Abstract: In order to study the influence of 3 process parameters including material ratio, mixing speed and mixing time on the preparation process and product properties of dry water fire extinguishing agent prepared by high-speed shear method, 17 groups of comparative experiments were designed according to the response surface analysis method, and the performance parameters such as bulk density, fluidity, moisture content, and water retention of the dry water products prepared under different preparation parameters were measured.The experimental results showed that the of material ratio, the stirring rate, and the stirring time have significant effects on the bulk density, fluidity, moisture content, and water retention of the product powder, and have strong interactions. By regression fitting the experimental data, the function model between the performance parameters and process parameters was established, and the optimal preparation parameters are obtained as follows: the material ratio is 6:100, the stirring speed is 6 000 r/min, and the stirring time is 2 min.

Key words: firefighting, dry water, fire extinguishing agent, response surface analysis