Abstract:
Based on the reversible Diels-Alder reaction between furan and maleimide, a water-borne polyacrylate coating with self-healing properties driven by heat was successfully prepared, and the self-healing conditions were explored and optimized. A novel acrylate monomer with furan functional group (FEEMA) was synthesized. Stable acrylate emulsion was obtained by soap-free emulsion copolymerization. The results were verified by infrared spectroscopy, gel permeation chromatography (GPC) and particle size analysis (DLS). Then, polyether chain (D-400-BMI) was designed and synthesized, which could be dispersed in water. The crosslinked films were prepared by Diels-Alder reaction with water-based acrylate emulsion. The process of Diels-Alder and retro-DA reactions under different conditions were followed by infrared spectroscopy and differential scanning calorimetry. The results showed that the crosslinked membranes prepared by D-400-BMI had better repair performance when the content of FEEMA was 30% and the mass ratio of MMA and BA was 1/5. After the crosslinked membrane was scratched, the surface of the scratch and friction traces showed a good repair effect by heating for 140 ℃ and then slowly cooling to room temperature. The crosslinked membrane also has good heat resistance and mechanical properties, so it has potential application prospect in the self repair of scratch and microcrack of surface coatings.
