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Method for preparing C.I dye read 57:1

A pigment red and mixed solution technology, applied in the direction of organic dyes, etc., can solve the problems of pigment dispersibility and weak tinting strength, and achieve the effects of low cost, simple process, high transparency and coloring

Active Publication Date: 2011-01-12
WUJIANG TUNCUN PIGMENT PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pigments prepared by this method have disadvantages such as poor dispersibility and poor tinting power.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] A preparation method of C.I. Pigment Red 57:1, its specific production steps are as follows:

[0020] (1), preparation of diazo solution

[0021] a. Add 1200 liters of water in the diazo reaction kettle, add 75 kg of 30% liquid caustic soda and stir, add 105 kg of 100% 4B acid, fully dissolve (if the dissolution is not clear, heat up appropriately), and reach a mixed solution A with a pH value of 9.0 .

[0022] b. Cool the above mixed solution A to 0° C. with ice, stir for 5 minutes, add 180 kg of 30% hydrochloric acid (flow rate 15 minutes), and increase the temperature to 10° C. to make mixed solution B.

[0023] c, add 129 kilograms of 30% sodium nitrite (flow rate 10 minutes), continue stirring for 40 minutes (the whole process keeps sodium nitrite slightly excessive) until it is slightly blue when detected with potassium iodide-starch test paper, and blue with Congo red test paper color, temperature 0-10°C, and a volume of 2500 liters of mixed solution C.

[002...

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PUM

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Abstract

The invention relates to a method for preparing C.I dye read 57:1, which specifically comprises the following steps: (1) preparing diazo liquid; (2) preparing coupling liquid; and (3) coupling: a, adding the diazo liquid into the coupling liquid, wherein the flow rate is 5 min; meanwhile, adding 140 kg of 30% caustic soda liquid, merging the flow and controlling the pH value to be 11.5; b reacting for 45 min and adding 145 kg of 95% anhydrous calcium chloride; and c, continuing stirring for 1.5 h, heating to 80 DEG C, preserving the heat for 45 min, filtering, rinsing, drying and crushing. The invention prepares the C.I dye read 57:1 through ice crushing equipment and under the conditions of low reaction temperature, simple process and low cost, and the product has higher transparency and coloring degree.

Description

Technical field: [0001] The invention relates to a preparation method of C.I. Pigment Red 57:1, which belongs to the organic pigment industry and is applied to printing inks, plastics, offset printing inks, and rubber; it can be used to prepare various types of printing inks, and can be used for light fastness in plastics. It can be used in polyethylene (especially low-density polyethylene), coloring of polystyrene, stationery (color pencils, crayons) and daily cosmetics (powder, lipstick) for purity requirements. strict requirements. Background technique: [0002] In the prior art, the following method is generally used to prepare Pigment Red 57:1, specifically: make 4B acid diazotization under the conditions of pH<2 and temperature<5°C, then couple with 2,3 acid, and use calcium chloride The calcium ion suspension prepared as the raw material is used as the raw material of the coupling lake and under the condition of adjusting the pH>10, the coupling salting out ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/20
Inventor 梅跃新
Owner WUJIANG TUNCUN PIGMENT PLANT