I have a question regarding emulsion systems
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There are two types of emulsion states: water-in-oil and oil-in-water. This is related to the emulsifier, as well as the ratio between the two phases. In a water-in-oil system where there is very little oil phase and a large amount of water phase, how can one achieve a water-in-oil structure? How is this generally calculated? And how can one make the emulsion stable?
This post was last edited by pengshijun1975 on 2010-10-27 at 22:41. First, you need to know what ingredients you are using, what the main emulsifier is and what its properties are; only then can you determine the appropriate conditions and decide what type of system to use. There is plenty of information available on this topic.
The HLB value can be used as a reference, but it’s not always accurate. There are many emulsification systems available nowadays, and the choice depends on the type.
One can consult materials and manuals on emulsifiers; by calculating the HLB value, it is possible to determine the compatibility of various emulsifiers with the product, thereby identifying which emulsifier is suitable and what amount should be used.
Water-in-oil: generally, more oil should be used in the oil phase than in the water phase. However, due to factors such as raw material costs and handling properties, very little W/O oil is generally added. For the emulsifier used in the middle, one with an HLB value below 8 is generally preferred; an emulsifier with an HLB value around 5 is quite suitable. Also, if you want to use an emulsifier from a particular manufacturer, you can ask the supplier for relevant data and information; they will provide information on the approximate amount needed and the proper way of using it. Furthermore, the development of emulsifier technology has simplified the application of W/O systems. Do it more often and it will come out.
The key is to determine whether you are in the laboratory stage or in industrial production; HLB is important, but it should only be used as a reference.