Synthesis and Application of Waterborne Pentaerythritol Sulfonate Cyclic Carbonate Emulsions

Most of the existing NIPU uses organic solvent; the waterborne cyclic carbonate emulsion using traditional carboxyl group as hydrophilic group has low solid content, and the waterborne nonisocyanate polyurethane (WNIPU) film has poor thermal comprehensive performance. In this paper, pentaerythritol glycidyl ether and CO 2 were used to prepare pentaerythritol cyclic carbonate (PGC), which reacted with amino sulfonic acid derivatives to introduce strong hydrophilic sulfonic acid group to prepare waterborne PGC emulsion with high solid content and good storage stability, and then were cured with amine curing agent to obtain WNIPU. It was found that the average particle size and absolute Zeta potential (| ζ |) of the cyclic carbonate emulsion obtained by choosing 2‐sulfamic acid were the smallest. The flexibility, adhesion and pencil hardness of the cured film became better. Compared with the solvent‐based NIPU film prepared with PGC, the pencil hardness (F) of the WNIPU film cured with isophorone diamine (IPDA) was higher while the impact resistance (40 cm kg) and adhesion of the WNIPU film cured with polyethylenimide (PEI‐300) were more excellent, and the shear strength (6.25 MPa) and peel strength (1.54 kN m −1 ) on the board were better than those of solvent‐based NIPU, which can be used as an adhesive. At the same time, the WNIPU film also has a certain self‐healing performance, and its thermal stability is also better. This study provides a new method and a new idea for the waterification of cyclic carbonate and NIPU.