Aqueous fire-fighting foams with reduced fluorine content

Patent metadata

Field	Value
Publication number	US-9669246-B2
Application number	US-201113876460-A
Country	US
Kind code	B2
Filing date	Oct 3, 2011
Priority date	Oct 1, 2010
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

Aqueous film forming firefighting composition concentrates are provided that contain an effective amount of a monomelic zwitterionic or anionic C 6 perfluoroalkyl surfactant having a molecule weight less than 800 daltons. The compositions also contain an effective amount of a foam stabilizing agent, and an effective amount of at least one non-fluorinated surfactant. The composition has less than 0.8% F, and is substantially free of any surfactant containing a perfluoroalkyl group containing more than 6 carbon atoms. The composition meets Military Specification MIL-F-24385F.

First claim

We claim:

1. An aqueous film-firefighting composition concentrate comprising:
(a) an effective amount of a monomeric C 6 perfluoroalkyl surfactant having a structure represented by the formula I:
R f —X—Y-L-Z  I:

wherein R f is C 6 straight or branched chain perfluoroalkyl;
X is C 2 -C 12 straight or branched chain alkylene, or C 2 -C 12 straight or branched chain alkenylene containing 1 or 2 alkene moieties;
Y is selected from the group consisting of:
 —S—CH 2 CH(R 1 )CON(R 2 )—, —O—CH 2 CH 2 —N(R 3 )(R 4 )—; —O—CH 2 CH(OR 5 )CH 2 —N(R 3 )(R 4 )—; —O—CH 2 CH(OR 5 )CH 2 —S—; —S—CH 2 CH(OR 5 )CH 2 —N(R 3 )(R 4 )—; and —S—CH 2 CH(OR 5 )CH 2 —S—;
 L is C 2 -C 12 straight or branched chain alkylene, where one carbon atom in the chain optionally is replaced by —N(R 6 )(R 7 )—; and
 Z is —OSO 3 − , —SO 3 − , or —CO 2 − ,

wherein R 1 , R 2 , R 3 , R 4 , R 6 and R 7 , independently are H or straight or branched chain C 1 -C 6 alkyl, and R 5 is H or straight or branched chain C 1 -C 6 alkyl or trialkylsilyl;
(b) an effective amount of a foam stabilizing agent, and
(c) an effective amount of at least one non-fluorinated surfactant,
wherein said composition has less than 0.8% F, and is substantially free of any surfactant containing a perfluoroalkyl group containing more than 6 carbon atoms and wherein said composition meets Military Specification MIL-F-24385F.

2. The composition according to claim 1 wherein said non-fluorinated surfactant is an anionic surfactant.

3. The composition according to claim 1 , wherein said foam stabilizing agent is a glycol ether.

4. The composition according to claim 1 , further comprising a corrosion inhibitor.

5. The aqueous film-firefighting composition concentrate according to claim 1 ,
wherein said composition does not contain an effective amount of a perfluorinated surfactant that does not conform to formula I.

6. The composition according to claim 1 , wherein Y is —S—CH 2 C(R 1 )CON(R 2 )—.

7. The composition according to claim 6 , wherein R 1 is H or straight chain alkyl and R 2 is H.

8. The composition according to claim 1 , wherein Y is —O—CH 2 CH 2 —N(R 3 )(R 4 )—.

9. The composition according to claim 8 , wherein R 3 and R 4 are H or methyl.

10. The composition according to claim 1 , wherein Y is —O—CH 2 CH(OR 5 )CH 2 —N(R 3 )(R 4 )—.

11. The composition according to claim 10 , wherein R 3 and R 4 are H or methyl, and R 5 is H or trialkylsilyl.

12. The composition according to claim 1 , wherein Y is —O—CH 2 CH(OR 5 )CH 2 —S—.

13. The composition according to claim 12 , wherein R 5 is H or trialkylsilyl.

14. The composition according to claim 1 , wherein Y is —S—CH 2 CH(OR 5 )CH 2 —N(R 3 )(R 4 )—.

15. The composition according to claim 14 , wherein R 3 and R 4 are H or methyl, and R 5 is H or trialkylsilyl.

16. The composition according to claim 1 , wherein Y is —S—CH 2 CH(OR 5 )CH 2 —S—.

17. The composition according to claim 16 , wherein R 5 is H or trialkylsilyl.

18. The composition according to claim 1 or claim 5 , further comprising an alkylpolyglycoside in the amount of 0.3 to 7%.

19. The composition according to claim 1 or claim 5 , further comprising a polysaccharide gum in an amount of 0.1 to 5%.

20. The composition according to claim 5 , comprising a plurality of perfluoroalkyl surfactants of the formula I.

21. The composition according to claim 1 or claim 5 , wherein said foam stabilizing agent is present in an amount of 1-50%, said non-fluorinated surfactant is present in an amount of 0.1 to 30% and said perfluoroalkyl surfactant or mixture of surfactants of formula I is present in an amount of 0.5 to 20%.

22. A fire-fighting foam, comprising a composition according to claim 1 or claim 5 , and an aqueous liquid.

23. The foam according to claim 22 , wherein said aqueous liquid is brackish water or seawater.

24. A method of making a fire-fighting foam, comprising foaming a composition according to claim 1 or claim 5 with an aqueous liquid.

25. The method according to claim 24 , wherein said aqueous liquid is brackish water or seawater.

Assignees

• Bowen Martina E
• Xie Yuan
• Havelka-Rivard Pamela A
• Tyco Fire Products Lp

Inventors

• Bowen Martina E
• Xie Yuan
• Havelka-Rivard Pamela A

Classifications

• A62D1/0071 Primary

  Foams · CPC title

• A62D1/0085 Primary

  containing perfluoroalkyl-terminated surfactant · CPC title

• A62D1/00 Primary

  Fire-extinguishing compositions; Use of chemical substances in extinguishing fires (fireproof paints C09D5/18; fireproofing materials C09K21/00) · CPC title