The invention relates to the field of adhesives, in particular to a high-temperature-resistant flexible single-component
epoxy sealing
adhesive and a preparation method thereof. The high-temperature-resistant flexible single-component
epoxy sealing
adhesive is prepared from the following raw materials in parts by weight: 10-40 parts of
epoxy resin, 10-30 parts of a mixed
softening resin, 5-20 parts of an active
diluent, 5-20 parts of a mixed curing agent, 0.01-1 part of a
polymerization inhibitor, 0.1-5 parts of
fumed silica, 0.01-1 part of an infiltration flow
promoter and 5-30 parts of spherical silica
powder, the mixed curing agent is a mixture of a modified amine
latent heat curing agent and a modified
imidazole latent heat curing agent, and the mixed
softening resin is prepared from at least two of F100, F300, Capa3050, H2004, HEF750, HEF751, EP-4000L and EP-4000S. The
adhesive disclosed by the invention can be widely applied to sealing processes of
USB ports and high-temperature-resistant
reflow soldering processes, has good bonding performance on PA46, stainless steel, PC and the like, and ensures excellent waterproof sealing performance and plugging resistance of the
USB ports of electronic products.