Concentration dependence of the microaggregates size in the oil in water microemulsion water - sodium dodecylsulfate - 1-pentanol - triethanolamine - 2-iodoheptafluoropropane and water - sodium dodecylsulfate - 1-pentanol - triethanol-amine - 1,2-dibromotetrafluoroethane

The possible usage of microemulsions for fire suppression is associated with a development and prospective employment of combined extinguishing agents which connect several mechanisms of burning termination, for example sharing water and chemically active inhibitors. But effective and chemically active inhibitors notably halohydrocarbons do not mix with water under ambient con¬ditions. Obtainment of the appropriate microemulsions may become the method of their con¬nec¬tion. In the present work the microemulsions water - sodium dodecyl sulfate - 1-pentanol - tri¬ethanol-amine - 2-iodoheptafluoropropane (IFP) and the water - sodium dodecyl sulfate - 1-pentanol - triethanol-amine - dibromotetrafluoroethane (BFE) of the “oil water” tipe at standard temperature were obtained and studied. It is known that at present BFE is used in fire extinguishing restrictedly due to high ozone-depleting potential. Therefore it would be reasonable to use and study new environmentally friendly halohydrocarbons. One of them is the IFP. The investigated microemulsions are characterized by approximately equal ratio surfactant + co-surfactant ( 21 wt. %) and different ratio between the amounts of oil and water. Determina-tion of the size of the microemulsions microdroplets and the study of their size distribution were performed by dynamic light scattering. It is shown that the structure of these microemulsions is characterized by the pre-sence of oil microdroplets in the aqueous dispersion medium. The size of the aggregates is situated in a fairly narrow range from 0.8 to 10 nm. With increasing of the halohydrocarbons content in microemulsion the position of the intensity maximum of the scattering light is shifting from 2 to 4.5 nm. The strongest increase in the size of the microdroplets is observed when the content of IFP above 4 wt. % and the content of BFE above 6 wt. %. The usage of obtained microemulsions as extinguishing agents may be appropriate by two reasons: first of all these are combined fire extinguishing agents in which the cooling effect of water is added to the inhibition of halohydrocarbons burning. Secondly, the microdroplets structure of microemulsions can enhance the extinguishing action of water by its breaking up at the evaporation of halohydrocarbons micro-droplets close to flame.

комбинированное огнетушащее средство, микроэмульсия, вода, поверхностно-активное вещество, галогенуглеводород, метод динамического рассеяния света, размер микрокапель

1. Холмберг К., Йёнссон Б., Кронберг Б., Линдман Б. Поверхностно-активные вещества и полимеры в водных растворах / Пер. с англ. - М. : Бином. Лаборатория знаний, 2007. - 528 с.

2. Ланге К. Р. Поверхностно-активные вещества: синтез, свойства, анализ, применение.-СПб. : Профессия, 2004.- 240 с.

3. Moulik S. P., Paul B. K. Structure, dynamics and transport properties of microemulsions // Advances in Colloid and Interface Science. - 1998. - Vol. 78, No. 2. - P. 99-195. DOI: 10.1016/s0001-8686(98)00063-3.

4. Grampurohit N., Ravikumar P., Mallya R. Microemulsions for topical use - A Review // Indian J. Pharm. Educ. Res. - 2011.- Vol. 45, No. 1. - P. 100-107.

5. Gupta S., Moulik S. P. Biocompatible microemulsions and their prospective uses in drug delivery // Journal of Pharmaceutical Sciences.-2008.-Vol. 97, No. 1.-P. 22-45. DOI: 10.1002/jps.21177.

6. Lin J.-C., Lee C.-P., Ho K.-C. Zinc oxide synthesis via a microemulsion technique: morphology control with application to dye-sensitized solar cells // Journal of Materials Chemistry. - 2012. - Vol. 22, No. 4. - P. 1270-1273. DOI: 10.1039/C1JM15227K.

7. Shtykov S. N. Chemical analysis in nanoreactors: Main concepts and applications // Journal of Analytical Chemistry. - 2002.- Vol. 57, No. 10. - P. 859-868. DOI: 10.1023/A:1020410605772.

8. Watarai H. Microemulsions in separation sciences // Journal of Chromatography A. - 1997. - Vol. 780, No. 1-2. - P. 93-102. DOI: 10.1016/S0021-9673(97)00444-5.

9. Синева А. В., Ермолатьев Д. С., Перцов А. В. Структурные превращения в микроэмульсии вода/ н-октан + хлороформ/додецилсульфат натрия/н-пентанол // Коллоидный журнал.-2007.- Т. 69, № 1. - С. 96-101.

10. Mukherjee K., Mukherjee D. C., Moulik S. P. Thermodynamics of microemulsion formation // Journal of Colloid and Interface Science.-1997.-Vol. 187, Nо. 2.-P. 327-333. DOI: 10.1006/jcis.1996.4696.

11. Батов Д. В., Мочалова Т. А., Петров А. В. Получение и изучение горючести микроэмульсий вода - ПАВ - со-ПАВ - 1,1,2,2-тетрафтордибромэтан // Пожаровзрывобезопасность. - 2012. - Т. 21, № 4. - С. 55-57.

12. Батов Д. В., Карцев В. Н., Штыков С. Н. Получение, теплоемкость и горючие свойства микроэмульсий вода - ПАВ - галогеноуглеводород, пригодных для создания комбинированных огнетушащих средств // Журнал прикладной химии. - 2012. - Т. 85, № 12. - С. 1218-1223.

13. Батов Д. В., Карцев В. Н., Штыков С. Н. Теплоемкость, электропроводность и структурные изменения микроэмульсий вода - додецилсульфат натрия - триэтаноламин - 1-пентанол - 1,1,2,2-тетрафтордибромэтан // Журнал структурной химии. - 2015. - Т. 56, № 2. - С. 282-287.

14. Копылов С. Н., Кольцов С. А., Игумнов С. М. Гептафторйодпропан как замена хладона 114В2 в пожаротушении и взрывопредупреждении // Пожарная безопасность. - 2005. - № 2. - С. 51-55.

15. Сайт журнала “Фторные заметки” (“Fluorine Notes Journal”). URL: http://notes.fluorine1.ru/cgi-bin/chladon/detail.cgi?query=ab00057 (дата обращения: 22.03.2016).

16. Weast R. C., Grasselli J. G. (eds.). CRC Handbook of Data on Organic Compounds. 2nd editon.-Boca Raton, FL. : CRC Press, Inc., 1989.

17. Patent 7004261 US. Microemulsion mists as fire suppression agents _ Adiga Kayyani C. (Macon, GA,US). Application number: 10_117669; publication date: 28.02.2006; filing date: 05.04.2002.