Novel microencapsulated liquid fire extinguishers with a nanomodified microcapsule shell

Vilesov, A. D.; Suvorova, Olga; Yudin, V. E.; Сапрыкина, Н. Н.; Vilesova, M. S.; Stankevich, R. P.

doi:10.1134/s1560090414040125

Cited by 7 publications

(11 citation statements)

References 10 publications

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“…The polymer matrix must retain the properties of EFA during long-term storage (17) . It must protect EFA from high humidity, high temperature (In the range from a temperature above the boiling of a liquid fire extinguishing agent to the decapsulation temperature of EFA), ultraviolet radiation.…”

Section: Climate Tests Of Fire Extinguishing Composite Materials Contamentioning

confidence: 99%

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The Effect of Epoxy Resin on the Properties of Encapsulated Fire Extinguishing Agent

Alexandra¹,

Sergei²,

Lee³

et al. 2019

Fire Sci. Eng

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Firefighting methods and devices in the early stages of a fire in confined spaces is an actual problem (1). This problem is especially relevant in the field of microelectronics and electric power industry (2) , in particular in large-capacity energy storage devices (3) , batteries for electric vehicles and other devices where lithium-ion batteries (LIB) are used (4,5). The above articles indicate a large list of products subject to ignitionfrom small consumer electronics to large electric vehicles and airplanes. Although various safety devices have been incorporated into the commercial LIB cells, there have been numerous high-profile battery failure accidents, many of which caused significant adverse impacts for the cell manufacturers

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Section: Climate Tests Of Fire Extinguishing Composite Materials Contamentioning

confidence: 99%

“…Problem of low decapsulation rate and temperature can be solved in two ways. The first is the change in the properties of EFA by changing the synthesis mechanism (15,16) and the properties of the material shell (17) . The shell significantly affects the decapsulation process of EFA in a narrow time and temperature range.…”

mentioning

confidence: 99%

The Effect of Epoxy Resin on the Properties of Encapsulated Fire Extinguishing Agent

Alexandra¹,

Sergei²,

Lee³

et al. 2019

Fire Sci. Eng

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“…The encapsulation technique depends on the physical and chemical properties of the materials used. To date, there are several physical and chemical methods used for the production of nano or micro capsules [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, the common problem with these methods is that they all require a complex or time-consuming preparation process.…”

Section: Introductionmentioning

confidence: 98%

A simple sonochemical method for fabricating poly(methyl methacrylate)/stearic acid phase change energy storage nanocapsules

Wang

Hou

et al. 2015

Ultrasonics Sonochemistry

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In this study, stearic acid suitable for thermal energy storage applications was nanoencapsulated in a poly(methyl methacrylate) shell. The nanocapsules were prepared using a simple ultrasonically initiated in situ polymerization method. The morphology and particle size of the poly(methyl methacrylate)/stearic acid phase change energy storage nanocapsules (PMS-PCESNs) were analyzed using transmission electron microscopy, scanning electron microscopy, atomic force microscopy and dynamic light scattering. The latent heat storage capacities of stearic acid and the PMS-PCESNs were determined using differential scanning calorimetry. The chemical composition of the nanocapsules was characterized using Fourier transform infrared spectroscopy. All of the results show that the PMS-PCESNs were synthesized successfully and that the latent heat storage capacity and encapsulation efficiency were 155.6 J/g and 83.0%, respectively, and the diameter of each nanocapsule was 80-90 nm.

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“…However, these eco-friendly fire extinguishing agents are difficult to store and utilize due to the low vaporization temperature and high vapor pressure [ 4 , 5 , 6 ]. In order to overcome these disadvantages, methods of using an aerosol system [ 7 ] and encapsulating the fire extinguishing agent with a polymeric material have been proposed [ 8 , 9 , 10 , 11 , 12 , 13 ]. In particular, microencapsulation of fire extinguishing agents has been studied recently for the prevention and suppression of fire in lithium-ion batteries and similar energy storage systems.…”

Section: Introductionmentioning

confidence: 99%

Double-Layered Polymer Microcapsule Containing Non-Flammable Agent for Initial Fire Suppression

et al. 2022

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Fire in energy storage systems, such as lithium-ion batteries, has been raised as a serious concern due to the difficulty of suppressing it. Fluorine-based non-flammable agents used as internal substances leaked through the fine pores of the polymer outer shell, leading to a degradation of fire extinguishing performance. To improve the durability of the fire suppression microcapsules and the stability of the ouster shell, a complex coacervation was used, which could be microencapsulated at a lower temperature, and the polymer shell was coated with urea-formaldehyde (UF) resin. The outermost UF resin formed elaborate bonds with the gelatin-based shell, and thus, the structure of the outer shell became denser, thereby improving the loss resistance of the inner substance and thermal stability. The double-layered microcapsules had an average particle diameter of about 309 μm, and a stable outer shell formed with a mass loss of 0.005% during long-term storage for 100 days. This study confirmed that the double-layered microcapsules significantly improved thermal stability, resistance to core material loss, core material content and fire suppression performance compared to single wall microcapsules. These results indicated that the double-layered structure was suitable for the production of microcapsules for initial fire suppression, including highly volatile non-flammable agents with a low boiling point.

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Novel microencapsulated liquid fire extinguishers with a nanomodified microcapsule shell

Cited by 7 publications

References 10 publications

The Effect of Epoxy Resin on the Properties of Encapsulated Fire Extinguishing Agent

The Effect of Epoxy Resin on the Properties of Encapsulated Fire Extinguishing Agent

A simple sonochemical method for fabricating poly(methyl methacrylate)/stearic acid phase change energy storage nanocapsules

Double-Layered Polymer Microcapsule Containing Non-Flammable Agent for Initial Fire Suppression

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