Modified pigments
A pigment and modification technology, applied in the direction of organic dyes, azo dyes, disazo dyes, etc., can solve the problem of staining or erasing of dye images
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Embodiment 1
[0063] Example 1 : Pigment Red 122 treated with diazonium salt from compound 1 and p-aminobenzoic acid (PABA)
[0064] A. Diazotization of 2-aminotriazole-5-carboxylic acid (ie, compound 1)
[0065]
[0066] 52.5 ml of 1M NaOH solution and 100 ml of water were sequentially added to 6.4 g (50 mmol) of ground compound 1 in a beaker. The mixture was stirred at room temperature until compound 1 was completely dissolved. After adding 25ml of 2M NaNO 2 After solution, the mixture thus obtained was added to 40 ml of 2M H over 30 min using a peristaltic pump. 2 SO 4 , 40g of ice and 125ml of water in a mixture. During this process, the temperature of the mixture was kept below 5°C. After this addition is complete, check for excess nitrite by using starch-KI test paper, if the result is negative, add a few drops of 2M NaNO 2 . The diazonium salt solution (containing the diazonium group (diazonium salt) in an amount of about 50 mmol) was kept on ice and used within 30-60 minu...
Embodiment 2
[0074] Example 2 : Treatment of various pigments with diazonium salt from compound 1
[0075] Following the procedure described in Example 1, four pigments, namely, Pigment Red 122 (PR122), Carbon Black (BP700 grade, manufactured by Cabot Corporation), Pigment Blue 15:4, were treated with the diazonium salt from Compound 1. (PB15:4) and Pigment Yellow 74 (PY74). PR122 has an average particle size M of 300nm v . The results are shown in Table 2 below.
[0076] Table 2
[0077]
[0078] The results showed that the diazonium salt from compound 1 effectively modified PR122, BP700 and PB15:4 by attaching organic groups to their surfaces. Furthermore, PR122 modified with the diazonium salt from compound 1 has a much smaller average particle size than the unmodified pigment.
[0079] The results also showed that the diazonium salt from compound 1 can modify the surface of PY74 by attaching organic groups to it. As shown in "Dispersant chemistry gives up its secrets" by Sha...
Embodiment 3
[0080] Example 3 : Pigment Red 122 treated with diazonium salt from compound 2
[0081] Into a 1 liter three necked round bottom flask with overhead stirrer (Teflon blades) was added 89.2 g of filter cake of Pigment Red 122 (containing 28% (i.e., 25 g) of the pigment) followed by 700 ml of deionized water and 40ml of 2M H 2 SO 4 . After adding 4.2 g (50 mmol) of 3-amino-1,2,4-triazole (compound 2), the mixture was stirred at room temperature for 45 minutes for homogenization. Then, 25 ml of 2M sodium nitrite solution was added to the mixture over a period of 5 minutes while continuing to stir the mixture. During the addition some foaming was observed. After the nitrite addition was complete, an H-acid spot check was performed and showed a strong positive result. Stirring was continued at room temperature for 3 hours, at which time the H-acid spot test was negative. The pH of the mixture was adjusted to 8 by adding 1M NaOH solution. Then, the mixture was sonicated for ...
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