Technical Papers
Improving the Anti-Foam and Air Release properties of Lubricants with Degussa / Goldschmidt Tego 500 Series Defoamers and RohMax Viscoplex Viscosity Index Improvers
Authors: Roland Schweder
Co-Author: Aidan Rose
Rene Haensel Degussa / Goldschmidt AG Essen
E-Mail: roland.schweder@degussa.com
aidan.rose@degussa.com
presented at: STLE Annual Meeting
May 07 - 11, 2006
Telus Convention Center
Calgary, Alberta, CANADA
Tego 500 series defoamers are a new generation of highly effective anti-foam additive based upon OMS (organo modified siloxanes) technology. These products offer excellent defoaming characteristics. Examples will be given in hydraulic formulations blended in API group I and group III oil.
While traditional silicone oils often have poor air release properties, Tego D 515 can be used to formulate fluids that show low residual air levels immediately after air cut off in industry standard tests. The retention of defoaming capabilities has been proven over extended storage time.
Negative effects on paintability of metal surfaces which are characteristic of surface contamination with silicones do not apply for OMS type products.
A significant reduction in air release time has been demonstrated in ISO VG 46, 68, and 100 hydraulic fluids formulated with API group I oils, Viscoplex VII, and Tego D 515. Fluids with high VI’s in the range of 150 to 200 show over 50% reduction in air entrainment values compared to monograde oils with the same kinematic viscosity.
Fluids formulated with Tego OMS and Viscoplex VII offer superior performance in the demanding operating conditions of modern hydraulic equipment.