Aqueous dispersion comprising polyurethane or polyurethane-urea, preparation method therefor and use thereof

A hydrolysis-resistant aqueous dispersion comprising polyurethane or polyurethane-urea, wherein the polyurethane or polyurethane-urea comprised in the aqueous dispersion is prepared by reacting raw materials comprising the following components:

• (a) a compound having a tertiary amine group and at least one NCO reactive functional group,
• (b) a polyester polyol having a number average molecular weight of 400 to 5000 and a functionality of 2 to 3,
• (c) an organic compound having at least two isocyanate groups,
• (d) a hydrophilic compound having one or more of an ionic group, a potential ionic group and a non-ionic group and having 2 to 3 NCO reactive functional groups,
• (e) a mono-functional non-ionic hydrophilic compound having at least one NCO reactive functional group,
• (f) optionally, a compound having 1 to 3 NCO reactive functional groups, and
• (g) optionally, a blocking agent in the field of isocyanates or an unsaturated compound having a polymerization reactive group;
• wherein based on the total weight of components,
• the amount of the component (b) is 70 wt % to 90 wt %;
• wherein the polyurethane or polyurethane-urea comprises a structural unit as shown in Formula (I):
• wherein R is selected from a residue of the component (a) after the NCO reactive functional group is removed.