Adhesive composition and article including the same
An adhesive composition (“composition”) comprises an epoxy resin, a binder, and a curing agent. Typically, the composition further comprises an aqueous solvent (e.g. water) such that the composition can be referred to as an aqueous adhesive composition. The epoxy resin is typically encapsulated to prevent premature cure of the composition. After rupture of the encapsulated epoxy resin, the composition cures to form an adhesive. The composition is useful for articles such as fasteners (e.g. nuts and bolts) such that it can be referred to as a fastener adhesive. Typically, the composition is disposed on a threaded surface of the fastener. The fastener can be used for an assembly in which the composition generally cures after installation of the fastener. To make the fastener, the adhesive composition can be applied on the threaded surface. After application, the composition can be dried in instances where the composition still includes the aqueous solvent.
1. An aqueous adhesive composition for forming a fastener adhesive, said aqueous adhesive composition comprising:
about 35 to about 45 parts by weight of a microencapsulated epoxy resin comprising a bisphenol F novolac epoxy resin;
about 5 to about 10 parts by weight of a binder comprising a polymeric amine;
about 8 to about 12 parts by weight of a curing agent comprising a tertiary amine, which is different from said binder; and
about 25 to about 50 parts by weight of an aqueous solvent comprising water;
each based on 100 parts by weight of said aqueous adhesive composition.
2. The aqueous adhesive composition as set forth in claim 1 , wherein said tertiary amine comprises at least one of:
i) 2,4,6-tris(dimethylaminomethyl)phenol;
ii) 1,3-Bis[3-(dimethylamino)propyl]urea; and
iii) dimethylamino(methyl)phenol.
3. The aqueous adhesive composition as set forth in claim 2 , wherein said binder comprises a polyethylenimine.
4. The aqueous adhesive composition as set forth in claim 2 , wherein said tertiary amine comprises said 2,4,6-tris(dimethylaminomethyl)phenol.
5. The aqueous adhesive composition as set forth in claim 4 , wherein said binder comprises a polyethylenimine.
6. The aqueous adhesive composition as set forth in claim 2 , wherein said tertiary amine comprises said dimethylamino(methyl)phenol.
7. The aqueous adhesive composition as set forth in claim 6 , wherein said binder comprises a polyethylenimine.
8. The aqueous adhesive composition as set forth in claim 2 , wherein said tertiary amine comprises said 1,3-Bis[3-(dimethylamino)propyl]urea.
9. The aqueous adhesive composition as set forth in claim 8 , wherein said binder comprises a polyethylenimine.
10. The aqueous adhesive composition as set forth in claim 1 , wherein said binder comprises a polyethylenimine.
11. The aqueous adhesive composition as set forth in claim 1 , further comprising an additive selected from the group consisting of pigments, surfactants, viscosity modifiers, and combinations thereof.
12. An adhesive composition formed by drying the aqueous adhesive composition as set forth in claim 1 .
13. An adhesive formed by curing the adhesive composition as set forth in claim 12 .
14. An article comprising:
a substrate having a surface; and
an adhesive composition disposed on said surface;
wherein said adhesive composition is as set forth in claim 12 .
15. A fastener comprising the article as set forth in claim 14 , wherein said substrate surface comprises a threaded surface.
16. The fastener as set forth in claim 15 , wherein said substrate is selected from the group consisting of bolts, nuts, screws, studs, stand-offs, plugs/caps, and combinations thereof.
17. An assembly including a fastener, wherein said fastener is as set forth in claim 16 and wherein said adhesive composition is cured to form an adhesive.
18. A method of making an article comprising:
providing a substrate having a surface;
providing an aqueous adhesive composition;
applying the aqueous adhesive composition to the surface of the substrate; and
optionally, drying the aqueous adhesive composition after applying to make the article;
wherein the aqueous adhesive composition is as set forth in claim 1 .