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The results of a study of the weather resistance of protective and decorative organosilicate coatings prepared using organosilicate compositions based on polydimethylphenylsiloxane as a binder and hydrosilicates as fillers are presented. The color of the coatings varies due to the use of pigments: natural FeOx minerals of yellow, red-brown, and brown shades of flowers. Using X-ray phase and X-ray fluorescence (XRF) analysis, it is established that the composition of minerals is primarily determined by iron oxides in the crystalline modification of hematite (α-Fe2O3) and goethite (α-FeO(OH)). Pigments contain a small number of impurity compounds of a number of elements that contribute to the color range of the coatings. Organosilicate coatings are exposed for 11 months in the tropical climate of two climatic zones of Vietnam (in the suburbs of Nha Trang and Ho Chi Minh City). The high corrosion resistance and color stability of the coatings are established during the entire test period. According to slight changes in the color and gloss, revealed by spectrophotometric and photoelectric methods, it is shown that higher resistance to solar radiation and other adverse climatic factors is typical for coatings with a brown pigment based on hematite; and the lowest, with a yellow pigment based on goethite. [ABSTRACT FROM AUTHOR]

The results of a study of the resistance of protective coatings of three compositions to atmospheric corrosion in a humid tropical climate (SR Vietnam) are presented. The process of the biological fouling of coatings in the natural conditions of the South China Sea is studied. Coatings based on cycloaliphatic epoxy resin modified with epoxy rubber with fillers (mica-muscovite, TiO2) are chosen as the objects of research. To improve the anticorrosion and antifouling properties of the coatings, a triethanolamine complex with cobalt(II) cinnamate, which has a pronounced antimicrobial activity, is introduced into their composition. [ABSTRACT FROM AUTHOR]

The color characteristics of organosilicate coatings of various colors are analyzed before and after field tests in Vietnam in a tropical marine climate. The effect of pigments (Cr2O3, SrCrO4, MoCrO4) for color fastness and weather resistance of coatings is demonstrated. [ABSTRACT FROM AUTHOR]

The influence that the composition of coatings based on a cycloaliphatic epoxy resin exerts on their physicomechanical and electrochemical properties was studied with the aim of improving the protective effect of the coatings. Three coating formulations were chosen as investigation objects: without fillers (formulation I), with highly dispersed fillers (muscovite and titanium dioxide, formulation II), and with the same fillers and an organic modifier (epoxy rubber, formulation III). The hardness, adhesion (cross-cut test), contact angle, impact and bending strength, and heat resistance of the materials obtained were determined. Electrochemical trials of the coatings were performed using potentiodynamic polarization. Based on the results of the studies, formulation III containing highly dispersed fillers and epoxy rubber was chosen for further field trials under the conditions of humid tropical climate. [ABSTRACT FROM AUTHOR]

Paint coatings based on a copolymer of vinyl chloride with vinyl acetate with an additive of epoxy-diane resin of six different compositions are developed. The coatings differ in the nature of fillers (anatase, rutile, and cobalt and lanthanum oxides) and the composition of soft biocidal additives of the atrane class (protatrane of salicylic acid and hydrometallatranes based on triethanolamine complexes with zinc(II) and copper(II) salts). The process of biofouling in the natural conditions of the White sea is studied. Fouling communities formed on the studied plates during 2.5 months of exposure to the sea is analyzed, depending on the composition of the coatings. The fouling is based on the attached forms: scyphistomas (polypoid stage) of jellyfish Aurelia aurita and Cyanea sp., mussels Mytilus edulis, and hydroid Obelia longissima. The efficiency of the same paint coating appear to differ towards different species of fouling organisms. [ABSTRACT FROM AUTHOR]

The biostability of silica-organic coatings based on silicone rubber (OS-16-01) and polydimethylphenylsiloxane (OS-51-03M) with and without the addition of a soft biocide based on triethanolammonium of biologically active carboxylic acid (biocide A) is investigated. [ABSTRACT FROM AUTHOR]

A cold hardened organosilicate material for coatings with improved decontamination is developed, which obviates the need for an additional varnish layer on its surface. In terms of its physical and mechanical characteristics and heat resistance (300°C), this coating is not inferior to the currently used OS-51-03 coating. [ABSTRACT FROM AUTHOR]

Sols based on methyltriethoxysilane have been synthesized. These sols were further used to obtain film-forming composites through mixing with aerosil powders of various degrees of hydrophobicity. The effect of ripening of sol-gel systems and the peculiarities of the surface properties of aerosils on the hydrophobicity of coatings produced based on them have been investigated. It has been revealed that a significant effect on hydrophobic and superhydrophobic properties is provided by the degree of hydrophobization of the aerosil surface. For composites with fluorine-containing aerosils, the duration of sol-gel systems aging within 40 days does not significantly affect the properties of the coatings, and the observed deviations are within the measurement errors. [ABSTRACT FROM AUTHOR]

Three compositions based on epoxide-siloxane, epoxide-titanate, modified epoxide-titanate sols have been synthesized by the sol-gel method, and the morphology of surface and the hydrophobicity of coatings obtained on their basis has been studied. According to the results of the studies, the compositions of the coatings have been chosen for the conduction of tests on a rotor of high-rpm miniturbogenerator, with the aim to determine the effect of aerodynamic losses. [ABSTRACT FROM AUTHOR]

Using a sol-gel process, we have prepared bioactive organic-inorganic hybrid coatings based on epoxy siloxane sols modified with detonation nanodiamond. The microstructure of the coatings was studied by scanning electron microscopy. The coatings were tested-under both laboratory and urban conditions-for bioactivity against the mold fungi most frequently encountered in the air in large cities. The results suggest that such coatings are potentially attractive for protecting historic monuments from biodeterioration. [ABSTRACT FROM AUTHOR]

Glass-ceramic composite coatings have been synthesized from doped “silica sol-chromium oxide” sol-gel systems. The physicochemical and electrophysical properties of the coatings have been investigated using thermal analysis, X-ray powder diffraction, electron microprobe X-ray analysis, and atomic-force microscopy. The results obtained have been used to optimize the conditions for the sol-gel synthesis of the coatings and the regimes of their formation. The use of the coatings synthesized makes it possible to substantially improve the performance characteristics of X-ray devices and to increase the output of high-quality products under conditions of commercial fabrication. [ABSTRACT FROM AUTHOR]

The kinetically and sedimentation stable sols were synthesized on the basis of methyltriethoxysilane and additives of polyphenylsilsesquioxane-polymethyl-(3,3,3-trifluoropropyl)siloxane block copolymers and hydrogenated Aerosil. The method of obtaining hydrophobic and superhydrophobic coatings based on the sol-gel compositions was developed. The resulting coatings are transparent; they have got an improved adhesion to glass. [ABSTRACT FROM AUTHOR]