Two-part polyurethane adhesive for bonding insulation boards to a roof deck

1. A method for preparing an adhesive, the method comprising:

combining an isocyanate prepolymer with at least one trimerization catalyst including a potassium, sodium, or lithium p-nonylphenoxide, where said step of combining takes place at a temperature of from about 40° F. to about 100° F.

2. The method of claim 1 , where the isocyanate prepolymer is a reaction product of an excess of isocyanate reacted with an isocyanate-reactive compound.

3. The method of claim 2 , where the prepolymer is prepared by sequentially adding a mono-ol after an initial reaction between an isocyanate and an isocyanate-reactive compound.

4. The method of claim 3 , where said reaction takes place in the presence of a plasticizer.

5. The method of claim 1 , where the trimerization catalysts is potassium nonylphenoxide.

6. A method for preparing an adhesive, the method comprising:

combining an isocyanate prepolymer, a mono-ol, and a trimerization catalyst including a potassium, sodium, or lithium p-nonylphenoxide, where said step of combining takes place at a temperature of from about 40° F. to about 100° F.

7. The method of claim 6 , where the isocyanate prepolymer is a reaction product of an excess of isocyanate reacted with an isocyanate-reactive compound.

8. The method of claim 7 , where the prepolymer is prepared by sequentially adding a mono-ol after an initial reaction between an isocyanate and an isocyanate-reactive compound.

9. The method of claim 8 , where said reaction takes place in the presence of a plasticizer.

10. The method of claim 6 , where the trimerization catalysts is potassium nonylphenoxide.

11. The method of claim 1 , where said step of combining includes combining from about 0.5 to about 1.0 parts by weight trimerization catalyst per 30 parts by weight prepolymer.

12. The method of claim 6 , where said step of combining includes combining from about 0.5 to about 1.0 parts by weight trimerization catalyst per 30 parts by weight prepolymer.

13. The method of claim 1 , where said step of combining results in an adhesive have an initial-cream time of from about 0 to about 10 seconds, a final rise time of from about 1 to about 60 seconds, and a gel time from about 1 to about 10 minutes.

14. The method of claim 6 , where said step of combining results in an adhesive have an initial-cream time of from about 0 to about 10 seconds, a final rise time of from about 1 to about 60 seconds, and a gel time from about 1 to about 10 minutes.

15. The method of claim 1 , where said step of combining results in an adhesive characterized by a green strength that will overcome at least 12 pounds of force per 144 square inches at the edge of an adhered insulation board and at least 72 pounds of force per 144 square inches at the center of an adhered insulation board, a shear adhesion of at least 0.1 pounds per square inch after 15 seconds from application, and achieve a FM1–90 wind-resistance rating for isocyanate insulation.

16. The method of claim 6 , where said step of combining results in an adhesive characterized by a green strength that will overcome at least 12 pounds of force per 144 square inches at the edge of an adhered insulation board and at least 72 pounds of force per 144 square inches at the center of an adhered insulation board, a shear adhesion of at least 0.1 pounds per square inch after 15 seconds from application, and achieve a FM1–90 wind-resistance rating for isocyanate insulation.

17. A method for preparing an adhesive, the method comprising:

combining a compound bearing an isocyanate functionality with at least one trimerization catalyst including an alkali metal phenoxide, where said step of combining takes place at a temperature of less than 100° F., where the compound bearing an isocyanate functionality is contained within an A-side stream of reactants, where the catalyst is contained in a B-side stream of reactants, and where the B-side stream of reactants includes a solvent selected from the group consisting of acetone, toluene, and methyl ethyl ketone.

18. The method of claim 1 , where the isocyanate prepolymer is contained within an A-side stream of reactants, and where the catalyst is contained in a B-side stream of reactants, and where the B-side stream of reactants includes at least one additional ingredient selected from the group consisting of blowing agents, solvents, and plasticizers.

19. The method of claim 18 , where the B-side stream of reactants includes a solvent, and where the solvents is selected from the group consisting of acetone, toluene, and methyl ethyl ketone.

20. The method of claim 17 , where the at least one catalyst consists essentially of an alkali metal phenoxide.

21. The method of claim 17 , where the B-side stream further includes at least one additional ingredient selected from the group consisting of blowing agents and plasticizers.

22. The method of claim 21 , where the B-side stream includes a plasticizer selected from the group consisting of alkyl phthalates, diacid esters, epoxidized soybean oil, and methyl formate.