Modeling the Optimal Composition of Structural Epoxy Composites Filled with Dispersed Metal Waste

2020 ◽  
Vol 864 ◽  
pp. 250-256
Author(s):  
Vladimir Lebedev ◽  
Tetiana Tykhomyrova ◽  
Oleksii Shestopalov ◽  
Olexiy Troshin ◽  
Tamara Melnik
Keyword(s):  
Solid Phase ◽  
Strength Properties ◽  
Epoxy Composites ◽  
Optimal Composition ◽  
Highly Active ◽  
Metal Waste ◽  
Metal Wastes

Processes of modeling the optimal composition of structural epoxy composites filled with dispersed metal waste are investigated in the article. The influence character of dispersed metal wastes introduction on the operational and strength properties of cold-cured structural epoxy composites is shown. A model for predicting the operational and strength properties of structural epoxy composites depending on dispersed solid phase of metal waste content and a highly active accelerator in them is designed.

From recovered metal waste to high-performance palladium catalysts

2017 ◽  
Vol 19 (24) ◽  
pp. 5846-5853 ◽  
Author(s):  
Khairil A. Jantan ◽  
Chuek Yee Kwok ◽  
Kuang Wen Chan ◽  
Luciano Marchiò ◽  
Andrew J. P. White ◽  
...  
Keyword(s):  
Palladium Catalysts ◽  
High Performance ◽  
Palladium Complexes ◽  
Catalytic Converters ◽  
Highly Active ◽  
Metal Waste

Molecular palladium complexes, recovered selectively from used catalytic converters, can be directly valorised as highly-active catalysts for C–H oxidative functionalisation.

scholarly journals PROPERTIES OF EPOXY COMPOSITES CURED BY A COMPLEX OF ORGANIC TIN HALIDE WITH AN AMINOPHENOL HARDENER

2020 ◽  
Vol 5 (11) ◽  
pp. 89-101
Author(s):  
Y. Kochergin ◽  
A. Nosova ◽  
T. Kravchuk ◽  
T. Grigorenko ◽  
V. Zolotareva
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Water Environment ◽  
Strength Properties ◽  
Epoxy Composites ◽  
Antifouling Coatings ◽  
Hydraulic Equipment ◽  
Deformation Ability ◽  
Low Exposure

A method for the synthesis of a complex based on an organic tin halide – dibutylol dibromide – and a aminophenol hardener of the UP-583 brand has been developed. It is found that samples cured with a complex hardener at room temperature are characterized by lower values of tensile strength, elastic modulus and glass transition temperature compared to samples cured with the original hardener UP-583. The values of strain at break are approximately the same for both hardeners. After heat treatment, the strength and modulus values for samples containing the complex sharply increase, as a result of which they are superior to samples based on UP-583. The deformation capacity does not change much, the glass transition temperature increases after heating, but remains significantly lower than for samples cured with the original UP-583. The observed change in the deformation and strength properties of samples during their exposure in a liquid medium is explained by the superposition of the effects of plasticization and re-hardening of epoxy polymers. At low exposure times, the action of the sorbed moisture is mainly aimed at weakening the intermolecular interaction in the sample. In result, its strength decreases and deformability increases. At large values of exposure times, when the amount of sorbed water becomes sufficiently large and a fairly intense molecular mobility develops, pre-hardening processes prevail, leading to an increase in the cross-linking density and, to a decrease in the deformation ability and an increase in the strength index. It is shown that epoxy composites containing a complex hardener are characterized by good performance in the water environment, increased resistance to the development of fungi and mold, as well as better fire resistance. The studied polymers are promising for obtaining antifouling coatings based on them for hydraulic equipment, sea and river vessels.

scholarly journals Development and Analysis of the Physicochemical and Mechanical Properties of Diorite-Reinforced Epoxy Composites

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2421
Author(s):  
Amirbek Bekeshev ◽  
Anton Mostovoy ◽  
Yulia Kadykova ◽  
Marzhan Akhmetova ◽  
Lyazzat Tastanova ◽  
...  
Keyword(s):  
Gas Phase ◽  
Thermal Destruction ◽  
Epoxy Polymer ◽  
Epoxy Composite ◽  
Chemical Interaction ◽  
Strength Properties ◽  
Epoxy Composites ◽  
Mineral Filler ◽  
Pyrolysis Products ◽  
Thermal Stability Of

The aim of this paper is to study the effect of a polyfunctional modifier oligo (resorcinol phenyl phosphate) with terminal phenyl groups and a dispersed mineral filler, diorite, on the physicochemical and deformation-strength properties of epoxy-based composites. The efficiency of using diorite as an active filler of an epoxy polymer, ensuring an increase in strength and a change in the physicochemical properties of epoxy composites, has been proven. We selected the optimal content of diorite both as a structuring additive and as a filler in the composition of the epoxy composite (0.1 and 50 parts by mass), at which diorite reinforces the epoxy composite. It has been found that the addition of diorite into the epoxy composite results in an increase in the Vicat heat resistance from 132 to 140–188 °C and increases the thermal stability of the epoxy composite, which is observed in a shift of the initial destruction temperature to higher temperatures. Furthermore, during the thermal destruction of the composite, the yield of carbonized structures increases (from 54 to 70–77% of the mass), preventing the release of volatile pyrolysis products into the gas phase, which leads to a decrease in the flammability of the epoxy composite. The efficiency of the functionalization of the diorite surface with APTES has been proven, which ensures chemical interaction at the polymer matrix/filler interface and also prevents the aggregation of diorite particles, which, in general, provides an increase in the strength characteristics of epoxy-based composite materials by 10–48%.

scholarly journals THE STUDY OF THE FUNCTIONAL FEATURES OF THE SYNTHESIZED ALUMINUM-NICKEL-MOLYBDENUM HYDROTREATING CATALYSTS

2020 ◽  
pp. 275-279
Author(s):  
Ozoda Abdullaevna Salikhova ◽  
Shakhzod Murodovich Makhmudov ◽  
Miraziz Solikh ogli Zokirov
Keyword(s):  
Solid Phase ◽  
Raw Materials ◽  
Catalyst Activity ◽  
Chemical Properties ◽  
Oil Refining ◽  
Mineral Oils ◽  
Mo Catalyst ◽  
Highly Active ◽  
Functional Features ◽  
Activation Conditions

The process of hydro-desulfurization of various mineral oils, which play a big role in the modern oil refining technology, continues to improve intensively and its value increases. Despite the fact that nowadays, hydro treating is one of the largest catalytic processes in the modern oil refining industry, the power of hydro desulfurization in the world is estimated as 950 million tons a year. So, it can be concluded that the study of hydro treating catalysts, the chemistry of hydro-desulfurization processes are the high priority tasks leading to the technological solving of the problem of hydro treating process. Moreover, it is also necessary to study other major issues related to the hydro treating process: study of the interaction between active metals and carriers; reactions in the solid phase as swell as issues of oxide reduction or their conversion to sulfides. The determination of the surface state in equilibrium conditions, the amount of the coke deposits, the stoichiometry of the catalysts, its changes during activation and regeneration during catalytic process. This article outlines the development of the production of highly active aluminum-nickel-molybdenum catalysts for hydro treating distillate raw materials, improving its physical and chemical properties and activity by modification of the carrier and by studying of the influence of activation conditions. KEYWORDS: hydrogenation activity, sulfurization of Al-Ni-Mo catalyst, activity of the catalyst, thiophene hydrogenolysis.

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