CS242012B1 - Blue antraquinone reactive dye stuff and method of its preparation - Google Patents

Description

One of the most valuable reactive harshes listed in the palettes of the world's dyeing companies is dyes prepared on the basis of phthalocyanine and anthraquinone derivatives. Phthalocyanine derivatives are condensed with aromatic amines having a reactive group in the molecule, most commonly with p-aminophenyl- [3-sulfatoxyl-ethylsulfone]. In contrast, anthraquinone derivatives, such as 1-amino-4-bromoanthraquinone-2-sulfonic acid, are each condensed with m-amino-phenyl- [beta] -hydroxyethylsulfone and the subsequent sulfation yields a dye.

A disadvantage of the known isomeric dye of m-aminophenyl-5-hydroxyethylsulfone is its lower solubility and low stability in an alkaline flocculation bath.

The aforementioned disadvantages are overcome by the blue anthraquinone reactive dye of the present invention

obtainable by condensing 1-amino-4-bromoanthraquinone-2-sulfonic acid with p-aminophenyl-5-hydroxyethylsulfone in an aqueous medium in the presence of carbonate alkalinity, pH 10-11 and cuprous chloride at a temperature of not more than 75 ° C, and the semi-dye obtained is converted by sulphation into a dye.

The dye according to the invention dyes and prints, by all conventional methods, the reactive dyes of textile cellulosic materials with a deep blue shade of high wet fastness and particularly high fastness to light. Compared to the known isomeric dye of m-aminophenyl- [3-hydroxyethylsulfone], this new dye also has better solubility and substantially higher stability in the alkaline flocculation bath, a significant advance.

Example 1

Stir in 250 parts of water

33.2 parts of p-aminophenyl-4-hydroxyethylsulfone, 33 parts of NaHCO 3, 1.2 parts of Na 2 CO 2 and 5 parts of CU 2 Cl 2, the mixture is heated to 65 ^° C and added.

57.3 parts of 1-amino-4-bromoanthraquinone-2-sulfonic acid and after heating to 70 ° C, the mixture is kept under stirring and under reflux at 70-75 ° C for 24 hours. Add hot water to adjust the volume of the mixture to 820 parts by volume, add 2 parts of diatomaceous earth and, after stirring at 75 to 80 ^° C for 10 minutes, filter the mixture while hot. 200 parts by volume of hydrochloric acid oc (HCl) = 9 mol / l are added to the cooled filtrate over 1 hour and, after stirring for 1 hour, the precipitated semi-colorant is filtered off and dried. 54 to 55 parts are obtained.

parts of semi-dye are mixed with good ........... Rem. brill. blau 'stup. it is then introduced into 200 parts of H2SO4 with simultaneous external cooling over a period of 5 hours and stirred for 18 hours without cooling. The slurry is poured slowly onto a mixture of 300 parts water and 400 parts ice added gradually so that the temperature at the end of the pouring does not exceed 15 degrees Celsius. After adding water to a volume of 1110 parts by volume, the dye is salted out by adding 111 parts of KCl and filtered. Dissolve well dyeed dye paste with 450 parts of water and add CaCO? reaching pH = 5-6 and then NaHCO3 to reach pH = 6.4. After filtration and washing of the precipitated gypsum, the filtrate is dried.

65 to 66 parts of a dye coloring the cellulosic textile materials with a deep blue, highly stable shade are obtained by all methods used for reactive dyes. When used in the text, parts are by weight unless otherwise specified.

Stability was compared with Remazolbrilantblau R (Hoechst) with the following results:

Dye according to PV degree of stability fastness to light 6 to 7 alkaline bath 2 to 3 washing mechanical 95 ° C 3 to 4 to 4

Claims (2)

OBJECT OF THE INVENTION 1. Blue anthraquinone reactive dye of the formula SO ^ CW-O »Sty * 2. A process for the preparation of a blue anthraquinone dye according to claim 1, characterized in that 1-amino-4-bromoanthraquinone-2-sulfonic acid is condensed with p-aminophenyl- [3-hydroxyethylsulfone] in an aqueous medium in the presence of a carbonate alkali, pH 10-11 , and cuprous chloride at a temperature of not more than 75 ° C, and the resulting colorant is converted into a colorant by sulphation.