Optimization of the Composition and Regime of Heat Treatment of Elastomeric Nanocomposite for Restoring Worn Out Car Body Parts

Abstract

Methods of restoration with polymeric materials significantly increase the post-repair resource of housing parts, bearing assemblies, shafts and gears. Studies of filling elastomers with carbon nanotubes are of great scientific and practical interest in order to develop a promising nanocomposite for restoring car body parts. Investigated the influence of carbon nanotubes “Taunit-M” and the mode of heat treatment on the deformation and strength properties of the elastomer F-40S. The deformation and strength properties of unfilled F-40S elastomer and composites based on it were investigated using the methods GOST 14236-Sl and GOST 12423-66 using original equipment and samples. Testing of samples on a tensile testing machine IR 5082-50. An active experiment on the compositional plan B2 was carried out and a regression model of the dependence of the specific work of nanocomposite samples on the temperature and time of heat treatment was obtained. The used mode of two-stage heat treatment in which the response function has a maximum value of $35.0\ {\mathrm {MJ/m}}^{3}$ has been determined. The first stage of heat treatment: temperature $55^{\circ}\mathrm{C}$, time 1 hour. Second stage: temperature $150^{\circ}\mathrm{C}$, time 2 hours.The study of the dependence of the deformation-strength properties of the nanocomposite on carbon nanotubes has been carried out. As a result, the composition of the F-40S elastomer nanocomposite was determined: F-40S elastomer- 100 parts by weight, Taunit-M carbon nanotubes- 0.1 parts by weight. The new nanocomposite, in comparison with the non-filled elastomer F-40S, has higher consumer properties: the strength of the material increased by 32 %, deformation - 1.66 times. The specific work increased by 82 %, which indicates a higher endurance of the material and conditions for an increase in the durability of remanufactured bearings. An increase in the modularity of the nanocomposite in comparison with the unfilled F-40S elastomer by 59% will reduce the flexibility of the restored support under radial loading of the bearing, eliminate the displacement of the bearing axes relative to the axle hole, and increase the maximum permissible thickness of the polymer coating of the housing parts. A promising elastomeric nanocomposite for restoring body parts of automotive vehicles has been developed.