Can someone tell me the characteristics of epoxy resin, vinyl resin, and unsaturated resin and how they differ?

These are just branches of resins! There is no replacement, just different applications for each!

It's like chicken thighs, chicken wings, chicken breasts! All good, but suited to different eating practices!

Epoxy resin: high mechanical strength, good aesthetics! Suitable for their respective electronic factories, purification workshop! But not corrosion-resistant

Vinyl: very good corrosion resistance, suitable for most of the anti-corrosion requirements! Disadvantages: bad mechanical properties, construction must be added fiberglass cloth!

Unsaturated resin: a thermosetting resin, when it is under the action of heat or initiator, can be cured into an insoluble polymer mesh polymer. However, the mechanical strength of this polymer is very low and cannot meet the requirements of most uses. It also requires the addition of fiberglass when used. Inexpensive.