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Pigment Red 53:3

Catalog Number DYE-PIG-0470
CAS Number 73263-40-8
Structure
Synonyms Pigment Red PR, Eupolen Red 36-9001, Lithol Red K 3690
Molecular Weight 376.81
Molecular Formula C17H13ClN2O4S
CI Number C.I.15585:3
Color red
Main Molecular Structure Single azo
Preparation Method 2-Amino-5-chloro-4-methylbenzenesulfonic acid diazotization, and Naphthalen-2-ol coupling, and then into strontium salt.
Properties Slightly soluble in water and ethanol, not soluble in acetone and benzene. In concentrated sulfuric acid for cherry red, dilution after brown light red precipitation; In 10% sodium hydroxide solution slightly soluble, for yellow; In the potassium hydroxide ethanol solution for dark brown light red. Pigment solution to join concentrated hydrochloric acid red precipitation; Join concentrated sodium hydroxide solution have brick red precipitation

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