Composite powder fire extinguishing agent and preparation method thereof

Abstract

The invention discloses a composite powder base fire extinguishing agent and a preparation method thereof, which are characterized in that the vacuum pumping is carried out on 85 to 95 percent of layer double hydroxide with the grain diameter lower than 10mum according to the mass percent of the system to a value lower than 0.01 MPa in a pressure-resistant container, 2-bromine-3, 3, 3-trifluoropropene liquid is filled for soaking the powder, and the materials are stirred for more than 12 hours at a speed of 300 to 600r / min at -5 to 10 DEG C; then, the powder is separated through extraction filtering and is placed for 6 to 10 hours at room temperature, then, 0.8 to 2.2 percent of magnesium stearate with the grain diameter lower than 10mum according to the mass percent of the system is added and is uniformly mixed; the obtained composite powder fire extinguishing agent simultaneously has hydrophobicity and lipophobicity, the moisture-proof performance and the anti-reignition performance are good, the fire extinguishing efficiency is high, the composite powder fire extinguishing agent can be used as the fire extinguishing agent and can also be used as additives of powder extinguishing agents, raw materials have low price and can be easily obtained, the preparation process is simple, and the composite powder fire extinguishing agent is suitable for being used for various fire extinguishers to extinguish various kinds of fire hazards.

Description

technical field [0001] The invention belongs to the technical field of powder fire extinguishing agents, in particular to a composite dry powder fire extinguishing agent and a preparation method thereof. Background technique [0002] Common fire extinguishing agents include gas, dry powder, water and foam. Among these many types of fire extinguishing agents, dry powder fire extinguishing agents have been widely used to fight solid, liquid, flammable gases and other types due to their high fire extinguishing efficiency, safety to the environment and human body, easy storage, and low price. fire, occupies an important position in the field of fire extinguishing agents today. However, the main components of existing common dry powder fire extinguishing agents are usually inorganic salts such as sodium bicarbonate, ammonium dihydrogen phosphate and sodium chloride, which are easy to absorb moisture and agglomerate when placed for a long time, seriously affecting its fire exting...

AI Technical Summary

Problems solved by technology

However, the main components of existing common dry powder fire extinguishing agents are usually inorganic salts such as sodium bicarbonate, ammonium dihydrogen phosphate and sodium chloride, which are easy to absorb moisture and agglomerate when placed for a long time, seriously affecting its fire extinguishing performance; in order to improve its moisture-proof performance, now Most of the dry powder fire extinguishing agents are treated with surface siliconization, that is, a layer of silicone oil hydrophobic film is coated on the surface. However, due to the strong lipophilicity of this silicone oil hydrophobic film, when fighting oil fires, the particles are easy to sink into the oil. Poor resistance to reflammation

In addition, due to the large particle size (generally 10-75 microns), the traditional powder fire extinguishing agent has a fast settling speed and a slow thermal decomposition speed, resulting in low efficiency in capturing free radicals or active groups, and limited fire extinguishing ability; This restricts the practical application scope of powder fire extinguishing agent to a certain extent