Polyurethane/China hemp fiber moisture-absorbing breathable film

Fecha de publicación: 05/01/2021
Fuente: WIPO "hemp"
The invention relates to a polyurethane/China hemp fiber moisture-absorbing breathable film which is prepared by mixing the following components in parts by mass: 10-25 parts of polyurethane/China hemp fiber, comprising 0.2-1.0 part of China hemp fiber; and 75-90 parts of N, N-dimethylformamide. The preparation method comprises the following steps of: adding polyurethane, N, N-dimethylformamide and hemp fibers into a clean and dry three-necked bottle, and continuously stirring in a water bath at 60 DEG C until the materials are completely dissolved to obtain a film casting solution; after vacuum defoaming, scraping a casting solution with uniform thickness on a dry and clean glass plate, and immediately immersing the glass plate into deionized water; and after the casting solution is subjected to split-phase film forming, cleaning a solvent on the surface of the prepared film with clear water, soaking the film in a glycerol solution for a period of time, and then taking out and naturally airing the film. The moisture-absorbing breathable film has excellent combination characteristics, namely relatively high water flux and breathability and relatively good mechanical properties. Thepreparation process disclosed by the invention is relatively simple in production process and easy in production and implementation.