A kind of black pigment and its preparation method and application
A technology of black pigments and pigments, applied in the field of black pigments and their preparation, can solve the problems of easy detachment, small space structure, and failure to meet the requirements of use
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[0033] The preparation method of organic black pigment provided by the present invention includes the steps:
[0034] The first step is to mix the acid-containing aqueous solution, aniline, catalyst and aluminum salt to obtain solution 1;
[0035] In the second step, the solution 1 is mixed with an aqueous solution containing an oxidant, and the organic black pigment provided by the invention is obtained by oxidative polymerization.
[0036] In one embodiment of the present invention, the above-mentioned first step is to add aniline to the acid-containing aqueous solution to obtain an aniline salt mixture and then mix with the catalyst and the aluminum salt.
[0037] In one embodiment of the present invention, the above-mentioned first step is to add aniline to the acid-containing aqueous solution to obtain an aniline salt mixture, then add the catalyst, and then add the aluminum salt, and mix until all is dissolved.
[0038] In the above first step, the acid can be an inorganic acid or...
Embodiment 1
[0056] Preparation of organic black pigment 1
[0057] Add 15g (0.15mol) of 36% hydrochloric acid and 3g (0.03mol) of 98% sulfuric acid to 150ml of aqueous solution, then add 14g (0.15mol) of aniline, stir at room temperature for 20 minutes, and then add 1g of ferrous chloride ( 0.005mol), 4g (0.017mol) of aluminum chloride, after all dissolved, at 30°C, add 80g (0.3mol) of 40% sodium chlorate aqueous solution at a time, stir and react at 70°C for 3 hours, and the reaction is complete. After the reaction, the reaction solution was filtered and washed with water. The resulting filter cake was dispersed with 300 ml of water, neutralized to pH 7.5 with ammonia, and then filtered and washed with water. The filter cake was dried at 120°C and pulverized to obtain the organic Black pigment 1.
[0058] The obtained organic black pigment 1 was subjected to elemental analysis and infrared analysis to confirm the change in the aluminum content and characteristic peaks. See the result figure...
Embodiment 2
[0060] Preparation of organic black pigment 2
[0061] Add 15g (0.15mol) of 36% hydrochloric acid and 3g (0.03mol) of 98% sulfuric acid to 150ml of aqueous solution, then add 14g (0.15mol) of aniline, stir at room temperature for 20 minutes, and then add 1g of ferrous chloride ( 0.005mol), 8g (0.033mol) of aluminum chloride, after all is dissolved, at 30°C, add 80g (0.3mol) of 40% sodium chlorate aqueous solution at a time, stir and react at 70°C for 3 hours, and the reaction is complete. After the reaction, the reaction solution was filtered and washed with water. The resulting filter cake was dispersed with 300 ml of water, neutralized to pH 7.5 with ammonia, and then filtered and washed with water. The filter cake was dried at 120°C and pulverized to obtain the organic Black pigment 2.
[0062] The obtained organic black pigment 2 was subjected to elemental analysis and infrared analysis to confirm changes in the aluminum content and characteristic peaks. See the result figur...
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