sealant. Construction not only requires correct and proficient operating skills, but also must be responsible and patience to avoid defects. A large number of facts show that joint construction defects and inadvertent sealing construction are important reasons for infiltration. Moreover, it is very difficult to find the source of leakage and restore the seal, which is time-consuming, labor-intensive, and unnecessary costs. Careless construction of silicone structural sealant for hidden frame glass curtain walls will also cause safety hazards. It is very necessary to formulate strict construction procedures for both structural sealants and weather-resistant sealants.
The application of building sealant accounts for a small proportion of capital investment in construction projects, but it is of great importance to the waterproofing and sealing of the main building body, and ultimately achieving structural safety and durability, especially for the application of silicone structural sealants. This article focuses on the characteristics and construction procedures of sealants used in building curtain walls. In fact, the correct joint design of the building sealant, the reasonable choice of sealant, and the successful joint sealing construction are the complete quality chain to complete the effective sealing of the building joints. It is also the common design of the designer, the material supplier and the construction party. responsibility.
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