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Method for preparing temperature-resistant iron oxide yellow by coating liquid phase at high temperature and under high pressure

An iron oxide yellow, high temperature and high pressure technology, applied in chemical instruments and methods, dyeing low molecular organic compound treatment, inorganic pigment treatment and other directions, can solve the problems of affecting temperature resistance, uneven coating, etc. , The effect of uniform coating and pure color

Inactive Publication Date: 2018-09-07
SHENGHUA GROUP DEQING HUAYUAN PIGMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of uneven coating of iron oxide yellow pigment, which affects the heat resistance performance, the first object of the invention is a method for preparing iron oxide yellow by coating at high temperature and high pressure in liquid phase. The method can be dissolved by adding glycerin After soaking in water, it adheres to the surface of the dispersed iron oxide yellow, making it difficult to agglomerate, making the coating of aluminum more uniform. In addition, the high temperature and high pressure reaction conditions can promote the improvement of coating efficiency, and its coating cycle is only ordinary iron oxide. 1 / 10-1 / 5 of the yellow coating period, further, the present invention coats a layer of dense aluminum oxide and zinc oxide layer on the iron oxide yellow to improve the heat resistance of iron oxide yellow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Take 750g of iron oxide yellow dry powder and add it to 14250g of water to make 15000g of iron oxide yellow slurry (volume is about 15L). 2. Place the prepared iron oxide yellow slurry in a high-speed dispersing and stirring machine for dispersing and stirring. The rotating speed is controlled at 500 R / min, and the dispersing time is 30-40 minutes.

[0018] 3. Al with a content of 98.5% mass fraction 2 (SO 4 ) 3 16H 2 O solid 404g was added into 1500g water and fully dissolved to prepare an aluminum sulfate solution with a mass fraction of 21.2%.

[0019] 4. Take reagent grade glycerol and zinc carbonate, the amount of glycerol is 20ml, and the amount of zinc carbonate is 30g.

[0020] 5. Put 15000g of iron yellow slurry prepared in step 1 in the reaction kettle, start stirring, control the stirring speed at 150R / min, slowly add 1904g of aluminum sulfate solution prepared in step 3, and control the adding time at about 180S , then add glycerol and zinc carbonate...

Embodiment 2

[0024] 1. Take 750g of iron oxide yellow dry powder and add it to 14250g of water to make 15000g of iron oxide yellow slurry (volume is about 15L). 2. Place the prepared iron oxide yellow slurry in a high-speed dispersing and stirring machine for dispersing and stirring. The rotating speed is controlled at 500 R / min, and the dispersing time is 30-40 minutes.

[0025] 3. Al with a content of 98.5% mass fraction 2 (SO 4 ) 3 16H 2 O solid 350g joins 1500g water and fully dissolves, is mixed with the aluminum sulfate solution that mass fraction is 21.2%.

[0026] 4. Take reagent grade glycerol and zinc carbonate, the amount of glycerol is 15ml, and the amount of zinc carbonate is 25g.

[0027] 5. Put 15000g of iron yellow slurry prepared in step 1 into the reaction kettle, start stirring, control the stirring speed at 150R / min, slowly add 1850g of aluminum sulfate solution prepared in step 3, and control the adding time at about 180S , then add glycerol and zinc carbonate pre...

Embodiment 3

[0031] 1. Take 750g of iron oxide yellow dry powder and add it to 14250g of water to make 15000g of iron oxide yellow slurry (volume is about 15L). 2. Place the prepared iron oxide yellow slurry in a high-speed dispersing and stirring machine for dispersing and stirring. The rotating speed is controlled at 500 R / min, and the dispersing time is 30-40 minutes.

[0032] 3. Al with a content of 98.5% mass fraction 2 (SO 4 ) 3 ·16H 2 440g of O solid was added into 1500g of water and fully dissolved to prepare an aluminum sulfate solution with a mass fraction of 21.2%.

[0033] 4. Take reagent grade glycerol and zinc carbonate, the amount of glycerol is 26ml, and the amount of zinc carbonate is 37g.

[0034] 5. Put 15000g of iron yellow slurry prepared in step 1 into the reaction kettle, start stirring, control the stirring speed at 150R / min, slowly add 1940g of aluminum sulfate solution prepared in step 3, and control the adding time at about 180S , then add glycerol and zinc ...

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Abstract

The invention relates to an iron oxide yellow pigment, in particular to a method for preparing iron oxide yellow by coating a liquid phase at high temperature and under high pressure. The method comprises the following steps: 1) putting prepared iron yellow slurry in a reaction kettle, slowly adding an aluminum sulfate solution while stirring, then adding glycerol and zinc carbonate into feed liquid in the reaction kettle to adjust the pH value of the feed liquid in the reaction kettle to 11 to 12, and closing a reaction kettle lid after the pH is stabilized; 2) starting to heating to 220 to 250 DEG C, and entering a heat preservation and pressure preservation state after the temperature in the reaction kettle reaches 220 to 250 DEG C; 3) preserving heat for 1 to 3 hours, turning off a heating power supply, but keeping stirring until cooling to 60 DEG C or below, opening the kettle lid, adjusting the pH to 7.5 to 8.5, performing rinsing and suction filtration after the pH is stabilized, drying at 100 to 120 DEG C, and finally crushing. The coated iron oxide yellow synthesized by the method has the advantages of high heat resistance, more uniform coating, simple synthetic method, low cost, safety, environmental friendliness and the like.

Description

technical field [0001] The invention relates to iron oxide yellow pigments, in particular to a method for preparing iron oxide yellow by liquid phase high temperature and high pressure coating. Background technique [0002] Iron oxide yellow, also known as iron oxyhydroxide, its molecular formula is FeOOH or Fe 2 o 3 ·H 2 O, in the form of yellow powder, its particle shape is needle-like, has high coloring power, hiding power, and is non-toxic and harmless. It is an environment-friendly inorganic pigment, and its light resistance reaches 6-7 grades. Iron oxide yellow pigments are widely used in building materials, coatings, paints, plastics, rubber, electronics, industrial catalysts, tobacco, cosmetics and other industries. [0003] The surface of ordinary iron oxide yellow is not coated, and the crystal water contained in it is easily lost at high temperature, thus turning into iron oxide red. At present, the coating technology of iron oxide yellow pigment is mainly the...

Claims

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Application Information

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IPC IPC(8): C09C1/24C09C3/06C09C3/08
CPCC01P2006/37C09C1/24C09C3/006C09C3/063C09C3/08
Inventor 李金花沈辉
Owner SHENGHUA GROUP DEQING HUAYUAN PIGMENT
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