Preparation method of permanent violet pigment
Shenjia Hydraulic
Release time:
2022-04-21
Permanent Violet is nitrated by N-ethylcarbazole with mixed acid, reduced by sodium sulfide, condensed with trichlorobenzene and tetrachlorobenzoquinone, then closed and oxidized in p-toluenesulfonyl chloride, and then filtered, dried, pulverized and other processing steps product is obtained.
Permanent Violet is nitrated by N-ethylcarbazole with mixed acid, reduced by sodium sulfide, condensed with trichlorobenzene and tetrachlorobenzoquinone, then closed and oxidized in p-toluenesulfonyl chloride, and then filtered, dried, pulverized and other processing steps product is obtained. The product requires the appearance of dark green light purple powder, light fastness grade 7-8, heat resistance 200℃, oil absorption 38%, acid resistance (5%HCl) and alkali resistance (5%Na2CO3) are both grade 5, Water permeability and oil permeability are both grade 5, alcohol permeability grade 4, ester permeability grade 4, ketone permeability grade 3, and xylene resistance grade 3. Raw material consumption (kg/t) N-ethylcarbazole 1100 tetrachlorobenzoquinone 870 p-toluenesulfonyl chloride 590.
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