FIELD: fire-extinguishing devices.
SUBSTANCE: group of inventions relates to modern innovative means of preventing and extinguishing fires at various objects of industry and national economy, namely, to a thermally activated self-actuating granular fire extinguishing agent of the combined gas-aerosol principle of action, a method for producing granules and fire extinguishing compositions, products, generators, devices, installations and fire extinguishers based on such granules. The fire-extinguishing granule of the combined principle of action contains microcapsules with a core of a fire-extinguishing substance located inside a shell made of a cured spatially cross-linked polymer material. The microcapsules are placed in a protective-activating shell with an aerosol-generating composition at the following ratio of components, wt.%: microcapsules 30-40, aerosol-generating composition 50-60, protective-activating shell 10-20. The granule has the ability of explosive destruction in the range of 150-350°C. The external diameter of the granule is in the range from 500 to 1500 mcm. To obtain a fire-extinguishing granule, an aerosol-generating composition is prepared. Dried at a temperature of 60-80°C the oxidizer is crushed for at least 24 hours at 30-50 rpm and at a pressure of 3-5 kg/cm2. The resulting fine suspension of the oxidizer is sieved, loaded into the reactor with a flow rate of 2-3 kg/min at a speed of rotation of the reactor blades of 50-60 rpm. At the same time, a cementator solution consisting of a mixture of 50-60% solvent and 40-50% membrane-forming agent is sprayed into the reactor. As the mixture thickens, the mixing speed is lowered to 20-30 rpm. The resulting solution is fed with microcapsules of 1-2 kg per minute. The resulting raw material is mixed and the speed is reduced to 3-5 rpm. From the formed raw material at a pressure of 2.0-3.0 atm, a preform of granules of a given diameter and length is squeezed out. The resulting granule preforms are dried, cut into the specified sizes and sprayed with a protective-activating shell - layer with a mixture of 40-50% solvent and 50-60% membrane-forming agent. The finished granules are dried for at least 24 hours at a temperature of 30-50°C. A fire-extinguishing product containing fire-extinguishing granules is made in the form of a fire-extinguishing cord, the braid of which contains a sealed briquette with a fire-extinguishing granule of the combined principle of action, or in the form of a fire-extinguishing generator consisting of a heat-resistant case, in which a sealed briquette with a fire-extinguishing granule of the combined principle of action and an orienting spray are placed, or in the form of a fire extinguisher consisting of a heat-resistant case, in which a sealed briquette with a fire-extinguishing granule of the combined principle of action is placed, orienting sprayer and activator.
EFFECT: invention provides an increase in the efficiency of fire extinguishing of fire sources in the protected volumes at earlier stages, maintaining the product's operability in conditions of high humidity.
12 cl, 8 dwg, 5 tbl
