Oka Ryohei, Iwasaki Senri, Masui Toshiyuki
Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University 4-101, Koyama-cho Minami Tottori 680-8552 Japan.
Faculty of Engineering, Tottori University 4-101, Koyama-cho Minami Tottori 680-8552 Japan
RSC Adv. 2019 Nov 28;9(66):38822-38827. doi: 10.1039/c9ra07849e. eCollection 2019 Nov 25.
Inorganic black pigments with thermal barrier characteristics, CaMn TiZn O (0 ≤ ≤ 0.10), were synthesized using a conventional solid-state reaction method in order to improve the blackness without decreasing the near-infrared (NIR) reflectance of a CaMnTiO pigment, which was previously reported by our group. The composition was optimized to provide both high blackness and NIR reflection characteristics. As a result, the NIR solar reflectance value ( ) of CaMnTiZnO ( = 74.6%) became larger than that of CaMnTiO ( = 71.7%), and the black color tone of the former (* = 23.2, * = +2.81, * = +0.83, = 2.93) was improved in comparison with that of the latter (* = 24.4, * = +4.30, * = +2.72, = 5.09). This improvement is caused by the introduction of strain into the [MnO] octahedra and a decrease in the manganese ion concentration. The value of the CaMnTiZnO pigment was also larger than those of the commercially available pigments ( < 53.0%). Therefore, CaMnTiZnO has potential to be an inorganic black pigment for thermal shielding.
为了在不降低本课题组之前报道的CaMnTiO颜料近红外（NIR）反射率的情况下提高其黑度，采用传统的固态反应法合成了具有热障特性的无机黑色颜料CaMnTiZnO（0 ≤ ≤ 0.10）。对其成分进行了优化，以同时提供高黑度和近红外反射特性。结果，CaMnTiZnO（ = 74.6%）的近红外太阳反射率值（ ）大于CaMnTiO（ = 71.7%），并且与后者（* = 24.4，* = +4.30，* = +2.72， = 5.09）相比，前者（* = 23.2，* = +2.81，* = +0.83， = 2.93）的黑色调得到了改善。这种改善是由于[MnO]八面体中引入了应变以及锰离子浓度降低所致。CaMnTiZnO颜料的 值也高于市售颜料（ < 53.0%）。因此，CaMnTiZnO有潜力成为一种用于热屏蔽的无机黑色颜料。
