Method for preparing core-shell flaky aluminum powder-polyacrylic acid composite particles

Abstract

The invention discloses a method for preparing core-shell flaky aluminum powder / polyacrylic acid composite particles. The method comprises the following steps of: eluting fatty acid coated on the surface of an aluminum powder pigment by adopting an organic solvent at normal temperature, and performing centrifugal separation to obtain flaky aluminum powder; mixing the flaky aluminum powder, acrylic acid, initiator and dispersant, then transferring the mixture to a preheated reactor, and dripping water step by step in the reaction process; and performing centrifugal separation on the reaction product, and thus obtaining the core-shell flaky aluminum powder-polyacrylic acid composite particles. The core-shell flaky aluminum powder-polyacrylic acid composite particles have excellent acid corrosion resistance based on high metallic luster, are extremely low in hydrogen evolution, and are particularly suitable for water-based coatings.

Description

technical field

[0001] The invention relates to the technical field of surface treatment of metal pigments, in particular to a method for preparing core-shell flake aluminum powder-polyacrylic acid composite particles. Background technique

[0002] Flaky aluminum powder is a commonly used metal effect pigment, which has the characteristics of good dispersion, strong adhesion, lifelike silver-like color, good light reflection effect and long-lasting brightness. The silver color prepared from it is a symbol of wealth, power and auspiciousness, and has widely become an indispensable or even irreplaceable color in the fields of high-end color printing packaging, high-end decoration, automobile and motorcycle finish paint, and handicraft decoration.

[0003] The chemical properties of aluminum are lively, especially for micron-sized flake aluminum powder, which has small particle size and large specific surface area. The number of atoms on the surface of aluminum powder is large ...

Examples

Embodiment 1

[0021] (1) Add commercially available pigment aluminum powder (average particle size 13 microns) into methyl ethyl ketone at a mass ratio of 1:5 (pigment aluminum powder: methyl ethyl ketone) and slowly stir and wash for 0.5 hours. The cleaning and centrifugation operations are repeated three times. The amount of hydrogen evolution of the cleaned flake aluminum powder was 183.0 ml / (0.5 g of aluminum powder), and the coating gloss was 90.1 gloss units.

[0022] (2) Place the reactor equipped with a stirrer, reflux condenser and thermometer in a constant temperature water bath and heat to 95°C.

[0023] (3) In parts by mass, 1 part of flaky aluminum powder, 0.1 part of acrylic acid, 0.15 part of ammonium persulfate and 50 parts of isopropanol were uniformly mixed.

[0024] (4) Transfer the mixed solution to a reactor whose temperature has been kept at 95°C, add 2 parts of distilled water dropwise at a constant speed during the reaction, stop heating after 1 hour, and continue st...

Embodiment 2

[0027] (1) According to the mass ratio of 1:5 (pigment aluminum powder: cyclohexanone), add commercially available pigment aluminum powder (average particle size 10 microns) into cyclohexanone and stir at a slow speed for 0.5 hours, and repeat the cleaning and centrifugal separation operations three times . The hydrogen evolution amount of the cleaned flake aluminum powder was 182.0 ml / (0.5 g of aluminum powder), and the coating gloss was 90 gloss units.

[0028] (2) Place the reactor equipped with a stirrer, reflux condenser and thermometer in a constant temperature water bath and heat to 95°C.

[0029] (3) In terms of parts by mass, 1 part of flaky aluminum powder, 0.1 part of acrylic acid, 0.15 part of ammonium persulfate and 50 parts of absolute ethanol were uniformly mixed.

[0030] (4) Transfer the mixed solution to a reactor whose temperature has been kept at 95°C, add 2 parts of distilled water dropwise at a constant speed during the reaction, stop heating after 1 hou...

technical field

[0001] The invention relates to the technical field of surface treatment of metal pigments, in particular to a method for preparing core-shell flake aluminum powder-polyacrylic acid composite particles. Background technique

[0002] Flaky aluminum powder is a commonly used metal effect pigment, which has the characteristics of good dispersion, strong adhesion, lifelike silver-like color, good light reflection effect and long-lasting brightness. The silver color prepared from it is a symbol of wealth, power and auspiciousness, and has widely become an indispensable or even irreplaceable color in the fields of high-end color printing packaging, high-end decoration, automobile and motorcycle finish paint, and handicraft decoration.

[0003] The chemical properties of aluminum are lively, especially for micron-sized flake aluminum powder, which has small particle size and large specific surface area. The number of atoms on the surface of aluminum powder is large ...

Examples

Embodiment 1

[0021] (1) Add commercially available pigment aluminum powder (average particle size 13 microns) into methyl ethyl ketone at a mass ratio of 1:5 (pigment aluminum powder: methyl ethyl ketone) and slowly stir and wash for 0.5 hours. The cleaning and centrifugation operations are repeated three times. The amount of hydrogen evolution of the cleaned flake aluminum powder was 183.0 ml / (0.5 g of aluminum powder), and the coating gloss was 90.1 gloss units.

[0022] (2) Place the reactor equipped with a stirrer, reflux condenser and thermometer in a constant temperature water bath and heat to 95°C.

[0023] (3) In parts by mass, 1 part of flaky aluminum powder, 0.1 part of acrylic acid, 0.15 part of ammonium persulfate and 50 parts of isopropanol were uniformly mixed.

[0024] (4) Transfer the mixed solution to a reactor whose temperature has been kept at 95°C, add 2 parts of distilled water dropwise at a constant speed during the reaction, stop heating after 1 hour, and continue st...

Embodiment 2

[0027] (1) According to the mass ratio of 1:5 (pigment aluminum powder: cyclohexanone), add commercially available pigment aluminum powder (average particle size 10 microns) into cyclohexanone and stir at a slow speed for 0.5 hours, and repeat the cleaning and centrifugal separation operations three times . The hydrogen evolution amount of the cleaned flake aluminum powder was 182.0 ml / (0.5 g of aluminum powder), and the coating gloss was 90 gloss units.

[0028] (2) Place the reactor equipped with a stirrer, reflux condenser and thermometer in a constant temperature water bath and heat to 95°C.

[0029] (3) In terms of parts by mass, 1 part of flaky aluminum powder, 0.1 part of acrylic acid, 0.15 part of ammonium persulfate and 50 parts of absolute ethanol were uniformly mixed.

[0030] (4) Transfer the mixed solution to a reactor whose temperature has been kept at 95°C, add 2 parts of distilled water dropwise at a constant speed during the reaction, stop heating after 1 hou...