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Particle Size, Morphology and Color Characteristics of C.I. Pigment Red 57:1 : 1. Effect of Synthesis Conditions

  • Textile Coloration and Finishing
  • Abbr : Text. Color. and Finish.
  • 2015, 27(4), pp.229-244
  • Publisher : The Korean Society Of Dyers And Finishers
  • Research Area : Engineering > Fiber Engineering > Dyeing Engineering

서희성 1 이현경 2 Yoo Euisang 2

1이화여자대학교
2한국생산기술연구원

Accredited

ABSTRACT

The effects of synthesis conditions on characteristics of the calcium-azo complex pigment, C.I. Pigment Red 57:1, were studied. It was mainly considered that the industrially required synthesis conditions for lowering electrical conductivity of the pigment solution keeping pigment quality such as particle size and color characteristics. Three parameters were chosen as control factors during the synthesis. The first was the amount of hydrochloric acid added to transform sodium nitrite into nitrous acid. The second was the amount of calcium chloride added to insolubilize the synthesized azo dye. The final factor was pH control during the coupling reaction. The electrical conductivity and pigment aggregate particle size were dependent on the amount of hydrochloric acid and calcium chloride. Higher HCl concentration gave brighter yellowish-red color because of smaller particle aggregate size and narrower size distribution. Amount of charged ions in the synthesis process might affect the “lake” formation resulting different particle aggregate size and color shade.

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