Learn about insulating glass sealants
Publisher: Oriental Rubber Industry Time：2022-3-1 17:42:55 hot:
1. What is insulating glass sealant?
Insulating glass glue can be divided into two categories: thermoplastic and thermosetting. The insulating glass adhesives belonging to the thermoplastic category include hot-melt butyl adhesive, polyisobutylene adhesive and comfortable adhesive strip. The insulating glass adhesives belonging to the thermosetting category include silicone adhesives, polyurethane adhesives and polysulfide adhesives. In general, thermoplastics are mostly used for the first seal, while thermosetting adhesives are mostly used for the second seal, that is, structural sealing.
The sealing and structural stability of the insulating glass system is achieved by insulating glass glue. Insulating glass is always faced with the influence of external water vapor penetration and temperature changes during its life, so it is required that insulating glass glue must be able to prevent external water vapor from entering the air layer of insulating glass. After the insulating glass is installed, it is often affected by external forces such as temperature difference, air pressure, and wind load from the outside world. Therefore, the insulating glass adhesive is required to ensure the structural stability of the system. Obviously, it is equally important to ensure the sealing of the insulating glass air layer and to maintain the structural stability of the insulating glass system. The tightness of insulating glass depends on the integrity of the structure, and the structure ensures the stability of the tightness.
The insulating glass system must be double-sealed. The first sealant is used to prevent the invasion of water vapor, and the second sealant is used to maintain the stability of the structure. If the insulating glass system only uses a single seal, the insulating glass adhesive must not only play a sealing role but also play a structural role, but no glue can have excellent sealing and structural properties at the same time. Therefore, the result of single-pass sealing can only greatly reduce the sealing life of insulating glass.
2. How to choose insulating glass sealant
In a nutshell, when choosing insulating glass glue, you should comprehensively consider the performance of the glue, the convenience of using the glue, and the impact of the glue on human health, safety and the environment.
Specifically, the following factors should be considered:
(1) Compatibility of glue and glass; (2) Modulus of glue; (3) Is it easy to process; (4) Water vapor transmission rate; (5) Bonding strength to glass and spacer; (6) Intrinsic strength ; (7) Anti-ultraviolet ability; (8) Holding ability to inert gas; (9) Compatibility with plated glass; (10) The glue shrinkage process is harmless to the environment and users.
Construction quality management of insulating glass glue
All aspects of insulating glass production will directly or indirectly affect the construction quality of insulating glass glue, which in turn affects the sealing life of insulating glass. The entire production process includes glass cutting and cleaning, spacer cutting and cleaning, desiccant selection and filling, spacer loading, lamination and gluing.
