The conditions for functionalization of micro- and nanopowders of aerosil, titanium dioxide and diatomaceous earth by wetting them with a liquid hydrophobic agent (tetraethoxysilane) and giving them fobno/philic properties are investigated. Using infrared spectroscopy, derivatography, scanning electron microscopy, and ξ-metry, the mechanism of tetraethoxysilane interaction with the surface of these powders and their morphology were studied. All powders thus modified are characterized by a non-homogeneous distribution of particles with different aggregation levels: predominantly micrometer-sized particle population (diatomaceous earth), micrometer-sized formation combined with nanoclusters (aerosil, titanium dioxide). Diluted suspensions of functionalized powders in fluorinated varnish were used for hydrophobization of glass, aluminum, and steel surfaces. The highest value of the water wetting edge angle (156°) was observed for aluminum coatings obtained using a composition containing functionalized aerosil.

Lamellar microparticles of talc modified with surfactants of anionic (LEUKONOL LBA-2) and cationic (al- kyldimethylamine N-oxide) types were used as a solid stabilizer of the Pickering emulsion of the 2nd kind (water/oil) of the epoxy oligomer. The microstructure of this emulsion, in contrast to that obtained using an unmodified mineral as a stabilizer, is characterized by significant polydispersity, the presence of a higher concentration of drops of 0.08–1 microns in size, as well as the presence of a larger number of colloidosomes with a diameter of 4–30 microns. The good stability of this emulsion is due to the simultaneous formation of a dispersed phase from droplets with a diameter of 0.02–0.04 microns, which have an additional stabilizing effect on it. Such structural differences led to a higher degree of chemical hardening of the emulsion and the formation of coatings with homogeneous morphology and increased physical and mechanical characteristics, which opens up prospects for its use as film-forming agents in the creation of flame-retardant paint materials.

The effect of modifying epoxy polymers with organosilicon compounds and curing with agents containing aminophenol groups on their thermal stability was studied. It was shown that the NPPN-638 epoxy-navolac resin is characterized by the highest thermal stability (50

This paper presents results of a study of photochemical and thermal transformations of ammonium heptamolybdate-modified aluminosilicates. The optical density of UV irradiation-induced molybdenum polyoxometallate species increases with increasing porosity and interlayer spacing in the aluminosilicates in going from the zeolite to bentonite, and their chemical structure and properties are determined by the chemical composition of the ammonium heptamolybdate-containing mixtures and the surface chemistry of the solid matrices. The molybdenum polyoxometallates photoinduced in the structure of the aluminosilicates differ in spectral characteristics from irradiated ammonium heptamolybdate solutions containing the additives used, but offer considerably higher stability. In addition, preliminary UV irradiation of the zeolite containing ammonium heptamolybdate complexes occluded in its pores initiates a thermal transformation of polyoxometallate structures, resulting in the formation of Mo2O3 nanoclusters at 300°C and MoO3 nanoclusters at 700°C. UV irradiation of intercalated bentonite first leads to some expansion of interlayer spaces as a result of the formation of molybdenum polyoxometallate clusters, but subsequent heat treatment markedly densifies the structure, which is accompanied by the formation of molybdenum oxide particles in the temperature range 300–700°C and slight amorphization of the mineral.

The conditions for the formation of a water-in-oil (w/o) Pickering emulsion resistant to coalescence and sedimentation with a droplet size of 2–12 μm, stabilized by talc microparticles were established: the oil phase is a 70

— We have intercalated bentonite using one-step treatment with an ammonium heptamolybdate ((NH 4 ) 6 Mo 7 O 24 ⋅ 4Н 2 O) solution containing citric acid additions and a two-step process that includes exposure to dimethyl sulfoxide vapor in the first step. The d 001 interplanar spacing of the bentonite increased from 16.2 to 21.8 Å in the former case and to 23 Å in the latter. The degree of ammonium heptamolybdate intercalation was then 36–40 wt %. Kaolin intercalation compounds, with d 001 = 10.98 Å (2θ = 7.52°), were only obtained using the two-step process, because of the rigid connection between the structural slabs of kaolin. The degree of intercalation of the precursors into the kaolin structure was 17 wt %, and the intercalation compound was stable up to 220°C.

