The physical properties of the pigment between applications

Fineness and hiding power relations; thickness and opacity pigment particles have a great relationship, then hiding poor coarse particles too small part of the light will produce diffraction, reflectivity, opacity caused decreased pigment particles is not the more so detailed the better. The actual preparation of the coating when the optimum particle size of the pigment particles be in the range between 0.25 ~ 0.5/um, steep and narrow distribution curve by excellent. Industrial production of colorants such as paint pigment particle size distribution can be done in the range 0.25 ~ 1.5/um accounted for 80% or more of an optimum product, can be used for pigment printing.Metallic stearate
Fineness relationship with coloring pigment fine particles, particles of light scattering intensity, absorbing force, high color strength. If coarse, light scattering weakened absorption rate has dropped, tinting strength is low. However, if the particles are too thick, the migration may cause shade changes, resulting in dark shade wilt, not bright issue.Plasticizer for PVC
Color fastness fineness relationship; coating polymer printing relies PA (acrylic) adhesive or PU (polyurethane) coated with a binder effect, the pigment particles as a colorant fixed to the textile fibers , and if one pigment particles thick, coated anchor effect after the fall, it will cause abrasion, washing fastness etc. down, and even cause product failure. The chemical structure of the pigment itself on light fastness, light fastness was elected with a good paint after, its particle size and fineness and light fastness related. This is because the pigment fastness properties and is inversely proportional to the square of the particle diameter, so that the pigment particles are smaller, more easily fade, will result in decreased light fastness.
Fineness relationship with paint stability; pigment particles are too thick, resulting in large particle deposition; if particles too small, then the kinetic energy increases, the probability of collision increases, the results also have a mutual cohesion of the clumps, resulting in precipitation. In short, the pigment particles is too large or too small will result in instability of the paint reservoir and use. Moreover, crystal form of the pigment particles (e.g., spherical, rod, needle-shaped, polygonal, etc.) of the coating color brightness, opacity, have different levels of fastness. The study suggests that, in order to approximate sphere were as good to carefully choose is due.