EP0333725A1 - Film forming fluoroprotein foam concentrate - Google Patents

Film forming fluoroprotein foam concentrate

Info

Publication number
EP0333725A1
EP0333725A1 EP19870907433 EP87907433A EP0333725A1 EP 0333725 A1 EP0333725 A1 EP 0333725A1 EP 19870907433 EP19870907433 EP 19870907433 EP 87907433 A EP87907433 A EP 87907433A EP 0333725 A1 EP0333725 A1 EP 0333725A1
Authority
EP
European Patent Office
Prior art keywords
concentrate
mnm
surfactant
fluorinated
surface tension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP19870907433
Other languages
German (de)
English (en)
French (fr)
Inventor
Gerard Thompson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Croda International PLC
Original Assignee
Croda International PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Croda International PLC filed Critical Croda International PLC
Publication of EP0333725A1 publication Critical patent/EP0333725A1/en
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
    • A62D1/0071—Foams
    • A62D1/0078—Foams containing proteins or protein derivatives

Definitions

  • Three types of commercial foam concentrate are normally distinguished and indeed in the United Kingdom, there are three Defense Specifications to cover the three types, which are called protein, fluoroprotein and fluorochernical. The third is more commonly known as aqueous film-forming foam (abbreviated to AFFF).
  • Fluroprotein foam concentrates are normally prepared from protein concentrates by addition of a fluorosurfactant. This makes the foam more fluid and less affected by fuel pick-up, while maintaining foam quality as measured by expansion and drainage. However, the fluorosurf ctants used do not reduce surface tension sufficiently to produce surface films on the more volatile hydrocarbons.
  • Fluorochemical foam concentrates are prepared by combining a fluorosurfactant with a hydrocarbon surfactant, without the presence of protein. The surface tension and interfacial tension are both reduced sufficiently to give stable film production even on fuels of low surface tension. Fluorochemical foams are very fluid and fast-draining; they give more rapid extinction butless effective after- protection than protein or fluoroprotein foams.
  • a fire fighting foam concentrate comprises an aqueous mixture containing hydrolysed protein, a first fluorinated surfactant having a surface tension of 17 to 35 mNm at 0.1%, a second fluorinated surfactant having a surface tension of 15 to 20 preferably 15 to 17 mNm ⁇ at 0.1% and a non-fluorinated hydrocarbon surfactant.
  • Concentrates in accordance with this invention exhibit long term stability on storage and form effective fire fighting foams which give good after-protection and burnback properties.
  • a preferred concentrate has been found to meet the Defense Specifications for both fluoroprotein and fluorochemical foams and produces a long lasting foam blanket which adheres to hot vertical surfaces.
  • Concentrates in accordance with this invention have the advantage that there is no need for addition of divalent metal salts to enhance foam stability and fire resistance. Absence of significant amounts of divalent metals is beneficial in reducing sludge formation on prolonged storage, particularly at high temperatures.
  • Concentrates in accordance with this invention preferably include a solvent selected from: hexylene glycol, butyl cellosolve, butyl digol and others used in formulation of fluoroprotein foams. Use of hexylene glycol is especially preferred. An amount of 5 to 25% preferably 5 to 15% by weight may be employed, more preferably 7%.
  • Preferred concentrates also include up to 20%, preferably 15% by weight of sodium chloride. This has a beneficial effect on the properties and extinguishing effectiveness of the foam. Surfactants and solvents which develop acidity on storage at high temperatures e.g. 50°C, are preferably absent.
  • the first fluorinated surfactant has a preferred surface tension of 17 to 25 mNm " at 0.1%.
  • a non-ionic first surfactant is preferred.
  • suitable surfactants Although resistance to decomposition or reaction upon prolonged storage is important.
  • the oligomers disclosed in U.S. patent specification No. 4460480 and having suitable surface tensions may be employed.
  • Use of Lodyne K 78/22OB is preferred.
  • SURFLON S831 (Asahi Glass Co. Limited) or FOROFAC 1199 (Atochemie) may be employed.
  • Ionic medium tension surfactants which may be used include sodium perfl oroalkylphenoxysulphonates e.g. MD 313 (I.C.I. ).
  • the second fluorinated surfactant has a preferred surface tension of 15 to 18 more preferably 15 to 17 mNm at 0.1%.
  • Non-ionic surfactants are preferred, for example the oliogomers disclosed in U.S.patent specification No. 4460480 and having suitable surface tensions.
  • Use of LODYNE K 81'86 (Ciba Geigy Corporation) is preferred.
  • An amount of at least 0.15% by volume based on 100% active material may be used.
  • the non-fluorinated hydrocarbon surfactant preferably has an interfacial tension of 2-4 mNm after dilution and a surface tension of more than 25 mNm at 0.1%.
  • Use of sodium or ammonium salts of alkyl ether sulphates is preferred, for example having a C Constant to C-, ⁇ alkyl chain and 1 to 3 ethylene oxide units.
  • Preferred materials are C Q to C,, derivatives having 2 ethylene oxide units.
  • the preferred hydrocarbon surfactants are used in a smaller amount than are normally employed with AFFFs. This improves both the expansion and drainage properties. Very surprisingly the heat resistance and burn-back properties are improved. An amount of not greater than 0.6%, by volume based on 100% active material is preferred.
  • Concentrates in accordance with this invention may incorporate an inorganic salt, preferably sodium chloride, in an amount of up to 20% by weight. This enhances the properties of the foam and the extinguishing effectiveness thereof.
  • an inorganic salt preferably sodium chloride
  • the concentrate may be diluted in use to form an aqueous working solution for example having a surface tension of 15.0 to 17.0 preferably 15 to 16.5 mNm " .
  • a generally accepted dilution is 6.0% v/v but other dilutions, for example 3.0%, v/v, can be prepared. Concentrates for use at higher dilutions may be prepared using increased proportions of the ingredients.
  • the protein may comprise any protein used in formation of fire fighting foams, preferably hydrolysed keratin containing 15-25% protein, for example using calcium hydroxide.
  • An amount of 60-95% by volume, preferably 85% for 6.0% v/v dilution, may be employed.
  • Extinction 40 sees 100% Burnback 23.75 mins Formulation given above shows 30% and 52% improvement in extinction and burnback times respectively compared to the AFFF. It therefore exceeds specifications for DEF 42-22 and DEF 42-24.
  • Hydrocarbon Surfactant 0.5 % v /v Hydrolysed protein CH-(CH 2 )-_ 10 (0CH 2 CH 2 ) 2 S0 4 a 87.8 % W /w
  • EXAMPLE 6 The formulation described in Example 5 above was tested as a 6% solution on a larger fire of area 4.55 sq.m. using a 9 litre extinguisher, foam being applied continuously. 150 litres of petrol were used and a preburn of 1 minute allowed. Results were as follows:

