Solar absorptive coating: a thermally stable spinel pigment based coating with inorganic binder for waterborne paint

Purpose The spectrally selective solar absorption paint is prepared from spinel-based mixed metal oxides with inorganic binder as a key component. Inorganic binder (furnace cement) is blended with mixed metal oxide pigment during synthesis. High temperature stability upto 1,100ºC is achieved by the use of this modified coating system. The purpose of this paper is to work on solar selective coating synthesis, and application of a coating as a water-borne paint is the additive key feature that helps in reduction of solvent use. Design/methodology/approach The paint was formulated using water-based system, and the main component of colorant was made by mixed metal oxide–based spinel pigment and highly temperature stable inorganic binder. Findings The paint formed shows excellent absorptive power with low emittance even at high temperature. Optical and thermal properties were determined along with adhesion, abrasion and other properties. The solar absorptance for these samples were as = 0.93–0.95 with corresponding thermal emittance of eT = 0.096 (at room temperature) and 0.2–0.22 (at elevated temperature 100°C). Originality/value The paint formed shows excellent absorptive power with low emittance even at high temperature. The paint can be applied in solar absorptive tower system. The obtained results indicated excellent thermal stability of prepared paint coatings. As inorganic binder was used, the paint has reduction in solvent use, and being water as a base, it is environment friendly, easy to apply and durable at high temperatures, as the binder itself is stable up to 1,500ºC.

Pozarolnicza działalność gospodarcza w gminach położonych w zasięgu oddziaływania Krakowskiego Obszaru Metropolitalnego

One of economics’ major tasks is the identification of factors that facilitate economic growth. The main purpose of the study was to determine interrelations between selected features of a location, a tax policy implemented by territorial self-government authorities and the intensity of entrepreneurship in gminas [communes] within the range of impact of the Kraków Metropolitan Area (KMA). Based on the analyses which were conducted, in 1995-2016 the number of business entities in gminas bordering directly on Kraków increased faster compared to those located farther away. Reasons for such status quo include the increasing absorptive power of local markets within areas where population density has been increasing as well as migration of entrepreneurs from the core of the KMA to suburban gminas which have improved connections with Kraków. Concurrently, the gminas with more advantageous locations relative to the regional economic center implemented a more restrictive tax policy and aimed to take over, in the form of local taxes, a part of entrepreneurs’ location rent.

Synthesis of Acrylic High-Oil Absorption Resins

Through suspension polymerization , the influences of different crosslinking agent, initiator, disperser and reaction temperature on oil absorption rate of cetane methacrylate highly oil absorptive resin were studied. The oil absorption ability of the resin for different oil was investigated. The results show the oil absorption capacity of synthesized resins was good with crosslinker divinylbenzene(DVB), initiator benzoyl peroxide(BPO) and disperser polyvinyl alcohol(PVA). Suitable process conditions were: crosslinker DVB 1.0%, initiator BPO 1.2%, disperser PVA 0.8%, reaction temperature 70°C, and oil absorptive power of obtained resin is about 36.6g.g-1 for CC14.