Preparation of red pigment for liquid printing ink

A pigment and ink technology, applied in the field of organic pigments, can solve the problems of inability to produce hue ink varieties, poor solvent resistance, poor rheology, etc., and achieve good dispersion stability and storage stability, excellent solvent resistance and storage stability Sex, the effect of reducing environmental pollution

Inactive Publication Date: 2008-11-12
TIANJIN TOYO INK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of packaging printing technology, it is difficult to apply to liquid ink
Such as poor solvent resistance, poor dispersion stability, etc.
Poor ink rheology and poor storage stability
This makes it impossible to produce solvent-based inks in the application of C.I pigment red 48:1 hue ink varieties
Specifically, when C.I Pigment Red 48:1 is used in polyurethane system and acrylic system, the ink has high viscosity and poor rheology, and its chromatic light wave shifts, resulting in the disadvantages of not bright colors and low coloring concentration
On the one hand, the transfer performance of the ink on the printing press is poor, and on the other hand, the printed matter loses the ideal effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1 (every portion is calculated by 1kg)

[0012] A kind of preparation method that is used for liquid ink red pigment is characterized in that implementing steps are as follows: with 1kg2-amino-4-chloro.5-methylbenzenesulfonic acid in 470kg ice water and 1.5kg 30-32% hydrochloric acid medium and 0.32kg of sodium nitrite reacts to form a diazo component; then it is coupled with 1.1kg of 2-hydroxy-3-naphthoic acid at a pH value of 8-10 in an aqueous medium, and the filtered diazo solution is controlled under stirring at 120 - Slowly add to 2-hydroxy-3-naphthoic acid solution within 150 minutes, keep the temperature at 15-20°C, maintain the pH value at 8-10, stir for 120-150 minutes; add 0.3 kg metal salt laking and 0.01kg surfactant, heat up to 50-60°C; stir for 30-60 minutes, free -SO 3 H and -COOH react with metal salts to form lake red pigments; after the completion, filter the pigments, wash them with water, and carry out pigmentation treatment on the filte...

Embodiment 2

[0015] Embodiment 2 (every portion is calculated by 1kg)

[0016] A kind of preparation method that is used for liquid ink red pigment is characterized in that implementing steps are as follows: with 1kg2-amino-4-chloro.5-methylbenzenesulfonic acid in 470kg ice water and 1.5kg 30-32% hydrochloric acid medium and 0.32kg of sodium nitrite reacts to form a diazo component; then it is coupled with 1.1kg of 2-hydroxyl-3-naphthoic acid at a pH value of 8-10 in an aqueous medium, and the filtered diazo solution is stirred to control 120- Slowly add to the 2-hydroxy-3-naphthoic acid solution within 150 minutes, keep the temperature at 15-20°C, maintain the pH value at 8-10, stir for 120-150 minutes; add 0.5kg during post-treatment of red pigment Metal salt laking and 0.01kg surfactant, heating up to 50-60°C; stirring for 30-60 minutes, free -SO 3 H and -COOH react with metal salts to form lake red pigment; after the completion, filter the pigment, wash it with water, and carry out pi...

Embodiment 3

[0017] Embodiment 3 (every portion is calculated by 1kg)

[0018] A kind of preparation method that is used for liquid ink red pigment is characterized in that implementing steps are as follows: with 1kg2-amino-4-chloro.5-methylbenzenesulfonic acid in 470kg ice water and 1.5kg 30-32% hydrochloric acid medium and 0.32kg of sodium nitrite reacts to form a diazo component; then it is coupled with 1.1kg of 2-hydroxy-3-naphthoic acid at a pH value of 8-10 in an aqueous medium, and the filtered diazo solution is controlled under stirring at 120 - Slowly add to 2-hydroxy-3-naphthoic acid solution within 150 minutes, keep the temperature at 15-20°C, maintain the pH value at 8-10, stir for 120-150 minutes; add 0.3 kg metal salt laking and 0.05kg surfactant, warming up to 50-60°C; stirring for 30-60 minutes, the free -SO 3 H and -COOH react with metal salts to form lake red pigment; after the completion, filter the pigment, wash it with water, and carry out pigmentation treatment on th...

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PUM

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Abstract

The invention relates to a method for preparing a yellow pigment for liquid ink. The method comprises the following steps of : reacting 1 portion of 2-amino-5-toluene sulphonic acid with 0.32 portion of sodium nitrite to form a diazo component in 470 portions of ice water and 1.5 portions of thirty to thirty-two percent hydrochloric acid medium; coupling the diazo component with 1.1 portions of 2- hydroxide-3-naphthoic acid in water medium when the PH value is between eight and ten, filtering the diazo liquid, adding the filtered diazo liquid 2-hydrodxy-3- naphthoic acid slowly with stirring within one hundred and twenty and one hundred and fifty minutes and keeping the temperature between fifteen and twenty DEG C and the PH valve between eight and ten and stirring for hundred and twenty and one hundred and fifty minutes; during post treatment of red pigment, adding 0.3-0.5 portion of metal salt for lake and 0.01-0.05 portion of surface active agent, heating to fifty to eighty DEG C; stirring for thirty to sixty minutes, allowing absolute-SO3H and-COOH to react with metal salt to generate red lake pigment; filtering the pigment, cleaning the pigment with water and conducting routine pigmentation treatment to a filter mass after completion. The preparation method has excellent solvent resistance and storage stability life in polyurethane system ink. The method is simple in technology and remarkable in effect, effectively improving the product quality.

Description

technical field [0001] The invention belongs to the field of organic pigments, and relates to a preparation method of ink pigments, in particular to a preparation method of liquid ink red pigments. Background technique [0002] At present, C.I Pigment Red 48:1 has the characteristics of bright color, large transparency, high tinting strength, light fastness, and stable physical and chemical indicators. Therefore, it is widely used in plastic coloring, coating and printing ink. However, with the development of packaging printing technology, it is difficult to apply to liquid ink. Such as poor solvent resistance, poor dispersion stability, etc. Causes the defects of poor ink rheology and poor storage stability. This makes it impossible to produce solvent-based inks in the application of C.I pigment red 48:1 hue ink varieties. Specifically, when C.I Pigment Red 48:1 is used in polyurethane system and acrylic system, the ink has high viscosity and poor rheology, and its colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/36C09D11/02
Inventor 季维王莉陈颖赵虹
Owner TIANJIN TOYO INK
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