K-type active light-resistant red azo dye and preparation method thereof

[0010] Embodiment 1, the synthesis of reactive light fast red KA

[0011] 1. Preparation of cyanuric chloride and H acid condensation reaction solution

[0012] In a 250mL four-necked flask equipped with a stirrer, dropping funnel and thermometer, respectively add 15g of crushed ice, 10mL of water and 0.011mol of cyanuric chloride for beating at 0°C for 30 minutes, then dropwise add pH=7 within 1 hour ~8 H acid solution with a H acid content of 0.01mol. After the addition, keep the pH value of the reaction solution at 2~3, continue to stir and react at 5~8°C for 3 hours, and use an amino indicator to detect the presence of H acid in the solution. Afterwards, stop the reaction and filter to obtain a clarified condensate for later use. The reaction formula is as follows:

[0013]

[0014] 2. Preparation of p-aminobenzenesulfonic acid diazonium salt solution

[0015] Add 10mL of water and 0.01mol of p-aminobenzenesulfonic acid into a 100mL beaker, start stirring, neutralize...

[0023] Embodiment 2, the synthesis of active photostable red KB

[0024] The molecular structure formula of reactive photostable red KB is as follows:

[0025]

[0026] The preparation process of active light fast red KB is the same as embodiment 1, just the p-aminobenzenesulfonic acid in embodiment 1 is replaced with m-aminobenzenesulfonic acid; 4-(4-aminobenzoate group)-2,2, Reactive photostable red KB can be obtained by replacing 6,6-tetramethylpiperidine with 4-(4-aminobenzamido)-1,2,2,6,6-pentamethylpiperidine.

[0027] Embodiment 3, the synthesis of reactive light fast red KC

[0028] 1. Preparation of cyanuric chloride and H acid condensation reaction solution

[0029] The preparation process of cyanuric chloride and H acid condensation reaction liquid is with embodiment 1.

[0030] 2, Preparation of 4-(4-aminobenzoate group)-2,2,6,6-tetramethylpiperidine diazonium salt solution

[0031] Add 30mL of water, 0.01mol of 4-(4-aminobenzoate)-2,2,6,6-tetramethylpiperidine, 3.5mL of 30% hydrochloric acid into a 150mL beaker, and start stirring to make the amino compound completely Dissolve and cool to 0°C in an ice-water bath. Dissolve 0.0105 mol of sodium nitrite in 2 mL of water, cool to 0°C in an ice-water bath, quickly add to the amino compound, keep the pH of the reaction solution below 3 after the addition, and continue to stir the reaction at a temperature lower than 5°C, after 2 hours The diazotization reaction is complete, and now the reaction solution is blue to the Congo red t...