A preparation method of brilliant blue light red organic pigment c.i.p.r.185

Abstract

The invention discloses a preparation method of a brilliant-blue-light red organic pigment C.I.P.R.185, belonging to the technical field of pigment preparation. The method comprises the following steps: carrying out diazo-reaction in an acetic acid system, and adding a surfactant in the process of diazotization and coupling component dissolution to facilitate the dispersion in the coupling process, wherein parallel-flow coupling is adopted, the buffer solution adopts an ammonium chloride-ammonia water system, and the pH value of the buffer system is controlled at 7-9; and washing after the coupling is finished, dispersing the press cake with water, adding a surfactant, carrying out pressure filtration, washing, drying and pulverizing to obtain the pigment finished product. The finished product pigment prepared by the method has the advantages of high purity, fewer impurities, high staining power, loose and soft particles and bright color light; and since no after-treatment is performed in the organic solvent, the invention greatly reduces the energy consumption, lowers the cost, reduces the consumption of inflammable and explosive materials, enhances the safety, has favorable economic benefit, and is suitable for popularization in production.

Description

technical field

[0001] The invention belongs to the technical field of pigment preparation, in particular to a method for preparing a brilliant blue light red organic pigment C.I.P.R.185. Background technique

[0002] C.I.P.R.185 belongs to azo pigments, its CAS.NO.: 51920-12-8, its molecular formula is as follows:

[0003]

[0004] Its molecules contain , so it is customarily called benzimidazolone pigments. Although they belong to azo pigments in chemical classification, their application performance and various fastnesses cannot be compared with other azo pigments; The fastness of the items is very good, and the main raw materials for the preparation are methanesulfonamide crixidin and naphthol ASBI. The basic chemical synthesis of C.I.P.R.185 is relatively simple and direct, but the difference between pigment chemistry and general fine chemical industry is that not only the product must be synthesized, but also its crystal form and particle original particle size a...

Examples

Embodiment 1

[0023] A method for preparing brilliant blue light red organic pigment C.I.P.R.185, comprising the following steps:

[0024] 1) Take 24.0g of methanesulfonamide crixidin, add it to 800mL of water, add 80g of acetic acid after dispersion, cool to 0°C, add NaNO with a concentration of 31% dropwise 2 to a slight excess; after stirring for 1-3 hours, add urea to remove excess NaNO 2 , then add 5% activated carbon for decolorization for 1 h, filter to obtain the diazonium salt filtrate and refrigerate for later use;

[0025] 2) Take 35g naphthol ASBI, add it to 800mL water, add 0.3g octadecane polyvinyl chloride ether, add KOH24g to dissolve after dispersion, and then filter to obtain the coupling component solution;

[0026] 3) Stir and mix 50g of ammonia water with a concentration of 27%, 90g of ammonium chloride, 2.5g of octadecane polyvinyl chloride ether and 1.5L of water, and adjust the temperature to 45°C to obtain a buffer solution;

[0027] 4) Add the diazonium salt filt...

Embodiment 2

[0030] A method for preparing brilliant blue light red organic pigment C.I.P.R.185 comprises the following steps:

[0031] 1) Take 24.0g of methanesulfonamide crixidin, add it to 800mL of water, add 80g of acetic acid after dispersion, cool to 0°C, add NaNO with a concentration of 31% dropwise 2 to a slight excess; after stirring for 1-3 hours, add urea to remove excess NaNO 2 , add 5% activated carbon for decolorization for 1 h, filter to obtain the diazonium salt filtrate and refrigerate for later use;

[0032] 2) Take 35g of naphthol ASBI, add it to 800mL of water, add 0.3g of octadecane polyoxyethylene ether, add KOH20g to dissolve after dispersion, and then filter to obtain the coupling component solution;

[0033] 3) Stir and mix 50g of ammonia water with a concentration of 27%, 90g of ammonium chloride, 3.5g of hexadecane polyoxyethylene ether and 1.5L of water, and adjust the temperature to 45°C to obtain a buffer solution;

[0034] 4) Add the diazonium salt filtrate...

