Emulsification of viscous alkyd resin by catastrophic phase inversion with nonionic surfactant
Pierlot, C; Ontiveros, JF; Royer, M; Catte, M; Salager, JL
| HERO ID | 4936913 |
|---|---|
| In Press | No |
| Year | 2018 |
| Title | Emulsification of viscous alkyd resin by catastrophic phase inversion with nonionic surfactant |
| Authors | Pierlot, C; Ontiveros, JF; Royer, M; Catte, M; Salager, JL |
| Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
| Volume | 536 |
| Page Numbers | 113-124 |
| Abstract | The addition of water to hydrophobic alkyd resin containing a hydrophilic nonionic surfactant (polyethoxylated-20-oleyl alcohol) was used to produce the emulsion morphology change from W/O to O/W in a small thermostated reactor (50 mL). The so-called catastrophic phase inversion of the water/alkyd resin system was detected by monitoring both, the viscosity by torque measurement and the electrical conductivity, until an equal weight fraction of water and resin is attained (f(w) = 0.5). The two methods provide similar values of the phase inversion point (PIP). Although the determination of the PIP exhibits a small inaccuracy, it is clear that different torque profiles and PIP are observed depending on the resin neutralization level, the surfactant concentration and the water addition rate. For the non-neutralized resin, both, PIP and emulsion drop size, decrease with surfactant concentration increase. The completely neutralized resin could be emulsified using a minimum of 2 wt % of surfactant in the final emulsion. In such a case the water fraction at which inversion occurs (f(w,Inv) = 0.36) is independent of the surfactant concentration and a small resin drop diameter (< 200 nm) can be obtained. A more precise study of the reached drop size of the emulsion versus resin neutralization (0, 25, 50, 75, 100 and 125%) indicates that a minimum diameter is obtained around 90-100% neutralization, with no effect of over neutralization. For non-neutralized resin a maximum f(w,Inv) (0.25) can be obtained by reducing water addition rate allowing the production of 0.5 mu m droplets in a longer process. |
| Doi | 10.1016/j.colsurfa.2017.07.030 |
| Wosid | WOS:000417065700016 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Emulsion; Alkyd; Viscous; Catastrophic phase inversion; Torque |