Powder coating flow aid
A combination of polyester hydroxyl resin, polyethylene resin, and spherical glass flakes blended in conjunction with additional constituents such as polymeric curatives, degassing agents, blended and extruded as master batch and having introduced (3-aminoproply)trimethoxysilane and silica type carriers such as silicone dioxide at (45-55% active) reduces orange peel significantly.
1. A powder coating flow aid comprising:
Weight % Range
Polyethylene resin
about 3.1 to about 9.5
Polyester hydroxyl resin
about 35 to about 50.0
Polymeric curative
about 5.0 to about 10.0
Degassing agent
about 0.25 to about 2.0
Ricinoleic acid
about 0.5 to about 3.0
Glass Flake
about 20 to about 50
Silica Carrier
about 0.5 to about 5.0.
2. The flow aid of claim 1 wherein the polyethylene resin is ethylene-octene copolymer or a low density polyethylene resin.
3. The flow aid of claim 2 wherein the curative is a blocked cycloaliphatic, aliphatic or aromatic polyisocyanate.
4. The flow aid of claim 3 wherein the silica carrier is a 3-aminopropyl triethoxysilane.
5. A powder coating composition comprising a powder coating resin and the powder coating flow aid of claim 1 .
6. The powder coating composition of claim 5 wherein the flow aid is present in an amount of about 0.5 to 1.5%.
7. The powder coating composition of claim 5 wherein the powder coating resin is a thermosetting resin.
8. The powder coating composition of claim 7 wherein the thermosetting resin is selected from the group consisting of epoxy, epoxy-polyester, and TGIC-free polyester resins or combinations thereof.
9. The powder coating composition of claim 7 wherein the thermosetting powder coating resin is an epoxy resin.
10. The powder coating composition of claim 8 wherein the epoxy resin is a bisphenol A epoxy resin.
11. The powder coating composition of claim 8 wherein the thermosetting resin is an epoxy-polyester resin.
12. The powder coating composition of claim 5 wherein the flow aid includes:
Weight %
Polyethylene resin
about 6.2
Polyester hydroxyl resin
about 41.210
Polymeric curative
about 8.09
Degassing agent
about .5
Ricinoleic acid
about 1.5
Glass Flake
about 37.50
(3-Aminopropyl) triethoxysilane/Silicone Dioxide
about 5.0.
13. The flow aid of claim 1 wherein the flow aid comprises:
Weight %
Polyethylene resin
about 6.2
Polyester hydroxyl resin
about 41.210
Polymeric curative
about 8.09
Degassing agent
about .5
Ricinoleic acid
about 1.5
Glass Flake
about 37.50
(3-Aminopropyl) triethoxysilane/Silicone Dioxide
about 5.0.