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Peptides Or Proteins (AREA)
EP19870907433 1986-11-12 1987-11-12 Film forming fluoroprotein foam concentrate Ceased EP0333725A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868626983A GB8626983D0 (en) 1986-11-12 1986-11-12 Film forming fluoroprotein foam concentrate
GB8626983 1986-11-12

Publications (1)

Publication Number Publication Date
EP0333725A1 true EP0333725A1 (en) 1989-09-27

Family

ID=10607186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870907433 Ceased EP0333725A1 (en) 1986-11-12 1987-11-12 Film forming fluoroprotein foam concentrate

Country Status (4)

Country Link
EP (1) EP0333725A1 (da)
AU (1) AU8234587A (da)
GB (1) GB8626983D0 (da)
WO (1) WO1988003425A1 (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2737126B1 (fr) * 1995-07-27 1998-02-06 Atochem Elf Sa Emulseurs fluoroproteiniques formant film polyvalents
US6506806B2 (en) 2000-06-08 2003-01-14 E. I. Du Pont De Nemours And Company Reduction of surface tension

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1280508A (en) * 1969-09-04 1972-07-05 Chubb Fire Security Ltd Fire-extinguishing foam compounds
US3941705A (en) * 1972-05-23 1976-03-02 Produits Chimiques Ugine Kuhlmann Fire extinguishing compositions containing fluorinated surfactants
US4089804A (en) * 1976-12-30 1978-05-16 Ciba-Geigy Corporation Method of improving fluorinated surfactants
US4460480A (en) * 1980-03-13 1984-07-17 Ciba-Geigy Corporation Protein hydrolyzate compositions for fire fighting containing perfluoroalkyl sulfide terminated oligomers
JPS5836037B2 (ja) * 1980-06-27 1983-08-06 ダイキン工業株式会社 含フツ素界面活性剤組成物
EP0049958B1 (en) * 1980-09-30 1986-11-05 Angus Fire Armour Limited Fire-fighting compositions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8803425A1 *

Also Published As

Publication number Publication date
WO1988003425A1 (en) 1988-05-19
GB8626983D0 (en) 1986-12-10
AU8234587A (en) 1988-06-01

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19890511

AK Designated contracting states

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Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CRODA INTERNATIONAL PLC

17Q First examination report despatched

Effective date: 19910207

STAA Information on the status of an ep patent application or granted ep patent

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18R Application refused

Effective date: 19920911