Dispersant is a chemical substance widely used in fields such as pigments, dyes, nanomaterials, etc. It can disperse solid particles or colloids into liquid media to prevent particle aggregation and precipitation. The following are the general methods for using dispersants:
Choose a suitable dispersant: Based on the particle properties and liquid medium to be dispersed, choose a dispersant with good dispersion effect. Common dispersants include surfactants, polymer dispersants, and ion exchange resins.
Pre treatment of particles: If there is agglomeration or surface adsorption of other substances on the particles, pre treatment is required. For example, when using surfactants as dispersants, methods such as ultrasonic treatment, drying, and grinding can be used to make the surface of particles smoother and more uniform.
Adding dispersant: Gradually add the dispersant to the liquid medium. You can first mix the dispersant with a small amount of medium and thoroughly stir or sonicate, then slowly add this mixture to the remaining medium.
Stirring and processing: Use a stirrer, ultrasonic processor, or other appropriate methods to process the mixture as needed. Continuous stirring or ultrasonic treatment can help to evenly disperse particles in the medium and prevent particle re aggregation.
Actively controlling conditions: Control parameters such as temperature, pH value, and stirring speed based on the recommended conditions and specific needs of dispersants. These conditions can affect the effectiveness and dispersion stability of dispersants.
Stability testing: Conduct appropriate stability tests to ensure that the dispersant can persistently maintain the dispersion state of the particles. Common testing methods include measuring the centrifugal settling velocity of suspensions, analyzing particle size, and determining stability indicators.
It should be noted that different particle and liquid systems may require different dispersants and treatment conditions. In specific applications, optimization and adjustment should be made according to the actual situation. At the same time, use dispersants in accordance with correct operating procedures and safety precautions to ensure the safety and effectiveness of the operation.