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Preparation method of azo pigment

An azo pigment and diazo liquid technology, applied in the field of pigment production, can solve the problems of poor thermal stability, decreased quality performance, complicated preparation process, etc., and achieve the effects of enhancing thermal stability and improving conversion rate

Active Publication Date: 2021-10-01
杭州映山花颜料化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many kinds of azo pigments, including monoazo pigments and disazo pigments; monoazo pigments refer to molecules containing only one azo group, and the manufacturing process is relatively simple. They are mainly used in general-quality latex paints, plastics, Printing inks and office supplies; disazo pigments refer to pigments containing two azo groups in the pigment molecule, which have good solvent resistance, but the preparation process is relatively complicated, and are generally used in printing inks and plastics
[0004] Through the above-mentioned related technologies, the current azo pigments have poor thermal stability, which leads to a decline in the quality and performance of azo pigments at a certain processing temperature

Method used

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  • Preparation method of azo pigment
  • Preparation method of azo pigment
  • Preparation method of azo pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of azo pigment, the concrete component that comprises and weight are as shown in table 2, are made by following steps:

[0040] S1: 2B acid, 20% by weight of ammonia and water are mixed and stirred at a stirring speed of 1000r / min, and the 2B acid is completely dissolved to obtain the first mixture;

[0041] S2: Add 30% by weight hydrochloric acid to the first mixture and mix and stir at a stirring speed of 500r / min. After stirring evenly, add ice cubes to cool down to 10°C, then add 30% by weight of sodium nitrite aqueous solution, add The speed is 12 parts by weight / min, the stirring speed is 800r / min, stir evenly, and obtain the diazonium liquid after keeping for 30min;

[0042] S3: Mix and stir 2,3-acid, 20% by weight sodium hydroxide and water at a stirring speed of 1000r / min. After stirring evenly, add a stabilizer and continue stirring at a stirring speed of 1000r / min. After stirring, a coupling liquid is obtained ;

[0043] S4: the diazonium liquid and ...

Embodiment 2

[0045] Embodiment 2: a kind of azo pigment, the difference with embodiment 1 is that concrete components and weight are different, and the concrete components and weight that comprise are as shown in table 2, comprise the following steps:

[0046] S1: 2B acid, 25% by weight of ammonia and water are mixed and stirred, the stirring speed is 1000r / min, and the 2B acid is completely dissolved to obtain the first mixture;

[0047] S2: Add 40% by weight of hydrochloric acid to the first mixture and mix and stir at a stirring speed of 500r / min. After stirring evenly, add ice cubes and cool down to 0°C, then add 35% by weight of sodium nitrite aqueous solution, add The speed is 12 parts by weight / min, the stirring speed is 800r / min, stir evenly, and obtain the diazonium liquid after keeping for 50min;

[0048] S3: Mix and stir 2,3-acid, 30% by weight sodium hydroxide and water at a stirring speed of 1000r / min. After stirring evenly, add a stabilizer and continue stirring at a stirring...

Embodiment 3

[0051] Embodiment 3: a kind of azo pigment, the difference with embodiment 1 is that in step S2, ice cubes are added to the first mixture, and the temperature is lowered to 7°C.

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Abstract

The invention relates to the technical field of pigment production, and particularly discloses a preparation method of an azo pigment, which comprises: mixing 100-120 parts by weight of 2B acid, 32-50 parts by weight of ammonia water with a weight percentage of 20-25%, and 1300-1500 parts by weight of water, adding 120-150 parts by weight of hydrochloric acid with a weight percentage of 30-40% after the 2B acid is dissolved, uniformly mixing, adding ice cubes to a temperature of 0-10 DEG C, then adding 100-130 parts by weight of a sodium nitrite aqueous solution with the weight percentage of 30-35% to obtain a diazonium solution; mixing 85-100 parts by weight of 2, 3-acid, 110-150 parts by weight of sodium hydroxide with the weight percentage of 20-30% and 1400-1800 parts by weight of water, adding 6-10 parts by weight of a stabilizer, and uniformly mixing to obtain a coupling solution; mixing the diazo liquid and the coupling liquid, controlling the pH value at the end point of the reaction to be 8-10, then adding 200-250 parts by weight of a calcium chloride aqueous solution, and then carrying out filter pressing, rinsing, drying, inspecting and packaging to obtain the azo pigment; wherein the stabilizer comprises at least one of palm wax and paraffin; and the azo pigment provided by the invention has the advantage of good thermal stability.

Description

technical field [0001] The present application relates to the technical field of pigment production, in particular to a preparation method of an azo pigment. Background technique [0002] Azo pigments are insoluble organic substances containing azo groups in their molecular structure. They are bright in color and low in price. They are widely used in rubber, plastics, coatings and other fields. [0003] There are many kinds of azo pigments, including monoazo pigments and disazo pigments; monoazo pigments refer to molecules containing only one azo group, and the manufacturing process is relatively simple. They are mainly used in general-quality latex paints, plastics, Printing inks and office supplies; disazo pigments refer to pigments containing two azo groups in the pigment molecule, which have good solvent resistance, but the preparation process is relatively complicated, and are generally used in printing inks and plastics. [0004] Through the related technologies menti...

Claims

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Application Information

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IPC IPC(8): C09B29/15
CPCC09B29/106
Inventor 李福明梁建明
Owner 杭州映山花颜料化工有限公司
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