Preparation method of polyurethane bandage with functions of sterilization and itch relief and bandage manufactured by method

Abstract

The invention discloses a preparation method of a medical polyurethane bandage with the functions of sterilization and itch relief. The preparation method comprises the following steps of firstly preparing a polyurethane prepolymer and chitosan microspheres or chitosan quaternary ammonium salt with the functions of sterilization and itch relief, then uniformly coating the polyurethane prepolymer on base cloth, and coating chitosan microspheres or chitosan quaternary ammonium salt on the base cloth coated with the polyurethane prepolymer under the guiding of a guide drum. The bandage prepared by the method comprises a base material, the polyurethane prepolymer coated on the base material and the chitosan microspheres or chitosan quaternary ammonium salt with the functions of sterilization and itch relief, and therefore, compared with conventional immovable bandages, the bandage prepared by the method has the advantages of good shaping property, high strength, light weight, low cost and aesthetic property and can be used for effectively killing bacteria on the surfaces of skins so as to prevent the skins from swelling and itching and providing a dry comfortable environment for patients.

Description

technical field [0001] The invention relates to the technical field of medical and sanitary products, in particular to a method for preparing a water chain-extended medical polyurethane bandage with the function of sterilizing and relieving itching, and the bandage prepared by the method. Background technique [0002] In the early 1980s, Bayer first proposed coating polyurethane prepolymers on mesh fabrics to make bandages, which was a major development in the field of orthopedic treatment. The method of using this bandage is to contact the bandage with water at room temperature first, and then wrap it around the affected part of the patient. The polyurethane prepolymer coated on the base cloth will react with water and gradually harden from the initially soft plastic bandage. Finally, a rigid material is formed to fix the patient's affected part. At this time, the bandage has a high strength and its shape cannot be changed. Because the bandage has the advantages of light w...

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Problems solved by technology

[0003] However, in practical applications, we found that polyurethane bandage products at home and abroad can easily cause skin redness, swelling, itching and other allergic phenomena. Since polyurethane bandages generally use 5-8 layers, although the air permeability is better than that of tight plaster bandages, it is not suitable for use in hot summer. Or for those with sensitive skin, the patient's skin will have itching, redness and swelling due to insufficient ventilation of the bandage; moreover, the raw materials of the existing polyurethane bandage are expensive, and the production cost is relatively high