Composite dry powder extinguishing agent and preparation method therefor

Abstract

The invention discloses a gas-solid composite dry powder extinguishing agent and a preparation method therefor. The method is characterized by the steps as follows: dissolving urea in an ethanol-water mixed solution with a volume ratio of ethanol to water being 1:2-5, the concentration of magnesium ion being 0.2-1.2 mol/L and the molar ratio of the urea to the magnesium ion being 2-6:1; heating the mixed solution at 90-120 DEG C for 8-12 hours to obtain a white precipitate of magnesium hydroxide; filtering the solution; washing the white precipitate; drying the white precipitate at 120 DEG C for 6-12 hours; placing the dried magnesium hydroxide precipitate into a pressure-resistant container; vacuumizing the container; filling the pressure-resistant container with 2-bromo-3,3,3-trifluoropropene (BTP) liquid, wherein the mass of the 2-bromo-3,3,3-trifluoropropene accounts for 5.0-16% of the mass of the system; allowing the system to stand at 35-50 DEG C for 12-24 hours; cooling the system to room temperature; adding talcum powder to the container with the mass of the talcum powder accounting for 1.0-4.0% of the mass of the system; mixing the powder uniformly to obtain the gas-solid composite dry powder extinguishing agent. The extinguishing agent is low in corrosivity and good in anti-reburn performance. The raw materials of the extinguishing agent are cheap and easy to obtain and the preparation process is simple. The extinguishing agent is suitable for various fire hazards such as solid fires, combustible gas fires and liquid fires or the like.

Description

【Technical field】 [0001] The invention belongs to the technical field of powder-based fire extinguishing agents, in particular to a gas-solid composite fire extinguishing agent and a preparation method thereof. 【Background technique】 [0002] Commonly used dry powder fire extinguishing agents, such as sodium bicarbonate, ammonium dihydrogen phosphate and other fire extinguishing powders, have a wide range of fire extinguishing, are environmentally friendly, non-toxic to the human body, and have a wide range of operating temperatures. Compared with water, foam and carbon dioxide and other fire extinguishing agents , has obvious advantages in three aspects of fire extinguishing rate, fire extinguishing area and fire extinguishing cost. At present, it is widely used in portable and fixed fire extinguishing systems. However, traditional powder fire extinguishing agents also have various deficiencies: (1) factors such as large size, fast settling speed, and slow thermal decompos...

AI Technical Summary

Problems solved by technology

However, traditional powder fire extinguishing agents also have various deficiencies: (1) factors such as large size, fast settling speed, and slow thermal decomposition speed lead to low efficiency in capturing free radicals or active groups, and limited fire extinguishing ability (2) The decomposition products of some fire extinguishing agents (such as sodium bicarbonate) also have certain corrosiveness

(3) The silicone oil hydrophobic film on the surface of ordinary dry powder particles has strong lipophilicity. When fighting an oil fire, it is easy to sink into the oil and has poor reburning resistance.

These deficiencies have all restricted the practical application range of powder fire extinguishing agent to a certain extent.