Aqueous fire extinguishing agent and preparation method thereof

A preparation method of an aqueous fire extinguishing agent, the aqueous fire extinguishing agent comprising:

• a composition A and a composition B;
• wherein the composition A is a fortified water added with a flame retardant, a wetting agent and a colloid, and the composition B is a regulator;
• wherein the flame retardant of the composition A is one or more selected from the group consisting of carbonamide (CH4N2O), ammonium chloride (NH4Cl), diammonium hydrogen phosphate ((NH4)2HPO4) and ammonium polyphosphate ((NH4)n+2PnO3n+1), the wetting agent is APG0810, and the colloid is a polyacrylamide (PAM) solution;
• wherein the composition B is a sodium hydroxide (NaOH) solution;
• and
• wherein a working fluid for fire extinguishing is a mixture of the composition A and the composition B.
• wherein the preparation method of the aqueous fire extinguishing agent comprises:
• step (1), preparing a composition A:
• injecting 1000 milliliters (ml) of deionized water into a preparation vessel, placing the preparation vessel into a water bath device, keeping a water temperature at 20˜40° C., adding 0˜1000 g of the carbonamide (CH4N2O), 0˜410 g of ammonium chloride (NH4Cl), 0˜720 g of the diammonium hydrogen phosphate ((NH4)2HPO4) and 0˜200 g of the ammonium polyphosphate ((NH4)n+2PnO3n+1) into the preparation vessel under stirring then adding 0.1˜10 ml of the APG0810 with a solid content no less than 50% and 0.1˜100 ml of polyacrylamide (PAM) solution with a concentration of 1˜5‰, continuing to inject deionized water until a volume of an aqueous solution in the preparation vessel is up to 2000 ml, stirring the aqueous solution for complete dissolution, and a pH value of the aqueous solution being in a range of 7.0˜7.5;
• step (2), preparing the composition B:
• preparing a sodium hydroxide solution with a concentration of 0.1˜55%;
• step (3), performing a titration test:
• taking a part of the composition A prepared by the step (1) and using the composition B prepared by the step (2) for titration, completing the titration test when a pH value of a working fluid mixed with the composition B and the composition A being 9.0 and recording a dosage ratio of the composition A and the composition B;
• and
• step (4), filling the aqueous fire extinguishing agent:
• injecting the composition A first and then injecting the composition B and sealing to obtain a working fluid with the mixture of the composition A and the composition B, according to the dosage ratio of the composition A and the composition B obtained in the step (3);
• or, obtaining the working fluid by mixing the composition A and the composition B through a device in a fire extinguisher when the fire extinguisher being in use.