無機聚合深色散熱塗料之開發

A Study on Development of Geopolymeric Radiative Cooling Dark Coating

古竹君(C.C. Ku) ； 鄭大偉(T.W. Cheng) ； 黃志弘(C.H. Huang) ； 李有豐(Y.F. Li)

《鑛冶：中國鑛冶工程學會會刊》 65卷4期 (2021/12) Pp. 16-29

https://doi.org/10.30069/MM.202112_65(4).02

摘要

隨著現今科技高度發展，全球暖化日益嚴重。同時，都市地區的瀝青鋪面與建築物其高吸熱特性加劇了熱島效應。為了解決上述問題，許多散熱或隔熱塗料相繼而生，然而其顏色多為淺色或白色，故長時間在戶外易因灰塵及外在汙染物而影響原有外觀，甚至降低其散熱或隔熱性能。本研究開發之無機聚合深色散熱塗料，其發射率可達0.83，反射率達37.4 %，熱導率達1.06 W/mK，模擬日照試驗於照燈時第150～500分鐘可有效降低水泥砂漿板表面平均溫度約1.5 °C、底部溫度約2 °C。實際日照於正午可有效降低水泥砂漿板表面溫度1.5 °C、底部溫度2.1 °C，夜間可有效降低水泥混凝土板表面溫度0.1°C。期望未來該塗料可應用於道路鋪面、建築外殼等，以減緩都市地區熱島效應。

關鍵字

無機聚合材料 ； 輻射冷卻 ； 無機塗料 ； 散熱 ； 隔熱

並列摘要

Since fossil industries have highly developed from the last few centuries, the global warming due to greenhouse gas effect is getting worse than before. In the urban area, the asphalt pavements and reinforced concrete buildings with great heat capacity have aggravated the urban heat island effect. In order to reduce the urban heat island effect, numerous innovative coatings related to heat dissipating or heat insulating have been developed, and most of them are light-colored or white. As time passed, the dust and pollutants might cover or even pollute the above-mentioned coating, the heat dissipating functions would be reduced. Therefore, eco-friendly dark coating would be a probable solution. In this study, a dark-color passive radiative cooling coating was developed based on the geopolymeric technology, which has an emissivity of 0.83, a reflectivity of 37.4%, and a thermal conductivity of 1.06 W/mK. In addition, the concrete specimens which painted coating or uncoated were both tested through the simulated sunlight apparatus. The specimens were heated by sunlight apparatus for about 150 minutes until the temperature becomes steady state. Compared to the uncoated specimen (benchmark), the average temperature of the coated specimen was decreased about 1.5 °C on the top surface and about 2 °C on the bottom surface. From the results of the simulated sunlight test, the coating can effectively reduce the specimen surface temperature 1.5 °C and the bottom of 2.1 °C, and it can effectively reduce the surface temperature of specimens by 0.1 °C at night. This geopolymeric inorganic coating is expected to apply on asphalt concrete pavements and reinforced concrete buildings to mitigate the urban heat island effect.

並列關鍵字

Geopolymer ； Radiative cooling ； Inorganic coating ； Heat-dissipating ； Heat-insulating