Reactive roofing adhesive
View Patent ↗A two-part adhesive includes an A side, a B side, at least one of a polyurethane prepolymer and a diisocyanate, at least one polyol, at least one catalyst, and at least one chain extender. The two-part adhesive may include an adhesion promoter.
1. A two-part adhesive having an A side and a B side, the two-part adhesive comprising:
at least one of a polyurethane prepolymer and a diisocyanate present in the A side;
not more than two polyols present in the B side, wherein the weight ratio of the two polyols is at least 4:1;
at least one catalyst present in the B side;
a blowing agent present in an amount of less than 1 wt % of the B side; at least on adhesion promoter in at least one of the A side or the B side in an amount of about 10% to 50% by weight of the two-part adhesive and
wherein the A side and the B side of the two part adhesive are mixed in a volumetric ratio of 1:1 and the two part adhesive has a heat aged T-peel breakaway strength of at least about 1 pli.
2. The two-part adhesive of claim 1 , wherein
the at least one of a polyurethane prepolymer and a diisocyanate is present in the A side in an amount of 100% by weight of the A side composition;
a first polyol of the two polyols present in the B side in an amount from about 75% to about 89.73% by weight of the B side composition;
a second polyol of the two polyols is present in the B side in an amount from about 4% to about 19%;
the at least one catalyst is present in the B side in an amount from about 0.5% to about 5% by weight of the B side composition; and
the blowing agent is present in in an amount of 0.25% by weight of the two-part adhesive.
3. The two-part adhesive of claim 1 further comprising at least one adhesion promoter in at least one of the A side and the B side.
4. The two-part adhesive of claim 1 wherein the at least one of a polyurethane prepolymer and a diisocyanate is a prepolymer.
5. The two-part adhesive of claim 1 wherein the two polyols includes at least one of a multifunctional polyether polyol and a polyester polyol.
6. The two-part adhesive of claim 1 wherein the two polyols includes at least one of a polyether diol and a polyester diol.
7. The two-part adhesive of claim 1 wherein the at least one catalyst is a diazole.
8. The two-part adhesive of claim 1 wherein the at least one catalyst is an imidazole.
9. The two-part adhesive of claim 1 wherein the at least one catalyst is a 1-methylimidazole.
10. The two-part adhesive of claim 1 wherein the at least one catalyst is 2,2-dimorphorlinodiethylether.
11. The two-part adhesive of claim 1 wherein the at least one catalyst is a quaternary ammonium salt.
12. The two-part adhesive of claim 1 wherein the B side composition and the A side composition are pumpable.
13. The two-part adhesive of claim 1 wherein the B side composition and the A side composition are sprayable.
14. The two-part adhesive of claim 1 wherein the two-part adhesive has an application range from about 0° F. to about 190° F.
15. The two-part adhesive of claim 1 wherein the two-part adhesive composition has a balance of cure speed, adhesion strength, and tack.
16. The two part adhesive of claim 3 wherein the at least one adhesion promoter is selected from the group consisting of chlorinated paraffins and chlorinated polyolefins.