What Is Azo Pigment
Pigment yellow 55 supplier said, azo pigment is a kind of organic pigment which contains azo group in the pigment structure molecule, usually made by coupling the color base diazo component with aromatic amine, naphthol/chromophenol, pyrazolone, acetoacetanilide and other coupling components.
Azo pigment in a few years ago is the largest production and use of a class of ordinary organic pigments, its production accounted for about 60% of the total production of organic pigments, azo pigment chromatography is more complete, has a bright color, high coloring power, low price and good economy, easy to manufacture and less pollution to the environment and so on, is widely used in coatings, plastics, printing ink, rubber, papermaking, stationery and cosmetic products and so on; the shortcomings are Its comprehensive color fastness performance is relatively poor.
Azo pigment can be divided into: single azo pigment, azo pigment, double azo pigment, azo condensation, etc. According to the different azo base, azo pigment can be divided into: single azo pigment, azo pigment, double azo pigment, azo condensation, etc. Nowadays, most of the yellow, orange and red organic pigments commonly used in the market are azo pigment; typical varieties are pigment yellow 3, pigment yellow 12, pigment orange 5, pigment red 21 and so on;
Monoazo pigment
Single azo pigment refers to the pigment which contains only one azo group in the molecular structure as the color generating system, including insoluble azo and color precipitation azo pigments, with yellow, orange and red as the main colors.
These pigments have lower molecular weight, simpler structure, bright color, high coloring power and medium overall color fastness. They are mainly used for coloring in the field of printing ink.
Azo precipitated pigment
Azo precipitate pigment refers to the treatment of water-soluble azo dyes with barium chloride or calcium chloride, so as to get insoluble azo precipitate as pigment. They are mainly used for coloring plastics, printing ink and stationery.
Pyrazolones
Pyrazolone pigments are mainly yellow-based, and some orange pigments. These pigments have high fastness to light and are widely used in paints, plastics and printing inks, etc. They are also important varieties for paint dyeing and printing. The representative varieties are pigment yellow 139.
β-type naphthol and color phenol AS class
Pigments with β-naphthol as coupling component, the color has orange and red, mainly red, bright color, good light fastness.
Pigments with chromophenol AS as coupling component, the colors are mainly orange, red and brown, etc. Their solvent resistance performance is greatly improved compared with β-type naphthol pigments.
Di-azo pigments
Double azo pigments are generally benzidine azo pigments, with better solvent resistance, heat stability and migration resistance, they are mainly used in printing inks, they have good heat stability in printing inks, they can withstand temperatures of 180~200℃.
Condensed azo pigment
In order to improve the light resistance, heat stability and organic solvent resistance of azo pigment, two pigment molecules can be condensed by aromatic diamine to become a macromolecule, and the pigment produced in this way is called azo condensed pigment, which is suitable for the original liquid colorant of plastics and synthetic fibers. These pigments are suitable as colorants for plastics and synthetic fibers. Representative varieties include Pigment Yellow 93, Pigment Orange 31, Pigment Red 166 and so on.