The results of the research of the resistance of reinforced polymeric composite materials to hydro-abrasive action are presented. Hydro-abrasive wear research was carried out on a specially developed device that makes it possible to study the wear resistance of materials and coatings under impact conditions of loosely suspended abrasive particles simulating the flow of a hydro-abrasive medium. Composites based on polyester resin and polyurethane reinforced with ultra-high molecular weight polyethylene (UHMWPE) fibers and glass fibers were chosen as the objects for the study. An analysis of the intensity and nature of wear of these composites in compared with structural steel, UHMWPE and polyurea was carried out.The analysis of the obtained research results shows that UHMWPEis the most resistant to hydro-abrasive effects. However, the high cost and variation of the traditional technology of manufacturing composite products using UHMWPE as a lining material shows the advantage of using composite materials reinforced with oriented UHMWPE fibers.
Electrically conductive rubber on the basis of tyre regenerate and conductive carbon black (OMCARB CH85) is developed. It is shown that an increase in conductive carbon black concentration leads to an increase in tensile strength and Shore A hardness of the tyre regenerate. However, due to insufficient dispersion of carbon black, a decrease in relative elongation and resistance to abrasive wear is observed. A study of volume resistivity showed that the obtained rubbers are semiconductor materials. Dependence of specific resistance on temperature in a range from 10 to 80°C is constructed. It is shown that the effect of positive thermal coefficient is observed in all obtained samples.
The possibility of developing conductive rubber based on tire regenerate and conductive carbon black OMCARB CH85 is shown. The vulcanizing characteristics of the regenerates obtained by thermomechanical devulcanization using a curing group and conductive carbon black were studied. It is shown that, after thermomechanical devulcanization, a re-vulcanization due to preservation of sulfide bonds occurs only in the presence of sulfur and vulcanization accelerators. A flocculation effect was found upon the introduction of OMCARB CH85 into the regenerate. It is shown that tensile strength and Shore A hardness are increased with an increase in the content of conductive carbon black in the regenerate. However, owing to insufficient dispersion, the carbon black admixture exceeding the optimum quantity results in a decrease in maximum relative elongation at break and diminished resistance to abrasion is observed. The study of the volume resistivity showed that the rubbers obtained belong to semiconductor materials. The dependence of resistivity on temperature in the range from 10 to 80°C is plotted. It is shown that the effect of a positive thermal coefficient is observed in all samples. The values of the positive temperature coefficient of resistance in the temperature range of 10-80°C are 0.054-0.285 K -1 .
The possibility of developing conductive rubber based on tire regenerate and conductive carbon black OMCARB CH85 is shown. The vulcanizing characteristics of the regenerates obtained by thermomechanical devulcanization using a curing group and conductive carbon black were studied. It is shown that after thermomechanical devulcanization, preservation of sulfide bonds, re-vulcanization occurs only in the presence of sulfur and vulcanization accelerators. A flocculation effect was detected upon the introduction of OMCARB CH85 into the regenerate.It is shown that tensile strength and Shore A hardness are increase with an increase in the content of conductive carbon black in the regenerate. However, there is insufficient dispersion of carbon black, a decrease in elongation at break and resistance to abrasion is observed. The study of volume resistivity showed that the resulting rubbers belong to semiconductor materials. The dependence of resistivity on temperature in the range from 10 to 80 °C is constructed. It is shown that the effect of a positive thermal coefficient is observed in all samples. The values of the positive temperature coefficient of resistance in the temperature range of 10 – 80 °C are 0.054 – 0.285 deg–1.
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