How to use organic pigment dispersants
1. Dissolution and dilution
Add the dispersant to an appropriate amount of warm water and stir until it is completely dissolved to
form a uniform solution. Adjust the amount of dispersant according to the type and concentration of the
organic pigment, usually 10% to 30% of the weight of the pigment.
2. Mixing with pigment
Preparation before mixing: Make sure that the pigment and dispersant are dry and free of impurities.
Mixing process: Slowly add the dissolved dispersant to the organic pigment, stirring while adding to avoid
flocculation caused by excessive local concentration. Continue stirring for a period of time after mixing
(such as 10 to 15 minutes) to ensure that the pigment particles are fully dispersed.
3. Adjust pH value
According to the characteristics of organic pigments, use acid or alkali to adjust the system pH to an appropriate
range (usually 5 to 8) to enhance the dispersion effect. This step helps to make the pigment particles more stably
dispersed in the solution.
4. Temperature control
Maintain a stable temperature during the dispersion process to avoid high temperature causing dispersant failure or
pigment aggregation. Appropriate temperature helps the dispersant to work better and improve dispersion efficiency.
5. Subsequent treatment and testing
Subsequent treatment: After dispersion, undispersed pigment particles and impurities can be removed by filtering,
centrifugation and other methods to obtain a purer dispersion.
Performance test: The performance of the dispersed pigment is tested, including color intensity, transparency, glossiness
and storage stability. These tests help evaluate the effect of the dispersant and the quality of the dispersion.
6. Precautions
The amount of dispersant should be moderate. Too little may not fully play its role, and too much may affect the
performance of the pigment and the quality of the coating.
During the dispersion process, the state of the dispersion should be observed regularly, and the stirring speed and time
should be adjusted in time to ensure the dispersion effect.
After dispersion, the equipment and tools should be cleaned in time to avoid residues from affecting subsequent production.
In summary
The use of organic pigment dispersants requires comprehensive consideration of multiple factors, including dissolution and
dilution of dispersants, mixing with pigments, adjustment of pH value, temperature control, and subsequent treatment and
testing. Through scientific and reasonable use methods, the role of dispersants can be fully exerted to improve the dispersion
effect of pigments and the quality of coatings.
