Abstract: Based on the study of the caking reason and anti-caking measures of ADP, stearic acid (SA) was used as moisture-proof agent, water and water / anhydrous ethanol mixed solution were used as moisture-proof agent solvent respectively, and solvent evaporation method was used to modify ADP to reduce its hygroscopicity and achieve the purpose of anti-caking. The influence of process conditions such as solvent evaporation temperature, stirring speed, moisture-proofing agent content, solvent type, and solvent addition volume on the particle size of ADP composites was studied. ADP composites under different process conditions were prepared, and their particle size and moisture absorption were tested. The results show that when the SA content is 3%, the mixed solution of 15 mL water and 15 mL absolute ethanol is used as the solvent, the evaporation temperature is 90 ℃, and the stirring speed is 400 r/min, the moisture-proof effect of the ADP composite is the best: the particle size is 50 μm, the moisture absorption rate is reduced from 2.79% to 0.92%, and then the theoretical analysis is carried out.

Key words: ADP, SA, moisture-proof modification, particle size, hygroscopicity