In this study, the stability of the aqueous dispersions of epoxy oligomers was investigated. The following epoxy oligomers with various numbers of epoxy groups were used for the characterization: NPEL 127, NPEL 128, NPEL 134, NPPN 631, EPOXY 520 and DEG-1. A non-ionic surfactant Emulsogen LCN-287 based on alkyl polyethylene glycol ether was used as an emulsifier. The dispersions of epoxy resins were fabricated by changing the content of a non-ionic surfactant (emulsifier) in a range from 2 to 6 wt.%. It was demonstrated that the stability of aqueous emulsions depends not only on the type of resin, but also on the content of the oil phase and the concentration of the emulsifier. The rheological properties of the aqueous dispersions of epoxy oligomers were investigated as well.

The processes of obtaining compositions based on organosilicon resin for a heat-resistant coating of accelerated drying, as well as its hydrophobization by creating an isotropic nano-microstructure on the surface, are studied. It is shown that the chemical nature, the content of the ingredients and the thickness of the coatings have the greatest influence on the physicochemical properties of heat-resistant coatings. The methods of obtaining a composition for heat-resistant coatings using a dissolver and a bead mill in various modes of operation were studied, which allowed us to develop a technological process for manufacturing heat-resistant paint and varnish material. The composition and technology of obtaining a final hydrophobic layer based on a suspension of aerosil HDK 12H and carbon nanoparticles in a fluorine-containing varnish LF 32LN was developed in order to obtain a complex heat-resistant, superhydrophobic and anticorrosive coating for the protection of metal products and its properties were investigated.

The regularities of changes in the physicochemical properties of the compositions and the resulting coatings of anticorrosive soil from the qualitative and quantitative content of the ingredients included in them are established. It is shown that the chemical nature and concentration of polymer film-forming agents, pigments, fillers and small functional additives, especially those of a nanoscale level, have the great influence on their parameters. The obtained regularities and dependencies made it possible to experimentally justify the selection of components for the primer composition and to develop its preliminary formulation, and the evaluation of the properties of the composition and coatings based on it as a result of testing the manufactured experimental sample made it possible to create its optimal formulation and to produce an experimental batch in the factory. Extended tests of this batch indicate that its physicochemical, technological and operational parameters fully comply with the technical specifications. Experimental studies have also been carried out to study the properties of aqueous dispersions of epoxy oligomers and compositions based on them, which are supposed to be included in the composition of water-dispersed epoxy varnish. The selection of ingredients for its manufacture has been done. So, it was advisable to use a 60-70 % aqueous dispersion of an epoxy oligomer of our own patented composition containing the necessary surfaceactive agents as a film-forming agent, and the commercial product TELALIT 180 as a hardener for it was developed. A technology for applying a complex coating using water-based dispersion, fireproof primers and varnishes, which showed high anticorrosive properties in the protection of metal structures operating in conditions of increased corrosion real danger, has been developed.

The phenomenon of strong stabilization of concentrated aqueous dispersions (emulsions) of polymers by colloidal particles of organic nature (microparticles of synthetic latexes), not accompanied by a significant increase in effective viscosity, opened, firstly, the possibility of carrying out the processes of pigmenting them at low energy costs with a maximum yield (dynamic state, meets the conditions of intensification of heterogeneous chemical-technological processes) and, secondly, determined the directions of further research in this area. So, in contrast to the classical method of emulsion stabilization by mineral microparticles adsorbed directly on the surface of their droplets, microparticles of organic origin interact with them through an interlayer of the dispersion medium, localizing in the immediate vicinity of the dispersed phase and thus maintaining a high mobility of the interphase boundaries. In this regard, the proposed method for predicting the type of emulsions of polymers, taking into account the contact wetting angle and the wetting area of the surface of solid particles of a stabilizer with water and a polymer, requires further verification on various systems. The obtained data of fundamental importance also allowed us to propose new applications of stabilized concentrated artificial latexes for solving applied problems.

