Comb-shaped self-emulsifying nonionic type water-borne epoxy resin, water-borne epoxy resin emulsion and water-borne epoxy resin preparation method

The invention discloses a comb-shaped self-emulsifying nonionic type water-borne epoxy resin, a water-borne epoxy resin emulsion and a water-borne epoxy resin preparation method. According to the water-borne epoxy resin preparation method, bisphenol-A or bisphenol-F type epoxy resin low in molecular weight is subjected to chain extension, and comb-shaped hydrophilic nonionic chain segments are introduced into the structure of the bisphenol-A or bisphenol-F type epoxy resin through chemical modification to obtain the comb-shaped self-emulsifying nonionic type water-borne epoxy resin. Self-emulsifying capability of the water-borne epoxy resin is enhanced greatly through the comb-shaped structure, and the emulsion comprising the water-borne epoxy resin can be stored for more than six months and can be used as a basic material of water-borne epoxy resin paint.