Tetrakis-azo compound for black, dye composition including same, and usage therefor
A compound, the technology of tetrazo, which is applied in the dye composition containing it, the field of tetrazo compound or its salt for black, can solve the problems that dyes have not been found, and achieve the effect of excellent dyeability and light fastness
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Embodiment 1
[0075] (Process 1)
[0076] [chemical formula 9]
[0077]
[0078] After adding 10 parts of 5-aminoisophthalic acid to 200 parts of water, 48% sodium hydroxide solution was dripped, adjusted to pH 6.0-7.0, and dissolved. 1.6 parts of sodium nitrite was added to the obtained solution, and it was added to the solution obtained by adding 10 parts of 35% hydrochloric acid to 90 parts of water at 10 to 15° C., stirred for 1 hour, and diazotized.
[0079] In 500 parts of water, 12.3 parts of 8-amino-2-naphthalenesulfonic acid was adjusted to pH 4.5 to 5.0 by 48% sodium hydroxide solution, and then dripped for about 30 minutes at a temperature of 10 to 15°C. Add the resulting diazotized suspension. During the dropping, the pH of the reaction solution was maintained at 4.0 to 5.0 by adding an aqueous sodium carbonate solution. After completion of the dropwise addition, the mixture was stirred at 5 to 10° C. and pH 4.0 to 5.0 for 5 hours, and further stirred at 15 to 20° C. overn...
Embodiment 2
[0094] (Process 1)
[0095] [chemical formula 13]
[0096]
[0097] After adding 10 parts of 2-amino-5-hydroxy-1,7-naphthalene disulfonic acid into 200 parts of water, 48% sodium hydroxide solution was dropped thereinto, adjusted to pH 6.0 to 7.0, and dissolved. 3.0 parts of sodium nitrite was added to the obtained solution, and it was dripped into the solution which added 15 parts of 35% hydrochloric acid to 100 parts of water at 10-15 degreeC, and it stirred for 1 hour, and diazotization was performed.
[0098] In 500 parts of water, 6.9 parts of 8-amino-2-naphthalenesulfonic acid was adjusted to pH 4.0 to 5.0 by sodium carbonate solution, and the resulting solution was added dropwise at a temperature of 0 to 5°C over about 30 minutes Suspension after diazotization. During the dropping, the pH of the reaction solution was maintained at 4.5 to 5.0 by adding an aqueous sodium bicarbonate solution. After completion of the dropping, the mixture was stirred at 10 to 15° C. ...
Embodiment 3
[0110] Dissolve 1 part of dye synthesized in Examples 1 and 2 in 1000 parts of water to prepare a dye bath, add 300 parts of kraft pulp (30 parts of absolute dry pulp, 35 SR) to the dye bath, and stir at room temperature After 15 minutes, 1 part of a 30% aqueous solution of rosin gum was added, and after further stirring for 10 minutes, 3 parts of crystalline aluminum sulfate were added and stirred for 20 minutes. Paper is made from the dyed pulp, and after drying, a black dyed product is obtained.
[0111] The obtained dyed product was color-measured by COLOREYECE3000 (manufactured by Macbeth Corporation) and visually, and the dyeability was evaluated by colorimeter judgment and visual judgment based on gray scale comparison for discoloration and fading.
[0112] For the known dyes A and B, pulp was dyed in the same manner, and paper was made, and tests were carried out. In addition, the dye A is C.I. Direct Black 19, and the dye B is C.I. Direct Black 168, both of which are...
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