The invention provides a medical
mask and a preparation method thereof, belonging to the technical field of protective materials. According to the invention, a bio-based composite
fiber melt-blown layer is arranged in the
mask, and the average
pore diameter of the bio-based composite
fiber melt-blown layer is set to be 1.5-2.5 microns and is the same as the
pore diameter of a
polypropylene melt-blown non-
woven fabric layer, so filtering of tiny particles is guaranteed, and meanwhile,
breathing difficulty of a wearer due to the fact that the
pore diameter is too small is avoided. More importantly, hydroxyl groups rich in the bio-based composite
fiber melt-blown layer can realize
hydrogen-bond bonding with water molecules in an environment under the condition of
high humidity, so the water molecules are fixed to participate in triboelectrification. Due to the fact that the electropositivity of water molecules is extremely high, the overall electric quantity of the bio-based composite fiber melt-blown layer is increased, so the
electrostatic adsorption capacity of the bio-based composite fiber melt-blown layer is improved; and the larger the
humidity of the environment is, the largerthe amount of
water vapor exhaled by the
human body is, the larger the overall electric quantity of the
mask middle layer is, and the higher the adsorption capacity is. The mask provided by the invention can be well applied to a high-
humidity environment.