Preparation and properties of multi-responsive self-healing non-isocyanate polyurethane gel coating

Abstract

ABSTRACT Traditional polyurethane coating is prepared by combining isocyanate and polyol, but isocyanate is toxic, which is not conducive to the sustainable development of ecological environment. In this paper, dibutyltin dilaurate (DBTDL) was used as catalyst to synthesize dicyclic carbonate from four different acids and glycerol carbonates. Then, it was gradually polymerized with isophorone diamine (IPDA) and 4,4’-diaminodiphenyl disulfide ether to synthesize self-healing non-isocyanate polyurethane (NIPU). The effects of different acid types on coating forming and self-healing properties of NIPU were studied. Then, polypyrrole modified carbon nanotubes were prepared and physically blended with NIPU to obtain a responsive NIPU gel coating. The results show that NIPU has excellent scratch repair performance at 70°C by optical microscopy; Through the dissolution and re-formation of NIPU by N, N-dimethylformamide, it is proved that the material has repeatable processability and is conducive to the sustainable development of ecological environment; The high precision multimeter proved that NIPU has the responsiveness under different chemical environment of acid, alkali, oxidation and reduction. The coating has broad application prospects in biomimetic technology, biology, electronics and other fields.