7/28/2023 0 Comments Water emulsion meaningThey act in the following way:ĭuring mixing, they allow the wetting and dispersion of the organic phase into the aqueous phase by reducing the oil/water interfacial tension. If necessary, adjust the viscosity value with a 2% water solution of RHODOPOL 23.Įmulsifiers are basic components in water based concentrated emulsions. The final viscosity, after degassing, can vary considerably depending on the components and the working process - it should be between 10 mPa.s (Brookfield 20 rpm) for long term stability. The use of an antifoam during the process is highly recommended to avoid the increase of viscosity due to air entrapment. Emulsifiers can be added to water or to actives and component mixed by a suitable stirrer (high speed mixing agitation) to achieve an average size of approx 1 µm. Manufacture description and structures of emulsions: role of emulsifiersĭifferent parameters are involved in the preparation of an emulsion the energy input, the temperature, the way of introduction of different ingredients and the rheology are important to obtain a long term stable emulsion. Stabilizing agent or buffer can be added when necessary. Small amount of solvent can be added to obtain a solution of the active ingredient. Active ingredients need to have a good chemical stability in water. Higher flash point, safer in transport and storageĬompatibility with water-based suspension concentratesĬoncentrated base in water for suspoemulsions (SE) formulationsĮmulsions in water are suitable for liquid active ingredients and also for low melting point actives which cannot be formulated under a suspension concentrate (SC) form. Reduction of the phytotoxicity, ecotoxicity and dermal toxicity The size of the dispersed droplets generally range from 0.5 to 2 µm.Įmulsions can be obtained by a low shear or high shear process and are usually stabilized by a thickening agent and/or hydro-colloids in order to ensure long term stability.ĮW formulations, when compared to EC formulations, offer: Emulsion in water (EW) results from the dispersion of a liquid or a low melting point active ingredient in a water continuous phase.
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