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Behaviour of varnish composite in various environmental condtions
Kadlec, Michal ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
The diploma thesis is focused on the preparation of test samples of paint-filled micronized mica and analysis of electrical properties of insulating material values in different environmental conditions. For this purpose, it was created five sets of composite paint primers with different ratio of mica. Samples were gradually exposed to the environment relative humidity of 0%, 33%, 55%, 65% and 75%. For each environment with a defined moisture characteristics were observed in samples exposed to the temperature of 20 to 50 ° C. The diploma paper analyzed the influence of the mass implementation of mica in each set of samples and placed on the surface structure of samples.
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Impact of the climatic conditions upon the varnishes properties
Mikoláš, Jiří ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This bachelor's project analysis influence of moisture absorption on dielectric properties of composite material, which was exposured various relative humidity. The composite material consist of epoxide varnish EPOXYLITE TSA 220S by company Epoxylite Ltd. with various weight percentage number micro-ground mica. This experiment was carried out by dielectric relaxation spectroscopy with frequency range from 100 Hz to 1 MHz. Elementary results of this project are composite material frequency dependencies of component part of complex permittivity.
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Mica modified electroinsulating varnishes
Mrkos, Pavel ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This master´s thesis deals with influence of mica content on the electrical properties of electrical insulating varnishes, particularly in the polyester resin Dolphon XL 2102. It focuses on diagnostic methods and testing the properties of electroinsulating varnishes. Examines the potential benefits of micronised mica in order to achieve better electrical insulation properties of the system compared to the matrix. The composite material consists of polyester resin Dolphon XL 2102, which is modified different mass percentage of micronized mica. The results of this project are frequency dependencies of real and imaginary parts of complex permitivity of varnish component.
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Modification of electroinsulating varnish with ground mica
Drápal, Aleš ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This master's thesis focuses on composite systems based on varnish combined with different filler ratios of micronized mica. The aim is to analyse impact of the filler on dielectric properties of the varnish, i.e. relative permittivity and loss factor as functions of frequency as well as charging and discharging currents as functions of time. Dielectric mixture formulas are applied on relative permittivity values. Calculated and measured values are compared.
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Study of electric properties of composite
Macháček, Miroslav ; Havlíček, Svatopluk (referee) ; Polsterová, Helena (advisor)
This work deals with issues of composite materials. The general aim is to observe how the amout of filling infuence dielectric spectrum which is measured on prepared samples. For this purpose had been created variety of a samples with different percentage of filling with mica. Measured values had been compared with theoretically values, determinated using mixture formulas.
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Dielectric Properties of Thermoplastic Materials with Ground Mica
Fiala, Ivo ; Havlíček, Svatopluk (referee) ; Polsterová, Helena (advisor)
The subject of this thesis are composite materials, measuring of their dielectric qualities, particularly of the polyamide and the polyamide filled with various weight percentage of the ground mica. The essential intent of the thesis is to determine the measuring methodology and respective measurement of the basic dielectrical quantities of materials, as are loss factor and the complex permitivity components. The measuring should be done for various temperature and humidity combinations. The thesic contains the physical explanation of measured dependences.
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Application of mica based pigments
Štengl, Václav ; Kalendová, A. ; Trojan, M.
Properties of sandwich pigments based on mica coated with metal oxide layers are described. Various mica types were characterized and used for pilot plant scale synthesis of pigments. Paints containing this kind of pigments were formulated and tested anticorrosive coatings. Synthesis and characterization of some thermally stable pigments based on mixed metal oxides is also described.
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