The role of Dispersing agent MF is to reduce the time and energy required to complete the dispersion process, stabilize the dispersed pigment dispersion, modify the surface properties of pigment particles, adjust the movement of pigment particles, etc.
It is embodied in the following aspects:
Shorten the time and energy of the Dispersing agent MF process
Through affinity, the surface of pigment particles can be more quickly transformed from "gas-solid interface" to "liquid-solid interface". Thus reducing the time and energy required for grinding.
Reduce the viscosity
The application of dispersant can reduce the viscosity and increase the loading capacity of pigment.
Prevent flocculation and return to coarse
Dispersant on pigment surface, through electrostatic repulsion or steric hindrance to avoid mutual attraction and close, so as to increase the stability of the system.
It is worth mentioning that the finer the pigment particles, the larger the specific surface area, the higher the surface energy, the need for higher adsorption strength of Dispersing agent MF, so the amount of dispersant is also related to the quality of the paste.
Prevent floating hair
Similar to the above principle, is the essence of dispersant stability.
Improve color performance
Improve the tinting power, increase the display of color. Enhance the saturation and transparency of organic pigments, and increase the hiding power of inorganic pigments.
Influence on paint film performance
Dispersant will not leave the paint film after the film forming, but as a permanent part of the paint film exists in the paint film, it has no small effect on the performance of the paint film.
Influence on water resistance:
From the action principle of dispersant, the essence of dispersant is surfactant, with amphiphilic properties. Therefore, the dispersant will inevitably have a certain hydrophilic, in the paint film has a great impact on water resistance.
Sv-246h water-based superdispersant is a hydrophobic modified product, the film dry, will not affect the film itself water resistance.
Effect on gloss:
The gloss of the paint film surface is mainly derived from the reflection of the light on the paint film surface, and the surface state depends on the particle size of each component, as well as compatibility and distribution state.
Dispersant dispersion, stability is undoubtedly a great help to the gloss of the paint film. But also need to consider the dispersant itself and resin itself compatibility. For example, SV-246H water-based superdispersant has excellent compatibility in water-based acrylic systems, and can increase gloss by 2-3% compared to conventional dispersants such as 755W and 190.
conclusion
Dispersant is a very important additive in coating.
It is not only different from the film forming auxiliaries, pH regulator will volatilize in the drying process; It is also different from wetting agent, defoaming agent and thickening agent.
Because it always exists in the paint film and has a high content, it has a great influence on the performance of the paint film. Therefore, the selection and use of dispersant is of great help to the performance of coating.
Post time: May-19-2022