Solvent Red 32

Preparation

2-Methyl-4-(o-tolyldiazenyl)benzenamine diazotization, with 4-Hydroxynaphthalene-2,7-disulfonic acid coupling, and then translate into dicyclohexyl amine salt.

Properties and Applications

blue light red. Dark red powder. Soluble in water for magenta to red, soluble in ethanol to red. In concentrated sulfuric acid for dark blue, after dilution for brown. Dye aqueous solution to join concentrated hydrochloric acid for orange; Join strong caustic for red sauce. Used for plastic, grease, ink and paint color.

Standard	Light Fastness	Heat-resistant(℃)		water	Sodium Carbonate(5%)	Hydrochloric acid(5%)
		Melting point	Stable
ISO	Good		120(1hr)	Well	Poor	Poor