Epoxy resin adhesive generally refers to an adhesive made with epoxy resin as the main body. Epoxy adhesive should generally also include an epoxy curing agent, otherwise the adhesive will not cure. There will be foaming after curing in operation, so what is the reason?
Bubbles after curing should be analyzed from two aspects: one is the bubbles brought in during the adhesive mixing process or the adhesive filling process, and the other is the bubbles generated during the curing process.
During the adhesive mixing process, due to the high viscosity of the adhesive or the wrong stirring method, it is easy to bring air into the adhesive solution. If the viscosity of the adhesive solution is high, it is difficult to eliminate the air bubbles. If the viscosity of the adhesive is small, if the adhesive cures slowly, the air bubbles will slowly rise to the surface and be eliminated automatically. To eliminate air bubbles in the process of adjusting and filling adhesive, vacuuming, heating to reduce viscosity, adding diluent to reduce viscosity, or adding defoamer can be used to eliminate air bubbles.
There are several reasons for the generation of bubbles during the curing process: too fast curing speed, high exothermic temperature, large curing shrinkage rate of the adhesive, too much solvent and plasticizer in the adhesive are easy to generate bubbles during the curing process. To solve these problems in the curing process, it is necessary to adjust the overall formula of the adhesive.
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