The invention discloses a high-fill-power down preparation method. The method includes steps: washing raw down,
dewatering,
drying, and removing residual dust to obtain premade down; mixing humic acidand
potassium hydroxide solution, heating, stirring, adding
epoxidized soybean oil and
graphene, oscillating, adding sweet potato
protein powder, adjusting a
system pH value to 8.8-9.4, adding aminopropyl-terminated polycyanopropyl methyl
siloxane, continuing stirring, performing
microwave treatment, distilling for water removal, and performing
freeze drying to obtain a premade material; adding adetergent into the premade down, performing fine washing, rinsing with
clean water,
dewatering, adding the premade material and
chitosan, well mixing, impregnating, filtering, washing,
drying and cooling to obtain high-fill-power down. The high-fill-power down prepared according to the method is high in
fill power, low in damage, great in antibacterial function and low in dust content, the antibacterial performance of the high-fill-power down does not decline after repeated washing, and original elasticity and compression performance of the down can be recovered, so that
fill power of the down is guaranteed.