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Preparation method of C.I. pigment yellow 151

A technology of pigment yellow and molar weight, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of increasing product production cost, inconvenient production and use, and waste water, and achieves saving ice cost and reducing consumption. , the effect of reducing production costs

Active Publication Date: 2012-03-28
ANSHAN HIFICHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method consumes a large amount of acid, alkali and ice, and produces a large amount of waste water at the same time, which improves the production cost of the product
In addition, anthranilic acid, as a controlled precursor chemical raw material, has relatively strict procurement, transportation, storage and other links, which brings inconvenience to production and use

Method used

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  • Preparation method of C.I. pigment yellow 151

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preparation example Construction

[0021] The present invention provides a kind of preparation method of C.I. Pigment Yellow 151, the method comprises the following steps:

[0022] (1) 5-Acetoacetamidobenzimidazolone (AABI) is added to the anthranilic acid alkaline aqueous solution obtained by the co-current continuous synthesis preparation method, wherein the molar amount of anthranilic acid is equal to or slightly lower than The molar weight of 5-acetoacetamido benzimidazolone, stirring makes 5-acetoacetamido benzimidazolone dissolve completely, adds nitrite, in terms of nitrite, the molar weight of nitrite is the same as that of 5-acetoacetamido The molar weight of benzimidazolone is equal, stirring makes nitrite dissolve completely;

[0023] (2) At a temperature of 0-60°C, add the mixed solution obtained in step (1) dropwise into the buffer solution prepared with weak acid salt and acid, the pH of the buffer solution is 3-6.5, and dropwise add The dilute aqueous solution of the acid, so that the pH of the ...

Embodiment 1

[0040] (1) Continuous preparation of sodium anthranilate solution

[0041] A continuous pipeline reactor, the inner diameter of the pipeline is 2mm, the length is 1200mm, there is a mixing chamber at the front end, and there are two feed inlets, the front section of the feed inlet is 100mm, cooled by cold water through a casing, and the remaining pipelines are insulated from heat.

[0042] Preparation of reaction components: A component contains 10 grams of phthalimide and 9 grams of sodium hydroxide per 100 milliliters of aqueous solution; B component contains 30 grams of sodium hypochlorite solution per 100 milliliters of aqueous solution (reaching 10% containing available chlorine), 10 grams of sodium hydroxide.

[0043] Component A was injected into the tube reactor at a flow rate of 30 ml / min, while component B was injected at a flow rate of 30 ml / min. The front section of the reaction pipeline is cooled with 20°C water, and the temperature of the materials in the rest ...

Embodiment 2

[0051] (1) Synthesis of pigments

[0052] Add 8.2 grams of anthranilic acid, 14.26 grams of 5-acetoacetamidobenzimidazolone (AABI), 7.2 grams of sodium hydroxide and 200 milliliters of water into a 500 milliliter beaker, and stir until fully dissolved. Add 4.15 g of sodium nitrite, and stir until the mixture is clear. Add 2 g of sodium acetate and 20 ml of water into a 500 ml three-necked flask, add an appropriate amount of 10% hydrochloric acid solution under stirring, and adjust the pH value to 5.5. Raise the temperature to 40°C, add the prepared mixed solution dropwise, and at the same time add dropwise 10% hydrochloric acid solution, keep the pH value between 5.5 and 6.5, and add all dropwise in about 2 hours. After the dropwise addition, keep warm at 40°C until the reaction ends. The temperature was raised to 80° C. and maintained for 1 hour. Filter, wash with water, and dry at 80° C. to obtain 22.1 grams of coarse dry pigment powder with a yield of 98%.

[0053] ...

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Abstract

The invention relates to a preparation method of C.I. pigment yellow 151, which comprises the steps of: taking phthalimide and NaOX as starting materials to prepare strong-basicity solution of o-aminobenzoic acid; dissolving a coupling component 5-acetyl acetamido benzimidazolone (AABI) in the strong-basicity solution without acid precipitation; diazotizing and coupling under a proper pH condition; synthesizing the pigment for once; and optionally pigmenting and surfacing to obtain the C.I. pigment yellow 151. The technology is simplified, the ice use cost is saved, the use level of acid and alkali is greatly reduced, the production waste water is greatly reduced, the good economic benefit is obtained, and the environmental harmfulness is greatly reduced.

Description

technical field [0001] The invention relates to a preparation method of a pigment, in particular to a preparation method of C.I. Pigment Yellow 151. Background technique [0002] C.I. Pigment Yellow 151 is a high-performance organic pigment, bright greenish yellow, with excellent light fastness (level 7-8), heat resistance (up to 260°C / 5 minutes in plastic), solvent resistance and other properties , and processing and application performance, mainly used for high-grade paint, ink, plastic (PS, PO, ABS, PVC, PC or PBT), rubber coloring and raw pulp coloring of synthetic fibers. [0003] The chemical structure of C.I. Pigment Yellow 151 belongs to benzimidazolone monoazo pigment. It is formed by coupling anthranilic acid as a diazo component with 5-acetoacetamidobenzimidazolone (hereinafter referred to as AABI). Its chemical structural formula is as follows: [0004] [0005] The conventional preparation method of C.I. Pigment Yellow 151 is: first dissolve the diazo comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/36
Inventor 黄海张继臣王贤丰于兴春
Owner ANSHAN HIFICHEM CO LTD
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