Claims
- 1. A method of repairing a defect to a structural member comprising;
- (a) applying a polyurethane/polyisocyanurate composition to a defect, said defect having present environmental water and said polyurethane/polyisocyanurate composition comprised of an organic polyisocyanate, a lubricating oil, and a polyol composition comprising:
- (i) one or more compounds having at least two isocyanate reactive hydrogens;
- (ii) a blowing agent comprised of water; and,
- (iii) optionally a polyurethane promoting catalyst, a surfactant, emulsifier, crosslinker, and/or trimerization catalyst; said lubricating oil comprised of a base stock having at least 55 weight percent carbon atoms in paraffinic form and no more than 10 weight percent carbon atoms in aromatic form; and,
- (b) foaming said composition to form a rigid polyurethane/polyisocyanurate foam.
- 2. The method of claim 1, wherein the amount of said oil is from 10 weight percent to 50 weight percent based on the weight of said polyol composition.
- 3. The method of claim 1, wherein the amount of said oil is from 20 weight percent to 35 weight percent based on the weight of said polyol composition.
- 4. The method of claim 1, wherein the blowing agent consists of water.
- 5. The method of claim 4, wherein the amount of water is from 0.01 to 1.0 weight percent based on the weight of the polyol composition.
- 6. The method of claim 1, wherein the obtained foam has a density variant no greater than 20 percent.
- 7. The method of claim 6, wherein the obtained foam has a density variant no greater than 5 percent.
- 8. The method of claim 1, wherein the base stock contains less than 7 weight percent aromatic hydrocarbons based on the weight of the base stock.
- 9. The method of claim 1, wherein the base stock has no more than 20 weight percent carbon atoms in naphthenic form based on the weight of the base stock.
- 10. The method of claim 1, wherein the base stock has a viscosity index in the range of from 95 to 105.
- 11. The method of claim 1, wherein the lubricating oil consists essentially of a motor grade oil base stock having a specific gravity no greater than 0.9050.
- 12. The method of claim 11, wherein the lubricating oil consists essentially of a motor grade oil base stock having a specific gravity no greater than 0.8900 and a Cleveland Open Cup flash point of at least 320.degree. F.
- 13. The method of claim 1, wherein the lubricating oil further contains 2 weight percent to 20 weight percent additives.
- 14. The method of claim 8, wherein the hydrocarbon oil is a motor oil within an SOCIETY OF AUTOMOTIVE ENGINEERS classification from 5W to 50.
- 15. The method of claim 1, wherein the component (i) consists essentially of a polyoxypropylene polyether polyol.
- 16. The method of claim 1, wherein the lubricating oil is added to the organic polyisocyanate prior to reaction with the polyol composition.
- 17. The method of claim 1, wherein the lubricating oil added to the polyol composition prior to reacting with the organic polyisocyanate.
- 18. The method of claim 1, wherein the rigid polyurethane/polyisocyanurate composition is poured or sprayed in the defect.
- 19. The method of claim 1, wherein the structural member comprises a wood hydropole, a railroad tie, or a roof.
Parent Case Info
This is a division of application Ser. No. 07/872,226, filed Apr. 22, 1992, now U.S. Pat. No. 5,405,885.
US Referenced Citations (12)
Divisions (1)
|
Number |
Date |
Country |
Parent |
872226 |
Apr 1992 |
|