Study of Water Resistance of Polyurethane Coatings
Author Information
Author(s): Xie Chao, Shi Yufeng, Si Zhuozhuo, Wu Ping, Sun Binqiang, Ma Wenzhe, Predoi Daniela
Primary Institution: Lanzhou Jiaotong University
Hypothesis
The microstructural changes in polyurethane coatings affect their water resistance properties.
Conclusion
Coatings with diluent contents of 20% and 25% showed superior water penetration resistance and mechanical property retention.
Supporting Evidence
- Coatings with 20% and 25% diluent content showed the best water resistance.
- Mechanical properties of coatings deteriorated after water immersion.
- Free volume and characteristic molecular groups significantly influence water resistance.
- Hydrophilic groups in coatings can lead to increased water absorption.
- Time-dependent behavior of water within coatings was analyzed using NMR.
Takeaway
This study looked at how different amounts of a liquid added to coatings change how well they resist water. Some coatings worked much better than others.
Methodology
The study involved preparing polyurethane coatings with varying diluent contents and testing their water resistance and mechanical properties using various analytical methods.
Limitations
The study primarily focused on the effects of diluent content and did not explore other potential factors affecting water resistance.
Digital Object Identifier (DOI)
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