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Preparation method of pigment orange 64 with high stability

A pigment orange, stability technology, applied in the field of preparation of pigment orange 64, to achieve the effect of shortening the crystallization precipitation time and increasing the stability

Pending Publication Date: 2022-07-12
GAOYOU HUABAO PIGMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is high stability, less pollution, and a relatively safe preparation method for a highly stable Pigment Orange 64

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The 5-amino-6-methyl benzimidazolone of 150kg, 262.5kg mass percent concentration are 25% hydrochloric acid and 1500kg water stirring and beating, put into large refrigeration cabinet and be cooled to -5-3 ℃, add 225kg mass percent concentration The 75% sodium nitrite solution is diazotized, and the excess sodium nitrite is eliminated at the end of the diazotization to obtain a diazonium salt solution.

[0018] 110kg of barbituric acid was dissolved in 220kg of sodium hydroxide aqueous solution with a mass percentage concentration of 31% and 2200kg of water, then 8.8kg of potassium aluminum sulfate dodecahydrate was added, and the temperature was adjusted to 15° C. to obtain a buffer solution.

[0019] The diazonium salt solution is added to the buffer solution for reaction, the pH value at the end of the coupling is 5, the temperature is raised to 100 ° C, the temperature is maintained for 1 hour, the filter is performed, the temperature is raised to 100 ° C for the sec...

Embodiment 2

[0022] 150kg of 5-amino-6-methylbenzimidazolone, 280.5kg mass percent concentration of hydrochloric acid and 1600kg water were stirred and beaten to be 25%, put into a large refrigeration cabinet and cooled to -2-2 ℃, add 242kg mass percent concentration The 75% sodium nitrite solution is diazotized, and the excess sodium nitrite is eliminated at the end of the diazotization to obtain a diazonium salt solution.

[0023] 118kg of barbituric acid was dissolved in 230kg of sodium hydroxide aqueous solution with a mass percentage concentration of 31% and 2350kg of water, then 10kg of potassium aluminum sulfate dodecahydrate was added, and the temperature was adjusted to 15° C. to obtain a buffer solution.

[0024] The diazonium salt solution was added to the buffer solution for reaction, the pH value after the coupling was 4.7, the temperature was raised to 100° C., the temperature was kept for 1.5 hours, the filtration was performed, the temperature was raised to 100° C. for the s...

Embodiment 3

[0027] 5-amino-6-methylbenzimidazolone of 150kg, 295kg mass percent concentration are 25% hydrochloric acid and 1700kg water stirring and beating, put into large refrigeration cabinet and be cooled to -2-2 ℃, add 240kg mass percent concentration 75% % sodium nitrite solution is diazotized, and the excess sodium nitrite is eliminated at the end of the diazonium to obtain a diazonium salt solution.

[0028] 125kg of barbituric acid was dissolved in 230kg of sodium hydroxide aqueous solution with a mass percentage concentration of 31% and 2430kg of water, then 13.7kg of potassium aluminum sulfate dodecahydrate was added, and the temperature was adjusted to 19° C. to obtain a buffer solution.

[0029] The diazonium salt solution is added to the buffer solution for reaction, the pH value at the end of the coupling is 5.6, the temperature is raised to 100 ° C, the temperature is maintained for 1.5 hours, filtered, the temperature is raised to 100 ° C for the second time, the temperat...

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Abstract

The invention relates to the technical field of pigment preparation, in particular to a preparation method of high-stability pigment orange 64, which comprises the following steps: S1, dissolving 5-amino-6-methylbenzimidazolone in water and hydrogen chloride, cooling to-5 to 3 DEG C, and diazotizing with a sodium nitrite solution to obtain a diazonium salt solution; s2, dissolving barbituric acid in an aqueous solution containing sodium carbonate and sodium hydroxide, and adding aluminum potassium sulfate dodecahydrate and OP-10 to obtain a buffer solution; s3, cooling the buffer solution to 15-25 DEG C; s4, slowly adding the diazonium salt solution into the buffer solution at a constant speed, carrying out a coupling reaction, heating, carrying out heat preservation for 1-3 hours, filtering, carrying out secondary heating, carrying out heat preservation, and carrying out secondary filtering, so as to obtain a pigment orange 64 pigment semi-finished product; and S5, adding an organic solvent into the pigment orange 64 pigment semi-finished product, pulping, carrying out suction filtration, washing, and drying to obtain the pigment orange 64 finished product. The invention provides the preparation method of the high-stability pigment orange 64 which is high in stability, relatively small in pollution and relatively safe.

Description

Technical field [0001] The present invention relates to the technical field of pigment preparation, and specifically refers to a preparation method of pigment orange 64 with high stability. Background technique [0002] Pigment Orange 64 is a very important orange organic pigment. It is a yellow light orange pigment with very high thermal stability. It is widely used in plastics and does not affect the molding size of plastics. It is also used in special purpose printing inks. At this stage, the raw materials used in this method of pigment synthesis have a certain degree of toxicity, causing certain harm to processing personnel and a certain degree of danger. Moreover, the pollution is relatively large during the preparation process, and the coloring stability of the finished product is not high. . Contents of the invention [0003] The technical problem to be solved by the present invention is a method for preparing pigment orange 64 with high stability, less pollution,...

Claims

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Application Information

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IPC IPC(8): C09B29/52C09B67/20
CPCC09B29/3673C09B67/0065Y02P20/10
Inventor 鲁彬
Owner GAOYOU HUABAO PIGMENT
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