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Zinc-ferrit pigments stable against reduction, method for making and use of said pigments

A technology of zinc ferrite and pigments, which is applied in food preparation, pigment slurry, chemical instruments and methods, etc., can solve problems such as dark colors, and achieve the effect of energy saving

Active Publication Date: 2006-08-23
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of these zinc ferrite pigments is that they are too dark in color

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 783 g of a homogeneous aqueous suspension containing 45 g of goethite and 23.7 g of zinc oxide (containing 99.8% by weight of ZnO) was filtered, 0.73 g of lithium carbonate was added to the filter cake, which contained approximately 32% by weight of dry For the solid, the ingredients are intimately mixed in a suitable mixing equipment, and the mixture is calcined at 850°C for approximately 30 minutes. After cooling, the slag containing 0.2% by weight of lithium was crushed. This produces a light-colored bright yellow-brown pigment. The titration analysis of the slag through acid consumption and potential measurement showed that the iron content was 63.8%.

[0054] Inspection of the reduction stability and color shift of the obtained pigment:

[0055] Prepare a test sample. Here, HDPE (prepared according to DIN 53772 of September 1981) containing 1% by weight of pigments is fed into a twin-screw extruder and Arburg machine.

[0056] The color shift is measured according to D...

Embodiment 2

[0063] A 783 g homogeneous aqueous suspension containing 45 g of goethite and 23.7 g of zinc oxide (containing 99.8% by weight of ZnO) was filtered, and 1.46 g of lithium carbonate was added to the filter cake, which contained approximately 32% by weight of dry For the solid, the ingredients are intimately mixed in a suitable mixing equipment, and the mixture is calcined at 850°C for approximately 30 minutes. After cooling, the slag containing 0.4% by weight of lithium was crushed. This produces a light-colored bright yellow-brown pigment. Titration analysis of the slag by acid consumption and potentiometric analysis showed that the iron content in the slag was 63.4%.

[0064] The results of inspection of the reduction stability and color shift of the obtained pigments:

[0065] Prepare a test sample. Here, HDPE (prepared according to DIN 53772 of September 1981) containing 1% by weight of pigments is fed into a twin-screw extruder and Arburg machine.

[0066] The color shift is m...

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PUM

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Abstract

The present invention relates to zinc ferrite pigments, to a process for producing them and to their use. It relates in particular to pale, yellow zinc ferrite pigments featuring enhanced reduction stability.

Description

Technical field [0001] The invention relates to a zinc ferrite pigment, its preparation method and its use. In particular, it relates to a light yellow zinc ferrite pigment characterized by improved reduction stability. Background technique [0002] Zinc ferrite pigments are used for industrial purposes. [0003] According to the stoichiometric composition, additives, particle size, crystal habit and surface properties, zinc ferrite crystallized with spinel lattice can be used as the starting material, preservative or pigment of soft magnets. [0004] "Tan" pigment is a non-ferromagnetic pigment defined in English. [0005] US 3832455A1 discloses the preparation of zinc ferrite pigments. The precipitate attached to the zinc oxide or zinc carbonate from the iron(II) sulfate solution at a pH of 5-6 and a temperature of 49 to 52°C is filtered, the solid is washed, dried and calcined. [0006] According to US 2904395A1, zinc ferrite pigments are either obtained by precipitating from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/22C09D17/00D21H17/67A23L1/27C04B41/86A61K47/02A23L5/40
CPCC09C1/24C01G49/0063C03C1/04C01P2006/60
Inventor C·罗森哈恩U·克劳特R·-G·克尼希
Owner LANXESS DEUTDCHLAND GMBH