METHOD FOR PRODUCING AN OPEN-CELL POLYMER MATERIAL Russian patent published in 2022 - IPC C08J9/00 B01D71/26 

FIELD: polymers.

SUBSTANCE: invention relates to the chemistry and technology of polymers, in particular, to the technology for producing open-cell polymer materials, usable in the production of films, filters, membranes, sorbents, and other gas- and liquid-permeable and heat-insulating products; accumulator battery separators, matrices for producing nanocomposites, polymer-polymer mixtures, etc. The problem herein is solved by the method for producing an open-cell polymer material including the stages of preparing a polymer solution, adding a template, removing the solvent, shaping the material, and removing the template. A polymer, wherein high-density polyethylene is used as a polymer, a solvent, wherein toluene is used as a solvent, and a template, wherein paraffin is used as a template, are therein mixed at a mass ratio of polyethylene:toluene equal to 1:29 and polyethylene:paraffin equal to 1:2-58, at a temperature of 70 to 110°C, stirring intensively at 400 to 600 rpm until a homogeneous solution is formed, heated to a temperature of 110°C, and toluene is distilled to a temperature of the solution of 95°C, then the material is shaped by casting in layers with a thickness of 4 to 40 mm into moulds until solidification for 2.5 to 3 minutes at a temperature of 40 to 43°C, the polymer material is extracted from the moulds, the residual toluene is removed by natural drying or evacuation, then paraffin is removed by extraction with methylene chloride, wherein for a material with a mass ratio of polyethylene:paraffin of 1:2 to 10, paraffin is removed by extraction with methylene chloride for 10 to 12 hours, and for a material with a mass ratio of polyethylene:paraffin greater than 1:10, paraffin is removed by extraction with methylene chloride for 15 to 17 hours, then the residual methylene chloride is removed by natural drying or evacuation.

EFFECT: reduced labour intensity of manufacture, simplicity of instrumentation, and production of a material with a given porosity; macroporous with possible mesoporosity (according to the IUPAC classification), both with cells of 100 to 300 nm in size and groups of cavities less than 70 nm with the presence of polyethylene filaments (SEM-based), with high values of edge angles relative to water, permeable for non-polar organic compounds and partially water-permeable.

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