Preparation method of C.I. pigment yellow 74

A pigment yellow and pigment technology, applied in the field of preparation of C.I. Pigment Yellow 74, can solve the problems of uneven pigment particles, environmental water pollution, poor uniformity of coupling products, etc. The effect of high light fastness

Inactive Publication Date: 2018-09-21
HANGZHOU HONGYAN PIGMENT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional reaction is to couple the red base B diazonium salt solution with o-methoxybisacetanilide, and then heat it up after direct post-treatment. Due to the low purity of the domestic raw materials, it is difficult to completely react, and the generated pigment particles are not uniform. It is very easy to cause environmental water pollution, and because no suitable surface active agent is selected in the pigmentation reaction, the uniformity of the coupling product is poor. Therefore, the existing C.I Pigment Yellow 74 not only has low pigment hiding power and coloring strength, but also The production process has caused serious pollution to the environment

Method used

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  • Preparation method of C.I. pigment yellow 74
  • Preparation method of C.I. pigment yellow 74
  • Preparation method of C.I. pigment yellow 74

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: the preparation method of C.I. Pigment Yellow 74 specifically comprises the following steps:

[0031] 1. Preparation of diazonium salt solution:

[0032] Add 48 kg of red base B, 100 kg of hydrochloric acid solution (concentration 30%), and 500 kg of water into the diazonium reactor, stir and dissolve for 30-60 minutes, cool down to below minus 5°C, pH = 0.5-2, slowly Add 66 kg of sodium nitrite solution (concentration 30%) and stir, react for 30-90 minutes, control potassium iodide to be blue, and prepare diazonium salt solution for later use.

[0033] 2. Preparation of coupling solution:

[0034] (1) Add 65 kilograms of o-methoxybisacetanilide, 98 kilograms of sodium hydroxide solution (concentration 30%), and 1500 kilograms of water into the reactor, stir to dissolve and adjust the temperature to 25 ° C to obtain o-methoxy Diacetanilide solution for later use.

[0035] (2) Add 20 kilograms of acetic acid solution (mass fraction 98%) in the coupling r...

Embodiment 2

[0044] Embodiment 2: the method specifically includes the following steps;

[0045] A, the preparation of diazonium salt solution comprises the following steps by weight;

[0046] Add 60 parts of red base B, 100 parts of hydrochloric acid solution with a concentration of 20-40% and 400-600 parts of water into the diazonium reactor, stir and dissolve for 40 minutes, cool down to minus 3°C, and slowly add 60 parts The concentration of part is in 30% sodium nitrite solution, and stir, react for 40 minutes, control potassium iodide to be bluer, make diazonium salt solution for subsequent use;

[0047] B, the preparation of coupling solution, comprises the following steps by weight part:

[0048] (1) Add 60 parts of o-methoxybisacetanilide, 95 parts of 25% sodium hydroxide solution, and 1200-1800 parts of water into the reactor, stir to dissolve and adjust to a temperature of 20-30° C. Obtain o-methoxybisacetanilide solution for subsequent use;

[0049] (2) Add 15 parts of 98% a...

Embodiment 3

[0056] The applicant also made comparative tests on commercially available common products, Example 1, and Example 2. In the following tests, the applicant defined the commercially available common products, Example 1, and Example 2 as test group A, test group B and test group B respectively. In test group C, the applicant used an atomic force microscope to observe the three products. The images of the three different atomic force microscopes are as follows:

[0057] Figure 1-Figure 3 They are the images obtained by observing the pigment products of test group A, test group B and test group C by atomic force microscope respectively. Compared with test group A, test group B and test group C added pigment derivatives to the original components, which further improved the surface roughness of the pigments, because the raw material components of test group B were specifically adjusted for the ratio and process parameters. Preferably, the surface roughness of the pigment is great...

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Abstract

The invention discloses a preparation method of C.I. pigment yellow 74. The preparation method comprises the following steps of 1, preparation of a diazonium salt solution; 2, preparation of a coupling solution; 3, a coupling reaction; 4, preparation of an auxiliary agent suspension; 5, post-treatment of the pigment. The method has the advantages that the hue and particle uniformity problems of the post-treatment of the pigment are effectively solved, due to the addition of pigment derivatives, the prepared product is higher in color fastness to light and better in fluidity, the hiding power and the coloring intensity are simultaneously improved, the environmental pollution is extremely small in the aspect of sewage discharge, the prepared pigment can be widely used for aqueous systems ofdry paint and external wall coating, and a vacancy that the hiding power is high but the coloring power is low is filled.

Description

technical field [0001] The invention relates to a preparation method of C.I. Pigment Yellow 74, which belongs to the field of pigment processing. Background technique [0002] C.I Pigment Yellow 74 is a special organic pigment. C.I Pigment Yellow 74 gives a green light yellow tone. Its chemical structure belongs to monoazo pigments, and its coloring strength is higher than that of ordinary monoazo pigments. The pigment prepared by the red base B after the diazotization reaction and the coupling reaction of the o-methoxybisacetanilide solution, and then undergoes pigmentation treatment, due to the addition of surfactants and pigment derivative components during the production process, and The technology is relatively advanced, so that the light resistance of the finished pigment reaches 7 grades, with strong hiding power, high tinting power, good fluidity and good light fastness. Mainly used in self-drying paint, exterior wall paint water-based system. [0003] The conventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B51/00C09B29/33C09B67/36C09B67/14
CPCC09B51/00C09B29/33C09B67/0017C09B67/006C09B67/0079
Inventor 陆建伟沈叶江马婉君
Owner HANGZHOU HONGYAN PIGMENT CHEM
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