Preparation and properties of Ymer N120 modified non-ionic waterborne epoxy emulsion

Abstract:

In order to overcome the disadvantage of low content of epoxy group and solid in current waterborne epoxy (WEP) emulsion, polyethylene glycol 400 (PEG400) was used as soft section to prepare non-ionec WEP emulsion firstly. Then, the modified non-ionic waterborne epoxy (YWEP) emulsion was synthesized with the side hydrophilic chain extender (Ymer N120). The effects of the dosage of Ymer N120 on the properties of YWEP emulsion and paint film were studied. The results showed that the epoxy group content (represented by epoxy value) of the WEP emulsion could be increased as high as 0.36, and the solid content pof YWEP emulsion increased by 73.3% from 30% to 52% while maintaining the high expoxy value. After curing, the tensile strength of the film increases from 57.3 MPa to 64.8 MPa. The corrosion current density decreased from7.97E-8 mA*cm-2 to 9.99E-9 mA*cm-2. In conclusion, the transfer of hydrophilic groups from the main chain to the side group can effectively improve the properties of waterborne epoxy emulsions, coatings and coatings.