Due to its good pigment wetting and stabilizing ability, SOLSPERSE brand polymer dispersants can reduce the influence of pigments on the rheology of coatings and inks, and are specifically used to overcome the problems caused by technological changes.
Here, we will discuss the effect of pigment dispersants on the following properties of the coating: gloss, transparency, compatibility, leveling, production, strength of color, and reduction of VOC.
luster
This is an indicator of film properties. The higher the gloss, the stronger the reflection.
For the gloss of high-quality coatings, the particles cannot be larger than 5 micron and 3 micron at most. Ink cannot exceed 1 micron. Large particles in the paint either do not disperse effectively, or flocculate, or undergo stimulating crystallization during the formulation process.
SOLSPERSE brand polymer dispersants can directly help the effective grinding, or indirectly increase the concentration of disperse pigments, because they can wet the pigment surface.
Polymer dispersants can also reduce large particles formed by flocculation and improve gloss.
Transparent
This is a characteristic of the coating film. The higher the transparency, the easier it is to see the bottom layer. The higher the hiding power, the stronger the hiding power to the bottom layer.
The amount of light reflected and passed on the surface determines the hiding power or transparency of the paint. The type of pigment and the degree of dispersion affect this. Due to the influence of refractive index and particle size, the hiding pigments have a greater influence on the reflected light.
SOLSPERSE brand polymer dispersants increase transparency by affecting the pigment particle size distribution (more uniform and narrower). For titanium dioxide, high refractive index and large particles can effectively reflect and refract light of various wavelengths. The addition of a polymeric dispersant can increase surface area (decrease agglomerates, decrease particle size), and can further increase hiding power. For transparent pigments, polymeric dispersants improve particle size distribution for more light transmission (increases transparency).
Compatible
Compatibility is important because good compatibility allows coating manufacturers to produce dispersions for many different types of resin products.
SOLSPERSE brand polymer dispersants can increase the pigment concentration and not only increase the yield, but also reduce the potential media incompatibility issues from the grinding paste to the final product. Therefore, especially in the case of using a highly compatible resin, the polymer dispersant expands the use of the base paint. This is very important for the production of mixed colored paints.
Flow/leveling
Leveling is the ability of a coating to diffuse on a specific surface. Paint surface defects are usually caused by surface tension and occur relatively quickly. Decorative paint brush marks are also often caused by inadequate leveling.
The ideal flow parallelism can be explained by Newtonian mechanics. However, after the pigment is introduced into the system, it will change. This is because particles are affected by chemical bonds and physical interactions and are very susceptible to thixotropy and pseudoplasticity.
As the pigment particles are more stable under SOLSPERSE brand polymer dispersant and the leveling property is increased, Newtonian fluid properties can be improved. It is good for leveling.
Yield
Production refers to the amount of paint and ink produced in one process. The dispersant increases the pigment concentration and can increase the paint yield.
The appropriate addition of SOLSPERSE brand polymer dispersant can reduce the viscosity and increase the pigment content of the grind paste, thereby increasing the yield.
Within a fixed time, more pigment can be dispersed, so that more products can be produced with the same weight of abrasive paste.
Obviously increasing the speed of dispersion can also increase production. Increased production results in less machine wear and reduced energy consumption, especially in reducing labor costs and fixed costs per kilogram of final product.
Color intensity
The color intensity of the paint indicates the intensity of the color hue on the applied surface. Increasing tint strength paints will look brighter and more attractive to customers.
Optimum grinding conditions can be created by balancing various factors that are opposite one another. Decreasing the average particle size of the pigment can increase the color strength.
Increasing the pigment content in the grind paste will increase the mutual collision of particles and increase the crushing rate of the pigment, but it also increases the viscosity, reduces the kinetic energy of the grind, and reduces the crushing ability of the grinded beads or beads to the pigment.
Using SOLSPERSE brand polymer dispersants can change this change. Using a dispersant can grind higher pigment concentrations, allowing the particles to break more quickly while preventing the increase in viscosity during the grinding process. In the end, the dispersant increases the colliding stability of finer particles, does not flocculate, and fully exerts its inherent color strength.
Volatile organic VOC
VOC, or volatile organics, refers to organic solvents that volatilize in the air. The lower the VOC, the less potential air pollution. This requires increasing the solids content of the coating.
The viscosity of the coating is determined by solvents, resins, and pigments. For ordinary low solid content paints, the effect of the pigment on the viscosity is not greatly affected by the resin solvent. However, the high solid content paint has less solvent and the resin has a low viscosity, so the effect of the pigment is very obvious.
SOLSPERSE brand polymer dispersants significantly reduce the effect of pigments on viscosity by reducing the mutual attraction between the particles. Therefore, for high solids coatings, the addition of dispersants will greatly reduce the viscosity, or, if the viscosity is the same, less solvent will be used.
