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Yellow bisazo pigment and preparation method

A disazo and pigment technology, applied in the field of disazo pigments, can solve problems such as price fluctuations, large contradictions between market supply and demand, and cost pressures

Inactive Publication Date: 2017-01-25
杭州百合辉柏赫颜料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What follows is that the market supply and demand of 2,5-dimethoxy-4-chloroacetoacetanilide, the coupling component used to produce the pigment, is quite contradictory. In recent years, the price has continued to fluctuate, causing cost pressures on pigment producers.

Method used

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  • Yellow bisazo pigment and preparation method
  • Yellow bisazo pigment and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: a kind of preparation method of yellow disazo pigment according to claim 1, carries out according to the following steps:

[0027] (1), prepare diazonium salt solution:

[0028] Add 20 parts by weight of 3,3'-dichlorobenzidine hydrochloride and 45 parts by weight of hydrochloric acid to 200 parts by weight of water for beating for 30 minutes, then quickly add 35 parts by weight of sodium nitrite for diazotization, Stir for 45 minutes, add a nitrite-removing substance to remove excess nitrous acid, stir for 15 minutes, add an adsorbent, and filter to obtain a diazonium salt solution;

[0029] (2), preparation of coupling solution:

[0030] Add 60 parts by weight of 2,4-dimethoxy-5-chloroacetoacetanilide to 150 parts by weight of water, and then add 25 parts by weight of an alkaline solution to dissolve 2,4-dimethoxy-5- Chloroacetoacetanilide was dissolved and stirred for 0.5 hour to obtain a clear coupling solution;

[0031] (3) Add 20 parts by mass of w...

Embodiment 2

[0042] Embodiment 2: a kind of preparation method of yellow disazo pigment according to claim 1, carries out according to the following steps:

[0043] (1), prepare diazonium salt solution:

[0044] Add 50 parts by weight of 3,3'-dichlorobenzidine hydrochloride and 100 parts by weight of hydrochloric acid to 300 parts by weight of water for beating for 60 minutes, then quickly add 70 parts by weight of sodium nitrite for diazotization, Stir for 70 minutes, add a nitrite-removing substance to remove excess nitrous acid, stir for 15 minutes, add an adsorbent, and filter to obtain a diazonium salt solution;

[0045] (2), preparation of coupling solution:

[0046] Add 80 parts by weight of 2,4-dimethoxy-5-chloroacetoacetanilide to 200 parts by weight of water, and then add 40 parts by weight of an alkaline solution to dissolve 2,4-dimethoxy-5- Chloroacetoacetanilide was dissolved and stirred for 0.8 hours to obtain a clear coupling solution;

[0047] (3) Add 70 parts by mass of w...

Embodiment 3

[0058] Embodiment 3: a kind of preparation method of yellow disazo pigment according to claim 1, carries out according to the following steps:

[0059] (1), prepare diazonium salt solution:

[0060] Add 80 parts by weight of 3,3'-dichlorobenzidine hydrochloride and 120 parts by weight of hydrochloric acid to 350 parts by weight of water for beating for 90 minutes, then quickly add 100 parts by weight of sodium nitrite for diazotization, Stir for 90 minutes, add a nitrite-removing substance to remove excess nitrous acid, stir for 15 minutes, add an adsorbent, and filter to obtain a diazonium salt solution;

[0061] (2), preparation of coupling solution:

[0062] Add 120 parts by weight of 2,4-dimethoxy-5-chloroacetoacetanilide to 300 parts by weight of water, and then add 65 parts by weight of an alkaline solution to dissolve 2,4-dimethoxy-5- Chloroacetoacetanilide was dissolved and stirred for ~1 hour to obtain a clear coupling solution;

[0063] (3) Add 100 parts by mass o...

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Abstract

The invention relates to a bisazo pigment, and in particular to a yellow bisazo pigment and a preparation method, which are applied to printing ink, plastics and coatings. The preparation method comprises the following steps: diazonium salt solution preparation; coupling solution preparation; mixed preparation. According to the preparation method disclosed by the invention, the color and the coloring intensity of a pigment finished product are increased.

Description

technical field [0001] The invention relates to a disazo pigment, in particular to a yellow disazo pigment and a preparation method, which are applied to inks, plastics and coatings. Background technique [0002] Yellow disazo pigment is prepared by coupling reaction of 3,3'-dichlorobenzidine diazonium salt and coupling component 2,4-dimethoxy-5-chloroacetoacetanilide (CAS.16715-80-3) have to. The chemical structure of the yellow disazo pigment belongs to benzidine pigments, and it is prepared by coupling benzidine derivatives with bisacetylacetanilide derivatives. Benzidine pigments generally show bright colors and have high tinting strength (usually more than twice that of monoazo pigments). [0003] Coupling component 2,4-dimethoxy-5-chloroacetoacetanilide in yellow disazo pigment and coupling component 2,5-dimethoxy-4-chloroacetoacetyl in C.I. Pigment Yellow 83 Anilines are isomers with similar chromogenic functional groups. Due to its bright color and good weather r...

Claims

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Application Information

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IPC IPC(8): C09B35/035C09B35/10C09B67/10
CPCC09B35/035C09B35/105C09B67/0015
Inventor 史景涛罗德亮冯梦龙韩辉杨烨超
Owner 杭州百合辉柏赫颜料有限公司
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