| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 106 === Coatings are widely used because they have important functions such as decoration and protective covering in daily life. In this study, the new smart polyurethane (PU) coatings were fabricated by adding photothermal materials. They could repair themselves to extend their service life after damage. First, the effect of the ratio of the polyester diols used as long-chain oligomers and disulfide-containing diols as chain extenders on the physical properties and post-injury repair of self-healing PU coatings was investigated. Second, the self-healing PU coating was mixed with the hydrophobic modified cesium tungsten oxide which has been fabricated by our laboratory. The effect of the photothermal influence of cesium tungsten oxide on the physical properties and heat healing of the coatings was studied.
The experimental results showed that the hardness of PU coating could increase to F grade, melt at 43℃ and repair complete at 60℃, which on the condition of the ratio of oligomer and chain extender was 1:4. The other ratios of the PU coating had the molecular weight between 28770 and 90757. These coatings all have good film forming ability. Optical micrographs also showed that all films had the ability to repair themselves repeatedly.
Compared with non-cesium tungsten oxide coating, which surface temperature of 47℃, the temperature of the coating with 0.03wt% cesium tungsten oxide was above 51℃, after 60 minutes of irradiation from a solar simulator. In addition, the hardness and adhesion of the coating after adding cesium tungsten oxide could rise from F to H and 4 to 2.
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