Polati, E., Vatavuk, J., da Silveira, L., and de Paula, E., "Development and Application in Dampers and Gas Springs of a Hydraulic Fluid with Biodegradable Properties and Strong Thermochemical Resistance Based on Innovative Molecular Structure," SAE Technical Paper 2013-36-0498, 2013, doi:10.4271/2013-36-0498.
A damper and a gas spring being a thermo engine which vibrational energy absorption occurs over heat transformation, requires very specific properties of thermo chemical stability from the hydraulic fluid as well as shear strength by heat and pressure effect. It competes to the hydraulic fluid the task of this transformation vehicle. The absorption performance of a damper depends on variation of physical-chemical properties of the hydraulic fluid under heat effect and the maintenance of this performance depends on conservation of those properties during time. The traditional hydraulic fluids for this application, despite its thermo-chemical stability, suffer a deterioration process of those properties under severe operating conditions and consequently reflect in the damper component lifetime.This report presents the development results of new materials and additives for formulating a fluid with biodegradable properties, maintenance of properties during time as well as thermo chemical stability. The technology and molecular concept used in this project are innovative for this application bringing strong environmental and sustainability claims based on making processes.