Application of Anti-flowering Dispersants: A Key Technology to Enhance the Quality of Coatings and Inks
Application of Anti-flowering Dispersants: A Key Technology to Enhance the Quality of Coatings and Inks
In coatings, inks and related industries, color uniformity, gloss and product stability are important indicators of product quality. However, in the process of production and use, the agglomeration, settlement or uneven distribution of pigment particles often leads to problems such as blooming, floating color, color spots, etc., which seriously affects the appearance and performance of products. As an important chemical additive, anti-flowering dispersant effectively solves these problems by improving the dispersion of pigment, which becomes one of the key technologies to improve the quality of products.
I. Mechanism of anti-flowering dispersant
Anti-flowering dispersant mainly works through the following mechanism:
Wetting effect: one end of the dispersant molecule has hydrophilic group (or polar group), and the other end has lipophilic group (or non-polar group). In the system, the hydrophilic group is adsorbed on the surface of pigment particles, and the lipophilic group reaches into the solvent, which reduces the interfacial tension between the pigment and the solvent, and promotes the wetting of the pigment by the solvent.
The spatial resistance effect: the dispersant forms a protective film on the surface of the pigment particles, increasing the spatial distance between the particles and preventing the particles from agglomerating due to their proximity to each other. This spatial resistance effect helps to maintain the long-term dispersion stability of pigment particles.
Electrostatic repulsion: Some dispersant molecules are charged on the surface of pigment particles, forming double layer structure, which generates electrostatic repulsion between particles and further prevents the agglomeration of particles.
Application fields of anti-flowering dispersant
Coating industry
Architectural coatings: In internal and external wall coatings, anti-flowering dispersant ensures the uniform dispersion of pigments, avoids color difference, mottling and other problems on the wall surface, and improves the decorative effect.
Automotive coatings: automotive paints require high gloss and color uniformity. The application of anti-flowering dispersant makes the color of the car body consistent under different lighting conditions and enhances the texture of the whole car.
Industrial Coatings: In anti-corrosion coatings for ships, bridges, pipelines and other large-scale facilities, anti-flake dispersants not only ensure color uniformity, but also enhance the protective properties of the coating.
Ink Industry
Printing Ink: In offset, gravure, flexo and other printing processes, anti-flake dispersant ensures even dispersion of pigments in the ink, avoiding problems such as blooming and light color in the prints, and improving the printing quality.
Inkjet Ink: In inkjet printing, dispersants help to stabilize the dispersion of pigments in ink, prevent nozzle clogging, and ensure the continuity and clarity of printing.
Other fields
Plastic coloring: In plastic processing, anti-flowering dispersants are used in the preparation of pigment masterbatch to ensure the uniform dispersion of pigments in the plastic matrix, and enhance the color effect and physical properties of the products.
Cosmetics: In makeup products, such as eye shadow, blush, etc., the dispersant helps to disperse the pigment particles uniformly, so that the products have fine texture and bright color.
Selection and use suggestion of anti-flowering dispersant
Selection according to the system
Water-based system: choose dispersant with good hydrophilicity, such as dispersant containing carboxylate, sulfonate and other groups.
Solvent-based system: choose the dispersant with good solvent compatibility, such as containing long-chain alkyl, aromatic and other non-polar groups of dispersants.
Solvent-free system (e.g. powder coating): choose the dispersant that can maintain stability under high temperature.
Considering pigment properties
Inorganic pigments: such as titanium dioxide, iron oxide red, etc., usually need dispersants with strong adsorption ability.
Organic pigments: e.g. phthalocyanine blue, quinacridone red, etc. may require dispersants with specific functional groups to enhance interaction with the pigment surface.
Optimize the adding amount
Determine the optimal adding amount through small trial experiments. If too little is added, the dispersing effect is not good; if too much is added, the viscosity of the system may increase and the gloss may decrease.
Pay attention to the order of addition and process
Usually add dispersant at the stage of pigment dispersion to ensure its full contact with pigment.
Use high-speed disperser, sand mill and other equipment to improve the dispersion efficiency.
The development trend of anti-flowering dispersant
Environmentally friendly dispersant
With the increasingly strict environmental protection regulations, low VOC, non-toxic or low-toxic environmentally friendly dispersant has become a hotspot for research and development. This type of dispersant not only meets the environmental requirements, but also enhances the market competitiveness of the product.
Multifunctional Dispersants
Future dispersants will not only have the function of dispersion, but also may have the functions of wetting, leveling, anti-sinking, thickening and other functions to simplify the formulation and improve production efficiency.
Nanoscale Dispersion Technology
With the development of nanotechnology, the application of nanoscale pigments is more and more extensive. Dispersion technology for nanometer pigment, such as hyperdispersant, polymer dispersant, etc., will become the focus of research.
Fifth, Conclusion
Anti-flowering dispersants, as important additives in coatings, inks and related industries, effectively solve the problems of flower and floating color by improving the dispersion of pigments, and enhance the quality and market competitiveness of products. When selecting and using anti-flowering dispersants, system characteristics, pigment properties and process requirements should be fully considered to achieve the best dispersion effect. At the same time, focusing on the development trend of environmentally friendly, multifunctional and nanoscale dispersing technology will help enterprises maintain their leading position in the fierce market competition.