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Method for preparing pigment carmine 57:1

A technology of magenta and pigment, applied in the field of preparation of pigment magenta 57:1, can solve the problems of poor storage stability, limited application, easy to thicken ink and so on

Active Publication Date: 2010-10-06
HANGZHOUSR UP PIGMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a preparation method of pigment magenta 57:1, which mainly solves the problem that the red azo lake pigment existing in the prior art is used in water-based ink systems, due to poor alkali resistance and poor storage stability. If the ink is placed for a long time, it is easy to become thicker, the viscosity increases, and it turns into a paste, which limits its application and other technical problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the preparation method of a kind of pigment magenta 57:1 of this example, its steps are:

[0021] a. Preparation of diazo solution: put 3 tons of water in the diazo tank, add 170 parts by weight of 30% liquid caustic soda, 225 parts by weight of 98% 4B acid, 20 parts by weight of the first anion additive, An anionic additive is a homologue of 4B acid, heat up to 25°C and dissolve until transparent, put it into a large bucket, add ice to cool the solution to 0°C, adjust the volume of the solution to 7000 parts, quickly add 323 parts by weight of 30% Sodium nitrate solution, stirred for 5 minutes, then quickly added 400 parts by weight of hydrochloric acid with a concentration of 30%, stirred for 50 minutes, and the volume reached 8000 parts, pH≤1.5, T≤5°C;

[0022] b. Preparation of the solution: put 3.5 tons of water in the solution bucket, add 2.3 acid with a concentration of 250 parts by weight of 98%, and liquid caustic soda of 420 parts by weight wit...

Embodiment 2

[0025] Embodiment 2: the preparation method of a kind of pigment magenta 57:1 of this example, its steps are:

[0026] a. Preparation of diazo solution: put 3 tons of water in the diazo tank, add 150 parts by weight of 30% liquid caustic soda, 210 parts by weight of 98% 4B acid, 15 parts by weight of the first anion additive, Anionic additives are homologues and derivatives of 2B acid, such as C acid, 2B acid and isomers of 4B. Heat up to 25°C and dissolve until transparent, put it into a large bucket, add ice to cool the solution to 3°C, and the solution volume Adjust to 7000 parts, then quickly add 320 parts by weight of sodium nitrite solution with a concentration of 30%, stir for 5 minutes, quickly add 380 parts by weight of hydrochloric acid with a concentration of 30%, stir for 50 minutes, and make the volume reach 8500 parts, pH≤1.5 , T≤5℃;

[0027]b. Preparation of the solution: put 3.5 tons of water in the solution bucket, add 2.3 acid with a concentration of 230 p...

Embodiment 3

[0030] Embodiment 3: the preparation method of a kind of pigment magenta 57:1 of this example, its steps are:

[0031] a. Preparation of diazo solution: put 3 tons of water in the diazo tank, add 185 parts by weight of 30% liquid caustic soda, 235 parts by weight of 98% 4B acid, 20 parts by weight of the first anion additive, Anionic additives are homologues and derivatives of C acid, heated to 25°C and dissolved until transparent, put into a vat, added ice to cool the solution to 5°C, adjusted the volume of the solution to 7000 parts, and quickly added 325 parts by weight to a concentration of 30% sodium nitrite solution, stirred for 5 minutes, quickly added 420 parts by weight of hydrochloric acid with a concentration of 30%, stirred for 50 minutes, and the volume reached 9000 parts, pH≤1.5, T≤5°C;

[0032] b. Preparation of the solution: put 3.5 tons of water in the solution bucket, add 2.3 acid with a concentration of 98% of 265 parts by weight, and a concentration of 43...

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Abstract

The invention relates to a method for preparing a pigment, in particular to a method for preparing pigment carmine 57:1. The preparation method of the invention comprises: preparing diazonium liquid and coupling liquid, wherein a polyacrylic acid polymer dispersant is added during the preparation of the coupling liquid; pouring the prepared coupling liquid into the diazonium liquid to perform coupling; performing post treatment, adding [R-COO-]2Sr<2+> and [R-COO-]3Al<3+> during the post treatment; and obtaining the finished pigment carmine 57:1 by pressure filtration, drying, combination, standardization and examination. The method mainly solves the technical problem that when used in an aqueous printing ink system, a red azo mordant pigment is limited in application because the aqueous printing ink with low alkali resistance and storage stability becomes coarse again easily and becomes high viscous and pasty in long-term storage in the prior art and other technical problems.

Description

technical field [0001] The invention relates to a preparation method of a pigment, in particular to a preparation method of a pigment magenta 57:1. Background technique [0002] Usually red azo lake pigments are used in water-based ink systems. Chinese patent discloses a dry C.I. Pigment Red 57:1, dry pigment composition and their manufacturing method (authorized announcement number: CN1918243B), which is: the BET specific surface area measured by nitrogen adsorption method is 60 ~ 110m 2 / g, and the diameter measured by the mercury intrusion method is that the total volume of pores in the range of 0.1 to 3.0 μm is 1.30 to 2.00 ml / g, and it is characterized in that it contains enough 2-(3-carboxy-2-hydroxyl Naphthyl azo)-5-methylbenzenesulfonic acid water-soluble salt is all made into the aqueous solution of the inorganic calcium compound of calcium salt, add the aqueous solution or aqueous suspension liquid containing above-mentioned water-soluble salt, after carrying out ...

Claims

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Application Information

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IPC IPC(8): C09B67/20C09D11/00
Inventor 沈月明王要武
Owner HANGZHOUSR UP PIGMENT
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