SU604862A1 - Method of preparing monoazopigment-2-oxy-3-carboxy-(2'-methoxy-5-methyl-aniline)-naphthalene-1-azo-1'-(2-methoxy-5'-benzamide) - Google Patents

Description

Obtaining a pigment in a readily dispersible form makes it possible to eliminate the high energy costs of additional grinding of pigment in paints.

Example 1. 1.66 g of 3-amino-4-methoxybenzamide stirred for 0.5 h with

3.06 ml of a 31% solution of hydrochloric acid and 20 ml of water, cooled to and diazotized, by adding 1.92 ml of 30% sodium nitrite solution. At the end of the last addition, the solution is stirred for 1–20 min, and then filtered.

3.07 g of cresidide 2,3-hydroxynaphthoic acid and 0.09 g of rt-methoxybenzoic acid are dissolved at 95 ° C in 20 ml of water and 4.2 g of a 19% solution of sodium hydroxide. The solution is stirred for 15 minutes, 0.1 g of activated carbon is added, stirred es, for 10-15 minutes and filtered hot. The azo-tol solution is transferred to a flask, cooled to room temperature, 50 ml of water are poured in and cooled with help of an ice bath to 10 ° C. While stirring, the solution of the diazo compound prepared from 1.66 g of 3-amino-4-methoxybenzamide is added to the cooled solution at such a rate that no excess is detected in the reaction mass. At the end of the combination, the mass is stirred for 1 h, heated to 90 ° C and stirred at this temperature ech, e 1 h. The pigment is filtered, washed with hot water and dried at 60 ° C.

4.5 g of a purple pigment are obtained in a easily dispersed lure and good rheological properties.

Example 2. 3.07 g of cresidide of 2,3-hydroxy naphthoic acid is dissolved at 95 ° C in 70 ml of water and 4.2 g of a 19% sodium hydroxide solution. The solution is stirred for 15 minutes, 0.1 g of activated carbon is introduced, stirred esh, e 10-15 minutes and filtered hot. The azo-tol solution is transferred to a flask, cooled to room temperature, and 0.15 g (3%) of octadecylamide 2, ω-hydroxynaphthoic acid, dissolved in 3 ml of sodium hydroxide and 3 ml of alcohol is introduced. A solution of the diazo compound obtained from 1.66 g of 3-amino-4-methoxybenzamide is slowly poured into the solution obtained at 10–15 ° C to ensure that there is no excess diazo compound in the mass. At the end of the combination, esh, e, 0.15 g (3%) of 2,3-hydroxy naphthoic acid octadecylamide, dissolved in 3 ml of food and 3 ml of alcohol, is added to the pigment suspension. The pigment suspension is gently heated to 90 ° C and kept at this temperature for 1 hour. Before filtration, the mass is acidified with a weak hydrochloric acid solution to pP b-6. The pigment is filtered off, washed with hot water and dried at 60 ° C. 4.7 g of a purple pigment are obtained in easily dispersed form and good rheological properties.

Example 3. 1.66 g of 3-amino-4-methoxybenzamide are diazotized as described in Example 1.

3.07g of cresidide 2,3-hydroxy naphthoic acid is dissolved at 95 ° C in 70 ml of water and 4.2 ml

19% aqueous solution of caustic patra. The solution is stirred for 15 minutes, 0.1 g of activated carbon is added, stirred es, for 10-15 minutes and filtered hot. The azo-tol solution is transferred to a flask, cooled to room temperature, and 0.3 g (6%) octadecylamide 2.3 g of hydroxynaphthoic acid dissolved in 6 ml of sodium hydroxide and 6 ml of alcohol are added. To the resulting solution, the solution of the diazo compound is slowly added, so that there is no excess diazo compound in the mass. At the end of the combination, the pigment suspension is gently heated to 90 ° C and maintained at this temperature in

for 1 hour. Before filtration, the mass is acidified with a weak solution of hydrochloric acid to RP 7-6. The pigment is filtered off, washed with hot water and dried at 60 ° C. 4.7 g of a purple pigment are obtained in easily dispersed form and good rheological properties.

Example 4. Analogously to Example 2, a purple pigment is obtained in easily dispersible form and with good rheological

properties, using as an additive dodecylamide 2,3-hydroxy naphthoic acid. 4.7 g of a purple pigment are obtained in easily dispersed form and good rheological properties.

Example 5. Analogously to Example 3, a magenta pigment is obtained in a readily dispersible form and with good rheological properties, using 2,3-hydroxy naphthoic acid dodedylamide as an additive. Obtain 4.7 g of purple pigment in easily dispersed form and good rheological properties.

The purple pigment obtained by this invention is more stable in its coloristic properties than the commercially available azolaki, and far exceeds them in resistance to various effects. Good resistance to the action of alcohol makes it possible to use it in paints, the imprints of which are subsequently subjected to varnishing. The resulting pigment can replace ruby varnish varnish in some types of process inks and inks for monochrome printing, which will improve the quality of printing prints. The resulting magenta pigment significantly exceeds red lacquer 2 CM and imported analogue in coloristic properties. Its intensity, brightness and tone purity are incomparably higher than these red lacquer indicators 2 CM, which makes it possible to use the magenta pigment in printing inks for packs.

Claims (2)

Invention Formula The method of producing monoazo pigment 2-oxy3-carboxy - (2 - methoxy-5 - methylaniline) naphthalene-1 - azo-G- (2-methoxy-5-benzamide) by combining a prediazotized 3-amino-4-methoxybepzamide with crepid 2,3 -oxynaphthoic acid followed by isolation of the target product, due to the fact that, in order to increase the color concentration of the monoazopigment, improve its rheological properties and dispersibility, the combination is carried out in the presence of 2% b from monoazo pigment esa. Sources of information taken into account in the examination 1. Patent of Germany number 899538, cl. 22a 1, publ. 1953. 2. US patent No. 2742459, cl. 260-204, published. 1956