A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder Coating
Thermoset powder coatings exhibit distinctive characteristics such as remarkable hardness and exceptional resistance to corrosion. In contrast to conventional paints, powder coatings are environmentally friendly due to the absence of volatile organic compounds (VOCs). However, their irreversible cro...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-09-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/15/19/3894 |
| _version_ | 1797575291480047616 |
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| author | Yongqi Liu Ziyuan Li Caifu Zhang Biru Yang Hua Ren |
| author_facet | Yongqi Liu Ziyuan Li Caifu Zhang Biru Yang Hua Ren |
| author_sort | Yongqi Liu |
| collection | DOAJ |
| description | Thermoset powder coatings exhibit distinctive characteristics such as remarkable hardness and exceptional resistance to corrosion. In contrast to conventional paints, powder coatings are environmentally friendly due to the absence of volatile organic compounds (VOCs). However, their irreversible cross-linking structures limit their chain segment mobility, preventing polymers from autonomously repairing cracks. Dynamic cross-linking networks have garnered attention for their remarkable self-healing capabilities, facilitated by rapid internal bond exchange. Herein, we introduce an innovative method for synthesizing thermoset epoxy containing boronic ester moieties which could prolong the life of the powder coating. The epoxy resin system relies on the incorporation of two curing agents: one featuring small-molecule diamines with boronic bonds and the other a modified polyurethane prepolymer. A state of equilibrium in mechanical properties was achieved via precise manipulation of the proportions of these agents, with the epoxy composite exhibiting a fracture stress of 67.95 MPa while maintaining a stable glass transition temperature (Tg) of 51.39 °C. This imparts remarkable self-healing ability to the coating surface, capable of returning to its original state even after undergoing 1000 cycles of rubbing (using 1200-grit abrasive paper). Furthermore, the introduction of carbon nanotube nanoparticles enabled non-contact sequential self-healing. Subsequently, we introduce this method into powder coatings of different materials. Therefore, this work provides a strategy to develop functional interior decoration and ensure its potential for broad-ranging applications, such as aerospace, transportation, and other fields. |
| first_indexed | 2024-03-10T21:36:31Z |
| format | Article |
| id | doaj.art-2e6d3c6132ce4c1cab35348376156689 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T21:36:31Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-2e6d3c6132ce4c1cab353483761566892023-11-19T14:56:04ZengMDPI AGPolymers2073-43602023-09-011519389410.3390/polym15193894A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder CoatingYongqi Liu0Ziyuan Li1Caifu Zhang2Biru Yang3Hua Ren4Ningbo Research Institute, Zhejiang University, Ningbo 315807, ChinaSchool of Biological and Chemical Engineering, Ningbo Tech University, Ningbo 315100, ChinaTongling Shanwei New Material Technology Inc. Co., Ltd., Tongling 244000, ChinaNingbo Research Institute, Zhejiang University, Ningbo 315807, ChinaNingbo Research Institute, Zhejiang University, Ningbo 315807, ChinaThermoset powder coatings exhibit distinctive characteristics such as remarkable hardness and exceptional resistance to corrosion. In contrast to conventional paints, powder coatings are environmentally friendly due to the absence of volatile organic compounds (VOCs). However, their irreversible cross-linking structures limit their chain segment mobility, preventing polymers from autonomously repairing cracks. Dynamic cross-linking networks have garnered attention for their remarkable self-healing capabilities, facilitated by rapid internal bond exchange. Herein, we introduce an innovative method for synthesizing thermoset epoxy containing boronic ester moieties which could prolong the life of the powder coating. The epoxy resin system relies on the incorporation of two curing agents: one featuring small-molecule diamines with boronic bonds and the other a modified polyurethane prepolymer. A state of equilibrium in mechanical properties was achieved via precise manipulation of the proportions of these agents, with the epoxy composite exhibiting a fracture stress of 67.95 MPa while maintaining a stable glass transition temperature (Tg) of 51.39 °C. This imparts remarkable self-healing ability to the coating surface, capable of returning to its original state even after undergoing 1000 cycles of rubbing (using 1200-grit abrasive paper). Furthermore, the introduction of carbon nanotube nanoparticles enabled non-contact sequential self-healing. Subsequently, we introduce this method into powder coatings of different materials. Therefore, this work provides a strategy to develop functional interior decoration and ensure its potential for broad-ranging applications, such as aerospace, transportation, and other fields.https://www.mdpi.com/2073-4360/15/19/3894self-healingphoto-thermalboronic esterepoxypowder coating |
| spellingShingle | Yongqi Liu Ziyuan Li Caifu Zhang Biru Yang Hua Ren A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder Coating Polymers self-healing photo-thermal boronic ester epoxy powder coating |
| title | A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder Coating |
| title_full | A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder Coating |
| title_fullStr | A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder Coating |
| title_full_unstemmed | A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder Coating |
| title_short | A Self-Healing Thermoset Epoxy Modulated by Dynamic Boronic Ester for Powder Coating |
| title_sort | self healing thermoset epoxy modulated by dynamic boronic ester for powder coating |
| topic | self-healing photo-thermal boronic ester epoxy powder coating |
| url | https://www.mdpi.com/2073-4360/15/19/3894 |
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