Introduction:
Emulsification is the function of a liquid uniformly dispersed in another immiscible liquid with very small droplets. Emulsion is a liquid-liquid interface phenomenon. Two immiscible liquids, such as oil and water, are divided into two layers in the container. The oil with low density is in the upper layer and the water with high density is in the lower layer. If a proper surfactant is added and the oil is dispersed in water under strong stirring to form an emulsion, this process is called emulsification. Under the action of ultrasonic energy, two or more than two kinds of insoluble liquids are mixed together, one of which is dispersed evenly in another liquid to form emulsion liquid. This process is called ultrasonic emulsification.
Principle:
The physical mechanism of crushing insoluble solids (or liquids) is considered to be an effect of ultrasonic cavitation. Ultrasonic cavitation effect refers to that under the action of strong ultrasonic, a large number of bubbles will be generated in the liquid. Small bubbles will gradually grow and increase with ultrasonic vibration, and then suddenly burst and split, and the split bubbles will grow and burst continuously. When these small bubbles collapse rapidly, high temperature and high pressure are generated in the bubbles, and because the liquid around the bubbles rushes into the bubbles at high speed, strong micro jets are generated in the liquid near the bubbles, and local high temperature and high pressure are also formed, resulting in crushing and emulsification.
The cavitation process is affected by ultrasonic frequency and intensity. The occurrence of cavitation largely depends on the presence of liquid suspended undissolved gas, which seems to play a role of catalyst. Under certain pressure, the formation of cavity depends on the development time and ultrasonic frequency to a certain extent. The ultrasonic emulsification process represents the competition between opposing processes. Therefore, it is necessary to select the appropriate working conditions and frequency so that the emulsification effect is dominant.
Ultrasonic emulsification degassing instrument
Advantages:
1. High quality emulsion can be produced.
Can obtain small volume (only 0.2 ~ 2) μ m) And narrow droplet size distribution (0.1 ~ 10 μ M) emulsion droplet, it can also increase the concentration of up to 30%, even in the presence of emulsifier can reach up to 70% concentration.
2. Stable emulsifying effect
A stable emulsion can be obtained by using a small amount of emulsifier or without emulsifying agent. The emulsion after ultrasonic treatment can maintain stability for several months or more than half a year.
3. Ultrasonic emulsification can control the type of emulsion
Under certain conditions, ultrasonic method can generate water in oil and oil in water. In terms of mechanical method, the nature of emulsifier determines the type of emulsion. Under different sound intensity, different types of emulsion will be produced.
4. Create unique emulsion.
Phacoemulsification can also produce emulsions that cannot be prepared by general methods. For example, the commonly used mixing method can only produce 5% paraffin emulsion in water, and it is unbelievable that under the power ultrasonic field, 20% of the paraffin emulsion can be produced.
Application:
Ultrasonic emulsification technology has been widely used in food processing, papermaking, coating, chemical, pharmaceutical, textile, petroleum, metallurgy and other industrial fields. Ultrasonic equipment can be easily installed on the existing production line, which is convenient for manufacturers to upgrade the equipment at a lower cost. Ultrasonic emulsification can also create emulsions that do not work by ordinary methods. The commonly used mixing method can only produce 5% paraffin in water. It is unbelievable that under the action of power ultrasound, 20% of paraffin emulsion can be made.