Epoxy Resin Casing Process

epoxy bushing The process involves multiple links, and each step requires fine operation to ensure the quality of the finished product. The process is roughly divided into material preparation, epoxy resin bushing prefabrication, resin mixing, impregnation, curing, post-processing, inspection and packaging. The specific operation details directly affect epoxy resin cast bushing product performance.
In the material preparation stage, epoxy resin, curing agent, filler and reinforcing material are key raw materials. Epoxy resin usually uses low viscosity models to facilitate subsequent impregnation; the ratio of curing agent to resin needs to be strictly calculated, and the error is controlled within ±1% to avoid incomplete curing or overreaction. Fillers such as silica powder are used to adjust the fluidity of the resin, and reinforcing materials are mostly glass fiber cloth or alkali-free cloth, which are cut to size in advance. The ambient temperature and humidity must be stable at 25℃±2 and humidity 50%±5% to prevent the material from absorbing moisture or curing prematurely.
epoxy bushing manufacturer Prefabrication includes mold cleaning and release agent coating. Before using the mold, wipe it with acetone to remove oil stains and spray a fluorine-containing release agent to form a uniform film. During prefabrication, select metal or silicone molds according to epoxy bushing for transformer specifications, polish the inner wall to below Ra0.8 to ensure a smooth surface after demoulding. Preheat the mold to 40-50℃ to reduce the shrinkage of the resin during cooling.