In daily production of electronic products, most of the structural adhesive materials we come into contact with are epoxy resin or polyurethane. What issues should be paid attention to when selecting or using structural adhesives of these two materials?
1. Polyurethane structural adhesive
Polyurethane adhesive does not contain solvents, has the characteristics of simple application process, convenient storage and transportation, and can be cured at room temperature or thermally. Its adhesive layer Elastic and high shear strength. Therefore, this structural adhesive has been used for sealing the rotor tip cover of the “Dolphin” helicopter, bonding metal-carbon fiber composite materials, repairing components, etc., and has achieved satisfactory results.
Polyurethane structural adhesive has high strength, a wide range of bonding objects (materials), and is easy to bond. The bonded surface does not require special surface treatment. It cures at room temperature and will It releases heat, but its biggest disadvantage is poor high temperature resistance. Ordinary ones do not exceed 100 degrees Celsius, good ones do not exceed 200 degrees Celsius;
2. Epoxy resin structural adhesive
Epoxy structural adhesive is a solvent-free liquid epoxy resin adhesive that can be cured at room temperature or under heat. The cured adhesive layer is medium hard and can withstand strong impact and vibration. The adhesive layer has good mechanical properties, good electrical insulation, and can withstand temperature changes and bending and tearing stress.
EpoxyResinStructural adhesives feature a wide temperature range and can be positioned quickly without the need for welding, mechanical fasteners or rivets. Non-corrosive and has good adhesion to metals, ceramics, vulcanized rubber, fiberglass products, and carbon fiber products. Temperature and oil resistant.
However, when choosing glue, you must not only look at the characteristics of the material, but also the characteristics of each glue itself, such as temperature range, adhesion, and curing Time and other details, whether it is suitable for your own use.
