本研究分為兩個部分，第一部分利用商用塗料以不同製程(刮刀塗佈法、浸塗法及噴塗法)製備太陽能吸收膜，太陽能選擇性吸收膜的吸收率可達0.92-0.94，經由太陽光模擬器照射後測量銅板熱平衡溫度差高達60-62 oC。利用浸塗法塗佈成膜需要調配商用塗料固成分50 wt%以上，此外，經噴塗法塗佈成膜，在DMF溶劑下，需噴塗34 g/m2以上；在丙酮溶劑下，需噴塗40 g/m2以上。除了以噴塗法在丙酮溶劑下塗佈的吸收膜，其餘的太陽能吸收膜對銅基材的附著程度均有好的表現。 第二部分為含奈米金粒子PU選擇性吸收膜之製備與性質分析，具有硫醇官能基的聚胺基甲酸酯作為黏合劑及奈米金保護劑，金鹽會在銅板上還原後形成奈米金粒子及銅氧化物。當提高金鹽濃度，其吸收率及光熱轉換表現越好，然而，即使金鹽濃度降低至3.03 mM，PU固成分極低之下，太陽光模擬機照射後，銅基材的熱平衡溫度差提升至67 oC。 This study was divided into two parts. The first part was the solar absorber coatings prepared using a commercial paint via different coating processes (doctor blading, dip coating, and spray method). The absorbance of the solar spectrally selective absorber coatings can reach to 0.92~0.94, and the temperature increment of the copper substrates after exposing under a standard sunlight intensity can be up to 60~62 oC. It was found that, a high solid content (50 wt%) was required when the absorber coatings were made by using dip coating. Besides, weights of the coated absorber made by using spray method have to exceed 34 g/m2 and 40 g/m2 when DMF and acetone was the solvent, respectively. The adhesion of the absorber coating to the copper substrate was quite good except that of the absorber coating made by using spray method and acetone as the solvent. The second part was the preparation and characterization of poly(urethane) based solar spectrally selective absorber coatings containing gold nanoparticles. Poly(urethane) containing thiol groups acted as the binder and the protecting agent of gold nanoparticles. Gold nanoparticles were formed by reducing HAuCl4 and copper oxides were formed by oxidizing the copper substrate. As the concentration of HAuCl4 increased, both absorbance and photo-thermal conversion performance increased. However, even though the concentration of HAuCl4 was quite low (3.03 mM), the temperature increment of the copper substrates after exposing under a standard sunlight intensity can be up to 67 oC when the solid content of poly(urethane) was quite low.
