Questions about epoxy resin adhesives
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There are bubbles in the epoxy resin adhesive; it generates a large amount of heat during curing and turns yellow. How can this be resolved?
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Epoxy resin adhesives turn yellow; one reason is the high color intensity of the resin itself, and the other is related to the curing agent. A good basic epoxy resin should have excellent resistance to yellowing, such as Nanya 128 epoxy resin. There are bubbles in the glue; the simplest way to remove them is by evacuating the air or heating it.
Our epoxy resin is slightly yellow in color to begin with, but the yellowing becomes more pronounced during the curing process, and a large amount of heat is released. Bubbles form within the resin after curing, and these bubbles are difficult to remove
1. It is recommended to use colorless and transparent resin (from reputable manufacturers, such as Nanya 128)； 2. A exothermic reaction occurs during curing, which is normal ； 3. Excessive bubbles that are difficult to dissipate may be due to high viscosity; an appropriate amount of reactive diluent can be added ； 4. Using vacuum pumping can eliminate bubbles. 5. A colorless appearance can be achieved using a modified polyetheramine curing agent.