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Method for preparing isoindoline pigment

An isoindoline and pigment technology, which is applied in the field of preparation of isoindoline pigments, can solve the problems of poor heat resistance, light resistance, oxidation resistance and easy dispersibility, poor color light and tinting strength, low pigment yield and the like

Active Publication Date: 2010-02-24
宇虹颜料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of optimized preparation method of isoindoline pigments, to solve the problem of low yield of pigments in the prior art, poor brightness, shade and tinting strength in pigment coloring, heat resistance, light resistance and oxidation resistance. and poor dispersibility

Method used

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  • Method for preparing isoindoline pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0014] 1. Synthesis of pigments: In a 500ml four-neck bottle equipped with a reflux condenser and a thermometer, add 110g of formic acid and 10.24g (0.08mol) of barbituric acid, stir to form a suspension, and 1,3-diiminoisoind Add 5.8g (0.04mol) of indoline in 30 minutes, react at room temperature for 1h, adjust the pH value of the medium to 1.0, raise the temperature to 70°C and react for 3h, add 0.2g of 2,6-di-tert-butyl-p-cresol, continue to heat up to reflux, Reflux for 5 hours, filter with suction, recover the filtrate for reuse, and use the filter cake for later use.

[0015] 2. Configuration of surfactant solution: accurately weigh C 12-18 Add 0.28g of fatty alcohol polyoxyethylene ether (20) ether and 0.28g of SOLSPERSE 27000 into 5g of water, heat to dissolve and set aside.

[0016] 3. Pigmentation: Add 450g of water, pigment filter cake (25% solid content) and surfactant solution into a beaker, stir and dissolve, add 5% sodium hydroxide solution, adjust pH=5, heat u...

Embodiment 2

[0018] 1. Synthesis of pigments: In a 500ml four-necked bottle equipped with a reflux condenser and a thermometer, add 120g of formic acid and 12.5g (0.08mol) of N, N-dimethylbarbituric acid, and stir to form a suspension, 1, Add 5.8 g (0.04 mol) of 3-diiminoisoindoline in 30 minutes, react at room temperature for 1 hour, adjust the pH value of the medium to 1.0, raise the temperature to 80°C for 3 hours, add 0.2 g, continue to heat up to reflux, reflux reaction for 5h, suction filtration, recycle the filtrate, and use the filter cake for later use.

[0019] 2. Configuration of surfactant solution: accurately weigh C 12-18 Add 0.28g of fatty alcohol polyoxyethylene ether (20) ether and 0.28g of SOLSPERSE 27000 into 5g of water, heat to dissolve and set aside.

[0020] 3. Pigmentation: Add 450g of water, pigment filter cake (25% solid content) and surfactant solution into a beaker, stir and dissolve, add 5% sodium hydroxide solution, adjust pH=4.5, heat up to 100°C, Insulate ...

Embodiment 3

[0022] Same as Example 1, only use 5% sodium carbonate solution instead of 5% sodium hydroxide solution to obtain a yellowish pigment with a greener color than Example 1 when pigmenting.

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Abstract

The invention discloses a method for preparing an isoindoline pigment, and relates to a preparation method for a pigment. The method is characterized in that a raw material formula comprises the following components by mass: 102.4 to 153.6 grams of organic acid, 10.24 grams (0.08 mol) of barbituric acid (or derivatives thereof), 4.61 to 6.45 grams of 1,3-diiminoisoindoline, 0.10 to 0.41 gram of antioxidant, proper amount of (3 to 10 percent) alkali, 278 to 1,042.5 grams of water, and 0.15 to 1.5 grams of surfactant. The preparation method comprises the following steps: 1, pigment synthesis; 2,surfactant solution preparation; and 3, pigmentation. Compared with the traditional product, the pigment obtained by the formula and the preparation method has the advantages of good brilliance, highpigment yield and strong tinting strength; and the oxidation resistance and light resistance of the pigment in plastic application are further improved.

Description

Technical field: [0001] The invention relates to a method for preparing pigments, in particular to a method for preparing isoindoline pigments. Background technique [0002] Isoindoline pigments are one of the important varieties of organic pigments with practical value. The pigment molecules contain imino groups and carbonyl groups, which can form intermolecular hydrogen bonds, have obvious planarity, and have excellent heat resistance, light resistance, Solvent resistance. German patent DE1012406 introduces the preparation of yellow pigments by the reaction of 1,3-diiminoisoindoline and barbituric acid: add the hot water solution of 1,3-diiminoisoindoline to barbituric acid under stirring In the aqueous solution of ammonia, a yellow precipitate is formed under the action of ammonia gas, filtered, washed with methanol, and dried to obtain a yellow pigment; in US Patent No. 4,166,179, barbituric acid and its derivatives are mixed with water and acid at room temperature to o...

Claims

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Application Information

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IPC IPC(8): C09B57/04C09B67/20
Inventor 吕东军陈都方詹秀涛陈志文
Owner 宇虹颜料股份有限公司
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