Introduction of insulating glass sealant

The following factors should be considered for the performance analysis of sealant:
(1) The ability to prevent gas leakage; (2) The ability to resist water vapor penetration; (3) The ability to resist ultraviolet rays; (4) The ability to prevent water seepage; (5) The bonding system is structural.
The necessity of double sealing
The sealing and structural stability of the insulating glass system is achieved by insulating glass sealant. Insulating glass always faces the influence of external water vapor penetration and temperature changes during its life. Therefore, the sealant must first be able to prevent external water vapor from entering the air layer of the insulating glass. After insulating glass is installed, it is often affected by external forces such as temperature difference, air pressure, and wind load from the outside. Therefore, the sealant is required to ensure the structural stability of the system. Obviously, ensuring the sealing of the insulating glass air layer and maintaining the structural stability of the insulating glass system are equally important. The tightness depends on the integrity of the structure, and the structure guarantees the stability of the tightness.　Insulating glass system must adopt double sealing. The first sealant is used to prevent water vapor from entering, and the second sealant is used to maintain the stability of the structure. If the insulating glass system only uses a single-channel seal, the insulating glass sealant must not only play a sealing role but also play a structural role, but no glue can have excellent sealing and structure at the same time. Therefore, the result of single-pass sealing can only greatly reduce the sealing life of insulating glass.

All links in the production of insulating glass will directly or indirectly affect the construction quality of the insulating glass sealant, which in turn affects the sealing life of the insulating glass. The whole process of production includes glass cutting and cleaning, spacer cutting and cleaning, desiccant selection and filling, spacer striping, combining and gluing. The following links should be paid attention to in the management of glue quality:
(1) The double-pass sealant must be compatible with glass, spacers, etc.; the second-pass sealant should ensure the quality of the two-component mixture and do a butterfly test;
(2) The first seal must be continuous and even;
(3) The second seal must also be continuous and uniform, and be in complete contact with the first sealant;
(4) The correct ratio of polyisobutylene rubber to the second seal structural rubber is 1:3;
(5) The spacer frame must be placed parallel to the edge of the glass at an equal distance.

In a nutshell, when choosing an insulating glass sealant, the performance of the adhesive, the convenience of using the adhesive, and the impact of the adhesive on human health, safety and the environment should be considered comprehensively. 　
Specifically, the following factors should be considered:
(1) The compatibility of glue and glass;
(2) The modulus of the glue;
(3) Whether the processing is easy;
(4) Water vapor transmission rate;
(5) Bonding strength to glass and spacer;
(6) Intrinsic strength;
(7) Anti-ultraviolet ability;
(8) The ability to hold inert gas;
(9) Compatibility with coated glass;
(10) The shrinking process of the glue is harmless to the environment and users.