Regulation of electrophysical properties of fireproof polymer compositions filled with hydromagnesite for cable products
DOI:
https://doi.org/10.15587/2312-8372.2019.161856Keywords:
composite materials, ethylene-vinyl acetate copolymer, electrophysical properties of fireproof polymer compositionsAbstract
The level of electrophysical properties of fireproof polymer compositions, depending on the influence of ingredients, has not been sufficiently studied. This is especially true of the effect of the modifier on the properties of the insulation and sheath of cable products. Therefore, the object of research is the electrophysical properties of fireproof composite materials: ethylene-vinyl acetate copolymer, filled with hydromagnesite. Composition of the copolymer with a melt flow index of 2.5 and 5 g/10 min, hydromagnesite with an average median particle diameter of 1.4 μm, aminosilanes with a dynamic viscosity of 2 MPa·s and 2.5 MPa·s are investigated. An isolation test apparatus, an insulation resistance meter, an AC bridge are used. Electrophysical characteristics are obtained, which allow to determine the composition that provides the optimal values for insulating materials and materials of cable sheaths with increased fire safety requirements. The methods of electrophysical studies are used to determine the effect of the properties of the ingredients of polymer compositions on the electrical strength, specific volume electrical resistance, the dielectric loss tangent, and dielectric constant. Electric strength increases when using the polymer matrix EVA-1 and modifier 1 from 21 to 40 kV/mm; when using the polymer matrix EVA-2 and modifier 2 from 22.5 to 42 kV/mm. The specific volume electrical resistance increases significantly for polymer compositions filled with hydromagnesite, using the polymer matrix EVA-1 and modifier 1. Its value increases from 1∙1013 to 6.6∙1014 Ohm-cm. Using the polymer matrix EVA-1 results to reduce the dielectric constant. A significant decrease in this indicator from 4.1 to 3.6 is observed when using modifier 1 with a lower dynamic viscosity (2 MPa s). The tangent of dielectric loss angle also decreases from 0.013 to 0.0046 when using the modifier 1. It is advisable to use the results of the research to develop the composition of fireproof polymer compositions for cable products.
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