The average particle size is an important indicator reflecting the size of fluorescent pigment particles, and the unit is um. The finer the particle size, the easier it is for the product to disperse, melt, and downstream products.
Pigments are colored substances usually mixed with the colored substances, mainly inorganic compounds; dyes are a kind of colored substances that can be attached to various fibers and other materials directly or through the action of a mordant. It can be combined with the dyed substance, mostly organic compounds.
Pigments cannot be colored, but dyes can be colored. The difference between pigments and dyes Pigments are fine powdery colored substances, generally insoluble in water, oil and solvents, but can be evenly dispersed in them. Pigments are the secondary film-forming substances of color paints. In the wood decoration process, primers, putties and wood coloring are prepared, and pigments are often used.
Dyes are divided into the following categories according to their application performance:
1. Direct dye
2. Acid Dyes
3. Disperse dyes
4. Reactive dyes
5. Vat dyes
6. Cationic dyes
7. Ice dye
8. Polycondensation dyes
In addition, there are oxidation dyes, sulfur dyes and so on.
The temperature at which a thermoplastic resin changes from a solid state to a sticky state is called its softening point. If the softening point is too low, the product is easy to agglomerate; if the softening point is too high, the injection temperature must be increased, otherwise the pigment will be difficult to melt and cannot be dispersed.
