Variation Of The Effects Of Adopol EVS-9279X On The Emulsion And Film Properties Of Emulsion Paint With Time
AbstractThe effects of Adopol EVS-9279X on the emulsion and film properties of emulsion paint using 5%-10% w/w sample formulations have been examined. Variation of these effects with time was investigated in this study using the same 5%-10% w/w sample formulations. The emulsion and film properties were measured at four (4) weekly intervals. Results indicate that properties, such as, surface tension, drying time and water absorption, which were initially lowered originally by Adopol EVS-9279X, especially at low formulation concentrations, showed further reductions when monitored for 8 weeks. At 7% w/w formulation, drying time was lowered from 33.5 min to 20.0 min in week 0,19.7 min in week 4 and 19.6 min in week 8. Surface tension was lowered from 1.013 x 10–1N/m to 6.56 x 10–2N/m in week 0, 6.143 x 10-2 N/m in week 4 and 6.043 x 10–2 N/m in week 8 at 5% w/w. Water absorption was lowered from 25.2% to 23.5% in week 0 and 20.7% in week 8 at 5% w/w concentration.
Solid content and specific gravity of the samples were initially lowered by Adopol EVS-9279X with subsequent gradual increase within the 8 week study period. At 6% w/w sample formulation, specific gravity was lowered from 1.53 to 1.47 in week 0, this increased to 1.56 in weeks 4 and 8. At 10% w/w formulation, solid content decreased from 53.4% to 47.5% in week 0 and then increased to 49.3% in week 4 and 49.6% in week 8. The pH, which was increased by Adopol EVS-9279X, showed negligible variation while apparent viscosity and flexibility showed no variation within the 8 week period.
Key Words: Adopol EVS-9279X, Emulsion paint, Time.
Global Journal of Pure and Applied Sciences Vol.11(1) 2005: 73-76