Sodium Hydroxide → Quinacridone

Participants

Reaction Steps

20 g of C.I. pigment red 122 having an average primary particle diameter of 90 nm (in which the content of metal ion having a valence of at least 2 was 450 ppm), 4 g of a commercially available dye C.I. acid red 249 and 110 g of deionized water were mixed, a 1% by weight sodium hydroxide aqueous solution was added so as to adjust the pH of a mixture liquid to 9.0, and the mixture liquid was dispersed with a paint shaker in the presence of zirconia beads as media for approximately 5 hours, to obtain a water-based pigment dispersion. The obtained water-based pigment dispersion had a high viscosity and caused flocculation. Further, the water-based pigment dispersion was diluted so as to have a concentration of 3% by weight, and the diluted water-based pigment dispersion was dropped on No.2 filter paper, to show bleeding of the dye.

Provenance & Evidence