Powder paint composition and method for preparing same

Patent metadata

Field	Value
Publication number	US-9447290-B2
Application number	US-201314132288-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Sep 5, 2013
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

Disclosed is a powder paint composition of and a method for preparing the same. More particularly, the present invention relates to a powder paint composition including a powder paint prepared by physically attaching metallic particles to a powder resin, which exhibits no separation or aggregation of metallic particles when coated and significantly improves metallic texture owing to orientation of the metallic particles, and a method for preparing the same.

First claim

What is claimed is:

1. A method for preparing a powder paint composition having a polyester-based powder resin and metallic particles as main components, which comprises:
preparing a powder resin using a polyester-based powder resin and an epoxy powder resin;
heating the powder resin from about 15-30° C. to about 85-95° C.;
preparing a powder mixture by adding metallic particle flakes and a viscosity control resin to the heated powder resin;
attaching metallic particles to the powder resin by stirring the resulting mixture while maintaining a temperature at about 85-95° C.;
cooling the stirred mixture to about 15-30° C.; and
classifying the cooled mixture and separating and removing unattached metallic particles and unattached powder resin;
wherein said heating is performed for about 80-100 minutes, said cooling is performed for about 80-100 minutes.

2. The method for preparing a powder paint composition according to claim 1 , wherein the powder paint composition comprises about 30-40 wt % of a polyester powder resin, about 30-40 wt % of an epoxy powder resin, about 0.5-2 wt % of a silicon-modified acryl resin as a viscosity control resin, about 1-5 wt % of metallic particle flakes, about 0.5-15 wt % of a coloring pigment, about 10-20 wt % of an extender pigment and about 0.5-3 wt % of a curing agent, based on total weight of the powder paint composition.

3. The method for preparing a powder paint composition according to claim 2 , wherein the coloring pigment comprises about 0.1-1 wt % of carbon black and about 5-10 wt % of barium sulfate, based on the total weight of the powder paint composition.

4. The method for preparing a powder paint composition according to claim 2 , wherein the extender pigment is calcium carbonate.

5. The method for preparing a powder paint composition according to claim 1 , wherein said stirring is performed for about 5-20 minutes.

6. The method for preparing a powder paint composition according to claim 1 , wherein said classifying is performed based on an average particle diameter of about 15-70 μm and unattached metallic particle flakes and unattached powder resin particles are removed from the mixture.

7. A method for coating a powder paint composition, comprising:
applying the powder paint composition according to claim 1 on an article to be coated to form a film;
curing the resulting film;
forming a powder clear layer by applying a powder resin on the cured film; and
finishing coating by curing the powder clear layer.

8. The method for preparing a powder paint composition according to claim 1 , wherein the viscosity control resin is a silicon-modified acryl resin or an epoxy-modified acryl resin.

9. The method for preparing a powder paint composition according to claim 1 , wherein the powder paint composition further comprises about 0.1-1 wt % of a UV stabilizer and/or about 0.1-1 wt % of a pinhole inhibitor, based on total weight of the powder paint composition.

10. The method for preparing a powder paint composition according to claim 1 , wherein the metallic particle flakes are aluminum flakes.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Hwan Oh

Classifications

• C09D167/00

  Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• B05D7/536

  each layer being cured, at least partially, separately · CPC title

• C08L33/04

  Homopolymers or copolymers of esters {(C08L43/04 takes precedence)} · CPC title

• C08K2003/3045

  Sulfates · CPC title

• C09D5/035 Primary

  Coloring agents, e.g. pigments (C09D5/032 takes precedence) · CPC title