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Pigment Dispersants
This time, we will discuss the effects of pigment dispersants on the properties of coatings such as gloss, transparency, compatible, leveling, production, coloring strength, reduction of
VOC
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1 gloss
which is an indicator of coating properties, the higher the gloss, the stronger the reflection.
the gloss of high-quality coatings, particles can not be greater than 5 microns, a maximum of 3 microns
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. Ink must not exceed 1 micron. Large particles in the coating either cannot be dispersed effectively, flocculate, or stimulate the crystal during preparation. Polymer dispersants can also reduce large particles formed by flocculation and improve luster.
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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 cover, the stronger the underlying cover. The amount of light reflected and passed on the surface determines the cover or transparency of the coating. The type and dispersion of pigments have an effect on this. Because of the refractive index and particle size, masking pigments have a greater effect on reflected light.
polymer dispersants increase transparency by affecting the particle size distribution of pigments (more uniform and narrow). For titanium white powder, high refractive index and large particles can effectively reflect and refract light of various wavelengths. The addition of polymer dispersants can increase the surface area (reduce the reunion body, reduce particle size) and further improve the masking power. For transparent pigments, polymer dispersants improve particle size distribution to allow more light to pass through (increase transparency).
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3
s
compatible is important because good compatible allows coating manufacturers to produce dispersion systems for a wide range of resin products. Polymer dispersants can increase pigment concentrations, not only increasing yields, but also reducing potential media incompatibness problems from grinding slurry to the final product. Therefore, especially with high compatible resins, polymer dispersants expand the use of basic coatings. This is very important for the production of mixed coloring coatings.
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flow/leveling
is the ability of the coating to diffuse on a particular surface. Surface defects in coatings are usually caused by surface stress and occur relatively quickly. Brush marks on decorative coatings are also usually caused by a lack of leveling. The ideal leveling behavior can be explained by Newtonian sociology. But when pigments are introduced into the system, they change. This is because particles are affected by chemical bonds and physical interactions and are very susceptible to tentacles and false plasticity.
pigment particles are more stable under the action of polymer dispersants and the leveling is increased, newtonian fluid properties can be improved. It's good for leveling.
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production
is the amount of paint and ink produced in a process. Dispersants increase pigment concentration and increase coating yield. The proper addition of polymer dispersants can reduce viscosity and increase the pigment content of abrasive slurry, thus increasing yield. Over a fixed period of time, more pigments can be dispersed, allowing more products to be produced with abrasive slurry of the same weight. Significantly faster dispersion can also increase yields. Increased production reduces machine wear and energy consumption, especially labor and fixed costs per kilogram of final product.
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coloring intensity
paint coloring intensity indicates the intensity of the color phase on the applied surface. Paints that increase coloring intensity will look brighter and more attractive to customers. Optimal grinding conditions can be created by balancing competing factors. Reducing the average particle size of the pigment increases the coloring intensity.
Improving the pigment content in the abrasive slurry increases the collision of particles and increases the crushing rate of the pigment, but also increases the viscosity, reduces the dynamic energy of the grinding, and reduces the ability of the abrasive ball or beads to break the pigment. This change can be changed by using polymer dispersants. Dispersants can be used to grind higher pigment concentrations, making particles break more quickly and preventing increased viscosity during grinding. In the end, the dispersant increases the collision stability of smaller particles without flocculation, thus giving full play to its internal coloring intensity.
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volatile organic voC
VOC, or volatile organic matter, refers to the system volatile into the air organic solvents. The lower the VOC, the less potential pollution to the air. This requires an increase in the solid content of the coating.
the viscosity of the coating is determined by solvents, resins and pigments. Ordinary low-solid content coatings, pigments on viscosity of the impact of no resin solvents. However, the high-solid content paint solvents are less, the resin is low viscosity, so the effect of pigments is very obvious.
polymer dispersants significantly reduce the effect of pigments on viscosity by reducing the mutual attraction between particles. Therefore, for high-solid coatings, the addition of dispersants will greatly reduce viscosity, or, under the same viscosity conditions, less solvents will be used.