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Method for producing isoindoline yellow pigment

A technology of indoline yellow and a production method, applied in the directions of organic dyes, organic chemistry, etc., can solve the problems of high recovery cost, difficulty in recycling and high price, and achieve the effects of low production cost, convenient industrial production and little environmental pollution

Inactive Publication Date: 2013-09-11
CINIC CHEM SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The acids used in the above-mentioned patent documents all have organic acids (monoacids or dibasic acids), such as formic acid, acetic acid, succinic acid, etc. These organic acids have large consumption, high price, high recovery cost and are difficult to fully recover. Take advantage of other disadvantages

Method used

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  • Method for producing isoindoline yellow pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0018] In reactor, add 3717 grams of water, 1237g weight concentration is 20% hydrochloric acid, then add 256g (2 mole) barbituric acid and 145g (1 mole) 1,3-diiminoisoindoline, be warming up to 70 ℃, stirred and reacted for 15 hours, filtered, washed with 3000 g of hot water at 55 ℃ at 85 ℃, and dried at 110 ℃ for 10 hours to obtain 348.6 g of Pigment Yellow PY139 with a yield of 95%.

[0019] Wherein: the weight concentration of hydrochloric acid aqueous solution is 4.99%; The weight of hydrochloric acid is 0.97 times of barbituric acid.

Embodiment 2

[0021] In reactor, add 3717 grams of water, 294g weight concentration is 20% hydrochloric acid, then add 256g (2 mole) barbituric acid and 145g (1 mole) 1,3-diiminoisoindoline, be warming up to 60 °C, stirred for 10 h, filtered, washed with 3000 g of hot water at 8550 °C, and dried at 110 °C for 10 h to obtain 348.6 g of Pigment Yellow PY139 with a yield of 90%.

[0022] Wherein the weight concentration of hydrochloric acid aqueous solution is 1.47%; The weight of hydrochloric acid is 0.23 times of barbituric acid.

Embodiment 3

[0024] Substitute 1237g of 20% hydrochloric acid with 539g of 20% hydrochloric acid by weight concentration, repeat Example 1, and the yield is 92%.

[0025] Wherein the weight concentration of hydrochloric acid aqueous solution is 2.69%; The weight of hydrochloric acid is 0.23 times of barbituric acid.

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Abstract

The invention discloses a method for producing an isoindoline yellow pigment. The method comprises the following steps of: adding barbituric acid and 1,3-diimino-isoindoline into an inorganic acid aqueous solution to react for 1-30 hours at 10-100 DEG C; and then collecting a pigment yellow PY139 as shown by a formula (1) from reaction products. The method has very obvious beneficial effects as follows: low-cost inorganic acid replaces organic acid, wastewater is easy to treat and does not need to be recycled, the production cost is low, the environmental pollution is little, the energy consumption is low, and industrial production is facilitated. A chemical reaction equation is as shown in the specification.

Description

technical field [0001] The invention relates to a new production process of isoindoline yellow pigment. Background technique [0002] Pigment Yellow P.Y.139 belongs to isoindoline pigments, red light yellow, used in plastics, coatings and inks. Since this kind of pigment has intermolecular and intramolecular hydrogen bonds, and forms a three-dimensional network stacking, it has good solvent resistance, migration resistance, acid and alkali resistance, redox resistance and heat resistance. Except for individual documents, Pigment Yellow P.Y.139 is synthesized from 1,3-diiminoisoindoline and barbituric acid, and the main intermediate 1,3-diiminoisoindoline can be synthesized from phthalonitrile or o-phthalonitrile Synthesized from phthalic anhydride. [0003] DE2041999 reported the preparation of pigments by low-temperature reaction followed by heat treatment in DMF / HOAc. The obtained pigments were rough, with low hiding power, fine particles but agglomerated, and spots. US...

Claims

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Application Information

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IPC IPC(8): C09B67/20C07D403/14
Inventor 李秀娟陈文忠
Owner CINIC CHEM SHANGHAI
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