| LIU Jiang-tao,WANG Jin-wei,ZHANG Da-wei,LIU Wei.Water Tolerance and Corrosion Resistance of Polyurethane Coatings Modified by MA-g-Polybutadiene[J],49(6):210-215 |
| Water Tolerance and Corrosion Resistance of Polyurethane Coatings Modified by MA-g-Polybutadiene |
| Received:August 13, 2019 Revised:June 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.06.025 |
| KeyWord:polyurethane reactive rubber chemical modification water absorption corrosion resistance |
| Author | Institution |
| LIU Jiang-tao |
Corrosion and Protection Center, Institute of Advanced Materials and Engineering, University of Science and Technology Beijing, Beijing , China |
| WANG Jin-wei |
Corrosion and Protection Center, Institute of Advanced Materials and Engineering, University of Science and Technology Beijing, Beijing , China |
| ZHANG Da-wei |
Corrosion and Protection Center, Institute of Advanced Materials and Engineering, University of Science and Technology Beijing, Beijing , China |
| LIU Wei |
Corrosion and Protection Center, Institute of Advanced Materials and Engineering, University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| The work aims to improve the comprehensive performances of polyurethane coatings, including water tolerance, corrosion resistance, etc. Reactive rubber-maleic anhydride polybutadiene (MAPB) was used to modify the polyurethane coating and the structure and properties of composite coating were characterized by Fourier transform infrared spectroscopy, contact angle, water tolerance, electrochemical impedance spectrum, etc. By comparing and analyzing the changes of absorption peaks of polyurethane groups before and after modification in Fourier transform infrared spectroscopy (FT-IR), it was confirmed that MAPB successfully modified polyurethane. The addition of MAPB in PU coatings resulted in the enhancement of hydrophobicity, decrease of water absorption and improvement of mechanical performances. When the content of MAPB was added to about 3%~5%, the contact angle increased from 75° to 95°, the water absorption reduced from 1.5% to a minimum of about 0.5%, the hardness increased from 3H to 4H, and the adhesion increased from 4B to 5B. In addition, with the increase in immersion time in NaCl solution, the resistance values of the modified coatings decreased more slowly, indicating that the addition of MAPB improved the corrosion resistance of the PU coatings, especially the coating containing 3% MAPB performed the best in corrosion resistance, which was further verified by the results of salt spray test. MAPB of about 3% can greatly reduce the water absorption of the PU coatings, and improve their overall performance including corrosion resistance, because the coating compactness is improved through chemical cross-linking reaction and the hydrophobic character of the olefinmain chain enhances blocking ability upon the diffusion of water and corrosive media. |
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