Multifunctional coating for aircraft

Patent metadata

Field	Value
Publication number	US-9926453-B2
Application number	US-201013518764-A
Country	US
Kind code	B2
Filing date	Dec 22, 2010
Priority date	Dec 23, 2009
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A method for coating a surface comprises applying a layer of coating composition onto the surface, mechanically forming parallel ribs on the layer, and simultaneously polymerizing the layer with ultraviolet radiations. The coating composition comprises a mass percentage of urethan-acrylate oligomer, with an average molar mass in number between 1000 and 5000 g·mol −1 , between 35% and 75%. The coating composition further comprises a mass percentage of a diluting agent, copolymerizable with urethan-acrylate oligomers, between 15% and 60%, and a mass percentage of pyrogenic silica between 0.5% and 5%.

First claim

The invention claimed is:

1. A method for coating a substrate surface, comprising the steps of:
applying directly onto an aircraft's substrate surface, a layer comprising a composition of:
a mass percentage of urethane-acrylate oligomer, with an average molar mass in number between 1000 and 5000 gmol −1 , from 60% to 70%;
a mass percentage of a diluting agent, copolymerizable with the urethane-acrylate oligomer, from 15% to 33%;
a mass percentage of pyrogenic silica that has been treated for increasing the hydrophobicity of its surface, between 0.5% and 5%;
a polymerization photo-catalyst;

said layer having a thickness between 15 and 300 pm;
mechanically pressing a non-roller type, comb-shaped tool onto said layer on the aircraft's surface and moving said comb-shaped tool along said layer on the aircraft's surface to form parallel ribs having a sawtooth-shaped profile thereon, said parallel ribs having heights from 10 to 100 pm; and
polymerizing said layer with ultraviolet radiation from a UV source located above said layer simultaneously with the step of mechanically pressing and moving said comb-shaped tool to solidify said parallel ribs having said sawtooth-shaped profile on said layer.

2. The method of claim 1 , wherein the treated pyrogenic silica comprises a polydimethylsiloxy- or dimethylsiloxy-group, and the treated pyrogenic silica has a percentage of residual hydroxyl groups lower than or equal to 50% of an amount of hydroxyl groups present in the pyrogenic silica before treatment for increasing the hydrophobicity.

3. The method of claim 1 , wherein the pyrogenic silica before treatment for increasing the hydrophobicity has a specific surface area between 80 and 200 m 2 g −1 .

4. The method of claim 1 , wherein the composition has a mass percentage of at least one fluorinated compound, copolymerizable with the urethane-acrylate oligomer, between 0.5% and 5%.

5. The method of claim 4 , wherein the fluorinated compound is a hydrofluorocarbon, linear or branched, with an acrylate or methacrylate group.

6. The method of claim 1 , wherein the composition further comprises a polyhedral oligomeric silsesquioxane copolymerizable with the urethane-acrylate oligomer.

7. The method of claim 6 , wherein the polyhedral oligomeric silsesquioxane copolymerizable with the urethane-acrylate oligomer comprises at least one fluorinated group.

8. The method of claim 1 , wherein the diluting agent, copolymerizable with the urethane-acrylate oligomer, is tripropylene glycol diacrylate or 1,6-hexanediol diacrylate.

9. The method of claim 1 , wherein the treated pyrogenic silica comprises a polydimethylsiloxy- or dimethylsiloxy-group, and the treated pyrogenic silica has a percentage of residual hydroxyl groups lower than or equal to 25% of an amount of hydroxyl groups present in the pyrogenic silica before treatment for increasing the hydrophobicity.

Assignees

• Campazzi Elisa
• Galy Jocelyne
• Gaudin Franck
• Gerard Jean Francois
• Villatte Martine
• Airbus
• Inst Nat Sciences Appliquees Lyon

Inventors

• Campazzi Elisa
• Galy Jocelyne
• Gaudin Franck
• Gerard Jean-François
• Villatte Martine

Classifications

• C08G77/24

  halogen-containing groups · CPC title

• C09D5/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• C08G18/40

  High-molecular-weight compounds {(C08G18/2805 takes precedence)} · CPC title

• C08F290/067

  Polyurethanes; Polyureas · CPC title

• C08K3/36

  Silica · CPC title