▎ 摘　　要

NOVELTY - A - 28 degrees C phase change coolant comprises 10-15 wt.% potassium chloride, 5-10 wt.% sodium chloride, 8-15 wt.% ammonium chloride, 0.2-1 wt.% sodium carboxymethyl cellulose, 0.1-1.5 wt.% nano-scale metal material composite A and balance deionized water. USE - - 28 degrees C Phase change coolant. ADVANTAGE - The coolant is safe, non-toxic and low-cost, and meets freezing needs of frozen medicines, meat and seafood. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the - 28 degrees C phase change coolant comprising weighing deionized water by container, continuously stirring at speed of 1000 revolutions/minute (rpm), firstly adding nano-scale metal material compound A, continuously adding potassium chloride, sodium chloride and ammonium chloride, fully dissolving, setting speed to 3500 rpm, adding sodium carboxymethyl cellulose, continuously stirring to fully swell odium carboxymethyl cellulose, and keeping stirring for 1 hour.