Compound fire extinction material used for coal mine, and preparation method thereof

Abstract

The invention provides a compound fire extinction material used for a coal mine. The fire extinction material is prepared from the following ingredients in parts by weight: 12-15% of sandy soil, 5-7%of vermiculite, 3.2-3.5% of pyrophyllite, 2.7-3.5% of bentonite, 1.7-2.0% of nano-silica, 1.2-1.5% of sodium carboxymethylcellulose, 0.5-0.6% of hydroxyethyl cellulose, 1.1-1.3% of silicate mixture, 0.6-0.7% of melamine cyanurate, 0.3-0.6% of phosphoric acid, 0.1-0.3% of sodium alginate, 0.1-0.3% of Tween-80, 0.1-0.3% of polyvinyl butyral, 0.1-0.2% of chitosan and the balance of water, wherein thetotal amount of above raw materials is 100%. According to the compound fire extinction material prepared with the preparation method, a multilayer structure can be formed on the surface of coal, in addition, the coal can be cooled in a targeted way so as to perform the efficacies on thermal insulation, oxygen insulation, smoke inhibition and the like, effects on efficiently resisting flame and quickly carrying out fire extinction are achieved, and the flame resistance of the material is greatly improved.

Description

technical field [0001] The invention relates to the technical field of fire extinguishing materials, in particular to a composite fire extinguishing material for coal mines and a preparation method thereof. Background technique [0002] Coal mines mined underground are generally subject to mining technology limitations, and there will be a lot of coal left in the goaf. Under the condition of suitable oxygen supply and heat storage environment, coal spontaneous combustion will occur after a period of time. Spontaneous combustion of coal underground in coal mines is one of the five major disasters in coal mines. my country is a large coal-producing country. At present, 50% of the coal mines are threatened by coal spontaneous combustion, and with the development of new lignite coal fields in the central and western regions of my country and the deep mining of old mines, the threat of coal spontaneous combustion becomes more serious. The basic principle of coal spontaneous comb...

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Problems solved by technology

Gas fire extinguishing agents such as haloalkane, carbon dioxide, and inert gas are expensive, and it is difficult to exert their fire extinguishing efficiency in open spaces; dry powder fire extinguishing agents have high fire extinguishing efficiency and fast fire extinguishing speed. However, dry powder fire extinguishing has little cooling effect on combustion. It has the function of covering and preventing combustion and evaporation. The surface of the coal pile is easy to cause re-ignition, and the interior of the coal pile basically does not play a role. The foam fire extinguishing agent has high fire extinguishing efficiency and fast fire extinguishing speed when applied to combustible liquid fires. However, it is low in efficiency when used to extinguish coal spontaneous combustion fires , large amount, uneconomical