Preparation and Self-Healing Application of Isocyanate Prepolymer Microcapsules
In this study, we successfully manufactured polyurethane microcapsules containing isocyanate prepolymer as a core material for self-healing protection coatings via interfacial polymerization of a commercial polyurethane curing agent (Bayer L-75) and 1,4-butanediol (BDO) as a chain extender in an emu...
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| Veröffentlicht in: | Coatings (Basel) 2022-02, Vol.12 (2), p.166 |
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| creator | Xiang, Guifeng Tu, Jing Xu, Heng Ji, Jie Liang, Li Li, Haozhe Chen, Haoran Tian, Jingqing Guo, Xiaode |
| description | In this study, we successfully manufactured polyurethane microcapsules containing isocyanate prepolymer as a core material for self-healing protection coatings via interfacial polymerization of a commercial polyurethane curing agent (Bayer L-75) and 1,4-butanediol (BDO) as a chain extender in an emulsion solution. With an optical microscope (OM) and a scanning electron microscope (SEM), the resulting microcapsules showed a spherical shape and an ideal structure with a smooth surface. Fourier transform infrared spectra (FTIR) showed that the core material was successfully encapsulated. Thermal gravimetric analysis (TGA) showed that the initial evaporation temperature of the microcapsules was 270 °C. In addition, we examined the influence of the concentration of the emulsifier and chain extender on the structure and morphology of the microcapsules. The results indicate that the optimal parameters of the microcapsule are an emulsifier concentration of 7.5% and a chain extender concentration of 15.38%. Microcapsules were added to the epoxy resin coating to verify the coating’s self-healing performance by a surface scratch test, and the results showed that the cracks could heal in 24 h. Furthermore, the self-healing coating had excellent corrosion resistance. |
| doi_str_mv | 10.3390/coatings12020166 |
| format | Article |
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With an optical microscope (OM) and a scanning electron microscope (SEM), the resulting microcapsules showed a spherical shape and an ideal structure with a smooth surface. Fourier transform infrared spectra (FTIR) showed that the core material was successfully encapsulated. Thermal gravimetric analysis (TGA) showed that the initial evaporation temperature of the microcapsules was 270 °C. In addition, we examined the influence of the concentration of the emulsifier and chain extender on the structure and morphology of the microcapsules. The results indicate that the optimal parameters of the microcapsule are an emulsifier concentration of 7.5% and a chain extender concentration of 15.38%. Microcapsules were added to the epoxy resin coating to verify the coating’s self-healing performance by a surface scratch test, and the results showed that the cracks could heal in 24 h. Furthermore, the self-healing coating had excellent corrosion resistance.</description><identifier>ISSN: 2079-6412</identifier><identifier>EISSN: 2079-6412</identifier><identifier>DOI: 10.3390/coatings12020166</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Butanediol ; Composite materials ; Corrosion resistance ; Curing ; Curing agents ; Efficiency ; Emulsifiers ; Epoxy resins ; Fourier transforms ; Gravimetric analysis ; Infrared spectra ; Isocyanates ; Microencapsulation ; Microscopy ; Optical microscopes ; Particle size ; Polymerization ; Polymethyl methacrylate ; Polyurethane resins ; Prepolymers ; Protective coatings ; Scratch tests ; Self healing materials ; Thermal analysis</subject><ispartof>Coatings (Basel), 2022-02, Vol.12 (2), p.166</ispartof><rights>2022 by the authors. Licensee MDPI, Basel, Switzerland. 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| ispartof | Coatings (Basel), 2022-02, Vol.12 (2), p.166 |
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| source | MDPI - Multidisciplinary Digital Publishing Institute; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Butanediol Composite materials Corrosion resistance Curing Curing agents Efficiency Emulsifiers Epoxy resins Fourier transforms Gravimetric analysis Infrared spectra Isocyanates Microencapsulation Microscopy Optical microscopes Particle size Polymerization Polymethyl methacrylate Polyurethane resins Prepolymers Protective coatings Scratch tests Self healing materials Thermal analysis |
| title | Preparation and Self-Healing Application of Isocyanate Prepolymer Microcapsules |
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