US 11,739,237 B2
Nonaqueous sol-gel for adhesion enhancement of water-sensitive materials
James A. Moore, Gilbert, AZ (US); Daniel W. Huff, Scottsdale, AZ (US); and Dennis K. Kennedy, Mesa, AZ (US)
Assigned to THE BOEING COMPANY, Arlington, VA (US)
Filed by THE BOEING COMPANY, Chicago, IL (US)
Filed on Nov. 30, 2017, as Appl. No. 15/827,156.
Claims priority of provisional application 62/527,432, filed on Jun. 30, 2017.
Prior Publication US 2019/0002739 A1, Jan. 3, 2019
Int. Cl. C09D 1/00 (2006.01); C23C 18/12 (2006.01); C09D 5/00 (2006.01); C09D 7/40 (2018.01); C09J 9/00 (2006.01); B01J 13/00 (2006.01); C09J 11/06 (2006.01); C09J 5/02 (2006.01); C23C 22/73 (2006.01)
CPC C09J 9/00 (2013.01) [B01J 13/003 (2013.01); B01J 13/0065 (2013.01); C09D 1/00 (2013.01); C09D 5/00 (2013.01); C09J 5/02 (2013.01); C09J 11/06 (2013.01); C23C 18/122 (2013.01); C23C 18/1241 (2013.01); C23C 18/1254 (2013.01); C23C 22/73 (2013.01); C09D 7/40 (2018.01)] 18 Claims
OG exemplary drawing
 
1. A sol-gel formulation for an adhesive in contact with a steel substrate, the sol-gel formulation consisting of:
0.7 wt % to 5 wt % of an organosilane based on a total weight of the sol-gel formulation, wherein the organosilane is one or more of 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyldiisopropylethoxysilane, 3-glycidoxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, or 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane;
0.2 wt % to 5 wt % of a zirconium alkoxide based on the total weight of the sol-gel formulation;
15 wt % to 40 wt % of a corrosion inhibitor based on the total weight of the sol-gel formulation, the corrosion inhibitor selected from a group consisting of a compound represented by a formula R1—Sn—X—R2 wherein R1 is an organic group, wherein n is an integer greater than or equal to 1, wherein X is a sulfur or a metal atom, wherein R2 is an organic group, wherein one or both of the organic groups of R1 and R2 is a thiol group;
an acid stabilizer; and
an organic solvent,
wherein:
the sol-gel formulation has from 0 wt % to 1 wt % water content based on the total weight of the sol-gel formulation,
the sol-gel formulation has a pH from 2 to 5, and
a ratio of the zirconium alkoxide to the acid stabilizer is from 1:1 to 3:1.