Water-color ink
A water-based ink and aryl-based technology, applied in ink, reactive dyes, copying/marking methods, etc., can solve problems such as insufficient storage stability, nozzle clogging, and poor dispersion stability
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Embodiment 1
[0232] Synthesis of pyridone compound (58)
[0233] 50 parts of 28% ammonia water was charged into the flask, and then 43 parts of ethyl cyanoacetate was added dropwise while stirring. After stirring for 1 hour, 56 parts of ethyl 3-oxobutanoate were added dropwise, and the mixture was stirred at 80° C. for 3 hours. Subsequently, 30 parts of water and 27 parts of 95% sulfuric acid were added, and then the solution was stirred at 50° C. for 30 minutes, and 600 parts of ice water were added. The precipitate was separated by filtration, washed with water, and dried to obtain 45 parts of a pyridone compound represented by structural formula (58) (80% yield).
[0234]
[0235] · Compound 11 (M 1 and M 2 are all hydrogen atoms)
[0236] A flask was charged with 6.6 parts of 2-aminoterephthalic acid, 50 parts of water and 10 parts of 36% hydrochloric acid. The mixture is then stirred and cooled to 10°C or lower. Then 9.2 parts of a 30% aqueous sodium nitrite solution were add...
Embodiment 2
[0288] · Synthesis of Tetramethylammonium Salt of Compound 11
[0289] A flask was charged with 50 parts of distilled water and 3.0 parts of the pyridone nitrogen-containing compound synthesized in Example 1 as Compound 11, and the mixture was heated to 70° C. while stirring. Then 16 parts of a 10% aqueous solution of tetramethylammonium hydroxide were added dropwise, and the mixture was stirred for 5 hours. The reaction solution was then poured into 600 parts of acetone. The obtained precipitate was separated by filtration, washed with acetone, and dried to obtain 2.5 parts of tetramethylammonium salt of compound 11 (yield 57%).
[0290] The maximum absorption wavelength of the salt in aqueous solution is 441 nm, and the gram absorption coefficient is 71,400 ml / g·cm. Solubility in water is 3% or higher.
[0291] ·Ink preparation
[0292] An ink was prepared in the same manner as in Example 1, except that the potassium salt of Compound 11 was replaced with tetramethylammon...
Embodiment 3
[0300] · Compound 1 (M 1 and M 2 are all hydrogen atoms)
[0301] 6.6 parts of 3-aminophthalic acid, 50 parts of water, and 10 parts of 36% hydrochloric acid were charged in the flask, and the mixture was stirred and cooled to 10° C. or lower. Then 9.2 parts of a 30% aqueous sodium nitrite solution were added dropwise, and the mixture was stirred for 2 hours. Subsequently, 0.2 parts of sulfamic acid were added, and the solution was stirred for 30 minutes (azo salt solution). Meanwhile, 50 parts of water, 5.5 parts of the compound represented by the chemical formula (58) synthesized in Example 1, and 5.3 parts of a 30% aqueous sodium hydroxide solution were cooled to 10° C. or lower while stirring. Then the above-mentioned azo salt solution was added, and the reaction was carried out for 3 hours. Then, 200 parts of water were added, and the mixture was stirred for 30 minutes. The precipitate was obtained by filtration, washed with water, and dried to obtain 12 parts of the...
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