The paper studies the wetting of aluminum and glass surfaces with disordered roughness created by technologically simple methods: chemical deposition with simultaneous self-organization of nanoparticles on microprotrusions and valleys, as well as the application of thin coatings using polymer-dispersed systems with polymodal particle size distribution. Super-hydrophobic coatings with an edge wetting angle of 160–170° and a wetting hysteresis of no more than 10° on electrochemically nanostructured aluminum, processed by the dispersion with the polymodal distribution of aerosil microparticles, silicon oxide nanoparticles SiDB and carbon nanocomposite SHDB (Nanosintal, Belarus) in fluorinated varnish. The regularities of changes in the wetting angle of silicate glass with the coating of the same varnish with small additives were established, showing its significant growth with an increase in the content of aerosil microparticles and a decrease in the lacquer concentration. The increase in the content of SiDB and SHDB does not significantly affect the contact angle, but it significantly reduces the hysteresis of its wetting, which gives the glass the effect of “lotus”.

The effect of coalescents of the different chemical composition on the properties of water epoxy dispersions and a hardener, as well as the films obtained from them, is investigated. The type and quantity of coalescent for formation of the coatings which are not conceding on quality to organic analogs is established.

The influence of the regimes of separate stages of the mechanochemical treatment of the aluminum surface including degreasing of the surface with acetone; etching Al in a solution of sodium hydroxide; coarse grinding; chemical polishing in an alkaline glycerol-containing solution; fine grinding; finishing chemical polishing in an alkaline glycerol-containing solution is investigated. These pre-treatment steps allow to optimize the process of obtaining the necessary surface roughness for its subsequent electrochemical nanostructuring. Changes in the structure of the aluminum surface after each stage of preparation were controlled by optical microscopy. Obtained profilograms after the proposed processing of the surface of aluminum indicate getting the roughness parameters necessary for the subsequent nanostructuring of the surface by electrochemical anodizing.

The purpose of the work is carrying out the comparative analysis of methods of receiving compositions on the basis of organic silicon resin for creation of a heat-resistant coating and a research of their physical, chemical s and serviceability properties. The method of a dispersion and influence of a dispersing agent and fillers on process of production and properties of heat-resistant paint on the basis of polyorganosiloxane resin was established. The grinding was carried out in two modes: dispersing mixer and beaded mixing. The mode of a beaded mill gives the increased lathering. It is established that adhesion of a film of paint to steel considerably worsens at a high thickness of a coating. Introduction of a disperser minimizes dependences of adhesion on coating thickness. Dependence of adhesion on the maintenance of an aluminum powder in composition and thickness of coating was established. Selection of components for composition of heat-resistant paint is experimentally reasonable and its compounding is developed. The carried-out assessment of properties of composition of paint and coating on its basis indicates compliance of their main serviceability properties. The received coating composition conforms to requirement for heat-resistant paint. The composition is recommended for applying heat-resistant anticorrosion coatings to the exhaust devices of cars, thermo-furnaces, external surfaces of chimneys, heaters exposed to temperatures in the range of 500-600 °C. properties. The received coating composition conforms to requirement for heat-resistant paint.Forcitation:Kazhuro I.P., Koshevar V.D., Shkadretsova V.G. Methods of pigmentation of polysiloxane resin and heat-resistant coatings on their basis. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 3. P. 77-82

Oxidation of particles of Stapa 4 zinc paste and its composites with Stapa 1515 n. 1 aluminum paste, Silres MSE 100 silicone resin, and microtalc under heating in air was studied by differential-thermal and X-ray phase analyses and electron microscopy. The oxidation of zinc particles starts after a temperature of 330°C is reached, whereas in the presence of Silres MSE 100 resin, the process in which zinc particles are oxidized becomes substantially slower. The oxidation of aluminum particles in the Zn–Al–resin system begins at 560°C. Additional introduction of microtalc shifts the exothermic processes to higher temperatures. A composite was developed for a zinc-aluminum paint to be used to form heat-resistant coatings on metals.

In the course of time, metallic structural systems working in corrosive salt media are in decay under their action. The service life of constructions can be made longer by protection with various primer anticorrosion formulations. For this purpose, a new protective material was developed, an epoxy primer based on ED-20 resin emulsified in water, modified with carbon nanoparticles.

The authors have studied the physicochemical properties of aqueous dispersions containing carbon, silver, and iron nanoparticles which were produced by elastic-spark synthesis under the conditions of subaqueous spark discharge, and also the influence of preliminary acoustic and high-frequency electromagnetic action on them and the change in the functional indices of the glass-ionomer cement tempered by these dispersions.