Interpret the physical properties of organic pigments.
This pigment refers to a type of pigment made of an organic compound having color and other series of pigment characteristics. Pigment characteristics include light fastness, water immersion resistance, acid resistance, alkali resistance, organic solvent resistance, heat resistance, crystal form stability, dispersibility and hiding power, and their physical properties are special compared to other types.
Organic pigment physical properties:
1. Color is a characteristic property of pigment properties, especially coloring pigments. The color nature of a pigment is closely related to its chemical composition. Pigments of different chemical compositions each have their own characteristic color, but their color also has a certain range of changes. Although the chemical composition is the same, the crystal structure is not necessarily the same, the difference in particle size, particle size distribution, impurity content, and the like.
2. The pigment is added to the transparent base material to make it opaque, and the large amount of pigment required to completely cover the black and white of the substrate becomes the hiding power. The optical nature of opacity is caused by the difference in the refractive index of the pigment and the surrounding medium. When the refractive index of the pigment is equal to the refractive index of the base material, it is transparent. When the refractive index of the pigment is greater than the refractive index of the base material, the hiding power appears. The greater the difference between the two, the stronger the hiding power of the performance.
3. The tinting strength of an organic pigment is the ability of a certain pigment to blend with another reference pigment. The coloring ability of various colored or black pigments to white pigments is usually measured on the basis of white pigments. For the white pigment to compare its coloring ability, the existing method of comparing the color reduction force is used to compare the coloring power of different white pigments by adding a blue pigment to offset.