Adhesive process operating conditions
Time：2013-08-29 14:00:40 Hits：1218
In conditions of use adhesives and sealing glue to be used in a certain environment, working conditions on the bonding properties have a major impact.
The conditions of use, there is the force, ambient temperature and humidity, chemical medium conditions, outdoor conditions, etc.
(1), by the force of circumstances. When the subject was sticky peeling, uneven pull off force, the choice of toughness, good rubber, such as rubber adhesives, polyurethane rubber, etc.; when pulled away by a uniform force, shear force, the choice of hardness and strength than high adhesive, such as epoxy adhesive, acrylic adhesive.
(2), temperature conditions. Different adhesives have different heat resistance. Depending on the temperature, use of different adhesives.
(3), and humidity. Moisture and moisture on the stability of the bonding interface is very unfavorable, can be said to be harmful and useless. Because water molecules small, polar, after penetration, diffusion, serve as a hydrolysis, so that self-destruction or disengaged plastic junction, resulting in lower bonding strength and durability. The sticky parts require good water resistance, the election epoxy glue, polyurethane glue.
(4), chemical media. Mainly refers to the chemical mediators acid, alkali, salt, solvent, etc., different types of adhesive, different curing conditions, resistance to media having different capabilities. Therefore, according to media contact was sticky adhesives and sealants used.
(5), outdoor conditions. Outdoor use glued pieces in which a more complex condition, temperature changes, wind and rain, sun and frost, etc., will accelerate the aging layer, so that shortened life expectancy. Therefore, in outdoor conditions, high temperature curing bonding to use and good resistance to atmospheric aging glue, such as phenolic an acetal plastic, epoxy a nitrile rubber; sealing silicone sealant is used.
