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Method for preparing medium-temperature-resistant iron oxide yellow pigment

A technology of iron oxide yellow and medium temperature resistance, applied in fibrous fillers and other directions, can solve the problems of long production cycle and low temperature resistance of iron oxide yellow, and achieve the effect of improving production efficiency and improving temperature resistance

Active Publication Date: 2015-02-04
ZHEJIANG HUAYUAN PIGMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a method for preparing a medium-temperature-resistant iron oxide yellow pigment. The preparation method utilizes a weak base to precipitate ferrous ions, and then hydrolyzes and oxidizes it to form hydroxyl oxidation Iron, and coating it, solves the problem of long production cycle of traditional iron oxide yellow process, and overcomes the difficulty of low temperature resistance of traditional iron oxide yellow

Method used

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  • Method for preparing medium-temperature-resistant iron oxide yellow pigment
  • Method for preparing medium-temperature-resistant iron oxide yellow pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0017] First, use a measuring cylinder to measure 2000ml of purified ferrous sulfate solution with a concentration of 35g / 100ml, place it in a 5000ml beaker, and start stirring, control the speed at 500 rpm, weigh 442g of ammonium carbonate powder, and slowly pour it into In the stirring ferrous sulfate solution, and the temperature is controlled at about 60°C, air is introduced, and the reaction is continued for 1 hour to obtain an off-white slurry.

[0018] Control the stirring speed at 600 rpm, the temperature at 60°C, and continue to react for two hours to obtain a yellow slurry, then adjust the temperature to 80°C, adjust the speed to 1400 rpm, and weigh 900g of aluminum sulfate The powder is slowly poured into the stirring yellow slurry, and the pH of the slurry is adjusted to 6.5 with a liquid caustic soda, and the coating reaction is carried out for 2 hours, followed by rinsing, pressure filtration, drying, and crushing to obtain heat-resistant oxidation Iron yellow pi...

Embodiment 2

[0021] First, measure 2000ml35g / 100ml of purified ferrous sulfate solution with a measuring cylinder, place it in a 5000ml beaker, and start stirring, control the speed at 500 rpm, weigh 425g of ammonium bicarbonate powder, and slowly pour it into the stirring In the ferrous sulfate solution, and the temperature is controlled at about 80 ° C, air is passed through, and the reaction is continued for 1 hour to obtain an off-white slurry.

[0022] Control the stirring speed at 600 rpm, the temperature at 60°C, react for two hours to obtain a yellow slurry, then adjust the temperature to 80°C, adjust the speed to 1400 rpm, weigh 1000g of sodium metaaluminate powder , slowly pour into the stirring yellow slurry, and use liquid alkali to adjust the pH of the slurry to 7.0, carry out coating reaction, last for 3 hours, carry out rinsing, press filtration, drying, crushing, and then the temperature-resistant iron oxide can be obtained yellow paint. The temperature resistance test of ...

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Abstract

The invention relates to a method for preparing a medium-temperature-resistant iron oxide yellow pigment. The method comprises the following steps of: (a) reacting a purified ferrous sulfate solution with carbonate, introducing air, controlling the PH to be 6.5-7.2, and reacting for 1 hour at the temperature of 55-65 DEG C, so as to obtain grey slurry; (b) controlling the revolution rate of a reaction vat to be 600 r / min, continuously introducing air, and continuously reacting for 2 hours, so as to form yellow slurry; and (c) controlling the internal temperature of the reaction vat to be 80 DEG C, adjusting the revolution rate to be 1,400 r / min, adding an aluminum salt, adjusting the PH to be 6.5-7.0, stirring for 2-3 hours, then, rinsing, carrying out pressure filtration, drying and crushing, thereby forming temperature-resistant iron oxide yellow. The period of the method for preparing the medium-temperature-resistant iron oxide yellow pigment is only about 8 hours, so that the production efficiency is increased greatly, and the temperature resistance of the product is improved. The iron oxide yellow pigment produced by the method disclosed by the invention can withstand the temperature of 260-280 DEG C and is not discolored or little discolored.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic powder materials, and in particular relates to a preparation method of temperature-resistant iron oxide yellow. Background technique [0002] Iron oxide yellow has good weather resistance and light resistance, as well as absorption and shielding effects on ultraviolet rays, so it is widely used in flash paints, inks, leather, transparent plastics, high-end automotive topcoats, food and drug coloring, and art paints. Iron oxide yellow can be calcined at high temperature to produce permein, and has good application prospects in the fields of fine ceramics, high magnetic recording materials, catalysts and bioengineering. [0003] Iron oxide yellow pigment is used as a pigment or colorant in various concrete prefabricated parts and building product materials, and is directly added to cement for application. Iron oxide yellow pigments are suitable for various paint coloring and protective subst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/24
Inventor 李金花竺增林冯阿荣沈辉廖金华倪亚娟
Owner ZHEJIANG HUAYUAN PIGMENT CO LTD