The usage of glue is as follows:
(1), pressure situation. When the adherend is subjected to peeling force and uneven tearing force, an adhesive with good toughness, such as rubber glue and polyurethane adhesive, can be selected; When bearing uniform tearing force and shearing force, you can choose adhesives with higher hardness and strength, such as epoxy adhesive and acrylate adhesive.
(2) Temperature situation. Different glues have different heat resistance. Choose different glues according to different temperatures.
(3) Humidity. Moisture and moisture are unfavorable to the stability of bonding interface, which can be said to be harmful. Due to the small size and high polarity of water molecules, the bonding strength and durability are reduced due to hydrolysis after infiltration and diffusion, which destroys the bonding surface or detaches itself. If the adherend requires good water resistance, choose epoxy adhesive, polyurethane adhesive, etc.
(4), chemical medium. Chemical medium mainly refers to acid, alkali, salt, solvent, etc. Different types of glue and curing conditions have different medium resistance. Therefore, glue and sealant should be selected according to the medium contacted by the adherend.
(5) Outdoor conditions. The conditions of outdoor bonding connectors are complex, and the changes of air temperature, wind and rain, sun exposure and freezing will accelerate the aging of the bonding layer and shorten its life. Therefore, under outdoor conditions, adhesives with high temperature curing and good atmospheric aging resistance should be selected for bonding, such as phenolic acetal adhesive and epoxy nitrile rubber. Silicone sealants is selected as the seal.