Method for producing pigment red 48:2 with excellent heat resistance and migration resistance
A production method and migration-resistant technology, applied in chemical instruments and methods, organic dyes, color lakes, etc., can solve the problems of low coloring power of pigments and decline in heat resistance, achieve transparency and coloring power, and improve heat resistance , design reasonable effect
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Embodiment 1
[0024] 1) Add 200Kg of 6-chloro-4-aminotoluene-3-sulfonic acid sodium salt into the reaction kettle, add 1800Kg of water, heat up to 90-95°C, stir for 10-20min; add concentrated hydrochloric acid within 5min, and stir for more than 30min ; Then slowly add 250Kg of 30% sodium nitrite aqueous solution at 0°C to carry out the diazotization reaction and stir for 1 hour; then add 800Kg of 30% calcium chloride aqueous solution to the above diazonium solution;
[0025] 2) Add 2000Kg of water, 285Kg of liquid caustic soda and 160Kg of 2,3 acid into the coupling reaction kettle, and stir at a temperature of 40-50°C to obtain a clear liquid;
[0026] 3) Inject the diazo solution into the coupling reaction kettle at 12-15°C for coupling reaction, stir for 3 hours after adding the diazo solution; adjust the pH value of the reaction solution to 7.0, add 2Kg CH-M8, 4Kg Add O-15 into 400Kg water and heat it up to above 90°C to dissolve it, then slowly add it dropwise to the above reaction so...
Embodiment 2
[0028] 1) Add 200Kg of 6-chloro-4-aminotoluene-3-sulfonic acid sodium salt into the reaction kettle, add 1800Kg of water, heat up to 90-95°C, stir for 10-20min; add concentrated hydrochloric acid within 5min, and stir for more than 30min Then slowly add 250Kg of 30% sodium nitrite aqueous solution at 5°C to carry out the diazotization reaction and stir for 1 hour; then add 1000Kg of 30% calcium chloride aqueous solution to the above diazonium solution;
[0029] 2) Add 2000Kg of water, 285Kg of liquid caustic soda and 180Kg of 2,3 acid into the reaction kettle, stir at a temperature of 40-50°C to obtain a clear liquid;
[0030] 3) Inject the diazo solution into the coupling reaction kettle at 12-15°C for coupling reaction, stir for 3 hours after adding the diazo solution; adjust the pH value of the reaction solution to 7.0, mix 10Kg CH-3A, 10Kg Add O-9 to 400Kg water and heat it up to above 90°C to dissolve it, then slowly add it dropwise to the above reaction solution, stir fo...
Embodiment 3
[0032] 1) Add 200Kg of 6-chloro-4-aminotoluene-3-sulfonic acid sodium salt into the reaction kettle, add 1800Kg of water, heat up to 90-95°C, stir for 10-20min; add concentrated hydrochloric acid within 5min, and stir for more than 30min ; Then slowly add 250Kg of 30% sodium nitrite aqueous solution at 0°C to carry out the diazotization reaction and stir for 1 hour; then add 1200Kg of 30% calcium chloride aqueous solution to the above diazonium solution;
[0033] 2) Add 2000Kg of water, 285Kg of liquid caustic soda and 200Kg of 2,3 acid into the reaction kettle, stir at a temperature of 40-50°C to obtain a clear liquid;
[0034] 3) Inject the diazo solution into the coupling reaction kettle at 12-15°C for coupling reaction, and stir for 3 hours after adding the diazo solution; after adjusting the pH value of the reaction solution to 7.0, mix 12Kg CH-2C, 18Kg Add MOA-3 into 400Kg water and heat it up to above 90°C to dissolve it, then slowly add it dropwise to the above reactio...
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