Common Double Azo Pigments And Applications
Pigment yellow 12 manufacturer says, double azo pigment refers to pigments containing two azo groups in the pigment molecule, generally the diazonium salt of a diarylamine coupled with a coupling component, which is the benzidine yellow pigment, which has a chromatographic distribution of strong greenish yellow, medium yellow, reddish yellow and orange, and is almost all over the full chromatographic spectrum from yellow to orange. The majority of benzidine azo pigments are used in printing inks, where they have excellent colouring power and transparency to meet a wide range of customer needs.
Benzidine azo pigments have good thermal stability in printing inks, and they can withstand temperatures of 180 to 200°C. However, the resistance of benzidine pigments to migration, sunlight and weathering is not very good, which leads to a great limitation of its application range. Apart from Pigment Yellow 83, which can meet the requirements for outdoor use, the outdoor coatings market is mainly occupied by monoazo pigments. Benzidine azo pigments are widely used in the plastics industry, common pigment varieties are pigment yellow 12, pigment yellow 13, pigment yellow 83 and so on, the following is a specific introduction to their scope of application:
Pigment Yellow 12
Pigment Yellow 12 belongs to the simplest pigment in the chemical structure of benzidine yellow bis azo pigment, at the same time, it is also a very important benzidine yellow azo pigment, its colour light is positive yellow, and it can be used as the yellow component of three-colour or four-colour overprinting when modulating offset printing ink. By adjusting the transparency of pigment yellow 12, it is possible to meet the requirements of a wider range of applications, thus enabling a wider variety of pigments to be obtained. It is also a typical yellow azo pigment of the bis-arylamine group which is resistant to varnish coatings and is therefore often used in can printing to protect the printed layer against damage caused by friction. Pigment Yellow 12 is also resistant to sterilisation and is one of the main colourants that can be used to meet the requirements of inks for packaging printing.
Pigment Yellow 13
Pigment Yellow 13 is mainly used to modulate printing ink, especially offset printing ink, it has good resistance to solvent and crystalline than No.12 yellow, excellent migration resistance, the colour light of the dyed products is consistent with the yellow standard for three-colour and four-colour overprinting stipulated by the European standard, and it is the highest transparency of a kind of pigment in the yellow pigment, and after its surface is treated with resin, the colouring strength in ink is 25% higher than that of Pigment Yellow 12, under the condition of similar transparency. 25% higher than Pigment Yellow 12.
Pigment Yellow 83
Pigment Yellow 83 has excellent fastness properties and is therefore very versatile. It has a reddish yellow colour, which is redder than Pigment Yellow 13 and has a stronger colouring power. By mixing Pigment Yellow 83 with Pigment Yellow 17, a positive yellow printing ink with good transparency and high fastness to sunlight can be obtained.
Pigment Yellow 83 has good solvent resistance, rarely recrystallises during processing, is a highly transparent pigment variety, and is also resistant to varnish coatings and disinfection treatments, so it is widely used in plastics. Because of its good solvent resistance, there is no migration problem even when colouring soft PVC at low concentrations, let alone bleeding or frosting. In plastics, Pigment Yellow 83 has a heat resistance of 200°C as well as excellent fastness to sunlight. When used in polymethacrylate or unsaturated polyester resins, Pigment Yellow 83 does not affect their curing.