Abstract:

Organic-inorganic hybrid polyurethane composites with excellent heat-resistance were synthesized via reaction of toluene-2,4-diisocyanate(TDI) prepolymer, 3,3-dichloro-4,4-diamino diphenylmethane(MOCA), aminopropyl triethoxysilane(APTEOS) and tetraethoxysilane(TEOS). Molecular structures and properties of the material were characterized by IR, TGA, friction tester and hardness analyzer. Thermal stabilities of the composites were greatly improved due to the introduction of the Si—O networks into the molecules. These materials show rather low friction coefficient(about 0.001 as speed higher than 200 r/min) and appropriate hardness(shore 92 A) for water-lubricated bearings application. The results confirmed that the organic-inorganic hybrid polyurethane composites prepared in this work were reliable for water-lubricated bearings production due to the excellent performances of wearability, high loadability and easy processibility.

Key words: polyurethane, silane coupling agent, sol-gel method, organic-inorganic hybrid, water-lubricated bearing