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Method for preparing middle chrome pigment

A technology of pigment and chrome yellow, applied in the field of preparation of chrome yellow pigment in lead chromate, can solve the problems of poor heat resistance and light resistance, and achieve the effects of good heat resistance, cost reduction and easy dispersion

Inactive Publication Date: 2009-06-17
SHANGHAI YIPIN PIGMENTS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the past, medium chrome yellow pigments were mainly produced by the lead acetate method. Although the products produced by this process have stable performance and pure color, their heat resistance and light resistance are poor. At the same time, the chemical oxygen demand (COD) of wastewater generated during the production process Up to 10000mg / L, far higher than the 150mg / L wastewater discharge standard stipulated by the national environmental protection regulations

Method used

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  • Method for preparing middle chrome pigment
  • Method for preparing middle chrome pigment
  • Method for preparing middle chrome pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 1256 kg of lead nitrate solution with a concentration of 28% in the reaction tank, dilute it to 4000 L with water, start stirring, control the temperature at 20°C, and keep the pressure at normal pressure, and add sodium dichromate with a concentration of 60% in another batching tank 250 kg, 134 kg of 30% sodium hydroxide, 267 kg of 10% sodium carbonate, 3 kg of sodium hypochlorite, dilute with water to 1000L, add 2 / 3 of the diluted mixture into the reaction barrel, stir for about 20 minutes, and then Add the remaining third of the mixture and stir for about 10 minutes. Dilute 7 kg of sodium silicate to 40 L with water, slowly add it to the reaction tank, dilute 0.6 kg of sulfuric acid with a concentration of 90% to 40 L, add it to the reaction tank, stir for 30 minutes, add 44 kg of aluminum sulfate with a concentration of 50%, 140 kg of soda ash with a concentration of 10% was stirred for 20 minutes, and the pH at the end point was controlled at 7.0 to obtain a me...

Embodiment 2

[0024] Add 1,200 kg of 30% lead nitrate solution to the reaction tank, dilute it to 4,000 L with water, start stirring, control the temperature at 30°C, and keep the pressure at normal pressure, and add 55% sodium dichromate to another batching tank 282 kg, 175 kg of 25% sodium hydroxide, 148 kg of 15% sodium carbonate, and 5 kg of potassium permanganate were diluted with water to 1000 L, and two-thirds of the diluted mixed solution was added to the reaction tank, and stirred for 20 After about 10 minutes, add the remaining third of the mixture and stir for about 10 minutes. Dilute 9 kg of sodium silicate to 50 L with water, slowly add it to the reaction tank, dilute 0.9 kg of sulfuric acid with a concentration of 93% to 40 L, add it to the reaction tank, stir for 30 minutes, add 58 kg of aluminum sulfate with a concentration of 45%, 107 kg of sodium carbonate with a concentration of 15% was stirred for 20 minutes, and the pH at the end point was controlled at 7.2 to obtain a ...

Embodiment 3

[0026] Add 1051 kg of lead nitrate solution with a concentration of 35% in the reaction tank, dilute it with water to 4000L, start stirring, control the temperature at 40°C, and keep the pressure at normal pressure, and add sodium dichromate with a concentration of 45% in another batching tank 356 kg, 204 kg of 20% sodium hydroxide, 200 kg of 20% sodium carbonate, and 8 kg of hydrogen peroxide are diluted with water to 1000 L, and two-thirds of the diluted mixture is added to the reaction tank, and stirred for about 20 minutes. Add the remaining third of the mixture and stir for about 10 minutes. Dilute 13 kg of sodium silicate to 60 L with water, slowly add it to the reaction tank, dilute 1.1 kg of sulfuric acid with a concentration of 96% to 50 L, add it to the reaction tank, stir for 30 minutes, add 70 kg of aluminum sulfate with a concentration of 40%, 95 kg of sodium carbonate with a concentration of 20% was stirred for 20 minutes, and the pH at the end point was controll...

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Abstract

The invention provides a preparation method of medium chrome yellow pigments and includes the preparation process: firstly, solution of lead nitrate is added into a reaction bucket and is heated while being stirred; in addition, the solution of sodium dichromate, mixed solution and oxidizers composed of sodium carbonate and sodium hydroxide are added into a burdening bucket and are added into the reaction bucket after being diluted; after the reaction for 25 to 40 minutes, stabilizing treatment is done with sodium silicate, aluminium sulfate and sodium carbonate to form suspension liquid of the medium chrome yellow pigments and finally the pigment is prepared through filtering, potching and drying. The products produced with the method are strong in covering power, good in heat resistance and are easily dispersed. At the same time, chemical oxygen consumption of waste water in the production process reaches the amount of 25 to 35mg per litre, which is up to the national emission standard.

Description

technical field [0001] The invention relates to a preparation method of chrome yellow pigment in lead chromate Background technique [0002] Lead chromate pigment is a kind of bright yellow pigment, which has the advantages of strong hiding power, solvent resistance, heat resistance and high cost performance, so it accounts for 30% of the medium yellow road marking paint abroad, which requires a large amount of medium Chrome yellow pigment (a kind of lead chromate pigment), in addition to being used in ordinary paints, medium chrome yellow pigments are also used in iron printing inks and plastic inks that require high heat resistance and solvent resistance. The paint industry is also its main user , because of its bright color and strong hiding power, medium chrome yellow pigment is also widely used in advertising. [0003] In the past, medium chrome yellow pigments were mainly produced by the lead acetate method. Although the products produced by this process have stable p...

Claims

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Application Information

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IPC IPC(8): C09C1/34C09C3/06
Inventor 刘静萍刘雅芬
Owner SHANGHAI YIPIN PIGMENTS CO LTD
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