Anti-refiring ultrafine ammonium phosphate dry chemical fire-extinguishing agent and its preparation method

Abstract

A superfine ammonium phosphate dry chemical fire-extinguishing agent for preventing refiring is prepared from ammonium phosphate, ammonium sulfate, talc powder, mica powder, white carbon black and calcium carbonate through airflow pulverizing, proportional mixing, coating silicon oil, and coating F-C surfactant.

Description

technical field [0001] The invention belongs to the field of ammonium phosphate dry powder fire extinguishing agent, in particular to an anti-recombustion superfine ammonium phosphate dry powder fire extinguishing agent and a preparation method thereof. Background technique [0002] The dry powder fire extinguishing agent prepared with ammonium phosphate as the main body is environmentally friendly, has a wide fire extinguishing range, fast fire extinguishing rate, and high fire extinguishing efficiency. It is one of the best substitutes for Halon fire extinguishing agent. The dry powder fire extinguishing agent prepared by superfine ammonium phosphate salt has large specific surface area, high surface activity, and much higher fire extinguishing efficiency than ordinary type. It is the development direction of ammonium phosphate dry powder fire extinguishing agent at home and abroad. [0003] People such as Zhang Wei once adopted the aqueous ph...

AI Technical Summary

Problems solved by technology

Although this method is simple in process flow and easy to industrialize, it has the following deficiencies: 1. The dry powder fire extinguishing agent can have good moisture-proof and anti-corrosion properties after silicification treatment, but when extinguishing oil fires, once the dry powder particles are sprayed on the oil surface In general, due to the strong lipophilicity of the hydrophobic film on the surface of the particles, the dry powder particles quickly sink into the oil and cannot protect the oil surface, and because the cooling effect of the dry powder fire extinguishing agent is very small, the remaining small flames will be burned again. Ignite the entire oil surface, so there is a "re-ignition" problem in extinguishing oil fires

2. Due to the low temperature of the silicone oil coating on the surface and the short reaction time, it is not conducive to the full volatilization of water in the powder, and affects the water repellency, fluidity, storage and sprayability of the product

[0005] Wu Yilun from the Tianjin Fire Research Institute of the Ministry of Public Security introduced the methods of anti-resurgence and anti-resurgence in the process of dry powder fire extinguishing in the article "General Principles of Dry Powder Fire Extinguishing Agents" (see "Fire Technology and Product Information", 2000 (2) P23-24). One of the approaches for the preparation of dry powder is to add fluorocarbons to the dry powder to make the dry powder oil-repellent, but the preparation process of the specific fluorocarbon surfactant used in the disclosed dry powder treatment process is complicated, and the preparation process is in the dry powder The surface is first coated with fluorocarbon film, and then coated with silicone oil film, the dry powder fire extinguishing agent obtained in this way has poor reburning resistance