Coated iron oxide black pigment and preparation method thereof

A technology of iron oxide black and coating type, which is applied in the direction of chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of fading, limit the use range of iron oxide black, discoloration, etc., and achieve stable performance and particle size The effect of narrow range and uniform particle size

Inactive Publication Date: 2021-02-02
YIXING YUXING IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron oxide black will be dehydrated and oxidized to iron red when the temperature reaches about 100°C. If iron oxide black is u

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023]Example 1

[0024]A method for preparing coated iron oxide black includes the following steps:

[0025](1) Add 1kg of iron oxide black filter cake and 2kg of water into the reaction vessel, stir evenly, and at the same time open the steam valve to raise the temperature to 85°C, and keep stirring, the stirring speed is 200rpm;

[0026](2) Prepare the additive aqueous solution: add 30g sodium carboxymethyl cellulose, 10g polyvinyl alcohol, 40g calcium lignosulfonate and 20g sodium hexametaphosphate into the reaction solution, add 1kg of water and stir evenly to obtain the additive aqueous solution; Add the aqueous additive solution to a reaction vessel containing iron oxide black, stir evenly, add the above-mentioned uniformly stirred slurry to a ball mill, and use a wear-resistant ceramic ball with a diameter of 20 mm for grinding. The ball mill speed is 500 rpm and the ball milling time is 5 hours. The material ratio is 5:1, and the iron oxide black dispersion liquid is prepared;

[0027]...

Example Embodiment

[0029]Example 2

[0030]A method for preparing coated iron oxide black includes the following steps:

[0031](1) Add 1kg of iron oxide black filter cake and 2kg of water into the reaction vessel, stir evenly, and at the same time open the steam valve to raise the temperature to 85°C, and keep stirring, the stirring speed is 200rpm;

[0032](2) Prepare additive aqueous solution: add 50g sodium carboxymethyl cellulose, 20g polyvinyl alcohol, 80g calcium lignosulfonate and 50g sodium hexametaphosphate into the reaction solution, add 4kg water and stir evenly to obtain the additive aqueous solution; Add the aqueous additive solution to a reaction vessel containing iron oxide black, stir evenly, add the above-mentioned uniformly stirred slurry to a ball mill, and use a wear-resistant ceramic ball with a diameter of 20 mm for grinding. The ball mill speed is 800 rpm, and the ball milling time is 5 hours. The material ratio is 10:1 to obtain iron oxide black dispersion;

[0033](3) Heat the iron oxide...

Example Embodiment

[0035]Example 3

[0036]A method for preparing coated iron oxide black includes the following steps:

[0037](1) Add 1kg of iron oxide black filter cake and 2kg of water into the reaction vessel, stir evenly, and at the same time open the steam valve to raise the temperature to 85°C, and keep stirring, the stirring speed is 200rpm;

[0038](2) Prepare additive aqueous solution: add 50g sodium carboxymethyl cellulose, 20g polyvinyl alcohol, 80g calcium lignosulfonate and 50g sodium hexametaphosphate into the reaction solution, add 4kg water and stir evenly to obtain the additive aqueous solution; Add the aqueous additive solution to a reaction vessel containing iron oxide black, stir evenly, add the above-mentioned uniformly stirred slurry to a ball mill, and use a wear-resistant ceramic ball with a diameter of 20 mm for grinding. The ball mill speed is 800 rpm, and the ball milling time is 5 hours. The material ratio is 10:1 to obtain iron oxide black dispersion;

[0039](3) Heat the iron oxide...

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Abstract

The invention discloses a coated iron oxide black pigment and a preparation method thereof, and belongs to the technical field of iron oxide black pigment preparation. The method comprises the following steps: (1) adding an iron oxide black filter cake and water into a reaction container, and uniformly stirring; (2) preparing an additive into an aqueous solution, adding the aqueous solution into areaction container, and mechanically ball-milling and dispersing to obtain an iron oxide black dispersion liquid; (3) heating the iron oxide black dispersion liquid, adding a soluble aluminum salt under a nitrogen atmosphere condition, heating, and controlling the temperature for coating; and (4) carrying out centrifugal separation, drying the filter material, and calcining to obtain the iron oxide black pigment coated with the aluminum layer. Air is isolated in the coating process, and black iron oxide is prevented from being oxidized in the coating process; the dispersion performance of theiron oxide black is improved by adopting the additive and a mechanical ball milling mode, and more stable dispersion liquid is obtained. The pigment is uniform in particle size, and the outer layer is coated with a layer of compact aluminum film, so that the pigment cannot be oxidized even at high temperature, and the performance of the pigment is more stable.

Description

technical field [0001] The invention belongs to the technical field of iron oxide black pigment preparation, and in particular relates to a coated iron oxide black pigment and a preparation method thereof. Background technique [0002] Iron-based pigments are important inorganic color pigments, and their annual output ranks first in inorganic color pigments. Iron oxide pigment is a kind of pigment with good dispersibility, excellent light resistance and weather resistance, and has simple chemical composition, non-toxic and pollution-free, and is widely used in paints and coatings in the construction industry. Iron oxide pigments mainly refer to colored pigments such as iron oxide black, iron yellow and iron brown based on iron oxide. [0003] Iron oxide black is referred to as iron black molecule, Fe 2 o 3 ·FeO, the chemical name is ferric oxide, belongs to spinel type, it has saturated blue ink light black, relative density is 4.73; its hiding power and coloring power ar...

Claims

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Application Information

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IPC IPC(8): C09C1/24C09C3/04C09C3/06C09C3/10
CPCC09C1/24C09C3/006C09C3/041C09C3/06C09C3/063C09C3/10
Inventor 陆云飞单淼
Owner YIXING YUXING IND & TRADE
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