Papers - Archive

Nr 2/2015 - Abstracts

Elastomery nr 2/2015 cover

Kablov Victor Fedorovich, Zaikov Gennady Efremovich

Application of polycondensation capable monomers for production of elastomeric materials working in extreme conditions

The research is devoted to creation of elastomeric compositions based on systems with functionally active components for extreme conditions. The use of polycondensation capable monomers (PCCM) and other compounds with reactive groups was proposed for generating the stabilizing physical and chemical transformations. Thermodynamic analysis of open polycondensation systems and substantiation of various PCCM application as functionally active components of elastomeric materials have been conducted; research results of polycondensation in an elastomeric matrix have been represented and a possibility of improving heat and corrosion resistance of elastomeric materials with introduction PCCM has been shown; different ways of applying PCCM have been proposed and experimentally proved.

Paulina Bednarczyk, Zbigniew Czech, Adrian K. Antosik

Gloss measurement of UV-curable urethane acrylate varnishes

Photocurable varnishes based on urethane acrylates can be use in various industries. They are characterized by both very good resistance to external factors and have decorative properties. One characteristic of these properties is the gloss, which determines the ability of the surface to the directional reflectance of light, which is falling on it. Lacquer coatings are not reflective surfaces and wave light falling on the surface is partially reflected or penetrates the coating. The intensity of the reflected radiation depend on the type of coating. This paper presents a study on the impact of photoinitiator for a gloss of varnish based on urethane acrylates. The optical properties of the coatings are usually determined by visually test comparing the surface with a reference. The use of instrumental methods greatly increases the accuracy and sensitivity of tests. In the case of studies described below, the glossmeter GLS was used, in accordance to the standards ISO 2813, ASTM D 523 and DIN 67530.

Elżbieta Piesowicz, Izabela Irska, Zbigniew Rosłaniec

Unconventional systems based on EPDM rubber for technical applications

Rubber compounds based on EPDM rubber with different content of carbon black and plasticizers: paraffin oil and chloroparaffin were obtained. Mechanical properties (hardness, tensile strength and elongation at break) of obtained vulcanizates were studied. The most promising systems were exposed to accelerated ageing tests. On the basis of dielectric loss and relative dielectric permittivity measurement tested systems were evaluated in the context of their use as insulating materials for railway and tram traction drive construction.
Unconventional introduction of polar plasticizer (chloroparaffin) to the non-polar rubber (EPDM) induce its diffusion to the insulation surface. This provides additional sealing between insulation and suspension rod. Plasticizer diffusion is reproducible and act as good protection against the harmful effects of climate.

Marta Tomaszewska, Aleksandra Hassa-Żałoba, Jan Mężyński, Dariusz M. Bieliński

Rubber mixes and rubber with devulcanized rubber powder. Part 1. Technical rubber mixes and their vulcanizates

Rubber mixes made of styrene-butadiene rubber (SBR) and/or natural rubber (NR), applied for production of technical rubber goods, were modified by a partial replacement of rubber with a commercial devulcanized rubber powder of micronized particles. The replacement was accompanied by a simultaneous changes to the composition of rubber mixes, indispensable for maintaining their processing parameters and exploitation characteristics of the vulcanizates. Devulcanized rubber powder of micronized particles was introduced to rubber mixes, used for the production of tire treads, solid rubber wheels and technical rubber foods, without other additional modification.
The results obtained point out the possibility for replacement of rubber with the rubber powder in the standard rubber mixes based on NR and/or SBR up to 20 phr, without any significant deterioration of their properties. Such mixes can be successfully applied as materials for the production of solid rubber wheels. Incorporation of higher amounts of the rubber powder leads to difficulties in processing and makes mechanical strength of the vulcanizates decreased, what limits their use to cheaper substitutes in less demanding applications.

Krzysztof Potocki, Michał Lewandowski

Influence of furnace black modification on physical properties of polar and nonpolar rubber

Strength properties of SBR and NBR vulcanizates filled with modificated and unmodificated furnace carbon black were investigated. Modification was carried out by use of silane containing polar amine groups. As a result of modification reinforcement effect of modificated carbon black mixed with NBR rubber was found.

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