Thermal stability testing is a way to determine the shelf life of the emulsion polymer in certain storage conditions. These are potentially the types of conditions encountered during shipping and handling.
Thermal stability is used to accelerate splitting speed of emulsions and so show differences in emulsion stability to allow comparisons of systems and checking of emulsion concentrations. For example, an emulsion which is stable for 3 months at 45°C would be considered stable for 2 years at room temperature. Any changes seen at the higher temperature are signs that the emulsion is changing or the system altering in performance.
The polymer emulsion is heated to 65°C for 2 weeks. After it cools to 23°C, first check if there is any gelling or splitting of oil, then test its viscosity with a Brookfield Viscometer and compare with the viscosity before the sample was heated at 65°C for 2 weeks. The viscosity increase should be within <10%.
About cookies on this site