Preparation method of a flexible hydrogel and its application in high-performance medical protective equipment

Abstract

The invention belongs to the technical field of medical protection, and specifically relates to a preparation method of a flexible hydrogel and its application in high-performance medical protective equipment. The invention uses diol monomers, diisocyanate monomers and other raw materials to prepare hydrogels with constant cations. Charged polyurethane polymer PU‑1(+) and water-soluble polyurethane material PU‑2(‑) modified with negatively charged carboxylic acid, and then use the positive and negative charges of PU‑1(+) and PU‑2(‑) A flexible hydrogel was prepared by mutual attraction. The flexible hydrogel can be prepared as a hydrogel inner fitting layer on the edge of the inner layer of the mask body, because the inner fitting layer of the hydrogel has good adhesion to the skin and the mask fabric, and is compatible with the elastic mold of the skin. The amount is similar and has good biocompatibility, so it can fit closely with the facial skin and enhance the overall protective effect of the mask. At the same time, it can effectively reduce the pain caused by the edge fixing strip tightening the face and causing the face to be stressed.

Description

technical field [0001] The invention belongs to the technical field of medical protection, and in particular relates to a preparation method of a flexible hydrogel and its application in high-performance medical protection equipment. Background technique [0002] Masks are an important protective tool in epidemic prevention work. Ideally, the mask can fit closely with the face, and the multi-layer structure of the medical mask can effectively filter the fine droplets or solid particles that carry pathogenic bacteria suspended in the air. However, affected by the difference in elastic modulus between the mask and the skin and the complex three-dimensional contour of the face, the pressure and deformation of the facial skin are not uniformly distributed in the actual use of the mask, resulting in the mask and the face not being able to fit closely. . At the same time, affected by the differences in individual facial morphology, there is a common gap between the mask and the ...

AI Technical Summary

Problems solved by technology

[0003] Mask leakage and facial friction damage are mainly due to the following reasons: (1) The elastic modulus of the mask and the skin does not match; the elastic modulus of the mask fabric is greater than that of the skin tissue (the elastic modulus E of the non-woven fabric and the skin tissue are respectively 27.7MPa and 0.42-0.85MPa), the resulting elastic modulus does not match, and when the mask-skin is relatively sliding, it is easy to cause friction damage to the facial skin; (2) the spatial pressure distribution of the facial skin is uneven; Studies have shown that when wearing an N95 medical mask, the contact pressure at the bridge of the nose is the largest (up to 0.11MPa), and the deformation in the middle of the cheek is the largest (up to 0.93mm); the bridge of the nose where the pressure is the highest is also the most severely worn area when wearing the mask; ( 3) The fit is not tight in the exercise state; when the mask is worn, the elastic bandage only provides pressure for the fit between the mask and the face, but the non-woven material of the inner layer of the mask has no adhesion to the skin; medical staff need frequent Communicate accurately with patients or colleagues; due to elastic modulus mismatch and uneven pressure distribution, frequent relative movements of "mask-skin" caused by facial muscle activities will cause frictional injuries at the bridge of the nose and cheeks of medical staff

Therefore, in order to eliminate the problem of poor sealing of the mask due to the formation of gaps after wearing it and the discomfort of the facial skin caused by wearing it for a long time, it is necessary to design a new type of mask with good sealing performance and less oppression on the facial skin.

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