Embodiment 3

[0037] A method for preparing brilliant blue light red organic pigment C.I.P.R.185 comprises the following steps:

[0038] 1) Take 24.0g of methanesulfonamide crixidin, add it to 800mL of water, add 90g of acetic acid after dispersion, cool to 0°C, add dropwise NaNO with a concentration of 31% 2 to a slight excess; after stirring for 1-3 hours, add urea to remove excess NaNO 2 , add 5% activated carbon for decolorization for 1 h, filter to obtain the diazonium salt filtrate and refrigerate for later use;

[0039] 2) Take 35g of naphthol ASBI, add it to 800mL of water, add 0.3g of octadecane polyoxyethylene ether, add KOH20g to dissolve after dispersion, and then filter to obtain the coupling component solution;

[0040] 3) Stir and mix 50g of ammonia water with a concentration of 27%, 90g of ammonium chloride, 3.5g of dodecane polyvinyl chloride ether and 1.5L of water, and adjust the temperature to 60°C to obtain a buffer solution;

[0041] 4) Add the diazonium salt filtrat...

technical field

[0001] The invention belongs to the technical field of pigment preparation, in particular to a method for preparing a brilliant blue light red organic pigment C.I.P.R.185. Background technique

[0002] C.I.P.R.185 belongs to azo pigments, its CAS.NO.: 51920-12-8, its molecular formula is as follows:

[0003]

[0004] Its molecules contain , so it is customarily called benzimidazolone pigments. Although they belong to azo pigments in chemical classification, their application performance and various fastnesses cannot be compared with other azo pigments; The fastness of the items is very good, and the main raw materials for the preparation are methanesulfonamide crixidin and naphthol ASBI. The basic chemical synthesis of C.I.P.R.185 is relatively simple and direct, but the difference between pigment chemistry and general fine chemical industry is that not only the product must be synthesized, but also its crystal form and particle original particle size a...

Examples

Embodiment 1

[0023] A method for preparing brilliant blue light red organic pigment C.I.P.R.185, comprising the following steps:

[0024] 1) Take 24.0g of methanesulfonamide crixidin, add it to 800mL of water, add 80g of acetic acid after dispersion, cool to 0°C, add NaNO with a concentration of 31% dropwise 2 to a slight excess; after stirring for 1-3 hours, add urea to remove excess NaNO 2 , then add 5% activated carbon for decolorization for 1 h, filter to obtain the diazonium salt filtrate and refrigerate for later use;

[0025] 2) Take 35g naphthol ASBI, add it to 800mL water, add 0.3g octadecane polyvinyl chloride ether, add KOH24g to dissolve after dispersion, and then filter to obtain the coupling component solution;

[0026] 3) Stir and mix 50g of ammonia water with a concentration of 27%, 90g of ammonium chloride, 2.5g of octadecane polyvinyl chloride ether and 1.5L of water, and adjust the temperature to 45°C to obtain a buffer solution;

[0027] 4) Add the diazonium salt filt...

Embodiment 2

[0030] A method for preparing brilliant blue light red organic pigment C.I.P.R.185 comprises the following steps:

[0031] 1) Take 24.0g of methanesulfonamide crixidin, add it to 800mL of water, add 80g of acetic acid after dispersion, cool to 0°C, add NaNO with a concentration of 31% dropwise 2 to a slight excess; after stirring for 1-3 hours, add urea to remove excess NaNO 2 , add 5% activated carbon for decolorization for 1 h, filter to obtain the diazonium salt filtrate and refrigerate for later use;

[0032] 2) Take 35g of naphthol ASBI, add it to 800mL of water, add 0.3g of octadecane polyoxyethylene ether, add KOH20g to dissolve after dispersion, and then filter to obtain the coupling component solution;

[0033] 3) Stir and mix 50g of ammonia water with a concentration of 27%, 90g of ammonium chloride, 3.5g of hexadecane polyoxyethylene ether and 1.5L of water, and adjust the temperature to 45°C to obtain a buffer solution;

[0034] 4) Add the diazonium salt filtrate...

Embodiment 3

[0037] A method for preparing brilliant blue light red organic pigment C.I.P.R.185 comprises the following steps:

[0038] 1) Take 24.0g of methanesulfonamide crixidin, add it to 800mL of water, add 90g of acetic acid after dispersion, cool to 0°C, add dropwise NaNO with a concentration of 31% 2 to a slight excess; after stirring for 1-3 hours, add urea to remove excess NaNO 2 , add 5% activated carbon for decolorization for 1 h, filter to obtain the diazonium salt filtrate and refrigerate for later use;

[0039] 2) Take 35g of naphthol ASBI, add it to 800mL of water, add 0.3g of octadecane polyoxyethylene ether, add KOH20g to dissolve after dispersion, and then filter to obtain the coupling component solution;

[0040] 3) Stir and mix 50g of ammonia water with a concentration of 27%, 90g of ammonium chloride, 3.5g of dodecane polyvinyl chloride ether and 1.5L of water, and adjust the temperature to 60°C to obtain a buffer solution;

[0041] 4) Add the diazonium salt filtrat...

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