Laser waterless cleaning of residual organic solvents on the surface of polyurethane coatings

Residual organic solvents have a great impact on the physical and mental health of equipment operators in industry and agriculture. Laser waterless cleaning technology of residual organic solvents on the surface of polyurethane coatings has great application prospects and is a good way to tackle the pollution problem. In this paper, the evo-lutionary behavior of a laser waterless cleaning mechanism and substrate surface state is analyzed. The influence law of laser energy density and scanning speed on the residual solvent cleaning effect was investigated. The optimal laser cleaning parameters were obtained by comprehensive evaluation of the substrate surface cleaning effect and microscopic morphology. The peak of solvent characteristics before and after laser cleaning was detected by Raman spectroscopy. The results demonstrated that the laser cleaning effect was better with the increase of energy density or the decrease of scanning speed in the substrate damage range, and the best laser cleaning parameters were laser energy density of 0.24 J/cm2 and scanning speed of 500 mm/s. A significant reduction of the peak of Raman spec-troscopy was found, reflecting the excellent effect of laser waterless cleaning of residual organic solvents.& COPY; 2023 Optica Publishing Group

Automated summary

This paper analyzes the evolutionary behavior of a laser waterless cleaning mechanism and substrate surface state, and investigates the influence law of laser energy density and scanning speed on the residual solvent cleaning effect. The optimal laser cleaning parameters are obtained by comprehensive evaluation of the substrate surface cleaning effect and microscopic morphology. Raman spectroscopy detects a significant reduction of the peak, reflecting the excellent effect of laser waterless cleaning of residual organic solvents.