Abstract
This study used immersion and wear experiments to examine the swelling and tribological behaviors of nitrile-butadience (NBR) rubber with three acrylonitrile contents (N18, N26, and N41) in crude oil at varying temperatures. The results showed that in a crude oil medium with increasing temperatures, the N18 volume change rate (VCR) increased linearly, the N41 VCR decreased slightly, and N26 experienced a smaller change. As the temperature rose, the tensile strength and tensile fracture permanent deformation of NBR reduced. As the soaking temperature rose, the NBR wear loss increased and the friction coefficient decreased. When the rubber was soaked in crude oil, swelling gradually spread from the external portion to the internal portion. Due to its compact structure, NBR with high acrylonitrile content exhibited good heat resistance, swelling resistance, mechanical properties, and wearing capacity, but a poor resilience.DOI: http://dx.doi.org/10.5755/j01.mech.22.4.16162
Highlights
The screw pump production system is popular in high viscosity mining due to its flexibility, reliability, strong corrosion resistance, and high volumetric pump efficiency [1]
This study investigates the swelling, mechanical, and tribological behaviors of acrylonitrile-butadiene rubber (NBR) in a crude oil medium under different temperature conditions
The volume change rate (VCR) of N18 and N26 increased in a linear relationship
Summary
The screw pump production system is popular in high viscosity mining due to its flexibility, reliability, strong corrosion resistance, and high volumetric pump efficiency [1]. The swelling resistance, mechanical properties, and wear resistance of stator rubber, the key component of screw pumps, directly affects the service life and performance of crude oil screw pumps. Temperature significantly affects the service life of screw pumps’ rubber stator. Wei et al [8] found that the rubber’s dynamic performance without aging decreased as the temperature increased. Little research has been conducted on the effects of temperature on stator rubber in regards to crude oil medium performance. This study investigates the swelling, mechanical, and tribological behaviors of acrylonitrile-butadiene rubber (NBR) in a crude oil medium under different temperature conditions. It provides a basis for selecting screw pump stator rubber material to prolong the pump’s working life
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