MICROCAPSULATED FIRE EXTINGUISHING AGENT, METHOD FOR ITS PRODUCTION AND FIRE EXTINGUISHING PRODUCT CONTAINING SUCH AGENT Russian patent published in 2023 - IPC A62D1/00 

FIELD: fire-extinguishing products.

SUBSTANCE: group of inventions relates to fire extinguishing agents that operate in automatic mode, when they are directly exposed to fire, and can be used as an integral part of fire-extinguishing composite materials in the form of various fire-extinguishing products - plates, cords, paints, capes, used to extinguish various fires and protect subjects like electrical sockets, cables, transformer cabinets, lithium-ion batteries. The microencapsulated extinguishing agent contains microcapsules with a core of perfluoroethyl-perfluoroisopropyl ketone fire extinguishing liquid. The core is placed inside a spherical polymer shell of cross-linked gelatine. The polymer shell contains a curing complex of a mixture of alum and resorcinol-urea-formaldehyde resin. Upon receipt of a microencapsulated fire extinguishing agent, a gelatine solution is prepared, the perfluoroethyl-perfluoroisopropyl ketone fire extinguishing liquid to be placed in the core of the microcapsule is dispersed in the gelatine solution. A liquid shell is formed on the drops of the resulting emulsion by adding a solution of sodium hexametaphosphate or a solution of sodium sulphate. The liquid shell is gelled by cooling the suspension to 10°C. The gelled shell is pre-cured with glutaraldehyde and the shell is additionally cured with a mixture of alum and resorcinol-urea-formaldehyde resin. The resulting microcapsules are washed and dried. Mass loss of microcapsules with extinguishing liquid during cyclic temperature control in the range from -40°C to +40°C is less than 2% by weight. The fire-extinguishing product contains a microencapsulated fire-extinguishing agent and is made in the form of a structural product: in the form of a plate, a cord, a blanket, a mastic, a coating, a film, a technical fabric.

EFFECT: obtaining microcapsules with high stability under storage and use conditions, including under conditions of variable temperatures from -40°С to +40°С, as well as preservation of the environment due to reduction and even absence of a toxic substance - formaldehyde in the working area in the air and in waste waters.

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