CAS number：14999-97-4
molecular formula：C70H28N4O10
molecular weight：1085.01
EINECS number：239-092-4

English synonyms

Vat Green 8;C.I.VATGREEN8;Vat green 8 (C.I. 71050);Khaki 2G;6,8,25,27-tetrahydrobisnaphtho[2',3':6,7]indolo[2,3-c:2',3'-c']dinaphtho[2,3-i:2',3'-i']benzo[1,2-a:5,4-a']dicarbazole-5,7,9,14,19,24,26,28,33,38-decaone;Vat Khaki 2G;Bisnaphth[2', 3' : 6, 7]indolo[2, 3-c : 2', 3'-c']dinaphtho[2, 3-i : 2', 3'-i']benzo[1, 2-a : 5, 4-a']dicarbazole-5, 7, 9, 14, 19, 24, 26, 28, 33, 38-decone, 6, 8, 25, 27-tetrahydro;Dycosthren Khaki GG

Related categories

Dyestuffs; Vat Dyes; Dyestuffs and Pigments

Introduction

C.I. Pigment Green 8 was first invented by BASF in 1921, and is still produced by many manufacturers. It is a relatively important nitroso-based green pigment. It is composed of 1-nitroso-1-naphthol and iron salt complex. combined. The pigment has excellent resistance to aromatic hydrocarbon solvents and good light fastness. In latex paint, the light fastness reaches 7 (1/3SD); the light fastness of TiO2 diluted color (1:200) is 6-7. 

Chemical properties

Use

●  For dyeing cotton fibers and polyester/cotton blended fabrics

●  Reduced khaki 2G is used for dyeing cotton and silk, with good levelness and affinity, and is the main dye for dyeing grass green. It is also used for dyeing of viscose and polyester-cotton blended fabrics.

Production method

●  Using 1,4,5,8-tetrachloroanthraquinone and 1-aminoanthraquinone as raw materials, the two are first condensed in the presence of copper powder, and then closed in the presence of aluminum trichloride, and the product is obtained after oxidation. After washing, filtering, drying and crushing, the finished product is obtained. .
Add 60kg of tetrachloroanthraquinone, 150kg of 1-aminoanthraquinone, 60kg of sodium carbonate (98%), 3.5kg of copper powder (industrial product) in the drum reactor, slowly heat up, and heat up to 220-230 in 3-4h ℃, keep warm for 2h. Stop heating, cool down, and pulverize the material for 5h.
Add 2000L of water to the reactor, add the above materials, boil at 95-100℃ for 1 hour, filter, wash and dry.
Mix 50kg of the above-mentioned condensed material, 125kg of aluminum trichloride (98%), and 25kg of fine salt powder (industrial product) for 30 minutes, then put it into a closed-loop pot, slowly heat up to 80-90 ° C, stop stirring, let it foam, and automatically Heat up to 130-140°C, stir slowly, the temperature rises to 170-180°C, hold for 30min, put it in a dilution pot with 1200L water, boil at 100°C for 30min, filter and wash with water.
Add 1000L water, 275kg sulfuric acid (98%) and two batches of closed-loop materials (beating with water about 600-800L) into the oxidation pot, then add 180L sodium dichromate solution (50%, about 90kg dry mass), heat up to 100 -102°C, keep warm for 3h. Use potassium iodide test paper to test at any time. If the oxidant is insufficient, add 20-30L sodium dichromate solution each time. After the reaction, it was filtered under pressure at 80°C, washed with water until neutral, ground and dried to obtain the finished product.