Papers by Keyword: Pigment

Abstract: Reflective pigment was prepared by using Fe₂O₃ and Al₂O₃ as starting materials. Fe₂O₃ and Al₂O₃ powders were mixed at 0.8:2, 1:2 and 1.2:2 mole ratio using ball milling. The mixed powders were dried and calcined at temperature of 1500°C, 1600°C and 1700°C for various soaking time at 2, 8 and 20 h. Phase data were analyzed by x-ray diffractometry. It was found that (Al_1-x, Fe_x)₂O₃ presented as a new phase in calcined powders at temperature of 1500°C to 1700°C for 2 h. The other new phase such as FeAl₂O₄ was detected in calcined powders at temperature of 1700°C for 8 and 20 h. From the experimental results indicated that complete reaction was occurred when higher calcination temperature and longer soaking time were used, resulting in spinel structure (FeAl₂O₄) generated. Then, the synthesized powders were mixed with exterior paint by mass ratio of 0:100, 10:90, 20:80, 30:70 and 40:60, respectively. The mixed paints were sprayed on metal sheets. Then the coated metal sheets were exposed under 200 watts lamb and measured the temperature difference between the exposed side and opposite side. The result showed that at the ratio of 30:70 exhibited the highest temperature difference of 14°C approximately. From the result, we concluded that spinel structure (FeAl₂O₄) is a candidate for near-infrared (NIR) reflective pigment of exterior paint.

Abstract: The environment, along with other reasons, is a key factor influencing the living conditions of urban population in Russia today. One of the main drawbacks restraining the process of aesthetic improvement of modern Russian cities is the unsatisfactory protection of buildings from the atmospheric phenomena. Industrial waste, however, is another reason preventing long-lasting decoration of urban buildings. The article presents an overview of the composition and physical properties of masonry paints used in Chelyabinsk Region. The traditional technology of obtaining coatings, e.g. liquid glass, is studied, the drawbacks of this technology are examined, the new applications are offered. The influence of additives on the basic properties of masonry paints, viz. weather resistance, viscosity, hardness, cost, is considered. The application of new technologies utilizing industrial waste can solve the above-stated problem, which also will, along with improving the basic physical and chemical properties, result in reducing the cost and increasing the hardness of masonry paints.

Abstract: The use of titanium dioxide is so diverse that varies from food to heavy industry and it is the main substance in the titanium industry. Over 90% of the world's mined titanium concentrates are processed to produce pigments. The sources for the production of titanium dioxide are the typically used titanium-containing ores including minerals rutile, ilmenite, and others. The volume of world production of titanium dioxide pigment exceeds 5 million tons per year and it is carried out in two ways: sulphate and chlorine (in approximately equal volumes). The changed approach to the green production processes requires the improvement of existing technologies and the development of new methods for processing titanium-containing raw materials. The authors have experimentally confirmed the high efficiency of complex, waste-free processing of titanium-containing raw materials developed by hydrofluoride. Creating pigment production on the basis hydrofluoride method will meet not only the domestic needs but also offer thepigment for export, as its parameters will surpass those of the best world analogues.

Abstract: An innovative two-step route was successfully applied to the ionic liquid-assisted synthesis of C@ZrSiO₄ ceramic pigments, which is able to reduce the reflux time from many hours to a few minutes. The structure and morphology of the inclusion pigments were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). And the chromatic value of the pigments was measured by the CIE color system. The results show that the pigment in the absence of ionic liquid (IL) exhibited homogeneous single t-ZrO₂ phase, while the samples in the presence of IL showed coexistence of two crystal phases (m-ZrO₂ and ZrSiO₄). The CIE coordination L* value decreased with the increase of TEOS amounts due to the pure zircon formation. The as-prepared pigment showed high tinting ability, as L*=37.16, a*=0.71, b*=0.3, making it promising candidate for ceramic decoration.

Abstract: The paper deals with possibilities of application of hydrophobised waterproof walling system for construction of building bottom parts (socle walling) in area with higher risk of floods. The paper describes the results from the research in the field of hydrophobisation possibilities of ceramic shaped pieces and subsequent development of socle waterproof walling construction.

Abstract: The factors influencing the formation of efflorescence of construction materials are connected with the increased solubility of the ingredients of construction materials. Efflorescence may accumulate under some less permeable decorative paint layers and cause their peeling from the surface of a building structure, its decorative properties being completely lost. At the same time, the formation of efflorescence not only as white bloom, but also as "blooming" of the surfaces of materials due to the formation of new chemical compounds is possible. Similar processes occur in the process of operation of coloured pavers manufactured wth vibrocompression of cement and sand mortars with the addition of colouring pigments. The main source of efflorescence is calcium hydroxide Ca (OH)₂ which is formed in hardening cement. The alkaline nature leads to its intensive interaction with carbon dioxide CO₂. This efflorescence in the second year of operation, as a rule, does not resume due to the carbonation of calcium hydroxide in the structure of set cement.

Abstract: The importance of leucoxene concentrates of Yaregskoye deposit as raw materials for pigmental dioxide production is shown in this paper. The technology of thermal activation of leucoxene concentrates is developed and tested in industrial conditions. The offered methods and technologies will allow providing in the long term domestic titanium-containing raw materials the pigmental industry of the Russian Federation.

Abstract: Encapsulated carbon black pigment was prepared by layer-by-layer self-assembly method. The RX8002 carbon black particles were well coated by a SiO₂ layer, which makes it has good connection with ZrSiO₄ layer. Meanwhile, dense ZrSiO₄ layer was coated on the C@SiO₂ particles surface to prevent the corrosive effects of glaze. The structure and morphology of samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The chromatic value of the pigments was measured by the CIE color system. The results show that the carbon black particles can be well coated by SiO₂ and ZrSiO₄ layer. When the TEOS/H₂O ratio is 0.002 and the ZrSiO₄/C ratio is 0.71, the chromatic value of the encapsulated carbon black pigment is 42.55, and the pigment has a good stability in glaze.

Abstract: This study aimed to explore a new perovskite-based color pigment system. The Cr:SrTiO₃ pigments were in the 350 nm range. A solid solution could be obtained at high calcination temperatures as confirmed by both structural and optical characterization. A secondary phase of SrCr₂O₇ was detected at high Cr doping, suggesting a possible complicated nature of Cr species techniques. Shifting of the absorption edge toward the visible range was also observed. The pigments were found to be evenly distributed in the glaze. The synthesized pigment powders were initially brown-maroon and gradually changed to the red and yellow tones when incorporating with the glaze.

Abstract: In this study, the potential of rust as a pigment in paint technology via sintering process was investigated. Iron (III) nitrate was the raw material used to make rust or iron oxide. The characteristics of iron oxide were analyzed. Moreover, iron oxide was mixed with other chemical components to make paint. The properties of paint in both liquid state and solid state were determined by portable field viscometer, pH indicator, glossmeter, pencil hardness test, and tape adhesive test. The optimum ratio of paint components for this study where used iron oxide as pigment. The other properties of pigments and paints will be conducted in the analysis study.