Comparative Studies on the UV Radiations Resistance of Some Painting Materials

Rus, Traian; Lıngvay, Iosif; Caramitu, Alina Ruxana; Bors, Adriana Mariana; Vaireanu, Danut-Ionel

doi:10.37358/mp.17.4.4931

Cited by 14 publications

(14 citation statements)

References 19 publications

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“…The enzymatic apparatus of the microorganisms and their metabolic products produce the polymeric materials biodegradation [20][21][22] with implications on the durability of various construction systems such as: corrosion protection with polymeric protective layers [2][3][4][23][24][25], underground plastic pipelines [26,27], underground power cables [28][29][30], etc.…”

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confidence: 99%

Ageing of Some Lacquers Due to Microbiological Stress

Bors¹,

Lungulescu²,

Nicula³

et al. 2019

Mat.Plast.

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This paper shows the ageing study of some coatings and / or impregnation lacquers due to microbiological stress through fungal attack. Dielectric spectroscopy has shown that the dielectric losses of the investigated materials increase as result of microbiological ageing. The mean recorded increases are about 4 times for the alkyl-epoxy-melamine copolymer, 2 times for epoxy polymer and 1.5 times for urethane polymer in agreement with the mould coverage degree of about 20 %, 10 %, and 3 %, respectively. The fungal attack of the investigated polymers led to a decrease in volume resistivity of about 65 % for the alkyl-epoxy-melamine copolymer, 45 % for the epoxy polymer, and 14 % for polyurethane, in agreement with the increase of dielectric losses and degree of mold coverage of the samples. FTIR determinations have shown that fungal attack significantly increased the number of aliphatic -OH and C-H bonds and decreased the number of C-O bonds, respectively of C-O-C oxiran groups and C-C aromatic bonds. DSC thermograms recorded at different temperature ranges and the activation energies calculation for first major oxidation process indicate that after the fungal attack the thermooxidative reactivity of the investigated polymers increases.

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confidence: 99%

Ageing of Some Lacquers Due to Microbiological Stress

Bors¹,

Lungulescu²,

Nicula³

et al. 2019

Mat.Plast.

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“…The degradation/ageing of painting materials under the influence of environmental factors (humidity, temperature, presence of oxygen, etc.) occurs through complex thermo-oxidation processes [71][72][73][74][75][76][77].…”

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confidence: 99%

Studies on the Behavior Some Paints in Electro-insulating Fluid Based on Vegetable Esters

Lıngvay¹,

Bors²,

Ungureanu³

et al. 2018

Rev. Chim.

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For the purpose of using three different types of painting materials for the inner protection of the transformer vats, their behavior was studied under actual conditions of operation in the transformer (thermal stress in electro-insulating fluid based on the natural ester in contact with copper for electro-technical use and electro-insulating paper). By comparing determination of the content in furans products (HPLC technique) and gases formed (by gas-chromatography) in the electro-insulating fluid (natural ester with high oleic content) thermally aged at 130 �C to 1000 hours in closed glass vessels, it have been found that the presence the investigated painting materials lead to a change in the mechanism and kinetics of the thermo-oxidation processes. These changes are supported by oxygen dissolved in oil, what leads to decrease both to gases formation CO2, CO, H2, CH4, C2H4 and C2H6) and furans products (5-HMF, 2-FOL, 2 -FAL and 2-ACF). The painting materials investigated during the heat treatment applied did not suffer any remarkable structural changes affecting their functionality in the electro-insulating fluid based on vegetable esters.

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“…This ageing occurs further to the interaction of these materials with their working environment and, also, as a consequence of the interaction between different materials. Thus, the degradation of the paint coatings applied on metallic parts (under the direct action of the different environment factors [13][14][15][16][17] including the microbiological factors [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]) leads to * email: adrianambors@gmail.com; Phone: 0773917319 corrosion of these metallic parts -in some extreme cases, to the irreversible damage of the steel electrical pillars [33] or of the reinforced concrete electrical pillars [34][35][36][37].…”

mentioning

confidence: 99%

Ageing of Some Painting Materials Subjected to Thermal Treatment in Natural Esters

Rus¹,

Caramitu²,

Ungureanu³

et al. 2018

Mat.Plast.

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This paper describes the evaluation of the aging process of some polymeric painting materials subjected to a thermal treatment in electro insulating fluids, based on natural esters (vegetable oils). The paint layers surface morphology was comparatively characterized by FESEM technique, prior to the exposure, and after 1000 h of exposure to vegetable oil, heated at 130oC. The results show a substantial increase in the pulling resistances for all the painting materials subjected to this investigation, especially in the presence of the Kraft insulating paper and copper foil (inserted compulsory to emulate the actual working environment), due to an increase in the painting material adhesion, as well as an increase of the tensile strength of the paint layer. These findings may open new theoretical and practical research prospects, particularly in the field of preliminary treatments for materials used for heavy duty industrial transformers.

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Comparative Studies on the UV Radiations Resistance of Some Painting Materials

Cited by 14 publications

References 19 publications

Ageing of Some Lacquers Due to Microbiological Stress

Ageing of Some Lacquers Due to Microbiological Stress

Studies on the Behavior Some Paints in Electro-insulating Fluid Based on Vegetable Esters

Ageing of Some Painting Materials Subjected to Thermal Treatment in Natural Esters

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