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Thin coating aluminum pigments, method for the production thereof, and use of said aluminum pigments

A technique of aluminium pigments, test methods, used in applications, pedicures, household appliances, etc.

Active Publication Date: 2006-06-07
ECKART GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Another serious disadvantage is that PVD pigments show a strong tendency to aggregate

Method used

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  • Thin coating aluminum pigments, method for the production thereof, and use of said aluminum pigments
  • Thin coating aluminum pigments, method for the production thereof, and use of said aluminum pigments
  • Thin coating aluminum pigments, method for the production thereof, and use of said aluminum pigments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] 3.1 kg of glass spheres (diameter: 2 mm), 310 g of white spirit, 93 g of aluminum pellets (average diameter < 8 μm) and 9.3 g of oleic acid were placed in a drum mill (length: 32 cm, width: 19 cm). Next, the mixture was milled at 57 rpm for 20 hours. The product was separated from the milling balls by washing with white spirit, followed by a wet sieving process on a 25 μm sieve to sieve the product. The sieved fines were suction filtered to remove the petroleum solvent and then made into a paste (approximately 70% solids) with petroleum solvent in a laboratory blender.

Embodiment 2

[0135] Grinding was carried out as described in Example 1, but with aluminum pellets having an average diameter < 6 µm, and the grinding time was 23 hours.

Embodiment 3

[0137] 5.0kg of steel balls (diameter: 1.1mm, weight 5.5mg), 160g of petroleum solvent, 150g of aluminum pellets (average diameter < 8μm) and 6g of oleic acid were placed in a drum mill (length: 32cm, width: 19cm). Next, the mixture was milled at 60 rpm for 20 hours. During sieving, the product was separated from the milling balls by thorough washing with petroleum solvent, followed by wet sieving on a 25 μm sieve to sieve the product. The sieved fines were suction filtered to remove the petroleum solvent and then made into a paste (approximately 70% solids) with petroleum solvent in a laboratory blender.

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Abstract

The invention relates to aluminum pigments which are at least partially coated with lubricants, wherein said aluminum pigment have a) a water coverage between 40,000 and 130,000 cm2 / g, b) a mean thickness h of less than 100 to 30 nm, as calculated from the water coverage as well as the h50 value determined from the cumulative breakthrough curve of a scanning electron microscope thickness count, c) as determined by a scanning electron microscope thickness count, a relative width of the distribution of thicknesses Deltah between 70% and 140%, which is calculated on the basis of the corresponding cumulative breakthrough curve of the relative frequencies according to the formula Delta ⁢ ⁢ h = 100 x h 90 - h 10 h 50 , , d) an aspect ratio d50 / h of more than 200, e) a roughness value of from 0.30 to 0.9, calculated from the specific surface area, as determined by the BET test method, and the water coverage according to the following formula BET value / 2xwater coverage. The invention also relates to a process for the manufacture of said aluminum pigments and to the use thereof.

Description

technical field [0001] The present invention relates to an aluminum pigment at least partially coated with a lubricant and a method for its preparation. The invention also relates to the use of the aluminum pigment. Background technique [0002] Aluminum pigments are efficient pigments characterized by their unique metallic luster and their great covering power. Due to the lamellar structure of this effective pigment, it can be oriented parallel to the substrate in the paint medium and produce a metallic effect due to the many individual microscopic mirrors. This metallic effect is very noticeable, especially in wet paint. For full-tone paints, this effect is due to a brilliance effect that depends on the angle of observation and / or angle of incidence, also known as "flop". Excellent flop properties are influenced by many properties of the pigment: its orientation, its particle size and particle size distribution, its surface texture (roughness) and edge texture all play ...

Claims

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Application Information

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IPC IPC(8): C09C1/64A61K8/26A61Q3/02B22F1/05C09D5/02C09D5/03C09D5/36C09D11/00C09D11/02
CPCA61K8/26A61K2800/43A61Q3/02C01P2004/54C01P2006/12C09C1/64C09C1/644C09D5/028C09D5/032C09D5/36C09D11/037C09D11/50B22F1/05
Inventor T·施莱格S·特鲁默F·亨莱因R·施奈德T·舒斯特
Owner ECKART GMBH & CO KG
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