Color paste has excellent quality stability and excellent dispersion. In addition to a few leaded inorganic pigments, other pigments are strictly selected low toxicity (heavy metal content below the standard range), is required to meet the requirements of low toxicity paste pigment. It has high resistance to heat, light, migration, separation, acid and alkali, and has strong coloring strength, high solid composition, etc.
1. The pigment content of the color paste
Pigment content is only for reference and can not be used as an indicator of the performance of the paste. The color strength and pigment content of the pigment are not simply proportional. The same pigment content, the fineness of different color strength is also very different. In order to ensure the stability of the coloring strength of the paste, the colorant pigment content varies within a certain range. The content provided by the documents a typical reference value.
2. Fineness of the color paste
Fineness is an intuitive indicator of the shading effect and the storage stability of the color paste. Generally for the same pigment paste, the smaller the particle size, surface area increases, and thus the covering power will increase. The higher the color strength, fineness smaller, the higher the gloss, dispersion and storage stability. Of course, the fineness of the paste is not as fine as possible, because when the particles become smaller, the specific surface area increases, the absorption of light energy increases, the degree of damage also increases, resulting in reduced weather resistance; and in the coating film drying, with the precipitation of water, the paste will migrate to the surface, leading to color not matching and color difference of the wall.
3. Dispersity of the color paste (flocculation degree)
The ability of deflocculation to the pigment particles determines the size and stability of the paste dispersion. In general, it is impossible to achieve complete de-flocculation (ie, the pigment is homogeneous and stable in the system), it is just evenly distributed in the form of agglomerates of pigment particles. A good color paste has good ability of deflocculation, that is, the agglomerates are as small as possible, so that it has a good color strength, excellent color rendering and storage stability. Because of the poor dispersion of the color paste, the migration difference between the pigment floc and the white pigment in the base material and the dispersion of the filler particles are easier to reflect. This difference tends to make the pigment flocs no longer evenly distributed. If there are tiny differences in temperature, density and surface tension inside the paint film, the pigment floc and the paint base will naturally participate in this movement, so that the pigment flocs are separated, resulting in floating and flooding. If the color paste dispersion performance is good, the occurrence of floating and flooding can be avoided. The dispersion of the paint itself is also a direct impact on floating and flooding.