The paper presents the results of studies on surface modification of finely dispersed tungsten (IV) dioxide with polyethylsiloxane from a solution of n-hexane with the aim of its compatibility and the possibility of uniform distribution in the volume of the nonpolar polyimide matrix. The energy dispersive interaction of the press powder of polyimide and highly dispersed modified WO2 in a jet-vortex mill allowed for the activation of their surface, as well as high uniformity of distribution of the filler in the polyimide matrix and excluded the possibility of the formation of agglomerates. It is shown that the use of modified WO2 increases the degree of filling of the polymer composite by 15-20% and the increase in the density of the composite by 16.0%.
Glaze compositions are obtained based on slime from acid sewage regeneration at the Dyat'kovskii Crystal Works, and the technology of producing tinted glass ceramic coatings for facade brick is developed. The main physicotechnical and color characteristics of considered glazes are presented.Contemporary construction industry has a wide range of strong wear-resistant and durable facade ceramic products for public and residential buildings. However, in a market economy when supply exceeds demand a consumer gives preference to materials that combine diverse structural-texture specifics and coating colors. Such decorative properties can be achieved by varying the heat treatment procedure and the redox condition of synthesis and firing [1], as well as by using the controlled crystallization method involving titanium-bearing components [2]. At the same time, several other urgent problems can be solved: utilization of constantly accumulating industrial waste that is toxic for the ambient medium, expansion of the list of available materials for the glass industry, and assisting the commercial activity of companies.The purpose of the present study is to develop decorative glass coatings for facade ceramics based on a frit containing a resource-saving component, namely, slime of acid sewage regeneration from the Dyat'kovskii Crystal Works.For the synthesis of glass coatings we chose the system SiO 2 -Al 2 O 3 -B 2 O 3 -Na 2 O, which is one of the main systems for producing white enamels and(or) glazes with different degrees of opacification and luster. Considering a substantial glass-formation area in the specified system [3], the weight contents of SiO 2 , Al 2 O 3 , B 2 O 3 , and Na 2 O were constantly maintained at 50.0, 3.0, 9.5, and 15.5%, respectively, while varying the RO : TiO 2 ratio, which is the deciding factor in the formation of dull and(or) transparent coatings ( Table 1).The initial materials for melting glazes were quartz sand VS-030 (GOST 22551-77), alumina, boric acid, soda, titanium white, and acid sewage regeneration slime from the Dyat'kovskii Crystal Works. Slip was prepared using bentonite clay, technical borax, and color pigments 16/4744, 10/185, 12/350, 11/201, 18/995, and CuCl 2 produced by Intercolor (Italy).Glasses were melted in a laboratory electric furnace in alundum crucibles of capacity 100 cm 3 at a temperature of 1300°C exposing the melt for 30 min at the maximum temperature. Melted glass was granulated in water.Slip was prepared by moist grinding of components in a ball mill to a residue of 0.1% on a No. 0063 sieve. To produce glass coatings, a slip of moisture 53 -68%, density 1480 -1730 kg/m 3 , and flow rate of 14 -18 sec from a viscosimeter of diameter 4 mm was deposited on the facade surface of a ceramic substrate (red facade brick) by casting. Coatings were dried at 120 ± 5°C, firing was performed in a SNOL-1 electric laboratory furnace in a temperature interval of 900 -1150°C for 15 min.All coatings had good strength of adhesion to the substrate. At the same time the quality, colo...
The paper presents the possibility of producing polyhedral oligomeric silsesquioxanes (POSS) under hydrothermal conditions in a high-pressure reactor. POSS was prepared by hydrolytic polycondensation of cyclohexyl trichlorosilane under conditions of elevated temperature and pressure. Morphology and structure of the final products were characterized by X-ray diffraction (XRD), thermal analysis (TGA and DTA) in an atmosphere of argon, Fourier transform infrared spectrum (FT-IR) and scanning electron micrograph (SEM). The resulting compound is a nanofibers of a polyhedral oligomeric silsesquioxane. The diameter of the obtained nanofibers is 50 … 150 nm, and the length is from 200 nm to 30 μm.
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