Medical mask and application thereof

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of protective materials, in particular to a medical mask and its application. Background technique [0002] Traditional medical masks are mainly divided into two types according to the protection level: medical surgical masks and medical protection. Although these two masks are quite different in appearance design, they are similar in composition, that is, they are generally made of spunbond outer layer. It consists of three layers of non-woven fabric, melt-blown non-woven fabric in the middle layer and spun-bonded non-woven fabric in the inner layer. The fiber diameter of spunbond nonwoven fabric is relatively thick, generally around 20 microns. The main function of the inner and outer layers of spunbond nonwoven fabric is to support the structure of the entire nonwoven fabric, and the barrier effect is small; the middle layer is called the barrier layer or The melt-blown layer is the most important part o...

AI Technical Summary

Problems solved by technology

When the ambient humidity is relatively low, medical masks can play a good role in adsorption after being rubbed or charged by other methods. In severe weather such as snow, fog, etc., the polypropylene in the middle layer is very easy to accelerate the dissipation of static electricity due to the increase in humidity (L. Gu, et, al. Packaged triboelectric nanogenerator with high edurability for severe environments, Nanoscale.2015, 7 ,18049), thereby reducing the electrostatic adsorption capacity of the polypropylene melt-blown layer and increasing the risk of bacterial and viral infection

[0004] Despite this shortcoming of traditional medical masks, there are few studies on how to improve the electrostatic adsorption capacity of medical masks in high-humidity environments (such as the accumulation of water vapor in the mask caused by human exhalation).

Images