Preparation method of organic pigment with high covering power and light fastness reaching grade 7 or above and applied to coating

An organic pigment and covering power technology, applied in the field of organic pigments, can solve the problems of difficult uniform dispersion, poor bonding, poor covering power, etc., and achieve the effect of good light fastness and stable azo bond performance.

Pending Publication Date: 2022-04-15
江西隆源化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the improvement of people's living standards and the increase of environmental awareness, consumers in the current market tend to use more environmentally friendly water-based paints. In the production process of water-based paints, due to the combination of traditional azo organic pigments with water-based solvents Poor performance, which makes it difficult for most azo organic pigments to disperse uniformly in water-based solvents, resulting in poor hiding power macroscopically. The fastness performance is poor, so a method for preparing organic pigments with high hiding power and light fastness of more than 7 grades for coatings is proposed

Method used

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  • Preparation method of organic pigment with high covering power and light fastness reaching grade 7 or above and applied to coating
  • Preparation method of organic pigment with high covering power and light fastness reaching grade 7 or above and applied to coating
  • Preparation method of organic pigment with high covering power and light fastness reaching grade 7 or above and applied to coating

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment provides a technical solution: a method for preparing an organic pigment with high hiding power and light fastness reaching grade 7 or above for coatings. The preparation steps are as follows:

[0040] Step 1: Add 30 L of distilled water to a reaction vessel with a stirring and temperature control function in a capacity of 100 L, control the temperature of the distilled water to 3° C., then add 9 L of concentrated hydrochloric acid aqueous solution with a mass concentration of 38.3% and Stir, and when the temperature drops to 3°C, add 6.48kg of 2,4-dichloroaniline to the reaction vessel, and stir at a constant temperature until the 2,4-dichloroaniline is completely dissolved to obtain a reaction solution B;

[0041] Step 2: Slowly add 41.4 kg of 10% sodium nitrite aqueous solution to the reaction solution B at 3° C., and react for 30 minutes to obtain 83 L of reaction solution C;

[0042] Step 3: add 50L of 5% sodium hydroxide aqueous solution into a rea...

Embodiment 2

[0045] This embodiment provides a technical solution: a method for preparing an organic pigment with high hiding power and light fastness reaching grade 7 or above for coatings. The preparation steps are as follows:

[0046] Its main preparation steps are the same as in Example 1. Only in step 2, slowly add 60 kg of 10% sodium nitrite aqueous solution at a mass concentration of 10% to the reaction solution B in step 2, and react for 30 minutes to obtain 85 L of reaction solution C. Obtain the finished organic pigment of 11.5kg in step 4.

Embodiment 3

[0048] This embodiment provides a technical solution: a method for preparing an organic pigment with high hiding power and light fastness reaching grade 7 or above for coatings. The preparation steps are as follows:

[0049] Step 1: Add 30 L of distilled water to a reaction vessel with a stirring and temperature control function in a capacity of 100 L, control the temperature of the distilled water to 3° C., then add 9 L of concentrated hydrochloric acid aqueous solution with a mass concentration of 38.3% and Stir, and when the temperature drops to 3°C, add 11 kg of 2,4-dinitroaniline to the reaction vessel, and stir at a constant temperature until the 2,4-dinitroaniline is completely dissolved to obtain a reaction solution B;

[0050] Step 2: Slowly add 49.7 kg of 10% sodium nitrite aqueous solution to the reaction solution B at 3°C, and react for 30 minutes to obtain 91 L of reaction solution C;

[0051] Step 3: Add 50L of 5% sodium hydroxide aqueous solution into a reaction v...

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PUM

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Abstract

The invention discloses a preparation method of an organic pigment which has high covering power and light fastness of more than grade 7 and is applied to a coating, and relates to the technical field of organic pigments. The preparation method comprises the following steps: 1, adding distilled water into a reaction container with stirring and temperature control functions, controlling the temperature of the distilled water to be in a low-temperature state, adding a concentrated acid aqueous solution into the distilled water, stirring, adding a reactant A into the reaction container after the temperature is reduced to be in the low-temperature state, and reacting for 2-4 hours; stirring at a constant temperature until the reactant A is completely dissolved to obtain a reaction solution B; according to the invention, by selecting synthetic raw materials with chlorine groups, nitryl groups and sulfurous acid groups, the activity of diazonium salt is relatively high, so that later coupling is facilitated, meanwhile, after the organic pigment is formed through coupling, due to the fact that the chlorine groups, the nitryl groups and the sulfurous acid groups have relatively strong electrophilicity, the performance of a synthesized azo bond is relatively stable; and macroscopically, the color fastness to light is relatively good.

Description

technical field [0001] The invention relates to the technical field of organic pigments, in particular to a method for preparing organic pigments with high hiding power and light fastness reaching grade 7 or above for coatings. Background technique [0002] Organic pigments refer to insoluble organic substances, which are usually added to the substrate in a highly dispersed state to color the substrate. The fundamental difference between it and dyes is that dyes are soluble in the dyeing medium used, while pigments are neither soluble in the medium in which they are used nor in the substrate to be colored. [0003] With the improvement of people's living standards and the increase of environmental awareness, consumers in the current market tend to use more environmentally friendly water-based paints. In the production process of water-based paints, due to the combination of traditional azo organic pigments with water-based solvents Poor performance, which makes it difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/08C09D7/41
Inventor 黄鹏陈权弟朱小吒余江洋傅彬何江龙杨容何文武张坤武
Owner 江西隆源化工股份有限公司
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