Effect of chain extender content on tribological properties of polyurethane under water-lubrication

Polyurethane has been extensively studied as a multifunctional material for water-lubricated bearing materials. As one of the polyurethane elastomeric synthetic material, the content of 4,4 & PRIME;-methylene bis(2-chloroaniline) (MOCA) directly affects the intermolecular structure and thus the properties of the material. Five samples with different MOCA contents were prepared by casting molding and tested. The results showed that the optimal comprehensive performance was obtained when the ratio of the amino group to the hydrocyanic acid group was 0.95, with tensile, compressive, and bending strengths of 50.1, 91.8, and 12.6 MPa, respectively. Compared with other samples, the surface of the sample was smooth, which was conducive to the formation of the water film. The bearing capacity and lubrication condition are improved, and the best tribological performance was shown. This research for the application of polyurethane elastomer on the water-lubricated bearing provides a theoretical basis.

Automated summary

Polyurethane has been studied extensively as a multifunctional material for water-lubricated bearings, and the content of MOCA directly affects its properties. Five samples with different MOCA contents were prepared and tested, showing that the optimal performance was obtained with a specific ratio. The research provides a theoretical basis for the application of polyurethane elastomer in water-lubricated bearings.