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Preparation method for special pigment for aqueous printing ink

A production method, water-based ink technology, applied in the direction of organic dyes, etc., can solve the problems of inability to use water-based ink, poor dispersibility, low pigment coloring rate, etc., and achieve the effect of low cost, simple process and good stability

Active Publication Date: 2011-01-12
WUJIANG TUNCUN PIGMENT PLANT
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  • Application Information

AI Technical Summary

Problems solved by technology

However, under the preparation of this process, the coloring rate of the pigment produced by this process is not high, the dispersibility is not good, and it cannot be used in water-based ink

Method used

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Examples

Experimental program
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Embodiment Construction

[0020] A kind of preparation method of water-based ink special pigment, its concrete production steps are as follows:

[0021] (1), diazotization

[0022] a. Add 1200 liters of water to the diazo reaction kettle, add 56 kg of 30% liquid caustic soda and stir, add 90.1 kg of 98% 2B acid, heat up to 90°C, fully dissolve, and the pH value is 9.0.

[0023] b. Then add ice to cool down to 10°C, stir for 5 minutes, add 150 kg of 30% hydrochloric acid (flow rate 15 minutes), and the temperature at the end of addition is 15°C.

[0024] c, add 95 kilograms of 30% sodium nitrite again (flow velocity 10 minutes), continue to stir for 60 minutes, the whole process keeps sodium nitrite slightly excessive, and terminal detection is detected as light blue with potassium iodide-starch test paper, and is blue with Congo red test paper Blue, adjust the temperature to 5-10°C, and finally make a diazo solution with a volume of 2000 liters.

[0025] (2), preparation of coupling solution

[0026...

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PUM

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Abstract

The invention relates to a preparation method for special pigment for aqueous printing ink. The method comprises the following steps of: (1), preparing diazotization liquid by a diazotization process for later use; (2), preparing coupling fluid; and (3), coupling, namely a, adding the diazotization liquid into the coupling fluid at the flow speed of 25 minutes, and controlling the pH value to be 10 and the temperature to be below 15 DEG C; b, continuing stirring for one hour and adding rosin fluid; c, reacting for 60 minutes and then adding 60 kilograms of 95 percent anhydrous calcium chloride; and d, raising the temperature to 85 DEG C after one hour, adding 40 kilograms of strontium nitrate dissolved with water with the temperature of 70 DEG C, raising the temperature to 90 DEG C, regulating the pH value to be 6 to 6.5 by using aluminum sulphate fluid, adding 7 kilograms of dissolved rosin amine, stirring for 60 minutes, and filtrating, rinsing, drying and crushing. The method has the advantages of use of aqueous solvent, simple process and low cost. Furthermore, the environmentally-friendly aqueous printing ink has low mammalian toxicity, no pollution, good flocculability, and good stability in an aqueous medium.

Description

Technical field: [0001] The invention relates to a method for preparing C.I. Pigment Red 48:2, in particular to a method for preparing a special pigment for water-based ink. Background technique: [0002] At present, when preparing special pigments for water-based inks, the process is generally: diazotization of 2B acid under the conditions of pH < 2 and temperature < 5 ° C, and then coupled with 2, 3 acid, prepared with calcium chloride as raw material Calcium ion suspension is used as the raw material for the coupling lake and the pH is adjusted to 10, the water-based additive is added, and the pigment red 48:2 is prepared by coupling and salting out. However, under the preparation of this process, the coloring rate of the pigment produced by this process is not high, the dispersibility is not good, and it cannot be used in water-based ink. Invention content: [0003] In order to solve the above technical problems, the present invention provides a method for makin...

Claims

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Application Information

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IPC IPC(8): C09B67/20
Inventor 梅跃新
Owner WUJIANG TUNCUN PIGMENT PLANT
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