High-strength yellow azo mixed pigment

A yellow azo, pigment technology, applied in the field of dyes, can solve the problems of low strength, hindering mass use, etc., and achieve the effect of high coloring strength, good brightness and high transparency

Active Publication Date: 2012-06-27
鞍山七彩化学股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, compared with benzidine pigments, the above-mentioned C.I. Pigment Yellow 175 and

Method used

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  • High-strength yellow azo mixed pigment
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  • High-strength yellow azo mixed pigment

Examples

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Example Embodiment

[0050] According to a second aspect of the present invention, there is provided a method for preparing the yellow azo hybrid pigment described in the first aspect. The method includes the following steps:

[0051] (1) Under acidic catalysis, dimethyl 2-nitroterephthalate is transesterified in alcohol to obtain 2-nitroterephthalic acid mixed esters of the following formulas (3) and (4)

[0052]

[0053] (2) Hydrogenation reduction of the above-mentioned 2-nitroterephthalic acid mixed esters to obtain the corresponding 2-aminoterephthalic acid mixed esters of the following formulas (5) and (6)

[0054]

[0055] (3) Diazotizing the above-mentioned 2-aminoterephthalic acid mixed ester at a temperature of 0-10°C;

[0056] (4) Dissolve 5-acetylacetamidobenzimidazolone as a coupling component in an aqueous solution of sodium hydroxide, add an emulsifier to obtain a coupling solution, and then add sodium bicarbonate to the bottom water of the coupling. At the temperature, the diazonium compou...

Example Embodiment

[0085] Example 1 Preparation of 2-aminoterephthalic acid mixed ester

[0086] Add 30 grams of dimethyl 2-nitroterephthalate to 300 milliliters of butanol, then add 0.1 grams of concentrated sulfuric acid and keep it under reflux for 5 hours. The resulting substance is detected by high performance liquid chromatography to contain 2-nitro-p-benzene. The mixed ester of dimethyl dicarboxylate and methyl 2-nitro-4-n-butoxycarbonyl benzoate, the content of the mixed ester is 99.3%, of which dimethyl 2-nitroterephthalate and 2-nitro The weight ratio of methyl 4-n-butoxycarbonylbenzoate is 95:5.

[0087] The temperature was lowered to normal temperature, the above reactants were added to the autoclave, 0.1 g of 3% palladium-carbon catalyst was added, and hydrogen was introduced at 110° C. and reacted at 0.2 mpa for 10 hours. The temperature is lowered to 90°C, and the palladium carbon catalyst is recovered by hot filtration. The mother liquor was collected, cooled to normal temperature,...

Example Embodiment

[0088] Example 2 Preparation of 2-aminoterephthalic acid mixed ester

[0089] Add 30 grams of dimethyl 2-nitroterephthalate to 300 ml of butanol, then add 0.15 g of concentrated sulfuric acid, and keep it under reflux for 11 hours. High performance liquid chromatography detects that it contains dimethyl 2-nitroterephthalate. The mixed ester of methyl ester and 2-nitro-4-n-butoxycarbonyl benzoate, the content of mixed ester is 99.8%, of which dimethyl 2-nitroterephthalate and 2-nitro-4- The weight ratio of methyl n-butoxycarbonyl benzoate is 85:15.

[0090] The temperature was lowered to normal temperature, the reactants were added to the autoclave, 0.1 g of 3% palladium-carbon catalyst was added, and hydrogen was introduced at 110° C. and reacted for 10 hours at 0.2 mpa. The temperature is lowered to 90°C, and the palladium carbon catalyst is recovered by hot filtration. The mother liquor was collected, cooled to normal temperature, allowed to stand for 5 hours, filtered, washed...

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Abstract

The invention relates to a yellow azo mixed pigment and a preparation method thereof. The yellow azo pigment with high tinting strength is obtained by the steps of: performing ester exchange on dimethyl 2-aminoterephthalate under appropriate conditions to obtain appropriate mixed ester, performing hydrogenation reduction on the mixed ester, diazotizing, and coupling the diazotized mixed ester which is subjected to with 5-acetoacetylaminobenzimidazolone or 7-acetylacetamido-6-methoxyquinoxaline which is taken as a coupling component under appropriate conditions. The pigment has high vividness, transparency, dispersity and heat resistance, and can be used for plastics, ink and coatings.

Description

technical field [0001] The invention relates to a dye, in particular to a yellow azo mixed pigment with high tinting strength and high transparency and a preparation method thereof. Background technique [0002] Azo pigments refer to organic pigments containing an azo group (-N=N-) in their chemical structure. Yellow azo pigments are a class of cheap organic pigments with high tinting strength. Yellow azo pigments have good light fastness and are suitable for use in paints and inks. However, when used in plastics, yellow azo pigments tend to bloom at high temperatures, resulting in reduced tinting strength and poor migration resistance. [0003] Benzidine yellow disazo pigments have high tinting strength and good migration resistance and heat resistance. C.I. Pigment Yellow 17 is a green-yellow benzidine pigment that is often used in plastics. Its heat-resistant temperature can reach 240°C. Because benzidine pigments will produce harmful substances (for example, 3,3'-di...

Claims

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Application Information

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IPC IPC(8): C09B67/22C09B67/20
Inventor 王贤丰于兴春梁铁夫张志群徐馨阳李岩黄海
Owner 鞍山七彩化学股份有限公司
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