Adhesive composition
An adhesive composition includes a first part comprising about 15 to about 60 wt % of an epoxy compound, about 35 to about 80 wt % of an epoxy novolac, and about 5 to about 25 wt % of an epoxy-based reactive diluent based on the total weight of epoxy compound, epoxy novolac, and reactive diluent; and a second part comprising less than about 20 wt % of a hydroxyaromatic solvent, about 80 to about 99 wt % of a Mannich base, and about 1 to about 20 wt % of a tertiary amine, based on the total weight of hydroxyaromatic solvent, Mannich base, and tertiary amine, the first and second parts being present in a volume ratio of about 0.8:1 to about 1.2:1. Additives to further enhance the properties may be included. A method of forming an adhesive layer includes applying the adhesive composition to a surface.
1. An adhesive composition comprising:
a first part comprising
about 15 to 30 wt % of a first epoxy compound,
about 30 to about 50 wt % of an epoxy novolac different from the first epoxy compound, and
about 7 to about 12 wt % of an epoxy-based reactive diluent different from the first epoxy compound and the epoxy novolac
based on the total weight of the first part; and
a second part comprising
about 1 to about 20 wt % of a hydroxyaromatic solvent,
about 80 to about 85 wt % of a Mannich base, and
about 5 to about 15 wt % of a tertiary amine,
based on the total weight of the hydroxyaromatic solvent, the Mannich base, and the tertiary amine,
the first and second parts being present in a volume ratio of about 0.8:1 to about 1.2:1;
wherein upon curing, the adhesive composition meets or exceeds all requirements of ICC-ES AC-308.
2. The adhesive composition of claim 1 , wherein the first epoxy compound is a bisphenol-based diepoxy compound including bisphenol-A epoxy, bisphenol-F epoxy, or a combination comprising at least one of the foregoing.
3. The adhesive composition of claim 1 , wherein the epoxy novolac comprises the reaction product of a phenolic compound with an aldehyde, wherein phenolic hydroxy groups of the epoxy novolac are substituted with at least one glycidyl ether group.
4. The adhesive composition of claim 1 , wherein the epoxy containing reactive diluent is a C 6-30 aliphatic compound comprising two or more epoxy groups.
5. The adhesive composition of claim 1 , wherein the Mannich base is a C 6-30 organic compound comprising two or more primary amine groups.
6. The adhesive composition of claim 1 , wherein the tertiary amine is a C 6-30 compound comprising one or more tertiary amine groups.
7. The adhesive composition of claim 1 , wherein the first part, second part, or both the first and second parts further comprise an additive including filler, pigments, dyes, suspension agents, or a combination comprising at least one of the foregoing additives.
8. An adhesive layer comprising the cure product of the adhesive compound of claim 1 .
9. The adhesive layer of claim 8 , wherein the cure product forms after combining the first and second parts.
10. A method of forming an adhesive layer comprising:
combining the first part and the second part of the adhesive composition of claim 1 ,
applying the adhesive composition to a surface.
11. An adhesive composition comprising:
a first part comprising
about 15 to about 30 wt % of a first epoxy compound, wherein the first epoxy compound is a bisphenol-based diepoxy compound including bisphenol-A epoxy, bisphenol-F epoxy, or a combination comprising at least one of the foregoing,
about 30 to about 50 wt % of an epoxy novolac different from the first epoxy compound, wherein the epoxy novolac comprises the reaction product of a phenolic compound with an aldehyde, wherein phenolic hydroxy groups of the epoxy novolac are substituted with at least one glycidyl ether group, and
about 7 to about 12 wt % of an epoxy-based reactive diluent different from the first epoxy compound and the epoxy novolac, wherein the epoxy containing reactive diluent is a C 6-30 aliphatic compound comprising two or more epoxy groups,
based on the total weight of first part; and
a second part comprising
less than about 20 wt % of a hydroxyaromatic solvent,
about 80 to about 99 wt % of a Mannich base, and
about 1 to about 20 wt % of a tertiary amine,
based on the total weight of hydroxyaromatic solvent, Mannich base, and tertiary amine, the Mannich base and the tertiary amine being present in a weight ratio of about 9:1 to about 8:1;
the first and second parts being present in a volume ratio of about 0.8:1 to about 1.2:1,
wherein upon curing, the adhesive composition meets or exceeds requirements of ICC-ES AC-308.