Curtain wall adhesive is an indispensable material for construction projects, and it is used in the curtain wall structure of the whole building, which can be called the “invisible merit”. Curtain wall adhesive has high strength, peel resistance, impact resistance, easy construction process, and is widely used in construction and installation, decoration, sealing, structural bonding and other fields. The development direction of modern architecture will be design (standardization, construction mechanization, prefabrication of components and light weight, high strength and multi-functional building materials). And the curtain wall project adhesive is widely used, will accelerate the process of this four, and in improving the construction speed, beautify the building, improve the quality of construction, save time and energy, reduce pollution and many other aspects have important significance, so the curtain wall adhesive has become one of the important chemical building materials. What are the common problems encountered in the construction of curtain wall engineering adhesive which plays a key role? How do we deal with them?
1.high strength structural adhesive in what case need expert evidence?
In the glass curtain wall with structural silicone sealant super specification design, curtain wall projects need to use junbond brand ultra-high performance structural silicone sealant to improve the f1 value (structural silicone sealant strength design value under wind load or earthquake), f2 value (structural silicone sealant strength design value under permanent load), δ value (structural silicone sealant displacement bearing capacity, to solve the design process The structural silicone sealant design width or thickness encountered exceeds the specification value. The feasibility of this super specification design, the need for a direction to the project is located in the province of housing and urban-rural construction department to apply, the housing and urban-rural construction department to arrange time to appoint a group of experts, for expert verification.
2.What will be the effect of long-term soaking of structural adhesive and weatherproof adhesive? About how long will affect the performance of soaking?
Structural and weathering adhesives are silicone sealants (due to the molecular structure of silicone sealants themselves, long-term soaking water, some chemical bonds will be hydrolyzed and broken, the bonding failure. In GB16776 “building silicone structural sealant” standard, silicone structural sealant cured need to do bonding test, soak test 14 days, still good bonding. In the American standard ASTM 1184, structural sealant needs to be tested by water UV for 5000 hours, junbond brand structural adhesive can pass the test without problems. However, depending on the design of different formulations of silicone adhesives, probably soak in water for several months to several years, it will affect the performance. In actual engineering cases, silicone sealant is not suitable for long-term soaking in the environment, such as aquariums and other underwater joints sealing.
3.Can the structural adhesive of the unit glass play a waterproof sealing role?
The structural adhesive of unit glass can play a certain waterproof sealing role. However, the design of the curtain wall, can not meet the waterproof sealing requirements, or need to rely on external weather sealant to meet the sealing requirements, and structural adhesive long-term immersion in water will also affect its bonding, reducing the safety of the curtain wall. If the structural adhesive is used as a weather sealant, its displacement capacity may not be able to meet the requirements of the curtain wall seam displacement, sealing durability is not as good as the specialized weather sealant.
Post time: Jun-02-2022