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Organic Pigments for Solvent-Based Inks


  In addition to conventional indicators such as color and tinting strength, due to the resins used in solvent-based inks, there are many types of solvents, and the physical and chemical properties are quite different. The impact of pigments on ink application properties such as viscosity and storage viscosity stability is more obvious.
  (1) Yellow pigment
  At present, the yellow pigments that are commonly used and have good application performance are mainly PY14, PY13, PY83 benzidine yellow series. Among them, PY14 benzidine yellow can be manufactured into a series of varieties with various application properties after special surface treatment due to its own chemical structure; In addition, the price of PY12 is low, and it can also be used in solvent-based inks with appropriate improvements.
  (2) blue pigment
  The blue pigments widely use PB15:3 and PB15:4 phthalocyanine blue series varieties. Among them, PB15:4 phthalocyanine blue is a special variety with anti-flocculation and anti-crystallization properties, and has good dispersion stability and viscosity stability in solvent-based inks.
  (3) red pigment
  The red pigment varieties mainly include azo lake red series PR48:1, PR48:2, PR48:3, PR53:1, PR57:1, etc., and insoluble azo pigments PR2, PR3, PR8, PR243, etc.
  Some other high-performance organic pigment varieties are also suitable for various solvent-based inks, but the price is generally more expensive, so the amount is less. Water-based inks have more stringent requirements on pigments, mainly because the chemical structure and system composition of acrylic water-based resins are different from other solvent-based inks, especially for azo lake red pigments. In fact, due to the difference in the manufacturing process of various types of inks, even pigments with the same chemical structure will show different application properties, so it is necessary to carefully select the solvent-resin system of the ink.