With the implementation of domestic epidemic prevention and control measures, the epidemic situation in most parts of the country has been well controlled, domestic enterprises have also ushered in a large area of resumption of work, and the resumption of work in the construction industry has also followed. Silicone sealant, as one of the key materials of building waterproof seal, is widely used in building waterproof seal. How to choose and use sealant after the construction unit returns to work? Today, Xiaobian will talk about this matter and guide customers to start the first "gun" after the epidemic!
01. How to choose building sealant correctly?
Generally speaking, most of the silicone sealant materials are named according to different application parts, such as silicone structural sealant for curtain wall, silicone weather resistant sealant for curtain wall, silicone sealant for stone, silicone sealant for daylighting roof, silicone sealant for concrete plate joint, silicone sealant for doors and windows, silicone sealant for hollow glass, etc. The following focuses on how to select different silicone sealant according to different application parts.
1.1 curtain wall structure assembly
Building curtain wall usually consists of panel and supporting structure of curtain wall. In the curtain wall design of buildings with various curtain walls as external enclosure, silicone structural sealant must be used for flexible connection according to JGJ 102-2003 technical code for glass curtain wall engineering. The silicone structural sealant on this part must meet the national compulsory standard GB 16776-2005 silicone structural sealant for building, which needs to bear a variety of loads and ensure the long-term adhesion to the curtain wall panel, so as to avoid the risk of falling off of the curtain wall panel due to the problem of structural adhesive. Therefore, silicone structural sealant itself needs high strength, good toughness, which can ensure good mechanical properties and meet the requirements of design service life under the harsh conditions of high and low temperature, immersion and UV irradiation.
1.2 curtain wall joint sealing
The joints between curtain wall panels need silicone sealant for sealing. This type of sealant is called silicone weather resistant sealant. Although the weatherproof sealant for joint sealing does not need to bear all kinds of loads of curtain wall panel, it needs to bear the displacement caused by the deformation of the base material caused by the thermal expansion and cold contraction of the wind load with the change of temperature. It not only needs the sealant to have certain mechanical properties and bonding properties, but also needs the weatherproof sealant to have better displacement capacity. Silicone weatherproof sealant shall be classified into 20hm / LM, 25hm / LM, 35hm / LM and 50hm / LM according to GB / T 14683-2017 silicone and modified silicone building sealant. It is recommended to use 35 grade products for joint sealing of common glass curtain walls and aluminum panel curtain walls. In addition to the conventional types of curtain wall panels, stone special sealant is required for stone curtain wall panels to prevent curtain wall pollution; due to its special requirements, special sealant is required for daylighting roof joint sealing.
1.3 secondary sealing of hollow glass
Generally speaking, the following points should be considered in the selection of the second sealant for hollow glass: (1) the sealing performance of the edge; (2) the protection provided for the whole glass system; (3) the environment exposed by the second sealant during the use. In practical application, people will choose different sealant according to different application range. Silicone structural sealant is generally preferred for commercial building glass (glass curtain wall, structural glass, etc.), and silicone sealant or other types of sealant can be used for the sealing of hollow glass of doors and windows.
1.4 door and window assembly and joint sealing
The weatherproof and waterproof seal of doors and windows is a systematic project like curtain wall, including the seal between window frame and glass, the seal between outer wall and door frame and window frame, etc. The quality of silicone sealant is the direct influence factor of whether the energy-saving door and window system can play a role, and the high-quality silicone sealant products can maintain long-term adhesion, air tightness and water tightness in the service life, so as to ensure the energy conservation and environmental protection of green buildings.
02. How to use silicone sealant correctly?
Silicone sealant industry has such a sentence "three materials, seven construction", the choice of materials is important, but the correct use also directly determines the waterproof effect of construction joints. Each type of sealant has different construction process, so it is necessary to strictly construct according to different construction process to ensure the sealant construction effect.
According to the curing type of sealant, the sealant can be divided into single component and two-component sealant. According to the different curing types, the construction shall be carried out in different ways. Before the construction of single component sealant, relevant bonding test, compatibility test, surface dry test, etc. shall be carried out, and then relevant gluing steps shall be carried out. The two-component sealant needs to ensure the uniformity of a and B components before construction, so as to ensure the bonding effect. The methods for testing the mixing uniformity include butterfly test, pull-off test, bonding test, etc., and then the gluing process.
03. Conclusion
The selection of glue and construction procedure of building system determine the use effect of the whole building, and the selection of sealant with quality and reputation guarantee is very important. Sibao technology has been established for more than 20 years. It not only has a full range of silicone products used in the construction industry, but also provides a full range of "one-stop service", which can provide customers with relevant detection methods and assist in relevant tests, so as to ensure the use effect of curtain wall engineering. Use good glue, choose silica!
Source: Chengdu Sibao Technology Co., Ltd
　
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