1, the composition is different
Organic pigment: azo pigment accounts for 59%, phthalocyanine pigment accounts for 24%, triaromatic methane pigment accounts for 8 %, special pigment accounts for 6%, and polycyclic pigment accounts for 3%.
Inorganic pigments: inorganic pigments include various metal oxides, chromates, carbonates, sulfates and sulfides, such as aluminum powder, copper powder, carbon black, zinc white and titanium white, etc. All of them belong to the category of inorganic pigments.
2. Different characteristics
Organic pigments: organic pigments have bright colors and strong coloring power; they are non-toxic, but some varieties of them tend to be less light-resistant, heat-resistant, solvent-resistant and migration-resistant than inorganic pigments.
Inorganic pigments: inorganic pigments have good resistance to sunlight, heat, weather, solvent and strong covering power, but the chromatography is not very complete, the coloring power is low, the color vividness is poor, and some metal salts and oxides are toxic.
Expanded information:
Azocolor:
Azodyne pigment:
Azodyne pigment is a kind of organic compound which contains azodyne group in its molecular structure. In organic pigments, it is the category with the most varieties and the largest production. Azo pigment is made of aromatic amine or heteroaromatic amine by diazotization, and then the diazo component is coupled with acetyl aromatic amine, 2-naphthol, pyrazolone, 2-hydroxy-3-naphthoic acid or 2-hydroxy-3-naphthoyl aromatic amine and other coupling components to produce water insoluble precipitate, that is, general azo pigment.
The synthesis method is basically the same as that of azo dyes, but the latter is water-soluble. Commonly used general azo pigments are orange, yellow, red pigments such as: permanent orange RN, golden red, benzidine yellow G.
In order to improve the performance of pigments such as sunlight, heat, organic solvent, etc., two molecules can be condensed into a macromolecule by aromatic diamine. The pigments made in this way are called macromolecule pigments or condensed azo pigments, such as: macromolecule orange 4R, macromolecule red R.
Phthalocyanine pigments:
They are water-insoluble organic substances, mainly blue and green pigments. The British Bunemun Chemical Industry Company and the German Faben Company respectively produced the first variety--phthalocyanine blue. The vast majority of products contain bivalent metals, such as copper, nickel, iron, manganese, etc., and there are also the molecular benzene ring replaced by pyrrole ring or other rings in the molecule is also the introduction of other groups, different structures have different properties and uses.
The main variety of phthalocyanine pigment is phthalocyanine blue containing copper. The main production method in the industry is to phthalic anhydride and urea (there are also directly using phthalonitrile) in the presence of ammonium molybdate catalyst, and the reaction of cuprous chloride, the crude product is commonly known as "copper phthalocyanine".
Mechanism:
The basic optical properties and pigment properties of inorganic pigments are mainly determined by the following three aspects:
1, the difference of refractive index between pigment and dispersing medium.
2, the light absorbed by the solid (including impurities in the solid).
3, particle size and particle size distribution. Which particle size and particle size distribution can be improved by surface treatment.
Baidu Encyclopedia-Organic Pigments
Baidu Encyclopedia-Inorganic Pigments