Liquid gel concentrate compositions and methods of use
View Patent ↗Certain aspects of the invention are drawn to formulations and methods of making a liquid gel concentrate composition. Such liquid gel concentrates are formed by admixing an alkali-swellable polymer with an alkaline swelling agent in an oil-based suspending agent. The invention also provides for gelled water fire suppressants produced by mixing a liquid gel concentrate composition with water and methods of using such fire suppressants for combating fires.
1. A liquid gel concentrate composition for forming a fire suppressant, the composition comprising an alkali swellable polymer, an alkaline swelling agent, and an oil-based suspending agent, wherein the liquid gel concentrate composition contains less than 0.5% water and forms a fire suppressant.
2. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkali swellable polymer is a high molecular weight crosslinked acidic polyacrylic polymer or copolymer.
3. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkali swellable polymer is a homopolymer of 2-propenoic acid crosslinked with polyalkenyl polyether.
4. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkali swellable polymer is selected from the group consisting of polyacrylic acid crosslinked with allyl sucrose, polyacrylic acid crosslinked with allyl pentaerithrytol, and polyacrylic acid crosslinked with both allyl sucrose and allyl pentaerithrytol.
5. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkali swellable polymer is present in an amount of from about 10 to about 30 percent by weight of the concentrate composition.
6. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkaline swelling agent is an amine with a pK a of greater than or equal to about 7.
7. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkaline swelling agent is an alkanolamine.
8. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkaline swelling agent is triethanolamine.
9. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkaline swelling agent is present in an amount of from about 10 to about 20 percent by weight of the concentrate composition.
10. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the oil-based suspending agent comprises one or more of the oils that results in a suspension that is pourable to at least 5° C.
11. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the oil-based suspending agent comprises a mineral oil, a vegetable oil, or a mixture thereof.
12. The liquid gel concentrate composition for forming a fire suppressant of claim 11 , wherein the vegetable oil is a seed oil.
13. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the oil-based suspending agent is present in an amount of from about 50 to about 80 percent by weight of the concentrate composition.
14. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkali swellable polymer is polyacrylic acid crosslinked with allyl sucrose, the alkaline swelling agent is triethanolamine, and the oil-based suspending agent comprises a mineral oil, a vegetable oil, or a mixture thereof.
15. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the alkali swellable polymer is polyacrylic acid crosslinked with allyl pentaerithrytol, or polyacrylic acid crosslinked with both allyl sucrose and allyl pentaerithrytol, the alkaline swelling agent is triethanolamine, and the oil-based suspending agent comprises a mineral oil, a vegetable oil, or a mixture thereof.
16. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the concentrate composition is pourable to at least 5° C.
17. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the composition further comprises a thinning agent selected from the group consisting of sorbitan trioleate, sorbitan monooleate, salts of dodecyl benzene sulphonates, and phospholipids.
18. The liquid gel concentrate composition for forming a fire suppressant of claim 1 , wherein the composition further comprises lecithin.
19. A method of making a liquid gel concentrate composition for forming a fire suppressant, the method comprising admixing an alkali swellable polymer with an alkaline swelling agent in an oil-based suspending agent to form a suspension of a liquid gel concentrate composition, wherein the resulting liquid gel concentrate composition contains less than 0.5% water and forms a fire suppressant.
20. The method of claim 19 , wherein the alkali swellable polymer is added to the suspending agent before the addition of the alkaline swelling agent to the suspending agent.
21. The method of claim 19 , wherein the alkali swellable polymer is a high molecular weight crosslinked acidic polyacrylic polymer or copolymer.
22. The method of claim 19 , wherein the alkaline swelling agent is an amine with a pK a of greater than or equal to about 7.
23. The method of claim 19 , wherein the alkaline swelling agent is an alkanolamine.
24. The method of claim 19 , wherein the oil-based suspending agent comprises a mineral oil, a vegetable oil, or a mixture thereof.